Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux...
[linux-2.6.git] / 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 void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
93                                   u64 mapping[IPOIB_UD_RX_SG])
94 {
95         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
96                 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
97                                     DMA_FROM_DEVICE);
98                 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
99                                   DMA_FROM_DEVICE);
100         } else
101                 ib_dma_unmap_single(priv->ca, mapping[0],
102                                     IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
103                                     DMA_FROM_DEVICE);
104 }
105
106 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
107                                    struct sk_buff *skb,
108                                    unsigned int length)
109 {
110         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
111                 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
112                 unsigned int size;
113                 /*
114                  * There is only two buffers needed for max_payload = 4K,
115                  * first buf size is IPOIB_UD_HEAD_SIZE
116                  */
117                 skb->tail += IPOIB_UD_HEAD_SIZE;
118                 skb->len  += length;
119
120                 size = length - IPOIB_UD_HEAD_SIZE;
121
122                 frag->size     = size;
123                 skb->data_len += size;
124                 skb->truesize += size;
125         } else
126                 skb_put(skb, length);
127
128 }
129
130 static int ipoib_ib_post_receive(struct net_device *dev, int id)
131 {
132         struct ipoib_dev_priv *priv = netdev_priv(dev);
133         struct ib_recv_wr *bad_wr;
134         int ret;
135
136         priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
137         priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
138         priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
139
140
141         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
142         if (unlikely(ret)) {
143                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
144                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
145                 dev_kfree_skb_any(priv->rx_ring[id].skb);
146                 priv->rx_ring[id].skb = NULL;
147         }
148
149         return ret;
150 }
151
152 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
153 {
154         struct ipoib_dev_priv *priv = netdev_priv(dev);
155         struct sk_buff *skb;
156         int buf_size;
157         u64 *mapping;
158
159         if (ipoib_ud_need_sg(priv->max_ib_mtu))
160                 buf_size = IPOIB_UD_HEAD_SIZE;
161         else
162                 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
163
164         skb = dev_alloc_skb(buf_size + 4);
165         if (unlikely(!skb))
166                 return NULL;
167
168         /*
169          * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
170          * header.  So we need 4 more bytes to get to 48 and align the
171          * IP header to a multiple of 16.
172          */
173         skb_reserve(skb, 4);
174
175         mapping = priv->rx_ring[id].mapping;
176         mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
177                                        DMA_FROM_DEVICE);
178         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
179                 goto error;
180
181         if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
182                 struct page *page = alloc_page(GFP_ATOMIC);
183                 if (!page)
184                         goto partial_error;
185                 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
186                 mapping[1] =
187                         ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
188                                         0, PAGE_SIZE, DMA_FROM_DEVICE);
189                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
190                         goto partial_error;
191         }
192
193         priv->rx_ring[id].skb = skb;
194         return skb;
195
196 partial_error:
197         ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
198 error:
199         dev_kfree_skb_any(skb);
200         return NULL;
201 }
202
203 static int ipoib_ib_post_receives(struct net_device *dev)
204 {
205         struct ipoib_dev_priv *priv = netdev_priv(dev);
206         int i;
207
208         for (i = 0; i < ipoib_recvq_size; ++i) {
209                 if (!ipoib_alloc_rx_skb(dev, i)) {
210                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
211                         return -ENOMEM;
212                 }
213                 if (ipoib_ib_post_receive(dev, i)) {
214                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
215                         return -EIO;
216                 }
217         }
218
219         return 0;
220 }
221
222 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
223 {
224         struct ipoib_dev_priv *priv = netdev_priv(dev);
225         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
226         struct sk_buff *skb;
227         u64 mapping[IPOIB_UD_RX_SG];
228
229         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
230                        wr_id, wc->status);
231
232         if (unlikely(wr_id >= ipoib_recvq_size)) {
233                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
234                            wr_id, ipoib_recvq_size);
235                 return;
236         }
237
238         skb  = priv->rx_ring[wr_id].skb;
239
240         if (unlikely(wc->status != IB_WC_SUCCESS)) {
241                 if (wc->status != IB_WC_WR_FLUSH_ERR)
242                         ipoib_warn(priv, "failed recv event "
243                                    "(status=%d, wrid=%d vend_err %x)\n",
244                                    wc->status, wr_id, wc->vendor_err);
245                 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
246                 dev_kfree_skb_any(skb);
247                 priv->rx_ring[wr_id].skb = NULL;
248                 return;
249         }
250
251         /*
252          * Drop packets that this interface sent, ie multicast packets
253          * that the HCA has replicated.
254          */
255         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
256                 goto repost;
257
258         memcpy(mapping, priv->rx_ring[wr_id].mapping,
259                IPOIB_UD_RX_SG * sizeof *mapping);
260
261         /*
262          * If we can't allocate a new RX buffer, dump
263          * this packet and reuse the old buffer.
264          */
265         if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
266                 ++dev->stats.rx_dropped;
267                 goto repost;
268         }
269
270         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
271                        wc->byte_len, wc->slid);
272
273         ipoib_ud_dma_unmap_rx(priv, mapping);
274         ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
275
276         skb_pull(skb, IB_GRH_BYTES);
277
278         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
279         skb_reset_mac_header(skb);
280         skb_pull(skb, IPOIB_ENCAP_LEN);
281
282         dev->last_rx = jiffies;
283         ++dev->stats.rx_packets;
284         dev->stats.rx_bytes += skb->len;
285
286         skb->dev = dev;
287         /* XXX get correct PACKET_ type here */
288         skb->pkt_type = PACKET_HOST;
289
290         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
291                 skb->ip_summed = CHECKSUM_UNNECESSARY;
292
293         netif_receive_skb(skb);
294
295 repost:
296         if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
297                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
298                            "for buf %d\n", wr_id);
299 }
300
301 static int ipoib_dma_map_tx(struct ib_device *ca,
302                             struct ipoib_tx_buf *tx_req)
303 {
304         struct sk_buff *skb = tx_req->skb;
305         u64 *mapping = tx_req->mapping;
306         int i;
307         int off;
308
309         if (skb_headlen(skb)) {
310                 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
311                                                DMA_TO_DEVICE);
312                 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
313                         return -EIO;
314
315                 off = 1;
316         } else
317                 off = 0;
318
319         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
320                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
321                 mapping[i + off] = ib_dma_map_page(ca, frag->page,
322                                                  frag->page_offset, frag->size,
323                                                  DMA_TO_DEVICE);
324                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
325                         goto partial_error;
326         }
327         return 0;
328
329 partial_error:
330         for (; i > 0; --i) {
331                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
332                 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
333         }
334
335         if (off)
336                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
337
338         return -EIO;
339 }
340
341 static void ipoib_dma_unmap_tx(struct ib_device *ca,
342                                struct ipoib_tx_buf *tx_req)
343 {
344         struct sk_buff *skb = tx_req->skb;
345         u64 *mapping = tx_req->mapping;
346         int i;
347         int off;
348
349         if (skb_headlen(skb)) {
350                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
351                 off = 1;
352         } else
353                 off = 0;
354
355         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
356                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
357                 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
358                                   DMA_TO_DEVICE);
359         }
360 }
361
362 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
363 {
364         struct ipoib_dev_priv *priv = netdev_priv(dev);
365         unsigned int wr_id = wc->wr_id;
366         struct ipoib_tx_buf *tx_req;
367
368         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
369                        wr_id, wc->status);
370
371         if (unlikely(wr_id >= ipoib_sendq_size)) {
372                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
373                            wr_id, ipoib_sendq_size);
374                 return;
375         }
376
377         tx_req = &priv->tx_ring[wr_id];
378
379         ipoib_dma_unmap_tx(priv->ca, tx_req);
380
381         ++dev->stats.tx_packets;
382         dev->stats.tx_bytes += tx_req->skb->len;
383
384         dev_kfree_skb_any(tx_req->skb);
385
386         ++priv->tx_tail;
387         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
388             netif_queue_stopped(dev) &&
389             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
390                 netif_wake_queue(dev);
391
392         if (wc->status != IB_WC_SUCCESS &&
393             wc->status != IB_WC_WR_FLUSH_ERR)
394                 ipoib_warn(priv, "failed send event "
395                            "(status=%d, wrid=%d vend_err %x)\n",
396                            wc->status, wr_id, wc->vendor_err);
397 }
398
399 static int poll_tx(struct ipoib_dev_priv *priv)
400 {
401         int n, i;
402
403         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
404         for (i = 0; i < n; ++i)
405                 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
406
407         return n == MAX_SEND_CQE;
408 }
409
410 int ipoib_poll(struct napi_struct *napi, int budget)
411 {
412         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
413         struct net_device *dev = priv->dev;
414         int done;
415         int t;
416         int n, i;
417
418         done  = 0;
419
420 poll_more:
421         while (done < budget) {
422                 int max = (budget - done);
423
424                 t = min(IPOIB_NUM_WC, max);
425                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
426
427                 for (i = 0; i < n; i++) {
428                         struct ib_wc *wc = priv->ibwc + i;
429
430                         if (wc->wr_id & IPOIB_OP_RECV) {
431                                 ++done;
432                                 if (wc->wr_id & IPOIB_OP_CM)
433                                         ipoib_cm_handle_rx_wc(dev, wc);
434                                 else
435                                         ipoib_ib_handle_rx_wc(dev, wc);
436                         } else
437                                 ipoib_cm_handle_tx_wc(priv->dev, wc);
438                 }
439
440                 if (n != t)
441                         break;
442         }
443
444         if (done < budget) {
445                 netif_rx_complete(dev, napi);
446                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
447                                               IB_CQ_NEXT_COMP |
448                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
449                     netif_rx_reschedule(dev, napi))
450                         goto poll_more;
451         }
452
453         return done;
454 }
455
456 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
457 {
458         struct net_device *dev = dev_ptr;
459         struct ipoib_dev_priv *priv = netdev_priv(dev);
460
461         netif_rx_schedule(dev, &priv->napi);
462 }
463
464 static inline int post_send(struct ipoib_dev_priv *priv,
465                             unsigned int wr_id,
466                             struct ib_ah *address, u32 qpn,
467                             struct ipoib_tx_buf *tx_req,
468                             void *head, int hlen)
469 {
470         struct ib_send_wr *bad_wr;
471         int i, off;
472         struct sk_buff *skb = tx_req->skb;
473         skb_frag_t *frags = skb_shinfo(skb)->frags;
474         int nr_frags = skb_shinfo(skb)->nr_frags;
475         u64 *mapping = tx_req->mapping;
476
477         if (skb_headlen(skb)) {
478                 priv->tx_sge[0].addr         = mapping[0];
479                 priv->tx_sge[0].length       = skb_headlen(skb);
480                 off = 1;
481         } else
482                 off = 0;
483
484         for (i = 0; i < nr_frags; ++i) {
485                 priv->tx_sge[i + off].addr = mapping[i + off];
486                 priv->tx_sge[i + off].length = frags[i].size;
487         }
488         priv->tx_wr.num_sge          = nr_frags + off;
489         priv->tx_wr.wr_id            = wr_id;
490         priv->tx_wr.wr.ud.remote_qpn = qpn;
491         priv->tx_wr.wr.ud.ah         = address;
492
493         if (head) {
494                 priv->tx_wr.wr.ud.mss    = skb_shinfo(skb)->gso_size;
495                 priv->tx_wr.wr.ud.header = head;
496                 priv->tx_wr.wr.ud.hlen   = hlen;
497                 priv->tx_wr.opcode       = IB_WR_LSO;
498         } else
499                 priv->tx_wr.opcode       = IB_WR_SEND;
500
501         return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
502 }
503
504 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
505                 struct ipoib_ah *address, u32 qpn)
506 {
507         struct ipoib_dev_priv *priv = netdev_priv(dev);
508         struct ipoib_tx_buf *tx_req;
509         int hlen;
510         void *phead;
511
512         if (skb_is_gso(skb)) {
513                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
514                 phead = skb->data;
515                 if (unlikely(!skb_pull(skb, hlen))) {
516                         ipoib_warn(priv, "linear data too small\n");
517                         ++dev->stats.tx_dropped;
518                         ++dev->stats.tx_errors;
519                         dev_kfree_skb_any(skb);
520                         return;
521                 }
522         } else {
523                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
524                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
525                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
526                         ++dev->stats.tx_dropped;
527                         ++dev->stats.tx_errors;
528                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
529                         return;
530                 }
531                 phead = NULL;
532                 hlen  = 0;
533         }
534
535         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
536                        skb->len, address, qpn);
537
538         /*
539          * We put the skb into the tx_ring _before_ we call post_send()
540          * because it's entirely possible that the completion handler will
541          * run before we execute anything after the post_send().  That
542          * means we have to make sure everything is properly recorded and
543          * our state is consistent before we call post_send().
544          */
545         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
546         tx_req->skb = skb;
547         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
548                 ++dev->stats.tx_errors;
549                 dev_kfree_skb_any(skb);
550                 return;
551         }
552
553         if (skb->ip_summed == CHECKSUM_PARTIAL)
554                 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
555         else
556                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
557
558         if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
559                                address->ah, qpn, tx_req, phead, hlen))) {
560                 ipoib_warn(priv, "post_send failed\n");
561                 ++dev->stats.tx_errors;
562                 ipoib_dma_unmap_tx(priv->ca, tx_req);
563                 dev_kfree_skb_any(skb);
564         } else {
565                 dev->trans_start = jiffies;
566
567                 address->last_send = priv->tx_head;
568                 ++priv->tx_head;
569                 skb_orphan(skb);
570
571                 if (++priv->tx_outstanding == ipoib_sendq_size) {
572                         ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
573                         netif_stop_queue(dev);
574                 }
575         }
576
577         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
578                 poll_tx(priv);
579 }
580
581 static void __ipoib_reap_ah(struct net_device *dev)
582 {
583         struct ipoib_dev_priv *priv = netdev_priv(dev);
584         struct ipoib_ah *ah, *tah;
585         LIST_HEAD(remove_list);
586
587         spin_lock_irq(&priv->tx_lock);
588         spin_lock(&priv->lock);
589         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
590                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
591                         list_del(&ah->list);
592                         ib_destroy_ah(ah->ah);
593                         kfree(ah);
594                 }
595         spin_unlock(&priv->lock);
596         spin_unlock_irq(&priv->tx_lock);
597 }
598
599 void ipoib_reap_ah(struct work_struct *work)
600 {
601         struct ipoib_dev_priv *priv =
602                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
603         struct net_device *dev = priv->dev;
604
605         __ipoib_reap_ah(dev);
606
607         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
608                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
609                                    round_jiffies_relative(HZ));
610 }
611
612 int ipoib_ib_dev_open(struct net_device *dev)
613 {
614         struct ipoib_dev_priv *priv = netdev_priv(dev);
615         int ret;
616
617         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
618                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
619                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
620                 return -1;
621         }
622         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
623
624         ret = ipoib_init_qp(dev);
625         if (ret) {
626                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
627                 return -1;
628         }
629
630         ret = ipoib_ib_post_receives(dev);
631         if (ret) {
632                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
633                 ipoib_ib_dev_stop(dev, 1);
634                 return -1;
635         }
636
637         ret = ipoib_cm_dev_open(dev);
638         if (ret) {
639                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
640                 ipoib_ib_dev_stop(dev, 1);
641                 return -1;
642         }
643
644         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
645         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
646                            round_jiffies_relative(HZ));
647
648         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
649
650         return 0;
651 }
652
653 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
654 {
655         struct ipoib_dev_priv *priv = netdev_priv(dev);
656         u16 pkey_index = 0;
657
658         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
659                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
660         else
661                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
662 }
663
664 int ipoib_ib_dev_up(struct net_device *dev)
665 {
666         struct ipoib_dev_priv *priv = netdev_priv(dev);
667
668         ipoib_pkey_dev_check_presence(dev);
669
670         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
671                 ipoib_dbg(priv, "PKEY is not assigned.\n");
672                 return 0;
673         }
674
675         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
676
677         return ipoib_mcast_start_thread(dev);
678 }
679
680 int ipoib_ib_dev_down(struct net_device *dev, int flush)
681 {
682         struct ipoib_dev_priv *priv = netdev_priv(dev);
683
684         ipoib_dbg(priv, "downing ib_dev\n");
685
686         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
687         netif_carrier_off(dev);
688
689         /* Shutdown the P_Key thread if still active */
690         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
691                 mutex_lock(&pkey_mutex);
692                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
693                 cancel_delayed_work(&priv->pkey_poll_task);
694                 mutex_unlock(&pkey_mutex);
695                 if (flush)
696                         flush_workqueue(ipoib_workqueue);
697         }
698
699         ipoib_mcast_stop_thread(dev, flush);
700         ipoib_mcast_dev_flush(dev);
701
702         ipoib_flush_paths(dev);
703
704         return 0;
705 }
706
707 static int recvs_pending(struct net_device *dev)
708 {
709         struct ipoib_dev_priv *priv = netdev_priv(dev);
710         int pending = 0;
711         int i;
712
713         for (i = 0; i < ipoib_recvq_size; ++i)
714                 if (priv->rx_ring[i].skb)
715                         ++pending;
716
717         return pending;
718 }
719
720 void ipoib_drain_cq(struct net_device *dev)
721 {
722         struct ipoib_dev_priv *priv = netdev_priv(dev);
723         int i, n;
724         do {
725                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
726                 for (i = 0; i < n; ++i) {
727                         /*
728                          * Convert any successful completions to flush
729                          * errors to avoid passing packets up the
730                          * stack after bringing the device down.
731                          */
732                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
733                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
734
735                         if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
736                                 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
737                                         ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
738                                 else
739                                         ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
740                         } else
741                                 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
742                 }
743         } while (n == IPOIB_NUM_WC);
744
745         while (poll_tx(priv))
746                 ; /* nothing */
747 }
748
749 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
750 {
751         struct ipoib_dev_priv *priv = netdev_priv(dev);
752         struct ib_qp_attr qp_attr;
753         unsigned long begin;
754         struct ipoib_tx_buf *tx_req;
755         int i;
756
757         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
758
759         ipoib_cm_dev_stop(dev);
760
761         /*
762          * Move our QP to the error state and then reinitialize in
763          * when all work requests have completed or have been flushed.
764          */
765         qp_attr.qp_state = IB_QPS_ERR;
766         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
767                 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
768
769         /* Wait for all sends and receives to complete */
770         begin = jiffies;
771
772         while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
773                 if (time_after(jiffies, begin + 5 * HZ)) {
774                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
775                                    priv->tx_head - priv->tx_tail, recvs_pending(dev));
776
777                         /*
778                          * assume the HW is wedged and just free up
779                          * all our pending work requests.
780                          */
781                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
782                                 tx_req = &priv->tx_ring[priv->tx_tail &
783                                                         (ipoib_sendq_size - 1)];
784                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
785                                 dev_kfree_skb_any(tx_req->skb);
786                                 ++priv->tx_tail;
787                                 --priv->tx_outstanding;
788                         }
789
790                         for (i = 0; i < ipoib_recvq_size; ++i) {
791                                 struct ipoib_rx_buf *rx_req;
792
793                                 rx_req = &priv->rx_ring[i];
794                                 if (!rx_req->skb)
795                                         continue;
796                                 ipoib_ud_dma_unmap_rx(priv,
797                                                       priv->rx_ring[i].mapping);
798                                 dev_kfree_skb_any(rx_req->skb);
799                                 rx_req->skb = NULL;
800                         }
801
802                         goto timeout;
803                 }
804
805                 ipoib_drain_cq(dev);
806
807                 msleep(1);
808         }
809
810         ipoib_dbg(priv, "All sends and receives done.\n");
811
812 timeout:
813         qp_attr.qp_state = IB_QPS_RESET;
814         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
815                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
816
817         /* Wait for all AHs to be reaped */
818         set_bit(IPOIB_STOP_REAPER, &priv->flags);
819         cancel_delayed_work(&priv->ah_reap_task);
820         if (flush)
821                 flush_workqueue(ipoib_workqueue);
822
823         begin = jiffies;
824
825         while (!list_empty(&priv->dead_ahs)) {
826                 __ipoib_reap_ah(dev);
827
828                 if (time_after(jiffies, begin + HZ)) {
829                         ipoib_warn(priv, "timing out; will leak address handles\n");
830                         break;
831                 }
832
833                 msleep(1);
834         }
835
836         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
837
838         return 0;
839 }
840
841 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
842 {
843         struct ipoib_dev_priv *priv = netdev_priv(dev);
844
845         priv->ca = ca;
846         priv->port = port;
847         priv->qp = NULL;
848
849         if (ipoib_transport_dev_init(dev, ca)) {
850                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
851                 return -ENODEV;
852         }
853
854         if (dev->flags & IFF_UP) {
855                 if (ipoib_ib_dev_open(dev)) {
856                         ipoib_transport_dev_cleanup(dev);
857                         return -ENODEV;
858                 }
859         }
860
861         return 0;
862 }
863
864 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
865 {
866         struct ipoib_dev_priv *cpriv;
867         struct net_device *dev = priv->dev;
868         u16 new_index;
869
870         mutex_lock(&priv->vlan_mutex);
871
872         /*
873          * Flush any child interfaces too -- they might be up even if
874          * the parent is down.
875          */
876         list_for_each_entry(cpriv, &priv->child_intfs, list)
877                 __ipoib_ib_dev_flush(cpriv, pkey_event);
878
879         mutex_unlock(&priv->vlan_mutex);
880
881         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
882                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
883                 return;
884         }
885
886         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
887                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
888                 return;
889         }
890
891         if (pkey_event) {
892                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
893                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
894                         ipoib_ib_dev_down(dev, 0);
895                         ipoib_ib_dev_stop(dev, 0);
896                         if (ipoib_pkey_dev_delay_open(dev))
897                                 return;
898                 }
899
900                 /* restart QP only if P_Key index is changed */
901                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
902                     new_index == priv->pkey_index) {
903                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
904                         return;
905                 }
906                 priv->pkey_index = new_index;
907         }
908
909         ipoib_dbg(priv, "flushing\n");
910
911         ipoib_ib_dev_down(dev, 0);
912
913         if (pkey_event) {
914                 ipoib_ib_dev_stop(dev, 0);
915                 ipoib_ib_dev_open(dev);
916         }
917
918         /*
919          * The device could have been brought down between the start and when
920          * we get here, don't bring it back up if it's not configured up
921          */
922         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
923                 ipoib_ib_dev_up(dev);
924                 ipoib_mcast_restart_task(&priv->restart_task);
925         }
926 }
927
928 void ipoib_ib_dev_flush(struct work_struct *work)
929 {
930         struct ipoib_dev_priv *priv =
931                 container_of(work, struct ipoib_dev_priv, flush_task);
932
933         ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
934         __ipoib_ib_dev_flush(priv, 0);
935 }
936
937 void ipoib_pkey_event(struct work_struct *work)
938 {
939         struct ipoib_dev_priv *priv =
940                 container_of(work, struct ipoib_dev_priv, pkey_event_task);
941
942         ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
943         __ipoib_ib_dev_flush(priv, 1);
944 }
945
946 void ipoib_ib_dev_cleanup(struct net_device *dev)
947 {
948         struct ipoib_dev_priv *priv = netdev_priv(dev);
949
950         ipoib_dbg(priv, "cleaning up ib_dev\n");
951
952         ipoib_mcast_stop_thread(dev, 1);
953         ipoib_mcast_dev_flush(dev);
954
955         ipoib_transport_dev_cleanup(dev);
956 }
957
958 /*
959  * Delayed P_Key Assigment Interim Support
960  *
961  * The following is initial implementation of delayed P_Key assigment
962  * mechanism. It is using the same approach implemented for the multicast
963  * group join. The single goal of this implementation is to quickly address
964  * Bug #2507. This implementation will probably be removed when the P_Key
965  * change async notification is available.
966  */
967
968 void ipoib_pkey_poll(struct work_struct *work)
969 {
970         struct ipoib_dev_priv *priv =
971                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
972         struct net_device *dev = priv->dev;
973
974         ipoib_pkey_dev_check_presence(dev);
975
976         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
977                 ipoib_open(dev);
978         else {
979                 mutex_lock(&pkey_mutex);
980                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
981                         queue_delayed_work(ipoib_workqueue,
982                                            &priv->pkey_poll_task,
983                                            HZ);
984                 mutex_unlock(&pkey_mutex);
985         }
986 }
987
988 int ipoib_pkey_dev_delay_open(struct net_device *dev)
989 {
990         struct ipoib_dev_priv *priv = netdev_priv(dev);
991
992         /* Look for the interface pkey value in the IB Port P_Key table and */
993         /* set the interface pkey assigment flag                            */
994         ipoib_pkey_dev_check_presence(dev);
995
996         /* P_Key value not assigned yet - start polling */
997         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
998                 mutex_lock(&pkey_mutex);
999                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1000                 queue_delayed_work(ipoib_workqueue,
1001                                    &priv->pkey_poll_task,
1002                                    HZ);
1003                 mutex_unlock(&pkey_mutex);
1004                 return 1;
1005         }
1006
1007         return 0;
1008 }