git.oblomov.eu Git - linux-2.6/blob - drivers/net/ibmveth.c

   1 /**************************************************************************/
   2 /*                                                                        */
   3 /* IBM eServer i/pSeries Virtual Ethernet Device Driver                   */
   4 /* Copyright (C) 2003 IBM Corp.                                           */
   5 /*  Originally written by Dave Larson (larson1@us.ibm.com)                */
   6 /*  Maintained by Santiago Leon (santil@us.ibm.com)                       */
   7 /*                                                                        */
   8 /*  This program is free software; you can redistribute it and/or modify  */
   9 /*  it under the terms of the GNU General Public License as published by  */
  10 /*  the Free Software Foundation; either version 2 of the License, or     */
  11 /*  (at your option) any later version.                                   */
  12 /*                                                                        */
  13 /*  This program is distributed in the hope that it will be useful,       */
  14 /*  but WITHOUT ANY WARRANTY; without even the implied warranty of        */
  15 /*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         */
  16 /*  GNU General Public License for more details.                          */
  17 /*                                                                        */
  18 /*  You should have received a copy of the GNU General Public License     */
  19 /*  along with this program; if not, write to the Free Software           */
  20 /*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  */
  21 /*                                                                   USA  */
  22 /*                                                                        */
  23 /* This module contains the implementation of a virtual ethernet device   */
  24 /* for use with IBM i/pSeries LPAR Linux.  It utilizes the logical LAN    */
  25 /* option of the RS/6000 Platform Architechture to interface with virtual */
  26 /* ethernet NICs that are presented to the partition by the hypervisor.   */
  27 /*                                                                        */
  28 /**************************************************************************/
  29 /*
  30   TODO:
  31   - add support for sysfs
  32   - possibly remove procfs support
  33 */
  34
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/types.h>
  38 #include <linux/errno.h>
  39 #include <linux/ioport.h>
  40 #include <linux/dma-mapping.h>
  41 #include <linux/kernel.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/etherdevice.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/init.h>
  46 #include <linux/delay.h>
  47 #include <linux/mm.h>
  48 #include <linux/ethtool.h>
  49 #include <linux/proc_fs.h>
  50 #include <linux/in.h>
  51 #include <linux/ip.h>
  52 #include <net/net_namespace.h>
  53 #include <asm/hvcall.h>
  54 #include <asm/atomic.h>
  55 #include <asm/vio.h>
  56 #include <asm/iommu.h>
  57 #include <asm/uaccess.h>
  58 #include <asm/firmware.h>
  59 #include <linux/seq_file.h>
  60
  61 #include "ibmveth.h"
  62
  63 #undef DEBUG
  64
  65 #define ibmveth_printk(fmt, args...) \
  66   printk(KERN_DEBUG "%s: " fmt, __FILE__, ## args)
  67
  68 #define ibmveth_error_printk(fmt, args...) \
  69   printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
  70
  71 #ifdef DEBUG
  72 #define ibmveth_debug_printk_no_adapter(fmt, args...) \
  73   printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args)
  74 #define ibmveth_debug_printk(fmt, args...) \
  75   printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
  76 #define ibmveth_assert(expr) \
  77   if(!(expr)) {                                   \
  78     printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
  79     BUG(); \
  80   }
  81 #else
  82 #define ibmveth_debug_printk_no_adapter(fmt, args...)
  83 #define ibmveth_debug_printk(fmt, args...)
  84 #define ibmveth_assert(expr)
  85 #endif
  86
  87 static int ibmveth_open(struct net_device *dev);
  88 static int ibmveth_close(struct net_device *dev);
  89 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
  90 static int ibmveth_poll(struct napi_struct *napi, int budget);
  91 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev);
  92 static void ibmveth_set_multicast_list(struct net_device *dev);
  93 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu);
  94 static void ibmveth_proc_register_driver(void);
  95 static void ibmveth_proc_unregister_driver(void);
  96 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
  97 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
  98 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  99 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
 100 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
 101 static struct kobj_type ktype_veth_pool;
 102
 103
 104 #ifdef CONFIG_PROC_FS
 105 #define IBMVETH_PROC_DIR "ibmveth"
 106 static struct proc_dir_entry *ibmveth_proc_dir;
 107 #endif
 108
 109 static const char ibmveth_driver_name[] = "ibmveth";
 110 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
 111 #define ibmveth_driver_version "1.03"
 112
 113 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
 114 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
 115 MODULE_LICENSE("GPL");
 116 MODULE_VERSION(ibmveth_driver_version);
 117
 118 struct ibmveth_stat {
 119         char name[ETH_GSTRING_LEN];
 120         int offset;
 121 };
 122
 123 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
 124 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
 125
 126 struct ibmveth_stat ibmveth_stats[] = {
 127         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
 128         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
 129         { "replenish_add_buff_failure", IBMVETH_STAT_OFF(replenish_add_buff_failure) },
 130         { "replenish_add_buff_success", IBMVETH_STAT_OFF(replenish_add_buff_success) },
 131         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
 132         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
 133         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 134         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 135 };
 136
 137 /* simple methods of getting data from the current rxq entry */
 138 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 139 {
 140         return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
 141 }
 142
 143 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 144 {
 145         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >> IBMVETH_RXQ_TOGGLE_SHIFT;
 146 }
 147
 148 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 149 {
 150         return (ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle);
 151 }
 152
 153 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 154 {
 155         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID);
 156 }
 157
 158 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 159 {
 160         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK);
 161 }
 162
 163 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 164 {
 165         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 166 }
 167
 168 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 169 {
 170         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD);
 171 }
 172
 173 /* setup the initial settings for a buffer pool */
 174 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
 175 {
 176         pool->size = pool_size;
 177         pool->index = pool_index;
 178         pool->buff_size = buff_size;
 179         pool->threshold = pool_size / 2;
 180         pool->active = pool_active;
 181 }
 182
 183 /* allocate and setup an buffer pool - called during open */
 184 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 185 {
 186         int i;
 187
 188         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 189
 190         if(!pool->free_map) {
 191                 return -1;
 192         }
 193
 194         pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
 195         if(!pool->dma_addr) {
 196                 kfree(pool->free_map);
 197                 pool->free_map = NULL;
 198                 return -1;
 199         }
 200
 201         pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL);
 202
 203         if(!pool->skbuff) {
 204                 kfree(pool->dma_addr);
 205                 pool->dma_addr = NULL;
 206
 207                 kfree(pool->free_map);
 208                 pool->free_map = NULL;
 209                 return -1;
 210         }
 211
 212         memset(pool->skbuff, 0, sizeof(void*) * pool->size);
 213         memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
 214
 215         for(i = 0; i < pool->size; ++i) {
 216                 pool->free_map[i] = i;
 217         }
 218
 219         atomic_set(&pool->available, 0);
 220         pool->producer_index = 0;
 221         pool->consumer_index = 0;
 222
 223         return 0;
 224 }
 225
 226 /* replenish the buffers for a pool.  note that we don't need to
 227  * skb_reserve these since they are used for incoming...
 228  */
 229 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
 230 {
 231         u32 i;
 232         u32 count = pool->size - atomic_read(&pool->available);
 233         u32 buffers_added = 0;
 234         struct sk_buff *skb;
 235         unsigned int free_index, index;
 236         u64 correlator;
 237         unsigned long lpar_rc;
 238         dma_addr_t dma_addr;
 239
 240         mb();
 241
 242         for(i = 0; i < count; ++i) {
 243                 union ibmveth_buf_desc desc;
 244
 245                 skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
 246
 247                 if(!skb) {
 248                         ibmveth_debug_printk("replenish: unable to allocate skb\n");
 249                         adapter->replenish_no_mem++;
 250                         break;
 251                 }
 252
 253                 free_index = pool->consumer_index;
 254                 pool->consumer_index = (pool->consumer_index + 1) % pool->size;
 255                 index = pool->free_map[free_index];
 256
 257                 ibmveth_assert(index != IBM_VETH_INVALID_MAP);
 258                 ibmveth_assert(pool->skbuff[index] == NULL);
 259
 260                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 261                                 pool->buff_size, DMA_FROM_DEVICE);
 262
 263                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 264                         goto failure;
 265
 266                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 267                 pool->dma_addr[index] = dma_addr;
 268                 pool->skbuff[index] = skb;
 269
 270                 correlator = ((u64)pool->index << 32) | index;
 271                 *(u64*)skb->data = correlator;
 272
 273                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 274                 desc.fields.address = dma_addr;
 275
 276                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 277
 278                 if (lpar_rc != H_SUCCESS)
 279                         goto failure;
 280                 else {
 281                         buffers_added++;
 282                         adapter->replenish_add_buff_success++;
 283                 }
 284         }
 285
 286         mb();
 287         atomic_add(buffers_added, &(pool->available));
 288         return;
 289
 290 failure:
 291         pool->free_map[free_index] = index;
 292         pool->skbuff[index] = NULL;
 293         if (pool->consumer_index == 0)
 294                 pool->consumer_index = pool->size - 1;
 295         else
 296                 pool->consumer_index--;
 297         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 298                 dma_unmap_single(&adapter->vdev->dev,
 299                                  pool->dma_addr[index], pool->buff_size,
 300                                  DMA_FROM_DEVICE);
 301         dev_kfree_skb_any(skb);
 302         adapter->replenish_add_buff_failure++;
 303
 304         mb();
 305         atomic_add(buffers_added, &(pool->available));
 306 }
 307
 308 /* replenish routine */
 309 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 310 {
 311         int i;
 312
 313         adapter->replenish_task_cycles++;
 314
 315         for (i = (IbmVethNumBufferPools - 1); i >= 0; i--)
 316                 if(adapter->rx_buff_pool[i].active)
 317                         ibmveth_replenish_buffer_pool(adapter,
 318                                                      &adapter->rx_buff_pool[i]);
 319
 320         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
 321 }
 322
 323 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 324 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
 325 {
 326         int i;
 327
 328         kfree(pool->free_map);
 329         pool->free_map = NULL;
 330
 331         if(pool->skbuff && pool->dma_addr) {
 332                 for(i = 0; i < pool->size; ++i) {
 333                         struct sk_buff *skb = pool->skbuff[i];
 334                         if(skb) {
 335                                 dma_unmap_single(&adapter->vdev->dev,
 336                                                  pool->dma_addr[i],
 337                                                  pool->buff_size,
 338                                                  DMA_FROM_DEVICE);
 339                                 dev_kfree_skb_any(skb);
 340                                 pool->skbuff[i] = NULL;
 341                         }
 342                 }
 343         }
 344
 345         if(pool->dma_addr) {
 346                 kfree(pool->dma_addr);
 347                 pool->dma_addr = NULL;
 348         }
 349
 350         if(pool->skbuff) {
 351                 kfree(pool->skbuff);
 352                 pool->skbuff = NULL;
 353         }
 354 }
 355
 356 /* remove a buffer from a pool */
 357 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator)
 358 {
 359         unsigned int pool  = correlator >> 32;
 360         unsigned int index = correlator & 0xffffffffUL;
 361         unsigned int free_index;
 362         struct sk_buff *skb;
 363
 364         ibmveth_assert(pool < IbmVethNumBufferPools);
 365         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 366
 367         skb = adapter->rx_buff_pool[pool].skbuff[index];
 368
 369         ibmveth_assert(skb != NULL);
 370
 371         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 372
 373         dma_unmap_single(&adapter->vdev->dev,
 374                          adapter->rx_buff_pool[pool].dma_addr[index],
 375                          adapter->rx_buff_pool[pool].buff_size,
 376                          DMA_FROM_DEVICE);
 377
 378         free_index = adapter->rx_buff_pool[pool].producer_index;
 379         adapter->rx_buff_pool[pool].producer_index
 380                 = (adapter->rx_buff_pool[pool].producer_index + 1)
 381                 % adapter->rx_buff_pool[pool].size;
 382         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 383
 384         mb();
 385
 386         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 387 }
 388
 389 /* get the current buffer on the rx queue */
 390 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 391 {
 392         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 393         unsigned int pool = correlator >> 32;
 394         unsigned int index = correlator & 0xffffffffUL;
 395
 396         ibmveth_assert(pool < IbmVethNumBufferPools);
 397         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 398
 399         return adapter->rx_buff_pool[pool].skbuff[index];
 400 }
 401
 402 /* recycle the current buffer on the rx queue */
 403 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 404 {
 405         u32 q_index = adapter->rx_queue.index;
 406         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 407         unsigned int pool = correlator >> 32;
 408         unsigned int index = correlator & 0xffffffffUL;
 409         union ibmveth_buf_desc desc;
 410         unsigned long lpar_rc;
 411
 412         ibmveth_assert(pool < IbmVethNumBufferPools);
 413         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 414
 415         if(!adapter->rx_buff_pool[pool].active) {
 416                 ibmveth_rxq_harvest_buffer(adapter);
 417                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 418                 return;
 419         }
 420
 421         desc.fields.flags_len = IBMVETH_BUF_VALID |
 422                 adapter->rx_buff_pool[pool].buff_size;
 423         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 424
 425         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 426
 427         if(lpar_rc != H_SUCCESS) {
 428                 ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
 429                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 430         }
 431
 432         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 433                 adapter->rx_queue.index = 0;
 434                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 435         }
 436 }
 437
 438 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 439 {
 440         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 441
 442         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 443                 adapter->rx_queue.index = 0;
 444                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 445         }
 446 }
 447
 448 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 449 {
 450         int i;
 451         struct device *dev = &adapter->vdev->dev;
 452
 453         if(adapter->buffer_list_addr != NULL) {
 454                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
 455                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 456                                         DMA_BIDIRECTIONAL);
 457                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 458                 }
 459                 free_page((unsigned long)adapter->buffer_list_addr);
 460                 adapter->buffer_list_addr = NULL;
 461         }
 462
 463         if(adapter->filter_list_addr != NULL) {
 464                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
 465                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 466                                         DMA_BIDIRECTIONAL);
 467                         adapter->filter_list_dma = DMA_ERROR_CODE;
 468                 }
 469                 free_page((unsigned long)adapter->filter_list_addr);
 470                 adapter->filter_list_addr = NULL;
 471         }
 472
 473         if(adapter->rx_queue.queue_addr != NULL) {
 474                 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
 475                         dma_unmap_single(dev,
 476                                         adapter->rx_queue.queue_dma,
 477                                         adapter->rx_queue.queue_len,
 478                                         DMA_BIDIRECTIONAL);
 479                         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
 480                 }
 481                 kfree(adapter->rx_queue.queue_addr);
 482                 adapter->rx_queue.queue_addr = NULL;
 483         }
 484
 485         for(i = 0; i<IbmVethNumBufferPools; i++)
 486                 if (adapter->rx_buff_pool[i].active)
 487                         ibmveth_free_buffer_pool(adapter,
 488                                                  &adapter->rx_buff_pool[i]);
 489
 490         if (adapter->bounce_buffer != NULL) {
 491                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 492                         dma_unmap_single(&adapter->vdev->dev,
 493                                         adapter->bounce_buffer_dma,
 494                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
 495                                         DMA_BIDIRECTIONAL);
 496                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
 497                 }
 498                 kfree(adapter->bounce_buffer);
 499                 adapter->bounce_buffer = NULL;
 500         }
 501 }
 502
 503 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 504         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 505 {
 506         int rc, try_again = 1;
 507
 508         /* After a kexec the adapter will still be open, so our attempt to
 509         * open it will fail. So if we get a failure we free the adapter and
 510         * try again, but only once. */
 511 retry:
 512         rc = h_register_logical_lan(adapter->vdev->unit_address,
 513                                     adapter->buffer_list_dma, rxq_desc.desc,
 514                                     adapter->filter_list_dma, mac_address);
 515
 516         if (rc != H_SUCCESS && try_again) {
 517                 do {
 518                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 519                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 520
 521                 try_again = 0;
 522                 goto retry;
 523         }
 524
 525         return rc;
 526 }
 527
 528 static int ibmveth_open(struct net_device *netdev)
 529 {
 530         struct ibmveth_adapter *adapter = netdev->priv;
 531         u64 mac_address = 0;
 532         int rxq_entries = 1;
 533         unsigned long lpar_rc;
 534         int rc;
 535         union ibmveth_buf_desc rxq_desc;
 536         int i;
 537         struct device *dev;
 538
 539         ibmveth_debug_printk("open starting\n");
 540
 541         napi_enable(&adapter->napi);
 542
 543         for(i = 0; i<IbmVethNumBufferPools; i++)
 544                 rxq_entries += adapter->rx_buff_pool[i].size;
 545
 546         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 547         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 548
 549         if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 550                 ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
 551                 ibmveth_cleanup(adapter);
 552                 napi_disable(&adapter->napi);
 553                 return -ENOMEM;
 554         }
 555
 556         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
 557         adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
 558
 559         if(!adapter->rx_queue.queue_addr) {
 560                 ibmveth_error_printk("unable to allocate rx queue pages\n");
 561                 ibmveth_cleanup(adapter);
 562                 napi_disable(&adapter->napi);
 563                 return -ENOMEM;
 564         }
 565
 566         dev = &adapter->vdev->dev;
 567
 568         adapter->buffer_list_dma = dma_map_single(dev,
 569                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 570         adapter->filter_list_dma = dma_map_single(dev,
 571                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 572         adapter->rx_queue.queue_dma = dma_map_single(dev,
 573                         adapter->rx_queue.queue_addr,
 574                         adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
 575
 576         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
 577             (dma_mapping_error(dev, adapter->filter_list_dma)) ||
 578             (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
 579                 ibmveth_error_printk("unable to map filter or buffer list pages\n");
 580                 ibmveth_cleanup(adapter);
 581                 napi_disable(&adapter->napi);
 582                 return -ENOMEM;
 583         }
 584
 585         adapter->rx_queue.index = 0;
 586         adapter->rx_queue.num_slots = rxq_entries;
 587         adapter->rx_queue.toggle = 1;
 588
 589         memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
 590         mac_address = mac_address >> 16;
 591
 592         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | adapter->rx_queue.queue_len;
 593         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 594
 595         ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr);
 596         ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
 597         ibmveth_debug_printk("receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 598
 599         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 600
 601         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 602
 603         if(lpar_rc != H_SUCCESS) {
 604                 ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc);
 605                 ibmveth_error_printk("buffer TCE:0x%lx filter TCE:0x%lx rxq desc:0x%lx MAC:0x%lx\n",
 606                                      adapter->buffer_list_dma,
 607                                      adapter->filter_list_dma,
 608                                      rxq_desc.desc,
 609                                      mac_address);
 610                 ibmveth_cleanup(adapter);
 611                 napi_disable(&adapter->napi);
 612                 return -ENONET;
 613         }
 614
 615         for(i = 0; i<IbmVethNumBufferPools; i++) {
 616                 if(!adapter->rx_buff_pool[i].active)
 617                         continue;
 618                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 619                         ibmveth_error_printk("unable to alloc pool\n");
 620                         adapter->rx_buff_pool[i].active = 0;
 621                         ibmveth_cleanup(adapter);
 622                         napi_disable(&adapter->napi);
 623                         return -ENOMEM ;
 624                 }
 625         }
 626
 627         ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
 628         if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
 629                 ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc);
 630                 do {
 631                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 632                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 633
 634                 ibmveth_cleanup(adapter);
 635                 napi_disable(&adapter->napi);
 636                 return rc;
 637         }
 638
 639         adapter->bounce_buffer =
 640             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 641         if (!adapter->bounce_buffer) {
 642                 ibmveth_error_printk("unable to allocate bounce buffer\n");
 643                 ibmveth_cleanup(adapter);
 644                 napi_disable(&adapter->napi);
 645                 return -ENOMEM;
 646         }
 647         adapter->bounce_buffer_dma =
 648             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 649                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 650         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 651                 ibmveth_error_printk("unable to map bounce buffer\n");
 652                 ibmveth_cleanup(adapter);
 653                 napi_disable(&adapter->napi);
 654                 return -ENOMEM;
 655         }
 656
 657         ibmveth_debug_printk("initial replenish cycle\n");
 658         ibmveth_interrupt(netdev->irq, netdev);
 659
 660         netif_start_queue(netdev);
 661
 662         ibmveth_debug_printk("open complete\n");
 663
 664         return 0;
 665 }
 666
 667 static int ibmveth_close(struct net_device *netdev)
 668 {
 669         struct ibmveth_adapter *adapter = netdev->priv;
 670         long lpar_rc;
 671
 672         ibmveth_debug_printk("close starting\n");
 673
 674         napi_disable(&adapter->napi);
 675
 676         if (!adapter->pool_config)
 677                 netif_stop_queue(netdev);
 678
 679         free_irq(netdev->irq, netdev);
 680
 681         do {
 682                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 683         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 684
 685         if(lpar_rc != H_SUCCESS)
 686         {
 687                 ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n",
 688                                      lpar_rc);
 689         }
 690
 691         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
 692
 693         ibmveth_cleanup(adapter);
 694
 695         ibmveth_debug_printk("close complete\n");
 696
 697         return 0;
 698 }
 699
 700 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
 701         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 702         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
 703         cmd->speed = SPEED_1000;
 704         cmd->duplex = DUPLEX_FULL;
 705         cmd->port = PORT_FIBRE;
 706         cmd->phy_address = 0;
 707         cmd->transceiver = XCVR_INTERNAL;
 708         cmd->autoneg = AUTONEG_ENABLE;
 709         cmd->maxtxpkt = 0;
 710         cmd->maxrxpkt = 1;
 711         return 0;
 712 }
 713
 714 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
 715         strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
 716         strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
 717 }
 718
 719 static u32 netdev_get_link(struct net_device *dev) {
 720         return 1;
 721 }
 722
 723 static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
 724 {
 725         struct ibmveth_adapter *adapter = dev->priv;
 726
 727         if (data)
 728                 adapter->rx_csum = 1;
 729         else {
 730                 /*
 731                  * Since the ibmveth firmware interface does not have the concept of
 732                  * separate tx/rx checksum offload enable, if rx checksum is disabled
 733                  * we also have to disable tx checksum offload. Once we disable rx
 734                  * checksum offload, we are no longer allowed to send tx buffers that
 735                  * are not properly checksummed.
 736                  */
 737                 adapter->rx_csum = 0;
 738                 dev->features &= ~NETIF_F_IP_CSUM;
 739         }
 740 }
 741
 742 static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
 743 {
 744         struct ibmveth_adapter *adapter = dev->priv;
 745
 746         if (data) {
 747                 dev->features |= NETIF_F_IP_CSUM;
 748                 adapter->rx_csum = 1;
 749         } else
 750                 dev->features &= ~NETIF_F_IP_CSUM;
 751 }
 752
 753 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
 754                                     void (*done) (struct net_device *, u32))
 755 {
 756         struct ibmveth_adapter *adapter = dev->priv;
 757         u64 set_attr, clr_attr, ret_attr;
 758         long ret;
 759         int rc1 = 0, rc2 = 0;
 760         int restart = 0;
 761
 762         if (netif_running(dev)) {
 763                 restart = 1;
 764                 adapter->pool_config = 1;
 765                 ibmveth_close(dev);
 766                 adapter->pool_config = 0;
 767         }
 768
 769         set_attr = 0;
 770         clr_attr = 0;
 771
 772         if (data)
 773                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 774         else
 775                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 776
 777         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 778
 779         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
 780             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
 781             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 782                 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 783                                          set_attr, &ret_attr);
 784
 785                 if (ret != H_SUCCESS) {
 786                         rc1 = -EIO;
 787                         ibmveth_error_printk("unable to change checksum offload settings."
 788                                              " %d rc=%ld\n", data, ret);
 789
 790                         ret = h_illan_attributes(adapter->vdev->unit_address,
 791                                                  set_attr, clr_attr, &ret_attr);
 792                 } else
 793                         done(dev, data);
 794         } else {
 795                 rc1 = -EIO;
 796                 ibmveth_error_printk("unable to change checksum offload settings."
 797                                      " %d rc=%ld ret_attr=%lx\n", data, ret, ret_attr);
 798         }
 799
 800         if (restart)
 801                 rc2 = ibmveth_open(dev);
 802
 803         return rc1 ? rc1 : rc2;
 804 }
 805
 806 static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
 807 {
 808         struct ibmveth_adapter *adapter = dev->priv;
 809
 810         if ((data && adapter->rx_csum) || (!data && !adapter->rx_csum))
 811                 return 0;
 812
 813         return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
 814 }
 815
 816 static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
 817 {
 818         struct ibmveth_adapter *adapter = dev->priv;
 819         int rc = 0;
 820
 821         if (data && (dev->features & NETIF_F_IP_CSUM))
 822                 return 0;
 823         if (!data && !(dev->features & NETIF_F_IP_CSUM))
 824                 return 0;
 825
 826         if (data && !adapter->rx_csum)
 827                 rc = ibmveth_set_csum_offload(dev, data, ibmveth_set_tx_csum_flags);
 828         else
 829                 ibmveth_set_tx_csum_flags(dev, data);
 830
 831         return rc;
 832 }
 833
 834 static u32 ibmveth_get_rx_csum(struct net_device *dev)
 835 {
 836         struct ibmveth_adapter *adapter = dev->priv;
 837         return adapter->rx_csum;
 838 }
 839
 840 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 841 {
 842         int i;
 843
 844         if (stringset != ETH_SS_STATS)
 845                 return;
 846
 847         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 848                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 849 }
 850
 851 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 852 {
 853         switch (sset) {
 854         case ETH_SS_STATS:
 855                 return ARRAY_SIZE(ibmveth_stats);
 856         default:
 857                 return -EOPNOTSUPP;
 858         }
 859 }
 860
 861 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 862                                       struct ethtool_stats *stats, u64 *data)
 863 {
 864         int i;
 865         struct ibmveth_adapter *adapter = dev->priv;
 866
 867         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 868                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 869 }
 870
 871 static const struct ethtool_ops netdev_ethtool_ops = {
 872         .get_drvinfo            = netdev_get_drvinfo,
 873         .get_settings           = netdev_get_settings,
 874         .get_link               = netdev_get_link,
 875         .set_tx_csum            = ibmveth_set_tx_csum,
 876         .get_rx_csum            = ibmveth_get_rx_csum,
 877         .set_rx_csum            = ibmveth_set_rx_csum,
 878         .get_strings            = ibmveth_get_strings,
 879         .get_sset_count         = ibmveth_get_sset_count,
 880         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 881 };
 882
 883 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 884 {
 885         return -EOPNOTSUPP;
 886 }
 887
 888 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 889
 890 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 891 {
 892         struct ibmveth_adapter *adapter = netdev->priv;
 893         union ibmveth_buf_desc desc;
 894         unsigned long lpar_rc;
 895         unsigned long correlator;
 896         unsigned long flags;
 897         unsigned int retry_count;
 898         unsigned int tx_dropped = 0;
 899         unsigned int tx_bytes = 0;
 900         unsigned int tx_packets = 0;
 901         unsigned int tx_send_failed = 0;
 902         unsigned int tx_map_failed = 0;
 903         int used_bounce = 0;
 904         unsigned long data_dma_addr;
 905
 906         desc.fields.flags_len = IBMVETH_BUF_VALID | skb->len;
 907         data_dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 908                                        skb->len, DMA_TO_DEVICE);
 909
 910         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 911             ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
 912                 ibmveth_error_printk("tx: failed to checksum packet\n");
 913                 tx_dropped++;
 914                 goto out;
 915         }
 916
 917         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 918                 unsigned char *buf = skb_transport_header(skb) + skb->csum_offset;
 919
 920                 desc.fields.flags_len |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
 921
 922                 /* Need to zero out the checksum */
 923                 buf[0] = 0;
 924                 buf[1] = 0;
 925         }
 926
 927         if (dma_mapping_error(&adapter->vdev->dev, data_dma_addr)) {
 928                 if (!firmware_has_feature(FW_FEATURE_CMO))
 929                         ibmveth_error_printk("tx: unable to map xmit buffer\n");
 930                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
 931                                           skb->len);
 932                 desc.fields.address = adapter->bounce_buffer_dma;
 933                 tx_map_failed++;
 934                 used_bounce = 1;
 935         } else
 936                 desc.fields.address = data_dma_addr;
 937
 938         /* send the frame. Arbitrarily set retrycount to 1024 */
 939         correlator = 0;
 940         retry_count = 1024;
 941         do {
 942                 lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
 943                                              desc.desc, 0, 0, 0, 0, 0,
 944                                              correlator, &correlator);
 945         } while ((lpar_rc == H_BUSY) && (retry_count--));
 946
 947         if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
 948                 ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
 949                 ibmveth_error_printk("tx: valid=%d, len=%d, address=0x%08x\n",
 950                                      (desc.fields.flags_len & IBMVETH_BUF_VALID) ? 1 : 0,
 951                                      skb->len, desc.fields.address);
 952                 tx_send_failed++;
 953                 tx_dropped++;
 954         } else {
 955                 tx_packets++;
 956                 tx_bytes += skb->len;
 957                 netdev->trans_start = jiffies;
 958         }
 959
 960         if (!used_bounce)
 961                 dma_unmap_single(&adapter->vdev->dev, data_dma_addr,
 962                                  skb->len, DMA_TO_DEVICE);
 963
 964 out:    spin_lock_irqsave(&adapter->stats_lock, flags);
 965         netdev->stats.tx_dropped += tx_dropped;
 966         netdev->stats.tx_bytes += tx_bytes;
 967         netdev->stats.tx_packets += tx_packets;
 968         adapter->tx_send_failed += tx_send_failed;
 969         adapter->tx_map_failed += tx_map_failed;
 970         spin_unlock_irqrestore(&adapter->stats_lock, flags);
 971
 972         dev_kfree_skb(skb);
 973         return 0;
 974 }
 975
 976 static int ibmveth_poll(struct napi_struct *napi, int budget)
 977 {
 978         struct ibmveth_adapter *adapter = container_of(napi, struct ibmveth_adapter, napi);
 979         struct net_device *netdev = adapter->netdev;
 980         int frames_processed = 0;
 981         unsigned long lpar_rc;
 982
 983  restart_poll:
 984         do {
 985                 struct sk_buff *skb;
 986
 987                 if (!ibmveth_rxq_pending_buffer(adapter))
 988                         break;
 989
 990                 rmb();
 991                 if (!ibmveth_rxq_buffer_valid(adapter)) {
 992                         wmb(); /* suggested by larson1 */
 993                         adapter->rx_invalid_buffer++;
 994                         ibmveth_debug_printk("recycling invalid buffer\n");
 995                         ibmveth_rxq_recycle_buffer(adapter);
 996                 } else {
 997                         int length = ibmveth_rxq_frame_length(adapter);
 998                         int offset = ibmveth_rxq_frame_offset(adapter);
 999                         int csum_good = ibmveth_rxq_csum_good(adapter);
1000
1001                         skb = ibmveth_rxq_get_buffer(adapter);
1002                         if (csum_good)
1003                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1004
1005                         ibmveth_rxq_harvest_buffer(adapter);
1006
1007                         skb_reserve(skb, offset);
1008                         skb_put(skb, length);
1009                         skb->protocol = eth_type_trans(skb, netdev);
1010
1011                         netif_receive_skb(skb); /* send it up */
1012
1013                         netdev->stats.rx_packets++;
1014                         netdev->stats.rx_bytes += length;
1015                         frames_processed++;
1016                         netdev->last_rx = jiffies;
1017                 }
1018         } while (frames_processed < budget);
1019
1020         ibmveth_replenish_task(adapter);
1021
1022         if (frames_processed < budget) {
1023                 /* We think we are done - reenable interrupts,
1024                  * then check once more to make sure we are done.
1025                  */
1026                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1027                                        VIO_IRQ_ENABLE);
1028
1029                 ibmveth_assert(lpar_rc == H_SUCCESS);
1030
1031                 netif_rx_complete(netdev, napi);
1032
1033                 if (ibmveth_rxq_pending_buffer(adapter) &&
1034                     netif_rx_reschedule(netdev, napi)) {
1035                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1036                                                VIO_IRQ_DISABLE);
1037                         goto restart_poll;
1038                 }
1039         }
1040
1041         return frames_processed;
1042 }
1043
1044 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1045 {
1046         struct net_device *netdev = dev_instance;
1047         struct ibmveth_adapter *adapter = netdev->priv;
1048         unsigned long lpar_rc;
1049
1050         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1051                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1052                                        VIO_IRQ_DISABLE);
1053                 ibmveth_assert(lpar_rc == H_SUCCESS);
1054                 __netif_rx_schedule(netdev, &adapter->napi);
1055         }
1056         return IRQ_HANDLED;
1057 }
1058
1059 static void ibmveth_set_multicast_list(struct net_device *netdev)
1060 {
1061         struct ibmveth_adapter *adapter = netdev->priv;
1062         unsigned long lpar_rc;
1063
1064         if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) {
1065                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1066                                            IbmVethMcastEnableRecv |
1067                                            IbmVethMcastDisableFiltering,
1068                                            0);
1069                 if(lpar_rc != H_SUCCESS) {
1070                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc);
1071                 }
1072         } else {
1073                 struct dev_mc_list *mclist = netdev->mc_list;
1074                 int i;
1075                 /* clear the filter table & disable filtering */
1076                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1077                                            IbmVethMcastEnableRecv |
1078                                            IbmVethMcastDisableFiltering |
1079                                            IbmVethMcastClearFilterTable,
1080                                            0);
1081                 if(lpar_rc != H_SUCCESS) {
1082                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc);
1083                 }
1084                 /* add the addresses to the filter table */
1085                 for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) {
1086                         // add the multicast address to the filter table
1087                         unsigned long mcast_addr = 0;
1088                         memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6);
1089                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1090                                                    IbmVethMcastAddFilter,
1091                                                    mcast_addr);
1092                         if(lpar_rc != H_SUCCESS) {
1093                                 ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
1094                         }
1095                 }
1096
1097                 /* re-enable filtering */
1098                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1099                                            IbmVethMcastEnableFiltering,
1100                                            0);
1101                 if(lpar_rc != H_SUCCESS) {
1102                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc);
1103                 }
1104         }
1105 }
1106
1107 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1108 {
1109         struct ibmveth_adapter *adapter = dev->priv;
1110         struct vio_dev *viodev = adapter->vdev;
1111         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1112         int i;
1113
1114         if (new_mtu < IBMVETH_MAX_MTU)
1115                 return -EINVAL;
1116
1117         for (i = 0; i < IbmVethNumBufferPools; i++)
1118                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1119                         break;
1120
1121         if (i == IbmVethNumBufferPools)
1122                 return -EINVAL;
1123
1124         /* Deactivate all the buffer pools so that the next loop can activate
1125            only the buffer pools necessary to hold the new MTU */
1126         for (i = 0; i < IbmVethNumBufferPools; i++)
1127                 if (adapter->rx_buff_pool[i].active) {
1128                         ibmveth_free_buffer_pool(adapter,
1129                                                  &adapter->rx_buff_pool[i]);
1130                         adapter->rx_buff_pool[i].active = 0;
1131                 }
1132
1133         /* Look for an active buffer pool that can hold the new MTU */
1134         for(i = 0; i<IbmVethNumBufferPools; i++) {
1135                 adapter->rx_buff_pool[i].active = 1;
1136
1137                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1138                         if (netif_running(adapter->netdev)) {
1139                                 adapter->pool_config = 1;
1140                                 ibmveth_close(adapter->netdev);
1141                                 adapter->pool_config = 0;
1142                                 dev->mtu = new_mtu;
1143                                 vio_cmo_set_dev_desired(viodev,
1144                                                 ibmveth_get_desired_dma
1145                                                 (viodev));
1146                                 return ibmveth_open(adapter->netdev);
1147                         }
1148                         dev->mtu = new_mtu;
1149                         vio_cmo_set_dev_desired(viodev,
1150                                                 ibmveth_get_desired_dma
1151                                                 (viodev));
1152                         return 0;
1153                 }
1154         }
1155         return -EINVAL;
1156 }
1157
1158 #ifdef CONFIG_NET_POLL_CONTROLLER
1159 static void ibmveth_poll_controller(struct net_device *dev)
1160 {
1161         ibmveth_replenish_task(dev->priv);
1162         ibmveth_interrupt(dev->irq, dev);
1163 }
1164 #endif
1165
1166 /**
1167  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1168  *
1169  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1170  *
1171  * Return value:
1172  *      Number of bytes of IO data the driver will need to perform well.
1173  */
1174 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1175 {
1176         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1177         struct ibmveth_adapter *adapter;
1178         unsigned long ret;
1179         int i;
1180         int rxqentries = 1;
1181
1182         /* netdev inits at probe time along with the structures we need below*/
1183         if (netdev == NULL)
1184                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1185
1186         adapter = netdev_priv(netdev);
1187
1188         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1189         ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1190
1191         for (i = 0; i < IbmVethNumBufferPools; i++) {
1192                 /* add the size of the active receive buffers */
1193                 if (adapter->rx_buff_pool[i].active)
1194                         ret +=
1195                             adapter->rx_buff_pool[i].size *
1196                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1197                                     buff_size);
1198                 rxqentries += adapter->rx_buff_pool[i].size;
1199         }
1200         /* add the size of the receive queue entries */
1201         ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1202
1203         return ret;
1204 }
1205
1206 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1207 {
1208         int rc, i;
1209         long ret;
1210         struct net_device *netdev;
1211         struct ibmveth_adapter *adapter;
1212         u64 set_attr, ret_attr;
1213
1214         unsigned char *mac_addr_p;
1215         unsigned int *mcastFilterSize_p;
1216
1217
1218         ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n",
1219                                         dev->unit_address);
1220
1221         mac_addr_p = (unsigned char *) vio_get_attribute(dev,
1222                                                 VETH_MAC_ADDR, NULL);
1223         if(!mac_addr_p) {
1224                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR "
1225                                 "attribute\n", __FILE__, __LINE__);
1226                 return 0;
1227         }
1228
1229         mcastFilterSize_p = (unsigned int *) vio_get_attribute(dev,
1230                                                 VETH_MCAST_FILTER_SIZE, NULL);
1231         if(!mcastFilterSize_p) {
1232                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
1233                                 "VETH_MCAST_FILTER_SIZE attribute\n",
1234                                 __FILE__, __LINE__);
1235                 return 0;
1236         }
1237
1238         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1239
1240         if(!netdev)
1241                 return -ENOMEM;
1242
1243         adapter = netdev->priv;
1244         dev->dev.driver_data = netdev;
1245
1246         adapter->vdev = dev;
1247         adapter->netdev = netdev;
1248         adapter->mcastFilterSize= *mcastFilterSize_p;
1249         adapter->pool_config = 0;
1250
1251         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1252
1253         /*      Some older boxes running PHYP non-natively have an OF that
1254                 returns a 8-byte local-mac-address field (and the first
1255                 2 bytes have to be ignored) while newer boxes' OF return
1256                 a 6-byte field. Note that IEEE 1275 specifies that
1257                 local-mac-address must be a 6-byte field.
1258                 The RPA doc specifies that the first byte must be 10b, so
1259                 we'll just look for it to solve this 8 vs. 6 byte field issue */
1260
1261         if ((*mac_addr_p & 0x3) != 0x02)
1262                 mac_addr_p += 2;
1263
1264         adapter->mac_addr = 0;
1265         memcpy(&adapter->mac_addr, mac_addr_p, 6);
1266
1267         netdev->irq = dev->irq;
1268         netdev->open               = ibmveth_open;
1269         netdev->stop               = ibmveth_close;
1270         netdev->hard_start_xmit    = ibmveth_start_xmit;
1271         netdev->set_multicast_list = ibmveth_set_multicast_list;
1272         netdev->do_ioctl           = ibmveth_ioctl;
1273         netdev->ethtool_ops           = &netdev_ethtool_ops;
1274         netdev->change_mtu         = ibmveth_change_mtu;
1275         SET_NETDEV_DEV(netdev, &dev->dev);
1276 #ifdef CONFIG_NET_POLL_CONTROLLER
1277         netdev->poll_controller = ibmveth_poll_controller;
1278 #endif
1279         netdev->features |= NETIF_F_LLTX;
1280         spin_lock_init(&adapter->stats_lock);
1281
1282         memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1283
1284         for(i = 0; i<IbmVethNumBufferPools; i++) {
1285                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1286                 int error;
1287
1288                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1289                                          pool_count[i], pool_size[i],
1290                                          pool_active[i]);
1291                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1292                                              &dev->dev.kobj, "pool%d", i);
1293                 if (!error)
1294                         kobject_uevent(kobj, KOBJ_ADD);
1295         }
1296
1297         ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
1298
1299         adapter->buffer_list_dma = DMA_ERROR_CODE;
1300         adapter->filter_list_dma = DMA_ERROR_CODE;
1301         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1302
1303         ibmveth_debug_printk("registering netdev...\n");
1304
1305         ret = h_illan_attributes(dev->unit_address, 0, 0, &ret_attr);
1306
1307         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
1308             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
1309             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
1310                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
1311
1312                 ret = h_illan_attributes(dev->unit_address, 0, set_attr, &ret_attr);
1313
1314                 if (ret == H_SUCCESS) {
1315                         adapter->rx_csum = 1;
1316                         netdev->features |= NETIF_F_IP_CSUM;
1317                 } else
1318                         ret = h_illan_attributes(dev->unit_address, set_attr, 0, &ret_attr);
1319         }
1320
1321         rc = register_netdev(netdev);
1322
1323         if(rc) {
1324                 ibmveth_debug_printk("failed to register netdev rc=%d\n", rc);
1325                 free_netdev(netdev);
1326                 return rc;
1327         }
1328
1329         ibmveth_debug_printk("registered\n");
1330
1331         ibmveth_proc_register_adapter(adapter);
1332
1333         return 0;
1334 }
1335
1336 static int __devexit ibmveth_remove(struct vio_dev *dev)
1337 {
1338         struct net_device *netdev = dev->dev.driver_data;
1339         struct ibmveth_adapter *adapter = netdev->priv;
1340         int i;
1341
1342         for(i = 0; i<IbmVethNumBufferPools; i++)
1343                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1344
1345         unregister_netdev(netdev);
1346
1347         ibmveth_proc_unregister_adapter(adapter);
1348
1349         free_netdev(netdev);
1350         dev_set_drvdata(&dev->dev, NULL);
1351
1352         return 0;
1353 }
1354
1355 #ifdef CONFIG_PROC_FS
1356 static void ibmveth_proc_register_driver(void)
1357 {
1358         ibmveth_proc_dir = proc_mkdir(IBMVETH_PROC_DIR, init_net.proc_net);
1359         if (ibmveth_proc_dir) {
1360         }
1361 }
1362
1363 static void ibmveth_proc_unregister_driver(void)
1364 {
1365         remove_proc_entry(IBMVETH_PROC_DIR, init_net.proc_net);
1366 }
1367
1368 static int ibmveth_show(struct seq_file *seq, void *v)
1369 {
1370         struct ibmveth_adapter *adapter = seq->private;
1371         char *current_mac = ((char*) &adapter->netdev->dev_addr);
1372         char *firmware_mac = ((char*) &adapter->mac_addr) ;
1373         DECLARE_MAC_BUF(mac);
1374
1375         seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
1376
1377         seq_printf(seq, "Unit Address:    0x%x\n", adapter->vdev->unit_address);
1378         seq_printf(seq, "Current MAC:     %s\n", print_mac(mac, current_mac));
1379         seq_printf(seq, "Firmware MAC:    %s\n", print_mac(mac, firmware_mac));
1380
1381         seq_printf(seq, "\nAdapter Statistics:\n");
1382         seq_printf(seq, "  TX:  vio_map_single failres:      %ld\n", adapter->tx_map_failed);
1383         seq_printf(seq, "       send failures:               %ld\n", adapter->tx_send_failed);
1384         seq_printf(seq, "  RX:  replenish task cycles:       %ld\n", adapter->replenish_task_cycles);
1385         seq_printf(seq, "       alloc_skb_failures:          %ld\n", adapter->replenish_no_mem);
1386         seq_printf(seq, "       add buffer failures:         %ld\n", adapter->replenish_add_buff_failure);
1387         seq_printf(seq, "       invalid buffers:             %ld\n", adapter->rx_invalid_buffer);
1388         seq_printf(seq, "       no buffers:                  %ld\n", adapter->rx_no_buffer);
1389
1390         return 0;
1391 }
1392
1393 static int ibmveth_proc_open(struct inode *inode, struct file *file)
1394 {
1395         return single_open(file, ibmveth_show, PDE(inode)->data);
1396 }
1397
1398 static const struct file_operations ibmveth_proc_fops = {
1399         .owner   = THIS_MODULE,
1400         .open    = ibmveth_proc_open,
1401         .read    = seq_read,
1402         .llseek  = seq_lseek,
1403         .release = single_release,
1404 };
1405
1406 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1407 {
1408         struct proc_dir_entry *entry;
1409         if (ibmveth_proc_dir) {
1410                 char u_addr[10];
1411                 sprintf(u_addr, "%x", adapter->vdev->unit_address);
1412                 entry = proc_create_data(u_addr, S_IFREG, ibmveth_proc_dir,
1413                                          &ibmveth_proc_fops, adapter);
1414                 if (!entry)
1415                         ibmveth_error_printk("Cannot create adapter proc entry");
1416         }
1417         return;
1418 }
1419
1420 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1421 {
1422         if (ibmveth_proc_dir) {
1423                 char u_addr[10];
1424                 sprintf(u_addr, "%x", adapter->vdev->unit_address);
1425                 remove_proc_entry(u_addr, ibmveth_proc_dir);
1426         }
1427 }
1428
1429 #else /* CONFIG_PROC_FS */
1430 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1431 {
1432 }
1433
1434 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1435 {
1436 }
1437 static void ibmveth_proc_register_driver(void)
1438 {
1439 }
1440
1441 static void ibmveth_proc_unregister_driver(void)
1442 {
1443 }
1444 #endif /* CONFIG_PROC_FS */
1445
1446 static struct attribute veth_active_attr;
1447 static struct attribute veth_num_attr;
1448 static struct attribute veth_size_attr;
1449
1450 static ssize_t veth_pool_show(struct kobject * kobj,
1451                               struct attribute * attr, char * buf)
1452 {
1453         struct ibmveth_buff_pool *pool = container_of(kobj,
1454                                                       struct ibmveth_buff_pool,
1455                                                       kobj);
1456
1457         if (attr == &veth_active_attr)
1458                 return sprintf(buf, "%d\n", pool->active);
1459         else if (attr == &veth_num_attr)
1460                 return sprintf(buf, "%d\n", pool->size);
1461         else if (attr == &veth_size_attr)
1462                 return sprintf(buf, "%d\n", pool->buff_size);
1463         return 0;
1464 }
1465
1466 static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
1467 const char * buf, size_t count)
1468 {
1469         struct ibmveth_buff_pool *pool = container_of(kobj,
1470                                                       struct ibmveth_buff_pool,
1471                                                       kobj);
1472         struct net_device *netdev =
1473             container_of(kobj->parent, struct device, kobj)->driver_data;
1474         struct ibmveth_adapter *adapter = netdev->priv;
1475         long value = simple_strtol(buf, NULL, 10);
1476         long rc;
1477
1478         if (attr == &veth_active_attr) {
1479                 if (value && !pool->active) {
1480                         if (netif_running(netdev)) {
1481                                 if(ibmveth_alloc_buffer_pool(pool)) {
1482                                         ibmveth_error_printk("unable to alloc pool\n");
1483                                         return -ENOMEM;
1484                                 }
1485                                 pool->active = 1;
1486                                 adapter->pool_config = 1;
1487                                 ibmveth_close(netdev);
1488                                 adapter->pool_config = 0;
1489                                 if ((rc = ibmveth_open(netdev)))
1490                                         return rc;
1491                         } else
1492                                 pool->active = 1;
1493                 } else if (!value && pool->active) {
1494                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1495                         int i;
1496                         /* Make sure there is a buffer pool with buffers that
1497                            can hold a packet of the size of the MTU */
1498                         for (i = 0; i < IbmVethNumBufferPools; i++) {
1499                                 if (pool == &adapter->rx_buff_pool[i])
1500                                         continue;
1501                                 if (!adapter->rx_buff_pool[i].active)
1502                                         continue;
1503                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1504                                         break;
1505                         }
1506
1507                         if (i == IbmVethNumBufferPools) {
1508                                 ibmveth_error_printk("no active pool >= MTU\n");
1509                                 return -EPERM;
1510                         }
1511
1512                         if (netif_running(netdev)) {
1513                                 adapter->pool_config = 1;
1514                                 ibmveth_close(netdev);
1515                                 pool->active = 0;
1516                                 adapter->pool_config = 0;
1517                                 if ((rc = ibmveth_open(netdev)))
1518                                         return rc;
1519                         }
1520                         pool->active = 0;
1521                 }
1522         } else if (attr == &veth_num_attr) {
1523                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
1524                         return -EINVAL;
1525                 else {
1526                         if (netif_running(netdev)) {
1527                                 adapter->pool_config = 1;
1528                                 ibmveth_close(netdev);
1529                                 adapter->pool_config = 0;
1530                                 pool->size = value;
1531                                 if ((rc = ibmveth_open(netdev)))
1532                                         return rc;
1533                         } else
1534                                 pool->size = value;
1535                 }
1536         } else if (attr == &veth_size_attr) {
1537                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
1538                         return -EINVAL;
1539                 else {
1540                         if (netif_running(netdev)) {
1541                                 adapter->pool_config = 1;
1542                                 ibmveth_close(netdev);
1543                                 adapter->pool_config = 0;
1544                                 pool->buff_size = value;
1545                                 if ((rc = ibmveth_open(netdev)))
1546                                         return rc;
1547                         } else
1548                                 pool->buff_size = value;
1549                 }
1550         }
1551
1552         /* kick the interrupt handler to allocate/deallocate pools */
1553         ibmveth_interrupt(netdev->irq, netdev);
1554         return count;
1555 }
1556
1557
1558 #define ATTR(_name, _mode)      \
1559         struct attribute veth_##_name##_attr = {               \
1560         .name = __stringify(_name), .mode = _mode, \
1561         };
1562
1563 static ATTR(active, 0644);
1564 static ATTR(num, 0644);
1565 static ATTR(size, 0644);
1566
1567 static struct attribute * veth_pool_attrs[] = {
1568         &veth_active_attr,
1569         &veth_num_attr,
1570         &veth_size_attr,
1571         NULL,
1572 };
1573
1574 static struct sysfs_ops veth_pool_ops = {
1575         .show   = veth_pool_show,
1576         .store  = veth_pool_store,
1577 };
1578
1579 static struct kobj_type ktype_veth_pool = {
1580         .release        = NULL,
1581         .sysfs_ops      = &veth_pool_ops,
1582         .default_attrs  = veth_pool_attrs,
1583 };
1584
1585
1586 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
1587         { "network", "IBM,l-lan"},
1588         { "", "" }
1589 };
1590 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1591
1592 static struct vio_driver ibmveth_driver = {
1593         .id_table       = ibmveth_device_table,
1594         .probe          = ibmveth_probe,
1595         .remove         = ibmveth_remove,
1596         .get_desired_dma = ibmveth_get_desired_dma,
1597         .driver         = {
1598                 .name   = ibmveth_driver_name,
1599                 .owner  = THIS_MODULE,
1600         }
1601 };
1602
1603 static int __init ibmveth_module_init(void)
1604 {
1605         ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version);
1606
1607         ibmveth_proc_register_driver();
1608
1609         return vio_register_driver(&ibmveth_driver);
1610 }
1611
1612 static void __exit ibmveth_module_exit(void)
1613 {
1614         vio_unregister_driver(&ibmveth_driver);
1615         ibmveth_proc_unregister_driver();
1616 }
1617
1618 module_init(ibmveth_module_init);
1619 module_exit(ibmveth_module_exit);