[PATCH] iseries_veth: Simplify full-queue handling
[linux-2.6.git] / 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         int 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 kobject kobject;
133         struct timer_list ack_timer;
134
135         struct timer_list reset_timer;
136         unsigned int reset_timeout;
137         unsigned long last_contact;
138         int outstanding_tx;
139
140         spinlock_t lock;
141         unsigned long state;
142         HvLpInstanceId src_inst;
143         HvLpInstanceId dst_inst;
144         struct VethLpEvent cap_event, cap_ack_event;
145         u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
146         u32 num_pending_acks;
147
148         int num_ack_events;
149         struct VethCapData remote_caps;
150         u32 ack_timeout;
151
152         struct veth_msg *msg_stack_head;
153 };
154
155 struct veth_port {
156         struct device *dev;
157         struct net_device_stats stats;
158         u64 mac_addr;
159         HvLpIndexMap lpar_map;
160
161         /* queue_lock protects the stopped_map and dev's queue. */
162         spinlock_t queue_lock;
163         HvLpIndexMap stopped_map;
164
165         /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
166         rwlock_t mcast_gate;
167         int promiscuous;
168         int num_mcast;
169         u64 mcast_addr[VETH_MAX_MCAST];
170 };
171
172 static HvLpIndex this_lp;
173 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
174 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
175
176 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
177 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
178 static void veth_wake_queues(struct veth_lpar_connection *cnx);
179 static void veth_stop_queues(struct veth_lpar_connection *cnx);
180 static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
181 static void veth_release_connection(struct kobject *kobject);
182 static void veth_timed_ack(unsigned long ptr);
183 static void veth_timed_reset(unsigned long ptr);
184
185 static struct kobj_type veth_lpar_connection_ktype = {
186         .release        = veth_release_connection
187 };
188
189 /*
190  * Utility functions
191  */
192
193 #define veth_info(fmt, args...) \
194         printk(KERN_INFO "iseries_veth: " fmt, ## args)
195
196 #define veth_error(fmt, args...) \
197         printk(KERN_ERR "iseries_veth: Error: " fmt, ## args)
198
199 #ifdef DEBUG
200 #define veth_debug(fmt, args...) \
201         printk(KERN_DEBUG "iseries_veth: " fmt, ## args)
202 #else
203 #define veth_debug(fmt, args...) do {} while (0)
204 #endif
205
206 /* You must hold the connection's lock when you call this function. */
207 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
208                                    struct veth_msg *msg)
209 {
210         msg->next = cnx->msg_stack_head;
211         cnx->msg_stack_head = msg;
212 }
213
214 /* You must hold the connection's lock when you call this function. */
215 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
216 {
217         struct veth_msg *msg;
218
219         msg = cnx->msg_stack_head;
220         if (msg)
221                 cnx->msg_stack_head = cnx->msg_stack_head->next;
222
223         return msg;
224 }
225
226 /* You must hold the connection's lock when you call this function. */
227 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
228 {
229         return cnx->msg_stack_head == NULL;
230 }
231
232 static inline HvLpEvent_Rc
233 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
234                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
235                  u64 token,
236                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
237 {
238         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
239                                              HvLpEvent_Type_VirtualLan,
240                                              subtype, ackind, acktype,
241                                              cnx->src_inst,
242                                              cnx->dst_inst,
243                                              token, data1, data2, data3,
244                                              data4, data5);
245 }
246
247 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
248                                            u16 subtype, u64 token, void *data)
249 {
250         u64 *p = (u64 *) data;
251
252         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
253                                 HvLpEvent_AckType_ImmediateAck,
254                                 token, p[0], p[1], p[2], p[3], p[4]);
255 }
256
257 struct veth_allocation {
258         struct completion c;
259         int num;
260 };
261
262 static void veth_complete_allocation(void *parm, int number)
263 {
264         struct veth_allocation *vc = (struct veth_allocation *)parm;
265
266         vc->num = number;
267         complete(&vc->c);
268 }
269
270 static int veth_allocate_events(HvLpIndex rlp, int number)
271 {
272         struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
273
274         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
275                             sizeof(struct VethLpEvent), number,
276                             &veth_complete_allocation, &vc);
277         wait_for_completion(&vc.c);
278
279         return vc.num;
280 }
281
282 /*
283  * LPAR connection code
284  */
285
286 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
287 {
288         schedule_work(&cnx->statemachine_wq);
289 }
290
291 static void veth_take_cap(struct veth_lpar_connection *cnx,
292                           struct VethLpEvent *event)
293 {
294         unsigned long flags;
295
296         spin_lock_irqsave(&cnx->lock, flags);
297         /* Receiving caps may mean the other end has just come up, so
298          * we need to reload the instance ID of the far end */
299         cnx->dst_inst =
300                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
301                                                   HvLpEvent_Type_VirtualLan);
302
303         if (cnx->state & VETH_STATE_GOTCAPS) {
304                 veth_error("Received a second capabilities from LPAR %d.\n",
305                            cnx->remote_lp);
306                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
307                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
308         } else {
309                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
310                 cnx->state |= VETH_STATE_GOTCAPS;
311                 veth_kick_statemachine(cnx);
312         }
313         spin_unlock_irqrestore(&cnx->lock, flags);
314 }
315
316 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
317                               struct VethLpEvent *event)
318 {
319         unsigned long flags;
320
321         spin_lock_irqsave(&cnx->lock, flags);
322         if (cnx->state & VETH_STATE_GOTCAPACK) {
323                 veth_error("Received a second capabilities ack from LPAR %d.\n",
324                            cnx->remote_lp);
325         } else {
326                 memcpy(&cnx->cap_ack_event, event,
327                        sizeof(&cnx->cap_ack_event));
328                 cnx->state |= VETH_STATE_GOTCAPACK;
329                 veth_kick_statemachine(cnx);
330         }
331         spin_unlock_irqrestore(&cnx->lock, flags);
332 }
333
334 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
335                                   struct VethLpEvent *event)
336 {
337         unsigned long flags;
338
339         spin_lock_irqsave(&cnx->lock, flags);
340         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
341
342         /* Avoid kicking the statemachine once we're shutdown.
343          * It's unnecessary and it could break veth_stop_connection(). */
344
345         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
346                 cnx->state |= VETH_STATE_RESET;
347                 veth_kick_statemachine(cnx);
348         }
349         spin_unlock_irqrestore(&cnx->lock, flags);
350 }
351
352 static void veth_handle_ack(struct VethLpEvent *event)
353 {
354         HvLpIndex rlp = event->base_event.xTargetLp;
355         struct veth_lpar_connection *cnx = veth_cnx[rlp];
356
357         BUG_ON(! cnx);
358
359         switch (event->base_event.xSubtype) {
360         case VethEventTypeCap:
361                 veth_take_cap_ack(cnx, event);
362                 break;
363         case VethEventTypeMonitor:
364                 veth_take_monitor_ack(cnx, event);
365                 break;
366         default:
367                 veth_error("Unknown ack type %d from LPAR %d.\n",
368                                 event->base_event.xSubtype, rlp);
369         };
370 }
371
372 static void veth_handle_int(struct VethLpEvent *event)
373 {
374         HvLpIndex rlp = event->base_event.xSourceLp;
375         struct veth_lpar_connection *cnx = veth_cnx[rlp];
376         unsigned long flags;
377         int i, acked = 0;
378
379         BUG_ON(! cnx);
380
381         switch (event->base_event.xSubtype) {
382         case VethEventTypeCap:
383                 veth_take_cap(cnx, event);
384                 break;
385         case VethEventTypeMonitor:
386                 /* do nothing... this'll hang out here til we're dead,
387                  * and the hypervisor will return it for us. */
388                 break;
389         case VethEventTypeFramesAck:
390                 spin_lock_irqsave(&cnx->lock, flags);
391
392                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
393                         u16 msgnum = event->u.frames_ack_data.token[i];
394
395                         if (msgnum < VETH_NUMBUFFERS) {
396                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
397                                 cnx->outstanding_tx--;
398                                 acked++;
399                         }
400                 }
401
402                 if (acked > 0) {
403                         cnx->last_contact = jiffies;
404                         veth_wake_queues(cnx);
405                 }
406
407                 spin_unlock_irqrestore(&cnx->lock, flags);
408                 break;
409         case VethEventTypeFrames:
410                 veth_receive(cnx, event);
411                 break;
412         default:
413                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
414                                 event->base_event.xSubtype, rlp);
415         };
416 }
417
418 static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
419 {
420         struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
421
422         if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
423                 veth_handle_ack(veth_event);
424         else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
425                 veth_handle_int(veth_event);
426 }
427
428 static int veth_process_caps(struct veth_lpar_connection *cnx)
429 {
430         struct VethCapData *remote_caps = &cnx->remote_caps;
431         int num_acks_needed;
432
433         /* Convert timer to jiffies */
434         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
435
436         if ( (remote_caps->num_buffers == 0)
437              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
438              || (remote_caps->ack_threshold == 0)
439              || (cnx->ack_timeout == 0) ) {
440                 veth_error("Received incompatible capabilities from LPAR %d.\n",
441                                 cnx->remote_lp);
442                 return HvLpEvent_Rc_InvalidSubtypeData;
443         }
444
445         num_acks_needed = (remote_caps->num_buffers
446                            / remote_caps->ack_threshold) + 1;
447
448         /* FIXME: locking on num_ack_events? */
449         if (cnx->num_ack_events < num_acks_needed) {
450                 int num;
451
452                 num = veth_allocate_events(cnx->remote_lp,
453                                            num_acks_needed-cnx->num_ack_events);
454                 if (num > 0)
455                         cnx->num_ack_events += num;
456
457                 if (cnx->num_ack_events < num_acks_needed) {
458                         veth_error("Couldn't allocate enough ack events "
459                                         "for LPAR %d.\n", cnx->remote_lp);
460
461                         return HvLpEvent_Rc_BufferNotAvailable;
462                 }
463         }
464
465
466         return HvLpEvent_Rc_Good;
467 }
468
469 /* FIXME: The gotos here are a bit dubious */
470 static void veth_statemachine(void *p)
471 {
472         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
473         int rlp = cnx->remote_lp;
474         int rc;
475
476         spin_lock_irq(&cnx->lock);
477
478  restart:
479         if (cnx->state & VETH_STATE_RESET) {
480                 if (cnx->state & VETH_STATE_OPEN)
481                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
482                                                      HvLpEvent_Type_VirtualLan);
483
484                 /*
485                  * Reset ack data. This prevents the ack_timer actually
486                  * doing anything, even if it runs one more time when
487                  * we drop the lock below.
488                  */
489                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
490                 cnx->num_pending_acks = 0;
491
492                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
493                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
494                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
495                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
496
497                 /* Clean up any leftover messages */
498                 if (cnx->msgs) {
499                         int i;
500                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
501                                 veth_recycle_msg(cnx, cnx->msgs + i);
502                 }
503
504                 cnx->outstanding_tx = 0;
505                 veth_wake_queues(cnx);
506
507                 /* Drop the lock so we can do stuff that might sleep or
508                  * take other locks. */
509                 spin_unlock_irq(&cnx->lock);
510
511                 del_timer_sync(&cnx->ack_timer);
512                 del_timer_sync(&cnx->reset_timer);
513
514                 spin_lock_irq(&cnx->lock);
515
516                 if (cnx->state & VETH_STATE_RESET)
517                         goto restart;
518
519                 /* Hack, wait for the other end to reset itself. */
520                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
521                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
522                         goto out;
523                 }
524         }
525
526         if (cnx->state & VETH_STATE_SHUTDOWN)
527                 /* It's all over, do nothing */
528                 goto out;
529
530         if ( !(cnx->state & VETH_STATE_OPEN) ) {
531                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
532                         goto cant_cope;
533
534                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
535                 cnx->src_inst =
536                         HvCallEvent_getSourceLpInstanceId(rlp,
537                                                           HvLpEvent_Type_VirtualLan);
538                 cnx->dst_inst =
539                         HvCallEvent_getTargetLpInstanceId(rlp,
540                                                           HvLpEvent_Type_VirtualLan);
541                 cnx->state |= VETH_STATE_OPEN;
542         }
543
544         if ( (cnx->state & VETH_STATE_OPEN)
545              && !(cnx->state & VETH_STATE_SENTMON) ) {
546                 rc = veth_signalevent(cnx, VethEventTypeMonitor,
547                                       HvLpEvent_AckInd_DoAck,
548                                       HvLpEvent_AckType_DeferredAck,
549                                       0, 0, 0, 0, 0, 0);
550
551                 if (rc == HvLpEvent_Rc_Good) {
552                         cnx->state |= VETH_STATE_SENTMON;
553                 } else {
554                         if ( (rc != HvLpEvent_Rc_PartitionDead)
555                              && (rc != HvLpEvent_Rc_PathClosed) )
556                                 veth_error("Error sending monitor to LPAR %d, "
557                                                 "rc = %d\n", rlp, rc);
558
559                         /* Oh well, hope we get a cap from the other
560                          * end and do better when that kicks us */
561                         goto out;
562                 }
563         }
564
565         if ( (cnx->state & VETH_STATE_OPEN)
566              && !(cnx->state & VETH_STATE_SENTCAPS)) {
567                 u64 *rawcap = (u64 *)&cnx->local_caps;
568
569                 rc = veth_signalevent(cnx, VethEventTypeCap,
570                                       HvLpEvent_AckInd_DoAck,
571                                       HvLpEvent_AckType_ImmediateAck,
572                                       0, rawcap[0], rawcap[1], rawcap[2],
573                                       rawcap[3], rawcap[4]);
574
575                 if (rc == HvLpEvent_Rc_Good) {
576                         cnx->state |= VETH_STATE_SENTCAPS;
577                 } else {
578                         if ( (rc != HvLpEvent_Rc_PartitionDead)
579                              && (rc != HvLpEvent_Rc_PathClosed) )
580                                 veth_error("Error sending caps to LPAR %d, "
581                                                 "rc = %d\n", rlp, rc);
582
583                         /* Oh well, hope we get a cap from the other
584                          * end and do better when that kicks us */
585                         goto out;
586                 }
587         }
588
589         if ((cnx->state & VETH_STATE_GOTCAPS)
590             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
591                 struct VethCapData *remote_caps = &cnx->remote_caps;
592
593                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
594                        sizeof(*remote_caps));
595
596                 spin_unlock_irq(&cnx->lock);
597                 rc = veth_process_caps(cnx);
598                 spin_lock_irq(&cnx->lock);
599
600                 /* We dropped the lock, so recheck for anything which
601                  * might mess us up */
602                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
603                         goto restart;
604
605                 cnx->cap_event.base_event.xRc = rc;
606                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
607                 if (rc == HvLpEvent_Rc_Good)
608                         cnx->state |= VETH_STATE_SENTCAPACK;
609                 else
610                         goto cant_cope;
611         }
612
613         if ((cnx->state & VETH_STATE_GOTCAPACK)
614             && (cnx->state & VETH_STATE_GOTCAPS)
615             && !(cnx->state & VETH_STATE_READY)) {
616                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
617                         /* Start the ACK timer */
618                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
619                         add_timer(&cnx->ack_timer);
620                         cnx->state |= VETH_STATE_READY;
621                 } else {
622                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
623                                         rlp, cnx->cap_ack_event.base_event.xRc);
624                         goto cant_cope;
625                 }
626         }
627
628  out:
629         spin_unlock_irq(&cnx->lock);
630         return;
631
632  cant_cope:
633         /* FIXME: we get here if something happens we really can't
634          * cope with.  The link will never work once we get here, and
635          * all we can do is not lock the rest of the system up */
636         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
637                         " (state = 0x%04lx)\n", rlp, cnx->state);
638         cnx->state |= VETH_STATE_SHUTDOWN;
639         spin_unlock_irq(&cnx->lock);
640 }
641
642 static int veth_init_connection(u8 rlp)
643 {
644         struct veth_lpar_connection *cnx;
645         struct veth_msg *msgs;
646         int i, rc;
647
648         if ( (rlp == this_lp)
649              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
650                 return 0;
651
652         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
653         if (! cnx)
654                 return -ENOMEM;
655         memset(cnx, 0, sizeof(*cnx));
656
657         cnx->remote_lp = rlp;
658         spin_lock_init(&cnx->lock);
659         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
660
661         init_timer(&cnx->ack_timer);
662         cnx->ack_timer.function = veth_timed_ack;
663         cnx->ack_timer.data = (unsigned long) cnx;
664
665         init_timer(&cnx->reset_timer);
666         cnx->reset_timer.function = veth_timed_reset;
667         cnx->reset_timer.data = (unsigned long) cnx;
668         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
669
670         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
671
672         veth_cnx[rlp] = cnx;
673
674         /* This gets us 1 reference, which is held on behalf of the driver
675          * infrastructure. It's released at module unload. */
676         kobject_init(&cnx->kobject);
677         cnx->kobject.ktype = &veth_lpar_connection_ktype;
678         rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
679         if (rc != 0)
680                 return rc;
681
682         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
683         if (! msgs) {
684                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
685                 return -ENOMEM;
686         }
687
688         cnx->msgs = msgs;
689         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
690
691         for (i = 0; i < VETH_NUMBUFFERS; i++) {
692                 msgs[i].token = i;
693                 veth_stack_push(cnx, msgs + i);
694         }
695
696         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
697
698         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
699                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
700                 return -ENOMEM;
701         }
702
703         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
704         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
705         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
706
707         return 0;
708 }
709
710 static void veth_stop_connection(struct veth_lpar_connection *cnx)
711 {
712         if (!cnx)
713                 return;
714
715         spin_lock_irq(&cnx->lock);
716         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
717         veth_kick_statemachine(cnx);
718         spin_unlock_irq(&cnx->lock);
719
720         /* There's a slim chance the reset code has just queued the
721          * statemachine to run in five seconds. If so we need to cancel
722          * that and requeue the work to run now. */
723         if (cancel_delayed_work(&cnx->statemachine_wq)) {
724                 spin_lock_irq(&cnx->lock);
725                 veth_kick_statemachine(cnx);
726                 spin_unlock_irq(&cnx->lock);
727         }
728
729         /* Wait for the state machine to run. */
730         flush_scheduled_work();
731 }
732
733 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
734 {
735         if (!cnx)
736                 return;
737
738         if (cnx->num_events > 0)
739                 mf_deallocate_lp_events(cnx->remote_lp,
740                                       HvLpEvent_Type_VirtualLan,
741                                       cnx->num_events,
742                                       NULL, NULL);
743         if (cnx->num_ack_events > 0)
744                 mf_deallocate_lp_events(cnx->remote_lp,
745                                       HvLpEvent_Type_VirtualLan,
746                                       cnx->num_ack_events,
747                                       NULL, NULL);
748
749         kfree(cnx->msgs);
750         veth_cnx[cnx->remote_lp] = NULL;
751         kfree(cnx);
752 }
753
754 static void veth_release_connection(struct kobject *kobj)
755 {
756         struct veth_lpar_connection *cnx;
757         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
758         veth_stop_connection(cnx);
759         veth_destroy_connection(cnx);
760 }
761
762 /*
763  * net_device code
764  */
765
766 static int veth_open(struct net_device *dev)
767 {
768         struct veth_port *port = (struct veth_port *) dev->priv;
769
770         memset(&port->stats, 0, sizeof (port->stats));
771         netif_start_queue(dev);
772         return 0;
773 }
774
775 static int veth_close(struct net_device *dev)
776 {
777         netif_stop_queue(dev);
778         return 0;
779 }
780
781 static struct net_device_stats *veth_get_stats(struct net_device *dev)
782 {
783         struct veth_port *port = (struct veth_port *) dev->priv;
784
785         return &port->stats;
786 }
787
788 static int veth_change_mtu(struct net_device *dev, int new_mtu)
789 {
790         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
791                 return -EINVAL;
792         dev->mtu = new_mtu;
793         return 0;
794 }
795
796 static void veth_set_multicast_list(struct net_device *dev)
797 {
798         struct veth_port *port = (struct veth_port *) dev->priv;
799         unsigned long flags;
800
801         write_lock_irqsave(&port->mcast_gate, flags);
802
803         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
804                         (dev->mc_count > VETH_MAX_MCAST)) {
805                 port->promiscuous = 1;
806         } else {
807                 struct dev_mc_list *dmi = dev->mc_list;
808                 int i;
809
810                 port->promiscuous = 0;
811
812                 /* Update table */
813                 port->num_mcast = 0;
814
815                 for (i = 0; i < dev->mc_count; i++) {
816                         u8 *addr = dmi->dmi_addr;
817                         u64 xaddr = 0;
818
819                         if (addr[0] & 0x01) {/* multicast address? */
820                                 memcpy(&xaddr, addr, ETH_ALEN);
821                                 port->mcast_addr[port->num_mcast] = xaddr;
822                                 port->num_mcast++;
823                         }
824                         dmi = dmi->next;
825                 }
826         }
827
828         write_unlock_irqrestore(&port->mcast_gate, flags);
829 }
830
831 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
832 {
833         strncpy(info->driver, "veth", sizeof(info->driver) - 1);
834         info->driver[sizeof(info->driver) - 1] = '\0';
835         strncpy(info->version, "1.0", sizeof(info->version) - 1);
836 }
837
838 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
839 {
840         ecmd->supported = (SUPPORTED_1000baseT_Full
841                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
842         ecmd->advertising = (SUPPORTED_1000baseT_Full
843                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
844         ecmd->port = PORT_FIBRE;
845         ecmd->transceiver = XCVR_INTERNAL;
846         ecmd->phy_address = 0;
847         ecmd->speed = SPEED_1000;
848         ecmd->duplex = DUPLEX_FULL;
849         ecmd->autoneg = AUTONEG_ENABLE;
850         ecmd->maxtxpkt = 120;
851         ecmd->maxrxpkt = 120;
852         return 0;
853 }
854
855 static u32 veth_get_link(struct net_device *dev)
856 {
857         return 1;
858 }
859
860 static struct ethtool_ops ops = {
861         .get_drvinfo = veth_get_drvinfo,
862         .get_settings = veth_get_settings,
863         .get_link = veth_get_link,
864 };
865
866 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
867 {
868         struct net_device *dev;
869         struct veth_port *port;
870         int i, rc;
871
872         dev = alloc_etherdev(sizeof (struct veth_port));
873         if (! dev) {
874                 veth_error("Unable to allocate net_device structure!\n");
875                 return NULL;
876         }
877
878         port = (struct veth_port *) dev->priv;
879
880         spin_lock_init(&port->queue_lock);
881         rwlock_init(&port->mcast_gate);
882         port->stopped_map = 0;
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         SET_NETDEV_DEV(dev, vdev);
916
917         rc = register_netdev(dev);
918         if (rc != 0) {
919                 veth_error("Failed registering net device for vlan%d.\n", vlan);
920                 free_netdev(dev);
921                 return NULL;
922         }
923
924         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
925                         dev->name, vlan, port->lpar_map);
926
927         return dev;
928 }
929
930 /*
931  * Tx path
932  */
933
934 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
935                                 struct net_device *dev)
936 {
937         struct veth_lpar_connection *cnx = veth_cnx[rlp];
938         struct veth_port *port = (struct veth_port *) dev->priv;
939         HvLpEvent_Rc rc;
940         struct veth_msg *msg = NULL;
941         int err = 0;
942         unsigned long flags;
943
944         if (! cnx) {
945                 port->stats.tx_errors++;
946                 dev_kfree_skb(skb);
947                 return 0;
948         }
949
950         spin_lock_irqsave(&cnx->lock, flags);
951
952         if (! (cnx->state & VETH_STATE_READY))
953                 goto drop;
954
955         if ((skb->len - 14) > VETH_MAX_MTU)
956                 goto drop;
957
958         msg = veth_stack_pop(cnx);
959
960         if (! msg) {
961                 err = 1;
962                 goto drop;
963         }
964
965         msg->in_use = 1;
966
967         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
968                                 skb->len, DMA_TO_DEVICE);
969
970         if (dma_mapping_error(msg->data.addr[0]))
971                 goto recycle_and_drop;
972
973         /* Is it really necessary to check the length and address
974          * fields of the first entry here? */
975         msg->skb = skb;
976         msg->dev = port->dev;
977         msg->data.len[0] = skb->len;
978         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
979
980         rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
981
982         if (rc != HvLpEvent_Rc_Good)
983                 goto recycle_and_drop;
984
985         /* If the timer's not already running, start it now. */
986         if (0 == cnx->outstanding_tx)
987                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
988
989         cnx->last_contact = jiffies;
990         cnx->outstanding_tx++;
991
992         if (veth_stack_is_empty(cnx))
993                 veth_stop_queues(cnx);
994
995         spin_unlock_irqrestore(&cnx->lock, flags);
996         return 0;
997
998  recycle_and_drop:
999         /* we free the skb below, so tell veth_recycle_msg() not to. */
1000         msg->skb = NULL;
1001         veth_recycle_msg(cnx, msg);
1002  drop:
1003         port->stats.tx_errors++;
1004         dev_kfree_skb(skb);
1005         spin_unlock_irqrestore(&cnx->lock, flags);
1006         return err;
1007 }
1008
1009 static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
1010                                           HvLpIndexMap lpmask,
1011                                           struct net_device *dev)
1012 {
1013         struct veth_port *port = (struct veth_port *) dev->priv;
1014         int i;
1015         int rc;
1016
1017         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1018                 if ((lpmask & (1 << i)) == 0)
1019                         continue;
1020
1021                 rc = veth_transmit_to_one(skb_get(skb), i, dev);
1022                 if (! rc)
1023                         lpmask &= ~(1<<i);
1024         }
1025
1026         if (! lpmask) {
1027                 port->stats.tx_packets++;
1028                 port->stats.tx_bytes += skb->len;
1029         }
1030
1031         return lpmask;
1032 }
1033
1034 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1035 {
1036         unsigned char *frame = skb->data;
1037         struct veth_port *port = (struct veth_port *) dev->priv;
1038         HvLpIndexMap lpmask;
1039
1040         if (! (frame[0] & 0x01)) {
1041                 /* unicast packet */
1042                 HvLpIndex rlp = frame[5];
1043
1044                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1045                         dev_kfree_skb(skb);
1046                         return 0;
1047                 }
1048
1049                 lpmask = 1 << rlp;
1050         } else {
1051                 lpmask = port->lpar_map;
1052         }
1053
1054         veth_transmit_to_many(skb, lpmask, dev);
1055
1056         dev_kfree_skb(skb);
1057
1058         return 0;
1059 }
1060
1061 /* You must hold the connection's lock when you call this function. */
1062 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1063                              struct veth_msg *msg)
1064 {
1065         u32 dma_address, dma_length;
1066
1067         if (msg->in_use) {
1068                 msg->in_use = 0;
1069                 dma_address = msg->data.addr[0];
1070                 dma_length = msg->data.len[0];
1071
1072                 if (!dma_mapping_error(dma_address))
1073                         dma_unmap_single(msg->dev, dma_address, dma_length,
1074                                         DMA_TO_DEVICE);
1075
1076                 if (msg->skb) {
1077                         dev_kfree_skb_any(msg->skb);
1078                         msg->skb = NULL;
1079                 }
1080
1081                 memset(&msg->data, 0, sizeof(msg->data));
1082                 veth_stack_push(cnx, msg);
1083         } else if (cnx->state & VETH_STATE_OPEN) {
1084                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1085                                 cnx->remote_lp, msg->token);
1086         }
1087 }
1088
1089 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1090 {
1091         int i;
1092
1093         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1094                 struct net_device *dev = veth_dev[i];
1095                 struct veth_port *port;
1096                 unsigned long flags;
1097
1098                 if (! dev)
1099                         continue;
1100
1101                 port = (struct veth_port *)dev->priv;
1102
1103                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1104                         continue;
1105
1106                 spin_lock_irqsave(&port->queue_lock, flags);
1107
1108                 port->stopped_map &= ~(1 << cnx->remote_lp);
1109
1110                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1111                         veth_debug("cnx %d: woke queue for %s.\n",
1112                                         cnx->remote_lp, dev->name);
1113                         netif_wake_queue(dev);
1114                 }
1115                 spin_unlock_irqrestore(&port->queue_lock, flags);
1116         }
1117 }
1118
1119 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1120 {
1121         int i;
1122
1123         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1124                 struct net_device *dev = veth_dev[i];
1125                 struct veth_port *port;
1126
1127                 if (! dev)
1128                         continue;
1129
1130                 port = (struct veth_port *)dev->priv;
1131
1132                 /* If this cnx is not on the vlan for this port, continue */
1133                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1134                         continue;
1135
1136                 spin_lock(&port->queue_lock);
1137
1138                 netif_stop_queue(dev);
1139                 port->stopped_map |= (1 << cnx->remote_lp);
1140
1141                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1142                                 cnx->remote_lp, dev->name, port->stopped_map);
1143
1144                 spin_unlock(&port->queue_lock);
1145         }
1146 }
1147
1148 static void veth_timed_reset(unsigned long ptr)
1149 {
1150         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1151         unsigned long trigger_time, flags;
1152
1153         /* FIXME is it possible this fires after veth_stop_connection()?
1154          * That would reschedule the statemachine for 5 seconds and probably
1155          * execute it after the module's been unloaded. Hmm. */
1156
1157         spin_lock_irqsave(&cnx->lock, flags);
1158
1159         if (cnx->outstanding_tx > 0) {
1160                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1161
1162                 if (trigger_time < jiffies) {
1163                         cnx->state |= VETH_STATE_RESET;
1164                         veth_kick_statemachine(cnx);
1165                         veth_error("%d packets not acked by LPAR %d within %d "
1166                                         "seconds, resetting.\n",
1167                                         cnx->outstanding_tx, cnx->remote_lp,
1168                                         cnx->reset_timeout / HZ);
1169                 } else {
1170                         /* Reschedule the timer */
1171                         trigger_time = jiffies + cnx->reset_timeout;
1172                         mod_timer(&cnx->reset_timer, trigger_time);
1173                 }
1174         }
1175
1176         spin_unlock_irqrestore(&cnx->lock, flags);
1177 }
1178
1179 /*
1180  * Rx path
1181  */
1182
1183 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1184 {
1185         int wanted = 0;
1186         int i;
1187         unsigned long flags;
1188
1189         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1190                 return 1;
1191
1192         read_lock_irqsave(&port->mcast_gate, flags);
1193
1194         if (port->promiscuous) {
1195                 wanted = 1;
1196                 goto out;
1197         }
1198
1199         for (i = 0; i < port->num_mcast; ++i) {
1200                 if (port->mcast_addr[i] == mac_addr) {
1201                         wanted = 1;
1202                         break;
1203                 }
1204         }
1205
1206  out:
1207         read_unlock_irqrestore(&port->mcast_gate, flags);
1208
1209         return wanted;
1210 }
1211
1212 struct dma_chunk {
1213         u64 addr;
1214         u64 size;
1215 };
1216
1217 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1218
1219 static inline void veth_build_dma_list(struct dma_chunk *list,
1220                                        unsigned char *p, unsigned long length)
1221 {
1222         unsigned long done;
1223         int i = 1;
1224
1225         /* FIXME: skbs are continguous in real addresses.  Do we
1226          * really need to break it into PAGE_SIZE chunks, or can we do
1227          * it just at the granularity of iSeries real->absolute
1228          * mapping?  Indeed, given the way the allocator works, can we
1229          * count on them being absolutely contiguous? */
1230         list[0].addr = ISERIES_HV_ADDR(p);
1231         list[0].size = min(length,
1232                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1233
1234         done = list[0].size;
1235         while (done < length) {
1236                 list[i].addr = ISERIES_HV_ADDR(p + done);
1237                 list[i].size = min(length-done, PAGE_SIZE);
1238                 done += list[i].size;
1239                 i++;
1240         }
1241 }
1242
1243 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1244 {
1245         HvLpEvent_Rc rc;
1246
1247         rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1248                              0, &cnx->pending_acks);
1249
1250         if (rc != HvLpEvent_Rc_Good)
1251                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1252                                 cnx->remote_lp, (int)rc);
1253
1254         cnx->num_pending_acks = 0;
1255         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1256 }
1257
1258 static void veth_receive(struct veth_lpar_connection *cnx,
1259                          struct VethLpEvent *event)
1260 {
1261         struct VethFramesData *senddata = &event->u.frames_data;
1262         int startchunk = 0;
1263         int nchunks;
1264         unsigned long flags;
1265         HvLpDma_Rc rc;
1266
1267         do {
1268                 u16 length = 0;
1269                 struct sk_buff *skb;
1270                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1271                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1272                 u64 dest;
1273                 HvLpVirtualLanIndex vlan;
1274                 struct net_device *dev;
1275                 struct veth_port *port;
1276
1277                 /* FIXME: do we need this? */
1278                 memset(local_list, 0, sizeof(local_list));
1279                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1280
1281                 /* a 0 address marks the end of the valid entries */
1282                 if (senddata->addr[startchunk] == 0)
1283                         break;
1284
1285                 /* make sure that we have at least 1 EOF entry in the
1286                  * remaining entries */
1287                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1288                         veth_error("Missing EOF fragment in event "
1289                                         "eofmask = 0x%x startchunk = %d\n",
1290                                         (unsigned)senddata->eofmask,
1291                                         startchunk);
1292                         break;
1293                 }
1294
1295                 /* build list of chunks in this frame */
1296                 nchunks = 0;
1297                 do {
1298                         remote_list[nchunks].addr =
1299                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1300                         remote_list[nchunks].size =
1301                                 senddata->len[startchunk+nchunks];
1302                         length += remote_list[nchunks].size;
1303                 } while (! (senddata->eofmask &
1304                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1305
1306                 /* length == total length of all chunks */
1307                 /* nchunks == # of chunks in this frame */
1308
1309                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1310                         veth_error("Received oversize frame from LPAR %d "
1311                                         "(length = %d)\n",
1312                                         cnx->remote_lp, length);
1313                         continue;
1314                 }
1315
1316                 skb = alloc_skb(length, GFP_ATOMIC);
1317                 if (!skb)
1318                         continue;
1319
1320                 veth_build_dma_list(local_list, skb->data, length);
1321
1322                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1323                                             event->base_event.xSourceLp,
1324                                             HvLpDma_Direction_RemoteToLocal,
1325                                             cnx->src_inst,
1326                                             cnx->dst_inst,
1327                                             HvLpDma_AddressType_RealAddress,
1328                                             HvLpDma_AddressType_TceIndex,
1329                                             ISERIES_HV_ADDR(&local_list),
1330                                             ISERIES_HV_ADDR(&remote_list),
1331                                             length);
1332                 if (rc != HvLpDma_Rc_Good) {
1333                         dev_kfree_skb_irq(skb);
1334                         continue;
1335                 }
1336
1337                 vlan = skb->data[9];
1338                 dev = veth_dev[vlan];
1339                 if (! dev) {
1340                         /*
1341                          * Some earlier versions of the driver sent
1342                          * broadcasts down all connections, even to lpars
1343                          * that weren't on the relevant vlan. So ignore
1344                          * packets belonging to a vlan we're not on.
1345                          * We can also be here if we receive packets while
1346                          * the driver is going down, because then dev is NULL.
1347                          */
1348                         dev_kfree_skb_irq(skb);
1349                         continue;
1350                 }
1351
1352                 port = (struct veth_port *)dev->priv;
1353                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1354
1355                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1356                         dev_kfree_skb_irq(skb);
1357                         continue;
1358                 }
1359                 if (! veth_frame_wanted(port, dest)) {
1360                         dev_kfree_skb_irq(skb);
1361                         continue;
1362                 }
1363
1364                 skb_put(skb, length);
1365                 skb->dev = dev;
1366                 skb->protocol = eth_type_trans(skb, dev);
1367                 skb->ip_summed = CHECKSUM_NONE;
1368                 netif_rx(skb);  /* send it up */
1369                 port->stats.rx_packets++;
1370                 port->stats.rx_bytes += length;
1371         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1372
1373         /* Ack it */
1374         spin_lock_irqsave(&cnx->lock, flags);
1375         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1376
1377         cnx->pending_acks[cnx->num_pending_acks++] =
1378                 event->base_event.xCorrelationToken;
1379
1380         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1381              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1382                 veth_flush_acks(cnx);
1383
1384         spin_unlock_irqrestore(&cnx->lock, flags);
1385 }
1386
1387 static void veth_timed_ack(unsigned long ptr)
1388 {
1389         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1390         unsigned long flags;
1391
1392         /* Ack all the events */
1393         spin_lock_irqsave(&cnx->lock, flags);
1394         if (cnx->num_pending_acks > 0)
1395                 veth_flush_acks(cnx);
1396
1397         /* Reschedule the timer */
1398         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1399         add_timer(&cnx->ack_timer);
1400         spin_unlock_irqrestore(&cnx->lock, flags);
1401 }
1402
1403 static int veth_remove(struct vio_dev *vdev)
1404 {
1405         struct veth_lpar_connection *cnx;
1406         struct net_device *dev;
1407         struct veth_port *port;
1408         int i;
1409
1410         dev = veth_dev[vdev->unit_address];
1411
1412         if (! dev)
1413                 return 0;
1414
1415         port = netdev_priv(dev);
1416
1417         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1418                 cnx = veth_cnx[i];
1419
1420                 if (cnx && (port->lpar_map & (1 << i))) {
1421                         /* Drop our reference to connections on our VLAN */
1422                         kobject_put(&cnx->kobject);
1423                 }
1424         }
1425
1426         veth_dev[vdev->unit_address] = NULL;
1427         unregister_netdev(dev);
1428         free_netdev(dev);
1429
1430         return 0;
1431 }
1432
1433 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1434 {
1435         int i = vdev->unit_address;
1436         struct net_device *dev;
1437         struct veth_port *port;
1438
1439         dev = veth_probe_one(i, &vdev->dev);
1440         if (dev == NULL) {
1441                 veth_remove(vdev);
1442                 return 1;
1443         }
1444         veth_dev[i] = dev;
1445
1446         port = (struct veth_port*)netdev_priv(dev);
1447
1448         /* Start the state machine on each connection on this vlan. If we're
1449          * the first dev to do so this will commence link negotiation */
1450         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1451                 struct veth_lpar_connection *cnx;
1452
1453                 if (! (port->lpar_map & (1 << i)))
1454                         continue;
1455
1456                 cnx = veth_cnx[i];
1457                 if (!cnx)
1458                         continue;
1459
1460                 kobject_get(&cnx->kobject);
1461                 veth_kick_statemachine(cnx);
1462         }
1463
1464         return 0;
1465 }
1466
1467 /**
1468  * veth_device_table: Used by vio.c to match devices that we
1469  * support.
1470  */
1471 static struct vio_device_id veth_device_table[] __devinitdata = {
1472         { "vlan", "" },
1473         { "", "" }
1474 };
1475 MODULE_DEVICE_TABLE(vio, veth_device_table);
1476
1477 static struct vio_driver veth_driver = {
1478         .name = "iseries_veth",
1479         .id_table = veth_device_table,
1480         .probe = veth_probe,
1481         .remove = veth_remove
1482 };
1483
1484 /*
1485  * Module initialization/cleanup
1486  */
1487
1488 void __exit veth_module_cleanup(void)
1489 {
1490         int i;
1491         struct veth_lpar_connection *cnx;
1492
1493         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1494         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1495
1496         /* Make sure any work queued from Hypervisor callbacks is finished. */
1497         flush_scheduled_work();
1498
1499         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1500                 cnx = veth_cnx[i];
1501
1502                 if (!cnx)
1503                         continue;
1504
1505                 /* Drop the driver's reference to the connection */
1506                 kobject_put(&cnx->kobject);
1507         }
1508
1509         /* Unregister the driver, which will close all the netdevs and stop
1510          * the connections when they're no longer referenced. */
1511         vio_unregister_driver(&veth_driver);
1512 }
1513 module_exit(veth_module_cleanup);
1514
1515 int __init veth_module_init(void)
1516 {
1517         int i;
1518         int rc;
1519
1520         this_lp = HvLpConfig_getLpIndex_outline();
1521
1522         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1523                 rc = veth_init_connection(i);
1524                 if (rc != 0)
1525                         goto error;
1526         }
1527
1528         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1529                                   &veth_handle_event);
1530
1531         rc = vio_register_driver(&veth_driver);
1532         if (rc != 0)
1533                 goto error;
1534
1535         return 0;
1536
1537 error:
1538         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1539                 veth_destroy_connection(veth_cnx[i]);
1540         }
1541
1542         return rc;
1543 }
1544 module_init(veth_module_init);