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

   1 /* File veth.c created by Kyle A. Lucke on Mon Aug  7 2000. */
   2 /*
   3  * IBM eServer iSeries Virtual Ethernet Device Driver
   4  * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
   5  * Substantially cleaned up by:
   6  * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * 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  *
  24  * This module implements the virtual ethernet device for iSeries LPAR
  25  * Linux.  It uses hypervisor message passing to implement an
  26  * ethernet-like network device communicating between partitions on
  27  * the iSeries.
  28  *
  29  * The iSeries LPAR hypervisor currently allows for up to 16 different
  30  * virtual ethernets.  These are all dynamically configurable on
  31  * OS/400 partitions, but dynamic configuration is not supported under
  32  * Linux yet.  An ethXX network device will be created for each
  33  * virtual ethernet this partition is connected to.
  34  *
  35  * - This driver is responsible for routing packets to and from other
  36  *   partitions.  The MAC addresses used by the virtual ethernets
  37  *   contains meaning and must not be modified.
  38  *
  39  * - Having 2 virtual ethernets to the same remote partition DOES NOT
  40  *   double the available bandwidth.  The 2 devices will share the
  41  *   available hypervisor bandwidth.
  42  *
  43  * - If you send a packet to your own mac address, it will just be
  44  *   dropped, you won't get it on the receive side.
  45  *
  46  * - Multicast is implemented by sending the frame frame to every
  47  *   other partition.  It is the responsibility of the receiving
  48  *   partition to filter the addresses desired.
  49  *
  50  * Tunable parameters:
  51  *
  52  * VETH_NUMBUFFERS: This compile time option defaults to 120.  It
  53  * controls how much memory Linux will allocate per remote partition
  54  * it is communicating with.  It can be thought of as the maximum
  55  * number of packets outstanding to a remote partition at a time.
  56  */
  57
  58 #include <linux/config.h>
  59 #include <linux/module.h>
  60 #include <linux/version.h>
  61 #include <linux/types.h>
  62 #include <linux/errno.h>
  63 #include <linux/ioport.h>
  64 #include <linux/kernel.h>
  65 #include <linux/netdevice.h>
  66 #include <linux/etherdevice.h>
  67 #include <linux/skbuff.h>
  68 #include <linux/init.h>
  69 #include <linux/delay.h>
  70 #include <linux/mm.h>
  71 #include <linux/ethtool.h>
  72 #include <asm/iSeries/mf.h>
  73 #include <asm/iSeries/iSeries_pci.h>
  74 #include <asm/uaccess.h>
  75
  76 #include <asm/iSeries/HvLpConfig.h>
  77 #include <asm/iSeries/HvTypes.h>
  78 #include <asm/iSeries/HvLpEvent.h>
  79 #include <asm/iommu.h>
  80 #include <asm/vio.h>
  81
  82 #undef DEBUG
  83
  84 #include "iseries_veth.h"
  85
  86 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
  87 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
  88 MODULE_LICENSE("GPL");
  89
  90 #define VETH_NUMBUFFERS         (120)
  91 #define VETH_ACKTIMEOUT         (1000000) /* microseconds */
  92 #define VETH_MAX_MCAST          (12)
  93
  94 #define VETH_MAX_MTU            (9000)
  95
  96 #if VETH_NUMBUFFERS < 10
  97 #define ACK_THRESHOLD           (1)
  98 #elif VETH_NUMBUFFERS < 20
  99 #define ACK_THRESHOLD           (4)
 100 #elif VETH_NUMBUFFERS < 40
 101 #define ACK_THRESHOLD           (10)
 102 #else
 103 #define ACK_THRESHOLD           (20)
 104 #endif
 105
 106 #define VETH_STATE_SHUTDOWN     (0x0001)
 107 #define VETH_STATE_OPEN         (0x0002)
 108 #define VETH_STATE_RESET        (0x0004)
 109 #define VETH_STATE_SENTMON      (0x0008)
 110 #define VETH_STATE_SENTCAPS     (0x0010)
 111 #define VETH_STATE_GOTCAPACK    (0x0020)
 112 #define VETH_STATE_GOTCAPS      (0x0040)
 113 #define VETH_STATE_SENTCAPACK   (0x0080)
 114 #define VETH_STATE_READY        (0x0100)
 115
 116 struct veth_msg {
 117         struct veth_msg *next;
 118         struct VethFramesData data;
 119         int token;
 120         unsigned long in_use;
 121         struct sk_buff *skb;
 122         struct device *dev;
 123 };
 124
 125 struct veth_lpar_connection {
 126         HvLpIndex remote_lp;
 127         struct work_struct statemachine_wq;
 128         struct veth_msg *msgs;
 129         int num_events;
 130         struct VethCapData local_caps;
 131
 132         struct timer_list ack_timer;
 133
 134         spinlock_t lock;
 135         unsigned long state;
 136         HvLpInstanceId src_inst;
 137         HvLpInstanceId dst_inst;
 138         struct VethLpEvent cap_event, cap_ack_event;
 139         u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
 140         u32 num_pending_acks;
 141
 142         int num_ack_events;
 143         struct VethCapData remote_caps;
 144         u32 ack_timeout;
 145
 146         spinlock_t msg_stack_lock;
 147         struct veth_msg *msg_stack_head;
 148 };
 149
 150 struct veth_port {
 151         struct device *dev;
 152         struct net_device_stats stats;
 153         u64 mac_addr;
 154         HvLpIndexMap lpar_map;
 155
 156         spinlock_t pending_gate;
 157         struct sk_buff *pending_skb;
 158         HvLpIndexMap pending_lpmask;
 159
 160         rwlock_t mcast_gate;
 161         int promiscuous;
 162         int all_mcast;
 163         int num_mcast;
 164         u64 mcast_addr[VETH_MAX_MCAST];
 165 };
 166
 167 static HvLpIndex this_lp;
 168 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
 169 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
 170
 171 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
 172 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
 173 static void veth_flush_pending(struct veth_lpar_connection *cnx);
 174 static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
 175 static void veth_timed_ack(unsigned long connectionPtr);
 176
 177 /*
 178  * Utility functions
 179  */
 180
 181 #define veth_info(fmt, args...) \
 182         printk(KERN_INFO "iseries_veth: " fmt, ## args)
 183
 184 #define veth_error(fmt, args...) \
 185         printk(KERN_ERR "iseries_veth: Error: " fmt, ## args)
 186
 187 #ifdef DEBUG
 188 #define veth_debug(fmt, args...) \
 189         printk(KERN_DEBUG "iseries_veth: " fmt, ## args)
 190 #else
 191 #define veth_debug(fmt, args...) do {} while (0)
 192 #endif
 193
 194 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
 195                                    struct veth_msg *msg)
 196 {
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&cnx->msg_stack_lock, flags);
 200         msg->next = cnx->msg_stack_head;
 201         cnx->msg_stack_head = msg;
 202         spin_unlock_irqrestore(&cnx->msg_stack_lock, flags);
 203 }
 204
 205 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
 206 {
 207         unsigned long flags;
 208         struct veth_msg *msg;
 209
 210         spin_lock_irqsave(&cnx->msg_stack_lock, flags);
 211         msg = cnx->msg_stack_head;
 212         if (msg)
 213                 cnx->msg_stack_head = cnx->msg_stack_head->next;
 214         spin_unlock_irqrestore(&cnx->msg_stack_lock, flags);
 215         return msg;
 216 }
 217
 218 static inline HvLpEvent_Rc
 219 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
 220                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
 221                  u64 token,
 222                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
 223 {
 224         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
 225                                              HvLpEvent_Type_VirtualLan,
 226                                              subtype, ackind, acktype,
 227                                              cnx->src_inst,
 228                                              cnx->dst_inst,
 229                                              token, data1, data2, data3,
 230                                              data4, data5);
 231 }
 232
 233 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
 234                                            u16 subtype, u64 token, void *data)
 235 {
 236         u64 *p = (u64 *) data;
 237
 238         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
 239                                 HvLpEvent_AckType_ImmediateAck,
 240                                 token, p[0], p[1], p[2], p[3], p[4]);
 241 }
 242
 243 struct veth_allocation {
 244         struct completion c;
 245         int num;
 246 };
 247
 248 static void veth_complete_allocation(void *parm, int number)
 249 {
 250         struct veth_allocation *vc = (struct veth_allocation *)parm;
 251
 252         vc->num = number;
 253         complete(&vc->c);
 254 }
 255
 256 static int veth_allocate_events(HvLpIndex rlp, int number)
 257 {
 258         struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
 259
 260         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
 261                             sizeof(struct VethLpEvent), number,
 262                             &veth_complete_allocation, &vc);
 263         wait_for_completion(&vc.c);
 264
 265         return vc.num;
 266 }
 267
 268 /*
 269  * LPAR connection code
 270  */
 271
 272 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
 273 {
 274         schedule_work(&cnx->statemachine_wq);
 275 }
 276
 277 static void veth_take_cap(struct veth_lpar_connection *cnx,
 278                           struct VethLpEvent *event)
 279 {
 280         unsigned long flags;
 281
 282         spin_lock_irqsave(&cnx->lock, flags);
 283         /* Receiving caps may mean the other end has just come up, so
 284          * we need to reload the instance ID of the far end */
 285         cnx->dst_inst =
 286                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
 287                                                   HvLpEvent_Type_VirtualLan);
 288
 289         if (cnx->state & VETH_STATE_GOTCAPS) {
 290                 veth_error("Received a second capabilities from LPAR %d.\n",
 291                            cnx->remote_lp);
 292                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
 293                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
 294         } else {
 295                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
 296                 cnx->state |= VETH_STATE_GOTCAPS;
 297                 veth_kick_statemachine(cnx);
 298         }
 299         spin_unlock_irqrestore(&cnx->lock, flags);
 300 }
 301
 302 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
 303                               struct VethLpEvent *event)
 304 {
 305         unsigned long flags;
 306
 307         spin_lock_irqsave(&cnx->lock, flags);
 308         if (cnx->state & VETH_STATE_GOTCAPACK) {
 309                 veth_error("Received a second capabilities ack from LPAR %d.\n",
 310                            cnx->remote_lp);
 311         } else {
 312                 memcpy(&cnx->cap_ack_event, event,
 313                        sizeof(&cnx->cap_ack_event));
 314                 cnx->state |= VETH_STATE_GOTCAPACK;
 315                 veth_kick_statemachine(cnx);
 316         }
 317         spin_unlock_irqrestore(&cnx->lock, flags);
 318 }
 319
 320 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
 321                                   struct VethLpEvent *event)
 322 {
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&cnx->lock, flags);
 326         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
 327
 328         /* Avoid kicking the statemachine once we're shutdown.
 329          * It's unnecessary and it could break veth_stop_connection(). */
 330
 331         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
 332                 cnx->state |= VETH_STATE_RESET;
 333                 veth_kick_statemachine(cnx);
 334         }
 335         spin_unlock_irqrestore(&cnx->lock, flags);
 336 }
 337
 338 static void veth_handle_ack(struct VethLpEvent *event)
 339 {
 340         HvLpIndex rlp = event->base_event.xTargetLp;
 341         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 342
 343         BUG_ON(! cnx);
 344
 345         switch (event->base_event.xSubtype) {
 346         case VethEventTypeCap:
 347                 veth_take_cap_ack(cnx, event);
 348                 break;
 349         case VethEventTypeMonitor:
 350                 veth_take_monitor_ack(cnx, event);
 351                 break;
 352         default:
 353                 veth_error("Unknown ack type %d from LPAR %d.\n",
 354                                 event->base_event.xSubtype, rlp);
 355         };
 356 }
 357
 358 static void veth_handle_int(struct VethLpEvent *event)
 359 {
 360         HvLpIndex rlp = event->base_event.xSourceLp;
 361         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 362         unsigned long flags;
 363         int i;
 364
 365         BUG_ON(! cnx);
 366
 367         switch (event->base_event.xSubtype) {
 368         case VethEventTypeCap:
 369                 veth_take_cap(cnx, event);
 370                 break;
 371         case VethEventTypeMonitor:
 372                 /* do nothing... this'll hang out here til we're dead,
 373                  * and the hypervisor will return it for us. */
 374                 break;
 375         case VethEventTypeFramesAck:
 376                 spin_lock_irqsave(&cnx->lock, flags);
 377                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
 378                         u16 msgnum = event->u.frames_ack_data.token[i];
 379
 380                         if (msgnum < VETH_NUMBUFFERS)
 381                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
 382                 }
 383                 spin_unlock_irqrestore(&cnx->lock, flags);
 384                 veth_flush_pending(cnx);
 385                 break;
 386         case VethEventTypeFrames:
 387                 veth_receive(cnx, event);
 388                 break;
 389         default:
 390                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
 391                                 event->base_event.xSubtype, rlp);
 392         };
 393 }
 394
 395 static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
 396 {
 397         struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
 398
 399         if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
 400                 veth_handle_ack(veth_event);
 401         else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
 402                 veth_handle_int(veth_event);
 403 }
 404
 405 static int veth_process_caps(struct veth_lpar_connection *cnx)
 406 {
 407         struct VethCapData *remote_caps = &cnx->remote_caps;
 408         int num_acks_needed;
 409
 410         /* Convert timer to jiffies */
 411         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
 412
 413         if ( (remote_caps->num_buffers == 0)
 414              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
 415              || (remote_caps->ack_threshold == 0)
 416              || (cnx->ack_timeout == 0) ) {
 417                 veth_error("Received incompatible capabilities from LPAR %d.\n",
 418                                 cnx->remote_lp);
 419                 return HvLpEvent_Rc_InvalidSubtypeData;
 420         }
 421
 422         num_acks_needed = (remote_caps->num_buffers
 423                            / remote_caps->ack_threshold) + 1;
 424
 425         /* FIXME: locking on num_ack_events? */
 426         if (cnx->num_ack_events < num_acks_needed) {
 427                 int num;
 428
 429                 num = veth_allocate_events(cnx->remote_lp,
 430                                            num_acks_needed-cnx->num_ack_events);
 431                 if (num > 0)
 432                         cnx->num_ack_events += num;
 433
 434                 if (cnx->num_ack_events < num_acks_needed) {
 435                         veth_error("Couldn't allocate enough ack events "
 436                                         "for LPAR %d.\n", cnx->remote_lp);
 437
 438                         return HvLpEvent_Rc_BufferNotAvailable;
 439                 }
 440         }
 441
 442
 443         return HvLpEvent_Rc_Good;
 444 }
 445
 446 /* FIXME: The gotos here are a bit dubious */
 447 static void veth_statemachine(void *p)
 448 {
 449         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
 450         int rlp = cnx->remote_lp;
 451         int rc;
 452
 453         spin_lock_irq(&cnx->lock);
 454
 455  restart:
 456         if (cnx->state & VETH_STATE_RESET) {
 457                 int i;
 458
 459                 if (cnx->state & VETH_STATE_OPEN)
 460                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
 461                                                      HvLpEvent_Type_VirtualLan);
 462
 463                 /*
 464                  * Reset ack data. This prevents the ack_timer actually
 465                  * doing anything, even if it runs one more time when
 466                  * we drop the lock below.
 467                  */
 468                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 469                 cnx->num_pending_acks = 0;
 470
 471                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
 472                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
 473                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
 474                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
 475
 476                 /* Clean up any leftover messages */
 477                 if (cnx->msgs)
 478                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
 479                                 veth_recycle_msg(cnx, cnx->msgs + i);
 480
 481                 /* Drop the lock so we can do stuff that might sleep or
 482                  * take other locks. */
 483                 spin_unlock_irq(&cnx->lock);
 484
 485                 del_timer_sync(&cnx->ack_timer);
 486                 veth_flush_pending(cnx);
 487
 488                 spin_lock_irq(&cnx->lock);
 489
 490                 if (cnx->state & VETH_STATE_RESET)
 491                         goto restart;
 492
 493                 /* Hack, wait for the other end to reset itself. */
 494                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
 495                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
 496                         goto out;
 497                 }
 498         }
 499
 500         if (cnx->state & VETH_STATE_SHUTDOWN)
 501                 /* It's all over, do nothing */
 502                 goto out;
 503
 504         if ( !(cnx->state & VETH_STATE_OPEN) ) {
 505                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
 506                         goto cant_cope;
 507
 508                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
 509                 cnx->src_inst =
 510                         HvCallEvent_getSourceLpInstanceId(rlp,
 511                                                           HvLpEvent_Type_VirtualLan);
 512                 cnx->dst_inst =
 513                         HvCallEvent_getTargetLpInstanceId(rlp,
 514                                                           HvLpEvent_Type_VirtualLan);
 515                 cnx->state |= VETH_STATE_OPEN;
 516         }
 517
 518         if ( (cnx->state & VETH_STATE_OPEN)
 519              && !(cnx->state & VETH_STATE_SENTMON) ) {
 520                 rc = veth_signalevent(cnx, VethEventTypeMonitor,
 521                                       HvLpEvent_AckInd_DoAck,
 522                                       HvLpEvent_AckType_DeferredAck,
 523                                       0, 0, 0, 0, 0, 0);
 524
 525                 if (rc == HvLpEvent_Rc_Good) {
 526                         cnx->state |= VETH_STATE_SENTMON;
 527                 } else {
 528                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 529                              && (rc != HvLpEvent_Rc_PathClosed) )
 530                                 veth_error("Error sending monitor to LPAR %d, "
 531                                                 "rc = %d\n", rlp, rc);
 532
 533                         /* Oh well, hope we get a cap from the other
 534                          * end and do better when that kicks us */
 535                         goto out;
 536                 }
 537         }
 538
 539         if ( (cnx->state & VETH_STATE_OPEN)
 540              && !(cnx->state & VETH_STATE_SENTCAPS)) {
 541                 u64 *rawcap = (u64 *)&cnx->local_caps;
 542
 543                 rc = veth_signalevent(cnx, VethEventTypeCap,
 544                                       HvLpEvent_AckInd_DoAck,
 545                                       HvLpEvent_AckType_ImmediateAck,
 546                                       0, rawcap[0], rawcap[1], rawcap[2],
 547                                       rawcap[3], rawcap[4]);
 548
 549                 if (rc == HvLpEvent_Rc_Good) {
 550                         cnx->state |= VETH_STATE_SENTCAPS;
 551                 } else {
 552                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 553                              && (rc != HvLpEvent_Rc_PathClosed) )
 554                                 veth_error("Error sending caps to LPAR %d, "
 555                                                 "rc = %d\n", rlp, rc);
 556
 557                         /* Oh well, hope we get a cap from the other
 558                          * end and do better when that kicks us */
 559                         goto out;
 560                 }
 561         }
 562
 563         if ((cnx->state & VETH_STATE_GOTCAPS)
 564             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
 565                 struct VethCapData *remote_caps = &cnx->remote_caps;
 566
 567                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
 568                        sizeof(*remote_caps));
 569
 570                 spin_unlock_irq(&cnx->lock);
 571                 rc = veth_process_caps(cnx);
 572                 spin_lock_irq(&cnx->lock);
 573
 574                 /* We dropped the lock, so recheck for anything which
 575                  * might mess us up */
 576                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
 577                         goto restart;
 578
 579                 cnx->cap_event.base_event.xRc = rc;
 580                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
 581                 if (rc == HvLpEvent_Rc_Good)
 582                         cnx->state |= VETH_STATE_SENTCAPACK;
 583                 else
 584                         goto cant_cope;
 585         }
 586
 587         if ((cnx->state & VETH_STATE_GOTCAPACK)
 588             && (cnx->state & VETH_STATE_GOTCAPS)
 589             && !(cnx->state & VETH_STATE_READY)) {
 590                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
 591                         /* Start the ACK timer */
 592                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
 593                         add_timer(&cnx->ack_timer);
 594                         cnx->state |= VETH_STATE_READY;
 595                 } else {
 596                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
 597                                         rlp, cnx->cap_ack_event.base_event.xRc);
 598                         goto cant_cope;
 599                 }
 600         }
 601
 602  out:
 603         spin_unlock_irq(&cnx->lock);
 604         return;
 605
 606  cant_cope:
 607         /* FIXME: we get here if something happens we really can't
 608          * cope with.  The link will never work once we get here, and
 609          * all we can do is not lock the rest of the system up */
 610         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
 611                         " (state = 0x%04lx)\n", rlp, cnx->state);
 612         cnx->state |= VETH_STATE_SHUTDOWN;
 613         spin_unlock_irq(&cnx->lock);
 614 }
 615
 616 static int veth_init_connection(u8 rlp)
 617 {
 618         struct veth_lpar_connection *cnx;
 619         struct veth_msg *msgs;
 620         int i;
 621
 622         if ( (rlp == this_lp)
 623              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
 624                 return 0;
 625
 626         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
 627         if (! cnx)
 628                 return -ENOMEM;
 629         memset(cnx, 0, sizeof(*cnx));
 630
 631         cnx->remote_lp = rlp;
 632         spin_lock_init(&cnx->lock);
 633         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
 634         init_timer(&cnx->ack_timer);
 635         cnx->ack_timer.function = veth_timed_ack;
 636         cnx->ack_timer.data = (unsigned long) cnx;
 637         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 638
 639         veth_cnx[rlp] = cnx;
 640
 641         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
 642         if (! msgs) {
 643                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
 644                 return -ENOMEM;
 645         }
 646
 647         cnx->msgs = msgs;
 648         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
 649         spin_lock_init(&cnx->msg_stack_lock);
 650
 651         for (i = 0; i < VETH_NUMBUFFERS; i++) {
 652                 msgs[i].token = i;
 653                 veth_stack_push(cnx, msgs + i);
 654         }
 655
 656         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
 657
 658         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
 659                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
 660                 return -ENOMEM;
 661         }
 662
 663         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
 664         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
 665         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
 666
 667         return 0;
 668 }
 669
 670 static void veth_stop_connection(u8 rlp)
 671 {
 672         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 673
 674         if (! cnx)
 675                 return;
 676
 677         spin_lock_irq(&cnx->lock);
 678         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
 679         veth_kick_statemachine(cnx);
 680         spin_unlock_irq(&cnx->lock);
 681
 682         /* There's a slim chance the reset code has just queued the
 683          * statemachine to run in five seconds. If so we need to cancel
 684          * that and requeue the work to run now. */
 685         if (cancel_delayed_work(&cnx->statemachine_wq)) {
 686                 spin_lock_irq(&cnx->lock);
 687                 veth_kick_statemachine(cnx);
 688                 spin_unlock_irq(&cnx->lock);
 689         }
 690
 691         /* Wait for the state machine to run. */
 692         flush_scheduled_work();
 693
 694         if (cnx->num_events > 0)
 695                 mf_deallocate_lp_events(cnx->remote_lp,
 696                                       HvLpEvent_Type_VirtualLan,
 697                                       cnx->num_events,
 698                                       NULL, NULL);
 699         if (cnx->num_ack_events > 0)
 700                 mf_deallocate_lp_events(cnx->remote_lp,
 701                                       HvLpEvent_Type_VirtualLan,
 702                                       cnx->num_ack_events,
 703                                       NULL, NULL);
 704 }
 705
 706 static void veth_destroy_connection(u8 rlp)
 707 {
 708         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 709
 710         if (! cnx)
 711                 return;
 712
 713         kfree(cnx->msgs);
 714         kfree(cnx);
 715         veth_cnx[rlp] = NULL;
 716 }
 717
 718 /*
 719  * net_device code
 720  */
 721
 722 static int veth_open(struct net_device *dev)
 723 {
 724         struct veth_port *port = (struct veth_port *) dev->priv;
 725
 726         memset(&port->stats, 0, sizeof (port->stats));
 727         netif_start_queue(dev);
 728         return 0;
 729 }
 730
 731 static int veth_close(struct net_device *dev)
 732 {
 733         netif_stop_queue(dev);
 734         return 0;
 735 }
 736
 737 static struct net_device_stats *veth_get_stats(struct net_device *dev)
 738 {
 739         struct veth_port *port = (struct veth_port *) dev->priv;
 740
 741         return &port->stats;
 742 }
 743
 744 static int veth_change_mtu(struct net_device *dev, int new_mtu)
 745 {
 746         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
 747                 return -EINVAL;
 748         dev->mtu = new_mtu;
 749         return 0;
 750 }
 751
 752 static void veth_set_multicast_list(struct net_device *dev)
 753 {
 754         struct veth_port *port = (struct veth_port *) dev->priv;
 755         unsigned long flags;
 756
 757         write_lock_irqsave(&port->mcast_gate, flags);
 758
 759         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 760                 printk(KERN_INFO "%s: Promiscuous mode enabled.\n",
 761                        dev->name);
 762                 port->promiscuous = 1;
 763         } else if ( (dev->flags & IFF_ALLMULTI)
 764                     || (dev->mc_count > VETH_MAX_MCAST) ) {
 765                 port->all_mcast = 1;
 766         } else {
 767                 struct dev_mc_list *dmi = dev->mc_list;
 768                 int i;
 769
 770                 /* Update table */
 771                 port->num_mcast = 0;
 772
 773                 for (i = 0; i < dev->mc_count; i++) {
 774                         u8 *addr = dmi->dmi_addr;
 775                         u64 xaddr = 0;
 776
 777                         if (addr[0] & 0x01) {/* multicast address? */
 778                                 memcpy(&xaddr, addr, ETH_ALEN);
 779                                 port->mcast_addr[port->num_mcast] = xaddr;
 780                                 port->num_mcast++;
 781                         }
 782                         dmi = dmi->next;
 783                 }
 784         }
 785
 786         write_unlock_irqrestore(&port->mcast_gate, flags);
 787 }
 788
 789 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 790 {
 791         strncpy(info->driver, "veth", sizeof(info->driver) - 1);
 792         info->driver[sizeof(info->driver) - 1] = '\0';
 793         strncpy(info->version, "1.0", sizeof(info->version) - 1);
 794 }
 795
 796 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 797 {
 798         ecmd->supported = (SUPPORTED_1000baseT_Full
 799                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 800         ecmd->advertising = (SUPPORTED_1000baseT_Full
 801                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 802         ecmd->port = PORT_FIBRE;
 803         ecmd->transceiver = XCVR_INTERNAL;
 804         ecmd->phy_address = 0;
 805         ecmd->speed = SPEED_1000;
 806         ecmd->duplex = DUPLEX_FULL;
 807         ecmd->autoneg = AUTONEG_ENABLE;
 808         ecmd->maxtxpkt = 120;
 809         ecmd->maxrxpkt = 120;
 810         return 0;
 811 }
 812
 813 static u32 veth_get_link(struct net_device *dev)
 814 {
 815         return 1;
 816 }
 817
 818 static struct ethtool_ops ops = {
 819         .get_drvinfo = veth_get_drvinfo,
 820         .get_settings = veth_get_settings,
 821         .get_link = veth_get_link,
 822 };
 823
 824 static void veth_tx_timeout(struct net_device *dev)
 825 {
 826         struct veth_port *port = (struct veth_port *)dev->priv;
 827         struct net_device_stats *stats = &port->stats;
 828         unsigned long flags;
 829         int i;
 830
 831         stats->tx_errors++;
 832
 833         spin_lock_irqsave(&port->pending_gate, flags);
 834
 835         if (!port->pending_lpmask) {
 836                 spin_unlock_irqrestore(&port->pending_gate, flags);
 837                 return;
 838         }
 839
 840         printk(KERN_WARNING "%s: Tx timeout!  Resetting lp connections: %08x\n",
 841                dev->name, port->pending_lpmask);
 842
 843         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
 844                 struct veth_lpar_connection *cnx = veth_cnx[i];
 845
 846                 if (! (port->pending_lpmask & (1<<i)))
 847                         continue;
 848
 849                 /* If we're pending on it, we must be connected to it,
 850                  * so we should certainly have a structure for it. */
 851                 BUG_ON(! cnx);
 852
 853                 /* Theoretically we could be kicking a connection
 854                  * which doesn't deserve it, but in practice if we've
 855                  * had a Tx timeout, the pending_lpmask will have
 856                  * exactly one bit set - the connection causing the
 857                  * problem. */
 858                 spin_lock(&cnx->lock);
 859                 cnx->state |= VETH_STATE_RESET;
 860                 veth_kick_statemachine(cnx);
 861                 spin_unlock(&cnx->lock);
 862         }
 863
 864         spin_unlock_irqrestore(&port->pending_gate, flags);
 865 }
 866
 867 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
 868 {
 869         struct net_device *dev;
 870         struct veth_port *port;
 871         int i, rc;
 872
 873         dev = alloc_etherdev(sizeof (struct veth_port));
 874         if (! dev) {
 875                 veth_error("Unable to allocate net_device structure!\n");
 876                 return NULL;
 877         }
 878
 879         port = (struct veth_port *) dev->priv;
 880
 881         spin_lock_init(&port->pending_gate);
 882         rwlock_init(&port->mcast_gate);
 883
 884         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
 885                 HvLpVirtualLanIndexMap map;
 886
 887                 if (i == this_lp)
 888                         continue;
 889                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
 890                 if (map & (0x8000 >> vlan))
 891                         port->lpar_map |= (1 << i);
 892         }
 893         port->dev = vdev;
 894
 895         dev->dev_addr[0] = 0x02;
 896         dev->dev_addr[1] = 0x01;
 897         dev->dev_addr[2] = 0xff;
 898         dev->dev_addr[3] = vlan;
 899         dev->dev_addr[4] = 0xff;
 900         dev->dev_addr[5] = this_lp;
 901
 902         dev->mtu = VETH_MAX_MTU;
 903
 904         memcpy(&port->mac_addr, dev->dev_addr, 6);
 905
 906         dev->open = veth_open;
 907         dev->hard_start_xmit = veth_start_xmit;
 908         dev->stop = veth_close;
 909         dev->get_stats = veth_get_stats;
 910         dev->change_mtu = veth_change_mtu;
 911         dev->set_mac_address = NULL;
 912         dev->set_multicast_list = veth_set_multicast_list;
 913         SET_ETHTOOL_OPS(dev, &ops);
 914
 915         dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000);
 916         dev->tx_timeout = veth_tx_timeout;
 917
 918         SET_NETDEV_DEV(dev, vdev);
 919
 920         rc = register_netdev(dev);
 921         if (rc != 0) {
 922                 veth_error("Failed registering net device for vlan%d.\n", vlan);
 923                 free_netdev(dev);
 924                 return NULL;
 925         }
 926
 927         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
 928                         dev->name, vlan, port->lpar_map);
 929
 930         return dev;
 931 }
 932
 933 /*
 934  * Tx path
 935  */
 936
 937 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
 938                                 struct net_device *dev)
 939 {
 940         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 941         struct veth_port *port = (struct veth_port *) dev->priv;
 942         HvLpEvent_Rc rc;
 943         u32 dma_address, dma_length;
 944         struct veth_msg *msg = NULL;
 945         int err = 0;
 946         unsigned long flags;
 947
 948         if (! cnx) {
 949                 port->stats.tx_errors++;
 950                 dev_kfree_skb(skb);
 951                 return 0;
 952         }
 953
 954         spin_lock_irqsave(&cnx->lock, flags);
 955
 956         if (! (cnx->state & VETH_STATE_READY))
 957                 goto drop;
 958
 959         if ((skb->len - 14) > VETH_MAX_MTU)
 960                 goto drop;
 961
 962         msg = veth_stack_pop(cnx);
 963
 964         if (! msg) {
 965                 err = 1;
 966                 goto drop;
 967         }
 968
 969         dma_length = skb->len;
 970         dma_address = dma_map_single(port->dev, skb->data,
 971                                      dma_length, DMA_TO_DEVICE);
 972
 973         if (dma_mapping_error(dma_address))
 974                 goto recycle_and_drop;
 975
 976         /* Is it really necessary to check the length and address
 977          * fields of the first entry here? */
 978         msg->skb = skb;
 979         msg->dev = port->dev;
 980         msg->data.addr[0] = dma_address;
 981         msg->data.len[0] = dma_length;
 982         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
 983         set_bit(0, &(msg->in_use));
 984         rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
 985
 986         if (rc != HvLpEvent_Rc_Good)
 987                 goto recycle_and_drop;
 988
 989         spin_unlock_irqrestore(&cnx->lock, flags);
 990         return 0;
 991
 992  recycle_and_drop:
 993         msg->skb = NULL;
 994         /* need to set in use to make veth_recycle_msg in case this
 995          * was a mapping failure */
 996         set_bit(0, &msg->in_use);
 997         veth_recycle_msg(cnx, msg);
 998  drop:
 999         port->stats.tx_errors++;
1000         dev_kfree_skb(skb);
1001         spin_unlock_irqrestore(&cnx->lock, flags);
1002         return err;
1003 }
1004
1005 static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
1006                                           HvLpIndexMap lpmask,
1007                                           struct net_device *dev)
1008 {
1009         struct veth_port *port = (struct veth_port *) dev->priv;
1010         int i;
1011         int rc;
1012
1013         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1014                 if ((lpmask & (1 << i)) == 0)
1015                         continue;
1016
1017                 rc = veth_transmit_to_one(skb_get(skb), i, dev);
1018                 if (! rc)
1019                         lpmask &= ~(1<<i);
1020         }
1021
1022         if (! lpmask) {
1023                 port->stats.tx_packets++;
1024                 port->stats.tx_bytes += skb->len;
1025         }
1026
1027         return lpmask;
1028 }
1029
1030 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1031 {
1032         unsigned char *frame = skb->data;
1033         struct veth_port *port = (struct veth_port *) dev->priv;
1034         unsigned long flags;
1035         HvLpIndexMap lpmask;
1036
1037         if (! (frame[0] & 0x01)) {
1038                 /* unicast packet */
1039                 HvLpIndex rlp = frame[5];
1040
1041                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1042                         dev_kfree_skb(skb);
1043                         return 0;
1044                 }
1045
1046                 lpmask = 1 << rlp;
1047         } else {
1048                 lpmask = port->lpar_map;
1049         }
1050
1051         spin_lock_irqsave(&port->pending_gate, flags);
1052
1053         lpmask = veth_transmit_to_many(skb, lpmask, dev);
1054
1055         dev->trans_start = jiffies;
1056
1057         if (! lpmask) {
1058                 dev_kfree_skb(skb);
1059         } else {
1060                 if (port->pending_skb) {
1061                         veth_error("%s: TX while skb was pending!\n",
1062                                    dev->name);
1063                         dev_kfree_skb(skb);
1064                         spin_unlock_irqrestore(&port->pending_gate, flags);
1065                         return 1;
1066                 }
1067
1068                 port->pending_skb = skb;
1069                 port->pending_lpmask = lpmask;
1070                 netif_stop_queue(dev);
1071         }
1072
1073         spin_unlock_irqrestore(&port->pending_gate, flags);
1074
1075         return 0;
1076 }
1077
1078 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1079                              struct veth_msg *msg)
1080 {
1081         u32 dma_address, dma_length;
1082
1083         if (test_and_clear_bit(0, &msg->in_use)) {
1084                 dma_address = msg->data.addr[0];
1085                 dma_length = msg->data.len[0];
1086
1087                 dma_unmap_single(msg->dev, dma_address, dma_length,
1088                                  DMA_TO_DEVICE);
1089
1090                 if (msg->skb) {
1091                         dev_kfree_skb_any(msg->skb);
1092                         msg->skb = NULL;
1093                 }
1094
1095                 memset(&msg->data, 0, sizeof(msg->data));
1096                 veth_stack_push(cnx, msg);
1097         } else if (cnx->state & VETH_STATE_OPEN) {
1098                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1099                                 cnx->remote_lp, msg->token);
1100         }
1101 }
1102
1103 static void veth_flush_pending(struct veth_lpar_connection *cnx)
1104 {
1105         int i;
1106         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1107                 struct net_device *dev = veth_dev[i];
1108                 struct veth_port *port;
1109                 unsigned long flags;
1110
1111                 if (! dev)
1112                         continue;
1113
1114                 port = (struct veth_port *)dev->priv;
1115
1116                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1117                         continue;
1118
1119                 spin_lock_irqsave(&port->pending_gate, flags);
1120                 if (port->pending_skb) {
1121                         port->pending_lpmask =
1122                                 veth_transmit_to_many(port->pending_skb,
1123                                                       port->pending_lpmask,
1124                                                       dev);
1125                         if (! port->pending_lpmask) {
1126                                 dev_kfree_skb_any(port->pending_skb);
1127                                 port->pending_skb = NULL;
1128                                 netif_wake_queue(dev);
1129                         }
1130                 }
1131                 spin_unlock_irqrestore(&port->pending_gate, flags);
1132         }
1133 }
1134
1135 /*
1136  * Rx path
1137  */
1138
1139 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1140 {
1141         int wanted = 0;
1142         int i;
1143         unsigned long flags;
1144
1145         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1146                 return 1;
1147
1148         if (! (((char *) &mac_addr)[0] & 0x01))
1149                 return 0;
1150
1151         read_lock_irqsave(&port->mcast_gate, flags);
1152
1153         if (port->promiscuous || port->all_mcast) {
1154                 wanted = 1;
1155                 goto out;
1156         }
1157
1158         for (i = 0; i < port->num_mcast; ++i) {
1159                 if (port->mcast_addr[i] == mac_addr) {
1160                         wanted = 1;
1161                         break;
1162                 }
1163         }
1164
1165  out:
1166         read_unlock_irqrestore(&port->mcast_gate, flags);
1167
1168         return wanted;
1169 }
1170
1171 struct dma_chunk {
1172         u64 addr;
1173         u64 size;
1174 };
1175
1176 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1177
1178 static inline void veth_build_dma_list(struct dma_chunk *list,
1179                                        unsigned char *p, unsigned long length)
1180 {
1181         unsigned long done;
1182         int i = 1;
1183
1184         /* FIXME: skbs are continguous in real addresses.  Do we
1185          * really need to break it into PAGE_SIZE chunks, or can we do
1186          * it just at the granularity of iSeries real->absolute
1187          * mapping?  Indeed, given the way the allocator works, can we
1188          * count on them being absolutely contiguous? */
1189         list[0].addr = ISERIES_HV_ADDR(p);
1190         list[0].size = min(length,
1191                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1192
1193         done = list[0].size;
1194         while (done < length) {
1195                 list[i].addr = ISERIES_HV_ADDR(p + done);
1196                 list[i].size = min(length-done, PAGE_SIZE);
1197                 done += list[i].size;
1198                 i++;
1199         }
1200 }
1201
1202 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1203 {
1204         HvLpEvent_Rc rc;
1205
1206         rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1207                              0, &cnx->pending_acks);
1208
1209         if (rc != HvLpEvent_Rc_Good)
1210                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1211                                 cnx->remote_lp, (int)rc);
1212
1213         cnx->num_pending_acks = 0;
1214         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1215 }
1216
1217 static void veth_receive(struct veth_lpar_connection *cnx,
1218                          struct VethLpEvent *event)
1219 {
1220         struct VethFramesData *senddata = &event->u.frames_data;
1221         int startchunk = 0;
1222         int nchunks;
1223         unsigned long flags;
1224         HvLpDma_Rc rc;
1225
1226         do {
1227                 u16 length = 0;
1228                 struct sk_buff *skb;
1229                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1230                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1231                 u64 dest;
1232                 HvLpVirtualLanIndex vlan;
1233                 struct net_device *dev;
1234                 struct veth_port *port;
1235
1236                 /* FIXME: do we need this? */
1237                 memset(local_list, 0, sizeof(local_list));
1238                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1239
1240                 /* a 0 address marks the end of the valid entries */
1241                 if (senddata->addr[startchunk] == 0)
1242                         break;
1243
1244                 /* make sure that we have at least 1 EOF entry in the
1245                  * remaining entries */
1246                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1247                         veth_error("Missing EOF fragment in event "
1248                                         "eofmask = 0x%x startchunk = %d\n",
1249                                         (unsigned)senddata->eofmask,
1250                                         startchunk);
1251                         break;
1252                 }
1253
1254                 /* build list of chunks in this frame */
1255                 nchunks = 0;
1256                 do {
1257                         remote_list[nchunks].addr =
1258                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1259                         remote_list[nchunks].size =
1260                                 senddata->len[startchunk+nchunks];
1261                         length += remote_list[nchunks].size;
1262                 } while (! (senddata->eofmask &
1263                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1264
1265                 /* length == total length of all chunks */
1266                 /* nchunks == # of chunks in this frame */
1267
1268                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1269                         veth_error("Received oversize frame from LPAR %d "
1270                                         "(length = %d)\n",
1271                                         cnx->remote_lp, length);
1272                         continue;
1273                 }
1274
1275                 skb = alloc_skb(length, GFP_ATOMIC);
1276                 if (!skb)
1277                         continue;
1278
1279                 veth_build_dma_list(local_list, skb->data, length);
1280
1281                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1282                                             event->base_event.xSourceLp,
1283                                             HvLpDma_Direction_RemoteToLocal,
1284                                             cnx->src_inst,
1285                                             cnx->dst_inst,
1286                                             HvLpDma_AddressType_RealAddress,
1287                                             HvLpDma_AddressType_TceIndex,
1288                                             ISERIES_HV_ADDR(&local_list),
1289                                             ISERIES_HV_ADDR(&remote_list),
1290                                             length);
1291                 if (rc != HvLpDma_Rc_Good) {
1292                         dev_kfree_skb_irq(skb);
1293                         continue;
1294                 }
1295
1296                 vlan = skb->data[9];
1297                 dev = veth_dev[vlan];
1298                 if (! dev) {
1299                         /*
1300                          * Some earlier versions of the driver sent
1301                          * broadcasts down all connections, even to lpars
1302                          * that weren't on the relevant vlan. So ignore
1303                          * packets belonging to a vlan we're not on.
1304                          * We can also be here if we receive packets while
1305                          * the driver is going down, because then dev is NULL.
1306                          */
1307                         dev_kfree_skb_irq(skb);
1308                         continue;
1309                 }
1310
1311                 port = (struct veth_port *)dev->priv;
1312                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1313
1314                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1315                         dev_kfree_skb_irq(skb);
1316                         continue;
1317                 }
1318                 if (! veth_frame_wanted(port, dest)) {
1319                         dev_kfree_skb_irq(skb);
1320                         continue;
1321                 }
1322
1323                 skb_put(skb, length);
1324                 skb->dev = dev;
1325                 skb->protocol = eth_type_trans(skb, dev);
1326                 skb->ip_summed = CHECKSUM_NONE;
1327                 netif_rx(skb);  /* send it up */
1328                 port->stats.rx_packets++;
1329                 port->stats.rx_bytes += length;
1330         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1331
1332         /* Ack it */
1333         spin_lock_irqsave(&cnx->lock, flags);
1334         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1335
1336         cnx->pending_acks[cnx->num_pending_acks++] =
1337                 event->base_event.xCorrelationToken;
1338
1339         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1340              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1341                 veth_flush_acks(cnx);
1342
1343         spin_unlock_irqrestore(&cnx->lock, flags);
1344 }
1345
1346 static void veth_timed_ack(unsigned long ptr)
1347 {
1348         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1349         unsigned long flags;
1350
1351         /* Ack all the events */
1352         spin_lock_irqsave(&cnx->lock, flags);
1353         if (cnx->num_pending_acks > 0)
1354                 veth_flush_acks(cnx);
1355
1356         /* Reschedule the timer */
1357         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1358         add_timer(&cnx->ack_timer);
1359         spin_unlock_irqrestore(&cnx->lock, flags);
1360 }
1361
1362 static int veth_remove(struct vio_dev *vdev)
1363 {
1364         int i = vdev->unit_address;
1365         struct net_device *dev;
1366
1367         dev = veth_dev[i];
1368         if (dev != NULL) {
1369                 veth_dev[i] = NULL;
1370                 unregister_netdev(dev);
1371                 free_netdev(dev);
1372         }
1373         return 0;
1374 }
1375
1376 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1377 {
1378         int i = vdev->unit_address;
1379         struct net_device *dev;
1380
1381         dev = veth_probe_one(i, &vdev->dev);
1382         if (dev == NULL) {
1383                 veth_remove(vdev);
1384                 return 1;
1385         }
1386         veth_dev[i] = dev;
1387
1388         /* Start the state machine on each connection, to commence
1389          * link negotiation */
1390         for (i = 0; i < HVMAXARCHITECTEDLPS; i++)
1391                 if (veth_cnx[i])
1392                         veth_kick_statemachine(veth_cnx[i]);
1393
1394         return 0;
1395 }
1396
1397 /**
1398  * veth_device_table: Used by vio.c to match devices that we
1399  * support.
1400  */
1401 static struct vio_device_id veth_device_table[] __devinitdata = {
1402         { "vlan", "" },
1403         { "", "" }
1404 };
1405 MODULE_DEVICE_TABLE(vio, veth_device_table);
1406
1407 static struct vio_driver veth_driver = {
1408         .name = "iseries_veth",
1409         .id_table = veth_device_table,
1410         .probe = veth_probe,
1411         .remove = veth_remove
1412 };
1413
1414 /*
1415  * Module initialization/cleanup
1416  */
1417
1418 void __exit veth_module_cleanup(void)
1419 {
1420         int i;
1421
1422         /* Stop the queues first to stop any new packets being sent. */
1423         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++)
1424                 if (veth_dev[i])
1425                         netif_stop_queue(veth_dev[i]);
1426
1427         /* Stop the connections before we unregister the driver. This
1428          * ensures there's no skbs lying around holding the device open. */
1429         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1430                 veth_stop_connection(i);
1431
1432         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1433
1434         /* Hypervisor callbacks may have scheduled more work while we
1435          * were stoping connections. Now that we've disconnected from
1436          * the hypervisor make sure everything's finished. */
1437         flush_scheduled_work();
1438
1439         vio_unregister_driver(&veth_driver);
1440
1441         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1442                 veth_destroy_connection(i);
1443
1444 }
1445 module_exit(veth_module_cleanup);
1446
1447 int __init veth_module_init(void)
1448 {
1449         int i;
1450         int rc;
1451
1452         this_lp = HvLpConfig_getLpIndex_outline();
1453
1454         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1455                 rc = veth_init_connection(i);
1456                 if (rc != 0) {
1457                         veth_module_cleanup();
1458                         return rc;
1459                 }
1460         }
1461
1462         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1463                                   &veth_handle_event);
1464
1465         return vio_register_driver(&veth_driver);
1466 }
1467 module_init(veth_module_init);