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[PATCH] iseries_veth: Remove a FIXME WRT deletion of the ack_timer
[net-next-2.6.git] / drivers / net / iseries_veth.c
CommitLineData
1da177e4
LT		 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
61a3c696
ME		 82#undef DEBUG
83
1da177e4
LT		 84#include "iseries_veth.h"
85
86MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
87MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
88MODULE_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
116struct 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
125struct 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
150struct 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
167static HvLpIndex this_lp;
168static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
169static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
170
171static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
172static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
173static void veth_flush_pending(struct veth_lpar_connection *cnx);
174static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
175static void veth_timed_ack(unsigned long connectionPtr);
176
177/*
178 * Utility functions
179 */
180
61a3c696
ME		 181#define veth_info(fmt, args...) \
182 printk(KERN_INFO "iseries_veth: " fmt, ## args)
1da177e4
LT		 183
184#define veth_error(fmt, args...) \
61a3c696
ME		 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
1da177e4
LT		 193
194static 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
205static 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
218static inline HvLpEvent_Rc
219veth_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
233static 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
243struct veth_allocation {
244 struct completion c;
245 int num;
246};
247
248static 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
256static 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
272static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
273{
274 schedule_work(&cnx->statemachine_wq);
275}
276
277static 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) {
61a3c696 290 veth_error("Received a second capabilities from LPAR %d.\n",
1da177e4
LT		 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
302static 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) {
61a3c696 309 veth_error("Received a second capabilities ack from LPAR %d.\n",
1da177e4
LT		 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
320static 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);
61a3c696 326 veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
1da177e4
LT		 327 cnx->state |= VETH_STATE_RESET;
328 veth_kick_statemachine(cnx);
329 spin_unlock_irqrestore(&cnx->lock, flags);
330}
331
332static 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:
61a3c696
ME		 347 veth_error("Unknown ack type %d from LPAR %d.\n",
348 event->base_event.xSubtype, rlp);
1da177e4
LT		 349 };
350}
351
352static 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:
61a3c696
ME		 384 veth_error("Unknown interrupt type %d from LPAR %d.\n",
385 event->base_event.xSubtype, rlp);
1da177e4
LT		 386 };
387}
388
389static 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
399static 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) ) {
61a3c696
ME		 411 veth_error("Received incompatible capabilities from LPAR %d.\n",
412 cnx->remote_lp);
1da177e4
LT		 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) {
61a3c696
ME		 429 veth_error("Couldn't allocate enough ack events "
430 "for LPAR %d.\n", cnx->remote_lp);
1da177e4
LT		 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 */
441static 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
1da177e4
LT		 453 if (cnx->state & VETH_STATE_OPEN)
454 HvCallEvent_closeLpEventPath(cnx->remote_lp,
455 HvLpEvent_Type_VirtualLan);
456
abfda471
ME		 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 */
1da177e4
LT		 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);
abfda471
ME		 474
475 /* Drop the lock so we can do stuff that might sleep or
476 * take other locks. */
1da177e4 477 spin_unlock_irq(&cnx->lock);
abfda471
ME		 478
479 del_timer_sync(&cnx->ack_timer);
1da177e4 480 veth_flush_pending(cnx);
abfda471 481
1da177e4 482 spin_lock_irq(&cnx->lock);
abfda471 483
1da177e4
LT		 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) )
61a3c696
ME		 518 veth_error("Error sending monitor to LPAR %d, "
519 "rc = %d\n", rlp, rc);
1da177e4
LT		 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) )
61a3c696
ME		 542 veth_error("Error sending caps to LPAR %d, "
543 "rc = %d\n", rlp, rc);
544
1da177e4
LT		 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 {
61a3c696
ME		 584 veth_error("Caps rejected by LPAR %d, rc = %d\n",
585 rlp, cnx->cap_ack_event.base_event.xRc);
1da177e4
LT		 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 */
61a3c696
ME		 598 veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
599 " (state = 0x%04lx)\n", rlp, cnx->state);
1da177e4
LT		 600 cnx->state |= VETH_STATE_SHUTDOWN;
601 spin_unlock_irq(&cnx->lock);
602}
603
604static 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) {
61a3c696 631 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
1da177e4
LT		 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)) {
61a3c696 647 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
1da177e4
LT		 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
658static 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
abfda471 670 /* Wait for the state machine to run. */
1da177e4
LT		 671 flush_scheduled_work();
672
1da177e4
LT		 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
685static 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
701static 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
710static int veth_close(struct net_device *dev)
711{
712 netif_stop_queue(dev);
713 return 0;
714}
715
716static 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
723static 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
731static 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
768static 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
775static 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
792static u32 veth_get_link(struct net_device *dev)
793{
794 return 1;
795}
796
797static struct ethtool_ops ops = {
798 .get_drvinfo = veth_get_drvinfo,
799 .get_settings = veth_get_settings,
800 .get_link = veth_get_link,
801};
802
803static 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
243cd55e
ME		 814 if (!port->pending_lpmask) {
815 spin_unlock_irqrestore(&port->pending_gate, flags);
816 return;
817 }
818
1da177e4
LT		 819 printk(KERN_WARNING "%s: Tx timeout! Resetting lp connections: %08x\n",
820 dev->name, port->pending_lpmask);
821
1da177e4
LT		 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
846static 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) {
61a3c696 901 veth_error("Failed registering net device for vlan%d.\n", vlan);
1da177e4
LT		 902 free_netdev(dev);
903 return NULL;
904 }
905
61a3c696
ME		 906 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
907 dev->name, vlan, port->lpar_map);
1da177e4
LT		 908
909 return dev;
910}
911
912/*
913 * Tx path
914 */
915
916static 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
f27eff1f 935 if (! (cnx->state & VETH_STATE_READY))
1da177e4
LT		 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
984static 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
1009static 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
eb235aef
ME		 1034 dev->trans_start = jiffies;
1035
1da177e4
LT		 1036 if (! lpmask) {
1037 dev_kfree_skb(skb);
1038 } else {
1039 if (port->pending_skb) {
61a3c696 1040 veth_error("%s: TX while skb was pending!\n",
1da177e4
LT		 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
1057static 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);
61a3c696
ME		 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 }
1da177e4
LT		 1080}
1081
1082static 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
1118static 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
1150struct 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
1157static 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
1181static 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)
61a3c696
ME		 1189 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1190 cnx->remote_lp, (int)rc);
1da177e4
LT		 1191
1192 cnx->num_pending_acks = 0;
1193 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1194}
1195
1196static 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))) {
61a3c696
ME		 1226 veth_error("Missing EOF fragment in event "
1227 "eofmask = 0x%x startchunk = %d\n",
1228 (unsigned)senddata->eofmask,
1229 startchunk);
1da177e4
LT		 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) {
61a3c696
ME		 1248 veth_error("Received oversize frame from LPAR %d "
1249 "(length = %d)\n",
1250 cnx->remote_lp, length);
1da177e4
LT		 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];
41664c03
ME		 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);
1da177e4 1287 continue;
41664c03 1288 }
1da177e4
LT		 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
1325static 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
1341static 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
1355static 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 */
1380static struct vio_device_id veth_device_table[] __devinitdata = {
1381 { "vlan", "" },
fb120da6 1382 { "", "" }
1da177e4
LT		 1383};
1384MODULE_DEVICE_TABLE(vio, veth_device_table);
1385
1386static 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
1397void __exit veth_module_cleanup(void)
1398{
1399 int i;
1400
b2e0852e
ME		 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]);
1da177e4 1405
b2e0852e
ME		 1406 /* Stop the connections before we unregister the driver. This
1407 * ensures there's no skbs lying around holding the device open. */
1da177e4
LT		 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
b2e0852e 1414 * were stoping connections. Now that we've disconnected from
1da177e4
LT		 1415 * the hypervisor make sure everything's finished. */
1416 flush_scheduled_work();
1417
b2e0852e
ME		 1418 vio_unregister_driver(&veth_driver);
1419
1da177e4
LT		 1420 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
1421 veth_destroy_connection(i);
1422
1423}
1424module_exit(veth_module_cleanup);
1425
1426int __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}
1446module_init(veth_module_init);
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