Merge branch 'upstream-jeff' of git://git.kernel.org/pub/scm/linux/kernel/git/romieu...
[linux-2.6] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
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 void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
243 {
244         struct ipoib_dev_priv *priv = netdev_priv(dev);
245         unsigned int wr_id = wc->wr_id;
246         struct ipoib_tx_buf *tx_req;
247         unsigned long flags;
248
249         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
250                        wr_id, wc->status);
251
252         if (unlikely(wr_id >= ipoib_sendq_size)) {
253                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
254                            wr_id, ipoib_sendq_size);
255                 return;
256         }
257
258         tx_req = &priv->tx_ring[wr_id];
259
260         ib_dma_unmap_single(priv->ca, tx_req->mapping,
261                             tx_req->skb->len, DMA_TO_DEVICE);
262
263         ++dev->stats.tx_packets;
264         dev->stats.tx_bytes += tx_req->skb->len;
265
266         dev_kfree_skb_any(tx_req->skb);
267
268         spin_lock_irqsave(&priv->tx_lock, flags);
269         ++priv->tx_tail;
270         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
271             netif_queue_stopped(dev) &&
272             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
273                 netif_wake_queue(dev);
274         spin_unlock_irqrestore(&priv->tx_lock, flags);
275
276         if (wc->status != IB_WC_SUCCESS &&
277             wc->status != IB_WC_WR_FLUSH_ERR)
278                 ipoib_warn(priv, "failed send event "
279                            "(status=%d, wrid=%d vend_err %x)\n",
280                            wc->status, wr_id, wc->vendor_err);
281 }
282
283 int ipoib_poll(struct napi_struct *napi, int budget)
284 {
285         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
286         struct net_device *dev = priv->dev;
287         int done;
288         int t;
289         int n, i;
290
291         done  = 0;
292
293 poll_more:
294         while (done < budget) {
295                 int max = (budget - done);
296
297                 t = min(IPOIB_NUM_WC, max);
298                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
299
300                 for (i = 0; i < n; i++) {
301                         struct ib_wc *wc = priv->ibwc + i;
302
303                         if (wc->wr_id & IPOIB_OP_RECV) {
304                                 ++done;
305                                 if (wc->wr_id & IPOIB_OP_CM)
306                                         ipoib_cm_handle_rx_wc(dev, wc);
307                                 else
308                                         ipoib_ib_handle_rx_wc(dev, wc);
309                         } else {
310                                 if (wc->wr_id & IPOIB_OP_CM)
311                                         ipoib_cm_handle_tx_wc(dev, wc);
312                                 else
313                                         ipoib_ib_handle_tx_wc(dev, wc);
314                         }
315                 }
316
317                 if (n != t)
318                         break;
319         }
320
321         if (done < budget) {
322                 netif_rx_complete(dev, napi);
323                 if (unlikely(ib_req_notify_cq(priv->cq,
324                                               IB_CQ_NEXT_COMP |
325                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
326                     netif_rx_reschedule(dev, napi))
327                         goto poll_more;
328         }
329
330         return done;
331 }
332
333 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
334 {
335         struct net_device *dev = dev_ptr;
336         struct ipoib_dev_priv *priv = netdev_priv(dev);
337
338         netif_rx_schedule(dev, &priv->napi);
339 }
340
341 static inline int post_send(struct ipoib_dev_priv *priv,
342                             unsigned int wr_id,
343                             struct ib_ah *address, u32 qpn,
344                             u64 addr, int len)
345 {
346         struct ib_send_wr *bad_wr;
347
348         priv->tx_sge.addr             = addr;
349         priv->tx_sge.length           = len;
350
351         priv->tx_wr.wr_id             = wr_id;
352         priv->tx_wr.wr.ud.remote_qpn  = qpn;
353         priv->tx_wr.wr.ud.ah          = address;
354
355         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
356 }
357
358 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
359                 struct ipoib_ah *address, u32 qpn)
360 {
361         struct ipoib_dev_priv *priv = netdev_priv(dev);
362         struct ipoib_tx_buf *tx_req;
363         u64 addr;
364
365         if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
366                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
367                            skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
368                 ++dev->stats.tx_dropped;
369                 ++dev->stats.tx_errors;
370                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
371                 return;
372         }
373
374         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
375                        skb->len, address, qpn);
376
377         /*
378          * We put the skb into the tx_ring _before_ we call post_send()
379          * because it's entirely possible that the completion handler will
380          * run before we execute anything after the post_send().  That
381          * means we have to make sure everything is properly recorded and
382          * our state is consistent before we call post_send().
383          */
384         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
385         tx_req->skb = skb;
386         addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
387                                  DMA_TO_DEVICE);
388         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
389                 ++dev->stats.tx_errors;
390                 dev_kfree_skb_any(skb);
391                 return;
392         }
393         tx_req->mapping = addr;
394
395         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
396                                address->ah, qpn, addr, skb->len))) {
397                 ipoib_warn(priv, "post_send failed\n");
398                 ++dev->stats.tx_errors;
399                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
400                 dev_kfree_skb_any(skb);
401         } else {
402                 dev->trans_start = jiffies;
403
404                 address->last_send = priv->tx_head;
405                 ++priv->tx_head;
406
407                 if (++priv->tx_outstanding == ipoib_sendq_size) {
408                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
409                         netif_stop_queue(dev);
410                 }
411         }
412 }
413
414 static void __ipoib_reap_ah(struct net_device *dev)
415 {
416         struct ipoib_dev_priv *priv = netdev_priv(dev);
417         struct ipoib_ah *ah, *tah;
418         LIST_HEAD(remove_list);
419
420         spin_lock_irq(&priv->tx_lock);
421         spin_lock(&priv->lock);
422         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
423                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
424                         list_del(&ah->list);
425                         ib_destroy_ah(ah->ah);
426                         kfree(ah);
427                 }
428         spin_unlock(&priv->lock);
429         spin_unlock_irq(&priv->tx_lock);
430 }
431
432 void ipoib_reap_ah(struct work_struct *work)
433 {
434         struct ipoib_dev_priv *priv =
435                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
436         struct net_device *dev = priv->dev;
437
438         __ipoib_reap_ah(dev);
439
440         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
441                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
442                                    round_jiffies_relative(HZ));
443 }
444
445 int ipoib_ib_dev_open(struct net_device *dev)
446 {
447         struct ipoib_dev_priv *priv = netdev_priv(dev);
448         int ret;
449
450         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
451                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
452                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
453                 return -1;
454         }
455         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
456
457         ret = ipoib_init_qp(dev);
458         if (ret) {
459                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
460                 return -1;
461         }
462
463         ret = ipoib_ib_post_receives(dev);
464         if (ret) {
465                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
466                 ipoib_ib_dev_stop(dev, 1);
467                 return -1;
468         }
469
470         ret = ipoib_cm_dev_open(dev);
471         if (ret) {
472                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
473                 ipoib_ib_dev_stop(dev, 1);
474                 return -1;
475         }
476
477         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
478         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
479                            round_jiffies_relative(HZ));
480
481         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
482
483         return 0;
484 }
485
486 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
487 {
488         struct ipoib_dev_priv *priv = netdev_priv(dev);
489         u16 pkey_index = 0;
490
491         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
492                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
493         else
494                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
495 }
496
497 int ipoib_ib_dev_up(struct net_device *dev)
498 {
499         struct ipoib_dev_priv *priv = netdev_priv(dev);
500
501         ipoib_pkey_dev_check_presence(dev);
502
503         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
504                 ipoib_dbg(priv, "PKEY is not assigned.\n");
505                 return 0;
506         }
507
508         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
509
510         return ipoib_mcast_start_thread(dev);
511 }
512
513 int ipoib_ib_dev_down(struct net_device *dev, int flush)
514 {
515         struct ipoib_dev_priv *priv = netdev_priv(dev);
516
517         ipoib_dbg(priv, "downing ib_dev\n");
518
519         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
520         netif_carrier_off(dev);
521
522         /* Shutdown the P_Key thread if still active */
523         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
524                 mutex_lock(&pkey_mutex);
525                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
526                 cancel_delayed_work(&priv->pkey_poll_task);
527                 mutex_unlock(&pkey_mutex);
528                 if (flush)
529                         flush_workqueue(ipoib_workqueue);
530         }
531
532         ipoib_mcast_stop_thread(dev, flush);
533         ipoib_mcast_dev_flush(dev);
534
535         ipoib_flush_paths(dev);
536
537         return 0;
538 }
539
540 static int recvs_pending(struct net_device *dev)
541 {
542         struct ipoib_dev_priv *priv = netdev_priv(dev);
543         int pending = 0;
544         int i;
545
546         for (i = 0; i < ipoib_recvq_size; ++i)
547                 if (priv->rx_ring[i].skb)
548                         ++pending;
549
550         return pending;
551 }
552
553 void ipoib_drain_cq(struct net_device *dev)
554 {
555         struct ipoib_dev_priv *priv = netdev_priv(dev);
556         int i, n;
557         do {
558                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
559                 for (i = 0; i < n; ++i) {
560                         /*
561                          * Convert any successful completions to flush
562                          * errors to avoid passing packets up the
563                          * stack after bringing the device down.
564                          */
565                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
566                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
567
568                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
569                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
570                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
571                                 else
572                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
573                         } else {
574                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
575                                         ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
576                                 else
577                                         ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
578                         }
579                 }
580         } while (n == IPOIB_NUM_WC);
581 }
582
583 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
584 {
585         struct ipoib_dev_priv *priv = netdev_priv(dev);
586         struct ib_qp_attr qp_attr;
587         unsigned long begin;
588         struct ipoib_tx_buf *tx_req;
589         int i;
590
591         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
592
593         ipoib_cm_dev_stop(dev);
594
595         /*
596          * Move our QP to the error state and then reinitialize in
597          * when all work requests have completed or have been flushed.
598          */
599         qp_attr.qp_state = IB_QPS_ERR;
600         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
601                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
602
603         /* Wait for all sends and receives to complete */
604         begin = jiffies;
605
606         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
607                 if (time_after(jiffies, begin + 5 * HZ)) {
608                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
609                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
610
611                         /*
612                          * assume the HW is wedged and just free up
613                          * all our pending work requests.
614                          */
615                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
616                                 tx_req = &priv->tx_ring[priv->tx_tail &
617                                                         (ipoib_sendq_size - 1)];
618                                 ib_dma_unmap_single(priv->ca,
619                                                     tx_req->mapping,
620                                                     tx_req->skb->len,
621                                                     DMA_TO_DEVICE);
622                                 dev_kfree_skb_any(tx_req->skb);
623                                 ++priv->tx_tail;
624                                 --priv->tx_outstanding;
625                         }
626
627                         for (i = 0; i < ipoib_recvq_size; ++i) {
628                                 struct ipoib_rx_buf *rx_req;
629
630                                 rx_req = &priv->rx_ring[i];
631                                 if (!rx_req->skb)
632                                         continue;
633                                 ib_dma_unmap_single(priv->ca,
634                                                     rx_req->mapping,
635                                                     IPOIB_BUF_SIZE,
636                                                     DMA_FROM_DEVICE);
637                                 dev_kfree_skb_any(rx_req->skb);
638                                 rx_req->skb = NULL;
639                         }
640
641                         goto timeout;
642                 }
643
644                 ipoib_drain_cq(dev);
645
646                 msleep(1);
647         }
648
649         ipoib_dbg(priv, "All sends and receives done.\n");
650
651 timeout:
652         qp_attr.qp_state = IB_QPS_RESET;
653         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
654                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
655
656         /* Wait for all AHs to be reaped */
657         set_bit(IPOIB_STOP_REAPER, &priv->flags);
658         cancel_delayed_work(&priv->ah_reap_task);
659         if (flush)
660                 flush_workqueue(ipoib_workqueue);
661
662         begin = jiffies;
663
664         while (!list_empty(&priv->dead_ahs)) {
665                 __ipoib_reap_ah(dev);
666
667                 if (time_after(jiffies, begin + HZ)) {
668                         ipoib_warn(priv, "timing out; will leak address handles\n");
669                         break;
670                 }
671
672                 msleep(1);
673         }
674
675         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
676
677         return 0;
678 }
679
680 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
681 {
682         struct ipoib_dev_priv *priv = netdev_priv(dev);
683
684         priv->ca = ca;
685         priv->port = port;
686         priv->qp = NULL;
687
688         if (ipoib_transport_dev_init(dev, ca)) {
689                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
690                 return -ENODEV;
691         }
692
693         if (dev->flags & IFF_UP) {
694                 if (ipoib_ib_dev_open(dev)) {
695                         ipoib_transport_dev_cleanup(dev);
696                         return -ENODEV;
697                 }
698         }
699
700         return 0;
701 }
702
703 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
704 {
705         struct ipoib_dev_priv *cpriv;
706         struct net_device *dev = priv->dev;
707         u16 new_index;
708
709         mutex_lock(&priv->vlan_mutex);
710
711         /*
712          * Flush any child interfaces too -- they might be up even if
713          * the parent is down.
714          */
715         list_for_each_entry(cpriv, &priv->child_intfs, list)
716                 __ipoib_ib_dev_flush(cpriv, pkey_event);
717
718         mutex_unlock(&priv->vlan_mutex);
719
720         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
721                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
722                 return;
723         }
724
725         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
726                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
727                 return;
728         }
729
730         if (pkey_event) {
731                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
732                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
733                         ipoib_ib_dev_down(dev, 0);
734                         ipoib_pkey_dev_delay_open(dev);
735                         return;
736                 }
737                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
738
739                 /* restart QP only if P_Key index is changed */
740                 if (new_index == priv->pkey_index) {
741                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
742                         return;
743                 }
744                 priv->pkey_index = new_index;
745         }
746
747         ipoib_dbg(priv, "flushing\n");
748
749         ipoib_ib_dev_down(dev, 0);
750
751         if (pkey_event) {
752                 ipoib_ib_dev_stop(dev, 0);
753                 ipoib_ib_dev_open(dev);
754         }
755
756         /*
757          * The device could have been brought down between the start and when
758          * we get here, don't bring it back up if it's not configured up
759          */
760         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
761                 ipoib_ib_dev_up(dev);
762                 ipoib_mcast_restart_task(&priv->restart_task);
763         }
764 }
765
766 void ipoib_ib_dev_flush(struct work_struct *work)
767 {
768         struct ipoib_dev_priv *priv =
769                 container_of(work, struct ipoib_dev_priv, flush_task);
770
771         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
772         __ipoib_ib_dev_flush(priv, 0);
773 }
774
775 void ipoib_pkey_event(struct work_struct *work)
776 {
777         struct ipoib_dev_priv *priv =
778                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
779
780         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
781         __ipoib_ib_dev_flush(priv, 1);
782 }
783
784 void ipoib_ib_dev_cleanup(struct net_device *dev)
785 {
786         struct ipoib_dev_priv *priv = netdev_priv(dev);
787
788         ipoib_dbg(priv, "cleaning up ib_dev\n");
789
790         ipoib_mcast_stop_thread(dev, 1);
791         ipoib_mcast_dev_flush(dev);
792
793         ipoib_transport_dev_cleanup(dev);
794 }
795
796 /*
797  * Delayed P_Key Assigment Interim Support
798  *
799  * The following is initial implementation of delayed P_Key assigment
800  * mechanism. It is using the same approach implemented for the multicast
801  * group join. The single goal of this implementation is to quickly address
802  * Bug #2507. This implementation will probably be removed when the P_Key
803  * change async notification is available.
804  */
805
806 void ipoib_pkey_poll(struct work_struct *work)
807 {
808         struct ipoib_dev_priv *priv =
809                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
810         struct net_device *dev = priv->dev;
811
812         ipoib_pkey_dev_check_presence(dev);
813
814         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
815                 ipoib_open(dev);
816         else {
817                 mutex_lock(&pkey_mutex);
818                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
819                         queue_delayed_work(ipoib_workqueue,
820                                            &priv->pkey_poll_task,
821                                            HZ);
822                 mutex_unlock(&pkey_mutex);
823         }
824 }
825
826 int ipoib_pkey_dev_delay_open(struct net_device *dev)
827 {
828         struct ipoib_dev_priv *priv = netdev_priv(dev);
829
830         /* Look for the interface pkey value in the IB Port P_Key table and */
831         /* set the interface pkey assigment flag                            */
832         ipoib_pkey_dev_check_presence(dev);
833
834         /* P_Key value not assigned yet - start polling */
835         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
836                 mutex_lock(&pkey_mutex);
837                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
838                 queue_delayed_work(ipoib_workqueue,
839                                    &priv->pkey_poll_task,
840                                    HZ);
841                 mutex_unlock(&pkey_mutex);
842                 return 1;
843         }
844
845         return 0;
846 }