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   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         cnx->state |= VETH_STATE_RESET;
 328         veth_kick_statemachine(cnx);
 329         spin_unlock_irqrestore(&cnx->lock, flags);
 330 }
 331
 332 static void veth_handle_ack(struct VethLpEvent *event)
 333 {
 334         HvLpIndex rlp = event->base_event.xTargetLp;
 335         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 336
 337         BUG_ON(! cnx);
 338
 339         switch (event->base_event.xSubtype) {
 340         case VethEventTypeCap:
 341                 veth_take_cap_ack(cnx, event);
 342                 break;
 343         case VethEventTypeMonitor:
 344                 veth_take_monitor_ack(cnx, event);
 345                 break;
 346         default:
 347                 veth_error("Unknown ack type %d from LPAR %d.\n",
 348                                 event->base_event.xSubtype, rlp);
 349         };
 350 }
 351
 352 static void veth_handle_int(struct VethLpEvent *event)
 353 {
 354         HvLpIndex rlp = event->base_event.xSourceLp;
 355         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 356         unsigned long flags;
 357         int i;
 358
 359         BUG_ON(! cnx);
 360
 361         switch (event->base_event.xSubtype) {
 362         case VethEventTypeCap:
 363                 veth_take_cap(cnx, event);
 364                 break;
 365         case VethEventTypeMonitor:
 366                 /* do nothing... this'll hang out here til we're dead,
 367                  * and the hypervisor will return it for us. */
 368                 break;
 369         case VethEventTypeFramesAck:
 370                 spin_lock_irqsave(&cnx->lock, flags);
 371                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
 372                         u16 msgnum = event->u.frames_ack_data.token[i];
 373
 374                         if (msgnum < VETH_NUMBUFFERS)
 375                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
 376                 }
 377                 spin_unlock_irqrestore(&cnx->lock, flags);
 378                 veth_flush_pending(cnx);
 379                 break;
 380         case VethEventTypeFrames:
 381                 veth_receive(cnx, event);
 382                 break;
 383         default:
 384                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
 385                                 event->base_event.xSubtype, rlp);
 386         };
 387 }
 388
 389 static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
 390 {
 391         struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
 392
 393         if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
 394                 veth_handle_ack(veth_event);
 395         else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
 396                 veth_handle_int(veth_event);
 397 }
 398
 399 static int veth_process_caps(struct veth_lpar_connection *cnx)
 400 {
 401         struct VethCapData *remote_caps = &cnx->remote_caps;
 402         int num_acks_needed;
 403
 404         /* Convert timer to jiffies */
 405         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
 406
 407         if ( (remote_caps->num_buffers == 0)
 408              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
 409              || (remote_caps->ack_threshold == 0)
 410              || (cnx->ack_timeout == 0) ) {
 411                 veth_error("Received incompatible capabilities from LPAR %d.\n",
 412                                 cnx->remote_lp);
 413                 return HvLpEvent_Rc_InvalidSubtypeData;
 414         }
 415
 416         num_acks_needed = (remote_caps->num_buffers
 417                            / remote_caps->ack_threshold) + 1;
 418
 419         /* FIXME: locking on num_ack_events? */
 420         if (cnx->num_ack_events < num_acks_needed) {
 421                 int num;
 422
 423                 num = veth_allocate_events(cnx->remote_lp,
 424                                            num_acks_needed-cnx->num_ack_events);
 425                 if (num > 0)
 426                         cnx->num_ack_events += num;
 427
 428                 if (cnx->num_ack_events < num_acks_needed) {
 429                         veth_error("Couldn't allocate enough ack events "
 430                                         "for LPAR %d.\n", cnx->remote_lp);
 431
 432                         return HvLpEvent_Rc_BufferNotAvailable;
 433                 }
 434         }
 435
 436
 437         return HvLpEvent_Rc_Good;
 438 }
 439
 440 /* FIXME: The gotos here are a bit dubious */
 441 static void veth_statemachine(void *p)
 442 {
 443         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
 444         int rlp = cnx->remote_lp;
 445         int rc;
 446
 447         spin_lock_irq(&cnx->lock);
 448
 449  restart:
 450         if (cnx->state & VETH_STATE_RESET) {
 451                 int i;
 452
 453                 del_timer(&cnx->ack_timer);
 454
 455                 if (cnx->state & VETH_STATE_OPEN)
 456                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
 457                                                      HvLpEvent_Type_VirtualLan);
 458
 459                 /* reset ack data */
 460                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 461                 cnx->num_pending_acks = 0;
 462
 463                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
 464                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
 465                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
 466                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
 467
 468                 /* Clean up any leftover messages */
 469                 if (cnx->msgs)
 470                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
 471                                 veth_recycle_msg(cnx, cnx->msgs + i);
 472                 spin_unlock_irq(&cnx->lock);
 473                 veth_flush_pending(cnx);
 474                 spin_lock_irq(&cnx->lock);
 475                 if (cnx->state & VETH_STATE_RESET)
 476                         goto restart;
 477         }
 478
 479         if (cnx->state & VETH_STATE_SHUTDOWN)
 480                 /* It's all over, do nothing */
 481                 goto out;
 482
 483         if ( !(cnx->state & VETH_STATE_OPEN) ) {
 484                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
 485                         goto cant_cope;
 486
 487                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
 488                 cnx->src_inst =
 489                         HvCallEvent_getSourceLpInstanceId(rlp,
 490                                                           HvLpEvent_Type_VirtualLan);
 491                 cnx->dst_inst =
 492                         HvCallEvent_getTargetLpInstanceId(rlp,
 493                                                           HvLpEvent_Type_VirtualLan);
 494                 cnx->state |= VETH_STATE_OPEN;
 495         }
 496
 497         if ( (cnx->state & VETH_STATE_OPEN)
 498              && !(cnx->state & VETH_STATE_SENTMON) ) {
 499                 rc = veth_signalevent(cnx, VethEventTypeMonitor,
 500                                       HvLpEvent_AckInd_DoAck,
 501                                       HvLpEvent_AckType_DeferredAck,
 502                                       0, 0, 0, 0, 0, 0);
 503
 504                 if (rc == HvLpEvent_Rc_Good) {
 505                         cnx->state |= VETH_STATE_SENTMON;
 506                 } else {
 507                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 508                              && (rc != HvLpEvent_Rc_PathClosed) )
 509                                 veth_error("Error sending monitor to LPAR %d, "
 510                                                 "rc = %d\n", rlp, rc);
 511
 512                         /* Oh well, hope we get a cap from the other
 513                          * end and do better when that kicks us */
 514                         goto out;
 515                 }
 516         }
 517
 518         if ( (cnx->state & VETH_STATE_OPEN)
 519              && !(cnx->state & VETH_STATE_SENTCAPS)) {
 520                 u64 *rawcap = (u64 *)&cnx->local_caps;
 521
 522                 rc = veth_signalevent(cnx, VethEventTypeCap,
 523                                       HvLpEvent_AckInd_DoAck,
 524                                       HvLpEvent_AckType_ImmediateAck,
 525                                       0, rawcap[0], rawcap[1], rawcap[2],
 526                                       rawcap[3], rawcap[4]);
 527
 528                 if (rc == HvLpEvent_Rc_Good) {
 529                         cnx->state |= VETH_STATE_SENTCAPS;
 530                 } else {
 531                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 532                              && (rc != HvLpEvent_Rc_PathClosed) )
 533                                 veth_error("Error sending caps to LPAR %d, "
 534                                                 "rc = %d\n", rlp, rc);
 535
 536                         /* Oh well, hope we get a cap from the other
 537                          * end and do better when that kicks us */
 538                         goto out;
 539                 }
 540         }
 541
 542         if ((cnx->state & VETH_STATE_GOTCAPS)
 543             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
 544                 struct VethCapData *remote_caps = &cnx->remote_caps;
 545
 546                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
 547                        sizeof(*remote_caps));
 548
 549                 spin_unlock_irq(&cnx->lock);
 550                 rc = veth_process_caps(cnx);
 551                 spin_lock_irq(&cnx->lock);
 552
 553                 /* We dropped the lock, so recheck for anything which
 554                  * might mess us up */
 555                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
 556                         goto restart;
 557
 558                 cnx->cap_event.base_event.xRc = rc;
 559                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
 560                 if (rc == HvLpEvent_Rc_Good)
 561                         cnx->state |= VETH_STATE_SENTCAPACK;
 562                 else
 563                         goto cant_cope;
 564         }
 565
 566         if ((cnx->state & VETH_STATE_GOTCAPACK)
 567             && (cnx->state & VETH_STATE_GOTCAPS)
 568             && !(cnx->state & VETH_STATE_READY)) {
 569                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
 570                         /* Start the ACK timer */
 571                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
 572                         add_timer(&cnx->ack_timer);
 573                         cnx->state |= VETH_STATE_READY;
 574                 } else {
 575                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
 576                                         rlp, cnx->cap_ack_event.base_event.xRc);
 577                         goto cant_cope;
 578                 }
 579         }
 580
 581  out:
 582         spin_unlock_irq(&cnx->lock);
 583         return;
 584
 585  cant_cope:
 586         /* FIXME: we get here if something happens we really can't
 587          * cope with.  The link will never work once we get here, and
 588          * all we can do is not lock the rest of the system up */
 589         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
 590                         " (state = 0x%04lx)\n", rlp, cnx->state);
 591         cnx->state |= VETH_STATE_SHUTDOWN;
 592         spin_unlock_irq(&cnx->lock);
 593 }
 594
 595 static int veth_init_connection(u8 rlp)
 596 {
 597         struct veth_lpar_connection *cnx;
 598         struct veth_msg *msgs;
 599         int i;
 600
 601         if ( (rlp == this_lp)
 602              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
 603                 return 0;
 604
 605         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
 606         if (! cnx)
 607                 return -ENOMEM;
 608         memset(cnx, 0, sizeof(*cnx));
 609
 610         cnx->remote_lp = rlp;
 611         spin_lock_init(&cnx->lock);
 612         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
 613         init_timer(&cnx->ack_timer);
 614         cnx->ack_timer.function = veth_timed_ack;
 615         cnx->ack_timer.data = (unsigned long) cnx;
 616         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 617
 618         veth_cnx[rlp] = cnx;
 619
 620         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
 621         if (! msgs) {
 622                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
 623                 return -ENOMEM;
 624         }
 625
 626         cnx->msgs = msgs;
 627         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
 628         spin_lock_init(&cnx->msg_stack_lock);
 629
 630         for (i = 0; i < VETH_NUMBUFFERS; i++) {
 631                 msgs[i].token = i;
 632                 veth_stack_push(cnx, msgs + i);
 633         }
 634
 635         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
 636
 637         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
 638                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
 639                 return -ENOMEM;
 640         }
 641
 642         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
 643         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
 644         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
 645
 646         return 0;
 647 }
 648
 649 static void veth_stop_connection(u8 rlp)
 650 {
 651         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 652
 653         if (! cnx)
 654                 return;
 655
 656         spin_lock_irq(&cnx->lock);
 657         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
 658         veth_kick_statemachine(cnx);
 659         spin_unlock_irq(&cnx->lock);
 660
 661         flush_scheduled_work();
 662
 663         /* FIXME: not sure if this is necessary - will already have
 664          * been deleted by the state machine, just want to make sure
 665          * its not running any more */
 666         del_timer_sync(&cnx->ack_timer);
 667
 668         if (cnx->num_events > 0)
 669                 mf_deallocate_lp_events(cnx->remote_lp,
 670                                       HvLpEvent_Type_VirtualLan,
 671                                       cnx->num_events,
 672                                       NULL, NULL);
 673         if (cnx->num_ack_events > 0)
 674                 mf_deallocate_lp_events(cnx->remote_lp,
 675                                       HvLpEvent_Type_VirtualLan,
 676                                       cnx->num_ack_events,
 677                                       NULL, NULL);
 678 }
 679
 680 static void veth_destroy_connection(u8 rlp)
 681 {
 682         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 683
 684         if (! cnx)
 685                 return;
 686
 687         kfree(cnx->msgs);
 688         kfree(cnx);
 689         veth_cnx[rlp] = NULL;
 690 }
 691
 692 /*
 693  * net_device code
 694  */
 695
 696 static int veth_open(struct net_device *dev)
 697 {
 698         struct veth_port *port = (struct veth_port *) dev->priv;
 699
 700         memset(&port->stats, 0, sizeof (port->stats));
 701         netif_start_queue(dev);
 702         return 0;
 703 }
 704
 705 static int veth_close(struct net_device *dev)
 706 {
 707         netif_stop_queue(dev);
 708         return 0;
 709 }
 710
 711 static struct net_device_stats *veth_get_stats(struct net_device *dev)
 712 {
 713         struct veth_port *port = (struct veth_port *) dev->priv;
 714
 715         return &port->stats;
 716 }
 717
 718 static int veth_change_mtu(struct net_device *dev, int new_mtu)
 719 {
 720         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
 721                 return -EINVAL;
 722         dev->mtu = new_mtu;
 723         return 0;
 724 }
 725
 726 static void veth_set_multicast_list(struct net_device *dev)
 727 {
 728         struct veth_port *port = (struct veth_port *) dev->priv;
 729         unsigned long flags;
 730
 731         write_lock_irqsave(&port->mcast_gate, flags);
 732
 733         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 734                 printk(KERN_INFO "%s: Promiscuous mode enabled.\n",
 735                        dev->name);
 736                 port->promiscuous = 1;
 737         } else if ( (dev->flags & IFF_ALLMULTI)
 738                     || (dev->mc_count > VETH_MAX_MCAST) ) {
 739                 port->all_mcast = 1;
 740         } else {
 741                 struct dev_mc_list *dmi = dev->mc_list;
 742                 int i;
 743
 744                 /* Update table */
 745                 port->num_mcast = 0;
 746
 747                 for (i = 0; i < dev->mc_count; i++) {
 748                         u8 *addr = dmi->dmi_addr;
 749                         u64 xaddr = 0;
 750
 751                         if (addr[0] & 0x01) {/* multicast address? */
 752                                 memcpy(&xaddr, addr, ETH_ALEN);
 753                                 port->mcast_addr[port->num_mcast] = xaddr;
 754                                 port->num_mcast++;
 755                         }
 756                         dmi = dmi->next;
 757                 }
 758         }
 759
 760         write_unlock_irqrestore(&port->mcast_gate, flags);
 761 }
 762
 763 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 764 {
 765         strncpy(info->driver, "veth", sizeof(info->driver) - 1);
 766         info->driver[sizeof(info->driver) - 1] = '\0';
 767         strncpy(info->version, "1.0", sizeof(info->version) - 1);
 768 }
 769
 770 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 771 {
 772         ecmd->supported = (SUPPORTED_1000baseT_Full
 773                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 774         ecmd->advertising = (SUPPORTED_1000baseT_Full
 775                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 776         ecmd->port = PORT_FIBRE;
 777         ecmd->transceiver = XCVR_INTERNAL;
 778         ecmd->phy_address = 0;
 779         ecmd->speed = SPEED_1000;
 780         ecmd->duplex = DUPLEX_FULL;
 781         ecmd->autoneg = AUTONEG_ENABLE;
 782         ecmd->maxtxpkt = 120;
 783         ecmd->maxrxpkt = 120;
 784         return 0;
 785 }
 786
 787 static u32 veth_get_link(struct net_device *dev)
 788 {
 789         return 1;
 790 }
 791
 792 static struct ethtool_ops ops = {
 793         .get_drvinfo = veth_get_drvinfo,
 794         .get_settings = veth_get_settings,
 795         .get_link = veth_get_link,
 796 };
 797
 798 static void veth_tx_timeout(struct net_device *dev)
 799 {
 800         struct veth_port *port = (struct veth_port *)dev->priv;
 801         struct net_device_stats *stats = &port->stats;
 802         unsigned long flags;
 803         int i;
 804
 805         stats->tx_errors++;
 806
 807         spin_lock_irqsave(&port->pending_gate, flags);
 808
 809         if (!port->pending_lpmask) {
 810                 spin_unlock_irqrestore(&port->pending_gate, flags);
 811                 return;
 812         }
 813
 814         printk(KERN_WARNING "%s: Tx timeout!  Resetting lp connections: %08x\n",
 815                dev->name, port->pending_lpmask);
 816
 817         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
 818                 struct veth_lpar_connection *cnx = veth_cnx[i];
 819
 820                 if (! (port->pending_lpmask & (1<<i)))
 821                         continue;
 822
 823                 /* If we're pending on it, we must be connected to it,
 824                  * so we should certainly have a structure for it. */
 825                 BUG_ON(! cnx);
 826
 827                 /* Theoretically we could be kicking a connection
 828                  * which doesn't deserve it, but in practice if we've
 829                  * had a Tx timeout, the pending_lpmask will have
 830                  * exactly one bit set - the connection causing the
 831                  * problem. */
 832                 spin_lock(&cnx->lock);
 833                 cnx->state |= VETH_STATE_RESET;
 834                 veth_kick_statemachine(cnx);
 835                 spin_unlock(&cnx->lock);
 836         }
 837
 838         spin_unlock_irqrestore(&port->pending_gate, flags);
 839 }
 840
 841 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
 842 {
 843         struct net_device *dev;
 844         struct veth_port *port;
 845         int i, rc;
 846
 847         dev = alloc_etherdev(sizeof (struct veth_port));
 848         if (! dev) {
 849                 veth_error("Unable to allocate net_device structure!\n");
 850                 return NULL;
 851         }
 852
 853         port = (struct veth_port *) dev->priv;
 854
 855         spin_lock_init(&port->pending_gate);
 856         rwlock_init(&port->mcast_gate);
 857
 858         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
 859                 HvLpVirtualLanIndexMap map;
 860
 861                 if (i == this_lp)
 862                         continue;
 863                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
 864                 if (map & (0x8000 >> vlan))
 865                         port->lpar_map |= (1 << i);
 866         }
 867         port->dev = vdev;
 868
 869         dev->dev_addr[0] = 0x02;
 870         dev->dev_addr[1] = 0x01;
 871         dev->dev_addr[2] = 0xff;
 872         dev->dev_addr[3] = vlan;
 873         dev->dev_addr[4] = 0xff;
 874         dev->dev_addr[5] = this_lp;
 875
 876         dev->mtu = VETH_MAX_MTU;
 877
 878         memcpy(&port->mac_addr, dev->dev_addr, 6);
 879
 880         dev->open = veth_open;
 881         dev->hard_start_xmit = veth_start_xmit;
 882         dev->stop = veth_close;
 883         dev->get_stats = veth_get_stats;
 884         dev->change_mtu = veth_change_mtu;
 885         dev->set_mac_address = NULL;
 886         dev->set_multicast_list = veth_set_multicast_list;
 887         SET_ETHTOOL_OPS(dev, &ops);
 888
 889         dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000);
 890         dev->tx_timeout = veth_tx_timeout;
 891
 892         SET_NETDEV_DEV(dev, vdev);
 893
 894         rc = register_netdev(dev);
 895         if (rc != 0) {
 896                 veth_error("Failed registering net device for vlan%d.\n", vlan);
 897                 free_netdev(dev);
 898                 return NULL;
 899         }
 900
 901         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
 902                         dev->name, vlan, port->lpar_map);
 903
 904         return dev;
 905 }
 906
 907 /*
 908  * Tx path
 909  */
 910
 911 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
 912                                 struct net_device *dev)
 913 {
 914         struct veth_lpar_connection *cnx = veth_cnx[rlp];
 915         struct veth_port *port = (struct veth_port *) dev->priv;
 916         HvLpEvent_Rc rc;
 917         u32 dma_address, dma_length;
 918         struct veth_msg *msg = NULL;
 919         int err = 0;
 920         unsigned long flags;
 921
 922         if (! cnx) {
 923                 port->stats.tx_errors++;
 924                 dev_kfree_skb(skb);
 925                 return 0;
 926         }
 927
 928         spin_lock_irqsave(&cnx->lock, flags);
 929
 930         if (! (cnx->state & VETH_STATE_READY))
 931                 goto drop;
 932
 933         if ((skb->len - 14) > VETH_MAX_MTU)
 934                 goto drop;
 935
 936         msg = veth_stack_pop(cnx);
 937
 938         if (! msg) {
 939                 err = 1;
 940                 goto drop;
 941         }
 942
 943         dma_length = skb->len;
 944         dma_address = dma_map_single(port->dev, skb->data,
 945                                      dma_length, DMA_TO_DEVICE);
 946
 947         if (dma_mapping_error(dma_address))
 948                 goto recycle_and_drop;
 949
 950         /* Is it really necessary to check the length and address
 951          * fields of the first entry here? */
 952         msg->skb = skb;
 953         msg->dev = port->dev;
 954         msg->data.addr[0] = dma_address;
 955         msg->data.len[0] = dma_length;
 956         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
 957         set_bit(0, &(msg->in_use));
 958         rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
 959
 960         if (rc != HvLpEvent_Rc_Good)
 961                 goto recycle_and_drop;
 962
 963         spin_unlock_irqrestore(&cnx->lock, flags);
 964         return 0;
 965
 966  recycle_and_drop:
 967         msg->skb = NULL;
 968         /* need to set in use to make veth_recycle_msg in case this
 969          * was a mapping failure */
 970         set_bit(0, &msg->in_use);
 971         veth_recycle_msg(cnx, msg);
 972  drop:
 973         port->stats.tx_errors++;
 974         dev_kfree_skb(skb);
 975         spin_unlock_irqrestore(&cnx->lock, flags);
 976         return err;
 977 }
 978
 979 static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
 980                                           HvLpIndexMap lpmask,
 981                                           struct net_device *dev)
 982 {
 983         struct veth_port *port = (struct veth_port *) dev->priv;
 984         int i;
 985         int rc;
 986
 987         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
 988                 if ((lpmask & (1 << i)) == 0)
 989                         continue;
 990
 991                 rc = veth_transmit_to_one(skb_get(skb), i, dev);
 992                 if (! rc)
 993                         lpmask &= ~(1<<i);
 994         }
 995
 996         if (! lpmask) {
 997                 port->stats.tx_packets++;
 998                 port->stats.tx_bytes += skb->len;
 999         }
1000
1001         return lpmask;
1002 }
1003
1004 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1005 {
1006         unsigned char *frame = skb->data;
1007         struct veth_port *port = (struct veth_port *) dev->priv;
1008         unsigned long flags;
1009         HvLpIndexMap lpmask;
1010
1011         if (! (frame[0] & 0x01)) {
1012                 /* unicast packet */
1013                 HvLpIndex rlp = frame[5];
1014
1015                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1016                         dev_kfree_skb(skb);
1017                         return 0;
1018                 }
1019
1020                 lpmask = 1 << rlp;
1021         } else {
1022                 lpmask = port->lpar_map;
1023         }
1024
1025         spin_lock_irqsave(&port->pending_gate, flags);
1026
1027         lpmask = veth_transmit_to_many(skb, lpmask, dev);
1028
1029         dev->trans_start = jiffies;
1030
1031         if (! lpmask) {
1032                 dev_kfree_skb(skb);
1033         } else {
1034                 if (port->pending_skb) {
1035                         veth_error("%s: TX while skb was pending!\n",
1036                                    dev->name);
1037                         dev_kfree_skb(skb);
1038                         spin_unlock_irqrestore(&port->pending_gate, flags);
1039                         return 1;
1040                 }
1041
1042                 port->pending_skb = skb;
1043                 port->pending_lpmask = lpmask;
1044                 netif_stop_queue(dev);
1045         }
1046
1047         spin_unlock_irqrestore(&port->pending_gate, flags);
1048
1049         return 0;
1050 }
1051
1052 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1053                              struct veth_msg *msg)
1054 {
1055         u32 dma_address, dma_length;
1056
1057         if (test_and_clear_bit(0, &msg->in_use)) {
1058                 dma_address = msg->data.addr[0];
1059                 dma_length = msg->data.len[0];
1060
1061                 dma_unmap_single(msg->dev, dma_address, dma_length,
1062                                  DMA_TO_DEVICE);
1063
1064                 if (msg->skb) {
1065                         dev_kfree_skb_any(msg->skb);
1066                         msg->skb = NULL;
1067                 }
1068
1069                 memset(&msg->data, 0, sizeof(msg->data));
1070                 veth_stack_push(cnx, msg);
1071         } else if (cnx->state & VETH_STATE_OPEN) {
1072                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1073                                 cnx->remote_lp, msg->token);
1074         }
1075 }
1076
1077 static void veth_flush_pending(struct veth_lpar_connection *cnx)
1078 {
1079         int i;
1080         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1081                 struct net_device *dev = veth_dev[i];
1082                 struct veth_port *port;
1083                 unsigned long flags;
1084
1085                 if (! dev)
1086                         continue;
1087
1088                 port = (struct veth_port *)dev->priv;
1089
1090                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1091                         continue;
1092
1093                 spin_lock_irqsave(&port->pending_gate, flags);
1094                 if (port->pending_skb) {
1095                         port->pending_lpmask =
1096                                 veth_transmit_to_many(port->pending_skb,
1097                                                       port->pending_lpmask,
1098                                                       dev);
1099                         if (! port->pending_lpmask) {
1100                                 dev_kfree_skb_any(port->pending_skb);
1101                                 port->pending_skb = NULL;
1102                                 netif_wake_queue(dev);
1103                         }
1104                 }
1105                 spin_unlock_irqrestore(&port->pending_gate, flags);
1106         }
1107 }
1108
1109 /*
1110  * Rx path
1111  */
1112
1113 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1114 {
1115         int wanted = 0;
1116         int i;
1117         unsigned long flags;
1118
1119         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1120                 return 1;
1121
1122         if (! (((char *) &mac_addr)[0] & 0x01))
1123                 return 0;
1124
1125         read_lock_irqsave(&port->mcast_gate, flags);
1126
1127         if (port->promiscuous || port->all_mcast) {
1128                 wanted = 1;
1129                 goto out;
1130         }
1131
1132         for (i = 0; i < port->num_mcast; ++i) {
1133                 if (port->mcast_addr[i] == mac_addr) {
1134                         wanted = 1;
1135                         break;
1136                 }
1137         }
1138
1139  out:
1140         read_unlock_irqrestore(&port->mcast_gate, flags);
1141
1142         return wanted;
1143 }
1144
1145 struct dma_chunk {
1146         u64 addr;
1147         u64 size;
1148 };
1149
1150 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1151
1152 static inline void veth_build_dma_list(struct dma_chunk *list,
1153                                        unsigned char *p, unsigned long length)
1154 {
1155         unsigned long done;
1156         int i = 1;
1157
1158         /* FIXME: skbs are continguous in real addresses.  Do we
1159          * really need to break it into PAGE_SIZE chunks, or can we do
1160          * it just at the granularity of iSeries real->absolute
1161          * mapping?  Indeed, given the way the allocator works, can we
1162          * count on them being absolutely contiguous? */
1163         list[0].addr = ISERIES_HV_ADDR(p);
1164         list[0].size = min(length,
1165                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1166
1167         done = list[0].size;
1168         while (done < length) {
1169                 list[i].addr = ISERIES_HV_ADDR(p + done);
1170                 list[i].size = min(length-done, PAGE_SIZE);
1171                 done += list[i].size;
1172                 i++;
1173         }
1174 }
1175
1176 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1177 {
1178         HvLpEvent_Rc rc;
1179
1180         rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1181                              0, &cnx->pending_acks);
1182
1183         if (rc != HvLpEvent_Rc_Good)
1184                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1185                                 cnx->remote_lp, (int)rc);
1186
1187         cnx->num_pending_acks = 0;
1188         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1189 }
1190
1191 static void veth_receive(struct veth_lpar_connection *cnx,
1192                          struct VethLpEvent *event)
1193 {
1194         struct VethFramesData *senddata = &event->u.frames_data;
1195         int startchunk = 0;
1196         int nchunks;
1197         unsigned long flags;
1198         HvLpDma_Rc rc;
1199
1200         do {
1201                 u16 length = 0;
1202                 struct sk_buff *skb;
1203                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1204                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1205                 u64 dest;
1206                 HvLpVirtualLanIndex vlan;
1207                 struct net_device *dev;
1208                 struct veth_port *port;
1209
1210                 /* FIXME: do we need this? */
1211                 memset(local_list, 0, sizeof(local_list));
1212                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1213
1214                 /* a 0 address marks the end of the valid entries */
1215                 if (senddata->addr[startchunk] == 0)
1216                         break;
1217
1218                 /* make sure that we have at least 1 EOF entry in the
1219                  * remaining entries */
1220                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1221                         veth_error("Missing EOF fragment in event "
1222                                         "eofmask = 0x%x startchunk = %d\n",
1223                                         (unsigned)senddata->eofmask,
1224                                         startchunk);
1225                         break;
1226                 }
1227
1228                 /* build list of chunks in this frame */
1229                 nchunks = 0;
1230                 do {
1231                         remote_list[nchunks].addr =
1232                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1233                         remote_list[nchunks].size =
1234                                 senddata->len[startchunk+nchunks];
1235                         length += remote_list[nchunks].size;
1236                 } while (! (senddata->eofmask &
1237                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1238
1239                 /* length == total length of all chunks */
1240                 /* nchunks == # of chunks in this frame */
1241
1242                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1243                         veth_error("Received oversize frame from LPAR %d "
1244                                         "(length = %d)\n",
1245                                         cnx->remote_lp, length);
1246                         continue;
1247                 }
1248
1249                 skb = alloc_skb(length, GFP_ATOMIC);
1250                 if (!skb)
1251                         continue;
1252
1253                 veth_build_dma_list(local_list, skb->data, length);
1254
1255                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1256                                             event->base_event.xSourceLp,
1257                                             HvLpDma_Direction_RemoteToLocal,
1258                                             cnx->src_inst,
1259                                             cnx->dst_inst,
1260                                             HvLpDma_AddressType_RealAddress,
1261                                             HvLpDma_AddressType_TceIndex,
1262                                             ISERIES_HV_ADDR(&local_list),
1263                                             ISERIES_HV_ADDR(&remote_list),
1264                                             length);
1265                 if (rc != HvLpDma_Rc_Good) {
1266                         dev_kfree_skb_irq(skb);
1267                         continue;
1268                 }
1269
1270                 vlan = skb->data[9];
1271                 dev = veth_dev[vlan];
1272                 if (! dev) {
1273                         /*
1274                          * Some earlier versions of the driver sent
1275                          * broadcasts down all connections, even to lpars
1276                          * that weren't on the relevant vlan. So ignore
1277                          * packets belonging to a vlan we're not on.
1278                          * We can also be here if we receive packets while
1279                          * the driver is going down, because then dev is NULL.
1280                          */
1281                         dev_kfree_skb_irq(skb);
1282                         continue;
1283                 }
1284
1285                 port = (struct veth_port *)dev->priv;
1286                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1287
1288                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1289                         dev_kfree_skb_irq(skb);
1290                         continue;
1291                 }
1292                 if (! veth_frame_wanted(port, dest)) {
1293                         dev_kfree_skb_irq(skb);
1294                         continue;
1295                 }
1296
1297                 skb_put(skb, length);
1298                 skb->dev = dev;
1299                 skb->protocol = eth_type_trans(skb, dev);
1300                 skb->ip_summed = CHECKSUM_NONE;
1301                 netif_rx(skb);  /* send it up */
1302                 port->stats.rx_packets++;
1303                 port->stats.rx_bytes += length;
1304         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1305
1306         /* Ack it */
1307         spin_lock_irqsave(&cnx->lock, flags);
1308         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1309
1310         cnx->pending_acks[cnx->num_pending_acks++] =
1311                 event->base_event.xCorrelationToken;
1312
1313         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1314              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1315                 veth_flush_acks(cnx);
1316
1317         spin_unlock_irqrestore(&cnx->lock, flags);
1318 }
1319
1320 static void veth_timed_ack(unsigned long ptr)
1321 {
1322         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1323         unsigned long flags;
1324
1325         /* Ack all the events */
1326         spin_lock_irqsave(&cnx->lock, flags);
1327         if (cnx->num_pending_acks > 0)
1328                 veth_flush_acks(cnx);
1329
1330         /* Reschedule the timer */
1331         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1332         add_timer(&cnx->ack_timer);
1333         spin_unlock_irqrestore(&cnx->lock, flags);
1334 }
1335
1336 static int veth_remove(struct vio_dev *vdev)
1337 {
1338         int i = vdev->unit_address;
1339         struct net_device *dev;
1340
1341         dev = veth_dev[i];
1342         if (dev != NULL) {
1343                 veth_dev[i] = NULL;
1344                 unregister_netdev(dev);
1345                 free_netdev(dev);
1346         }
1347         return 0;
1348 }
1349
1350 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1351 {
1352         int i = vdev->unit_address;
1353         struct net_device *dev;
1354
1355         dev = veth_probe_one(i, &vdev->dev);
1356         if (dev == NULL) {
1357                 veth_remove(vdev);
1358                 return 1;
1359         }
1360         veth_dev[i] = dev;
1361
1362         /* Start the state machine on each connection, to commence
1363          * link negotiation */
1364         for (i = 0; i < HVMAXARCHITECTEDLPS; i++)
1365                 if (veth_cnx[i])
1366                         veth_kick_statemachine(veth_cnx[i]);
1367
1368         return 0;
1369 }
1370
1371 /**
1372  * veth_device_table: Used by vio.c to match devices that we
1373  * support.
1374  */
1375 static struct vio_device_id veth_device_table[] __devinitdata = {
1376         { "vlan", "" },
1377         { "", "" }
1378 };
1379 MODULE_DEVICE_TABLE(vio, veth_device_table);
1380
1381 static struct vio_driver veth_driver = {
1382         .name = "iseries_veth",
1383         .id_table = veth_device_table,
1384         .probe = veth_probe,
1385         .remove = veth_remove
1386 };
1387
1388 /*
1389  * Module initialization/cleanup
1390  */
1391
1392 void __exit veth_module_cleanup(void)
1393 {
1394         int i;
1395
1396         /* Stop the queues first to stop any new packets being sent. */
1397         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++)
1398                 if (veth_dev[i])
1399                         netif_stop_queue(veth_dev[i]);
1400
1401         /* Stop the connections before we unregister the driver. This
1402          * ensures there's no skbs lying around holding the device open. */
1403         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1404                 veth_stop_connection(i);
1405
1406         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1407
1408         /* Hypervisor callbacks may have scheduled more work while we
1409          * were stoping connections. Now that we've disconnected from
1410          * the hypervisor make sure everything's finished. */
1411         flush_scheduled_work();
1412
1413         vio_unregister_driver(&veth_driver);
1414
1415         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1416                 veth_destroy_connection(i);
1417
1418 }
1419 module_exit(veth_module_cleanup);
1420
1421 int __init veth_module_init(void)
1422 {
1423         int i;
1424         int rc;
1425
1426         this_lp = HvLpConfig_getLpIndex_outline();
1427
1428         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1429                 rc = veth_init_connection(i);
1430                 if (rc != 0) {
1431                         veth_module_cleanup();
1432                         return rc;
1433                 }
1434         }
1435
1436         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1437                                   &veth_handle_event);
1438
1439         return vio_register_driver(&veth_driver);
1440 }
1441 module_init(veth_module_init);