Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[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 #define IPOIB_OP_RECV   (1ul << 31)
54
55 static DECLARE_MUTEX(pkey_sem);
56
57 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
58                                  struct ib_pd *pd, struct ib_ah_attr *attr)
59 {
60         struct ipoib_ah *ah;
61
62         ah = kmalloc(sizeof *ah, GFP_KERNEL);
63         if (!ah)
64                 return NULL;
65
66         ah->dev       = dev;
67         ah->last_send = 0;
68         kref_init(&ah->ref);
69
70         ah->ah = ib_create_ah(pd, attr);
71         if (IS_ERR(ah->ah)) {
72                 kfree(ah);
73                 ah = NULL;
74         } else
75                 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
76
77         return ah;
78 }
79
80 void ipoib_free_ah(struct kref *kref)
81 {
82         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
83         struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
84
85         unsigned long flags;
86
87         if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
88                 ipoib_dbg(priv, "Freeing ah %p\n", ah->ah);
89                 ib_destroy_ah(ah->ah);
90                 kfree(ah);
91         } else {
92                 spin_lock_irqsave(&priv->lock, flags);
93                 list_add_tail(&ah->list, &priv->dead_ahs);
94                 spin_unlock_irqrestore(&priv->lock, flags);
95         }
96 }
97
98 static int ipoib_ib_post_receive(struct net_device *dev, int id)
99 {
100         struct ipoib_dev_priv *priv = netdev_priv(dev);
101         struct ib_sge list;
102         struct ib_recv_wr param;
103         struct ib_recv_wr *bad_wr;
104         int ret;
105
106         list.addr     = priv->rx_ring[id].mapping;
107         list.length   = IPOIB_BUF_SIZE;
108         list.lkey     = priv->mr->lkey;
109
110         param.next    = NULL;
111         param.wr_id   = id | IPOIB_OP_RECV;
112         param.sg_list = &list;
113         param.num_sge = 1;
114
115         ret = ib_post_recv(priv->qp, &param, &bad_wr);
116         if (unlikely(ret)) {
117                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
118                 dma_unmap_single(priv->ca->dma_device,
119                                  priv->rx_ring[id].mapping,
120                                  IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
121                 dev_kfree_skb_any(priv->rx_ring[id].skb);
122                 priv->rx_ring[id].skb = NULL;
123         }
124
125         return ret;
126 }
127
128 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
129 {
130         struct ipoib_dev_priv *priv = netdev_priv(dev);
131         struct sk_buff *skb;
132         dma_addr_t addr;
133
134         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
135         if (!skb)
136                 return -ENOMEM;
137
138         /*
139          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
140          * header.  So we need 4 more bytes to get to 48 and align the
141          * IP header to a multiple of 16.
142          */
143         skb_reserve(skb, 4);
144
145         addr = dma_map_single(priv->ca->dma_device,
146                               skb->data, IPOIB_BUF_SIZE,
147                               DMA_FROM_DEVICE);
148         if (unlikely(dma_mapping_error(addr))) {
149                 dev_kfree_skb_any(skb);
150                 return -EIO;
151         }
152
153         priv->rx_ring[id].skb     = skb;
154         priv->rx_ring[id].mapping = addr;
155
156         return 0;
157 }
158
159 static int ipoib_ib_post_receives(struct net_device *dev)
160 {
161         struct ipoib_dev_priv *priv = netdev_priv(dev);
162         int i;
163
164         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) {
165                 if (ipoib_alloc_rx_skb(dev, i)) {
166                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
167                         return -ENOMEM;
168                 }
169                 if (ipoib_ib_post_receive(dev, i)) {
170                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
171                         return -EIO;
172                 }
173         }
174
175         return 0;
176 }
177
178 static void ipoib_ib_handle_wc(struct net_device *dev,
179                                struct ib_wc *wc)
180 {
181         struct ipoib_dev_priv *priv = netdev_priv(dev);
182         unsigned int wr_id = wc->wr_id;
183
184         ipoib_dbg_data(priv, "called: id %d, op %d, status: %d\n",
185                        wr_id, wc->opcode, wc->status);
186
187         if (wr_id & IPOIB_OP_RECV) {
188                 wr_id &= ~IPOIB_OP_RECV;
189
190                 if (wr_id < IPOIB_RX_RING_SIZE) {
191                         struct sk_buff *skb  = priv->rx_ring[wr_id].skb;
192                         dma_addr_t      addr = priv->rx_ring[wr_id].mapping;
193
194                         if (unlikely(wc->status != IB_WC_SUCCESS)) {
195                                 if (wc->status != IB_WC_WR_FLUSH_ERR)
196                                         ipoib_warn(priv, "failed recv event "
197                                                    "(status=%d, wrid=%d vend_err %x)\n",
198                                                    wc->status, wr_id, wc->vendor_err);
199                                 dma_unmap_single(priv->ca->dma_device, addr,
200                                                  IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
201                                 dev_kfree_skb_any(skb);
202                                 priv->rx_ring[wr_id].skb = NULL;
203                                 return;
204                         }
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                                 ++priv->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                         dma_unmap_single(priv->ca->dma_device, addr,
219                                          IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
220
221                         skb_put(skb, wc->byte_len);
222                         skb_pull(skb, IB_GRH_BYTES);
223
224                         if (wc->slid != priv->local_lid ||
225                             wc->src_qp != priv->qp->qp_num) {
226                                 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
227                                 skb->mac.raw = skb->data;
228                                 skb_pull(skb, IPOIB_ENCAP_LEN);
229
230                                 dev->last_rx = jiffies;
231                                 ++priv->stats.rx_packets;
232                                 priv->stats.rx_bytes += skb->len;
233
234                                 skb->dev = dev;
235                                 /* XXX get correct PACKET_ type here */
236                                 skb->pkt_type = PACKET_HOST;
237                                 netif_rx_ni(skb);
238                         } else {
239                                 ipoib_dbg_data(priv, "dropping loopback packet\n");
240                                 dev_kfree_skb_any(skb);
241                         }
242
243                 repost:
244                         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
245                                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
246                                            "for buf %d\n", wr_id);
247                 } else
248                         ipoib_warn(priv, "completion event with wrid %d\n",
249                                    wr_id);
250
251         } else {
252                 struct ipoib_tx_buf *tx_req;
253                 unsigned long flags;
254
255                 if (wr_id >= IPOIB_TX_RING_SIZE) {
256                         ipoib_warn(priv, "completion event with wrid %d (> %d)\n",
257                                    wr_id, IPOIB_TX_RING_SIZE);
258                         return;
259                 }
260
261                 ipoib_dbg_data(priv, "send complete, wrid %d\n", wr_id);
262
263                 tx_req = &priv->tx_ring[wr_id];
264
265                 dma_unmap_single(priv->ca->dma_device,
266                                  pci_unmap_addr(tx_req, mapping),
267                                  tx_req->skb->len,
268                                  DMA_TO_DEVICE);
269
270                 ++priv->stats.tx_packets;
271                 priv->stats.tx_bytes += tx_req->skb->len;
272
273                 dev_kfree_skb_any(tx_req->skb);
274
275                 spin_lock_irqsave(&priv->tx_lock, flags);
276                 ++priv->tx_tail;
277                 if (netif_queue_stopped(dev) &&
278                     priv->tx_head - priv->tx_tail <= IPOIB_TX_RING_SIZE / 2)
279                         netif_wake_queue(dev);
280                 spin_unlock_irqrestore(&priv->tx_lock, flags);
281
282                 if (wc->status != IB_WC_SUCCESS &&
283                     wc->status != IB_WC_WR_FLUSH_ERR)
284                         ipoib_warn(priv, "failed send event "
285                                    "(status=%d, wrid=%d vend_err %x)\n",
286                                    wc->status, wr_id, wc->vendor_err);
287         }
288 }
289
290 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
291 {
292         struct net_device *dev = (struct net_device *) dev_ptr;
293         struct ipoib_dev_priv *priv = netdev_priv(dev);
294         int n, i;
295
296         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
297         do {
298                 n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc);
299                 for (i = 0; i < n; ++i)
300                         ipoib_ib_handle_wc(dev, priv->ibwc + i);
301         } while (n == IPOIB_NUM_WC);
302 }
303
304 static inline int post_send(struct ipoib_dev_priv *priv,
305                             unsigned int wr_id,
306                             struct ib_ah *address, u32 qpn,
307                             dma_addr_t addr, int len)
308 {
309         struct ib_send_wr *bad_wr;
310
311         priv->tx_sge.addr             = addr;
312         priv->tx_sge.length           = len;
313
314         priv->tx_wr.wr_id             = wr_id;
315         priv->tx_wr.wr.ud.remote_qpn  = qpn;
316         priv->tx_wr.wr.ud.ah          = address;
317
318         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
319 }
320
321 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
322                 struct ipoib_ah *address, u32 qpn)
323 {
324         struct ipoib_dev_priv *priv = netdev_priv(dev);
325         struct ipoib_tx_buf *tx_req;
326         dma_addr_t addr;
327
328         if (skb->len > dev->mtu + INFINIBAND_ALEN) {
329                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
330                            skb->len, dev->mtu + INFINIBAND_ALEN);
331                 ++priv->stats.tx_dropped;
332                 ++priv->stats.tx_errors;
333                 dev_kfree_skb_any(skb);
334                 return;
335         }
336
337         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
338                        skb->len, address, qpn);
339
340         /*
341          * We put the skb into the tx_ring _before_ we call post_send()
342          * because it's entirely possible that the completion handler will
343          * run before we execute anything after the post_send().  That
344          * means we have to make sure everything is properly recorded and
345          * our state is consistent before we call post_send().
346          */
347         tx_req = &priv->tx_ring[priv->tx_head & (IPOIB_TX_RING_SIZE - 1)];
348         tx_req->skb = skb;
349         addr = dma_map_single(priv->ca->dma_device, skb->data, skb->len,
350                               DMA_TO_DEVICE);
351         pci_unmap_addr_set(tx_req, mapping, addr);
352
353         if (unlikely(post_send(priv, priv->tx_head & (IPOIB_TX_RING_SIZE - 1),
354                                address->ah, qpn, addr, skb->len))) {
355                 ipoib_warn(priv, "post_send failed\n");
356                 ++priv->stats.tx_errors;
357                 dma_unmap_single(priv->ca->dma_device, addr, skb->len,
358                                  DMA_TO_DEVICE);
359                 dev_kfree_skb_any(skb);
360         } else {
361                 dev->trans_start = jiffies;
362
363                 address->last_send = priv->tx_head;
364                 ++priv->tx_head;
365
366                 if (priv->tx_head - priv->tx_tail == IPOIB_TX_RING_SIZE) {
367                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
368                         netif_stop_queue(dev);
369                 }
370         }
371 }
372
373 static void __ipoib_reap_ah(struct net_device *dev)
374 {
375         struct ipoib_dev_priv *priv = netdev_priv(dev);
376         struct ipoib_ah *ah, *tah;
377         LIST_HEAD(remove_list);
378
379         spin_lock_irq(&priv->lock);
380         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
381                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
382                         list_del(&ah->list);
383                         list_add_tail(&ah->list, &remove_list);
384                 }
385         spin_unlock_irq(&priv->lock);
386
387         list_for_each_entry_safe(ah, tah, &remove_list, list) {
388                 ipoib_dbg(priv, "Reaping ah %p\n", ah->ah);
389                 ib_destroy_ah(ah->ah);
390                 kfree(ah);
391         }
392 }
393
394 void ipoib_reap_ah(void *dev_ptr)
395 {
396         struct net_device *dev = dev_ptr;
397         struct ipoib_dev_priv *priv = netdev_priv(dev);
398
399         __ipoib_reap_ah(dev);
400
401         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
402                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
403 }
404
405 int ipoib_ib_dev_open(struct net_device *dev)
406 {
407         struct ipoib_dev_priv *priv = netdev_priv(dev);
408         int ret;
409
410         ret = ipoib_init_qp(dev);
411         if (ret) {
412                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
413                 return -1;
414         }
415
416         ret = ipoib_ib_post_receives(dev);
417         if (ret) {
418                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
419                 return -1;
420         }
421
422         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
423         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
424
425         return 0;
426 }
427
428 int ipoib_ib_dev_up(struct net_device *dev)
429 {
430         struct ipoib_dev_priv *priv = netdev_priv(dev);
431
432         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
433
434         return ipoib_mcast_start_thread(dev);
435 }
436
437 int ipoib_ib_dev_down(struct net_device *dev)
438 {
439         struct ipoib_dev_priv *priv = netdev_priv(dev);
440
441         ipoib_dbg(priv, "downing ib_dev\n");
442
443         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
444         netif_carrier_off(dev);
445
446         /* Shutdown the P_Key thread if still active */
447         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
448                 down(&pkey_sem);
449                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
450                 cancel_delayed_work(&priv->pkey_task);
451                 up(&pkey_sem);
452                 flush_workqueue(ipoib_workqueue);
453         }
454
455         ipoib_mcast_stop_thread(dev, 1);
456
457         /*
458          * Flush the multicast groups first so we stop any multicast joins. The
459          * completion thread may have already died and we may deadlock waiting
460          * for the completion thread to finish some multicast joins.
461          */
462         ipoib_mcast_dev_flush(dev);
463
464         /* Delete broadcast and local addresses since they will be recreated */
465         ipoib_mcast_dev_down(dev);
466
467         ipoib_flush_paths(dev);
468
469         return 0;
470 }
471
472 static int recvs_pending(struct net_device *dev)
473 {
474         struct ipoib_dev_priv *priv = netdev_priv(dev);
475         int pending = 0;
476         int i;
477
478         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i)
479                 if (priv->rx_ring[i].skb)
480                         ++pending;
481
482         return pending;
483 }
484
485 int ipoib_ib_dev_stop(struct net_device *dev)
486 {
487         struct ipoib_dev_priv *priv = netdev_priv(dev);
488         struct ib_qp_attr qp_attr;
489         unsigned long begin;
490         struct ipoib_tx_buf *tx_req;
491         int i;
492
493         /*
494          * Move our QP to the error state and then reinitialize in
495          * when all work requests have completed or have been flushed.
496          */
497         qp_attr.qp_state = IB_QPS_ERR;
498         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
499                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
500
501         /* Wait for all sends and receives to complete */
502         begin = jiffies;
503
504         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
505                 if (time_after(jiffies, begin + 5 * HZ)) {
506                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
507                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
508
509                         /*
510                          * assume the HW is wedged and just free up
511                          * all our pending work requests.
512                          */
513                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
514                                 tx_req = &priv->tx_ring[priv->tx_tail &
515                                                         (IPOIB_TX_RING_SIZE - 1)];
516                                 dma_unmap_single(priv->ca->dma_device,
517                                                  pci_unmap_addr(tx_req, mapping),
518                                                  tx_req->skb->len,
519                                                  DMA_TO_DEVICE);
520                                 dev_kfree_skb_any(tx_req->skb);
521                                 ++priv->tx_tail;
522                         }
523
524                         for (i = 0; i < IPOIB_RX_RING_SIZE; ++i)
525                                 if (priv->rx_ring[i].skb) {
526                                         dma_unmap_single(priv->ca->dma_device,
527                                                          pci_unmap_addr(&priv->rx_ring[i],
528                                                                         mapping),
529                                                          IPOIB_BUF_SIZE,
530                                                          DMA_FROM_DEVICE);
531                                         dev_kfree_skb_any(priv->rx_ring[i].skb);
532                                         priv->rx_ring[i].skb = NULL;
533                                 }
534
535                         goto timeout;
536                 }
537
538                 msleep(1);
539         }
540
541         ipoib_dbg(priv, "All sends and receives done.\n");
542
543 timeout:
544         qp_attr.qp_state = IB_QPS_RESET;
545         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
546                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
547
548         /* Wait for all AHs to be reaped */
549         set_bit(IPOIB_STOP_REAPER, &priv->flags);
550         cancel_delayed_work(&priv->ah_reap_task);
551         flush_workqueue(ipoib_workqueue);
552
553         begin = jiffies;
554
555         while (!list_empty(&priv->dead_ahs)) {
556                 __ipoib_reap_ah(dev);
557
558                 if (time_after(jiffies, begin + HZ)) {
559                         ipoib_warn(priv, "timing out; will leak address handles\n");
560                         break;
561                 }
562
563                 msleep(1);
564         }
565
566         return 0;
567 }
568
569 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
570 {
571         struct ipoib_dev_priv *priv = netdev_priv(dev);
572
573         priv->ca = ca;
574         priv->port = port;
575         priv->qp = NULL;
576
577         if (ipoib_transport_dev_init(dev, ca)) {
578                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
579                 return -ENODEV;
580         }
581
582         if (dev->flags & IFF_UP) {
583                 if (ipoib_ib_dev_open(dev)) {
584                         ipoib_transport_dev_cleanup(dev);
585                         return -ENODEV;
586                 }
587         }
588
589         return 0;
590 }
591
592 void ipoib_ib_dev_flush(void *_dev)
593 {
594         struct net_device *dev = (struct net_device *)_dev;
595         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv;
596
597         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
598                 return;
599
600         ipoib_dbg(priv, "flushing\n");
601
602         ipoib_ib_dev_down(dev);
603
604         /*
605          * The device could have been brought down between the start and when
606          * we get here, don't bring it back up if it's not configured up
607          */
608         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
609                 ipoib_ib_dev_up(dev);
610
611         down(&priv->vlan_mutex);
612
613         /* Flush any child interfaces too */
614         list_for_each_entry(cpriv, &priv->child_intfs, list)
615                 ipoib_ib_dev_flush(&cpriv->dev);
616
617         up(&priv->vlan_mutex);
618 }
619
620 void ipoib_ib_dev_cleanup(struct net_device *dev)
621 {
622         struct ipoib_dev_priv *priv = netdev_priv(dev);
623
624         ipoib_dbg(priv, "cleaning up ib_dev\n");
625
626         ipoib_mcast_stop_thread(dev, 1);
627
628         /* Delete the broadcast address and the local address */
629         ipoib_mcast_dev_down(dev);
630
631         ipoib_transport_dev_cleanup(dev);
632 }
633
634 /*
635  * Delayed P_Key Assigment Interim Support
636  *
637  * The following is initial implementation of delayed P_Key assigment
638  * mechanism. It is using the same approach implemented for the multicast
639  * group join. The single goal of this implementation is to quickly address
640  * Bug #2507. This implementation will probably be removed when the P_Key
641  * change async notification is available.
642  */
643
644 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
645 {
646         struct ipoib_dev_priv *priv = netdev_priv(dev);
647         u16 pkey_index = 0;
648
649         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
650                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
651         else
652                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
653 }
654
655 void ipoib_pkey_poll(void *dev_ptr)
656 {
657         struct net_device *dev = dev_ptr;
658         struct ipoib_dev_priv *priv = netdev_priv(dev);
659
660         ipoib_pkey_dev_check_presence(dev);
661
662         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
663                 ipoib_open(dev);
664         else {
665                 down(&pkey_sem);
666                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
667                         queue_delayed_work(ipoib_workqueue,
668                                            &priv->pkey_task,
669                                            HZ);
670                 up(&pkey_sem);
671         }
672 }
673
674 int ipoib_pkey_dev_delay_open(struct net_device *dev)
675 {
676         struct ipoib_dev_priv *priv = netdev_priv(dev);
677
678         /* Look for the interface pkey value in the IB Port P_Key table and */
679         /* set the interface pkey assigment flag                            */
680         ipoib_pkey_dev_check_presence(dev);
681
682         /* P_Key value not assigned yet - start polling */
683         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
684                 down(&pkey_sem);
685                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
686                 queue_delayed_work(ipoib_workqueue,
687                                    &priv->pkey_task,
688                                    HZ);
689                 up(&pkey_sem);
690                 return 1;
691         }
692
693         return 0;
694 }