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[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 #include <linux/ip.h>
43 #include <linux/tcp.h>
44
45 #include "ipoib.h"
46
47 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
48 static int data_debug_level;
49
50 module_param(data_debug_level, int, 0644);
51 MODULE_PARM_DESC(data_debug_level,
52                  "Enable data path debug tracing if > 0");
53 #endif
54
55 static DEFINE_MUTEX(pkey_mutex);
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         spin_lock_irqsave(&priv->lock, flags);
88         list_add_tail(&ah->list, &priv->dead_ahs);
89         spin_unlock_irqrestore(&priv->lock, flags);
90 }
91
92 static int ipoib_ib_post_receive(struct net_device *dev, int id)
93 {
94         struct ipoib_dev_priv *priv = netdev_priv(dev);
95         struct ib_sge list;
96         struct ib_recv_wr param;
97         struct ib_recv_wr *bad_wr;
98         int ret;
99
100         list.addr     = priv->rx_ring[id].mapping;
101         list.length   = IPOIB_BUF_SIZE;
102         list.lkey     = priv->mr->lkey;
103
104         param.next    = NULL;
105         param.wr_id   = id | IPOIB_OP_RECV;
106         param.sg_list = &list;
107         param.num_sge = 1;
108
109         ret = ib_post_recv(priv->qp, &param, &bad_wr);
110         if (unlikely(ret)) {
111                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
112                 ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
113                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
114                 dev_kfree_skb_any(priv->rx_ring[id].skb);
115                 priv->rx_ring[id].skb = NULL;
116         }
117
118         return ret;
119 }
120
121 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
122 {
123         struct ipoib_dev_priv *priv = netdev_priv(dev);
124         struct sk_buff *skb;
125         u64 addr;
126
127         skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
128         if (!skb)
129                 return -ENOMEM;
130
131         /*
132          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
133          * header.  So we need 4 more bytes to get to 48 and align the
134          * IP header to a multiple of 16.
135          */
136         skb_reserve(skb, 4);
137
138         addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
139                                  DMA_FROM_DEVICE);
140         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
141                 dev_kfree_skb_any(skb);
142                 return -EIO;
143         }
144
145         priv->rx_ring[id].skb     = skb;
146         priv->rx_ring[id].mapping = addr;
147
148         return 0;
149 }
150
151 static int ipoib_ib_post_receives(struct net_device *dev)
152 {
153         struct ipoib_dev_priv *priv = netdev_priv(dev);
154         int i;
155
156         for (i = 0; i < ipoib_recvq_size; ++i) {
157                 if (ipoib_alloc_rx_skb(dev, i)) {
158                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
159                         return -ENOMEM;
160                 }
161                 if (ipoib_ib_post_receive(dev, i)) {
162                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
163                         return -EIO;
164                 }
165         }
166
167         return 0;
168 }
169
170 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
171 {
172         struct ipoib_dev_priv *priv = netdev_priv(dev);
173         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
174         struct sk_buff *skb;
175         u64 addr;
176
177         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
178                        wr_id, wc->status);
179
180         if (unlikely(wr_id >= ipoib_recvq_size)) {
181                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
182                            wr_id, ipoib_recvq_size);
183                 return;
184         }
185
186         skb  = priv->rx_ring[wr_id].skb;
187         addr = priv->rx_ring[wr_id].mapping;
188
189         if (unlikely(wc->status != IB_WC_SUCCESS)) {
190                 if (wc->status != IB_WC_WR_FLUSH_ERR)
191                         ipoib_warn(priv, "failed recv event "
192                                    "(status=%d, wrid=%d vend_err %x)\n",
193                                    wc->status, wr_id, wc->vendor_err);
194                 ib_dma_unmap_single(priv->ca, addr,
195                                     IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
196                 dev_kfree_skb_any(skb);
197                 priv->rx_ring[wr_id].skb = NULL;
198                 return;
199         }
200
201         /*
202          * Drop packets that this interface sent, ie multicast packets
203          * that the HCA has replicated.
204          */
205         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
206                 goto repost;
207
208         /*
209          * If we can't allocate a new RX buffer, dump
210          * this packet and reuse the old buffer.
211          */
212         if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
213                 ++dev->stats.rx_dropped;
214                 goto repost;
215         }
216
217         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
218                        wc->byte_len, wc->slid);
219
220         ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
221
222         skb_put(skb, wc->byte_len);
223         skb_pull(skb, IB_GRH_BYTES);
224
225         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
226         skb_reset_mac_header(skb);
227         skb_pull(skb, IPOIB_ENCAP_LEN);
228
229         dev->last_rx = jiffies;
230         ++dev->stats.rx_packets;
231         dev->stats.rx_bytes += skb->len;
232
233         skb->dev = dev;
234         /* XXX get correct PACKET_ type here */
235         skb->pkt_type = PACKET_HOST;
236
237         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
238                 skb->ip_summed = CHECKSUM_UNNECESSARY;
239
240         netif_receive_skb(skb);
241
242 repost:
243         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
244                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
245                            "for buf %d\n", wr_id);
246 }
247
248 static int ipoib_dma_map_tx(struct ib_device *ca,
249                             struct ipoib_tx_buf *tx_req)
250 {
251         struct sk_buff *skb = tx_req->skb;
252         u64 *mapping = tx_req->mapping;
253         int i;
254         int off;
255
256         if (skb_headlen(skb)) {
257                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
258                                                DMA_TO_DEVICE);
259                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
260                         return -EIO;
261
262                 off = 1;
263         } else
264                 off = 0;
265
266         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
267                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
268                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
269                                                  frag->page_offset, frag->size,
270                                                  DMA_TO_DEVICE);
271                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
272                         goto partial_error;
273         }
274         return 0;
275
276 partial_error:
277         for (; i > 0; --i) {
278                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
279                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
280         }
281
282         if (off)
283                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
284
285         return -EIO;
286 }
287
288 static void ipoib_dma_unmap_tx(struct ib_device *ca,
289                                struct ipoib_tx_buf *tx_req)
290 {
291         struct sk_buff *skb = tx_req->skb;
292         u64 *mapping = tx_req->mapping;
293         int i;
294         int off;
295
296         if (skb_headlen(skb)) {
297                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
298                 off = 1;
299         } else
300                 off = 0;
301
302         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
303                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
304                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
305                                   DMA_TO_DEVICE);
306         }
307 }
308
309 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
310 {
311         struct ipoib_dev_priv *priv = netdev_priv(dev);
312         unsigned int wr_id = wc->wr_id;
313         struct ipoib_tx_buf *tx_req;
314         unsigned long flags;
315
316         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
317                        wr_id, wc->status);
318
319         if (unlikely(wr_id >= ipoib_sendq_size)) {
320                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
321                            wr_id, ipoib_sendq_size);
322                 return;
323         }
324
325         tx_req = &priv->tx_ring[wr_id];
326
327         ipoib_dma_unmap_tx(priv->ca, tx_req);
328
329         ++dev->stats.tx_packets;
330         dev->stats.tx_bytes += tx_req->skb->len;
331
332         dev_kfree_skb_any(tx_req->skb);
333
334         spin_lock_irqsave(&priv->tx_lock, flags);
335         ++priv->tx_tail;
336         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
337             netif_queue_stopped(dev) &&
338             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
339                 netif_wake_queue(dev);
340         spin_unlock_irqrestore(&priv->tx_lock, flags);
341
342         if (wc->status != IB_WC_SUCCESS &&
343             wc->status != IB_WC_WR_FLUSH_ERR)
344                 ipoib_warn(priv, "failed send event "
345                            "(status=%d, wrid=%d vend_err %x)\n",
346                            wc->status, wr_id, wc->vendor_err);
347 }
348
349 int ipoib_poll(struct napi_struct *napi, int budget)
350 {
351         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
352         struct net_device *dev = priv->dev;
353         int done;
354         int t;
355         int n, i;
356
357         done  = 0;
358
359 poll_more:
360         while (done < budget) {
361                 int max = (budget - done);
362
363                 t = min(IPOIB_NUM_WC, max);
364                 n = ib_poll_cq(priv->cq, t, priv->ibwc);
365
366                 for (i = 0; i < n; i++) {
367                         struct ib_wc *wc = priv->ibwc + i;
368
369                         if (wc->wr_id & IPOIB_OP_RECV) {
370                                 ++done;
371                                 if (wc->wr_id & IPOIB_OP_CM)
372                                         ipoib_cm_handle_rx_wc(dev, wc);
373                                 else
374                                         ipoib_ib_handle_rx_wc(dev, wc);
375                         } else {
376                                 if (wc->wr_id & IPOIB_OP_CM)
377                                         ipoib_cm_handle_tx_wc(dev, wc);
378                                 else
379                                         ipoib_ib_handle_tx_wc(dev, wc);
380                         }
381                 }
382
383                 if (n != t)
384                         break;
385         }
386
387         if (done < budget) {
388                 netif_rx_complete(dev, napi);
389                 if (unlikely(ib_req_notify_cq(priv->cq,
390                                               IB_CQ_NEXT_COMP |
391                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
392                     netif_rx_reschedule(dev, napi))
393                         goto poll_more;
394         }
395
396         return done;
397 }
398
399 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
400 {
401         struct net_device *dev = dev_ptr;
402         struct ipoib_dev_priv *priv = netdev_priv(dev);
403
404         netif_rx_schedule(dev, &priv->napi);
405 }
406
407 static inline int post_send(struct ipoib_dev_priv *priv,
408                             unsigned int wr_id,
409                             struct ib_ah *address, u32 qpn,
410                             struct ipoib_tx_buf *tx_req,
411                             void *head, int hlen)
412 {
413         struct ib_send_wr *bad_wr;
414         int i, off;
415         struct sk_buff *skb = tx_req->skb;
416         skb_frag_t *frags = skb_shinfo(skb)->frags;
417         int nr_frags = skb_shinfo(skb)->nr_frags;
418         u64 *mapping = tx_req->mapping;
419
420         if (skb_headlen(skb)) {
421                 priv->tx_sge[0].addr         = mapping[0];
422                 priv->tx_sge[0].length       = skb_headlen(skb);
423                 off = 1;
424         } else
425                 off = 0;
426
427         for (i = 0; i < nr_frags; ++i) {
428                 priv->tx_sge[i + off].addr = mapping[i + off];
429                 priv->tx_sge[i + off].length = frags[i].size;
430         }
431         priv->tx_wr.num_sge          = nr_frags + off;
432         priv->tx_wr.wr_id            = wr_id;
433         priv->tx_wr.wr.ud.remote_qpn = qpn;
434         priv->tx_wr.wr.ud.ah         = address;
435
436         if (head) {
437                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
438                 priv->tx_wr.wr.ud.header = head;
439                 priv->tx_wr.wr.ud.hlen   = hlen;
440                 priv->tx_wr.opcode       = IB_WR_LSO;
441         } else
442                 priv->tx_wr.opcode       = IB_WR_SEND;
443
444         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
445 }
446
447 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
448                 struct ipoib_ah *address, u32 qpn)
449 {
450         struct ipoib_dev_priv *priv = netdev_priv(dev);
451         struct ipoib_tx_buf *tx_req;
452         int hlen;
453         void *phead;
454
455         if (skb_is_gso(skb)) {
456                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
457                 phead = skb->data;
458                 if (unlikely(!skb_pull(skb, hlen))) {
459                         ipoib_warn(priv, "linear data too small\n");
460                         ++dev->stats.tx_dropped;
461                         ++dev->stats.tx_errors;
462                         dev_kfree_skb_any(skb);
463                         return;
464                 }
465         } else {
466                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
467                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
468                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
469                         ++dev->stats.tx_dropped;
470                         ++dev->stats.tx_errors;
471                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
472                         return;
473                 }
474                 phead = NULL;
475                 hlen  = 0;
476         }
477
478         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
479                        skb->len, address, qpn);
480
481         /*
482          * We put the skb into the tx_ring _before_ we call post_send()
483          * because it's entirely possible that the completion handler will
484          * run before we execute anything after the post_send().  That
485          * means we have to make sure everything is properly recorded and
486          * our state is consistent before we call post_send().
487          */
488         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
489         tx_req->skb = skb;
490         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
491                 ++dev->stats.tx_errors;
492                 dev_kfree_skb_any(skb);
493                 return;
494         }
495
496         if (skb->ip_summed == CHECKSUM_PARTIAL)
497                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
498         else
499                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
500
501         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
502                                address->ah, qpn, tx_req, phead, hlen))) {
503                 ipoib_warn(priv, "post_send failed\n");
504                 ++dev->stats.tx_errors;
505                 ipoib_dma_unmap_tx(priv->ca, tx_req);
506                 dev_kfree_skb_any(skb);
507         } else {
508                 dev->trans_start = jiffies;
509
510                 address->last_send = priv->tx_head;
511                 ++priv->tx_head;
512
513                 if (++priv->tx_outstanding == ipoib_sendq_size) {
514                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
515                         netif_stop_queue(dev);
516                 }
517         }
518 }
519
520 static void __ipoib_reap_ah(struct net_device *dev)
521 {
522         struct ipoib_dev_priv *priv = netdev_priv(dev);
523         struct ipoib_ah *ah, *tah;
524         LIST_HEAD(remove_list);
525
526         spin_lock_irq(&priv->tx_lock);
527         spin_lock(&priv->lock);
528         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
529                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
530                         list_del(&ah->list);
531                         ib_destroy_ah(ah->ah);
532                         kfree(ah);
533                 }
534         spin_unlock(&priv->lock);
535         spin_unlock_irq(&priv->tx_lock);
536 }
537
538 void ipoib_reap_ah(struct work_struct *work)
539 {
540         struct ipoib_dev_priv *priv =
541                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
542         struct net_device *dev = priv->dev;
543
544         __ipoib_reap_ah(dev);
545
546         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
547                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
548                                    round_jiffies_relative(HZ));
549 }
550
551 int ipoib_ib_dev_open(struct net_device *dev)
552 {
553         struct ipoib_dev_priv *priv = netdev_priv(dev);
554         int ret;
555
556         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
557                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
558                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
559                 return -1;
560         }
561         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
562
563         ret = ipoib_init_qp(dev);
564         if (ret) {
565                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
566                 return -1;
567         }
568
569         ret = ipoib_ib_post_receives(dev);
570         if (ret) {
571                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
572                 ipoib_ib_dev_stop(dev, 1);
573                 return -1;
574         }
575
576         ret = ipoib_cm_dev_open(dev);
577         if (ret) {
578                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
579                 ipoib_ib_dev_stop(dev, 1);
580                 return -1;
581         }
582
583         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
584         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
585                            round_jiffies_relative(HZ));
586
587         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
588
589         return 0;
590 }
591
592 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
593 {
594         struct ipoib_dev_priv *priv = netdev_priv(dev);
595         u16 pkey_index = 0;
596
597         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
598                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
599         else
600                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
601 }
602
603 int ipoib_ib_dev_up(struct net_device *dev)
604 {
605         struct ipoib_dev_priv *priv = netdev_priv(dev);
606
607         ipoib_pkey_dev_check_presence(dev);
608
609         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
610                 ipoib_dbg(priv, "PKEY is not assigned.\n");
611                 return 0;
612         }
613
614         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
615
616         return ipoib_mcast_start_thread(dev);
617 }
618
619 int ipoib_ib_dev_down(struct net_device *dev, int flush)
620 {
621         struct ipoib_dev_priv *priv = netdev_priv(dev);
622
623         ipoib_dbg(priv, "downing ib_dev\n");
624
625         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
626         netif_carrier_off(dev);
627
628         /* Shutdown the P_Key thread if still active */
629         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
630                 mutex_lock(&pkey_mutex);
631                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
632                 cancel_delayed_work(&priv->pkey_poll_task);
633                 mutex_unlock(&pkey_mutex);
634                 if (flush)
635                         flush_workqueue(ipoib_workqueue);
636         }
637
638         ipoib_mcast_stop_thread(dev, flush);
639         ipoib_mcast_dev_flush(dev);
640
641         ipoib_flush_paths(dev);
642
643         return 0;
644 }
645
646 static int recvs_pending(struct net_device *dev)
647 {
648         struct ipoib_dev_priv *priv = netdev_priv(dev);
649         int pending = 0;
650         int i;
651
652         for (i = 0; i < ipoib_recvq_size; ++i)
653                 if (priv->rx_ring[i].skb)
654                         ++pending;
655
656         return pending;
657 }
658
659 void ipoib_drain_cq(struct net_device *dev)
660 {
661         struct ipoib_dev_priv *priv = netdev_priv(dev);
662         int i, n;
663         do {
664                 n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
665                 for (i = 0; i < n; ++i) {
666                         /*
667                          * Convert any successful completions to flush
668                          * errors to avoid passing packets up the
669                          * stack after bringing the device down.
670                          */
671                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
672                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
673
674                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
675                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
676                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
677                                 else
678                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
679                         } else {
680                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
681                                         ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
682                                 else
683                                         ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
684                         }
685                 }
686         } while (n == IPOIB_NUM_WC);
687 }
688
689 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
690 {
691         struct ipoib_dev_priv *priv = netdev_priv(dev);
692         struct ib_qp_attr qp_attr;
693         unsigned long begin;
694         struct ipoib_tx_buf *tx_req;
695         int i;
696
697         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
698
699         ipoib_cm_dev_stop(dev);
700
701         /*
702          * Move our QP to the error state and then reinitialize in
703          * when all work requests have completed or have been flushed.
704          */
705         qp_attr.qp_state = IB_QPS_ERR;
706         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
707                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
708
709         /* Wait for all sends and receives to complete */
710         begin = jiffies;
711
712         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
713                 if (time_after(jiffies, begin + 5 * HZ)) {
714                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
715                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
716
717                         /*
718                          * assume the HW is wedged and just free up
719                          * all our pending work requests.
720                          */
721                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
722                                 tx_req = &priv->tx_ring[priv->tx_tail &
723                                                         (ipoib_sendq_size - 1)];
724                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
725                                 dev_kfree_skb_any(tx_req->skb);
726                                 ++priv->tx_tail;
727                                 --priv->tx_outstanding;
728                         }
729
730                         for (i = 0; i < ipoib_recvq_size; ++i) {
731                                 struct ipoib_rx_buf *rx_req;
732
733                                 rx_req = &priv->rx_ring[i];
734                                 if (!rx_req->skb)
735                                         continue;
736                                 ib_dma_unmap_single(priv->ca,
737                                                     rx_req->mapping,
738                                                     IPOIB_BUF_SIZE,
739                                                     DMA_FROM_DEVICE);
740                                 dev_kfree_skb_any(rx_req->skb);
741                                 rx_req->skb = NULL;
742                         }
743
744                         goto timeout;
745                 }
746
747                 ipoib_drain_cq(dev);
748
749                 msleep(1);
750         }
751
752         ipoib_dbg(priv, "All sends and receives done.\n");
753
754 timeout:
755         qp_attr.qp_state = IB_QPS_RESET;
756         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
757                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
758
759         /* Wait for all AHs to be reaped */
760         set_bit(IPOIB_STOP_REAPER, &priv->flags);
761         cancel_delayed_work(&priv->ah_reap_task);
762         if (flush)
763                 flush_workqueue(ipoib_workqueue);
764
765         begin = jiffies;
766
767         while (!list_empty(&priv->dead_ahs)) {
768                 __ipoib_reap_ah(dev);
769
770                 if (time_after(jiffies, begin + HZ)) {
771                         ipoib_warn(priv, "timing out; will leak address handles\n");
772                         break;
773                 }
774
775                 msleep(1);
776         }
777
778         ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
779
780         return 0;
781 }
782
783 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
784 {
785         struct ipoib_dev_priv *priv = netdev_priv(dev);
786
787         priv->ca = ca;
788         priv->port = port;
789         priv->qp = NULL;
790
791         if (ipoib_transport_dev_init(dev, ca)) {
792                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
793                 return -ENODEV;
794         }
795
796         if (dev->flags & IFF_UP) {
797                 if (ipoib_ib_dev_open(dev)) {
798                         ipoib_transport_dev_cleanup(dev);
799                         return -ENODEV;
800                 }
801         }
802
803         return 0;
804 }
805
806 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
807 {
808         struct ipoib_dev_priv *cpriv;
809         struct net_device *dev = priv->dev;
810         u16 new_index;
811
812         mutex_lock(&priv->vlan_mutex);
813
814         /*
815          * Flush any child interfaces too -- they might be up even if
816          * the parent is down.
817          */
818         list_for_each_entry(cpriv, &priv->child_intfs, list)
819                 __ipoib_ib_dev_flush(cpriv, pkey_event);
820
821         mutex_unlock(&priv->vlan_mutex);
822
823         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
824                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
825                 return;
826         }
827
828         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
829                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
830                 return;
831         }
832
833         if (pkey_event) {
834                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
835                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
836                         ipoib_ib_dev_down(dev, 0);
837                         ipoib_ib_dev_stop(dev, 0);
838                         if (ipoib_pkey_dev_delay_open(dev))
839                                 return;
840                 }
841
842                 /* restart QP only if P_Key index is changed */
843                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
844                     new_index == priv->pkey_index) {
845                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
846                         return;
847                 }
848                 priv->pkey_index = new_index;
849         }
850
851         ipoib_dbg(priv, "flushing\n");
852
853         ipoib_ib_dev_down(dev, 0);
854
855         if (pkey_event) {
856                 ipoib_ib_dev_stop(dev, 0);
857                 ipoib_ib_dev_open(dev);
858         }
859
860         /*
861          * The device could have been brought down between the start and when
862          * we get here, don't bring it back up if it's not configured up
863          */
864         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
865                 ipoib_ib_dev_up(dev);
866                 ipoib_mcast_restart_task(&priv->restart_task);
867         }
868 }
869
870 void ipoib_ib_dev_flush(struct work_struct *work)
871 {
872         struct ipoib_dev_priv *priv =
873                 container_of(work, struct ipoib_dev_priv, flush_task);
874
875         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
876         __ipoib_ib_dev_flush(priv, 0);
877 }
878
879 void ipoib_pkey_event(struct work_struct *work)
880 {
881         struct ipoib_dev_priv *priv =
882                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
883
884         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
885         __ipoib_ib_dev_flush(priv, 1);
886 }
887
888 void ipoib_ib_dev_cleanup(struct net_device *dev)
889 {
890         struct ipoib_dev_priv *priv = netdev_priv(dev);
891
892         ipoib_dbg(priv, "cleaning up ib_dev\n");
893
894         ipoib_mcast_stop_thread(dev, 1);
895         ipoib_mcast_dev_flush(dev);
896
897         ipoib_transport_dev_cleanup(dev);
898 }
899
900 /*
901  * Delayed P_Key Assigment Interim Support
902  *
903  * The following is initial implementation of delayed P_Key assigment
904  * mechanism. It is using the same approach implemented for the multicast
905  * group join. The single goal of this implementation is to quickly address
906  * Bug #2507. This implementation will probably be removed when the P_Key
907  * change async notification is available.
908  */
909
910 void ipoib_pkey_poll(struct work_struct *work)
911 {
912         struct ipoib_dev_priv *priv =
913                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
914         struct net_device *dev = priv->dev;
915
916         ipoib_pkey_dev_check_presence(dev);
917
918         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
919                 ipoib_open(dev);
920         else {
921                 mutex_lock(&pkey_mutex);
922                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
923                         queue_delayed_work(ipoib_workqueue,
924                                            &priv->pkey_poll_task,
925                                            HZ);
926                 mutex_unlock(&pkey_mutex);
927         }
928 }
929
930 int ipoib_pkey_dev_delay_open(struct net_device *dev)
931 {
932         struct ipoib_dev_priv *priv = netdev_priv(dev);
933
934         /* Look for the interface pkey value in the IB Port P_Key table and */
935         /* set the interface pkey assigment flag                            */
936         ipoib_pkey_dev_check_presence(dev);
937
938         /* P_Key value not assigned yet - start polling */
939         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
940                 mutex_lock(&pkey_mutex);
941                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
942                 queue_delayed_work(ipoib_workqueue,
943                                    &priv->pkey_poll_task,
944                                    HZ);
945                 mutex_unlock(&pkey_mutex);
946                 return 1;
947         }
948
949         return 0;
950 }