/spare/repo/netdev-2.6 branch 'master'
[linux-2.6] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
1 /*
2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
33  */
34
35 #include <linux/delay.h>
36 #include <linux/dma-mapping.h>
37
38 #include <ib_cache.h>
39
40 #include "ipoib.h"
41
42 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
43 static int data_debug_level;
44
45 module_param(data_debug_level, int, 0644);
46 MODULE_PARM_DESC(data_debug_level,
47                  "Enable data path debug tracing if > 0");
48 #endif
49
50 #define IPOIB_OP_RECV   (1ul << 31)
51
52 static DECLARE_MUTEX(pkey_sem);
53
54 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
55                                  struct ib_pd *pd, struct ib_ah_attr *attr)
56 {
57         struct ipoib_ah *ah;
58
59         ah = kmalloc(sizeof *ah, GFP_KERNEL);
60         if (!ah)
61                 return NULL;
62
63         ah->dev       = dev;
64         ah->last_send = 0;
65         kref_init(&ah->ref);
66
67         ah->ah = ib_create_ah(pd, attr);
68         if (IS_ERR(ah->ah)) {
69                 kfree(ah);
70                 ah = NULL;
71         } else
72                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
73
74         return ah;
75 }
76
77 void ipoib_free_ah(struct kref *kref)
78 {
79         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
80         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
81
82         unsigned long flags;
83
84         if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
85                 ipoib_dbg(priv, "Freeing ah %p\n", ah->ah);
86                 ib_destroy_ah(ah->ah);
87                 kfree(ah);
88         } else {
89                 spin_lock_irqsave(&priv->lock, flags);
90                 list_add_tail(&ah->list, &priv->dead_ahs);
91                 spin_unlock_irqrestore(&priv->lock, flags);
92         }
93 }
94
95 static inline int ipoib_ib_receive(struct ipoib_dev_priv *priv,
96                                    unsigned int wr_id,
97                                    dma_addr_t addr)
98 {
99         struct ib_sge list = {
100                 .addr    = addr,
101                 .length  = IPOIB_BUF_SIZE,
102                 .lkey    = priv->mr->lkey,
103         };
104         struct ib_recv_wr param = {
105                 .wr_id      = wr_id | IPOIB_OP_RECV,
106                 .sg_list    = &list,
107                 .num_sge    = 1,
108         };
109         struct ib_recv_wr *bad_wr;
110
111         return ib_post_recv(priv->qp, &param, &bad_wr);
112 }
113
114 static int ipoib_ib_post_receive(struct net_device *dev, int id)
115 {
116         struct ipoib_dev_priv *priv = netdev_priv(dev);
117         struct sk_buff *skb;
118         dma_addr_t addr;
119         int ret;
120
121         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
122         if (!skb) {
123                 ipoib_warn(priv, "failed to allocate receive buffer\n");
124
125                 priv->rx_ring[id].skb = NULL;
126                 return -ENOMEM;
127         }
128         skb_reserve(skb, 4);    /* 16 byte align IP header */
129         priv->rx_ring[id].skb = skb;
130         addr = dma_map_single(priv->ca->dma_device,
131                               skb->data, IPOIB_BUF_SIZE,
132                               DMA_FROM_DEVICE);
133         pci_unmap_addr_set(&priv->rx_ring[id], mapping, addr);
134
135         ret = ipoib_ib_receive(priv, id, addr);
136         if (ret) {
137                 ipoib_warn(priv, "ipoib_ib_receive failed for buf %d (%d)\n",
138                            id, ret);
139                 dma_unmap_single(priv->ca->dma_device, addr,
140                                  IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
141                 dev_kfree_skb_any(skb);
142                 priv->rx_ring[id].skb = NULL;
143         }
144
145         return ret;
146 }
147
148 static int ipoib_ib_post_receives(struct net_device *dev)
149 {
150         struct ipoib_dev_priv *priv = netdev_priv(dev);
151         int i;
152
153         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) {
154                 if (ipoib_ib_post_receive(dev, i)) {
155                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
156                         return -EIO;
157                 }
158         }
159
160         return 0;
161 }
162
163 static void ipoib_ib_handle_wc(struct net_device *dev,
164                                struct ib_wc *wc)
165 {
166         struct ipoib_dev_priv *priv = netdev_priv(dev);
167         unsigned int wr_id = wc->wr_id;
168
169         ipoib_dbg_data(priv, "called: id %d, op %d, status: %d\n",
170                        wr_id, wc->opcode, wc->status);
171
172         if (wr_id & IPOIB_OP_RECV) {
173                 wr_id &= ~IPOIB_OP_RECV;
174
175                 if (wr_id < IPOIB_RX_RING_SIZE) {
176                         struct sk_buff *skb = priv->rx_ring[wr_id].skb;
177
178                         priv->rx_ring[wr_id].skb = NULL;
179
180                         dma_unmap_single(priv->ca->dma_device,
181                                          pci_unmap_addr(&priv->rx_ring[wr_id],
182                                                         mapping),
183                                          IPOIB_BUF_SIZE,
184                                          DMA_FROM_DEVICE);
185
186                         if (wc->status != IB_WC_SUCCESS) {
187                                 if (wc->status != IB_WC_WR_FLUSH_ERR)
188                                         ipoib_warn(priv, "failed recv event "
189                                                    "(status=%d, wrid=%d vend_err %x)\n",
190                                                    wc->status, wr_id, wc->vendor_err);
191                                 dev_kfree_skb_any(skb);
192                                 return;
193                         }
194
195                         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
196                                        wc->byte_len, wc->slid);
197
198                         skb_put(skb, wc->byte_len);
199                         skb_pull(skb, IB_GRH_BYTES);
200
201                         if (wc->slid != priv->local_lid ||
202                             wc->src_qp != priv->qp->qp_num) {
203                                 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
204                                 skb->mac.raw = skb->data;
205                                 skb_pull(skb, IPOIB_ENCAP_LEN);
206
207                                 dev->last_rx = jiffies;
208                                 ++priv->stats.rx_packets;
209                                 priv->stats.rx_bytes += skb->len;
210
211                                 skb->dev = dev;
212                                 /* XXX get correct PACKET_ type here */
213                                 skb->pkt_type = PACKET_HOST;
214                                 netif_rx_ni(skb);
215                         } else {
216                                 ipoib_dbg_data(priv, "dropping loopback packet\n");
217                                 dev_kfree_skb_any(skb);
218                         }
219
220                         /* repost receive */
221                         if (ipoib_ib_post_receive(dev, wr_id))
222                                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
223                                            "for buf %d\n", wr_id);
224                 } else
225                         ipoib_warn(priv, "completion event with wrid %d\n",
226                                    wr_id);
227
228         } else {
229                 struct ipoib_buf *tx_req;
230                 unsigned long flags;
231
232                 if (wr_id >= IPOIB_TX_RING_SIZE) {
233                         ipoib_warn(priv, "completion event with wrid %d (> %d)\n",
234                                    wr_id, IPOIB_TX_RING_SIZE);
235                         return;
236                 }
237
238                 ipoib_dbg_data(priv, "send complete, wrid %d\n", wr_id);
239
240                 tx_req = &priv->tx_ring[wr_id];
241
242                 dma_unmap_single(priv->ca->dma_device,
243                                  pci_unmap_addr(tx_req, mapping),
244                                  tx_req->skb->len,
245                                  DMA_TO_DEVICE);
246
247                 ++priv->stats.tx_packets;
248                 priv->stats.tx_bytes += tx_req->skb->len;
249
250                 dev_kfree_skb_any(tx_req->skb);
251
252                 spin_lock_irqsave(&priv->tx_lock, flags);
253                 ++priv->tx_tail;
254                 if (netif_queue_stopped(dev) &&
255                     priv->tx_head - priv->tx_tail <= IPOIB_TX_RING_SIZE / 2)
256                         netif_wake_queue(dev);
257                 spin_unlock_irqrestore(&priv->tx_lock, flags);
258
259                 if (wc->status != IB_WC_SUCCESS &&
260                     wc->status != IB_WC_WR_FLUSH_ERR)
261                         ipoib_warn(priv, "failed send event "
262                                    "(status=%d, wrid=%d vend_err %x)\n",
263                                    wc->status, wr_id, wc->vendor_err);
264         }
265 }
266
267 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
268 {
269         struct net_device *dev = (struct net_device *) dev_ptr;
270         struct ipoib_dev_priv *priv = netdev_priv(dev);
271         int n, i;
272
273         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
274         do {
275                 n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc);
276                 for (i = 0; i < n; ++i)
277                         ipoib_ib_handle_wc(dev, priv->ibwc + i);
278         } while (n == IPOIB_NUM_WC);
279 }
280
281 static inline int post_send(struct ipoib_dev_priv *priv,
282                             unsigned int wr_id,
283                             struct ib_ah *address, u32 qpn,
284                             dma_addr_t addr, int len)
285 {
286         struct ib_send_wr *bad_wr;
287
288         priv->tx_sge.addr             = addr;
289         priv->tx_sge.length           = len;
290
291         priv->tx_wr.wr_id             = wr_id;
292         priv->tx_wr.wr.ud.remote_qpn  = qpn;
293         priv->tx_wr.wr.ud.ah          = address;
294
295         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
296 }
297
298 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
299                 struct ipoib_ah *address, u32 qpn)
300 {
301         struct ipoib_dev_priv *priv = netdev_priv(dev);
302         struct ipoib_buf *tx_req;
303         dma_addr_t addr;
304
305         if (skb->len > dev->mtu + INFINIBAND_ALEN) {
306                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
307                            skb->len, dev->mtu + INFINIBAND_ALEN);
308                 ++priv->stats.tx_dropped;
309                 ++priv->stats.tx_errors;
310                 dev_kfree_skb_any(skb);
311                 return;
312         }
313
314         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
315                        skb->len, address, qpn);
316
317         /*
318          * We put the skb into the tx_ring _before_ we call post_send()
319          * because it's entirely possible that the completion handler will
320          * run before we execute anything after the post_send().  That
321          * means we have to make sure everything is properly recorded and
322          * our state is consistent before we call post_send().
323          */
324         tx_req = &priv->tx_ring[priv->tx_head & (IPOIB_TX_RING_SIZE - 1)];
325         tx_req->skb = skb;
326         addr = dma_map_single(priv->ca->dma_device, skb->data, skb->len,
327                               DMA_TO_DEVICE);
328         pci_unmap_addr_set(tx_req, mapping, addr);
329
330         if (unlikely(post_send(priv, priv->tx_head & (IPOIB_TX_RING_SIZE - 1),
331                                address->ah, qpn, addr, skb->len))) {
332                 ipoib_warn(priv, "post_send failed\n");
333                 ++priv->stats.tx_errors;
334                 dma_unmap_single(priv->ca->dma_device, addr, skb->len,
335                                  DMA_TO_DEVICE);
336                 dev_kfree_skb_any(skb);
337         } else {
338                 dev->trans_start = jiffies;
339
340                 address->last_send = priv->tx_head;
341                 ++priv->tx_head;
342
343                 if (priv->tx_head - priv->tx_tail == IPOIB_TX_RING_SIZE) {
344                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
345                         netif_stop_queue(dev);
346                 }
347         }
348 }
349
350 static void __ipoib_reap_ah(struct net_device *dev)
351 {
352         struct ipoib_dev_priv *priv = netdev_priv(dev);
353         struct ipoib_ah *ah, *tah;
354         LIST_HEAD(remove_list);
355
356         spin_lock_irq(&priv->lock);
357         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
358                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
359                         list_del(&ah->list);
360                         list_add_tail(&ah->list, &remove_list);
361                 }
362         spin_unlock_irq(&priv->lock);
363
364         list_for_each_entry_safe(ah, tah, &remove_list, list) {
365                 ipoib_dbg(priv, "Reaping ah %p\n", ah->ah);
366                 ib_destroy_ah(ah->ah);
367                 kfree(ah);
368         }
369 }
370
371 void ipoib_reap_ah(void *dev_ptr)
372 {
373         struct net_device *dev = dev_ptr;
374         struct ipoib_dev_priv *priv = netdev_priv(dev);
375
376         __ipoib_reap_ah(dev);
377
378         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
379                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
380 }
381
382 int ipoib_ib_dev_open(struct net_device *dev)
383 {
384         struct ipoib_dev_priv *priv = netdev_priv(dev);
385         int ret;
386
387         ret = ipoib_qp_create(dev);
388         if (ret) {
389                 ipoib_warn(priv, "ipoib_qp_create returned %d\n", ret);
390                 return -1;
391         }
392
393         ret = ipoib_ib_post_receives(dev);
394         if (ret) {
395                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
396                 return -1;
397         }
398
399         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
400         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
401
402         return 0;
403 }
404
405 int ipoib_ib_dev_up(struct net_device *dev)
406 {
407         struct ipoib_dev_priv *priv = netdev_priv(dev);
408
409         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
410
411         return ipoib_mcast_start_thread(dev);
412 }
413
414 int ipoib_ib_dev_down(struct net_device *dev)
415 {
416         struct ipoib_dev_priv *priv = netdev_priv(dev);
417
418         ipoib_dbg(priv, "downing ib_dev\n");
419
420         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
421         netif_carrier_off(dev);
422
423         /* Shutdown the P_Key thread if still active */
424         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
425                 down(&pkey_sem);
426                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
427                 cancel_delayed_work(&priv->pkey_task);
428                 up(&pkey_sem);
429                 flush_workqueue(ipoib_workqueue);
430         }
431
432         ipoib_mcast_stop_thread(dev);
433
434         /*
435          * Flush the multicast groups first so we stop any multicast joins. The
436          * completion thread may have already died and we may deadlock waiting
437          * for the completion thread to finish some multicast joins.
438          */
439         ipoib_mcast_dev_flush(dev);
440
441         /* Delete broadcast and local addresses since they will be recreated */
442         ipoib_mcast_dev_down(dev);
443
444         ipoib_flush_paths(dev);
445
446         return 0;
447 }
448
449 static int recvs_pending(struct net_device *dev)
450 {
451         struct ipoib_dev_priv *priv = netdev_priv(dev);
452         int pending = 0;
453         int i;
454
455         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i)
456                 if (priv->rx_ring[i].skb)
457                         ++pending;
458
459         return pending;
460 }
461
462 int ipoib_ib_dev_stop(struct net_device *dev)
463 {
464         struct ipoib_dev_priv *priv = netdev_priv(dev);
465         struct ib_qp_attr qp_attr;
466         int attr_mask;
467         unsigned long begin;
468         struct ipoib_buf *tx_req;
469         int i;
470
471         /* Kill the existing QP and allocate a new one */
472         qp_attr.qp_state = IB_QPS_ERR;
473         attr_mask        = IB_QP_STATE;
474         if (ib_modify_qp(priv->qp, &qp_attr, attr_mask))
475                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
476
477         /* Wait for all sends and receives to complete */
478         begin = jiffies;
479
480         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
481                 if (time_after(jiffies, begin + 5 * HZ)) {
482                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
483                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
484
485                         /*
486                          * assume the HW is wedged and just free up
487                          * all our pending work requests.
488                          */
489                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
490                                 tx_req = &priv->tx_ring[priv->tx_tail &
491                                                         (IPOIB_TX_RING_SIZE - 1)];
492                                 dma_unmap_single(priv->ca->dma_device,
493                                                  pci_unmap_addr(tx_req, mapping),
494                                                  tx_req->skb->len,
495                                                  DMA_TO_DEVICE);
496                                 dev_kfree_skb_any(tx_req->skb);
497                                 ++priv->tx_tail;
498                         }
499
500                         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i)
501                                 if (priv->rx_ring[i].skb) {
502                                         dma_unmap_single(priv->ca->dma_device,
503                                                          pci_unmap_addr(&priv->rx_ring[i],
504                                                                         mapping),
505                                                          IPOIB_BUF_SIZE,
506                                                          DMA_FROM_DEVICE);
507                                         dev_kfree_skb_any(priv->rx_ring[i].skb);
508                                         priv->rx_ring[i].skb = NULL;
509                                 }
510
511                         goto timeout;
512                 }
513
514                 msleep(1);
515         }
516
517         ipoib_dbg(priv, "All sends and receives done.\n");
518
519 timeout:
520         qp_attr.qp_state = IB_QPS_RESET;
521         attr_mask        = IB_QP_STATE;
522         if (ib_modify_qp(priv->qp, &qp_attr, attr_mask))
523                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
524
525         /* Wait for all AHs to be reaped */
526         set_bit(IPOIB_STOP_REAPER, &priv->flags);
527         cancel_delayed_work(&priv->ah_reap_task);
528         flush_workqueue(ipoib_workqueue);
529
530         begin = jiffies;
531
532         while (!list_empty(&priv->dead_ahs)) {
533                 __ipoib_reap_ah(dev);
534
535                 if (time_after(jiffies, begin + HZ)) {
536                         ipoib_warn(priv, "timing out; will leak address handles\n");
537                         break;
538                 }
539
540                 msleep(1);
541         }
542
543         return 0;
544 }
545
546 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
547 {
548         struct ipoib_dev_priv *priv = netdev_priv(dev);
549
550         priv->ca = ca;
551         priv->port = port;
552         priv->qp = NULL;
553
554         if (ipoib_transport_dev_init(dev, ca)) {
555                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
556                 return -ENODEV;
557         }
558
559         if (dev->flags & IFF_UP) {
560                 if (ipoib_ib_dev_open(dev)) {
561                         ipoib_transport_dev_cleanup(dev);
562                         return -ENODEV;
563                 }
564         }
565
566         return 0;
567 }
568
569 void ipoib_ib_dev_flush(void *_dev)
570 {
571         struct net_device *dev = (struct net_device *)_dev;
572         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv;
573
574         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
575                 return;
576
577         ipoib_dbg(priv, "flushing\n");
578
579         ipoib_ib_dev_down(dev);
580
581         /*
582          * The device could have been brought down between the start and when
583          * we get here, don't bring it back up if it's not configured up
584          */
585         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
586                 ipoib_ib_dev_up(dev);
587
588         /* Flush any child interfaces too */
589         list_for_each_entry(cpriv, &priv->child_intfs, list)
590                 ipoib_ib_dev_flush(&cpriv->dev);
591 }
592
593 void ipoib_ib_dev_cleanup(struct net_device *dev)
594 {
595         struct ipoib_dev_priv *priv = netdev_priv(dev);
596
597         ipoib_dbg(priv, "cleaning up ib_dev\n");
598
599         ipoib_mcast_stop_thread(dev);
600
601         /* Delete the broadcast address and the local address */
602         ipoib_mcast_dev_down(dev);
603
604         ipoib_transport_dev_cleanup(dev);
605 }
606
607 /*
608  * Delayed P_Key Assigment Interim Support
609  *
610  * The following is initial implementation of delayed P_Key assigment
611  * mechanism. It is using the same approach implemented for the multicast
612  * group join. The single goal of this implementation is to quickly address
613  * Bug #2507. This implementation will probably be removed when the P_Key
614  * change async notification is available.
615  */
616 int ipoib_open(struct net_device *dev);
617
618 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
619 {
620         struct ipoib_dev_priv *priv = netdev_priv(dev);
621         u16 pkey_index = 0;
622
623         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
624                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
625         else
626                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
627 }
628
629 void ipoib_pkey_poll(void *dev_ptr)
630 {
631         struct net_device *dev = dev_ptr;
632         struct ipoib_dev_priv *priv = netdev_priv(dev);
633
634         ipoib_pkey_dev_check_presence(dev);
635
636         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
637                 ipoib_open(dev);
638         else {
639                 down(&pkey_sem);
640                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
641                         queue_delayed_work(ipoib_workqueue,
642                                            &priv->pkey_task,
643                                            HZ);
644                 up(&pkey_sem);
645         }
646 }
647
648 int ipoib_pkey_dev_delay_open(struct net_device *dev)
649 {
650         struct ipoib_dev_priv *priv = netdev_priv(dev);
651
652         /* Look for the interface pkey value in the IB Port P_Key table and */
653         /* set the interface pkey assigment flag                            */
654         ipoib_pkey_dev_check_presence(dev);
655
656         /* P_Key value not assigned yet - start polling */
657         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
658                 down(&pkey_sem);
659                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
660                 queue_delayed_work(ipoib_workqueue,
661                                    &priv->pkey_task,
662                                    HZ);
663                 up(&pkey_sem);
664                 return 1;
665         }
666
667         return 0;
668 }