[PATCH] iseries_veth: Remove a FIXME WRT deletion of the ack_timer
[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         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                 if (cnx->state & VETH_STATE_OPEN)
454                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
455                                                      HvLpEvent_Type_VirtualLan);
456
457                 /*
458                  * Reset ack data. This prevents the ack_timer actually
459                  * doing anything, even if it runs one more time when
460                  * we drop the lock below.
461                  */
462                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
463                 cnx->num_pending_acks = 0;
464
465                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
466                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
467                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
468                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
469
470                 /* Clean up any leftover messages */
471                 if (cnx->msgs)
472                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
473                                 veth_recycle_msg(cnx, cnx->msgs + i);
474
475                 /* Drop the lock so we can do stuff that might sleep or
476                  * take other locks. */
477                 spin_unlock_irq(&cnx->lock);
478
479                 del_timer_sync(&cnx->ack_timer);
480                 veth_flush_pending(cnx);
481
482                 spin_lock_irq(&cnx->lock);
483
484                 if (cnx->state & VETH_STATE_RESET)
485                         goto restart;
486         }
487
488         if (cnx->state & VETH_STATE_SHUTDOWN)
489                 /* It's all over, do nothing */
490                 goto out;
491
492         if ( !(cnx->state & VETH_STATE_OPEN) ) {
493                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
494                         goto cant_cope;
495
496                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
497                 cnx->src_inst =
498                         HvCallEvent_getSourceLpInstanceId(rlp,
499                                                           HvLpEvent_Type_VirtualLan);
500                 cnx->dst_inst =
501                         HvCallEvent_getTargetLpInstanceId(rlp,
502                                                           HvLpEvent_Type_VirtualLan);
503                 cnx->state |= VETH_STATE_OPEN;
504         }
505
506         if ( (cnx->state & VETH_STATE_OPEN)
507              && !(cnx->state & VETH_STATE_SENTMON) ) {
508                 rc = veth_signalevent(cnx, VethEventTypeMonitor,
509                                       HvLpEvent_AckInd_DoAck,
510                                       HvLpEvent_AckType_DeferredAck,
511                                       0, 0, 0, 0, 0, 0);
512
513                 if (rc == HvLpEvent_Rc_Good) {
514                         cnx->state |= VETH_STATE_SENTMON;
515                 } else {
516                         if ( (rc != HvLpEvent_Rc_PartitionDead)
517                              && (rc != HvLpEvent_Rc_PathClosed) )
518                                 veth_error("Error sending monitor to LPAR %d, "
519                                                 "rc = %d\n", rlp, rc);
520
521                         /* Oh well, hope we get a cap from the other
522                          * end and do better when that kicks us */
523                         goto out;
524                 }
525         }
526
527         if ( (cnx->state & VETH_STATE_OPEN)
528              && !(cnx->state & VETH_STATE_SENTCAPS)) {
529                 u64 *rawcap = (u64 *)&cnx->local_caps;
530
531                 rc = veth_signalevent(cnx, VethEventTypeCap,
532                                       HvLpEvent_AckInd_DoAck,
533                                       HvLpEvent_AckType_ImmediateAck,
534                                       0, rawcap[0], rawcap[1], rawcap[2],
535                                       rawcap[3], rawcap[4]);
536
537                 if (rc == HvLpEvent_Rc_Good) {
538                         cnx->state |= VETH_STATE_SENTCAPS;
539                 } else {
540                         if ( (rc != HvLpEvent_Rc_PartitionDead)
541                              && (rc != HvLpEvent_Rc_PathClosed) )
542                                 veth_error("Error sending caps to LPAR %d, "
543                                                 "rc = %d\n", rlp, rc);
544
545                         /* Oh well, hope we get a cap from the other
546                          * end and do better when that kicks us */
547                         goto out;
548                 }
549         }
550
551         if ((cnx->state & VETH_STATE_GOTCAPS)
552             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
553                 struct VethCapData *remote_caps = &cnx->remote_caps;
554
555                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
556                        sizeof(*remote_caps));
557
558                 spin_unlock_irq(&cnx->lock);
559                 rc = veth_process_caps(cnx);
560                 spin_lock_irq(&cnx->lock);
561
562                 /* We dropped the lock, so recheck for anything which
563                  * might mess us up */
564                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
565                         goto restart;
566
567                 cnx->cap_event.base_event.xRc = rc;
568                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
569                 if (rc == HvLpEvent_Rc_Good)
570                         cnx->state |= VETH_STATE_SENTCAPACK;
571                 else
572                         goto cant_cope;
573         }
574
575         if ((cnx->state & VETH_STATE_GOTCAPACK)
576             && (cnx->state & VETH_STATE_GOTCAPS)
577             && !(cnx->state & VETH_STATE_READY)) {
578                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
579                         /* Start the ACK timer */
580                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
581                         add_timer(&cnx->ack_timer);
582                         cnx->state |= VETH_STATE_READY;
583                 } else {
584                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
585                                         rlp, cnx->cap_ack_event.base_event.xRc);
586                         goto cant_cope;
587                 }
588         }
589
590  out:
591         spin_unlock_irq(&cnx->lock);
592         return;
593
594  cant_cope:
595         /* FIXME: we get here if something happens we really can't
596          * cope with.  The link will never work once we get here, and
597          * all we can do is not lock the rest of the system up */
598         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
599                         " (state = 0x%04lx)\n", rlp, cnx->state);
600         cnx->state |= VETH_STATE_SHUTDOWN;
601         spin_unlock_irq(&cnx->lock);
602 }
603
604 static int veth_init_connection(u8 rlp)
605 {
606         struct veth_lpar_connection *cnx;
607         struct veth_msg *msgs;
608         int i;
609
610         if ( (rlp == this_lp)
611              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
612                 return 0;
613
614         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
615         if (! cnx)
616                 return -ENOMEM;
617         memset(cnx, 0, sizeof(*cnx));
618
619         cnx->remote_lp = rlp;
620         spin_lock_init(&cnx->lock);
621         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
622         init_timer(&cnx->ack_timer);
623         cnx->ack_timer.function = veth_timed_ack;
624         cnx->ack_timer.data = (unsigned long) cnx;
625         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
626
627         veth_cnx[rlp] = cnx;
628
629         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
630         if (! msgs) {
631                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
632                 return -ENOMEM;
633         }
634
635         cnx->msgs = msgs;
636         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
637         spin_lock_init(&cnx->msg_stack_lock);
638
639         for (i = 0; i < VETH_NUMBUFFERS; i++) {
640                 msgs[i].token = i;
641                 veth_stack_push(cnx, msgs + i);
642         }
643
644         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
645
646         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
647                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
648                 return -ENOMEM;
649         }
650
651         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
652         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
653         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
654
655         return 0;
656 }
657
658 static void veth_stop_connection(u8 rlp)
659 {
660         struct veth_lpar_connection *cnx = veth_cnx[rlp];
661
662         if (! cnx)
663                 return;
664
665         spin_lock_irq(&cnx->lock);
666         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
667         veth_kick_statemachine(cnx);
668         spin_unlock_irq(&cnx->lock);
669
670         /* Wait for the state machine to run. */
671         flush_scheduled_work();
672
673         if (cnx->num_events > 0)
674                 mf_deallocate_lp_events(cnx->remote_lp,
675                                       HvLpEvent_Type_VirtualLan,
676                                       cnx->num_events,
677                                       NULL, NULL);
678         if (cnx->num_ack_events > 0)
679                 mf_deallocate_lp_events(cnx->remote_lp,
680                                       HvLpEvent_Type_VirtualLan,
681                                       cnx->num_ack_events,
682                                       NULL, NULL);
683 }
684
685 static void veth_destroy_connection(u8 rlp)
686 {
687         struct veth_lpar_connection *cnx = veth_cnx[rlp];
688
689         if (! cnx)
690                 return;
691
692         kfree(cnx->msgs);
693         kfree(cnx);
694         veth_cnx[rlp] = NULL;
695 }
696
697 /*
698  * net_device code
699  */
700
701 static int veth_open(struct net_device *dev)
702 {
703         struct veth_port *port = (struct veth_port *) dev->priv;
704
705         memset(&port->stats, 0, sizeof (port->stats));
706         netif_start_queue(dev);
707         return 0;
708 }
709
710 static int veth_close(struct net_device *dev)
711 {
712         netif_stop_queue(dev);
713         return 0;
714 }
715
716 static struct net_device_stats *veth_get_stats(struct net_device *dev)
717 {
718         struct veth_port *port = (struct veth_port *) dev->priv;
719
720         return &port->stats;
721 }
722
723 static int veth_change_mtu(struct net_device *dev, int new_mtu)
724 {
725         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
726                 return -EINVAL;
727         dev->mtu = new_mtu;
728         return 0;
729 }
730
731 static void veth_set_multicast_list(struct net_device *dev)
732 {
733         struct veth_port *port = (struct veth_port *) dev->priv;
734         unsigned long flags;
735
736         write_lock_irqsave(&port->mcast_gate, flags);
737
738         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
739                 printk(KERN_INFO "%s: Promiscuous mode enabled.\n",
740                        dev->name);
741                 port->promiscuous = 1;
742         } else if ( (dev->flags & IFF_ALLMULTI)
743                     || (dev->mc_count > VETH_MAX_MCAST) ) {
744                 port->all_mcast = 1;
745         } else {
746                 struct dev_mc_list *dmi = dev->mc_list;
747                 int i;
748
749                 /* Update table */
750                 port->num_mcast = 0;
751
752                 for (i = 0; i < dev->mc_count; i++) {
753                         u8 *addr = dmi->dmi_addr;
754                         u64 xaddr = 0;
755
756                         if (addr[0] & 0x01) {/* multicast address? */
757                                 memcpy(&xaddr, addr, ETH_ALEN);
758                                 port->mcast_addr[port->num_mcast] = xaddr;
759                                 port->num_mcast++;
760                         }
761                         dmi = dmi->next;
762                 }
763         }
764
765         write_unlock_irqrestore(&port->mcast_gate, flags);
766 }
767
768 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
769 {
770         strncpy(info->driver, "veth", sizeof(info->driver) - 1);
771         info->driver[sizeof(info->driver) - 1] = '\0';
772         strncpy(info->version, "1.0", sizeof(info->version) - 1);
773 }
774
775 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
776 {
777         ecmd->supported = (SUPPORTED_1000baseT_Full
778                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
779         ecmd->advertising = (SUPPORTED_1000baseT_Full
780                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
781         ecmd->port = PORT_FIBRE;
782         ecmd->transceiver = XCVR_INTERNAL;
783         ecmd->phy_address = 0;
784         ecmd->speed = SPEED_1000;
785         ecmd->duplex = DUPLEX_FULL;
786         ecmd->autoneg = AUTONEG_ENABLE;
787         ecmd->maxtxpkt = 120;
788         ecmd->maxrxpkt = 120;
789         return 0;
790 }
791
792 static u32 veth_get_link(struct net_device *dev)
793 {
794         return 1;
795 }
796
797 static struct ethtool_ops ops = {
798         .get_drvinfo = veth_get_drvinfo,
799         .get_settings = veth_get_settings,
800         .get_link = veth_get_link,
801 };
802
803 static void veth_tx_timeout(struct net_device *dev)
804 {
805         struct veth_port *port = (struct veth_port *)dev->priv;
806         struct net_device_stats *stats = &port->stats;
807         unsigned long flags;
808         int i;
809
810         stats->tx_errors++;
811
812         spin_lock_irqsave(&port->pending_gate, flags);
813
814         if (!port->pending_lpmask) {
815                 spin_unlock_irqrestore(&port->pending_gate, flags);
816                 return;
817         }
818
819         printk(KERN_WARNING "%s: Tx timeout!  Resetting lp connections: %08x\n",
820                dev->name, port->pending_lpmask);
821
822         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
823                 struct veth_lpar_connection *cnx = veth_cnx[i];
824
825                 if (! (port->pending_lpmask & (1<<i)))
826                         continue;
827
828                 /* If we're pending on it, we must be connected to it,
829                  * so we should certainly have a structure for it. */
830                 BUG_ON(! cnx);
831
832                 /* Theoretically we could be kicking a connection
833                  * which doesn't deserve it, but in practice if we've
834                  * had a Tx timeout, the pending_lpmask will have
835                  * exactly one bit set - the connection causing the
836                  * problem. */
837                 spin_lock(&cnx->lock);
838                 cnx->state |= VETH_STATE_RESET;
839                 veth_kick_statemachine(cnx);
840                 spin_unlock(&cnx->lock);
841         }
842
843         spin_unlock_irqrestore(&port->pending_gate, flags);
844 }
845
846 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
847 {
848         struct net_device *dev;
849         struct veth_port *port;
850         int i, rc;
851
852         dev = alloc_etherdev(sizeof (struct veth_port));
853         if (! dev) {
854                 veth_error("Unable to allocate net_device structure!\n");
855                 return NULL;
856         }
857
858         port = (struct veth_port *) dev->priv;
859
860         spin_lock_init(&port->pending_gate);
861         rwlock_init(&port->mcast_gate);
862
863         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
864                 HvLpVirtualLanIndexMap map;
865
866                 if (i == this_lp)
867                         continue;
868                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
869                 if (map & (0x8000 >> vlan))
870                         port->lpar_map |= (1 << i);
871         }
872         port->dev = vdev;
873
874         dev->dev_addr[0] = 0x02;
875         dev->dev_addr[1] = 0x01;
876         dev->dev_addr[2] = 0xff;
877         dev->dev_addr[3] = vlan;
878         dev->dev_addr[4] = 0xff;
879         dev->dev_addr[5] = this_lp;
880
881         dev->mtu = VETH_MAX_MTU;
882
883         memcpy(&port->mac_addr, dev->dev_addr, 6);
884
885         dev->open = veth_open;
886         dev->hard_start_xmit = veth_start_xmit;
887         dev->stop = veth_close;
888         dev->get_stats = veth_get_stats;
889         dev->change_mtu = veth_change_mtu;
890         dev->set_mac_address = NULL;
891         dev->set_multicast_list = veth_set_multicast_list;
892         SET_ETHTOOL_OPS(dev, &ops);
893
894         dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000);
895         dev->tx_timeout = veth_tx_timeout;
896
897         SET_NETDEV_DEV(dev, vdev);
898
899         rc = register_netdev(dev);
900         if (rc != 0) {
901                 veth_error("Failed registering net device for vlan%d.\n", vlan);
902                 free_netdev(dev);
903                 return NULL;
904         }
905
906         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
907                         dev->name, vlan, port->lpar_map);
908
909         return dev;
910 }
911
912 /*
913  * Tx path
914  */
915
916 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
917                                 struct net_device *dev)
918 {
919         struct veth_lpar_connection *cnx = veth_cnx[rlp];
920         struct veth_port *port = (struct veth_port *) dev->priv;
921         HvLpEvent_Rc rc;
922         u32 dma_address, dma_length;
923         struct veth_msg *msg = NULL;
924         int err = 0;
925         unsigned long flags;
926
927         if (! cnx) {
928                 port->stats.tx_errors++;
929                 dev_kfree_skb(skb);
930                 return 0;
931         }
932
933         spin_lock_irqsave(&cnx->lock, flags);
934
935         if (! (cnx->state & VETH_STATE_READY))
936                 goto drop;
937
938         if ((skb->len - 14) > VETH_MAX_MTU)
939                 goto drop;
940
941         msg = veth_stack_pop(cnx);
942
943         if (! msg) {
944                 err = 1;
945                 goto drop;
946         }
947
948         dma_length = skb->len;
949         dma_address = dma_map_single(port->dev, skb->data,
950                                      dma_length, DMA_TO_DEVICE);
951
952         if (dma_mapping_error(dma_address))
953                 goto recycle_and_drop;
954
955         /* Is it really necessary to check the length and address
956          * fields of the first entry here? */
957         msg->skb = skb;
958         msg->dev = port->dev;
959         msg->data.addr[0] = dma_address;
960         msg->data.len[0] = dma_length;
961         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
962         set_bit(0, &(msg->in_use));
963         rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
964
965         if (rc != HvLpEvent_Rc_Good)
966                 goto recycle_and_drop;
967
968         spin_unlock_irqrestore(&cnx->lock, flags);
969         return 0;
970
971  recycle_and_drop:
972         msg->skb = NULL;
973         /* need to set in use to make veth_recycle_msg in case this
974          * was a mapping failure */
975         set_bit(0, &msg->in_use);
976         veth_recycle_msg(cnx, msg);
977  drop:
978         port->stats.tx_errors++;
979         dev_kfree_skb(skb);
980         spin_unlock_irqrestore(&cnx->lock, flags);
981         return err;
982 }
983
984 static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
985                                           HvLpIndexMap lpmask,
986                                           struct net_device *dev)
987 {
988         struct veth_port *port = (struct veth_port *) dev->priv;
989         int i;
990         int rc;
991
992         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
993                 if ((lpmask & (1 << i)) == 0)
994                         continue;
995
996                 rc = veth_transmit_to_one(skb_get(skb), i, dev);
997                 if (! rc)
998                         lpmask &= ~(1<<i);
999         }
1000
1001         if (! lpmask) {
1002                 port->stats.tx_packets++;
1003                 port->stats.tx_bytes += skb->len;
1004         }
1005
1006         return lpmask;
1007 }
1008
1009 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1010 {
1011         unsigned char *frame = skb->data;
1012         struct veth_port *port = (struct veth_port *) dev->priv;
1013         unsigned long flags;
1014         HvLpIndexMap lpmask;
1015
1016         if (! (frame[0] & 0x01)) {
1017                 /* unicast packet */
1018                 HvLpIndex rlp = frame[5];
1019
1020                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1021                         dev_kfree_skb(skb);
1022                         return 0;
1023                 }
1024
1025                 lpmask = 1 << rlp;
1026         } else {
1027                 lpmask = port->lpar_map;
1028         }
1029
1030         spin_lock_irqsave(&port->pending_gate, flags);
1031
1032         lpmask = veth_transmit_to_many(skb, lpmask, dev);
1033
1034         dev->trans_start = jiffies;
1035
1036         if (! lpmask) {
1037                 dev_kfree_skb(skb);
1038         } else {
1039                 if (port->pending_skb) {
1040                         veth_error("%s: TX while skb was pending!\n",
1041                                    dev->name);
1042                         dev_kfree_skb(skb);
1043                         spin_unlock_irqrestore(&port->pending_gate, flags);
1044                         return 1;
1045                 }
1046
1047                 port->pending_skb = skb;
1048                 port->pending_lpmask = lpmask;
1049                 netif_stop_queue(dev);
1050         }
1051
1052         spin_unlock_irqrestore(&port->pending_gate, flags);
1053
1054         return 0;
1055 }
1056
1057 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1058                              struct veth_msg *msg)
1059 {
1060         u32 dma_address, dma_length;
1061
1062         if (test_and_clear_bit(0, &msg->in_use)) {
1063                 dma_address = msg->data.addr[0];
1064                 dma_length = msg->data.len[0];
1065
1066                 dma_unmap_single(msg->dev, dma_address, dma_length,
1067                                  DMA_TO_DEVICE);
1068
1069                 if (msg->skb) {
1070                         dev_kfree_skb_any(msg->skb);
1071                         msg->skb = NULL;
1072                 }
1073
1074                 memset(&msg->data, 0, sizeof(msg->data));
1075                 veth_stack_push(cnx, msg);
1076         } else if (cnx->state & VETH_STATE_OPEN) {
1077                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1078                                 cnx->remote_lp, msg->token);
1079         }
1080 }
1081
1082 static void veth_flush_pending(struct veth_lpar_connection *cnx)
1083 {
1084         int i;
1085         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1086                 struct net_device *dev = veth_dev[i];
1087                 struct veth_port *port;
1088                 unsigned long flags;
1089
1090                 if (! dev)
1091                         continue;
1092
1093                 port = (struct veth_port *)dev->priv;
1094
1095                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1096                         continue;
1097
1098                 spin_lock_irqsave(&port->pending_gate, flags);
1099                 if (port->pending_skb) {
1100                         port->pending_lpmask =
1101                                 veth_transmit_to_many(port->pending_skb,
1102                                                       port->pending_lpmask,
1103                                                       dev);
1104                         if (! port->pending_lpmask) {
1105                                 dev_kfree_skb_any(port->pending_skb);
1106                                 port->pending_skb = NULL;
1107                                 netif_wake_queue(dev);
1108                         }
1109                 }
1110                 spin_unlock_irqrestore(&port->pending_gate, flags);
1111         }
1112 }
1113
1114 /*
1115  * Rx path
1116  */
1117
1118 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1119 {
1120         int wanted = 0;
1121         int i;
1122         unsigned long flags;
1123
1124         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1125                 return 1;
1126
1127         if (! (((char *) &mac_addr)[0] & 0x01))
1128                 return 0;
1129
1130         read_lock_irqsave(&port->mcast_gate, flags);
1131
1132         if (port->promiscuous || port->all_mcast) {
1133                 wanted = 1;
1134                 goto out;
1135         }
1136
1137         for (i = 0; i < port->num_mcast; ++i) {
1138                 if (port->mcast_addr[i] == mac_addr) {
1139                         wanted = 1;
1140                         break;
1141                 }
1142         }
1143
1144  out:
1145         read_unlock_irqrestore(&port->mcast_gate, flags);
1146
1147         return wanted;
1148 }
1149
1150 struct dma_chunk {
1151         u64 addr;
1152         u64 size;
1153 };
1154
1155 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1156
1157 static inline void veth_build_dma_list(struct dma_chunk *list,
1158                                        unsigned char *p, unsigned long length)
1159 {
1160         unsigned long done;
1161         int i = 1;
1162
1163         /* FIXME: skbs are continguous in real addresses.  Do we
1164          * really need to break it into PAGE_SIZE chunks, or can we do
1165          * it just at the granularity of iSeries real->absolute
1166          * mapping?  Indeed, given the way the allocator works, can we
1167          * count on them being absolutely contiguous? */
1168         list[0].addr = ISERIES_HV_ADDR(p);
1169         list[0].size = min(length,
1170                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1171
1172         done = list[0].size;
1173         while (done < length) {
1174                 list[i].addr = ISERIES_HV_ADDR(p + done);
1175                 list[i].size = min(length-done, PAGE_SIZE);
1176                 done += list[i].size;
1177                 i++;
1178         }
1179 }
1180
1181 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1182 {
1183         HvLpEvent_Rc rc;
1184
1185         rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1186                              0, &cnx->pending_acks);
1187
1188         if (rc != HvLpEvent_Rc_Good)
1189                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1190                                 cnx->remote_lp, (int)rc);
1191
1192         cnx->num_pending_acks = 0;
1193         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1194 }
1195
1196 static void veth_receive(struct veth_lpar_connection *cnx,
1197                          struct VethLpEvent *event)
1198 {
1199         struct VethFramesData *senddata = &event->u.frames_data;
1200         int startchunk = 0;
1201         int nchunks;
1202         unsigned long flags;
1203         HvLpDma_Rc rc;
1204
1205         do {
1206                 u16 length = 0;
1207                 struct sk_buff *skb;
1208                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1209                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1210                 u64 dest;
1211                 HvLpVirtualLanIndex vlan;
1212                 struct net_device *dev;
1213                 struct veth_port *port;
1214
1215                 /* FIXME: do we need this? */
1216                 memset(local_list, 0, sizeof(local_list));
1217                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1218
1219                 /* a 0 address marks the end of the valid entries */
1220                 if (senddata->addr[startchunk] == 0)
1221                         break;
1222
1223                 /* make sure that we have at least 1 EOF entry in the
1224                  * remaining entries */
1225                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1226                         veth_error("Missing EOF fragment in event "
1227                                         "eofmask = 0x%x startchunk = %d\n",
1228                                         (unsigned)senddata->eofmask,
1229                                         startchunk);
1230                         break;
1231                 }
1232
1233                 /* build list of chunks in this frame */
1234                 nchunks = 0;
1235                 do {
1236                         remote_list[nchunks].addr =
1237                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1238                         remote_list[nchunks].size =
1239                                 senddata->len[startchunk+nchunks];
1240                         length += remote_list[nchunks].size;
1241                 } while (! (senddata->eofmask &
1242                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1243
1244                 /* length == total length of all chunks */
1245                 /* nchunks == # of chunks in this frame */
1246
1247                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1248                         veth_error("Received oversize frame from LPAR %d "
1249                                         "(length = %d)\n",
1250                                         cnx->remote_lp, length);
1251                         continue;
1252                 }
1253
1254                 skb = alloc_skb(length, GFP_ATOMIC);
1255                 if (!skb)
1256                         continue;
1257
1258                 veth_build_dma_list(local_list, skb->data, length);
1259
1260                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1261                                             event->base_event.xSourceLp,
1262                                             HvLpDma_Direction_RemoteToLocal,
1263                                             cnx->src_inst,
1264                                             cnx->dst_inst,
1265                                             HvLpDma_AddressType_RealAddress,
1266                                             HvLpDma_AddressType_TceIndex,
1267                                             ISERIES_HV_ADDR(&local_list),
1268                                             ISERIES_HV_ADDR(&remote_list),
1269                                             length);
1270                 if (rc != HvLpDma_Rc_Good) {
1271                         dev_kfree_skb_irq(skb);
1272                         continue;
1273                 }
1274
1275                 vlan = skb->data[9];
1276                 dev = veth_dev[vlan];
1277                 if (! dev) {
1278                         /*
1279                          * Some earlier versions of the driver sent
1280                          * broadcasts down all connections, even to lpars
1281                          * that weren't on the relevant vlan. So ignore
1282                          * packets belonging to a vlan we're not on.
1283                          * We can also be here if we receive packets while
1284                          * the driver is going down, because then dev is NULL.
1285                          */
1286                         dev_kfree_skb_irq(skb);
1287                         continue;
1288                 }
1289
1290                 port = (struct veth_port *)dev->priv;
1291                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1292
1293                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1294                         dev_kfree_skb_irq(skb);
1295                         continue;
1296                 }
1297                 if (! veth_frame_wanted(port, dest)) {
1298                         dev_kfree_skb_irq(skb);
1299                         continue;
1300                 }
1301
1302                 skb_put(skb, length);
1303                 skb->dev = dev;
1304                 skb->protocol = eth_type_trans(skb, dev);
1305                 skb->ip_summed = CHECKSUM_NONE;
1306                 netif_rx(skb);  /* send it up */
1307                 port->stats.rx_packets++;
1308                 port->stats.rx_bytes += length;
1309         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1310
1311         /* Ack it */
1312         spin_lock_irqsave(&cnx->lock, flags);
1313         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1314
1315         cnx->pending_acks[cnx->num_pending_acks++] =
1316                 event->base_event.xCorrelationToken;
1317
1318         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1319              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1320                 veth_flush_acks(cnx);
1321
1322         spin_unlock_irqrestore(&cnx->lock, flags);
1323 }
1324
1325 static void veth_timed_ack(unsigned long ptr)
1326 {
1327         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1328         unsigned long flags;
1329
1330         /* Ack all the events */
1331         spin_lock_irqsave(&cnx->lock, flags);
1332         if (cnx->num_pending_acks > 0)
1333                 veth_flush_acks(cnx);
1334
1335         /* Reschedule the timer */
1336         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1337         add_timer(&cnx->ack_timer);
1338         spin_unlock_irqrestore(&cnx->lock, flags);
1339 }
1340
1341 static int veth_remove(struct vio_dev *vdev)
1342 {
1343         int i = vdev->unit_address;
1344         struct net_device *dev;
1345
1346         dev = veth_dev[i];
1347         if (dev != NULL) {
1348                 veth_dev[i] = NULL;
1349                 unregister_netdev(dev);
1350                 free_netdev(dev);
1351         }
1352         return 0;
1353 }
1354
1355 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1356 {
1357         int i = vdev->unit_address;
1358         struct net_device *dev;
1359
1360         dev = veth_probe_one(i, &vdev->dev);
1361         if (dev == NULL) {
1362                 veth_remove(vdev);
1363                 return 1;
1364         }
1365         veth_dev[i] = dev;
1366
1367         /* Start the state machine on each connection, to commence
1368          * link negotiation */
1369         for (i = 0; i < HVMAXARCHITECTEDLPS; i++)
1370                 if (veth_cnx[i])
1371                         veth_kick_statemachine(veth_cnx[i]);
1372
1373         return 0;
1374 }
1375
1376 /**
1377  * veth_device_table: Used by vio.c to match devices that we
1378  * support.
1379  */
1380 static struct vio_device_id veth_device_table[] __devinitdata = {
1381         { "vlan", "" },
1382         { "", "" }
1383 };
1384 MODULE_DEVICE_TABLE(vio, veth_device_table);
1385
1386 static struct vio_driver veth_driver = {
1387         .name = "iseries_veth",
1388         .id_table = veth_device_table,
1389         .probe = veth_probe,
1390         .remove = veth_remove
1391 };
1392
1393 /*
1394  * Module initialization/cleanup
1395  */
1396
1397 void __exit veth_module_cleanup(void)
1398 {
1399         int i;
1400
1401         /* Stop the queues first to stop any new packets being sent. */
1402         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++)
1403                 if (veth_dev[i])
1404                         netif_stop_queue(veth_dev[i]);
1405
1406         /* Stop the connections before we unregister the driver. This
1407          * ensures there's no skbs lying around holding the device open. */
1408         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1409                 veth_stop_connection(i);
1410
1411         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1412
1413         /* Hypervisor callbacks may have scheduled more work while we
1414          * were stoping connections. Now that we've disconnected from
1415          * the hypervisor make sure everything's finished. */
1416         flush_scheduled_work();
1417
1418         vio_unregister_driver(&veth_driver);
1419
1420         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1421                 veth_destroy_connection(i);
1422
1423 }
1424 module_exit(veth_module_cleanup);
1425
1426 int __init veth_module_init(void)
1427 {
1428         int i;
1429         int rc;
1430
1431         this_lp = HvLpConfig_getLpIndex_outline();
1432
1433         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1434                 rc = veth_init_connection(i);
1435                 if (rc != 0) {
1436                         veth_module_cleanup();
1437                         return rc;
1438                 }
1439         }
1440
1441         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1442                                   &veth_handle_event);
1443
1444         return vio_register_driver(&veth_driver);
1445 }
1446 module_init(veth_module_init);