?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
blob08c4396cf41864b89c280a117ff05ccecda48cdc
1 /*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
36 */
37
38 #include <linux/delay.h>
39 #include <linux/dma-mapping.h>
40
41 #include <rdma/ib_cache.h>
42
43 #include "ipoib.h"
44
45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
46 static int data_debug_level;
47
48 module_param(data_debug_level, int, 0644);
49 MODULE_PARM_DESC(data_debug_level,
50 "Enable data path debug tracing if > 0");
51 #endif
52
53 static DEFINE_MUTEX(pkey_mutex);
54
55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
56 struct ib_pd *pd, struct ib_ah_attr *attr)
57 {
58 struct ipoib_ah *ah;
59
60 ah = kmalloc(sizeof *ah, GFP_KERNEL);
61 if (!ah)
62 return NULL;
63
64 ah->dev = dev;
65 ah->last_send = 0;
66 kref_init(&ah->ref);
67
68 ah->ah = ib_create_ah(pd, attr);
69 if (IS_ERR(ah->ah)) {
70 kfree(ah);
71 ah = NULL;
72 } else
73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
74
75 return ah;
76 }
77
78 void ipoib_free_ah(struct kref *kref)
79 {
80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
82
83 unsigned long flags;
84
85 spin_lock_irqsave(&priv->lock, flags);
86 list_add_tail(&ah->list, &priv->dead_ahs);
87 spin_unlock_irqrestore(&priv->lock, flags);
88 }
89
90 static int ipoib_ib_post_receive(struct net_device *dev, int id)
91 {
92 struct ipoib_dev_priv *priv = netdev_priv(dev);
93 struct ib_sge list;
94 struct ib_recv_wr param;
95 struct ib_recv_wr *bad_wr;
96 int ret;
97
98 list.addr = priv->rx_ring[id].mapping;
99 list.length = IPOIB_BUF_SIZE;
100 list.lkey = priv->mr->lkey;
101
102 param.next = NULL;
103 param.wr_id = id | IPOIB_OP_RECV;
104 param.sg_list = &list;
105 param.num_sge = 1;
106
107 ret = ib_post_recv(priv->qp, &param, &bad_wr);
108 if (unlikely(ret)) {
109 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
110 ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
111 IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
112 dev_kfree_skb_any(priv->rx_ring[id].skb);
113 priv->rx_ring[id].skb = NULL;
114 }
115
116 return ret;
117 }
118
119 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
120 {
121 struct ipoib_dev_priv *priv = netdev_priv(dev);
122 struct sk_buff *skb;
123 u64 addr;
124
125 skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
126 if (!skb)
127 return -ENOMEM;
128
129 /*
130 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
131 * header. So we need 4 more bytes to get to 48 and align the
132 * IP header to a multiple of 16.
133 */
134 skb_reserve(skb, 4);
135
136 addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
137 DMA_FROM_DEVICE);
138 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
139 dev_kfree_skb_any(skb);
140 return -EIO;
141 }
142
143 priv->rx_ring[id].skb = skb;
144 priv->rx_ring[id].mapping = addr;
145
146 return 0;
147 }
148
149 static int ipoib_ib_post_receives(struct net_device *dev)
150 {
151 struct ipoib_dev_priv *priv = netdev_priv(dev);
152 int i;
153
154 for (i = 0; i < ipoib_recvq_size; ++i) {
155 if (ipoib_alloc_rx_skb(dev, i)) {
156 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
157 return -ENOMEM;
158 }
159 if (ipoib_ib_post_receive(dev, i)) {
160 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
161 return -EIO;
162 }
163 }
164
165 return 0;
166 }
167
168 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
169 {
170 struct ipoib_dev_priv *priv = netdev_priv(dev);
171 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
172 struct sk_buff *skb;
173 u64 addr;
174
175 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
176 wr_id, wc->status);
177
178 if (unlikely(wr_id >= ipoib_recvq_size)) {
179 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
180 wr_id, ipoib_recvq_size);
181 return;
182 }
183
184 skb = priv->rx_ring[wr_id].skb;
185 addr = priv->rx_ring[wr_id].mapping;
186
187 if (unlikely(wc->status != IB_WC_SUCCESS)) {
188 if (wc->status != IB_WC_WR_FLUSH_ERR)
189 ipoib_warn(priv, "failed recv event "
190 "(status=%d, wrid=%d vend_err %x)\n",
191 wc->status, wr_id, wc->vendor_err);
192 ib_dma_unmap_single(priv->ca, addr,
193 IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
194 dev_kfree_skb_any(skb);
195 priv->rx_ring[wr_id].skb = NULL;
196 return;
197 }
198
199 /*
200 * Drop packets that this interface sent, ie multicast packets
201 * that the HCA has replicated.
202 */
203 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
204 goto repost;
205
206 /*
207 * If we can't allocate a new RX buffer, dump
208 * this packet and reuse the old buffer.
209 */
210 if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
211 ++dev->stats.rx_dropped;
212 goto repost;
213 }
214
215 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
216 wc->byte_len, wc->slid);
217
218 ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
219
220 skb_put(skb, wc->byte_len);
221 skb_pull(skb, IB_GRH_BYTES);
222
223 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
224 skb_reset_mac_header(skb);
225 skb_pull(skb, IPOIB_ENCAP_LEN);
226
227 dev->last_rx = jiffies;
228 ++dev->stats.rx_packets;
229 dev->stats.rx_bytes += skb->len;
230
231 skb->dev = dev;
232 /* XXX get correct PACKET_ type here */
233 skb->pkt_type = PACKET_HOST;
234 netif_receive_skb(skb);
235
236 repost:
237 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
238 ipoib_warn(priv, "ipoib_ib_post_receive failed "
239 "for buf %d\n", wr_id);
240 }
241
242 static int ipoib_dma_map_tx(struct ib_device *ca,
243 struct ipoib_tx_buf *tx_req)
244 {
245 struct sk_buff *skb = tx_req->skb;
246 u64 *mapping = tx_req->mapping;
247 int i;
248
249 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
250 DMA_TO_DEVICE);
251 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
252 return -EIO;
253
254 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
255 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
256 mapping[i + 1] = ib_dma_map_page(ca, frag->page,
257 frag->page_offset, frag->size,
258 DMA_TO_DEVICE);
259 if (unlikely(ib_dma_mapping_error(ca, mapping[i + 1])))
260 goto partial_error;
261 }
262 return 0;
263
264 partial_error:
265 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
266
267 for (; i > 0; --i) {
268 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
269 ib_dma_unmap_page(ca, mapping[i], frag->size, DMA_TO_DEVICE);
270 }
271 return -EIO;
272 }
273
274 static void ipoib_dma_unmap_tx(struct ib_device *ca,
275 struct ipoib_tx_buf *tx_req)
276 {
277 struct sk_buff *skb = tx_req->skb;
278 u64 *mapping = tx_req->mapping;
279 int i;
280
281 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
282
283 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
284 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
285 ib_dma_unmap_page(ca, mapping[i + 1], frag->size,
286 DMA_TO_DEVICE);
287 }
288 }
289
290 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
291 {
292 struct ipoib_dev_priv *priv = netdev_priv(dev);
293 unsigned int wr_id = wc->wr_id;
294 struct ipoib_tx_buf *tx_req;
295 unsigned long flags;
296
297 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
298 wr_id, wc->status);
299
300 if (unlikely(wr_id >= ipoib_sendq_size)) {
301 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
302 wr_id, ipoib_sendq_size);
303 return;
304 }
305
306 tx_req = &priv->tx_ring[wr_id];
307
308 ipoib_dma_unmap_tx(priv->ca, tx_req);
309
310 ++dev->stats.tx_packets;
311 dev->stats.tx_bytes += tx_req->skb->len;
312
313 dev_kfree_skb_any(tx_req->skb);
314
315 spin_lock_irqsave(&priv->tx_lock, flags);
316 ++priv->tx_tail;
317 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
318 netif_queue_stopped(dev) &&
319 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
320 netif_wake_queue(dev);
321 spin_unlock_irqrestore(&priv->tx_lock, flags);
322
323 if (wc->status != IB_WC_SUCCESS &&
324 wc->status != IB_WC_WR_FLUSH_ERR)
325 ipoib_warn(priv, "failed send event "
326 "(status=%d, wrid=%d vend_err %x)\n",
327 wc->status, wr_id, wc->vendor_err);
328 }
329
330 int ipoib_poll(struct napi_struct *napi, int budget)
331 {
332 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
333 struct net_device *dev = priv->dev;
334 int done;
335 int t;
336 int n, i;
337
338 done = 0;
339
340 poll_more:
341 while (done < budget) {
342 int max = (budget - done);
343
344 t = min(IPOIB_NUM_WC, max);
345 n = ib_poll_cq(priv->cq, t, priv->ibwc);
346
347 for (i = 0; i < n; i++) {
348 struct ib_wc *wc = priv->ibwc + i;
349
350 if (wc->wr_id & IPOIB_OP_RECV) {
351 ++done;
352 if (wc->wr_id & IPOIB_OP_CM)
353 ipoib_cm_handle_rx_wc(dev, wc);
354 else
355 ipoib_ib_handle_rx_wc(dev, wc);
356 } else {
357 if (wc->wr_id & IPOIB_OP_CM)
358 ipoib_cm_handle_tx_wc(dev, wc);
359 else
360 ipoib_ib_handle_tx_wc(dev, wc);
361 }
362 }
363
364 if (n != t)
365 break;
366 }
367
368 if (done < budget) {
369 netif_rx_complete(dev, napi);
370 if (unlikely(ib_req_notify_cq(priv->cq,
371 IB_CQ_NEXT_COMP |
372 IB_CQ_REPORT_MISSED_EVENTS)) &&
373 netif_rx_reschedule(dev, napi))
374 goto poll_more;
375 }
376
377 return done;
378 }
379
380 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
381 {
382 struct net_device *dev = dev_ptr;
383 struct ipoib_dev_priv *priv = netdev_priv(dev);
384
385 netif_rx_schedule(dev, &priv->napi);
386 }
387
388 static inline int post_send(struct ipoib_dev_priv *priv,
389 unsigned int wr_id,
390 struct ib_ah *address, u32 qpn,
391 u64 *mapping, int headlen,
392 skb_frag_t *frags,
393 int nr_frags)
394 {
395 struct ib_send_wr *bad_wr;
396 int i;
397
398 priv->tx_sge[0].addr = mapping[0];
399 priv->tx_sge[0].length = headlen;
400 for (i = 0; i < nr_frags; ++i) {
401 priv->tx_sge[i + 1].addr = mapping[i + 1];
402 priv->tx_sge[i + 1].length = frags[i].size;
403 }
404 priv->tx_wr.num_sge = nr_frags + 1;
405 priv->tx_wr.wr_id = wr_id;
406 priv->tx_wr.wr.ud.remote_qpn = qpn;
407 priv->tx_wr.wr.ud.ah = address;
408
409 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
410 }
411
412 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
413 struct ipoib_ah *address, u32 qpn)
414 {
415 struct ipoib_dev_priv *priv = netdev_priv(dev);
416 struct ipoib_tx_buf *tx_req;
417
418 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
419 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
420 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
421 ++dev->stats.tx_dropped;
422 ++dev->stats.tx_errors;
423 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
424 return;
425 }
426
427 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
428 skb->len, address, qpn);
429
430 /*
431 * We put the skb into the tx_ring _before_ we call post_send()
432 * because it's entirely possible that the completion handler will
433 * run before we execute anything after the post_send(). That
434 * means we have to make sure everything is properly recorded and
435 * our state is consistent before we call post_send().
436 */
437 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
438 tx_req->skb = skb;
439 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
440 ++dev->stats.tx_errors;
441 dev_kfree_skb_any(skb);
442 return;
443 }
444
445 if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
446 address->ah, qpn,
447 tx_req->mapping, skb_headlen(skb),
448 skb_shinfo(skb)->frags, skb_shinfo(skb)->nr_frags))) {
449 ipoib_warn(priv, "post_send failed\n");
450 ++dev->stats.tx_errors;
451 ipoib_dma_unmap_tx(priv->ca, tx_req);
452 dev_kfree_skb_any(skb);
453 } else {
454 dev->trans_start = jiffies;
455
456 address->last_send = priv->tx_head;
457 ++priv->tx_head;
458
459 if (++priv->tx_outstanding == ipoib_sendq_size) {
460 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
461 netif_stop_queue(dev);
462 }
463 }
464 }
465
466 static void __ipoib_reap_ah(struct net_device *dev)
467 {
468 struct ipoib_dev_priv *priv = netdev_priv(dev);
469 struct ipoib_ah *ah, *tah;
470 LIST_HEAD(remove_list);
471
472 spin_lock_irq(&priv->tx_lock);
473 spin_lock(&priv->lock);
474 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
475 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
476 list_del(&ah->list);
477 ib_destroy_ah(ah->ah);
478 kfree(ah);
479 }
480 spin_unlock(&priv->lock);
481 spin_unlock_irq(&priv->tx_lock);
482 }
483
484 void ipoib_reap_ah(struct work_struct *work)
485 {
486 struct ipoib_dev_priv *priv =
487 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
488 struct net_device *dev = priv->dev;
489
490 __ipoib_reap_ah(dev);
491
492 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
493 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
494 round_jiffies_relative(HZ));
495 }
496
497 int ipoib_ib_dev_open(struct net_device *dev)
498 {
499 struct ipoib_dev_priv *priv = netdev_priv(dev);
500 int ret;
501
502 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
503 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
504 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
505 return -1;
506 }
507 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
508
509 ret = ipoib_init_qp(dev);
510 if (ret) {
511 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
512 return -1;
513 }
514
515 ret = ipoib_ib_post_receives(dev);
516 if (ret) {
517 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
518 ipoib_ib_dev_stop(dev, 1);
519 return -1;
520 }
521
522 ret = ipoib_cm_dev_open(dev);
523 if (ret) {
524 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
525 ipoib_ib_dev_stop(dev, 1);
526 return -1;
527 }
528
529 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
530 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
531 round_jiffies_relative(HZ));
532
533 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
534
535 return 0;
536 }
537
538 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
539 {
540 struct ipoib_dev_priv *priv = netdev_priv(dev);
541 u16 pkey_index = 0;
542
543 if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
544 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
545 else
546 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
547 }
548
549 int ipoib_ib_dev_up(struct net_device *dev)
550 {
551 struct ipoib_dev_priv *priv = netdev_priv(dev);
552
553 ipoib_pkey_dev_check_presence(dev);
554
555 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
556 ipoib_dbg(priv, "PKEY is not assigned.\n");
557 return 0;
558 }
559
560 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
561
562 return ipoib_mcast_start_thread(dev);
563 }
564
565 int ipoib_ib_dev_down(struct net_device *dev, int flush)
566 {
567 struct ipoib_dev_priv *priv = netdev_priv(dev);
568
569 ipoib_dbg(priv, "downing ib_dev\n");
570
571 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
572 netif_carrier_off(dev);
573
574 /* Shutdown the P_Key thread if still active */
575 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
576 mutex_lock(&pkey_mutex);
577 set_bit(IPOIB_PKEY_STOP, &priv->flags);
578 cancel_delayed_work(&priv->pkey_poll_task);
579 mutex_unlock(&pkey_mutex);
580 if (flush)
581 flush_workqueue(ipoib_workqueue);
582 }
583
584 ipoib_mcast_stop_thread(dev, flush);
585 ipoib_mcast_dev_flush(dev);
586
587 ipoib_flush_paths(dev);
588
589 return 0;
590 }
591
592 static int recvs_pending(struct net_device *dev)
593 {
594 struct ipoib_dev_priv *priv = netdev_priv(dev);
595 int pending = 0;
596 int i;
597
598 for (i = 0; i < ipoib_recvq_size; ++i)
599 if (priv->rx_ring[i].skb)
600 ++pending;
601
602 return pending;
603 }
604
605 void ipoib_drain_cq(struct net_device *dev)
606 {
607 struct ipoib_dev_priv *priv = netdev_priv(dev);
608 int i, n;
609 do {
610 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
611 for (i = 0; i < n; ++i) {
612 /*
613 * Convert any successful completions to flush
614 * errors to avoid passing packets up the
615 * stack after bringing the device down.
616 */
617 if (priv->ibwc[i].status == IB_WC_SUCCESS)
618 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
619
620 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
621 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
622 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
623 else
624 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
625 } else {
626 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
627 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
628 else
629 ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
630 }
631 }
632 } while (n == IPOIB_NUM_WC);
633 }
634
635 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
636 {
637 struct ipoib_dev_priv *priv = netdev_priv(dev);
638 struct ib_qp_attr qp_attr;
639 unsigned long begin;
640 struct ipoib_tx_buf *tx_req;
641 int i;
642
643 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
644
645 ipoib_cm_dev_stop(dev);
646
647 /*
648 * Move our QP to the error state and then reinitialize in
649 * when all work requests have completed or have been flushed.
650 */
651 qp_attr.qp_state = IB_QPS_ERR;
652 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
653 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
654
655 /* Wait for all sends and receives to complete */
656 begin = jiffies;
657
658 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
659 if (time_after(jiffies, begin + 5 * HZ)) {
660 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
661 priv->tx_head - priv->tx_tail, recvs_pending(dev));
662
663 /*
664 * assume the HW is wedged and just free up
665 * all our pending work requests.
666 */
667 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
668 tx_req = &priv->tx_ring[priv->tx_tail &
669 (ipoib_sendq_size - 1)];
670 ipoib_dma_unmap_tx(priv->ca, tx_req);
671 dev_kfree_skb_any(tx_req->skb);
672 ++priv->tx_tail;
673 --priv->tx_outstanding;
674 }
675
676 for (i = 0; i < ipoib_recvq_size; ++i) {
677 struct ipoib_rx_buf *rx_req;
678
679 rx_req = &priv->rx_ring[i];
680 if (!rx_req->skb)
681 continue;
682 ib_dma_unmap_single(priv->ca,
683 rx_req->mapping,
684 IPOIB_BUF_SIZE,
685 DMA_FROM_DEVICE);
686 dev_kfree_skb_any(rx_req->skb);
687 rx_req->skb = NULL;
688 }
689
690 goto timeout;
691 }
692
693 ipoib_drain_cq(dev);
694
695 msleep(1);
696 }
697
698 ipoib_dbg(priv, "All sends and receives done.\n");
699
700 timeout:
701 qp_attr.qp_state = IB_QPS_RESET;
702 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
703 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
704
705 /* Wait for all AHs to be reaped */
706 set_bit(IPOIB_STOP_REAPER, &priv->flags);
707 cancel_delayed_work(&priv->ah_reap_task);
708 if (flush)
709 flush_workqueue(ipoib_workqueue);
710
711 begin = jiffies;
712
713 while (!list_empty(&priv->dead_ahs)) {
714 __ipoib_reap_ah(dev);
715
716 if (time_after(jiffies, begin + HZ)) {
717 ipoib_warn(priv, "timing out; will leak address handles\n");
718 break;
719 }
720
721 msleep(1);
722 }
723
724 ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
725
726 return 0;
727 }
728
729 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
730 {
731 struct ipoib_dev_priv *priv = netdev_priv(dev);
732
733 priv->ca = ca;
734 priv->port = port;
735 priv->qp = NULL;
736
737 if (ipoib_transport_dev_init(dev, ca)) {
738 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
739 return -ENODEV;
740 }
741
742 if (dev->flags & IFF_UP) {
743 if (ipoib_ib_dev_open(dev)) {
744 ipoib_transport_dev_cleanup(dev);
745 return -ENODEV;
746 }
747 }
748
749 return 0;
750 }
751
752 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
753 {
754 struct ipoib_dev_priv *cpriv;
755 struct net_device *dev = priv->dev;
756 u16 new_index;
757
758 mutex_lock(&priv->vlan_mutex);
759
760 /*
761 * Flush any child interfaces too -- they might be up even if
762 * the parent is down.
763 */
764 list_for_each_entry(cpriv, &priv->child_intfs, list)
765 __ipoib_ib_dev_flush(cpriv, pkey_event);
766
767 mutex_unlock(&priv->vlan_mutex);
768
769 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
770 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
771 return;
772 }
773
774 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
775 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
776 return;
777 }
778
779 if (pkey_event) {
780 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
781 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
782 ipoib_ib_dev_down(dev, 0);
783 ipoib_ib_dev_stop(dev, 0);
784 ipoib_pkey_dev_delay_open(dev);
785 return;
786 }
787 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
788
789 /* restart QP only if P_Key index is changed */
790 if (new_index == priv->pkey_index) {
791 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
792 return;
793 }
794 priv->pkey_index = new_index;
795 }
796
797 ipoib_dbg(priv, "flushing\n");
798
799 ipoib_ib_dev_down(dev, 0);
800
801 if (pkey_event) {
802 ipoib_ib_dev_stop(dev, 0);
803 ipoib_ib_dev_open(dev);
804 }
805
806 /*
807 * The device could have been brought down between the start and when
808 * we get here, don't bring it back up if it's not configured up
809 */
810 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
811 ipoib_ib_dev_up(dev);
812 ipoib_mcast_restart_task(&priv->restart_task);
813 }
814 }
815
816 void ipoib_ib_dev_flush(struct work_struct *work)
817 {
818 struct ipoib_dev_priv *priv =
819 container_of(work, struct ipoib_dev_priv, flush_task);
820
821 ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
822 __ipoib_ib_dev_flush(priv, 0);
823 }
824
825 void ipoib_pkey_event(struct work_struct *work)
826 {
827 struct ipoib_dev_priv *priv =
828 container_of(work, struct ipoib_dev_priv, pkey_event_task);
829
830 ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
831 __ipoib_ib_dev_flush(priv, 1);
832 }
833
834 void ipoib_ib_dev_cleanup(struct net_device *dev)
835 {
836 struct ipoib_dev_priv *priv = netdev_priv(dev);
837
838 ipoib_dbg(priv, "cleaning up ib_dev\n");
839
840 ipoib_mcast_stop_thread(dev, 1);
841 ipoib_mcast_dev_flush(dev);
842
843 ipoib_transport_dev_cleanup(dev);
844 }
845
846 /*
847 * Delayed P_Key Assigment Interim Support
848 *
849 * The following is initial implementation of delayed P_Key assigment
850 * mechanism. It is using the same approach implemented for the multicast
851 * group join. The single goal of this implementation is to quickly address
852 * Bug #2507. This implementation will probably be removed when the P_Key
853 * change async notification is available.
854 */
855
856 void ipoib_pkey_poll(struct work_struct *work)
857 {
858 struct ipoib_dev_priv *priv =
859 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
860 struct net_device *dev = priv->dev;
861
862 ipoib_pkey_dev_check_presence(dev);
863
864 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
865 ipoib_open(dev);
866 else {
867 mutex_lock(&pkey_mutex);
868 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
869 queue_delayed_work(ipoib_workqueue,
870 &priv->pkey_poll_task,
871 HZ);
872 mutex_unlock(&pkey_mutex);
873 }
874 }
875
876 int ipoib_pkey_dev_delay_open(struct net_device *dev)
877 {
878 struct ipoib_dev_priv *priv = netdev_priv(dev);
879
880 /* Look for the interface pkey value in the IB Port P_Key table and */
881 /* set the interface pkey assigment flag */
882 ipoib_pkey_dev_check_presence(dev);
883
884 /* P_Key value not assigned yet - start polling */
885 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
886 mutex_lock(&pkey_mutex);
887 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
888 queue_delayed_work(ipoib_workqueue,
889 &priv->pkey_poll_task,
890 HZ);
891 mutex_unlock(&pkey_mutex);
892 return 1;
893 }
894
895 return 0;
896 }
WRT350N Kernel Patches