Merge branch 'juju' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux13...
[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          * If we can't allocate a new RX buffer, dump
201          * this packet and reuse the old buffer.
202          */
203         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
204                 ++priv->stats.rx_dropped;
205                 goto repost;
206         }
207
208         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
209                        wc->byte_len, wc->slid);
210
211         ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
212
213         skb_put(skb, wc->byte_len);
214         skb_pull(skb, IB_GRH_BYTES);
215
216         if (wc->slid != priv->local_lid ||
217             wc->src_qp != priv->qp->qp_num) {
218                 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
219                 skb_reset_mac_header(skb);
220                 skb_pull(skb, IPOIB_ENCAP_LEN);
221
222                 dev->last_rx = jiffies;
223                 ++priv->stats.rx_packets;
224                 priv->stats.rx_bytes += skb->len;
225
226                 skb->dev = dev;
227                 /* XXX get correct PACKET_ type here */
228                 skb->pkt_type = PACKET_HOST;
229                 netif_receive_skb(skb);
230         } else {
231                 ipoib_dbg_data(priv, "dropping loopback packet\n");
232                 dev_kfree_skb_any(skb);
233         }
234
235 repost:
236         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
237                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
238                            "for buf %d\n", wr_id);
239 }
240
241 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
242 {
243         struct ipoib_dev_priv *priv = netdev_priv(dev);
244         unsigned int wr_id = wc->wr_id;
245         struct ipoib_tx_buf *tx_req;
246         unsigned long flags;
247
248         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
249                        wr_id, wc->status);
250
251         if (unlikely(wr_id >= ipoib_sendq_size)) {
252                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
253                            wr_id, ipoib_sendq_size);
254                 return;
255         }
256
257         tx_req = &priv->tx_ring[wr_id];
258
259         ib_dma_unmap_single(priv->ca, tx_req->mapping,
260                             tx_req->skb->len, DMA_TO_DEVICE);
261
262         ++priv->stats.tx_packets;
263         priv->stats.tx_bytes += tx_req->skb->len;
264
265         dev_kfree_skb_any(tx_req->skb);
266
267         spin_lock_irqsave(&priv->tx_lock, flags);
268         ++priv->tx_tail;
269         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags)) &&
270             priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1) {
271                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
272                 netif_wake_queue(dev);
273         }
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 net_device *dev, int *budget)
284 {
285         struct ipoib_dev_priv *priv = netdev_priv(dev);
286         int max = min(*budget, dev->quota);
287         int done;
288         int t;
289         int empty;
290         int n, i;
291
292         done  = 0;
293         empty = 0;
294
295         while (max) {
296                 t = min(IPOIB_NUM_WC, max);
297                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
298
299                 for (i = 0; i < n; ++i) {
300                         struct ib_wc *wc = priv->ibwc + i;
301
302                         if (wc->wr_id & IPOIB_CM_OP_SRQ) {
303                                 ++done;
304                                 --max;
305                                 ipoib_cm_handle_rx_wc(dev, wc);
306                         } else if (wc->wr_id & IPOIB_OP_RECV) {
307                                 ++done;
308                                 --max;
309                                 ipoib_ib_handle_rx_wc(dev, wc);
310                         } else
311                                 ipoib_ib_handle_tx_wc(dev, wc);
312                 }
313
314                 if (n != t) {
315                         empty = 1;
316                         break;
317                 }
318         }
319
320         dev->quota -= done;
321         *budget    -= done;
322
323         if (empty) {
324                 netif_rx_complete(dev);
325                 if (unlikely(ib_req_notify_cq(priv->cq,
326                                               IB_CQ_NEXT_COMP |
327                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
328                     netif_rx_reschedule(dev, 0))
329                         return 1;
330
331                 return 0;
332         }
333
334         return 1;
335 }
336
337 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
338 {
339         netif_rx_schedule(dev_ptr);
340 }
341
342 static inline int post_send(struct ipoib_dev_priv *priv,
343                             unsigned int wr_id,
344                             struct ib_ah *address, u32 qpn,
345                             u64 addr, int len)
346 {
347         struct ib_send_wr *bad_wr;
348
349         priv->tx_sge.addr             = addr;
350         priv->tx_sge.length           = len;
351
352         priv->tx_wr.wr_id             = wr_id;
353         priv->tx_wr.wr.ud.remote_qpn  = qpn;
354         priv->tx_wr.wr.ud.ah          = address;
355
356         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
357 }
358
359 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
360                 struct ipoib_ah *address, u32 qpn)
361 {
362         struct ipoib_dev_priv *priv = netdev_priv(dev);
363         struct ipoib_tx_buf *tx_req;
364         u64 addr;
365
366         if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
367                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
368                            skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
369                 ++priv->stats.tx_dropped;
370                 ++priv->stats.tx_errors;
371                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
372                 return;
373         }
374
375         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
376                        skb->len, address, qpn);
377
378         /*
379          * We put the skb into the tx_ring _before_ we call post_send()
380          * because it's entirely possible that the completion handler will
381          * run before we execute anything after the post_send().  That
382          * means we have to make sure everything is properly recorded and
383          * our state is consistent before we call post_send().
384          */
385         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
386         tx_req->skb = skb;
387         addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
388                                  DMA_TO_DEVICE);
389         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
390                 ++priv->stats.tx_errors;
391                 dev_kfree_skb_any(skb);
392                 return;
393         }
394         tx_req->mapping = addr;
395
396         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
397                                address->ah, qpn, addr, skb->len))) {
398                 ipoib_warn(priv, "post_send failed\n");
399                 ++priv->stats.tx_errors;
400                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
401                 dev_kfree_skb_any(skb);
402         } else {
403                 dev->trans_start = jiffies;
404
405                 address->last_send = priv->tx_head;
406                 ++priv->tx_head;
407
408                 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
409                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
410                         netif_stop_queue(dev);
411                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
412                 }
413         }
414 }
415
416 static void __ipoib_reap_ah(struct net_device *dev)
417 {
418         struct ipoib_dev_priv *priv = netdev_priv(dev);
419         struct ipoib_ah *ah, *tah;
420         LIST_HEAD(remove_list);
421
422         spin_lock_irq(&priv->tx_lock);
423         spin_lock(&priv->lock);
424         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
425                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
426                         list_del(&ah->list);
427                         ib_destroy_ah(ah->ah);
428                         kfree(ah);
429                 }
430         spin_unlock(&priv->lock);
431         spin_unlock_irq(&priv->tx_lock);
432 }
433
434 void ipoib_reap_ah(struct work_struct *work)
435 {
436         struct ipoib_dev_priv *priv =
437                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
438         struct net_device *dev = priv->dev;
439
440         __ipoib_reap_ah(dev);
441
442         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
443                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
444 }
445
446 int ipoib_ib_dev_open(struct net_device *dev)
447 {
448         struct ipoib_dev_priv *priv = netdev_priv(dev);
449         int ret;
450
451         ret = ipoib_init_qp(dev);
452         if (ret) {
453                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
454                 return -1;
455         }
456
457         ret = ipoib_ib_post_receives(dev);
458         if (ret) {
459                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
460                 ipoib_ib_dev_stop(dev);
461                 return -1;
462         }
463
464         ret = ipoib_cm_dev_open(dev);
465         if (ret) {
466                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
467                 ipoib_ib_dev_stop(dev);
468                 return -1;
469         }
470
471         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
472         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
473
474         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
475
476         return 0;
477 }
478
479 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
480 {
481         struct ipoib_dev_priv *priv = netdev_priv(dev);
482         u16 pkey_index = 0;
483
484         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
485                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
486         else
487                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
488 }
489
490 int ipoib_ib_dev_up(struct net_device *dev)
491 {
492         struct ipoib_dev_priv *priv = netdev_priv(dev);
493
494         ipoib_pkey_dev_check_presence(dev);
495
496         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
497                 ipoib_dbg(priv, "PKEY is not assigned.\n");
498                 return 0;
499         }
500
501         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
502
503         return ipoib_mcast_start_thread(dev);
504 }
505
506 int ipoib_ib_dev_down(struct net_device *dev, int flush)
507 {
508         struct ipoib_dev_priv *priv = netdev_priv(dev);
509
510         ipoib_dbg(priv, "downing ib_dev\n");
511
512         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
513         netif_carrier_off(dev);
514
515         /* Shutdown the P_Key thread if still active */
516         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
517                 mutex_lock(&pkey_mutex);
518                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
519                 cancel_delayed_work(&priv->pkey_task);
520                 mutex_unlock(&pkey_mutex);
521                 if (flush)
522                         flush_workqueue(ipoib_workqueue);
523         }
524
525         ipoib_mcast_stop_thread(dev, flush);
526         ipoib_mcast_dev_flush(dev);
527
528         ipoib_flush_paths(dev);
529
530         return 0;
531 }
532
533 static int recvs_pending(struct net_device *dev)
534 {
535         struct ipoib_dev_priv *priv = netdev_priv(dev);
536         int pending = 0;
537         int i;
538
539         for (i = 0; i < ipoib_recvq_size; ++i)
540                 if (priv->rx_ring[i].skb)
541                         ++pending;
542
543         return pending;
544 }
545
546 int ipoib_ib_dev_stop(struct net_device *dev)
547 {
548         struct ipoib_dev_priv *priv = netdev_priv(dev);
549         struct ib_qp_attr qp_attr;
550         unsigned long begin;
551         struct ipoib_tx_buf *tx_req;
552         int i, n;
553
554         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
555         netif_poll_disable(dev);
556
557         ipoib_cm_dev_stop(dev);
558
559         /*
560          * Move our QP to the error state and then reinitialize in
561          * when all work requests have completed or have been flushed.
562          */
563         qp_attr.qp_state = IB_QPS_ERR;
564         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
565                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
566
567         /* Wait for all sends and receives to complete */
568         begin = jiffies;
569
570         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
571                 if (time_after(jiffies, begin + 5 * HZ)) {
572                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
573                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
574
575                         /*
576                          * assume the HW is wedged and just free up
577                          * all our pending work requests.
578                          */
579                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
580                                 tx_req = &priv->tx_ring[priv->tx_tail &
581                                                         (ipoib_sendq_size - 1)];
582                                 ib_dma_unmap_single(priv->ca,
583                                                     tx_req->mapping,
584                                                     tx_req->skb->len,
585                                                     DMA_TO_DEVICE);
586                                 dev_kfree_skb_any(tx_req->skb);
587                                 ++priv->tx_tail;
588                         }
589
590                         for (i = 0; i < ipoib_recvq_size; ++i) {
591                                 struct ipoib_rx_buf *rx_req;
592
593                                 rx_req = &priv->rx_ring[i];
594                                 if (!rx_req->skb)
595                                         continue;
596                                 ib_dma_unmap_single(priv->ca,
597                                                     rx_req->mapping,
598                                                     IPOIB_BUF_SIZE,
599                                                     DMA_FROM_DEVICE);
600                                 dev_kfree_skb_any(rx_req->skb);
601                                 rx_req->skb = NULL;
602                         }
603
604                         goto timeout;
605                 }
606
607                 do {
608                         n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
609                         for (i = 0; i < n; ++i) {
610                                 if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
611                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
612                                 else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
613                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
614                                 else
615                                         ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
616                         }
617                 } while (n == IPOIB_NUM_WC);
618
619                 msleep(1);
620         }
621
622         ipoib_dbg(priv, "All sends and receives done.\n");
623
624 timeout:
625         qp_attr.qp_state = IB_QPS_RESET;
626         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
627                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
628
629         /* Wait for all AHs to be reaped */
630         set_bit(IPOIB_STOP_REAPER, &priv->flags);
631         cancel_delayed_work(&priv->ah_reap_task);
632         flush_workqueue(ipoib_workqueue);
633
634         begin = jiffies;
635
636         while (!list_empty(&priv->dead_ahs)) {
637                 __ipoib_reap_ah(dev);
638
639                 if (time_after(jiffies, begin + HZ)) {
640                         ipoib_warn(priv, "timing out; will leak address handles\n");
641                         break;
642                 }
643
644                 msleep(1);
645         }
646
647         netif_poll_enable(dev);
648         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
649
650         return 0;
651 }
652
653 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
654 {
655         struct ipoib_dev_priv *priv = netdev_priv(dev);
656
657         priv->ca = ca;
658         priv->port = port;
659         priv->qp = NULL;
660
661         if (ipoib_transport_dev_init(dev, ca)) {
662                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
663                 return -ENODEV;
664         }
665
666         if (dev->flags & IFF_UP) {
667                 if (ipoib_ib_dev_open(dev)) {
668                         ipoib_transport_dev_cleanup(dev);
669                         return -ENODEV;
670                 }
671         }
672
673         return 0;
674 }
675
676 void ipoib_ib_dev_flush(struct work_struct *work)
677 {
678         struct ipoib_dev_priv *cpriv, *priv =
679                 container_of(work, struct ipoib_dev_priv, flush_task);
680         struct net_device *dev = priv->dev;
681
682         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) ) {
683                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
684                 return;
685         }
686
687         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
688                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
689                 return;
690         }
691
692         ipoib_dbg(priv, "flushing\n");
693
694         ipoib_ib_dev_down(dev, 0);
695
696         /*
697          * The device could have been brought down between the start and when
698          * we get here, don't bring it back up if it's not configured up
699          */
700         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
701                 ipoib_ib_dev_up(dev);
702                 ipoib_mcast_restart_task(&priv->restart_task);
703         }
704
705         mutex_lock(&priv->vlan_mutex);
706
707         /* Flush any child interfaces too */
708         list_for_each_entry(cpriv, &priv->child_intfs, list)
709                 ipoib_ib_dev_flush(&cpriv->flush_task);
710
711         mutex_unlock(&priv->vlan_mutex);
712 }
713
714 void ipoib_ib_dev_cleanup(struct net_device *dev)
715 {
716         struct ipoib_dev_priv *priv = netdev_priv(dev);
717
718         ipoib_dbg(priv, "cleaning up ib_dev\n");
719
720         ipoib_mcast_stop_thread(dev, 1);
721         ipoib_mcast_dev_flush(dev);
722
723         ipoib_transport_dev_cleanup(dev);
724 }
725
726 /*
727  * Delayed P_Key Assigment Interim Support
728  *
729  * The following is initial implementation of delayed P_Key assigment
730  * mechanism. It is using the same approach implemented for the multicast
731  * group join. The single goal of this implementation is to quickly address
732  * Bug #2507. This implementation will probably be removed when the P_Key
733  * change async notification is available.
734  */
735
736 void ipoib_pkey_poll(struct work_struct *work)
737 {
738         struct ipoib_dev_priv *priv =
739                 container_of(work, struct ipoib_dev_priv, pkey_task.work);
740         struct net_device *dev = priv->dev;
741
742         ipoib_pkey_dev_check_presence(dev);
743
744         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
745                 ipoib_open(dev);
746         else {
747                 mutex_lock(&pkey_mutex);
748                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
749                         queue_delayed_work(ipoib_workqueue,
750                                            &priv->pkey_task,
751                                            HZ);
752                 mutex_unlock(&pkey_mutex);
753         }
754 }
755
756 int ipoib_pkey_dev_delay_open(struct net_device *dev)
757 {
758         struct ipoib_dev_priv *priv = netdev_priv(dev);
759
760         /* Look for the interface pkey value in the IB Port P_Key table and */
761         /* set the interface pkey assigment flag                            */
762         ipoib_pkey_dev_check_presence(dev);
763
764         /* P_Key value not assigned yet - start polling */
765         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
766                 mutex_lock(&pkey_mutex);
767                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
768                 queue_delayed_work(ipoib_workqueue,
769                                    &priv->pkey_task,
770                                    HZ);
771                 mutex_unlock(&pkey_mutex);
772                 return 1;
773         }
774
775         return 0;
776 }