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   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25
  26 *******************************************************************************/
  27
  28 #include <linux/types.h>
  29 #include <linux/module.h>
  30 #include <linux/pci.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/string.h>
  34 #include <linux/in.h>
  35 #include <linux/ip.h>
  36 #include <linux/tcp.h>
  37 #include <linux/ipv6.h>
  38 #include <net/checksum.h>
  39 #include <net/ip6_checksum.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/if_vlan.h>
  42
  43 #include "ixgbe.h"
  44 #include "ixgbe_common.h"
  45
  46 char ixgbe_driver_name[] = "ixgbe";
  47 static const char ixgbe_driver_string[] =
  48                               "Intel(R) 10 Gigabit PCI Express Network Driver";
  49
  50 #define DRV_VERSION "1.3.30-k2"
  51 const char ixgbe_driver_version[] = DRV_VERSION;
  52 static char ixgbe_copyright[] = "Copyright (c) 1999-2007 Intel Corporation.";
  53
  54 static const struct ixgbe_info *ixgbe_info_tbl[] = {
  55         [board_82598] = &ixgbe_82598_info,
  56 };
  57
  58 /* ixgbe_pci_tbl - PCI Device ID Table
  59  *
  60  * Wildcard entries (PCI_ANY_ID) should come last
  61  * Last entry must be all 0s
  62  *
  63  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  64  *   Class, Class Mask, private data (not used) }
  65  */
  66 static struct pci_device_id ixgbe_pci_tbl[] = {
  67         {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82598AF_DUAL_PORT),
  68          board_82598 },
  69         {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82598AF_SINGLE_PORT),
  70          board_82598 },
  71         {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82598EB_CX4),
  72          board_82598 },
  73         {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82598_CX4_DUAL_PORT),
  74          board_82598 },
  75         {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82598EB_XF_LR),
  76          board_82598 },
  77
  78         /* required last entry */
  79         {0, }
  80 };
  81 MODULE_DEVICE_TABLE(pci, ixgbe_pci_tbl);
  82
  83 #ifdef CONFIG_IXGBE_DCA
  84 static int ixgbe_notify_dca(struct notifier_block *, unsigned long event,
  85                             void *p);
  86 static struct notifier_block dca_notifier = {
  87         .notifier_call = ixgbe_notify_dca,
  88         .next          = NULL,
  89         .priority      = 0
  90 };
  91 #endif
  92
  93 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
  94 MODULE_DESCRIPTION("Intel(R) 10 Gigabit PCI Express Network Driver");
  95 MODULE_LICENSE("GPL");
  96 MODULE_VERSION(DRV_VERSION);
  97
  98 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
  99
 100 static void ixgbe_release_hw_control(struct ixgbe_adapter *adapter)
 101 {
 102         u32 ctrl_ext;
 103
 104         /* Let firmware take over control of h/w */
 105         ctrl_ext = IXGBE_READ_REG(&adapter->hw, IXGBE_CTRL_EXT);
 106         IXGBE_WRITE_REG(&adapter->hw, IXGBE_CTRL_EXT,
 107                         ctrl_ext & ~IXGBE_CTRL_EXT_DRV_LOAD);
 108 }
 109
 110 static void ixgbe_get_hw_control(struct ixgbe_adapter *adapter)
 111 {
 112         u32 ctrl_ext;
 113
 114         /* Let firmware know the driver has taken over */
 115         ctrl_ext = IXGBE_READ_REG(&adapter->hw, IXGBE_CTRL_EXT);
 116         IXGBE_WRITE_REG(&adapter->hw, IXGBE_CTRL_EXT,
 117                         ctrl_ext | IXGBE_CTRL_EXT_DRV_LOAD);
 118 }
 119
 120 static void ixgbe_set_ivar(struct ixgbe_adapter *adapter, u16 int_alloc_entry,
 121                            u8 msix_vector)
 122 {
 123         u32 ivar, index;
 124
 125         msix_vector |= IXGBE_IVAR_ALLOC_VAL;
 126         index = (int_alloc_entry >> 2) & 0x1F;
 127         ivar = IXGBE_READ_REG(&adapter->hw, IXGBE_IVAR(index));
 128         ivar &= ~(0xFF << (8 * (int_alloc_entry & 0x3)));
 129         ivar |= (msix_vector << (8 * (int_alloc_entry & 0x3)));
 130         IXGBE_WRITE_REG(&adapter->hw, IXGBE_IVAR(index), ivar);
 131 }
 132
 133 static void ixgbe_unmap_and_free_tx_resource(struct ixgbe_adapter *adapter,
 134                                              struct ixgbe_tx_buffer
 135                                              *tx_buffer_info)
 136 {
 137         if (tx_buffer_info->dma) {
 138                 pci_unmap_page(adapter->pdev, tx_buffer_info->dma,
 139                                tx_buffer_info->length, PCI_DMA_TODEVICE);
 140                 tx_buffer_info->dma = 0;
 141         }
 142         if (tx_buffer_info->skb) {
 143                 dev_kfree_skb_any(tx_buffer_info->skb);
 144                 tx_buffer_info->skb = NULL;
 145         }
 146         /* tx_buffer_info must be completely set up in the transmit path */
 147 }
 148
 149 static inline bool ixgbe_check_tx_hang(struct ixgbe_adapter *adapter,
 150                                        struct ixgbe_ring *tx_ring,
 151                                        unsigned int eop)
 152 {
 153         struct ixgbe_hw *hw = &adapter->hw;
 154         u32 head, tail;
 155
 156         /* Detect a transmit hang in hardware, this serializes the
 157          * check with the clearing of time_stamp and movement of eop */
 158         head = IXGBE_READ_REG(hw, tx_ring->head);
 159         tail = IXGBE_READ_REG(hw, tx_ring->tail);
 160         adapter->detect_tx_hung = false;
 161         if ((head != tail) &&
 162             tx_ring->tx_buffer_info[eop].time_stamp &&
 163             time_after(jiffies, tx_ring->tx_buffer_info[eop].time_stamp + HZ) &&
 164             !(IXGBE_READ_REG(&adapter->hw, IXGBE_TFCS) & IXGBE_TFCS_TXOFF)) {
 165                 /* detected Tx unit hang */
 166                 union ixgbe_adv_tx_desc *tx_desc;
 167                 tx_desc = IXGBE_TX_DESC_ADV(*tx_ring, eop);
 168                 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
 169                         "  Tx Queue             <%d>\n"
 170                         "  TDH, TDT             <%x>, <%x>\n"
 171                         "  next_to_use          <%x>\n"
 172                         "  next_to_clean        <%x>\n"
 173                         "tx_buffer_info[next_to_clean]\n"
 174                         "  time_stamp           <%lx>\n"
 175                         "  jiffies              <%lx>\n",
 176                         tx_ring->queue_index,
 177                         head, tail,
 178                         tx_ring->next_to_use, eop,
 179                         tx_ring->tx_buffer_info[eop].time_stamp, jiffies);
 180                 return true;
 181         }
 182
 183         return false;
 184 }
 185
 186 #define IXGBE_MAX_TXD_PWR       14
 187 #define IXGBE_MAX_DATA_PER_TXD  (1 << IXGBE_MAX_TXD_PWR)
 188
 189 /* Tx Descriptors needed, worst case */
 190 #define TXD_USE_COUNT(S) (((S) >> IXGBE_MAX_TXD_PWR) + \
 191                          (((S) & (IXGBE_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
 192 #define DESC_NEEDED (TXD_USE_COUNT(IXGBE_MAX_DATA_PER_TXD) /* skb->data */ + \
 193         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1) /* for context */
 194
 195 #define GET_TX_HEAD_FROM_RING(ring) (\
 196         *(volatile u32 *) \
 197         ((union ixgbe_adv_tx_desc *)(ring)->desc + (ring)->count))
 198 static void ixgbe_tx_timeout(struct net_device *netdev);
 199
 200 /**
 201  * ixgbe_clean_tx_irq - Reclaim resources after transmit completes
 202  * @adapter: board private structure
 203  * @tx_ring: tx ring to clean
 204  **/
 205 static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter,
 206                                struct ixgbe_ring *tx_ring)
 207 {
 208         union ixgbe_adv_tx_desc *tx_desc;
 209         struct ixgbe_tx_buffer *tx_buffer_info;
 210         struct net_device *netdev = adapter->netdev;
 211         struct sk_buff *skb;
 212         unsigned int i;
 213         u32 head, oldhead;
 214         unsigned int count = 0;
 215         unsigned int total_bytes = 0, total_packets = 0;
 216
 217         rmb();
 218         head = GET_TX_HEAD_FROM_RING(tx_ring);
 219         head = le32_to_cpu(head);
 220         i = tx_ring->next_to_clean;
 221         while (1) {
 222                 while (i != head) {
 223                         tx_desc = IXGBE_TX_DESC_ADV(*tx_ring, i);
 224                         tx_buffer_info = &tx_ring->tx_buffer_info[i];
 225                         skb = tx_buffer_info->skb;
 226
 227                         if (skb) {
 228                                 unsigned int segs, bytecount;
 229
 230                                 /* gso_segs is currently only valid for tcp */
 231                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
 232                                 /* multiply data chunks by size of headers */
 233                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
 234                                             skb->len;
 235                                 total_packets += segs;
 236                                 total_bytes += bytecount;
 237                         }
 238
 239                         ixgbe_unmap_and_free_tx_resource(adapter,
 240                                                          tx_buffer_info);
 241
 242                         i++;
 243                         if (i == tx_ring->count)
 244                                 i = 0;
 245
 246                         count++;
 247                         if (count == tx_ring->count)
 248                                 goto done_cleaning;
 249                 }
 250                 oldhead = head;
 251                 rmb();
 252                 head = GET_TX_HEAD_FROM_RING(tx_ring);
 253                 head = le32_to_cpu(head);
 254                 if (head == oldhead)
 255                         goto done_cleaning;
 256         } /* while (1) */
 257
 258 done_cleaning:
 259         tx_ring->next_to_clean = i;
 260
 261 #define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
 262         if (unlikely(count && netif_carrier_ok(netdev) &&
 263                      (IXGBE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
 264                 /* Make sure that anybody stopping the queue after this
 265                  * sees the new next_to_clean.
 266                  */
 267                 smp_mb();
 268                 if (__netif_subqueue_stopped(netdev, tx_ring->queue_index) &&
 269                     !test_bit(__IXGBE_DOWN, &adapter->state)) {
 270                         netif_wake_subqueue(netdev, tx_ring->queue_index);
 271                         ++adapter->restart_queue;
 272                 }
 273         }
 274
 275         if (adapter->detect_tx_hung) {
 276                 if (ixgbe_check_tx_hang(adapter, tx_ring, i)) {
 277                         /* schedule immediate reset if we believe we hung */
 278                         DPRINTK(PROBE, INFO,
 279                                 "tx hang %d detected, resetting adapter\n",
 280                                 adapter->tx_timeout_count + 1);
 281                         ixgbe_tx_timeout(adapter->netdev);
 282                 }
 283         }
 284
 285         /* re-arm the interrupt */
 286         if ((total_packets >= tx_ring->work_limit) ||
 287             (count == tx_ring->count))
 288                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_EICS, tx_ring->v_idx);
 289
 290         tx_ring->total_bytes += total_bytes;
 291         tx_ring->total_packets += total_packets;
 292         tx_ring->stats.bytes += total_bytes;
 293         tx_ring->stats.packets += total_packets;
 294         adapter->net_stats.tx_bytes += total_bytes;
 295         adapter->net_stats.tx_packets += total_packets;
 296         return (total_packets ? true : false);
 297 }
 298
 299 #ifdef CONFIG_IXGBE_DCA
 300 static void ixgbe_update_rx_dca(struct ixgbe_adapter *adapter,
 301                                 struct ixgbe_ring *rx_ring)
 302 {
 303         u32 rxctrl;
 304         int cpu = get_cpu();
 305         int q = rx_ring - adapter->rx_ring;
 306
 307         if (rx_ring->cpu != cpu) {
 308                 rxctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_DCA_RXCTRL(q));
 309                 rxctrl &= ~IXGBE_DCA_RXCTRL_CPUID_MASK;
 310                 rxctrl |= dca3_get_tag(&adapter->pdev->dev, cpu);
 311                 rxctrl |= IXGBE_DCA_RXCTRL_DESC_DCA_EN;
 312                 rxctrl |= IXGBE_DCA_RXCTRL_HEAD_DCA_EN;
 313                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_RXCTRL(q), rxctrl);
 314                 rx_ring->cpu = cpu;
 315         }
 316         put_cpu();
 317 }
 318
 319 static void ixgbe_update_tx_dca(struct ixgbe_adapter *adapter,
 320                                 struct ixgbe_ring *tx_ring)
 321 {
 322         u32 txctrl;
 323         int cpu = get_cpu();
 324         int q = tx_ring - adapter->tx_ring;
 325
 326         if (tx_ring->cpu != cpu) {
 327                 txctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_DCA_TXCTRL(q));
 328                 txctrl &= ~IXGBE_DCA_TXCTRL_CPUID_MASK;
 329                 txctrl |= dca3_get_tag(&adapter->pdev->dev, cpu);
 330                 txctrl |= IXGBE_DCA_TXCTRL_DESC_DCA_EN;
 331                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_TXCTRL(q), txctrl);
 332                 tx_ring->cpu = cpu;
 333         }
 334         put_cpu();
 335 }
 336
 337 static void ixgbe_setup_dca(struct ixgbe_adapter *adapter)
 338 {
 339         int i;
 340
 341         if (!(adapter->flags & IXGBE_FLAG_DCA_ENABLED))
 342                 return;
 343
 344         for (i = 0; i < adapter->num_tx_queues; i++) {
 345                 adapter->tx_ring[i].cpu = -1;
 346                 ixgbe_update_tx_dca(adapter, &adapter->tx_ring[i]);
 347         }
 348         for (i = 0; i < adapter->num_rx_queues; i++) {
 349                 adapter->rx_ring[i].cpu = -1;
 350                 ixgbe_update_rx_dca(adapter, &adapter->rx_ring[i]);
 351         }
 352 }
 353
 354 static int __ixgbe_notify_dca(struct device *dev, void *data)
 355 {
 356         struct net_device *netdev = dev_get_drvdata(dev);
 357         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 358         unsigned long event = *(unsigned long *)data;
 359
 360         switch (event) {
 361         case DCA_PROVIDER_ADD:
 362                 /* if we're already enabled, don't do it again */
 363                 if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
 364                         break;
 365                 /* Always use CB2 mode, difference is masked
 366                  * in the CB driver. */
 367                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 2);
 368                 if (dca_add_requester(dev) == 0) {
 369                         adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
 370                         ixgbe_setup_dca(adapter);
 371                         break;
 372                 }
 373                 /* Fall Through since DCA is disabled. */
 374         case DCA_PROVIDER_REMOVE:
 375                 if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
 376                         dca_remove_requester(dev);
 377                         adapter->flags &= ~IXGBE_FLAG_DCA_ENABLED;
 378                         IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 1);
 379                 }
 380                 break;
 381         }
 382
 383         return 0;
 384 }
 385
 386 #endif /* CONFIG_IXGBE_DCA */
 387 /**
 388  * ixgbe_receive_skb - Send a completed packet up the stack
 389  * @adapter: board private structure
 390  * @skb: packet to send up
 391  * @status: hardware indication of status of receive
 392  * @rx_ring: rx descriptor ring (for a specific queue) to setup
 393  * @rx_desc: rx descriptor
 394  **/
 395 static void ixgbe_receive_skb(struct ixgbe_adapter *adapter,
 396                               struct sk_buff *skb, u8 status,
 397                               struct ixgbe_ring *ring,
 398                               union ixgbe_adv_rx_desc *rx_desc)
 399 {
 400         bool is_vlan = (status & IXGBE_RXD_STAT_VP);
 401         u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);
 402
 403         if (adapter->netdev->features & NETIF_F_LRO &&
 404             skb->ip_summed == CHECKSUM_UNNECESSARY) {
 405                 if (adapter->vlgrp && is_vlan)
 406                         lro_vlan_hwaccel_receive_skb(&ring->lro_mgr, skb,
 407                                                      adapter->vlgrp, tag,
 408                                                      rx_desc);
 409                 else
 410                         lro_receive_skb(&ring->lro_mgr, skb, rx_desc);
 411                 ring->lro_used = true;
 412         } else {
 413                 if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
 414                         if (adapter->vlgrp && is_vlan)
 415                                 vlan_hwaccel_receive_skb(skb, adapter->vlgrp, tag);
 416                         else
 417                                 netif_receive_skb(skb);
 418                 } else {
 419                         if (adapter->vlgrp && is_vlan)
 420                                 vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
 421                         else
 422                                 netif_rx(skb);
 423                 }
 424         }
 425 }
 426
 427 /**
 428  * ixgbe_rx_checksum - indicate in skb if hw indicated a good cksum
 429  * @adapter: address of board private structure
 430  * @status_err: hardware indication of status of receive
 431  * @skb: skb currently being received and modified
 432  **/
 433 static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
 434                                      u32 status_err, struct sk_buff *skb)
 435 {
 436         skb->ip_summed = CHECKSUM_NONE;
 437
 438         /* Rx csum disabled */
 439         if (!(adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED))
 440                 return;
 441
 442         /* if IP and error */
 443         if ((status_err & IXGBE_RXD_STAT_IPCS) &&
 444             (status_err & IXGBE_RXDADV_ERR_IPE)) {
 445                 adapter->hw_csum_rx_error++;
 446                 return;
 447         }
 448
 449         if (!(status_err & IXGBE_RXD_STAT_L4CS))
 450                 return;
 451
 452         if (status_err & IXGBE_RXDADV_ERR_TCPE) {
 453                 adapter->hw_csum_rx_error++;
 454                 return;
 455         }
 456
 457         /* It must be a TCP or UDP packet with a valid checksum */
 458         skb->ip_summed = CHECKSUM_UNNECESSARY;
 459         adapter->hw_csum_rx_good++;
 460 }
 461
 462 /**
 463  * ixgbe_alloc_rx_buffers - Replace used receive buffers; packet split
 464  * @adapter: address of board private structure
 465  **/
 466 static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
 467                                    struct ixgbe_ring *rx_ring,
 468                                    int cleaned_count)
 469 {
 470         struct pci_dev *pdev = adapter->pdev;
 471         union ixgbe_adv_rx_desc *rx_desc;
 472         struct ixgbe_rx_buffer *bi;
 473         unsigned int i;
 474         unsigned int bufsz = rx_ring->rx_buf_len + NET_IP_ALIGN;
 475
 476         i = rx_ring->next_to_use;
 477         bi = &rx_ring->rx_buffer_info[i];
 478
 479         while (cleaned_count--) {
 480                 rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);
 481
 482                 if (!bi->page_dma &&
 483                     (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED)) {
 484                         if (!bi->page) {
 485                                 bi->page = alloc_page(GFP_ATOMIC);
 486                                 if (!bi->page) {
 487                                         adapter->alloc_rx_page_failed++;
 488                                         goto no_buffers;
 489                                 }
 490                                 bi->page_offset = 0;
 491                         } else {
 492                                 /* use a half page if we're re-using */
 493                                 bi->page_offset ^= (PAGE_SIZE / 2);
 494                         }
 495
 496                         bi->page_dma = pci_map_page(pdev, bi->page,
 497                                                     bi->page_offset,
 498                                                     (PAGE_SIZE / 2),
 499                                                     PCI_DMA_FROMDEVICE);
 500                 }
 501
 502                 if (!bi->skb) {
 503                         struct sk_buff *skb = netdev_alloc_skb(adapter->netdev,
 504                                                                bufsz);
 505
 506                         if (!skb) {
 507                                 adapter->alloc_rx_buff_failed++;
 508                                 goto no_buffers;
 509                         }
 510
 511                         /*
 512                          * Make buffer alignment 2 beyond a 16 byte boundary
 513                          * this will result in a 16 byte aligned IP header after
 514                          * the 14 byte MAC header is removed
 515                          */
 516                         skb_reserve(skb, NET_IP_ALIGN);
 517
 518                         bi->skb = skb;
 519                         bi->dma = pci_map_single(pdev, skb->data, bufsz,
 520                                                  PCI_DMA_FROMDEVICE);
 521                 }
 522                 /* Refresh the desc even if buffer_addrs didn't change because
 523                  * each write-back erases this info. */
 524                 if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
 525                         rx_desc->read.pkt_addr = cpu_to_le64(bi->page_dma);
 526                         rx_desc->read.hdr_addr = cpu_to_le64(bi->dma);
 527                 } else {
 528                         rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
 529                 }
 530
 531                 i++;
 532                 if (i == rx_ring->count)
 533                         i = 0;
 534                 bi = &rx_ring->rx_buffer_info[i];
 535         }
 536
 537 no_buffers:
 538         if (rx_ring->next_to_use != i) {
 539                 rx_ring->next_to_use = i;
 540                 if (i-- == 0)
 541                         i = (rx_ring->count - 1);
 542
 543                 /*
 544                  * Force memory writes to complete before letting h/w
 545                  * know there are new descriptors to fetch.  (Only
 546                  * applicable for weak-ordered memory model archs,
 547                  * such as IA-64).
 548                  */
 549                 wmb();
 550                 writel(i, adapter->hw.hw_addr + rx_ring->tail);
 551         }
 552 }
 553
 554 static inline u16 ixgbe_get_hdr_info(union ixgbe_adv_rx_desc *rx_desc)
 555 {
 556         return rx_desc->wb.lower.lo_dword.hs_rss.hdr_info;
 557 }
 558
 559 static inline u16 ixgbe_get_pkt_info(union ixgbe_adv_rx_desc *rx_desc)
 560 {
 561         return rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
 562 }
 563
 564 static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
 565                                struct ixgbe_ring *rx_ring,
 566                                int *work_done, int work_to_do)
 567 {
 568         struct pci_dev *pdev = adapter->pdev;
 569         union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
 570         struct ixgbe_rx_buffer *rx_buffer_info, *next_buffer;
 571         struct sk_buff *skb;
 572         unsigned int i;
 573         u32 len, staterr;
 574         u16 hdr_info;
 575         bool cleaned = false;
 576         int cleaned_count = 0;
 577         unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 578
 579         i = rx_ring->next_to_clean;
 580         rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);
 581         staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 582         rx_buffer_info = &rx_ring->rx_buffer_info[i];
 583
 584         while (staterr & IXGBE_RXD_STAT_DD) {
 585                 u32 upper_len = 0;
 586                 if (*work_done >= work_to_do)
 587                         break;
 588                 (*work_done)++;
 589
 590                 if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
 591                         hdr_info = le16_to_cpu(ixgbe_get_hdr_info(rx_desc));
 592                         len = (hdr_info & IXGBE_RXDADV_HDRBUFLEN_MASK) >>
 593                                IXGBE_RXDADV_HDRBUFLEN_SHIFT;
 594                         if (hdr_info & IXGBE_RXDADV_SPH)
 595                                 adapter->rx_hdr_split++;
 596                         if (len > IXGBE_RX_HDR_SIZE)
 597                                 len = IXGBE_RX_HDR_SIZE;
 598                         upper_len = le16_to_cpu(rx_desc->wb.upper.length);
 599                 } else {
 600                         len = le16_to_cpu(rx_desc->wb.upper.length);
 601                 }
 602
 603                 cleaned = true;
 604                 skb = rx_buffer_info->skb;
 605                 prefetch(skb->data - NET_IP_ALIGN);
 606                 rx_buffer_info->skb = NULL;
 607
 608                 if (len && !skb_shinfo(skb)->nr_frags) {
 609                         pci_unmap_single(pdev, rx_buffer_info->dma,
 610                                          rx_ring->rx_buf_len + NET_IP_ALIGN,
 611                                          PCI_DMA_FROMDEVICE);
 612                         skb_put(skb, len);
 613                 }
 614
 615                 if (upper_len) {
 616                         pci_unmap_page(pdev, rx_buffer_info->page_dma,
 617                                        PAGE_SIZE / 2, PCI_DMA_FROMDEVICE);
 618                         rx_buffer_info->page_dma = 0;
 619                         skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
 620                                            rx_buffer_info->page,
 621                                            rx_buffer_info->page_offset,
 622                                            upper_len);
 623
 624                         if ((rx_ring->rx_buf_len > (PAGE_SIZE / 2)) ||
 625                             (page_count(rx_buffer_info->page) != 1))
 626                                 rx_buffer_info->page = NULL;
 627                         else
 628                                 get_page(rx_buffer_info->page);
 629
 630                         skb->len += upper_len;
 631                         skb->data_len += upper_len;
 632                         skb->truesize += upper_len;
 633                 }
 634
 635                 i++;
 636                 if (i == rx_ring->count)
 637                         i = 0;
 638                 next_buffer = &rx_ring->rx_buffer_info[i];
 639
 640                 next_rxd = IXGBE_RX_DESC_ADV(*rx_ring, i);
 641                 prefetch(next_rxd);
 642
 643                 cleaned_count++;
 644                 if (staterr & IXGBE_RXD_STAT_EOP) {
 645                         rx_ring->stats.packets++;
 646                         rx_ring->stats.bytes += skb->len;
 647                 } else {
 648                         rx_buffer_info->skb = next_buffer->skb;
 649                         rx_buffer_info->dma = next_buffer->dma;
 650                         next_buffer->skb = skb;
 651                         next_buffer->dma = 0;
 652                         adapter->non_eop_descs++;
 653                         goto next_desc;
 654                 }
 655
 656                 if (staterr & IXGBE_RXDADV_ERR_FRAME_ERR_MASK) {
 657                         dev_kfree_skb_irq(skb);
 658                         goto next_desc;
 659                 }
 660
 661                 ixgbe_rx_checksum(adapter, staterr, skb);
 662
 663                 /* probably a little skewed due to removing CRC */
 664                 total_rx_bytes += skb->len;
 665                 total_rx_packets++;
 666
 667                 skb->protocol = eth_type_trans(skb, adapter->netdev);
 668                 ixgbe_receive_skb(adapter, skb, staterr, rx_ring, rx_desc);
 669                 adapter->netdev->last_rx = jiffies;
 670
 671 next_desc:
 672                 rx_desc->wb.upper.status_error = 0;
 673
 674                 /* return some buffers to hardware, one at a time is too slow */
 675                 if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
 676                         ixgbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
 677                         cleaned_count = 0;
 678                 }
 679
 680                 /* use prefetched values */
 681                 rx_desc = next_rxd;
 682                 rx_buffer_info = next_buffer;
 683
 684                 staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 685         }
 686
 687         if (rx_ring->lro_used) {
 688                 lro_flush_all(&rx_ring->lro_mgr);
 689                 rx_ring->lro_used = false;
 690         }
 691
 692         rx_ring->next_to_clean = i;
 693         cleaned_count = IXGBE_DESC_UNUSED(rx_ring);
 694
 695         if (cleaned_count)
 696                 ixgbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
 697
 698         rx_ring->total_packets += total_rx_packets;
 699         rx_ring->total_bytes += total_rx_bytes;
 700         adapter->net_stats.rx_bytes += total_rx_bytes;
 701         adapter->net_stats.rx_packets += total_rx_packets;
 702
 703         return cleaned;
 704 }
 705
 706 static int ixgbe_clean_rxonly(struct napi_struct *, int);
 707 /**
 708  * ixgbe_configure_msix - Configure MSI-X hardware
 709  * @adapter: board private structure
 710  *
 711  * ixgbe_configure_msix sets up the hardware to properly generate MSI-X
 712  * interrupts.
 713  **/
 714 static void ixgbe_configure_msix(struct ixgbe_adapter *adapter)
 715 {
 716         struct ixgbe_q_vector *q_vector;
 717         int i, j, q_vectors, v_idx, r_idx;
 718         u32 mask;
 719
 720         q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
 721
 722         /* Populate the IVAR table and set the ITR values to the
 723          * corresponding register.
 724          */
 725         for (v_idx = 0; v_idx < q_vectors; v_idx++) {
 726                 q_vector = &adapter->q_vector[v_idx];
 727                 /* XXX for_each_bit(...) */
 728                 r_idx = find_first_bit(q_vector->rxr_idx,
 729                                        adapter->num_rx_queues);
 730
 731                 for (i = 0; i < q_vector->rxr_count; i++) {
 732                         j = adapter->rx_ring[r_idx].reg_idx;
 733                         ixgbe_set_ivar(adapter, IXGBE_IVAR_RX_QUEUE(j), v_idx);
 734                         r_idx = find_next_bit(q_vector->rxr_idx,
 735                                               adapter->num_rx_queues,
 736                                               r_idx + 1);
 737                 }
 738                 r_idx = find_first_bit(q_vector->txr_idx,
 739                                        adapter->num_tx_queues);
 740
 741                 for (i = 0; i < q_vector->txr_count; i++) {
 742                         j = adapter->tx_ring[r_idx].reg_idx;
 743                         ixgbe_set_ivar(adapter, IXGBE_IVAR_TX_QUEUE(j), v_idx);
 744                         r_idx = find_next_bit(q_vector->txr_idx,
 745                                               adapter->num_tx_queues,
 746                                               r_idx + 1);
 747                 }
 748
 749                 /* if this is a tx only vector halve the interrupt rate */
 750                 if (q_vector->txr_count && !q_vector->rxr_count)
 751                         q_vector->eitr = (adapter->eitr_param >> 1);
 752                 else
 753                         /* rx only */
 754                         q_vector->eitr = adapter->eitr_param;
 755
 756                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_EITR(v_idx),
 757                                 EITR_INTS_PER_SEC_TO_REG(q_vector->eitr));
 758         }
 759
 760         ixgbe_set_ivar(adapter, IXGBE_IVAR_OTHER_CAUSES_INDEX, v_idx);
 761         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EITR(v_idx), 1950);
 762
 763         /* set up to autoclear timer, and the vectors */
 764         mask = IXGBE_EIMS_ENABLE_MASK;
 765         mask &= ~(IXGBE_EIMS_OTHER | IXGBE_EIMS_LSC);
 766         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIAC, mask);
 767 }
 768
 769 enum latency_range {
 770         lowest_latency = 0,
 771         low_latency = 1,
 772         bulk_latency = 2,
 773         latency_invalid = 255
 774 };
 775
 776 /**
 777  * ixgbe_update_itr - update the dynamic ITR value based on statistics
 778  * @adapter: pointer to adapter
 779  * @eitr: eitr setting (ints per sec) to give last timeslice
 780  * @itr_setting: current throttle rate in ints/second
 781  * @packets: the number of packets during this measurement interval
 782  * @bytes: the number of bytes during this measurement interval
 783  *
 784  *      Stores a new ITR value based on packets and byte
 785  *      counts during the last interrupt.  The advantage of per interrupt
 786  *      computation is faster updates and more accurate ITR for the current
 787  *      traffic pattern.  Constants in this function were computed
 788  *      based on theoretical maximum wire speed and thresholds were set based
 789  *      on testing data as well as attempting to minimize response time
 790  *      while increasing bulk throughput.
 791  *      this functionality is controlled by the InterruptThrottleRate module
 792  *      parameter (see ixgbe_param.c)
 793  **/
 794 static u8 ixgbe_update_itr(struct ixgbe_adapter *adapter,
 795                            u32 eitr, u8 itr_setting,
 796                            int packets, int bytes)
 797 {
 798         unsigned int retval = itr_setting;
 799         u32 timepassed_us;
 800         u64 bytes_perint;
 801
 802         if (packets == 0)
 803                 goto update_itr_done;
 804
 805
 806         /* simple throttlerate management
 807          *    0-20MB/s lowest (100000 ints/s)
 808          *   20-100MB/s low   (20000 ints/s)
 809          *  100-1249MB/s bulk (8000 ints/s)
 810          */
 811         /* what was last interrupt timeslice? */
 812         timepassed_us = 1000000/eitr;
 813         bytes_perint = bytes / timepassed_us; /* bytes/usec */
 814
 815         switch (itr_setting) {
 816         case lowest_latency:
 817                 if (bytes_perint > adapter->eitr_low)
 818                         retval = low_latency;
 819                 break;
 820         case low_latency:
 821                 if (bytes_perint > adapter->eitr_high)
 822                         retval = bulk_latency;
 823                 else if (bytes_perint <= adapter->eitr_low)
 824                         retval = lowest_latency;
 825                 break;
 826         case bulk_latency:
 827                 if (bytes_perint <= adapter->eitr_high)
 828                         retval = low_latency;
 829                 break;
 830         }
 831
 832 update_itr_done:
 833         return retval;
 834 }
 835
 836 static void ixgbe_set_itr_msix(struct ixgbe_q_vector *q_vector)
 837 {
 838         struct ixgbe_adapter *adapter = q_vector->adapter;
 839         struct ixgbe_hw *hw = &adapter->hw;
 840         u32 new_itr;
 841         u8 current_itr, ret_itr;
 842         int i, r_idx, v_idx = ((void *)q_vector - (void *)(adapter->q_vector)) /
 843                                sizeof(struct ixgbe_q_vector);
 844         struct ixgbe_ring *rx_ring, *tx_ring;
 845
 846         r_idx = find_first_bit(q_vector->txr_idx, adapter->num_tx_queues);
 847         for (i = 0; i < q_vector->txr_count; i++) {
 848                 tx_ring = &(adapter->tx_ring[r_idx]);
 849                 ret_itr = ixgbe_update_itr(adapter, q_vector->eitr,
 850                                            q_vector->tx_itr,
 851                                            tx_ring->total_packets,
 852                                            tx_ring->total_bytes);
 853                 /* if the result for this queue would decrease interrupt
 854                  * rate for this vector then use that result */
 855                 q_vector->tx_itr = ((q_vector->tx_itr > ret_itr) ?
 856                                     q_vector->tx_itr - 1 : ret_itr);
 857                 r_idx = find_next_bit(q_vector->txr_idx, adapter->num_tx_queues,
 858                                       r_idx + 1);
 859         }
 860
 861         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
 862         for (i = 0; i < q_vector->rxr_count; i++) {
 863                 rx_ring = &(adapter->rx_ring[r_idx]);
 864                 ret_itr = ixgbe_update_itr(adapter, q_vector->eitr,
 865                                            q_vector->rx_itr,
 866                                            rx_ring->total_packets,
 867                                            rx_ring->total_bytes);
 868                 /* if the result for this queue would decrease interrupt
 869                  * rate for this vector then use that result */
 870                 q_vector->rx_itr = ((q_vector->rx_itr > ret_itr) ?
 871                                     q_vector->rx_itr - 1 : ret_itr);
 872                 r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
 873                                       r_idx + 1);
 874         }
 875
 876         current_itr = max(q_vector->rx_itr, q_vector->tx_itr);
 877
 878         switch (current_itr) {
 879         /* counts and packets in update_itr are dependent on these numbers */
 880         case lowest_latency:
 881                 new_itr = 100000;
 882                 break;
 883         case low_latency:
 884                 new_itr = 20000; /* aka hwitr = ~200 */
 885                 break;
 886         case bulk_latency:
 887         default:
 888                 new_itr = 8000;
 889                 break;
 890         }
 891
 892         if (new_itr != q_vector->eitr) {
 893                 u32 itr_reg;
 894                 /* do an exponential smoothing */
 895                 new_itr = ((q_vector->eitr * 90)/100) + ((new_itr * 10)/100);
 896                 q_vector->eitr = new_itr;
 897                 itr_reg = EITR_INTS_PER_SEC_TO_REG(new_itr);
 898                 /* must write high and low 16 bits to reset counter */
 899                 DPRINTK(TX_ERR, DEBUG, "writing eitr(%d): %08X\n", v_idx,
 900                         itr_reg);
 901                 IXGBE_WRITE_REG(hw, IXGBE_EITR(v_idx), itr_reg | (itr_reg)<<16);
 902         }
 903
 904         return;
 905 }
 906
 907
 908 static void ixgbe_check_lsc(struct ixgbe_adapter *adapter)
 909 {
 910         struct ixgbe_hw *hw = &adapter->hw;
 911
 912         adapter->lsc_int++;
 913         adapter->flags |= IXGBE_FLAG_NEED_LINK_UPDATE;
 914         adapter->link_check_timeout = jiffies;
 915         if (!test_bit(__IXGBE_DOWN, &adapter->state)) {
 916                 IXGBE_WRITE_REG(hw, IXGBE_EIMC, IXGBE_EIMC_LSC);
 917                 schedule_work(&adapter->watchdog_task);
 918         }
 919 }
 920
 921 static irqreturn_t ixgbe_msix_lsc(int irq, void *data)
 922 {
 923         struct net_device *netdev = data;
 924         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 925         struct ixgbe_hw *hw = &adapter->hw;
 926         u32 eicr = IXGBE_READ_REG(hw, IXGBE_EICR);
 927
 928         if (eicr & IXGBE_EICR_LSC)
 929                 ixgbe_check_lsc(adapter);
 930
 931         if (!test_bit(__IXGBE_DOWN, &adapter->state))
 932                 IXGBE_WRITE_REG(hw, IXGBE_EIMS, IXGBE_EIMS_OTHER);
 933
 934         return IRQ_HANDLED;
 935 }
 936
 937 static irqreturn_t ixgbe_msix_clean_tx(int irq, void *data)
 938 {
 939         struct ixgbe_q_vector *q_vector = data;
 940         struct ixgbe_adapter  *adapter = q_vector->adapter;
 941         struct ixgbe_ring     *tx_ring;
 942         int i, r_idx;
 943
 944         if (!q_vector->txr_count)
 945                 return IRQ_HANDLED;
 946
 947         r_idx = find_first_bit(q_vector->txr_idx, adapter->num_tx_queues);
 948         for (i = 0; i < q_vector->txr_count; i++) {
 949                 tx_ring = &(adapter->tx_ring[r_idx]);
 950 #ifdef CONFIG_IXGBE_DCA
 951                 if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
 952                         ixgbe_update_tx_dca(adapter, tx_ring);
 953 #endif
 954                 tx_ring->total_bytes = 0;
 955                 tx_ring->total_packets = 0;
 956                 ixgbe_clean_tx_irq(adapter, tx_ring);
 957                 r_idx = find_next_bit(q_vector->txr_idx, adapter->num_tx_queues,
 958                                       r_idx + 1);
 959         }
 960
 961         return IRQ_HANDLED;
 962 }
 963
 964 /**
 965  * ixgbe_msix_clean_rx - single unshared vector rx clean (all queues)
 966  * @irq: unused
 967  * @data: pointer to our q_vector struct for this interrupt vector
 968  **/
 969 static irqreturn_t ixgbe_msix_clean_rx(int irq, void *data)
 970 {
 971         struct ixgbe_q_vector *q_vector = data;
 972         struct ixgbe_adapter  *adapter = q_vector->adapter;
 973         struct ixgbe_ring  *rx_ring;
 974         int r_idx;
 975         int i;
 976
 977         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
 978         for (i = 0;  i < q_vector->rxr_count; i++) {
 979                 rx_ring = &(adapter->rx_ring[r_idx]);
 980                 rx_ring->total_bytes = 0;
 981                 rx_ring->total_packets = 0;
 982                 r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
 983                                       r_idx + 1);
 984         }
 985
 986         if (!q_vector->rxr_count)
 987                 return IRQ_HANDLED;
 988
 989         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
 990         rx_ring = &(adapter->rx_ring[r_idx]);
 991         /* disable interrupts on this vector only */
 992         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMC, rx_ring->v_idx);
 993         netif_rx_schedule(adapter->netdev, &q_vector->napi);
 994
 995         return IRQ_HANDLED;
 996 }
 997
 998 static irqreturn_t ixgbe_msix_clean_many(int irq, void *data)
 999 {
1000         ixgbe_msix_clean_rx(irq, data);
1001         ixgbe_msix_clean_tx(irq, data);
1002
1003         return IRQ_HANDLED;
1004 }
1005
1006 /**
1007  * ixgbe_clean_rxonly - msix (aka one shot) rx clean routine
1008  * @napi: napi struct with our devices info in it
1009  * @budget: amount of work driver is allowed to do this pass, in packets
1010  *
1011  * This function is optimized for cleaning one queue only on a single
1012  * q_vector!!!
1013  **/
1014 static int ixgbe_clean_rxonly(struct napi_struct *napi, int budget)
1015 {
1016         struct ixgbe_q_vector *q_vector =
1017                                container_of(napi, struct ixgbe_q_vector, napi);
1018         struct ixgbe_adapter *adapter = q_vector->adapter;
1019         struct ixgbe_ring *rx_ring = NULL;
1020         int work_done = 0;
1021         long r_idx;
1022
1023         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
1024         rx_ring = &(adapter->rx_ring[r_idx]);
1025 #ifdef CONFIG_IXGBE_DCA
1026         if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
1027                 ixgbe_update_rx_dca(adapter, rx_ring);
1028 #endif
1029
1030         ixgbe_clean_rx_irq(adapter, rx_ring, &work_done, budget);
1031
1032         /* If all Rx work done, exit the polling mode */
1033         if (work_done < budget) {
1034                 netif_rx_complete(adapter->netdev, napi);
1035                 if (adapter->itr_setting & 3)
1036                         ixgbe_set_itr_msix(q_vector);
1037                 if (!test_bit(__IXGBE_DOWN, &adapter->state))
1038                         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMS, rx_ring->v_idx);
1039         }
1040
1041         return work_done;
1042 }
1043
1044 /**
1045  * ixgbe_clean_rxonly_many - msix (aka one shot) rx clean routine
1046  * @napi: napi struct with our devices info in it
1047  * @budget: amount of work driver is allowed to do this pass, in packets
1048  *
1049  * This function will clean more than one rx queue associated with a
1050  * q_vector.
1051  **/
1052 static int ixgbe_clean_rxonly_many(struct napi_struct *napi, int budget)
1053 {
1054         struct ixgbe_q_vector *q_vector =
1055                                container_of(napi, struct ixgbe_q_vector, napi);
1056         struct ixgbe_adapter *adapter = q_vector->adapter;
1057         struct ixgbe_ring *rx_ring = NULL;
1058         int work_done = 0, i;
1059         long r_idx;
1060         u16 enable_mask = 0;
1061
1062         /* attempt to distribute budget to each queue fairly, but don't allow
1063          * the budget to go below 1 because we'll exit polling */
1064         budget /= (q_vector->rxr_count ?: 1);
1065         budget = max(budget, 1);
1066         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
1067         for (i = 0; i < q_vector->rxr_count; i++) {
1068                 rx_ring = &(adapter->rx_ring[r_idx]);
1069 #ifdef CONFIG_IXGBE_DCA
1070                 if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
1071                         ixgbe_update_rx_dca(adapter, rx_ring);
1072 #endif
1073                 ixgbe_clean_rx_irq(adapter, rx_ring, &work_done, budget);
1074                 enable_mask |= rx_ring->v_idx;
1075                 r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
1076                                       r_idx + 1);
1077         }
1078
1079         r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
1080         rx_ring = &(adapter->rx_ring[r_idx]);
1081         /* If all Rx work done, exit the polling mode */
1082         if (work_done < budget) {
1083                 netif_rx_complete(adapter->netdev, napi);
1084                 if (adapter->itr_setting & 3)
1085                         ixgbe_set_itr_msix(q_vector);
1086                 if (!test_bit(__IXGBE_DOWN, &adapter->state))
1087                         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMS, enable_mask);
1088                 return 0;
1089         }
1090
1091         return work_done;
1092 }
1093 static inline void map_vector_to_rxq(struct ixgbe_adapter *a, int v_idx,
1094                                      int r_idx)
1095 {
1096         a->q_vector[v_idx].adapter = a;
1097         set_bit(r_idx, a->q_vector[v_idx].rxr_idx);
1098         a->q_vector[v_idx].rxr_count++;
1099         a->rx_ring[r_idx].v_idx = 1 << v_idx;
1100 }
1101
1102 static inline void map_vector_to_txq(struct ixgbe_adapter *a, int v_idx,
1103                                      int r_idx)
1104 {
1105         a->q_vector[v_idx].adapter = a;
1106         set_bit(r_idx, a->q_vector[v_idx].txr_idx);
1107         a->q_vector[v_idx].txr_count++;
1108         a->tx_ring[r_idx].v_idx = 1 << v_idx;
1109 }
1110
1111 /**
1112  * ixgbe_map_rings_to_vectors - Maps descriptor rings to vectors
1113  * @adapter: board private structure to initialize
1114  * @vectors: allotted vector count for descriptor rings
1115  *
1116  * This function maps descriptor rings to the queue-specific vectors
1117  * we were allotted through the MSI-X enabling code.  Ideally, we'd have
1118  * one vector per ring/queue, but on a constrained vector budget, we
1119  * group the rings as "efficiently" as possible.  You would add new
1120  * mapping configurations in here.
1121  **/
1122 static int ixgbe_map_rings_to_vectors(struct ixgbe_adapter *adapter,
1123                                       int vectors)
1124 {
1125         int v_start = 0;
1126         int rxr_idx = 0, txr_idx = 0;
1127         int rxr_remaining = adapter->num_rx_queues;
1128         int txr_remaining = adapter->num_tx_queues;
1129         int i, j;
1130         int rqpv, tqpv;
1131         int err = 0;
1132
1133         /* No mapping required if MSI-X is disabled. */
1134         if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
1135                 goto out;
1136
1137         /*
1138          * The ideal configuration...
1139          * We have enough vectors to map one per queue.
1140          */
1141         if (vectors == adapter->num_rx_queues + adapter->num_tx_queues) {
1142                 for (; rxr_idx < rxr_remaining; v_start++, rxr_idx++)
1143                         map_vector_to_rxq(adapter, v_start, rxr_idx);
1144
1145                 for (; txr_idx < txr_remaining; v_start++, txr_idx++)
1146                         map_vector_to_txq(adapter, v_start, txr_idx);
1147
1148                 goto out;
1149         }
1150
1151         /*
1152          * If we don't have enough vectors for a 1-to-1
1153          * mapping, we'll have to group them so there are
1154          * multiple queues per vector.
1155          */
1156         /* Re-adjusting *qpv takes care of the remainder. */
1157         for (i = v_start; i < vectors; i++) {
1158                 rqpv = DIV_ROUND_UP(rxr_remaining, vectors - i);
1159                 for (j = 0; j < rqpv; j++) {
1160                         map_vector_to_rxq(adapter, i, rxr_idx);
1161                         rxr_idx++;
1162                         rxr_remaining--;
1163                 }
1164         }
1165         for (i = v_start; i < vectors; i++) {
1166                 tqpv = DIV_ROUND_UP(txr_remaining, vectors - i);
1167                 for (j = 0; j < tqpv; j++) {
1168                         map_vector_to_txq(adapter, i, txr_idx);
1169                         txr_idx++;
1170                         txr_remaining--;
1171                 }
1172         }
1173
1174 out:
1175         return err;
1176 }
1177
1178 /**
1179  * ixgbe_request_msix_irqs - Initialize MSI-X interrupts
1180  * @adapter: board private structure
1181  *
1182  * ixgbe_request_msix_irqs allocates MSI-X vectors and requests
1183  * interrupts from the kernel.
1184  **/
1185 static int ixgbe_request_msix_irqs(struct ixgbe_adapter *adapter)
1186 {
1187         struct net_device *netdev = adapter->netdev;
1188         irqreturn_t (*handler)(int, void *);
1189         int i, vector, q_vectors, err;
1190
1191         /* Decrement for Other and TCP Timer vectors */
1192         q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
1193
1194         /* Map the Tx/Rx rings to the vectors we were allotted. */
1195         err = ixgbe_map_rings_to_vectors(adapter, q_vectors);
1196         if (err)
1197                 goto out;
1198
1199 #define SET_HANDLER(_v) ((!(_v)->rxr_count) ? &ixgbe_msix_clean_tx : \
1200                          (!(_v)->txr_count) ? &ixgbe_msix_clean_rx : \
1201                          &ixgbe_msix_clean_many)
1202         for (vector = 0; vector < q_vectors; vector++) {
1203                 handler = SET_HANDLER(&adapter->q_vector[vector]);
1204                 sprintf(adapter->name[vector], "%s:v%d-%s",
1205                         netdev->name, vector,
1206                         (handler == &ixgbe_msix_clean_rx) ? "Rx" :
1207                          ((handler == &ixgbe_msix_clean_tx) ? "Tx" : "TxRx"));
1208                 err = request_irq(adapter->msix_entries[vector].vector,
1209                                   handler, 0, adapter->name[vector],
1210                                   &(adapter->q_vector[vector]));
1211                 if (err) {
1212                         DPRINTK(PROBE, ERR,
1213                                 "request_irq failed for MSIX interrupt "
1214                                 "Error: %d\n", err);
1215                         goto free_queue_irqs;
1216                 }
1217         }
1218
1219         sprintf(adapter->name[vector], "%s:lsc", netdev->name);
1220         err = request_irq(adapter->msix_entries[vector].vector,
1221                           &ixgbe_msix_lsc, 0, adapter->name[vector], netdev);
1222         if (err) {
1223                 DPRINTK(PROBE, ERR,
1224                         "request_irq for msix_lsc failed: %d\n", err);
1225                 goto free_queue_irqs;
1226         }
1227
1228         return 0;
1229
1230 free_queue_irqs:
1231         for (i = vector - 1; i >= 0; i--)
1232                 free_irq(adapter->msix_entries[--vector].vector,
1233                          &(adapter->q_vector[i]));
1234         adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
1235         pci_disable_msix(adapter->pdev);
1236         kfree(adapter->msix_entries);
1237         adapter->msix_entries = NULL;
1238 out:
1239         return err;
1240 }
1241
1242 static void ixgbe_set_itr(struct ixgbe_adapter *adapter)
1243 {
1244         struct ixgbe_hw *hw = &adapter->hw;
1245         struct ixgbe_q_vector *q_vector = adapter->q_vector;
1246         u8 current_itr;
1247         u32 new_itr = q_vector->eitr;
1248         struct ixgbe_ring *rx_ring = &adapter->rx_ring[0];
1249         struct ixgbe_ring *tx_ring = &adapter->tx_ring[0];
1250
1251         q_vector->tx_itr = ixgbe_update_itr(adapter, new_itr,
1252                                             q_vector->tx_itr,
1253                                             tx_ring->total_packets,
1254                                             tx_ring->total_bytes);
1255         q_vector->rx_itr = ixgbe_update_itr(adapter, new_itr,
1256                                             q_vector->rx_itr,
1257                                             rx_ring->total_packets,
1258                                             rx_ring->total_bytes);
1259
1260         current_itr = max(q_vector->rx_itr, q_vector->tx_itr);
1261
1262         switch (current_itr) {
1263         /* counts and packets in update_itr are dependent on these numbers */
1264         case lowest_latency:
1265                 new_itr = 100000;
1266                 break;
1267         case low_latency:
1268                 new_itr = 20000; /* aka hwitr = ~200 */
1269                 break;
1270         case bulk_latency:
1271                 new_itr = 8000;
1272                 break;
1273         default:
1274                 break;
1275         }
1276
1277         if (new_itr != q_vector->eitr) {
1278                 u32 itr_reg;
1279                 /* do an exponential smoothing */
1280                 new_itr = ((q_vector->eitr * 90)/100) + ((new_itr * 10)/100);
1281                 q_vector->eitr = new_itr;
1282                 itr_reg = EITR_INTS_PER_SEC_TO_REG(new_itr);
1283                 /* must write high and low 16 bits to reset counter */
1284                 IXGBE_WRITE_REG(hw, IXGBE_EITR(0), itr_reg | (itr_reg)<<16);
1285         }
1286
1287         return;
1288 }
1289
1290 static inline void ixgbe_irq_enable(struct ixgbe_adapter *adapter);
1291
1292 /**
1293  * ixgbe_intr - legacy mode Interrupt Handler
1294  * @irq: interrupt number
1295  * @data: pointer to a network interface device structure
1296  * @pt_regs: CPU registers structure
1297  **/
1298 static irqreturn_t ixgbe_intr(int irq, void *data)
1299 {
1300         struct net_device *netdev = data;
1301         struct ixgbe_adapter *adapter = netdev_priv(netdev);
1302         struct ixgbe_hw *hw = &adapter->hw;
1303         u32 eicr;
1304
1305         /* for NAPI, using EIAM to auto-mask tx/rx interrupt bits on read
1306          * therefore no explict interrupt disable is necessary */
1307         eicr = IXGBE_READ_REG(hw, IXGBE_EICR);
1308         if (!eicr) {
1309                 /* shared interrupt alert!
1310                  * make sure interrupts are enabled because the read will
1311                  * have disabled interrupts due to EIAM */
1312                 ixgbe_irq_enable(adapter);
1313                 return IRQ_NONE;        /* Not our interrupt */
1314         }
1315
1316         if (eicr & IXGBE_EICR_LSC)
1317                 ixgbe_check_lsc(adapter);
1318
1319         if (netif_rx_schedule_prep(netdev, &adapter->q_vector[0].napi)) {
1320                 adapter->tx_ring[0].total_packets = 0;
1321                 adapter->tx_ring[0].total_bytes = 0;
1322                 adapter->rx_ring[0].total_packets = 0;
1323                 adapter->rx_ring[0].total_bytes = 0;
1324                 /* would disable interrupts here but EIAM disabled it */
1325                 __netif_rx_schedule(netdev, &adapter->q_vector[0].napi);
1326         }
1327
1328         return IRQ_HANDLED;
1329 }
1330
1331 static inline void ixgbe_reset_q_vectors(struct ixgbe_adapter *adapter)
1332 {
1333         int i, q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
1334
1335         for (i = 0; i < q_vectors; i++) {
1336                 struct ixgbe_q_vector *q_vector = &adapter->q_vector[i];
1337                 bitmap_zero(q_vector->rxr_idx, MAX_RX_QUEUES);
1338                 bitmap_zero(q_vector->txr_idx, MAX_TX_QUEUES);
1339                 q_vector->rxr_count = 0;
1340                 q_vector->txr_count = 0;
1341         }
1342 }
1343
1344 /**
1345  * ixgbe_request_irq - initialize interrupts
1346  * @adapter: board private structure
1347  *
1348  * Attempts to configure interrupts using the best available
1349  * capabilities of the hardware and kernel.
1350  **/
1351 static int ixgbe_request_irq(struct ixgbe_adapter *adapter)
1352 {
1353         struct net_device *netdev = adapter->netdev;
1354         int err;
1355
1356         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
1357                 err = ixgbe_request_msix_irqs(adapter);
1358         } else if (adapter->flags & IXGBE_FLAG_MSI_ENABLED) {
1359                 err = request_irq(adapter->pdev->irq, &ixgbe_intr, 0,
1360                                   netdev->name, netdev);
1361         } else {
1362                 err = request_irq(adapter->pdev->irq, &ixgbe_intr, IRQF_SHARED,
1363                                   netdev->name, netdev);
1364         }
1365
1366         if (err)
1367                 DPRINTK(PROBE, ERR, "request_irq failed, Error %d\n", err);
1368
1369         return err;
1370 }
1371
1372 static void ixgbe_free_irq(struct ixgbe_adapter *adapter)
1373 {
1374         struct net_device *netdev = adapter->netdev;
1375
1376         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
1377                 int i, q_vectors;
1378
1379                 q_vectors = adapter->num_msix_vectors;
1380
1381                 i = q_vectors - 1;
1382                 free_irq(adapter->msix_entries[i].vector, netdev);
1383
1384                 i--;
1385                 for (; i >= 0; i--) {
1386                         free_irq(adapter->msix_entries[i].vector,
1387                                  &(adapter->q_vector[i]));
1388                 }
1389
1390                 ixgbe_reset_q_vectors(adapter);
1391         } else {
1392                 free_irq(adapter->pdev->irq, netdev);
1393         }
1394 }
1395
1396 /**
1397  * ixgbe_irq_disable - Mask off interrupt generation on the NIC
1398  * @adapter: board private structure
1399  **/
1400 static inline void ixgbe_irq_disable(struct ixgbe_adapter *adapter)
1401 {
1402         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMC, ~0);
1403         IXGBE_WRITE_FLUSH(&adapter->hw);
1404         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
1405                 int i;
1406                 for (i = 0; i < adapter->num_msix_vectors; i++)
1407                         synchronize_irq(adapter->msix_entries[i].vector);
1408         } else {
1409                 synchronize_irq(adapter->pdev->irq);
1410         }
1411 }
1412
1413 /**
1414  * ixgbe_irq_enable - Enable default interrupt generation settings
1415  * @adapter: board private structure
1416  **/
1417 static inline void ixgbe_irq_enable(struct ixgbe_adapter *adapter)
1418 {
1419         u32 mask;
1420         mask = IXGBE_EIMS_ENABLE_MASK;
1421         IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMS, mask);
1422         IXGBE_WRITE_FLUSH(&adapter->hw);
1423 }
1424
1425 /**
1426  * ixgbe_configure_msi_and_legacy - Initialize PIN (INTA...) and MSI interrupts
1427  *
1428  **/
1429 static void ixgbe_configure_msi_and_legacy(struct ixgbe_adapter *adapter)
1430 {
1431         struct ixgbe_hw *hw = &adapter->hw;
1432
1433         IXGBE_WRITE_REG(hw, IXGBE_EITR(0),
1434                         EITR_INTS_PER_SEC_TO_REG(adapter->eitr_param));
1435
1436         ixgbe_set_ivar(adapter, IXGBE_IVAR_RX_QUEUE(0), 0);
1437         ixgbe_set_ivar(adapter, IXGBE_IVAR_TX_QUEUE(0), 0);
1438
1439         map_vector_to_rxq(adapter, 0, 0);
1440         map_vector_to_txq(adapter, 0, 0);
1441
1442         DPRINTK(HW, INFO, "Legacy interrupt IVAR setup done\n");
1443 }
1444
1445 /**
1446  * ixgbe_configure_tx - Configure 8259x Transmit Unit after Reset
1447  * @adapter: board private structure
1448  *
1449  * Configure the Tx unit of the MAC after a reset.
1450  **/
1451 static void ixgbe_configure_tx(struct ixgbe_adapter *adapter)
1452 {
1453         u64 tdba, tdwba;
1454         struct ixgbe_hw *hw = &adapter->hw;
1455         u32 i, j, tdlen, txctrl;
1456
1457         /* Setup the HW Tx Head and Tail descriptor pointers */
1458         for (i = 0; i < adapter->num_tx_queues; i++) {
1459                 struct ixgbe_ring *ring = &adapter->tx_ring[i];
1460                 j = ring->reg_idx;
1461                 tdba = ring->dma;
1462                 tdlen = ring->count * sizeof(union ixgbe_adv_tx_desc);
1463                 IXGBE_WRITE_REG(hw, IXGBE_TDBAL(j),
1464                                 (tdba & DMA_32BIT_MASK));
1465                 IXGBE_WRITE_REG(hw, IXGBE_TDBAH(j), (tdba >> 32));
1466                 tdwba = ring->dma +
1467                         (ring->count * sizeof(union ixgbe_adv_tx_desc));
1468                 tdwba |= IXGBE_TDWBAL_HEAD_WB_ENABLE;
1469                 IXGBE_WRITE_REG(hw, IXGBE_TDWBAL(j), tdwba & DMA_32BIT_MASK);
1470                 IXGBE_WRITE_REG(hw, IXGBE_TDWBAH(j), (tdwba >> 32));
1471                 IXGBE_WRITE_REG(hw, IXGBE_TDLEN(j), tdlen);
1472                 IXGBE_WRITE_REG(hw, IXGBE_TDH(j), 0);
1473                 IXGBE_WRITE_REG(hw, IXGBE_TDT(j), 0);
1474                 adapter->tx_ring[i].head = IXGBE_TDH(j);
1475                 adapter->tx_ring[i].tail = IXGBE_TDT(j);
1476                 /* Disable Tx Head Writeback RO bit, since this hoses
1477                  * bookkeeping if things aren't delivered in order.
1478                  */
1479                 txctrl = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(j));
1480                 txctrl &= ~IXGBE_DCA_TXCTRL_TX_WB_RO_EN;
1481                 IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(j), txctrl);
1482         }
1483 }
1484
1485 #define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2
1486
1487 static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter, int index)
1488 {
1489         struct ixgbe_ring *rx_ring;
1490         u32 srrctl;
1491         int queue0;
1492         unsigned long mask;
1493
1494         /* program one srrctl register per VMDq index */
1495         if (adapter->flags & IXGBE_FLAG_VMDQ_ENABLED) {
1496                 long shift, len;
1497                 mask = (unsigned long) adapter->ring_feature[RING_F_RSS].mask;
1498                 len = sizeof(adapter->ring_feature[RING_F_VMDQ].mask) * 8;
1499                 shift = find_first_bit(&mask, len);
1500                 queue0 = index & mask;
1501                 index = (index & mask) >> shift;
1502         /* program one srrctl per RSS queue since RDRXCTL.MVMEN is enabled */
1503         } else {
1504                 mask = (unsigned long) adapter->ring_feature[RING_F_RSS].mask;
1505                 queue0 = index & mask;
1506                 index = index & mask;
1507         }
1508
1509         rx_ring = &adapter->rx_ring[queue0];
1510
1511         srrctl = IXGBE_READ_REG(&adapter->hw, IXGBE_SRRCTL(index));
1512
1513         srrctl &= ~IXGBE_SRRCTL_BSIZEHDR_MASK;
1514         srrctl &= ~IXGBE_SRRCTL_BSIZEPKT_MASK;
1515
1516         if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
1517                 srrctl |= IXGBE_RXBUFFER_2048 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
1518                 srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
1519                 srrctl |= ((IXGBE_RX_HDR_SIZE <<
1520                             IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
1521                            IXGBE_SRRCTL_BSIZEHDR_MASK);
1522         } else {
1523                 srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
1524
1525                 if (rx_ring->rx_buf_len == MAXIMUM_ETHERNET_VLAN_SIZE)
1526                         srrctl |= IXGBE_RXBUFFER_2048 >>
1527                                   IXGBE_SRRCTL_BSIZEPKT_SHIFT;
1528                 else
1529                         srrctl |= rx_ring->rx_buf_len >>
1530                                   IXGBE_SRRCTL_BSIZEPKT_SHIFT;
1531         }
1532         IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(index), srrctl);
1533 }
1534
1535 /**
1536  * ixgbe_get_skb_hdr - helper function for LRO header processing
1537  * @skb: pointer to sk_buff to be added to LRO packet
1538  * @iphdr: pointer to ip header structure
1539  * @tcph: pointer to tcp header structure
1540  * @hdr_flags: pointer to header flags
1541  * @priv: private data
1542  **/
1543 static int ixgbe_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
1544                              u64 *hdr_flags, void *priv)
1545 {
1546         union ixgbe_adv_rx_desc *rx_desc = priv;
1547
1548         /* Verify that this is a valid IPv4 TCP packet */
1549         if (!((ixgbe_get_pkt_info(rx_desc) & IXGBE_RXDADV_PKTTYPE_IPV4) &&
1550              (ixgbe_get_pkt_info(rx_desc) & IXGBE_RXDADV_PKTTYPE_TCP)))
1551                 return -1;
1552
1553         /* Set network headers */
1554         skb_reset_network_header(skb);
1555         skb_set_transport_header(skb, ip_hdrlen(skb));
1556         *iphdr = ip_hdr(skb);
1557         *tcph = tcp_hdr(skb);
1558         *hdr_flags = LRO_IPV4 | LRO_TCP;
1559         return 0;
1560 }
1561
1562 #define PAGE_USE_COUNT(S) (((S) >> PAGE_SHIFT) + \
1563                            (((S) & (PAGE_SIZE - 1)) ? 1 : 0))
1564
1565 /**
1566  * ixgbe_configure_rx - Configure 8259x Receive Unit after Reset
1567  * @adapter: board private structure
1568  *
1569  * Configure the Rx unit of the MAC after a reset.
1570  **/
1571 static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
1572 {
1573         u64 rdba;
1574         struct ixgbe_hw *hw = &adapter->hw;
1575         struct net_device *netdev = adapter->netdev;
1576         int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
1577         int i, j;
1578         u32 rdlen, rxctrl, rxcsum;
1579         static const u32 seed[10] = { 0xE291D73D, 0x1805EC6C, 0x2A94B30D,
1580                           0xA54F2BEC, 0xEA49AF7C, 0xE214AD3D, 0xB855AABE,
1581                           0x6A3E67EA, 0x14364D17, 0x3BED200D};
1582         u32 fctrl, hlreg0;
1583         u32 pages;
1584         u32 reta = 0, mrqc;
1585         u32 rdrxctl;
1586         int rx_buf_len;
1587
1588         /* Decide whether to use packet split mode or not */
1589         adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
1590
1591         /* Set the RX buffer length according to the mode */
1592         if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
1593                 rx_buf_len = IXGBE_RX_HDR_SIZE;
1594         } else {
1595                 if (netdev->mtu <= ETH_DATA_LEN)
1596                         rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
1597                 else
1598                         rx_buf_len = ALIGN(max_frame, 1024);
1599         }
1600
1601         fctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_FCTRL);
1602         fctrl |= IXGBE_FCTRL_BAM;
1603         fctrl |= IXGBE_FCTRL_DPF; /* discard pause frames when FC enabled */
1604         IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCTRL, fctrl);
1605
1606         hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
1607         if (adapter->netdev->mtu <= ETH_DATA_LEN)
1608                 hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
1609         else
1610                 hlreg0 |= IXGBE_HLREG0_JUMBOEN;
1611         IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);
1612
1613         pages = PAGE_USE_COUNT(adapter->netdev->mtu);
1614
1615         rdlen = adapter->rx_ring[0].count * sizeof(union ixgbe_adv_rx_desc);
1616         /* disable receives while setting up the descriptors */
1617         rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
1618         IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, rxctrl & ~IXGBE_RXCTRL_RXEN);
1619
1620         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1621          * the Base and Length of the Rx Descriptor Ring */
1622         for (i = 0; i < adapter->num_rx_queues; i++) {
1623                 rdba = adapter->rx_ring[i].dma;
1624                 j = adapter->rx_ring[i].reg_idx;
1625                 IXGBE_WRITE_REG(hw, IXGBE_RDBAL(j), (rdba & DMA_32BIT_MASK));
1626                 IXGBE_WRITE_REG(hw, IXGBE_RDBAH(j), (rdba >> 32));
1627                 IXGBE_WRITE_REG(hw, IXGBE_RDLEN(j), rdlen);
1628                 IXGBE_WRITE_REG(hw, IXGBE_RDH(j), 0);
1629                 IXGBE_WRITE_REG(hw, IXGBE_RDT(j), 0);
1630                 adapter->rx_ring[i].head = IXGBE_RDH(j);
1631                 adapter->rx_ring[i].tail = IXGBE_RDT(j);
1632                 adapter->rx_ring[i].rx_buf_len = rx_buf_len;
1633                 /* Intitial LRO Settings */
1634                 adapter->rx_ring[i].lro_mgr.max_aggr = IXGBE_MAX_LRO_AGGREGATE;
1635                 adapter->rx_ring[i].lro_mgr.max_desc = IXGBE_MAX_LRO_DESCRIPTORS;
1636                 adapter->rx_ring[i].lro_mgr.get_skb_header = ixgbe_get_skb_hdr;
1637                 adapter->rx_ring[i].lro_mgr.features = LRO_F_EXTRACT_VLAN_ID;
1638                 if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
1639                         adapter->rx_ring[i].lro_mgr.features |= LRO_F_NAPI;
1640                 adapter->rx_ring[i].lro_mgr.dev = adapter->netdev;
1641                 adapter->rx_ring[i].lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
1642                 adapter->rx_ring[i].lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1643
1644                 ixgbe_configure_srrctl(adapter, j);
1645         }
1646
1647         /*
1648          * For VMDq support of different descriptor types or
1649          * buffer sizes through the use of multiple SRRCTL
1650          * registers, RDRXCTL.MVMEN must be set to 1
1651          *
1652          * also, the manual doesn't mention it clearly but DCA hints
1653          * will only use queue 0's tags unless this bit is set.  Side
1654          * effects of setting this bit are only that SRRCTL must be
1655          * fully programmed [0..15]
1656          */
1657         rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
1658         rdrxctl |= IXGBE_RDRXCTL_MVMEN;
1659         IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl);
1660
1661
1662         if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) {
1663                 /* Fill out redirection table */
1664                 for (i = 0, j = 0; i < 128; i++, j++) {
1665                         if (j == adapter->ring_feature[RING_F_RSS].indices)
1666                                 j = 0;
1667                         /* reta = 4-byte sliding window of
1668                          * 0x00..(indices-1)(indices-1)00..etc. */
1669                         reta = (reta << 8) | (j * 0x11);
1670                         if ((i & 3) == 3)
1671                                 IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2), reta);
1672                 }
1673
1674                 /* Fill out hash function seeds */
1675                 for (i = 0; i < 10; i++)
1676                         IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), seed[i]);
1677
1678                 mrqc = IXGBE_MRQC_RSSEN
1679                     /* Perform hash on these packet types */
1680                        | IXGBE_MRQC_RSS_FIELD_IPV4
1681                        | IXGBE_MRQC_RSS_FIELD_IPV4_TCP
1682                        | IXGBE_MRQC_RSS_FIELD_IPV4_UDP
1683                        | IXGBE_MRQC_RSS_FIELD_IPV6_EX_TCP
1684                        | IXGBE_MRQC_RSS_FIELD_IPV6_EX
1685                        | IXGBE_MRQC_RSS_FIELD_IPV6
1686                        | IXGBE_MRQC_RSS_FIELD_IPV6_TCP
1687                        | IXGBE_MRQC_RSS_FIELD_IPV6_UDP
1688                        | IXGBE_MRQC_RSS_FIELD_IPV6_EX_UDP;
1689                 IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
1690         }
1691
1692         rxcsum = IXGBE_READ_REG(hw, IXGBE_RXCSUM);
1693
1694         if (adapter->flags & IXGBE_FLAG_RSS_ENABLED ||
1695             adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED) {
1696                 /* Disable indicating checksum in descriptor, enables
1697                  * RSS hash */
1698                 rxcsum |= IXGBE_RXCSUM_PCSD;
1699         }
1700         if (!(rxcsum & IXGBE_RXCSUM_PCSD)) {
1701                 /* Enable IPv4 payload checksum for UDP fragments
1702                  * if PCSD is not set */
1703                 rxcsum |= IXGBE_RXCSUM_IPPCSE;
1704         }
1705
1706         IXGBE_WRITE_REG(hw, IXGBE_RXCSUM, rxcsum);
1707 }
1708
1709 static void ixgbe_vlan_rx_register(struct net_device *netdev,
1710                                    struct vlan_group *grp)
1711 {
1712         struct ixgbe_adapter *adapter = netdev_priv(netdev);
1713         u32 ctrl;
1714
1715         if (!test_bit(__IXGBE_DOWN, &adapter->state))
1716                 ixgbe_irq_disable(adapter);
1717         adapter->vlgrp = grp;
1718
1719         if (grp) {
1720                 /* enable VLAN tag insert/strip */
1721                 ctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_VLNCTRL);
1722                 ctrl |= IXGBE_VLNCTRL_VME;
1723                 ctrl &= ~IXGBE_VLNCTRL_CFIEN;
1724                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_VLNCTRL, ctrl);
1725         }
1726
1727         if (!test_bit(__IXGBE_DOWN, &adapter->state))
1728                 ixgbe_irq_enable(adapter);
1729 }
1730
1731 static void ixgbe_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
1732 {
1733         struct ixgbe_adapter *adapter = netdev_priv(netdev);
1734         struct ixgbe_hw *hw = &adapter->hw;
1735
1736         /* add VID to filter table */
1737         hw->mac.ops.set_vfta(&adapter->hw, vid, 0, true);
1738 }
1739
1740 static void ixgbe_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
1741 {
1742         struct ixgbe_adapter *adapter = netdev_priv(netdev);
1743         struct ixgbe_hw *hw = &adapter->hw;
1744
1745         if (!test_bit(__IXGBE_DOWN, &adapter->state))
1746                 ixgbe_irq_disable(adapter);
1747
1748         vlan_group_set_device(adapter->vlgrp, vid, NULL);
1749
1750         if (!test_bit(__IXGBE_DOWN, &adapter->state))
1751                 ixgbe_irq_enable(adapter);
1752
1753         /* remove VID from filter table */
1754         hw->mac.ops.set_vfta(&adapter->hw, vid, 0, false);
1755 }
1756
1757 static void ixgbe_restore_vlan(struct ixgbe_adapter *adapter)
1758 {
1759         ixgbe_vlan_rx_register(adapter->netdev, adapter->vlgrp);
1760
1761         if (adapter->vlgrp) {
1762                 u16 vid;
1763                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
1764                         if (!vlan_group_get_device(adapter->vlgrp, vid))
1765                                 continue;
1766                         ixgbe_vlan_rx_add_vid(adapter->netdev, vid);
1767                 }
1768         }
1769 }
1770
1771 static u8 *ixgbe_addr_list_itr(struct ixgbe_hw *hw, u8 **mc_addr_ptr, u32 *vmdq)
1772 {
1773         struct dev_mc_list *mc_ptr;
1774         u8 *addr = *mc_addr_ptr;
1775         *vmdq = 0;
1776
1777         mc_ptr = container_of(addr, struct dev_mc_list, dmi_addr[0]);
1778         if (mc_ptr->next)
1779                 *mc_addr_ptr = mc_ptr->next->dmi_addr;
1780         else
1781                 *mc_addr_ptr = NULL;
1782
1783         return addr;
1784 }
1785
1786 /**
1787  * ixgbe_set_rx_mode - Unicast, Multicast and Promiscuous mode set
1788  * @netdev: network interface device structure
1789  *
1790  * The set_rx_method entry point is called whenever the unicast/multicast
1791  * address list or the network interface flags are updated.  This routine is
1792  * responsible for configuring the hardware for proper unicast, multicast and
1793  * promiscuous mode.
1794  **/
1795 static void ixgbe_set_rx_mode(struct net_device *netdev)
1796 {
1797         struct ixgbe_adapter *adapter = netdev_priv(netdev);
1798         struct ixgbe_hw *hw = &adapter->hw;
1799         u32 fctrl, vlnctrl;
1800         u8 *addr_list = NULL;
1801         int addr_count = 0;
1802
1803         /* Check for Promiscuous and All Multicast modes */
1804
1805         fctrl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
1806         vlnctrl = IXGBE_READ_REG(hw, IXGBE_VLNCTRL);
1807
1808         if (netdev->flags & IFF_PROMISC) {
1809                 hw->addr_ctrl.user_set_promisc = 1;
1810                 fctrl |= (IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
1811                 vlnctrl &= ~IXGBE_VLNCTRL_VFE;
1812         } else {
1813                 if (netdev->flags & IFF_ALLMULTI) {
1814                         fctrl |= IXGBE_FCTRL_MPE;
1815                         fctrl &= ~IXGBE_FCTRL_UPE;
1816                 } else {
1817                         fctrl &= ~(IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
1818                 }
1819                 vlnctrl |= IXGBE_VLNCTRL_VFE;
1820                 hw->addr_ctrl.user_set_promisc = 0;
1821         }
1822
1823         IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);
1824         IXGBE_WRITE_REG(hw, IXGBE_VLNCTRL, vlnctrl);
1825
1826         /* reprogram secondary unicast list */
1827         addr_count = netdev->uc_count;
1828         if (addr_count)
1829                 addr_list = netdev->uc_list->dmi_addr;
1830         hw->mac.ops.update_uc_addr_list(hw, addr_list, addr_count,
1831                                           ixgbe_addr_list_itr);
1832
1833         /* reprogram multicast list */
1834         addr_count = netdev->mc_count;
1835         if (addr_count)
1836                 addr_list = netdev->mc_list->dmi_addr;
1837         hw->mac.ops.update_mc_addr_list(hw, addr_list, addr_count,
1838                                         ixgbe_addr_list_itr);
1839 }
1840
1841 static void ixgbe_napi_enable_all(struct ixgbe_adapter *adapter)
1842 {
1843         int q_idx;
1844         struct ixgbe_q_vector *q_vector;
1845         int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
1846
1847         /* legacy and MSI only use one vector */
1848         if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
1849                 q_vectors = 1;
1850
1851         for (q_idx = 0; q_idx < q_vectors; q_idx++) {
1852                 struct napi_struct *napi;
1853                 q_vector = &adapter->q_vector[q_idx];
1854                 if (!q_vector->rxr_count)
1855                         continue;
1856                 napi = &q_vector->napi;
1857                 if ((adapter->flags & IXGBE_FLAG_MSIX_ENABLED) &&
1858                     (q_vector->rxr_count > 1))
1859                         napi->poll = &ixgbe_clean_rxonly_many;
1860
1861                 napi_enable(napi);
1862         }
1863 }
1864
1865 static void ixgbe_napi_disable_all(struct ixgbe_adapter *adapter)
1866 {
1867         int q_idx;
1868         struct ixgbe_q_vector *q_vector;
1869         int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
1870
1871         /* legacy and MSI only use one vector */
1872         if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
1873                 q_vectors = 1;
1874
1875         for (q_idx = 0; q_idx < q_vectors; q_idx++) {
1876                 q_vector = &adapter->q_vector[q_idx];
1877                 if (!q_vector->rxr_count)
1878                         continue;
1879                 napi_disable(&q_vector->napi);
1880         }
1881 }
1882
1883 static void ixgbe_configure(struct ixgbe_adapter *adapter)
1884 {
1885         struct net_device *netdev = adapter->netdev;
1886         int i;
1887
1888         ixgbe_set_rx_mode(netdev);
1889
1890         ixgbe_restore_vlan(adapter);
1891
1892         ixgbe_configure_tx(adapter);
1893         ixgbe_configure_rx(adapter);
1894         for (i = 0; i < adapter->num_rx_queues; i++)
1895                 ixgbe_alloc_rx_buffers(adapter, &adapter->rx_ring[i],
1896                                        (adapter->rx_ring[i].count - 1));
1897 }
1898
1899 static int ixgbe_up_complete(struct ixgbe_adapter *adapter)
1900 {
1901         struct net_device *netdev = adapter->netdev;
1902         struct ixgbe_hw *hw = &adapter->hw;
1903         int i, j = 0;
1904         int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
1905         u32 txdctl, rxdctl, mhadd;
1906         u32 gpie;
1907
1908         ixgbe_get_hw_control(adapter);
1909
1910         if ((adapter->flags & IXGBE_FLAG_MSIX_ENABLED) ||
1911             (adapter->flags & IXGBE_FLAG_MSI_ENABLED)) {
1912                 if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
1913                         gpie = (IXGBE_GPIE_MSIX_MODE | IXGBE_GPIE_EIAME |
1914                                 IXGBE_GPIE_PBA_SUPPORT | IXGBE_GPIE_OCD);
1915                 } else {
1916                         /* MSI only */
1917                         gpie = 0;
1918                 }
1919                 /* XXX: to interrupt immediately for EICS writes, enable this */
1920                 /* gpie |= IXGBE_GPIE_EIMEN; */
1921                 IXGBE_WRITE_REG(hw, IXGBE_GPIE, gpie);
1922         }
1923
1924         if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) {
1925                 /* legacy interrupts, use EIAM to auto-mask when reading EICR,
1926                  * specifically only auto mask tx and rx interrupts */
1927                 IXGBE_WRITE_REG(hw, IXGBE_EIAM, IXGBE_EICS_RTX_QUEUE);
1928         }
1929
1930         mhadd = IXGBE_READ_REG(hw, IXGBE_MHADD);
1931         if (max_frame != (mhadd >> IXGBE_MHADD_MFS_SHIFT)) {
1932                 mhadd &= ~IXGBE_MHADD_MFS_MASK;
1933                 mhadd |= max_frame << IXGBE_MHADD_MFS_SHIFT;
1934
1935                 IXGBE_WRITE_REG(hw, IXGBE_MHADD, mhadd);
1936         }
1937
1938         for (i = 0; i < adapter->num_tx_queues; i++) {
1939                 j = adapter->tx_ring[i].reg_idx;
1940                 txdctl = IXGBE_READ_REG(hw, IXGBE_TXDCTL(j));
1941                 /* enable WTHRESH=8 descriptors, to encourage burst writeback */
1942                 txdctl |= (8 << 16);
1943                 txdctl |= IXGBE_TXDCTL_ENABLE;
1944                 IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(j), txdctl);
1945         }
1946
1947         for (i = 0; i < adapter->num_rx_queues; i++) {
1948                 j = adapter->rx_ring[i].reg_idx;
1949                 rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(j));
1950                 /* enable PTHRESH=32 descriptors (half the internal cache)
1951                  * and HTHRESH=0 descriptors (to minimize latency on fetch),
1952                  * this also removes a pesky rx_no_buffer_count increment */
1953                 rxdctl |= 0x0020;
1954                 rxdctl |= IXGBE_RXDCTL_ENABLE;
1955                 IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(j), rxdctl);
1956         }
1957         /* enable all receives */
1958         rxdctl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
1959         rxdctl |= (IXGBE_RXCTRL_DMBYPS | IXGBE_RXCTRL_RXEN);
1960         IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, rxdctl);
1961
1962         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
1963                 ixgbe_configure_msix(adapter);
1964         else
1965                 ixgbe_configure_msi_and_legacy(adapter);
1966
1967         clear_bit(__IXGBE_DOWN, &adapter->state);
1968         ixgbe_napi_enable_all(adapter);
1969
1970         /* clear any pending interrupts, may auto mask */
1971         IXGBE_READ_REG(hw, IXGBE_EICR);
1972
1973         ixgbe_irq_enable(adapter);
1974
1975         /* bring the link up in the watchdog, this could race with our first
1976          * link up interrupt but shouldn't be a problem */
1977         adapter->flags |= IXGBE_FLAG_NEED_LINK_UPDATE;
1978         adapter->link_check_timeout = jiffies;
1979         mod_timer(&adapter->watchdog_timer, jiffies);
1980         return 0;
1981 }
1982
1983 void ixgbe_reinit_locked(struct ixgbe_adapter *adapter)
1984 {
1985         WARN_ON(in_interrupt());
1986         while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
1987                 msleep(1);
1988         ixgbe_down(adapter);
1989         ixgbe_up(adapter);
1990         clear_bit(__IXGBE_RESETTING, &adapter->state);
1991 }
1992
1993 int ixgbe_up(struct ixgbe_adapter *adapter)
1994 {
1995         /* hardware has been reset, we need to reload some things */
1996         ixgbe_configure(adapter);
1997
1998         return ixgbe_up_complete(adapter);
1999 }
2000
2001 void ixgbe_reset(struct ixgbe_adapter *adapter)
2002 {
2003         struct ixgbe_hw *hw = &adapter->hw;
2004         if (hw->mac.ops.init_hw(hw))
2005                 dev_err(&adapter->pdev->dev, "Hardware Error\n");
2006
2007         /* reprogram the RAR[0] in case user changed it. */
2008         hw->mac.ops.set_rar(hw, 0, hw->mac.addr, 0, IXGBE_RAH_AV);
2009
2010 }
2011
2012 /**
2013  * ixgbe_clean_rx_ring - Free Rx Buffers per Queue
2014  * @adapter: board private structure
2015  * @rx_ring: ring to free buffers from
2016  **/
2017 static void ixgbe_clean_rx_ring(struct ixgbe_adapter *adapter,
2018                                 struct ixgbe_ring *rx_ring)
2019 {
2020         struct pci_dev *pdev = adapter->pdev;
2021         unsigned long size;
2022         unsigned int i;
2023
2024         /* Free all the Rx ring sk_buffs */
2025
2026         for (i = 0; i < rx_ring->count; i++) {
2027                 struct ixgbe_rx_buffer *rx_buffer_info;
2028
2029                 rx_buffer_info = &rx_ring->rx_buffer_info[i];
2030                 if (rx_buffer_info->dma) {
2031                         pci_unmap_single(pdev, rx_buffer_info->dma,
2032                                          rx_ring->rx_buf_len,
2033                                          PCI_DMA_FROMDEVICE);
2034                         rx_buffer_info->dma = 0;
2035                 }
2036                 if (rx_buffer_info->skb) {
2037                         dev_kfree_skb(rx_buffer_info->skb);
2038                         rx_buffer_info->skb = NULL;
2039                 }
2040                 if (!rx_buffer_info->page)
2041                         continue;
2042                 pci_unmap_page(pdev, rx_buffer_info->page_dma, PAGE_SIZE / 2,
2043                                PCI_DMA_FROMDEVICE);
2044                 rx_buffer_info->page_dma = 0;
2045                 put_page(rx_buffer_info->page);
2046                 rx_buffer_info->page = NULL;
2047                 rx_buffer_info->page_offset = 0;
2048         }
2049
2050         size = sizeof(struct ixgbe_rx_buffer) * rx_ring->count;
2051         memset(rx_ring->rx_buffer_info, 0, size);
2052
2053         /* Zero out the descriptor ring */
2054         memset(rx_ring->desc, 0, rx_ring->size);
2055
2056         rx_ring->next_to_clean = 0;
2057         rx_ring->next_to_use = 0;
2058
2059         writel(0, adapter->hw.hw_addr + rx_ring->head);
2060         writel(0, adapter->hw.hw_addr + rx_ring->tail);
2061 }
2062
2063 /**
2064  * ixgbe_clean_tx_ring - Free Tx Buffers
2065  * @adapter: board private structure
2066  * @tx_ring: ring to be cleaned
2067  **/
2068 static void ixgbe_clean_tx_ring(struct ixgbe_adapter *adapter,
2069                                 struct ixgbe_ring *tx_ring)
2070 {
2071         struct ixgbe_tx_buffer *tx_buffer_info;
2072         unsigned long size;
2073         unsigned int i;
2074
2075         /* Free all the Tx ring sk_buffs */
2076
2077         for (i = 0; i < tx_ring->count; i++) {
2078                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
2079                 ixgbe_unmap_and_free_tx_resource(adapter, tx_buffer_info);
2080         }
2081
2082         size = sizeof(struct ixgbe_tx_buffer) * tx_ring->count;
2083         memset(tx_ring->tx_buffer_info, 0, size);
2084
2085         /* Zero out the descriptor ring */
2086         memset(tx_ring->desc, 0, tx_ring->size);
2087
2088         tx_ring->next_to_use = 0;
2089         tx_ring->next_to_clean = 0;
2090
2091         writel(0, adapter->hw.hw_addr + tx_ring->head);
2092         writel(0, adapter->hw.hw_addr + tx_ring->tail);
2093 }
2094
2095 /**
2096  * ixgbe_clean_all_rx_rings - Free Rx Buffers for all queues
2097  * @adapter: board private structure
2098  **/
2099 static void ixgbe_clean_all_rx_rings(struct ixgbe_adapter *adapter)
2100 {
2101         int i;
2102
2103         for (i = 0; i < adapter->num_rx_queues; i++)
2104                 ixgbe_clean_rx_ring(adapter, &adapter->rx_ring[i]);
2105 }
2106
2107 /**
2108  * ixgbe_clean_all_tx_rings - Free Tx Buffers for all queues
2109  * @adapter: board private structure
2110  **/
2111 static void ixgbe_clean_all_tx_rings(struct ixgbe_adapter *adapter)
2112 {
2113         int i;
2114
2115         for (i = 0; i < adapter->num_tx_queues; i++)
2116                 ixgbe_clean_tx_ring(adapter, &adapter->tx_ring[i]);
2117 }
2118
2119 void ixgbe_down(struct ixgbe_adapter *adapter)
2120 {
2121         struct net_device *netdev = adapter->netdev;
2122         struct ixgbe_hw *hw = &adapter->hw;
2123         u32 rxctrl;
2124         u32 txdctl;
2125         int i, j;
2126
2127         /* signal that we are down to the interrupt handler */
2128         set_bit(__IXGBE_DOWN, &adapter->state);
2129
2130         /* disable receives */
2131         rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
2132         IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, rxctrl & ~IXGBE_RXCTRL_RXEN);
2133
2134         netif_tx_disable(netdev);
2135
2136         IXGBE_WRITE_FLUSH(hw);
2137         msleep(10);
2138
2139         netif_tx_stop_all_queues(netdev);
2140
2141         ixgbe_irq_disable(adapter);
2142
2143         ixgbe_napi_disable_all(adapter);
2144
2145         del_timer_sync(&adapter->watchdog_timer);
2146         cancel_work_sync(&adapter->watchdog_task);
2147
2148         /* disable transmits in the hardware now that interrupts are off */
2149         for (i = 0; i < adapter->num_tx_queues; i++) {
2150                 j = adapter->tx_ring[i].reg_idx;
2151                 txdctl = IXGBE_READ_REG(hw, IXGBE_TXDCTL(j));
2152                 IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(j),
2153                                 (txdctl & ~IXGBE_TXDCTL_ENABLE));
2154         }
2155
2156         netif_carrier_off(netdev);
2157
2158 #ifdef CONFIG_IXGBE_DCA
2159         if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
2160                 adapter->flags &= ~IXGBE_FLAG_DCA_ENABLED;
2161                 dca_remove_requester(&adapter->pdev->dev);
2162         }
2163
2164 #endif
2165         if (!pci_channel_offline(adapter->pdev))
2166                 ixgbe_reset(adapter);
2167         ixgbe_clean_all_tx_rings(adapter);
2168         ixgbe_clean_all_rx_rings(adapter);
2169
2170 #ifdef CONFIG_IXGBE_DCA
2171         /* since we reset the hardware DCA settings were cleared */
2172         if (dca_add_requester(&adapter->pdev->dev) == 0) {
2173                 adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
2174                 /* always use CB2 mode, difference is masked
2175                  * in the CB driver */
2176                 IXGBE_WRITE_REG(hw, IXGBE_DCA_CTRL, 2);
2177                 ixgbe_setup_dca(adapter);
2178         }
2179 #endif
2180 }
2181
2182 /**
2183  * ixgbe_poll - NAPI Rx polling callback
2184  * @napi: structure for representing this polling device
2185  * @budget: how many packets driver is allowed to clean
2186  *
2187  * This function is used for legacy and MSI, NAPI mode
2188  **/
2189 static int ixgbe_poll(struct napi_struct *napi, int budget)
2190 {
2191         struct ixgbe_q_vector *q_vector = container_of(napi,
2192                                                   struct ixgbe_q_vector, napi);
2193         struct ixgbe_adapter *adapter = q_vector->adapter;
2194         int tx_cleaned, work_done = 0;
2195
2196 #ifdef CONFIG_IXGBE_DCA
2197         if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
2198                 ixgbe_update_tx_dca(adapter, adapter->tx_ring);
2199                 ixgbe_update_rx_dca(adapter, adapter->rx_ring);
2200         }
2201 #endif
2202
2203         tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
2204         ixgbe_clean_rx_irq(adapter, adapter->rx_ring, &work_done, budget);
2205
2206         if (tx_cleaned)
2207                 work_done = budget;
2208
2209         /* If budget not fully consumed, exit the polling mode */
2210         if (work_done < budget) {
2211                 netif_rx_complete(adapter->netdev, napi);
2212                 if (adapter->itr_setting & 3)
2213                         ixgbe_set_itr(adapter);
2214                 if (!test_bit(__IXGBE_DOWN, &adapter->state))
2215                         ixgbe_irq_enable(adapter);
2216         }
2217         return work_done;
2218 }
2219
2220 /**
2221  * ixgbe_tx_timeout - Respond to a Tx Hang
2222  * @netdev: network interface device structure
2223  **/
2224 static void ixgbe_tx_timeout(struct net_device *netdev)
2225 {
2226         struct ixgbe_adapter *adapter = netdev_priv(netdev);
2227
2228         /* Do the reset outside of interrupt context */
2229         schedule_work(&adapter->reset_task);
2230 }
2231
2232 static void ixgbe_reset_task(struct work_struct *work)
2233 {
2234         struct ixgbe_adapter *adapter;
2235         adapter = container_of(work, struct ixgbe_adapter, reset_task);
2236
2237         adapter->tx_timeout_count++;
2238
2239         ixgbe_reinit_locked(adapter);
2240 }
2241
2242 static void ixgbe_set_num_queues(struct ixgbe_adapter *adapter)
2243 {
2244         int nrq = 1, ntq = 1;
2245         int feature_mask = 0, rss_i, rss_m;
2246
2247         /* Number of supported queues */
2248         switch (adapter->hw.mac.type) {
2249         case ixgbe_mac_82598EB:
2250                 rss_i = adapter->ring_feature[RING_F_RSS].indices;
2251                 rss_m = 0;
2252                 feature_mask |= IXGBE_FLAG_RSS_ENABLED;
2253
2254                 switch (adapter->flags & feature_mask) {
2255                 case (IXGBE_FLAG_RSS_ENABLED):
2256                         rss_m = 0xF;
2257                         nrq = rss_i;
2258                         ntq = rss_i;
2259                         break;
2260                 case 0:
2261                 default:
2262                         rss_i = 0;
2263                         rss_m = 0;
2264                         nrq = 1;
2265                         ntq = 1;
2266                         break;
2267                 }
2268
2269                 adapter->ring_feature[RING_F_RSS].indices = rss_i;
2270                 adapter->ring_feature[RING_F_RSS].mask = rss_m;
2271                 break;
2272         default:
2273                 nrq = 1;
2274                 ntq = 1;
2275                 break;
2276         }
2277
2278         adapter->num_rx_queues = nrq;
2279         adapter->num_tx_queues = ntq;
2280 }
2281
2282 static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
2283                                        int vectors)
2284 {
2285         int err, vector_threshold;
2286
2287         /* We'll want at least 3 (vector_threshold):
2288          * 1) TxQ[0] Cleanup
2289          * 2) RxQ[0] Cleanup
2290          * 3) Other (Link Status Change, etc.)
2291          * 4) TCP Timer (optional)
2292          */
2293         vector_threshold = MIN_MSIX_COUNT;
2294
2295         /* The more we get, the more we will assign to Tx/Rx Cleanup
2296          * for the separate queues...where Rx Cleanup >= Tx Cleanup.
2297          * Right now, we simply care about how many we'll get; we'll
2298          * set them up later while requesting irq's.
2299          */
2300         while (vectors >= vector_threshold) {
2301                 err = pci_enable_msix(adapter->pdev, adapter->msix_entries,
2302                                       vectors);
2303                 if (!err) /* Success in acquiring all requested vectors. */
2304                         break;
2305                 else if (err < 0)
2306                         vectors = 0; /* Nasty failure, quit now */
2307                 else /* err == number of vectors we should try again with */
2308                         vectors = err;
2309         }
2310
2311         if (vectors < vector_threshold) {
2312                 /* Can't allocate enough MSI-X interrupts?  Oh well.
2313                  * This just means we'll go with either a single MSI
2314                  * vector or fall back to legacy interrupts.
2315                  */
2316                 DPRINTK(HW, DEBUG, "Unable to allocate MSI-X interrupts\n");
2317                 adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
2318                 kfree(adapter->msix_entries);
2319                 adapter->msix_entries = NULL;
2320                 adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
2321                 ixgbe_set_num_queues(adapter);
2322         } else {
2323                 adapter->flags |= IXGBE_FLAG_MSIX_ENABLED; /* Woot! */
2324                 adapter->num_msix_vectors = vectors;
2325         }
2326 }
2327
2328 /**
2329  * ixgbe_cache_ring_register - Descriptor ring to register mapping
2330  * @adapter: board private structure to initialize
2331  *
2332  * Once we know the feature-set enabled for the device, we'll cache
2333  * the register offset the descriptor ring is assigned to.
2334  **/
2335 static void __devinit ixgbe_cache_ring_register(struct ixgbe_adapter *adapter)
2336 {
2337         int feature_mask = 0, rss_i;
2338         int i, txr_idx, rxr_idx;
2339
2340         /* Number of supported queues */
2341         switch (adapter->hw.mac.type) {
2342         case ixgbe_mac_82598EB:
2343                 rss_i = adapter->ring_feature[RING_F_RSS].indices;
2344                 txr_idx = 0;
2345                 rxr_idx = 0;
2346                 feature_mask |= IXGBE_FLAG_RSS_ENABLED;
2347                 switch (adapter->flags & feature_mask) {
2348                 case (IXGBE_FLAG_RSS_ENABLED):
2349                         for (i = 0; i < adapter->num_rx_queues; i++)
2350                                 adapter->rx_ring[i].reg_idx = i;
2351                         for (i = 0; i < adapter->num_tx_queues; i++)
2352                                 adapter->tx_ring[i].reg_idx = i;
2353                         break;
2354                 case 0:
2355                 default:
2356                         break;
2357                 }
2358                 break;
2359         default:
2360                 break;
2361         }
2362 }
2363
2364 /**
2365  * ixgbe_alloc_queues - Allocate memory for all rings
2366  * @adapter: board private structure to initialize
2367  *
2368  * We allocate one ring per queue at run-time since we don't know the
2369  * number of queues at compile-time.  The polling_netdev array is
2370  * intended for Multiqueue, but should work fine with a single queue.
2371  **/
2372 static int __devinit ixgbe_alloc_queues(struct ixgbe_adapter *adapter)
2373 {
2374         int i;
2375
2376         adapter->tx_ring = kcalloc(adapter->num_tx_queues,
2377                                    sizeof(struct ixgbe_ring), GFP_KERNEL);
2378         if (!adapter->tx_ring)
2379                 goto err_tx_ring_allocation;
2380
2381         adapter->rx_ring = kcalloc(adapter->num_rx_queues,
2382                                    sizeof(struct ixgbe_ring), GFP_KERNEL);
2383         if (!adapter->rx_ring)
2384                 goto err_rx_ring_allocation;
2385
2386         for (i = 0; i < adapter->num_tx_queues; i++) {
2387                 adapter->tx_ring[i].count = adapter->tx_ring_count;
2388                 adapter->tx_ring[i].queue_index = i;
2389         }
2390
2391         for (i = 0; i < adapter->num_rx_queues; i++) {
2392                 adapter->rx_ring[i].count = adapter->rx_ring_count;
2393                 adapter->rx_ring[i].queue_index = i;
2394         }
2395
2396         ixgbe_cache_ring_register(adapter);
2397
2398         return 0;
2399
2400 err_rx_ring_allocation:
2401         kfree(adapter->tx_ring);
2402 err_tx_ring_allocation:
2403         return -ENOMEM;
2404 }
2405
2406 /**
2407  * ixgbe_set_interrupt_capability - set MSI-X or MSI if supported
2408  * @adapter: board private structure to initialize
2409  *
2410  * Attempt to configure the interrupts using the best available
2411  * capabilities of the hardware and the kernel.
2412  **/
2413 static int __devinit ixgbe_set_interrupt_capability(struct ixgbe_adapter
2414                                                     *adapter)
2415 {
2416         int err = 0;
2417         int vector, v_budget;
2418
2419         /*
2420          * It's easy to be greedy for MSI-X vectors, but it really
2421          * doesn't do us much good if we have a lot more vectors
2422          * than CPU's.  So let's be conservative and only ask for
2423          * (roughly) twice the number of vectors as there are CPU's.
2424          */
2425         v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
2426                        (int)(num_online_cpus() * 2)) + NON_Q_VECTORS;
2427
2428         /*
2429          * At the same time, hardware can only support a maximum of
2430          * MAX_MSIX_COUNT vectors.  With features such as RSS and VMDq,
2431          * we can easily reach upwards of 64 Rx descriptor queues and
2432          * 32 Tx queues.  Thus, we cap it off in those rare cases where
2433          * the cpu count also exceeds our vector limit.
2434          */
2435         v_budget = min(v_budget, MAX_MSIX_COUNT);
2436
2437         /* A failure in MSI-X entry allocation isn't fatal, but it does
2438          * mean we disable MSI-X capabilities of the adapter. */
2439         adapter->msix_entries = kcalloc(v_budget,
2440                                         sizeof(struct msix_entry), GFP_KERNEL);
2441         if (!adapter->msix_entries) {
2442                 adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
2443                 ixgbe_set_num_queues(adapter);
2444                 kfree(adapter->tx_ring);
2445                 kfree(adapter->rx_ring);
2446                 err = ixgbe_alloc_queues(adapter);
2447                 if (err) {
2448                         DPRINTK(PROBE, ERR, "Unable to allocate memory "
2449                                 "for queues\n");
2450                         goto out;
2451                 }
2452
2453                 goto try_msi;
2454         }
2455
2456         for (vector = 0; vector < v_budget; vector++)
2457                 adapter->msix_entries[vector].entry = vector;
2458
2459         ixgbe_acquire_msix_vectors(adapter, v_budget);
2460
2461         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
2462                 goto out;
2463
2464 try_msi:
2465         err = pci_enable_msi(adapter->pdev);
2466         if (!err) {
2467                 adapter->flags |= IXGBE_FLAG_MSI_ENABLED;
2468         } else {
2469                 DPRINTK(HW, DEBUG, "Unable to allocate MSI interrupt, "
2470                         "falling back to legacy.  Error: %d\n", err);
2471                 /* reset err */
2472                 err = 0;
2473         }
2474
2475 out:
2476         /* Notify the stack of the (possibly) reduced Tx Queue count. */
2477         adapter->netdev->real_num_tx_queues = adapter->num_tx_queues;
2478
2479         return err;
2480 }
2481
2482 static void ixgbe_reset_interrupt_capability(struct ixgbe_adapter *adapter)
2483 {
2484         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
2485                 adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
2486                 pci_disable_msix(adapter->pdev);
2487                 kfree(adapter->msix_entries);
2488                 adapter->msix_entries = NULL;
2489         } else if (adapter->flags & IXGBE_FLAG_MSI_ENABLED) {
2490                 adapter->flags &= ~IXGBE_FLAG_MSI_ENABLED;
2491                 pci_disable_msi(adapter->pdev);
2492         }
2493         return;
2494 }
2495
2496 /**
2497  * ixgbe_init_interrupt_scheme - Determine proper interrupt scheme
2498  * @adapter: board private structure to initialize
2499  *
2500  * We determine which interrupt scheme to use based on...
2501  * - Kernel support (MSI, MSI-X)
2502  *   - which can be user-defined (via MODULE_PARAM)
2503  * - Hardware queue count (num_*_queues)
2504  *   - defined by miscellaneous hardware support/features (RSS, etc.)
2505  **/
2506 static int __devinit ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter)
2507 {
2508         int err;
2509
2510         /* Number of supported queues */
2511         ixgbe_set_num_queues(adapter);
2512
2513         err = ixgbe_alloc_queues(adapter);
2514         if (err) {
2515                 DPRINTK(PROBE, ERR, "Unable to allocate memory for queues\n");
2516                 goto err_alloc_queues;
2517         }
2518
2519         err = ixgbe_set_interrupt_capability(adapter);
2520         if (err) {
2521                 DPRINTK(PROBE, ERR, "Unable to setup interrupt capabilities\n");
2522                 goto err_set_interrupt;
2523         }
2524
2525         DPRINTK(DRV, INFO, "Multiqueue %s: Rx Queue count = %u, "
2526                 "Tx Queue count = %u\n",
2527                 (adapter->num_rx_queues > 1) ? "Enabled" :
2528                 "Disabled", adapter->num_rx_queues, adapter->num_tx_queues);
2529
2530         set_bit(__IXGBE_DOWN, &adapter->state);
2531
2532         return 0;
2533
2534 err_set_interrupt:
2535         kfree(adapter->tx_ring);
2536         kfree(adapter->rx_ring);
2537 err_alloc_queues:
2538         return err;
2539 }
2540
2541 /**
2542  * ixgbe_sw_init - Initialize general software structures (struct ixgbe_adapter)
2543  * @adapter: board private structure to initialize
2544  *
2545  * ixgbe_sw_init initializes the Adapter private data structure.
2546  * Fields are initialized based on PCI device information and
2547  * OS network device settings (MTU size).
2548  **/
2549 static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
2550 {
2551         struct ixgbe_hw *hw = &adapter->hw;
2552         struct pci_dev *pdev = adapter->pdev;
2553         unsigned int rss;
2554
2555         /* PCI config space info */
2556
2557         hw->vendor_id = pdev->vendor;
2558         hw->device_id = pdev->device;
2559         hw->revision_id = pdev->revision;
2560         hw->subsystem_vendor_id = pdev->subsystem_vendor;
2561         hw->subsystem_device_id = pdev->subsystem_device;
2562
2563         /* Set capability flags */
2564         rss = min(IXGBE_MAX_RSS_INDICES, (int)num_online_cpus());
2565         adapter->ring_feature[RING_F_RSS].indices = rss;
2566         adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
2567
2568         /* default flow control settings */
2569         hw->fc.original_type = ixgbe_fc_none;
2570         hw->fc.type = ixgbe_fc_none;
2571         hw->fc.high_water = IXGBE_DEFAULT_FCRTH;
2572         hw->fc.low_water = IXGBE_DEFAULT_FCRTL;
2573         hw->fc.pause_time = IXGBE_DEFAULT_FCPAUSE;
2574         hw->fc.send_xon = true;
2575
2576         /* select 10G link by default */
2577         hw->mac.link_mode_select = IXGBE_AUTOC_LMS_10G_LINK_NO_AN;
2578
2579         /* enable itr by default in dynamic mode */
2580         adapter->itr_setting = 1;
2581         adapter->eitr_param = 20000;
2582
2583         /* set defaults for eitr in MegaBytes */
2584         adapter->eitr_low = 10;
2585         adapter->eitr_high = 20;
2586
2587         /* set default ring sizes */
2588         adapter->tx_ring_count = IXGBE_DEFAULT_TXD;
2589         adapter->rx_ring_count = IXGBE_DEFAULT_RXD;
2590
2591         /* initialize eeprom parameters */
2592         if (ixgbe_init_eeprom_params_generic(hw)) {
2593                 dev_err(&pdev->dev, "EEPROM initialization failed\n");
2594                 return -EIO;
2595         }
2596
2597         /* enable rx csum by default */
2598         adapter->flags |= IXGBE_FLAG_RX_CSUM_ENABLED;
2599
2600         set_bit(__IXGBE_DOWN, &adapter->state);
2601
2602         return 0;
2603 }
2604
2605 /**
2606  * ixgbe_setup_tx_resources - allocate Tx resources (Descriptors)
2607  * @adapter: board private structure
2608  * @tx_ring:    tx descriptor ring (for a specific queue) to setup
2609  *
2610  * Return 0 on success, negative on failure
2611  **/
2612 int ixgbe_setup_tx_resources(struct ixgbe_adapter *adapter,
2613                              struct ixgbe_ring *tx_ring)
2614 {
2615         struct pci_dev *pdev = adapter->pdev;
2616         int size;
2617
2618         size = sizeof(struct ixgbe_tx_buffer) * tx_ring->count;
2619         tx_ring->tx_buffer_info = vmalloc(size);
2620         if (!tx_ring->tx_buffer_info)
2621                 goto err;
2622         memset(tx_ring->tx_buffer_info, 0, size);
2623
2624         /* round up to nearest 4K */
2625         tx_ring->size = tx_ring->count * sizeof(union ixgbe_adv_tx_desc) +
2626                         sizeof(u32);
2627         tx_ring->size = ALIGN(tx_ring->size, 4096);
2628
2629         tx_ring->desc = pci_alloc_consistent(pdev, tx_ring->size,
2630                                              &tx_ring->dma);
2631         if (!tx_ring->desc)
2632                 goto err;
2633
2634         tx_ring->next_to_use = 0;
2635         tx_ring->next_to_clean = 0;
2636         tx_ring->work_limit = tx_ring->count;
2637         return 0;
2638
2639 err:
2640         vfree(tx_ring->tx_buffer_info);
2641         tx_ring->tx_buffer_info = NULL;
2642         DPRINTK(PROBE, ERR, "Unable to allocate memory for the transmit "
2643                             "descriptor ring\n");
2644         return -ENOMEM;
2645 }
2646
2647 /**
2648  * ixgbe_setup_all_tx_resources - allocate all queues Tx resources
2649  * @adapter: board private structure
2650  *
2651  * If this function returns with an error, then it's possible one or
2652  * more of the rings is populated (while the rest are not).  It is the
2653  * callers duty to clean those orphaned rings.
2654  *
2655  * Return 0 on success, negative on failure
2656  **/
2657 static int ixgbe_setup_all_tx_resources(struct ixgbe_adapter *adapter)
2658 {
2659         int i, err = 0;
2660
2661         for (i = 0; i < adapter->num_tx_queues; i++) {
2662                 err = ixgbe_setup_tx_resources(adapter, &adapter->tx_ring[i]);
2663                 if (!err)
2664                         continue;
2665                 DPRINTK(PROBE, ERR, "Allocation for Tx Queue %u failed\n", i);
2666                 break;
2667         }
2668
2669         return err;
2670 }
2671
2672 /**
2673  * ixgbe_setup_rx_resources - allocate Rx resources (Descriptors)
2674  * @adapter: board private structure
2675  * @rx_ring:    rx descriptor ring (for a specific queue) to setup
2676  *
2677  * Returns 0 on success, negative on failure
2678  **/
2679 int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
2680                              struct ixgbe_ring *rx_ring)
2681 {
2682         struct pci_dev *pdev = adapter->pdev;
2683         int size;
2684
2685         size = sizeof(struct net_lro_desc) * IXGBE_MAX_LRO_DESCRIPTORS;
2686         rx_ring->lro_mgr.lro_arr = vmalloc(size);
2687         if (!rx_ring->lro_mgr.lro_arr)
2688                 return -ENOMEM;
2689         memset(rx_ring->lro_mgr.lro_arr, 0, size);
2690
2691         size = sizeof(struct ixgbe_rx_buffer) * rx_ring->count;
2692         rx_ring->rx_buffer_info = vmalloc(size);
2693         if (!rx_ring->rx_buffer_info) {
2694                 DPRINTK(PROBE, ERR,
2695                         "vmalloc allocation failed for the rx desc ring\n");
2696                 goto alloc_failed;
2697         }
2698         memset(rx_ring->rx_buffer_info, 0, size);
2699
2700         /* Round up to nearest 4K */
2701         rx_ring->size = rx_ring->count * sizeof(union ixgbe_adv_rx_desc);
2702         rx_ring->size = ALIGN(rx_ring->size, 4096);
2703
2704         rx_ring->desc = pci_alloc_consistent(pdev, rx_ring->size, &rx_ring->dma);
2705
2706         if (!rx_ring->desc) {
2707                 DPRINTK(PROBE, ERR,
2708                         "Memory allocation failed for the rx desc ring\n");
2709                 vfree(rx_ring->rx_buffer_info);
2710                 goto alloc_failed;
2711         }
2712
2713         rx_ring->next_to_clean = 0;
2714         rx_ring->next_to_use = 0;
2715
2716         return 0;
2717
2718 alloc_failed:
2719         vfree(rx_ring->lro_mgr.lro_arr);
2720         rx_ring->lro_mgr.lro_arr = NULL;
2721         return -ENOMEM;
2722 }
2723
2724 /**
2725  * ixgbe_setup_all_rx_resources - allocate all queues Rx resources
2726  * @adapter: board private structure
2727  *
2728  * If this function returns with an error, then it's possible one or
2729  * more of the rings is populated (while the rest are not).  It is the
2730  * callers duty to clean those orphaned rings.
2731  *
2732  * Return 0 on success, negative on failure
2733  **/
2734
2735 static int ixgbe_setup_all_rx_resources(struct ixgbe_adapter *adapter)
2736 {
2737         int i, err = 0;
2738
2739         for (i = 0; i < adapter->num_rx_queues; i++) {
2740                 err = ixgbe_setup_rx_resources(adapter, &adapter->rx_ring[i]);
2741                 if (!err)
2742                         continue;
2743                 DPRINTK(PROBE, ERR, "Allocation for Rx Queue %u failed\n", i);
2744                 break;
2745         }
2746
2747         return err;
2748 }
2749
2750 /**
2751  * ixgbe_free_tx_resources - Free Tx Resources per Queue
2752  * @adapter: board private structure
2753  * @tx_ring: Tx descriptor ring for a specific queue
2754  *
2755  * Free all transmit software resources
2756  **/
2757 void ixgbe_free_tx_resources(struct ixgbe_adapter *adapter,
2758                              struct ixgbe_ring *tx_ring)
2759 {
2760         struct pci_dev *pdev = adapter->pdev;
2761
2762         ixgbe_clean_tx_ring(adapter, tx_ring);
2763
2764         vfree(tx_ring->tx_buffer_info);
2765         tx_ring->tx_buffer_info = NULL;
2766
2767         pci_free_consistent(pdev, tx_ring->size, tx_ring->desc, tx_ring->dma);
2768
2769         tx_ring->desc = NULL;
2770 }
2771
2772 /**
2773  * ixgbe_free_all_tx_resources - Free Tx Resources for All Queues
2774  * @adapter: board private structure
2775  *
2776  * Free all transmit software resources
2777  **/
2778 static void ixgbe_free_all_tx_resources(struct ixgbe_adapter *adapter)
2779 {
2780         int i;
2781
2782         for (i = 0; i < adapter->num_tx_queues; i++)
2783                 ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
2784 }
2785
2786 /**
2787  * ixgbe_free_rx_resources - Free Rx Resources
2788  * @adapter: board private structure
2789  * @rx_ring: ring to clean the resources from
2790  *
2791  * Free all receive software resources
2792  **/
2793 void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
2794                              struct ixgbe_ring *rx_ring)
2795 {
2796         struct pci_dev *pdev = adapter->pdev;
2797
2798         vfree(rx_ring->lro_mgr.lro_arr);
2799         rx_ring->lro_mgr.lro_arr = NULL;
2800
2801         ixgbe_clean_rx_ring(adapter, rx_ring);
2802
2803         vfree(rx_ring->rx_buffer_info);
2804         rx_ring->rx_buffer_info = NULL;
2805
2806         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
2807
2808         rx_ring->desc = NULL;
2809 }
2810
2811 /**
2812  * ixgbe_free_all_rx_resources - Free Rx Resources for All Queues
2813  * @adapter: board private structure
2814  *
2815  * Free all receive software resources
2816  **/
2817 static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter)
2818 {
2819         int i;
2820
2821         for (i = 0; i < adapter->num_rx_queues; i++)
2822                 ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
2823 }
2824
2825 /**
2826  * ixgbe_change_mtu - Change the Maximum Transfer Unit
2827  * @netdev: network interface device structure
2828  * @new_mtu: new value for maximum frame size
2829  *
2830  * Returns 0 on success, negative on failure
2831  **/
2832 static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
2833 {
2834         struct ixgbe_adapter *adapter = netdev_priv(netdev);
2835         int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
2836
2837         /* MTU < 68 is an error and causes problems on some kernels */
2838         if ((new_mtu < 68) || (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE))
2839                 return -EINVAL;
2840
2841         DPRINTK(PROBE, INFO, "changing MTU from %d to %d\n",
2842                 netdev->mtu, new_mtu);
2843         /* must set new MTU before calling down or up */
2844         netdev->mtu = new_mtu;
2845
2846         if (netif_running(netdev))
2847                 ixgbe_reinit_locked(adapter);
2848
2849         return 0;
2850 }
2851
2852 /**
2853  * ixgbe_open - Called when a network interface is made active
2854  * @netdev: network interface device structure
2855  *
2856  * Returns 0 on success, negative value on failure
2857  *
2858  * The open entry point is called when a network interface is made
2859  * active by the system (IFF_UP).  At this point all resources needed
2860  * for transmit and receive operations are allocated, the interrupt
2861  * handler is registered with the OS, the watchdog timer is started,
2862  * and the stack is notified that the interface is ready.
2863  **/
2864 static int ixgbe_open(struct net_device *netdev)
2865 {
2866         struct ixgbe_adapter *adapter = netdev_priv(netdev);
2867         int err;
2868
2869         /* disallow open during test */
2870         if (test_bit(__IXGBE_TESTING, &adapter->state))
2871                 return -EBUSY;
2872
2873         /* allocate transmit descriptors */
2874         err = ixgbe_setup_all_tx_resources(adapter);
2875         if (err)
2876                 goto err_setup_tx;
2877
2878         /* allocate receive descriptors */
2879         err = ixgbe_setup_all_rx_resources(adapter);
2880         if (err)
2881                 goto err_setup_rx;
2882
2883         ixgbe_configure(adapter);
2884
2885         err = ixgbe_request_irq(adapter);
2886         if (err)
2887                 goto err_req_irq;
2888
2889         err = ixgbe_up_complete(adapter);
2890         if (err)
2891                 goto err_up;
2892
2893         netif_tx_start_all_queues(netdev);
2894
2895         return 0;
2896
2897 err_up:
2898         ixgbe_release_hw_control(adapter);
2899         ixgbe_free_irq(adapter);
2900 err_req_irq:
2901         ixgbe_free_all_rx_resources(adapter);
2902 err_setup_rx:
2903         ixgbe_free_all_tx_resources(adapter);
2904 err_setup_tx:
2905         ixgbe_reset(adapter);
2906
2907         return err;
2908 }
2909
2910 /**
2911  * ixgbe_close - Disables a network interface
2912  * @netdev: network interface device structure
2913  *
2914  * Returns 0, this is not allowed to fail
2915  *
2916  * The close entry point is called when an interface is de-activated
2917  * by the OS.  The hardware is still under the drivers control, but
2918  * needs to be disabled.  A global MAC reset is issued to stop the
2919  * hardware, and all transmit and receive resources are freed.
2920  **/
2921 static int ixgbe_close(struct net_device *netdev)
2922 {
2923         struct ixgbe_adapter *adapter = netdev_priv(netdev);
2924
2925         ixgbe_down(adapter);
2926         ixgbe_free_irq(adapter);
2927
2928         ixgbe_free_all_tx_resources(adapter);
2929         ixgbe_free_all_rx_resources(adapter);
2930
2931         ixgbe_release_hw_control(adapter);
2932
2933         return 0;
2934 }
2935
2936 /**
2937  * ixgbe_napi_add_all - prep napi structs for use
2938  * @adapter: private struct
2939  * helper function to napi_add each possible q_vector->napi
2940  */
2941 static void ixgbe_napi_add_all(struct ixgbe_adapter *adapter)
2942 {
2943         int q_idx, q_vectors;
2944         int (*poll)(struct napi_struct *, int);
2945
2946         if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
2947                 poll = &ixgbe_clean_rxonly;
2948                 /* Only enable as many vectors as we have rx queues. */
2949                 q_vectors = adapter->num_rx_queues;
2950         } else {
2951                 poll = &ixgbe_poll;
2952                 /* only one q_vector for legacy modes */
2953                 q_vectors = 1;
2954         }
2955
2956         for (q_idx = 0; q_idx < q_vectors; q_idx++) {
2957                 struct ixgbe_q_vector *q_vector = &adapter->q_vector[q_idx];
2958                 netif_napi_add(adapter->netdev, &q_vector->napi, (*poll), 64);
2959         }
2960 }
2961
2962 static void ixgbe_napi_del_all(struct ixgbe_adapter *adapter)
2963 {
2964         int q_idx;
2965         int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
2966
2967         /* legacy and MSI only use one vector */
2968         if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
2969                 q_vectors = 1;
2970
2971         for (q_idx = 0; q_idx < q_vectors; q_idx++) {
2972                 struct ixgbe_q_vector *q_vector = &adapter->q_vector[q_idx];
2973                 if (!q_vector->rxr_count)
2974                         continue;
2975                 netif_napi_del(&q_vector->napi);
2976         }
2977 }
2978
2979 #ifdef CONFIG_PM
2980 static int ixgbe_resume(struct pci_dev *pdev)
2981 {
2982         struct net_device *netdev = pci_get_drvdata(pdev);
2983         struct ixgbe_adapter *adapter = netdev_priv(netdev);
2984         u32 err;
2985
2986         pci_set_power_state(pdev, PCI_D0);
2987         pci_restore_state(pdev);
2988         err = pci_enable_device(pdev);
2989         if (err) {
2990                 printk(KERN_ERR "ixgbe: Cannot enable PCI device from "
2991                                 "suspend\n");
2992                 return err;
2993         }
2994         pci_set_master(pdev);
2995
2996         pci_enable_wake(pdev, PCI_D3hot, 0);
2997         pci_enable_wake(pdev, PCI_D3cold, 0);
2998
2999         err = ixgbe_init_interrupt_scheme(adapter);
3000         if (err) {
3001                 printk(KERN_ERR "ixgbe: Cannot initialize interrupts for "
3002                                 "device\n");
3003                 return err;
3004         }
3005
3006         ixgbe_napi_add_all(adapter);
3007         ixgbe_reset(adapter);
3008
3009         if (netif_running(netdev)) {
3010                 err = ixgbe_open(adapter->netdev);
3011                 if (err)
3012                         return err;
3013         }
3014
3015         netif_device_attach(netdev);
3016
3017         return 0;
3018 }
3019
3020 #endif /* CONFIG_PM */
3021 static int ixgbe_suspend(struct pci_dev *pdev, pm_message_t state)
3022 {
3023         struct net_device *netdev = pci_get_drvdata(pdev);
3024         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3025 #ifdef CONFIG_PM
3026         int retval = 0;
3027 #endif
3028
3029         netif_device_detach(netdev);
3030
3031         if (netif_running(netdev)) {
3032                 ixgbe_down(adapter);
3033                 ixgbe_free_irq(adapter);
3034                 ixgbe_free_all_tx_resources(adapter);
3035                 ixgbe_free_all_rx_resources(adapter);
3036         }
3037         ixgbe_reset_interrupt_capability(adapter);
3038         ixgbe_napi_del_all(adapter);
3039         kfree(adapter->tx_ring);
3040         kfree(adapter->rx_ring);
3041
3042 #ifdef CONFIG_PM
3043         retval = pci_save_state(pdev);
3044         if (retval)
3045                 return retval;
3046 #endif
3047
3048         pci_enable_wake(pdev, PCI_D3hot, 0);
3049         pci_enable_wake(pdev, PCI_D3cold, 0);
3050
3051         ixgbe_release_hw_control(adapter);
3052
3053         pci_disable_device(pdev);
3054
3055         pci_set_power_state(pdev, pci_choose_state(pdev, state));
3056
3057         return 0;
3058 }
3059
3060 static void ixgbe_shutdown(struct pci_dev *pdev)
3061 {
3062         ixgbe_suspend(pdev, PMSG_SUSPEND);
3063 }
3064
3065 /**
3066  * ixgbe_update_stats - Update the board statistics counters.
3067  * @adapter: board private structure
3068  **/
3069 void ixgbe_update_stats(struct ixgbe_adapter *adapter)
3070 {
3071         struct ixgbe_hw *hw = &adapter->hw;
3072         u64 total_mpc = 0;
3073         u32 i, missed_rx = 0, mpc, bprc, lxon, lxoff, xon_off_tot;
3074
3075         adapter->stats.crcerrs += IXGBE_READ_REG(hw, IXGBE_CRCERRS);
3076         for (i = 0; i < 8; i++) {
3077                 /* for packet buffers not used, the register should read 0 */
3078                 mpc = IXGBE_READ_REG(hw, IXGBE_MPC(i));
3079                 missed_rx += mpc;
3080                 adapter->stats.mpc[i] += mpc;
3081                 total_mpc += adapter->stats.mpc[i];
3082                 adapter->stats.rnbc[i] += IXGBE_READ_REG(hw, IXGBE_RNBC(i));
3083         }
3084         adapter->stats.gprc += IXGBE_READ_REG(hw, IXGBE_GPRC);
3085         /* work around hardware counting issue */
3086         adapter->stats.gprc -= missed_rx;
3087
3088         /* 82598 hardware only has a 32 bit counter in the high register */
3089         adapter->stats.gorc += IXGBE_READ_REG(hw, IXGBE_GORCH);
3090         adapter->stats.gotc += IXGBE_READ_REG(hw, IXGBE_GOTCH);
3091         adapter->stats.tor += IXGBE_READ_REG(hw, IXGBE_TORH);
3092         bprc = IXGBE_READ_REG(hw, IXGBE_BPRC);
3093         adapter->stats.bprc += bprc;
3094         adapter->stats.mprc += IXGBE_READ_REG(hw, IXGBE_MPRC);
3095         adapter->stats.mprc -= bprc;
3096         adapter->stats.roc += IXGBE_READ_REG(hw, IXGBE_ROC);
3097         adapter->stats.prc64 += IXGBE_READ_REG(hw, IXGBE_PRC64);
3098         adapter->stats.prc127 += IXGBE_READ_REG(hw, IXGBE_PRC127);
3099         adapter->stats.prc255 += IXGBE_READ_REG(hw, IXGBE_PRC255);
3100         adapter->stats.prc511 += IXGBE_READ_REG(hw, IXGBE_PRC511);
3101         adapter->stats.prc1023 += IXGBE_READ_REG(hw, IXGBE_PRC1023);
3102         adapter->stats.prc1522 += IXGBE_READ_REG(hw, IXGBE_PRC1522);
3103         adapter->stats.rlec += IXGBE_READ_REG(hw, IXGBE_RLEC);
3104         adapter->stats.lxonrxc += IXGBE_READ_REG(hw, IXGBE_LXONRXC);
3105         adapter->stats.lxoffrxc += IXGBE_READ_REG(hw, IXGBE_LXOFFRXC);
3106         lxon = IXGBE_READ_REG(hw, IXGBE_LXONTXC);
3107         adapter->stats.lxontxc += lxon;
3108         lxoff = IXGBE_READ_REG(hw, IXGBE_LXOFFTXC);
3109         adapter->stats.lxofftxc += lxoff;
3110         adapter->stats.ruc += IXGBE_READ_REG(hw, IXGBE_RUC);
3111         adapter->stats.gptc += IXGBE_READ_REG(hw, IXGBE_GPTC);
3112         adapter->stats.mptc += IXGBE_READ_REG(hw, IXGBE_MPTC);
3113         /*
3114          * 82598 errata - tx of flow control packets is included in tx counters
3115          */
3116         xon_off_tot = lxon + lxoff;
3117         adapter->stats.gptc -= xon_off_tot;
3118         adapter->stats.mptc -= xon_off_tot;
3119         adapter->stats.gotc -= (xon_off_tot * (ETH_ZLEN + ETH_FCS_LEN));
3120         adapter->stats.ruc += IXGBE_READ_REG(hw, IXGBE_RUC);
3121         adapter->stats.rfc += IXGBE_READ_REG(hw, IXGBE_RFC);
3122         adapter->stats.rjc += IXGBE_READ_REG(hw, IXGBE_RJC);
3123         adapter->stats.tpr += IXGBE_READ_REG(hw, IXGBE_TPR);
3124         adapter->stats.ptc64 += IXGBE_READ_REG(hw, IXGBE_PTC64);
3125         adapter->stats.ptc64 -= xon_off_tot;
3126         adapter->stats.ptc127 += IXGBE_READ_REG(hw, IXGBE_PTC127);
3127         adapter->stats.ptc255 += IXGBE_READ_REG(hw, IXGBE_PTC255);
3128         adapter->stats.ptc511 += IXGBE_READ_REG(hw, IXGBE_PTC511);
3129         adapter->stats.ptc1023 += IXGBE_READ_REG(hw, IXGBE_PTC1023);
3130         adapter->stats.ptc1522 += IXGBE_READ_REG(hw, IXGBE_PTC1522);
3131         adapter->stats.bptc += IXGBE_READ_REG(hw, IXGBE_BPTC);
3132
3133         /* Fill out the OS statistics structure */
3134         adapter->net_stats.multicast = adapter->stats.mprc;
3135
3136         /* Rx Errors */
3137         adapter->net_stats.rx_errors = adapter->stats.crcerrs +
3138                                        adapter->stats.rlec;
3139         adapter->net_stats.rx_dropped = 0;
3140         adapter->net_stats.rx_length_errors = adapter->stats.rlec;
3141         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
3142         adapter->net_stats.rx_missed_errors = total_mpc;
3143 }
3144
3145 /**
3146  * ixgbe_watchdog - Timer Call-back
3147  * @data: pointer to adapter cast into an unsigned long
3148  **/
3149 static void ixgbe_watchdog(unsigned long data)
3150 {
3151         struct ixgbe_adapter *adapter = (struct ixgbe_adapter *)data;
3152         struct ixgbe_hw *hw = &adapter->hw;
3153
3154         /* Do the watchdog outside of interrupt context due to the lovely
3155          * delays that some of the newer hardware requires */
3156         if (!test_bit(__IXGBE_DOWN, &adapter->state)) {
3157                 /* Cause software interrupt to ensure rx rings are cleaned */
3158                 if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
3159                         u32 eics =
3160                          (1 << (adapter->num_msix_vectors - NON_Q_VECTORS)) - 1;
3161                         IXGBE_WRITE_REG(hw, IXGBE_EICS, eics);
3162                 } else {
3163                         /* For legacy and MSI interrupts don't set any bits that
3164                          * are enabled for EIAM, because this operation would
3165                          * set *both* EIMS and EICS for any bit in EIAM */
3166                         IXGBE_WRITE_REG(hw, IXGBE_EICS,
3167                                     (IXGBE_EICS_TCP_TIMER | IXGBE_EICS_OTHER));
3168                 }
3169                 /* Reset the timer */
3170                 mod_timer(&adapter->watchdog_timer,
3171                           round_jiffies(jiffies + 2 * HZ));
3172         }
3173
3174         schedule_work(&adapter->watchdog_task);
3175 }
3176
3177 /**
3178  * ixgbe_watchdog_task - worker thread to bring link up
3179  * @work: pointer to work_struct containing our data
3180  **/
3181 static void ixgbe_watchdog_task(struct work_struct *work)
3182 {
3183         struct ixgbe_adapter *adapter = container_of(work,
3184                                                      struct ixgbe_adapter,
3185                                                      watchdog_task);
3186         struct net_device *netdev = adapter->netdev;
3187         struct ixgbe_hw *hw = &adapter->hw;
3188         u32 link_speed = adapter->link_speed;
3189         bool link_up = adapter->link_up;
3190
3191         adapter->flags |= IXGBE_FLAG_IN_WATCHDOG_TASK;
3192
3193         if (adapter->flags & IXGBE_FLAG_NEED_LINK_UPDATE) {
3194                 hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
3195                 if (link_up ||
3196                     time_after(jiffies, (adapter->link_check_timeout +
3197                                          IXGBE_TRY_LINK_TIMEOUT))) {
3198                         IXGBE_WRITE_REG(hw, IXGBE_EIMS, IXGBE_EIMC_LSC);
3199                         adapter->flags &= ~IXGBE_FLAG_NEED_LINK_UPDATE;
3200                 }
3201                 adapter->link_up = link_up;
3202                 adapter->link_speed = link_speed;
3203         }
3204
3205         if (link_up) {
3206                 if (!netif_carrier_ok(netdev)) {
3207                         u32 frctl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
3208                         u32 rmcs = IXGBE_READ_REG(hw, IXGBE_RMCS);
3209 #define FLOW_RX (frctl & IXGBE_FCTRL_RFCE)
3210 #define FLOW_TX (rmcs & IXGBE_RMCS_TFCE_802_3X)
3211                         DPRINTK(LINK, INFO, "NIC Link is Up %s, "
3212                                 "Flow Control: %s\n",
3213                                 (link_speed == IXGBE_LINK_SPEED_10GB_FULL ?
3214                                  "10 Gbps" :
3215                                  (link_speed == IXGBE_LINK_SPEED_1GB_FULL ?
3216                                   "1 Gbps" : "unknown speed")),
3217                                 ((FLOW_RX && FLOW_TX) ? "RX/TX" :
3218                                  (FLOW_RX ? "RX" :
3219                                  (FLOW_TX ? "TX" : "None"))));
3220
3221                         netif_carrier_on(netdev);
3222                         netif_tx_wake_all_queues(netdev);
3223                 } else {
3224                         /* Force detection of hung controller */
3225                         adapter->detect_tx_hung = true;
3226                 }
3227         } else {
3228                 adapter->link_up = false;
3229                 adapter->link_speed = 0;
3230                 if (netif_carrier_ok(netdev)) {
3231                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
3232                         netif_carrier_off(netdev);
3233                         netif_tx_stop_all_queues(netdev);
3234                 }
3235         }
3236
3237         ixgbe_update_stats(adapter);
3238         adapter->flags &= ~IXGBE_FLAG_IN_WATCHDOG_TASK;
3239 }
3240
3241 static int ixgbe_tso(struct ixgbe_adapter *adapter,
3242                      struct ixgbe_ring *tx_ring, struct sk_buff *skb,
3243                      u32 tx_flags, u8 *hdr_len)
3244 {
3245         struct ixgbe_adv_tx_context_desc *context_desc;
3246         unsigned int i;
3247         int err;
3248         struct ixgbe_tx_buffer *tx_buffer_info;
3249         u32 vlan_macip_lens = 0, type_tucmd_mlhl;
3250         u32 mss_l4len_idx, l4len;
3251
3252         if (skb_is_gso(skb)) {
3253                 if (skb_header_cloned(skb)) {
3254                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
3255                         if (err)
3256                                 return err;
3257                 }
3258                 l4len = tcp_hdrlen(skb);
3259                 *hdr_len += l4len;
3260
3261                 if (skb->protocol == htons(ETH_P_IP)) {
3262                         struct iphdr *iph = ip_hdr(skb);
3263                         iph->tot_len = 0;
3264                         iph->check = 0;
3265                         tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
3266                                                                  iph->daddr, 0,
3267                                                                  IPPROTO_TCP,
3268                                                                  0);
3269                         adapter->hw_tso_ctxt++;
3270                 } else if (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6) {
3271                         ipv6_hdr(skb)->payload_len = 0;
3272                         tcp_hdr(skb)->check =
3273                             ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
3274                                              &ipv6_hdr(skb)->daddr,
3275                                              0, IPPROTO_TCP, 0);
3276                         adapter->hw_tso6_ctxt++;
3277                 }
3278
3279                 i = tx_ring->next_to_use;
3280
3281                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
3282                 context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);
3283
3284                 /* VLAN MACLEN IPLEN */
3285                 if (tx_flags & IXGBE_TX_FLAGS_VLAN)
3286                         vlan_macip_lens |=
3287                             (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
3288                 vlan_macip_lens |= ((skb_network_offset(skb)) <<
3289                                     IXGBE_ADVTXD_MACLEN_SHIFT);
3290                 *hdr_len += skb_network_offset(skb);
3291                 vlan_macip_lens |=
3292                     (skb_transport_header(skb) - skb_network_header(skb));
3293                 *hdr_len +=
3294                     (skb_transport_header(skb) - skb_network_header(skb));
3295                 context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
3296                 context_desc->seqnum_seed = 0;
3297
3298                 /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
3299                 type_tucmd_mlhl = (IXGBE_TXD_CMD_DEXT |
3300                                    IXGBE_ADVTXD_DTYP_CTXT);
3301
3302                 if (skb->protocol == htons(ETH_P_IP))
3303                         type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_IPV4;
3304                 type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
3305                 context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);
3306
3307                 /* MSS L4LEN IDX */
3308                 mss_l4len_idx =
3309                     (skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT);
3310                 mss_l4len_idx |= (l4len << IXGBE_ADVTXD_L4LEN_SHIFT);
3311                 /* use index 1 for TSO */
3312                 mss_l4len_idx |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
3313                 context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
3314
3315                 tx_buffer_info->time_stamp = jiffies;
3316                 tx_buffer_info->next_to_watch = i;
3317
3318                 i++;
3319                 if (i == tx_ring->count)
3320                         i = 0;
3321                 tx_ring->next_to_use = i;
3322
3323                 return true;
3324         }
3325         return false;
3326 }
3327
3328 static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
3329                           struct ixgbe_ring *tx_ring,
3330                           struct sk_buff *skb, u32 tx_flags)
3331 {
3332         struct ixgbe_adv_tx_context_desc *context_desc;
3333         unsigned int i;
3334         struct ixgbe_tx_buffer *tx_buffer_info;
3335         u32 vlan_macip_lens = 0, type_tucmd_mlhl = 0;
3336
3337         if (skb->ip_summed == CHECKSUM_PARTIAL ||
3338             (tx_flags & IXGBE_TX_FLAGS_VLAN)) {
3339                 i = tx_ring->next_to_use;
3340                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
3341                 context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);
3342
3343                 if (tx_flags & IXGBE_TX_FLAGS_VLAN)
3344                         vlan_macip_lens |=
3345                             (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
3346                 vlan_macip_lens |= (skb_network_offset(skb) <<
3347                                     IXGBE_ADVTXD_MACLEN_SHIFT);
3348                 if (skb->ip_summed == CHECKSUM_PARTIAL)
3349                         vlan_macip_lens |= (skb_transport_header(skb) -
3350                                             skb_network_header(skb));
3351
3352                 context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
3353                 context_desc->seqnum_seed = 0;
3354
3355                 type_tucmd_mlhl |= (IXGBE_TXD_CMD_DEXT |
3356                                     IXGBE_ADVTXD_DTYP_CTXT);
3357
3358                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3359                         switch (skb->protocol) {
3360                         case __constant_htons(ETH_P_IP):
3361                                 type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_IPV4;
3362                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
3363                                         type_tucmd_mlhl |=
3364                                                 IXGBE_ADVTXD_TUCMD_L4T_TCP;
3365                                 break;
3366                         case __constant_htons(ETH_P_IPV6):
3367                                 /* XXX what about other V6 headers?? */
3368                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
3369                                         type_tucmd_mlhl |=
3370                                                 IXGBE_ADVTXD_TUCMD_L4T_TCP;
3371                                 break;
3372                         default:
3373                                 if (unlikely(net_ratelimit())) {
3374                                         DPRINTK(PROBE, WARNING,
3375                                          "partial checksum but proto=%x!\n",
3376                                          skb->protocol);
3377                                 }
3378                                 break;
3379                         }
3380                 }
3381
3382                 context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);
3383                 /* use index zero for tx checksum offload */
3384                 context_desc->mss_l4len_idx = 0;
3385
3386                 tx_buffer_info->time_stamp = jiffies;
3387                 tx_buffer_info->next_to_watch = i;
3388
3389                 adapter->hw_csum_tx_good++;
3390                 i++;
3391                 if (i == tx_ring->count)
3392                         i = 0;
3393                 tx_ring->next_to_use = i;
3394
3395                 return true;
3396         }
3397
3398         return false;
3399 }
3400
3401 static int ixgbe_tx_map(struct ixgbe_adapter *adapter,
3402                         struct ixgbe_ring *tx_ring,
3403                         struct sk_buff *skb, unsigned int first)
3404 {
3405         struct ixgbe_tx_buffer *tx_buffer_info;
3406         unsigned int len = skb->len;
3407         unsigned int offset = 0, size, count = 0, i;
3408         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
3409         unsigned int f;
3410
3411         len -= skb->data_len;
3412
3413         i = tx_ring->next_to_use;
3414
3415         while (len) {
3416                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
3417                 size = min(len, (uint)IXGBE_MAX_DATA_PER_TXD);
3418
3419                 tx_buffer_info->length = size;
3420                 tx_buffer_info->dma = pci_map_single(adapter->pdev,
3421                                                      skb->data + offset,
3422                                                      size, PCI_DMA_TODEVICE);
3423                 tx_buffer_info->time_stamp = jiffies;
3424                 tx_buffer_info->next_to_watch = i;
3425
3426                 len -= size;
3427                 offset += size;
3428                 count++;
3429                 i++;
3430                 if (i == tx_ring->count)
3431                         i = 0;
3432         }
3433
3434         for (f = 0; f < nr_frags; f++) {
3435                 struct skb_frag_struct *frag;
3436
3437                 frag = &skb_shinfo(skb)->frags[f];
3438                 len = frag->size;
3439                 offset = frag->page_offset;
3440
3441                 while (len) {
3442                         tx_buffer_info = &tx_ring->tx_buffer_info[i];
3443                         size = min(len, (uint)IXGBE_MAX_DATA_PER_TXD);
3444
3445                         tx_buffer_info->length = size;
3446                         tx_buffer_info->dma = pci_map_page(adapter->pdev,
3447                                                            frag->page,
3448                                                            offset,
3449                                                            size,
3450                                                            PCI_DMA_TODEVICE);
3451                         tx_buffer_info->time_stamp = jiffies;
3452                         tx_buffer_info->next_to_watch = i;
3453
3454                         len -= size;
3455                         offset += size;
3456                         count++;
3457                         i++;
3458                         if (i == tx_ring->count)
3459                                 i = 0;
3460                 }
3461         }
3462         if (i == 0)
3463                 i = tx_ring->count - 1;
3464         else
3465                 i = i - 1;
3466         tx_ring->tx_buffer_info[i].skb = skb;
3467         tx_ring->tx_buffer_info[first].next_to_watch = i;
3468
3469         return count;
3470 }
3471
3472 static void ixgbe_tx_queue(struct ixgbe_adapter *adapter,
3473                            struct ixgbe_ring *tx_ring,
3474                            int tx_flags, int count, u32 paylen, u8 hdr_len)
3475 {
3476         union ixgbe_adv_tx_desc *tx_desc = NULL;
3477         struct ixgbe_tx_buffer *tx_buffer_info;
3478         u32 olinfo_status = 0, cmd_type_len = 0;
3479         unsigned int i;
3480         u32 txd_cmd = IXGBE_TXD_CMD_EOP | IXGBE_TXD_CMD_RS | IXGBE_TXD_CMD_IFCS;
3481
3482         cmd_type_len |= IXGBE_ADVTXD_DTYP_DATA;
3483
3484         cmd_type_len |= IXGBE_ADVTXD_DCMD_IFCS | IXGBE_ADVTXD_DCMD_DEXT;
3485
3486         if (tx_flags & IXGBE_TX_FLAGS_VLAN)
3487                 cmd_type_len |= IXGBE_ADVTXD_DCMD_VLE;
3488
3489         if (tx_flags & IXGBE_TX_FLAGS_TSO) {
3490                 cmd_type_len |= IXGBE_ADVTXD_DCMD_TSE;
3491
3492                 olinfo_status |= IXGBE_TXD_POPTS_TXSM <<
3493                                  IXGBE_ADVTXD_POPTS_SHIFT;
3494
3495                 /* use index 1 context for tso */
3496                 olinfo_status |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
3497                 if (tx_flags & IXGBE_TX_FLAGS_IPV4)
3498                         olinfo_status |= IXGBE_TXD_POPTS_IXSM <<
3499                                          IXGBE_ADVTXD_POPTS_SHIFT;
3500
3501         } else if (tx_flags & IXGBE_TX_FLAGS_CSUM)
3502                 olinfo_status |= IXGBE_TXD_POPTS_TXSM <<
3503                                  IXGBE_ADVTXD_POPTS_SHIFT;
3504
3505         olinfo_status |= ((paylen - hdr_len) << IXGBE_ADVTXD_PAYLEN_SHIFT);
3506
3507         i = tx_ring->next_to_use;
3508         while (count--) {
3509                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
3510                 tx_desc = IXGBE_TX_DESC_ADV(*tx_ring, i);
3511                 tx_desc->read.buffer_addr = cpu_to_le64(tx_buffer_info->dma);
3512                 tx_desc->read.cmd_type_len =
3513                         cpu_to_le32(cmd_type_len | tx_buffer_info->length);
3514                 tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
3515                 i++;
3516                 if (i == tx_ring->count)
3517                         i = 0;
3518         }
3519
3520         tx_desc->read.cmd_type_len |= cpu_to_le32(txd_cmd);
3521
3522         /*
3523          * Force memory writes to complete before letting h/w
3524          * know there are new descriptors to fetch.  (Only
3525          * applicable for weak-ordered memory model archs,
3526          * such as IA-64).
3527          */
3528         wmb();
3529
3530         tx_ring->next_to_use = i;
3531         writel(i, adapter->hw.hw_addr + tx_ring->tail);
3532 }
3533
3534 static int __ixgbe_maybe_stop_tx(struct net_device *netdev,
3535                                  struct ixgbe_ring *tx_ring, int size)
3536 {
3537         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3538
3539         netif_stop_subqueue(netdev, tx_ring->queue_index);
3540         /* Herbert's original patch had:
3541          *  smp_mb__after_netif_stop_queue();
3542          * but since that doesn't exist yet, just open code it. */
3543         smp_mb();
3544
3545         /* We need to check again in a case another CPU has just
3546          * made room available. */
3547         if (likely(IXGBE_DESC_UNUSED(tx_ring) < size))
3548                 return -EBUSY;
3549
3550         /* A reprieve! - use start_queue because it doesn't call schedule */
3551         netif_start_subqueue(netdev, tx_ring->queue_index);
3552         ++adapter->restart_queue;
3553         return 0;
3554 }
3555
3556 static int ixgbe_maybe_stop_tx(struct net_device *netdev,
3557                               struct ixgbe_ring *tx_ring, int size)
3558 {
3559         if (likely(IXGBE_DESC_UNUSED(tx_ring) >= size))
3560                 return 0;
3561         return __ixgbe_maybe_stop_tx(netdev, tx_ring, size);
3562 }
3563
3564 static int ixgbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
3565 {
3566         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3567         struct ixgbe_ring *tx_ring;
3568         unsigned int first;
3569         unsigned int tx_flags = 0;
3570         u8 hdr_len = 0;
3571         int r_idx = 0, tso;
3572         int count = 0;
3573         unsigned int f;
3574
3575         r_idx = (adapter->num_tx_queues - 1) & skb->queue_mapping;
3576         tx_ring = &adapter->tx_ring[r_idx];
3577
3578         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
3579                 tx_flags |= vlan_tx_tag_get(skb);
3580                 tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
3581                 tx_flags |= IXGBE_TX_FLAGS_VLAN;
3582         }
3583         /* three things can cause us to need a context descriptor */
3584         if (skb_is_gso(skb) ||
3585             (skb->ip_summed == CHECKSUM_PARTIAL) ||
3586             (tx_flags & IXGBE_TX_FLAGS_VLAN))
3587                 count++;
3588
3589         count += TXD_USE_COUNT(skb_headlen(skb));
3590         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
3591                 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
3592
3593         if (ixgbe_maybe_stop_tx(netdev, tx_ring, count)) {
3594                 adapter->tx_busy++;
3595                 return NETDEV_TX_BUSY;
3596         }
3597
3598         if (skb->protocol == htons(ETH_P_IP))
3599                 tx_flags |= IXGBE_TX_FLAGS_IPV4;
3600         first = tx_ring->next_to_use;
3601         tso = ixgbe_tso(adapter, tx_ring, skb, tx_flags, &hdr_len);
3602         if (tso < 0) {
3603                 dev_kfree_skb_any(skb);
3604                 return NETDEV_TX_OK;
3605         }
3606
3607         if (tso)
3608                 tx_flags |= IXGBE_TX_FLAGS_TSO;
3609         else if (ixgbe_tx_csum(adapter, tx_ring, skb, tx_flags) &&
3610                  (skb->ip_summed == CHECKSUM_PARTIAL))
3611                 tx_flags |= IXGBE_TX_FLAGS_CSUM;
3612
3613         ixgbe_tx_queue(adapter, tx_ring, tx_flags,
3614                        ixgbe_tx_map(adapter, tx_ring, skb, first),
3615                        skb->len, hdr_len);
3616
3617         netdev->trans_start = jiffies;
3618
3619         ixgbe_maybe_stop_tx(netdev, tx_ring, DESC_NEEDED);
3620
3621         return NETDEV_TX_OK;
3622 }
3623
3624 /**
3625  * ixgbe_get_stats - Get System Network Statistics
3626  * @netdev: network interface device structure
3627  *
3628  * Returns the address of the device statistics structure.
3629  * The statistics are actually updated from the timer callback.
3630  **/
3631 static struct net_device_stats *ixgbe_get_stats(struct net_device *netdev)
3632 {
3633         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3634
3635         /* only return the current stats */
3636         return &adapter->net_stats;
3637 }
3638
3639 /**
3640  * ixgbe_set_mac - Change the Ethernet Address of the NIC
3641  * @netdev: network interface device structure
3642  * @p: pointer to an address structure
3643  *
3644  * Returns 0 on success, negative on failure
3645  **/
3646 static int ixgbe_set_mac(struct net_device *netdev, void *p)
3647 {
3648         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3649         struct ixgbe_hw *hw = &adapter->hw;
3650         struct sockaddr *addr = p;
3651
3652         if (!is_valid_ether_addr(addr->sa_data))
3653                 return -EADDRNOTAVAIL;
3654
3655         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
3656         memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
3657
3658         hw->mac.ops.set_rar(hw, 0, hw->mac.addr, 0, IXGBE_RAH_AV);
3659
3660         return 0;
3661 }
3662
3663 #ifdef CONFIG_NET_POLL_CONTROLLER
3664 /*
3665  * Polling 'interrupt' - used by things like netconsole to send skbs
3666  * without having to re-enable interrupts. It's not called while
3667  * the interrupt routine is executing.
3668  */
3669 static void ixgbe_netpoll(struct net_device *netdev)
3670 {
3671         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3672
3673         disable_irq(adapter->pdev->irq);
3674         adapter->flags |= IXGBE_FLAG_IN_NETPOLL;
3675         ixgbe_intr(adapter->pdev->irq, netdev);
3676         adapter->flags &= ~IXGBE_FLAG_IN_NETPOLL;
3677         enable_irq(adapter->pdev->irq);
3678 }
3679 #endif
3680
3681 /**
3682  * ixgbe_link_config - set up initial link with default speed and duplex
3683  * @hw: pointer to private hardware struct
3684  *
3685  * Returns 0 on success, negative on failure
3686  **/
3687 static int ixgbe_link_config(struct ixgbe_hw *hw)
3688 {
3689         u32 autoneg = IXGBE_LINK_SPEED_10GB_FULL;
3690
3691         /* must always autoneg for both 1G and 10G link */
3692         hw->mac.autoneg = true;
3693
3694         return hw->mac.ops.setup_link_speed(hw, autoneg, true, true);
3695 }
3696
3697 /**
3698  * ixgbe_probe - Device Initialization Routine
3699  * @pdev: PCI device information struct
3700  * @ent: entry in ixgbe_pci_tbl
3701  *
3702  * Returns 0 on success, negative on failure
3703  *
3704  * ixgbe_probe initializes an adapter identified by a pci_dev structure.
3705  * The OS initialization, configuring of the adapter private structure,
3706  * and a hardware reset occur.
3707  **/
3708 static int __devinit ixgbe_probe(struct pci_dev *pdev,
3709                                  const struct pci_device_id *ent)
3710 {
3711         struct net_device *netdev;
3712         struct ixgbe_adapter *adapter = NULL;
3713         struct ixgbe_hw *hw;
3714         const struct ixgbe_info *ii = ixgbe_info_tbl[ent->driver_data];
3715         static int cards_found;
3716         int i, err, pci_using_dac;
3717         u16 link_status, link_speed, link_width;
3718         u32 part_num, eec;
3719
3720         err = pci_enable_device(pdev);
3721         if (err)
3722                 return err;
3723
3724         if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK) &&
3725             !pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK)) {
3726                 pci_using_dac = 1;
3727         } else {
3728                 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
3729                 if (err) {
3730                         err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
3731                         if (err) {
3732                                 dev_err(&pdev->dev, "No usable DMA "
3733                                         "configuration, aborting\n");
3734                                 goto err_dma;
3735                         }
3736                 }
3737                 pci_using_dac = 0;
3738         }
3739
3740         err = pci_request_regions(pdev, ixgbe_driver_name);
3741         if (err) {
3742                 dev_err(&pdev->dev, "pci_request_regions failed 0x%x\n", err);
3743                 goto err_pci_reg;
3744         }
3745
3746         pci_set_master(pdev);
3747         pci_save_state(pdev);
3748
3749         netdev = alloc_etherdev_mq(sizeof(struct ixgbe_adapter), MAX_TX_QUEUES);
3750         if (!netdev) {
3751                 err = -ENOMEM;
3752                 goto err_alloc_etherdev;
3753         }
3754
3755         SET_NETDEV_DEV(netdev, &pdev->dev);
3756
3757         pci_set_drvdata(pdev, netdev);
3758         adapter = netdev_priv(netdev);
3759
3760         adapter->netdev = netdev;
3761         adapter->pdev = pdev;
3762         hw = &adapter->hw;
3763         hw->back = adapter;
3764         adapter->msg_enable = (1 << DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
3765
3766         hw->hw_addr = ioremap(pci_resource_start(pdev, 0),
3767                               pci_resource_len(pdev, 0));
3768         if (!hw->hw_addr) {
3769                 err = -EIO;
3770                 goto err_ioremap;
3771         }
3772
3773         for (i = 1; i <= 5; i++) {
3774                 if (pci_resource_len(pdev, i) == 0)
3775                         continue;
3776         }
3777
3778         netdev->open = &ixgbe_open;
3779         netdev->stop = &ixgbe_close;
3780         netdev->hard_start_xmit = &ixgbe_xmit_frame;
3781         netdev->get_stats = &ixgbe_get_stats;
3782         netdev->set_rx_mode = &ixgbe_set_rx_mode;
3783         netdev->set_multicast_list = &ixgbe_set_rx_mode;
3784         netdev->set_mac_address = &ixgbe_set_mac;
3785         netdev->change_mtu = &ixgbe_change_mtu;
3786         ixgbe_set_ethtool_ops(netdev);
3787         netdev->tx_timeout = &ixgbe_tx_timeout;
3788         netdev->watchdog_timeo = 5 * HZ;
3789         netdev->vlan_rx_register = ixgbe_vlan_rx_register;
3790         netdev->vlan_rx_add_vid = ixgbe_vlan_rx_add_vid;
3791         netdev->vlan_rx_kill_vid = ixgbe_vlan_rx_kill_vid;
3792 #ifdef CONFIG_NET_POLL_CONTROLLER
3793         netdev->poll_controller = ixgbe_netpoll;
3794 #endif
3795         strcpy(netdev->name, pci_name(pdev));
3796
3797         adapter->bd_number = cards_found;
3798
3799         /* Setup hw api */
3800         memcpy(&hw->mac.ops, ii->mac_ops, sizeof(hw->mac.ops));
3801         hw->mac.type  = ii->mac;
3802
3803         /* EEPROM */
3804         memcpy(&hw->eeprom.ops, ii->eeprom_ops, sizeof(hw->eeprom.ops));
3805         eec = IXGBE_READ_REG(hw, IXGBE_EEC);
3806         /* If EEPROM is valid (bit 8 = 1), use default otherwise use bit bang */
3807         if (!(eec & (1 << 8)))
3808                 hw->eeprom.ops.read = &ixgbe_read_eeprom_bit_bang_generic;
3809
3810         /* PHY */
3811         memcpy(&hw->phy.ops, ii->phy_ops, sizeof(hw->phy.ops));
3812         /* phy->sfp_type = ixgbe_sfp_type_unknown; */
3813
3814         err = ii->get_invariants(hw);
3815         if (err)
3816                 goto err_hw_init;
3817
3818         /* setup the private structure */
3819         err = ixgbe_sw_init(adapter);
3820         if (err)
3821                 goto err_sw_init;
3822
3823         /* reset_hw fills in the perm_addr as well */
3824         err = hw->mac.ops.reset_hw(hw);
3825         if (err) {
3826                 dev_err(&adapter->pdev->dev, "HW Init failed: %d\n", err);
3827                 goto err_sw_init;
3828         }
3829
3830         netdev->features = NETIF_F_SG |
3831                            NETIF_F_IP_CSUM |
3832                            NETIF_F_HW_VLAN_TX |
3833                            NETIF_F_HW_VLAN_RX |
3834                            NETIF_F_HW_VLAN_FILTER;
3835
3836         netdev->features |= NETIF_F_IPV6_CSUM;
3837         netdev->features |= NETIF_F_TSO;
3838         netdev->features |= NETIF_F_TSO6;
3839         netdev->features |= NETIF_F_LRO;
3840
3841         netdev->vlan_features |= NETIF_F_TSO;
3842         netdev->vlan_features |= NETIF_F_TSO6;
3843         netdev->vlan_features |= NETIF_F_IP_CSUM;
3844         netdev->vlan_features |= NETIF_F_SG;
3845
3846         if (pci_using_dac)
3847                 netdev->features |= NETIF_F_HIGHDMA;
3848
3849         /* make sure the EEPROM is good */
3850         if (hw->eeprom.ops.validate_checksum(hw, NULL) < 0) {
3851                 dev_err(&pdev->dev, "The EEPROM Checksum Is Not Valid\n");
3852                 err = -EIO;
3853                 goto err_eeprom;
3854         }
3855
3856         memcpy(netdev->dev_addr, hw->mac.perm_addr, netdev->addr_len);
3857         memcpy(netdev->perm_addr, hw->mac.perm_addr, netdev->addr_len);
3858
3859         if (ixgbe_validate_mac_addr(netdev->perm_addr)) {
3860                 dev_err(&pdev->dev, "invalid MAC address\n");
3861                 err = -EIO;
3862                 goto err_eeprom;
3863         }
3864
3865         init_timer(&adapter->watchdog_timer);
3866         adapter->watchdog_timer.function = &ixgbe_watchdog;
3867         adapter->watchdog_timer.data = (unsigned long)adapter;
3868
3869         INIT_WORK(&adapter->reset_task, ixgbe_reset_task);
3870         INIT_WORK(&adapter->watchdog_task, ixgbe_watchdog_task);
3871
3872         err = ixgbe_init_interrupt_scheme(adapter);
3873         if (err)
3874                 goto err_sw_init;
3875
3876         /* print bus type/speed/width info */
3877         pci_read_config_word(pdev, IXGBE_PCI_LINK_STATUS, &link_status);
3878         link_speed = link_status & IXGBE_PCI_LINK_SPEED;
3879         link_width = link_status & IXGBE_PCI_LINK_WIDTH;
3880         dev_info(&pdev->dev, "(PCI Express:%s:%s) "
3881                  "%02x:%02x:%02x:%02x:%02x:%02x\n",
3882                 ((link_speed == IXGBE_PCI_LINK_SPEED_5000) ? "5.0Gb/s" :
3883                  (link_speed == IXGBE_PCI_LINK_SPEED_2500) ? "2.5Gb/s" :
3884                  "Unknown"),
3885                 ((link_width == IXGBE_PCI_LINK_WIDTH_8) ? "Width x8" :
3886                  (link_width == IXGBE_PCI_LINK_WIDTH_4) ? "Width x4" :
3887                  (link_width == IXGBE_PCI_LINK_WIDTH_2) ? "Width x2" :
3888                  (link_width == IXGBE_PCI_LINK_WIDTH_1) ? "Width x1" :
3889                  "Unknown"),
3890                 netdev->dev_addr[0], netdev->dev_addr[1], netdev->dev_addr[2],
3891                 netdev->dev_addr[3], netdev->dev_addr[4], netdev->dev_addr[5]);
3892         ixgbe_read_pba_num_generic(hw, &part_num);
3893         dev_info(&pdev->dev, "MAC: %d, PHY: %d, PBA No: %06x-%03x\n",
3894                  hw->mac.type, hw->phy.type,
3895                  (part_num >> 8), (part_num & 0xff));
3896
3897         if (link_width <= IXGBE_PCI_LINK_WIDTH_4) {
3898                 dev_warn(&pdev->dev, "PCI-Express bandwidth available for "
3899                          "this card is not sufficient for optimal "
3900                          "performance.\n");
3901                 dev_warn(&pdev->dev, "For optimal performance a x8 "
3902                          "PCI-Express slot is required.\n");
3903         }
3904
3905         /* reset the hardware with the new settings */
3906         hw->mac.ops.start_hw(hw);
3907
3908         /* link_config depends on start_hw being called at least once */
3909         err = ixgbe_link_config(hw);
3910         if (err) {
3911                 dev_err(&pdev->dev, "setup_link_speed FAILED %d\n", err);
3912                 goto err_register;
3913         }
3914
3915         netif_carrier_off(netdev);
3916         netif_tx_stop_all_queues(netdev);
3917
3918         ixgbe_napi_add_all(adapter);
3919
3920         strcpy(netdev->name, "eth%d");
3921         err = register_netdev(netdev);
3922         if (err)
3923                 goto err_register;
3924
3925 #ifdef CONFIG_IXGBE_DCA
3926         if (dca_add_requester(&pdev->dev) == 0) {
3927                 adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
3928                 /* always use CB2 mode, difference is masked
3929                  * in the CB driver */
3930                 IXGBE_WRITE_REG(hw, IXGBE_DCA_CTRL, 2);
3931                 ixgbe_setup_dca(adapter);
3932         }
3933 #endif
3934
3935         dev_info(&pdev->dev, "Intel(R) 10 Gigabit Network Connection\n");
3936         cards_found++;
3937         return 0;
3938
3939 err_register:
3940         ixgbe_release_hw_control(adapter);
3941 err_hw_init:
3942 err_sw_init:
3943         ixgbe_reset_interrupt_capability(adapter);
3944 err_eeprom:
3945         iounmap(hw->hw_addr);
3946 err_ioremap:
3947         free_netdev(netdev);
3948 err_alloc_etherdev:
3949         pci_release_regions(pdev);
3950 err_pci_reg:
3951 err_dma:
3952         pci_disable_device(pdev);
3953         return err;
3954 }
3955
3956 /**
3957  * ixgbe_remove - Device Removal Routine
3958  * @pdev: PCI device information struct
3959  *
3960  * ixgbe_remove is called by the PCI subsystem to alert the driver
3961  * that it should release a PCI device.  The could be caused by a
3962  * Hot-Plug event, or because the driver is going to be removed from
3963  * memory.
3964  **/
3965 static void __devexit ixgbe_remove(struct pci_dev *pdev)
3966 {
3967         struct net_device *netdev = pci_get_drvdata(pdev);
3968         struct ixgbe_adapter *adapter = netdev_priv(netdev);
3969
3970         set_bit(__IXGBE_DOWN, &adapter->state);
3971         del_timer_sync(&adapter->watchdog_timer);
3972
3973         flush_scheduled_work();
3974
3975 #ifdef CONFIG_IXGBE_DCA
3976         if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
3977                 adapter->flags &= ~IXGBE_FLAG_DCA_ENABLED;
3978                 dca_remove_requester(&pdev->dev);
3979                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 1);
3980         }
3981
3982 #endif
3983         unregister_netdev(netdev);
3984
3985         ixgbe_reset_interrupt_capability(adapter);
3986
3987         ixgbe_release_hw_control(adapter);
3988
3989         iounmap(adapter->hw.hw_addr);
3990         pci_release_regions(pdev);
3991
3992         DPRINTK(PROBE, INFO, "complete\n");
3993         ixgbe_napi_del_all(adapter);
3994         kfree(adapter->tx_ring);
3995         kfree(adapter->rx_ring);
3996
3997         free_netdev(netdev);
3998
3999         pci_disable_device(pdev);
4000 }
4001
4002 /**
4003  * ixgbe_io_error_detected - called when PCI error is detected
4004  * @pdev: Pointer to PCI device
4005  * @state: The current pci connection state
4006  *
4007  * This function is called after a PCI bus error affecting
4008  * this device has been detected.
4009  */
4010 static pci_ers_result_t ixgbe_io_error_detected(struct pci_dev *pdev,
4011                                                 pci_channel_state_t state)
4012 {
4013         struct net_device *netdev = pci_get_drvdata(pdev);
4014         struct ixgbe_adapter *adapter = netdev->priv;
4015
4016         netif_device_detach(netdev);
4017
4018         if (netif_running(netdev))
4019                 ixgbe_down(adapter);
4020         pci_disable_device(pdev);
4021
4022         /* Request a slot reset. */
4023         return PCI_ERS_RESULT_NEED_RESET;
4024 }
4025
4026 /**
4027  * ixgbe_io_slot_reset - called after the pci bus has been reset.
4028  * @pdev: Pointer to PCI device
4029  *
4030  * Restart the card from scratch, as if from a cold-boot.
4031  */
4032 static pci_ers_result_t ixgbe_io_slot_reset(struct pci_dev *pdev)
4033 {
4034         struct net_device *netdev = pci_get_drvdata(pdev);
4035         struct ixgbe_adapter *adapter = netdev->priv;
4036
4037         if (pci_enable_device(pdev)) {
4038                 DPRINTK(PROBE, ERR,
4039                         "Cannot re-enable PCI device after reset.\n");
4040                 return PCI_ERS_RESULT_DISCONNECT;
4041         }
4042         pci_set_master(pdev);
4043         pci_restore_state(pdev);
4044
4045         pci_enable_wake(pdev, PCI_D3hot, 0);
4046         pci_enable_wake(pdev, PCI_D3cold, 0);
4047
4048         ixgbe_reset(adapter);
4049
4050         return PCI_ERS_RESULT_RECOVERED;
4051 }
4052
4053 /**
4054  * ixgbe_io_resume - called when traffic can start flowing again.
4055  * @pdev: Pointer to PCI device
4056  *
4057  * This callback is called when the error recovery driver tells us that
4058  * its OK to resume normal operation.
4059  */
4060 static void ixgbe_io_resume(struct pci_dev *pdev)
4061 {
4062         struct net_device *netdev = pci_get_drvdata(pdev);
4063         struct ixgbe_adapter *adapter = netdev->priv;
4064
4065         if (netif_running(netdev)) {
4066                 if (ixgbe_up(adapter)) {
4067                         DPRINTK(PROBE, INFO, "ixgbe_up failed after reset\n");
4068                         return;
4069                 }
4070         }
4071
4072         netif_device_attach(netdev);
4073 }
4074
4075 static struct pci_error_handlers ixgbe_err_handler = {
4076         .error_detected = ixgbe_io_error_detected,
4077         .slot_reset = ixgbe_io_slot_reset,
4078         .resume = ixgbe_io_resume,
4079 };
4080
4081 static struct pci_driver ixgbe_driver = {
4082         .name     = ixgbe_driver_name,
4083         .id_table = ixgbe_pci_tbl,
4084         .probe    = ixgbe_probe,
4085         .remove   = __devexit_p(ixgbe_remove),
4086 #ifdef CONFIG_PM
4087         .suspend  = ixgbe_suspend,
4088         .resume   = ixgbe_resume,
4089 #endif
4090         .shutdown = ixgbe_shutdown,
4091         .err_handler = &ixgbe_err_handler
4092 };
4093
4094 /**
4095  * ixgbe_init_module - Driver Registration Routine
4096  *
4097  * ixgbe_init_module is the first routine called when the driver is
4098  * loaded. All it does is register with the PCI subsystem.
4099  **/
4100 static int __init ixgbe_init_module(void)
4101 {
4102         int ret;
4103         printk(KERN_INFO "%s: %s - version %s\n", ixgbe_driver_name,
4104                ixgbe_driver_string, ixgbe_driver_version);
4105
4106         printk(KERN_INFO "%s: %s\n", ixgbe_driver_name, ixgbe_copyright);
4107
4108 #ifdef CONFIG_IXGBE_DCA
4109         dca_register_notify(&dca_notifier);
4110 #endif
4111
4112         ret = pci_register_driver(&ixgbe_driver);
4113         return ret;
4114 }
4115
4116 module_init(ixgbe_init_module);
4117
4118 /**
4119  * ixgbe_exit_module - Driver Exit Cleanup Routine
4120  *
4121  * ixgbe_exit_module is called just before the driver is removed
4122  * from memory.
4123  **/
4124 static void __exit ixgbe_exit_module(void)
4125 {
4126 #ifdef CONFIG_IXGBE_DCA
4127         dca_unregister_notify(&dca_notifier);
4128 #endif
4129         pci_unregister_driver(&ixgbe_driver);
4130 }
4131
4132 #ifdef CONFIG_IXGBE_DCA
4133 static int ixgbe_notify_dca(struct notifier_block *nb, unsigned long event,
4134                             void *p)
4135 {
4136         int ret_val;
4137
4138         ret_val = driver_for_each_device(&ixgbe_driver.driver, NULL, &event,
4139                                          __ixgbe_notify_dca);
4140
4141         return ret_val ? NOTIFY_BAD : NOTIFY_DONE;
4142 }
4143 #endif /* CONFIG_IXGBE_DCA */
4144
4145 module_exit(ixgbe_exit_module);
4146
4147 /* ixgbe_main.c */