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IPoIB: Fix TX queue lockup with mixed UD/CM traffic
[deliverable/linux.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
36 #include <linux/delay.h>
37 #include <linux/dma-mapping.h>
38
39 #include <linux/ip.h>
40 #include <linux/tcp.h>
41
42 #include "ipoib.h"
43
44 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
45 static int data_debug_level;
46
47 module_param(data_debug_level, int, 0644);
48 MODULE_PARM_DESC(data_debug_level,
49 "Enable data path debug tracing if > 0");
50 #endif
51
52 static DEFINE_MUTEX(pkey_mutex);
53
54 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
55 struct ib_pd *pd, struct ib_ah_attr *attr)
56 {
57 struct ipoib_ah *ah;
58
59 ah = kmalloc(sizeof *ah, GFP_KERNEL);
60 if (!ah)
61 return NULL;
62
63 ah->dev = dev;
64 ah->last_send = 0;
65 kref_init(&ah->ref);
66
67 ah->ah = ib_create_ah(pd, attr);
68 if (IS_ERR(ah->ah)) {
69 kfree(ah);
70 ah = NULL;
71 } else
72 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
73
74 return ah;
75 }
76
77 void ipoib_free_ah(struct kref *kref)
78 {
79 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
80 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
81
82 unsigned long flags;
83
84 spin_lock_irqsave(&priv->lock, flags);
85 list_add_tail(&ah->list, &priv->dead_ahs);
86 spin_unlock_irqrestore(&priv->lock, flags);
87 }
88
89 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
90 u64 mapping[IPOIB_UD_RX_SG])
91 {
92 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
93 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
94 DMA_FROM_DEVICE);
95 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
96 DMA_FROM_DEVICE);
97 } else
98 ib_dma_unmap_single(priv->ca, mapping[0],
99 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
100 DMA_FROM_DEVICE);
101 }
102
103 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
104 struct sk_buff *skb,
105 unsigned int length)
106 {
107 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
108 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
109 unsigned int size;
110 /*
111 * There is only two buffers needed for max_payload = 4K,
112 * first buf size is IPOIB_UD_HEAD_SIZE
113 */
114 skb->tail += IPOIB_UD_HEAD_SIZE;
115 skb->len += length;
116
117 size = length - IPOIB_UD_HEAD_SIZE;
118
119 frag->size = size;
120 skb->data_len += size;
121 skb->truesize += size;
122 } else
123 skb_put(skb, length);
124
125 }
126
127 static int ipoib_ib_post_receive(struct net_device *dev, int id)
128 {
129 struct ipoib_dev_priv *priv = netdev_priv(dev);
130 struct ib_recv_wr *bad_wr;
131 int ret;
132
133 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
134 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
135 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
136
137
138 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
139 if (unlikely(ret)) {
140 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
141 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
142 dev_kfree_skb_any(priv->rx_ring[id].skb);
143 priv->rx_ring[id].skb = NULL;
144 }
145
146 return ret;
147 }
148
149 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
150 {
151 struct ipoib_dev_priv *priv = netdev_priv(dev);
152 struct sk_buff *skb;
153 int buf_size;
154 u64 *mapping;
155
156 if (ipoib_ud_need_sg(priv->max_ib_mtu))
157 buf_size = IPOIB_UD_HEAD_SIZE;
158 else
159 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
160
161 skb = dev_alloc_skb(buf_size + 4);
162 if (unlikely(!skb))
163 return NULL;
164
165 /*
166 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
167 * header. So we need 4 more bytes to get to 48 and align the
168 * IP header to a multiple of 16.
169 */
170 skb_reserve(skb, 4);
171
172 mapping = priv->rx_ring[id].mapping;
173 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
174 DMA_FROM_DEVICE);
175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
176 goto error;
177
178 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
179 struct page *page = alloc_page(GFP_ATOMIC);
180 if (!page)
181 goto partial_error;
182 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
183 mapping[1] =
184 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
185 0, PAGE_SIZE, DMA_FROM_DEVICE);
186 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
187 goto partial_error;
188 }
189
190 priv->rx_ring[id].skb = skb;
191 return skb;
192
193 partial_error:
194 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
195 error:
196 dev_kfree_skb_any(skb);
197 return NULL;
198 }
199
200 static int ipoib_ib_post_receives(struct net_device *dev)
201 {
202 struct ipoib_dev_priv *priv = netdev_priv(dev);
203 int i;
204
205 for (i = 0; i < ipoib_recvq_size; ++i) {
206 if (!ipoib_alloc_rx_skb(dev, i)) {
207 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
208 return -ENOMEM;
209 }
210 if (ipoib_ib_post_receive(dev, i)) {
211 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
212 return -EIO;
213 }
214 }
215
216 return 0;
217 }
218
219 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
220 {
221 struct ipoib_dev_priv *priv = netdev_priv(dev);
222 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
223 struct sk_buff *skb;
224 u64 mapping[IPOIB_UD_RX_SG];
225
226 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
227 wr_id, wc->status);
228
229 if (unlikely(wr_id >= ipoib_recvq_size)) {
230 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
231 wr_id, ipoib_recvq_size);
232 return;
233 }
234
235 skb = priv->rx_ring[wr_id].skb;
236
237 if (unlikely(wc->status != IB_WC_SUCCESS)) {
238 if (wc->status != IB_WC_WR_FLUSH_ERR)
239 ipoib_warn(priv, "failed recv event "
240 "(status=%d, wrid=%d vend_err %x)\n",
241 wc->status, wr_id, wc->vendor_err);
242 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
243 dev_kfree_skb_any(skb);
244 priv->rx_ring[wr_id].skb = NULL;
245 return;
246 }
247
248 /*
249 * Drop packets that this interface sent, ie multicast packets
250 * that the HCA has replicated.
251 */
252 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
253 goto repost;
254
255 memcpy(mapping, priv->rx_ring[wr_id].mapping,
256 IPOIB_UD_RX_SG * sizeof *mapping);
257
258 /*
259 * If we can't allocate a new RX buffer, dump
260 * this packet and reuse the old buffer.
261 */
262 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
263 ++dev->stats.rx_dropped;
264 goto repost;
265 }
266
267 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
268 wc->byte_len, wc->slid);
269
270 ipoib_ud_dma_unmap_rx(priv, mapping);
271 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
272
273 skb_pull(skb, IB_GRH_BYTES);
274
275 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
276 skb_reset_mac_header(skb);
277 skb_pull(skb, IPOIB_ENCAP_LEN);
278
279 ++dev->stats.rx_packets;
280 dev->stats.rx_bytes += skb->len;
281
282 skb->dev = dev;
283 /* XXX get correct PACKET_ type here */
284 skb->pkt_type = PACKET_HOST;
285
286 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
287 skb->ip_summed = CHECKSUM_UNNECESSARY;
288
289 if (dev->features & NETIF_F_LRO)
290 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL);
291 else
292 netif_receive_skb(skb);
293
294 repost:
295 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
296 ipoib_warn(priv, "ipoib_ib_post_receive failed "
297 "for buf %d\n", wr_id);
298 }
299
300 static int ipoib_dma_map_tx(struct ib_device *ca,
301 struct ipoib_tx_buf *tx_req)
302 {
303 struct sk_buff *skb = tx_req->skb;
304 u64 *mapping = tx_req->mapping;
305 int i;
306 int off;
307
308 if (skb_headlen(skb)) {
309 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
310 DMA_TO_DEVICE);
311 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
312 return -EIO;
313
314 off = 1;
315 } else
316 off = 0;
317
318 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
319 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
320 mapping[i + off] = ib_dma_map_page(ca, frag->page,
321 frag->page_offset, frag->size,
322 DMA_TO_DEVICE);
323 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
324 goto partial_error;
325 }
326 return 0;
327
328 partial_error:
329 for (; i > 0; --i) {
330 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
331 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
332 }
333
334 if (off)
335 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
336
337 return -EIO;
338 }
339
340 static void ipoib_dma_unmap_tx(struct ib_device *ca,
341 struct ipoib_tx_buf *tx_req)
342 {
343 struct sk_buff *skb = tx_req->skb;
344 u64 *mapping = tx_req->mapping;
345 int i;
346 int off;
347
348 if (skb_headlen(skb)) {
349 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
350 off = 1;
351 } else
352 off = 0;
353
354 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
355 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
356 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
357 DMA_TO_DEVICE);
358 }
359 }
360
361 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
362 {
363 struct ipoib_dev_priv *priv = netdev_priv(dev);
364 unsigned int wr_id = wc->wr_id;
365 struct ipoib_tx_buf *tx_req;
366
367 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
368 wr_id, wc->status);
369
370 if (unlikely(wr_id >= ipoib_sendq_size)) {
371 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
372 wr_id, ipoib_sendq_size);
373 return;
374 }
375
376 tx_req = &priv->tx_ring[wr_id];
377
378 ipoib_dma_unmap_tx(priv->ca, tx_req);
379
380 ++dev->stats.tx_packets;
381 dev->stats.tx_bytes += tx_req->skb->len;
382
383 dev_kfree_skb_any(tx_req->skb);
384
385 ++priv->tx_tail;
386 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
387 netif_queue_stopped(dev) &&
388 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
389 netif_wake_queue(dev);
390
391 if (wc->status != IB_WC_SUCCESS &&
392 wc->status != IB_WC_WR_FLUSH_ERR)
393 ipoib_warn(priv, "failed send event "
394 "(status=%d, wrid=%d vend_err %x)\n",
395 wc->status, wr_id, wc->vendor_err);
396 }
397
398 static int poll_tx(struct ipoib_dev_priv *priv)
399 {
400 int n, i;
401
402 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
403 for (i = 0; i < n; ++i)
404 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
405
406 return n == MAX_SEND_CQE;
407 }
408
409 int ipoib_poll(struct napi_struct *napi, int budget)
410 {
411 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
412 struct net_device *dev = priv->dev;
413 int done;
414 int t;
415 int n, i;
416
417 done = 0;
418
419 poll_more:
420 while (done < budget) {
421 int max = (budget - done);
422
423 t = min(IPOIB_NUM_WC, max);
424 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
425
426 for (i = 0; i < n; i++) {
427 struct ib_wc *wc = priv->ibwc + i;
428
429 if (wc->wr_id & IPOIB_OP_RECV) {
430 ++done;
431 if (wc->wr_id & IPOIB_OP_CM)
432 ipoib_cm_handle_rx_wc(dev, wc);
433 else
434 ipoib_ib_handle_rx_wc(dev, wc);
435 } else
436 ipoib_cm_handle_tx_wc(priv->dev, wc);
437 }
438
439 if (n != t)
440 break;
441 }
442
443 if (done < budget) {
444 if (dev->features & NETIF_F_LRO)
445 lro_flush_all(&priv->lro.lro_mgr);
446
447 napi_complete(napi);
448 if (unlikely(ib_req_notify_cq(priv->recv_cq,
449 IB_CQ_NEXT_COMP |
450 IB_CQ_REPORT_MISSED_EVENTS)) &&
451 napi_reschedule(napi))
452 goto poll_more;
453 }
454
455 return done;
456 }
457
458 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
459 {
460 struct net_device *dev = dev_ptr;
461 struct ipoib_dev_priv *priv = netdev_priv(dev);
462
463 napi_schedule(&priv->napi);
464 }
465
466 static void drain_tx_cq(struct net_device *dev)
467 {
468 struct ipoib_dev_priv *priv = netdev_priv(dev);
469
470 netif_tx_lock(dev);
471 while (poll_tx(priv))
472 ; /* nothing */
473
474 if (netif_queue_stopped(dev))
475 mod_timer(&priv->poll_timer, jiffies + 1);
476
477 netif_tx_unlock(dev);
478 }
479
480 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
481 {
482 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
483
484 mod_timer(&priv->poll_timer, jiffies);
485 }
486
487 static inline int post_send(struct ipoib_dev_priv *priv,
488 unsigned int wr_id,
489 struct ib_ah *address, u32 qpn,
490 struct ipoib_tx_buf *tx_req,
491 void *head, int hlen)
492 {
493 struct ib_send_wr *bad_wr;
494 int i, off;
495 struct sk_buff *skb = tx_req->skb;
496 skb_frag_t *frags = skb_shinfo(skb)->frags;
497 int nr_frags = skb_shinfo(skb)->nr_frags;
498 u64 *mapping = tx_req->mapping;
499
500 if (skb_headlen(skb)) {
501 priv->tx_sge[0].addr = mapping[0];
502 priv->tx_sge[0].length = skb_headlen(skb);
503 off = 1;
504 } else
505 off = 0;
506
507 for (i = 0; i < nr_frags; ++i) {
508 priv->tx_sge[i + off].addr = mapping[i + off];
509 priv->tx_sge[i + off].length = frags[i].size;
510 }
511 priv->tx_wr.num_sge = nr_frags + off;
512 priv->tx_wr.wr_id = wr_id;
513 priv->tx_wr.wr.ud.remote_qpn = qpn;
514 priv->tx_wr.wr.ud.ah = address;
515
516 if (head) {
517 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
518 priv->tx_wr.wr.ud.header = head;
519 priv->tx_wr.wr.ud.hlen = hlen;
520 priv->tx_wr.opcode = IB_WR_LSO;
521 } else
522 priv->tx_wr.opcode = IB_WR_SEND;
523
524 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
525 }
526
527 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
528 struct ipoib_ah *address, u32 qpn)
529 {
530 struct ipoib_dev_priv *priv = netdev_priv(dev);
531 struct ipoib_tx_buf *tx_req;
532 int hlen;
533 void *phead;
534
535 if (skb_is_gso(skb)) {
536 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
537 phead = skb->data;
538 if (unlikely(!skb_pull(skb, hlen))) {
539 ipoib_warn(priv, "linear data too small\n");
540 ++dev->stats.tx_dropped;
541 ++dev->stats.tx_errors;
542 dev_kfree_skb_any(skb);
543 return;
544 }
545 } else {
546 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
547 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
548 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
549 ++dev->stats.tx_dropped;
550 ++dev->stats.tx_errors;
551 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
552 return;
553 }
554 phead = NULL;
555 hlen = 0;
556 }
557
558 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
559 skb->len, address, qpn);
560
561 /*
562 * We put the skb into the tx_ring _before_ we call post_send()
563 * because it's entirely possible that the completion handler will
564 * run before we execute anything after the post_send(). That
565 * means we have to make sure everything is properly recorded and
566 * our state is consistent before we call post_send().
567 */
568 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
569 tx_req->skb = skb;
570 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
571 ++dev->stats.tx_errors;
572 dev_kfree_skb_any(skb);
573 return;
574 }
575
576 if (skb->ip_summed == CHECKSUM_PARTIAL)
577 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
578 else
579 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
580
581 if (++priv->tx_outstanding == ipoib_sendq_size) {
582 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
583 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
584 ipoib_warn(priv, "request notify on send CQ failed\n");
585 netif_stop_queue(dev);
586 }
587
588 if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
589 address->ah, qpn, tx_req, phead, hlen))) {
590 ipoib_warn(priv, "post_send failed\n");
591 ++dev->stats.tx_errors;
592 --priv->tx_outstanding;
593 ipoib_dma_unmap_tx(priv->ca, tx_req);
594 dev_kfree_skb_any(skb);
595 if (netif_queue_stopped(dev))
596 netif_wake_queue(dev);
597 } else {
598 dev->trans_start = jiffies;
599
600 address->last_send = priv->tx_head;
601 ++priv->tx_head;
602 skb_orphan(skb);
603
604 }
605
606 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
607 while (poll_tx(priv))
608 ; /* nothing */
609 }
610
611 static void __ipoib_reap_ah(struct net_device *dev)
612 {
613 struct ipoib_dev_priv *priv = netdev_priv(dev);
614 struct ipoib_ah *ah, *tah;
615 LIST_HEAD(remove_list);
616 unsigned long flags;
617
618 netif_tx_lock_bh(dev);
619 spin_lock_irqsave(&priv->lock, flags);
620
621 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
622 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
623 list_del(&ah->list);
624 ib_destroy_ah(ah->ah);
625 kfree(ah);
626 }
627
628 spin_unlock_irqrestore(&priv->lock, flags);
629 netif_tx_unlock_bh(dev);
630 }
631
632 void ipoib_reap_ah(struct work_struct *work)
633 {
634 struct ipoib_dev_priv *priv =
635 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
636 struct net_device *dev = priv->dev;
637
638 __ipoib_reap_ah(dev);
639
640 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
641 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
642 round_jiffies_relative(HZ));
643 }
644
645 static void ipoib_ib_tx_timer_func(unsigned long ctx)
646 {
647 drain_tx_cq((struct net_device *)ctx);
648 }
649
650 int ipoib_ib_dev_open(struct net_device *dev)
651 {
652 struct ipoib_dev_priv *priv = netdev_priv(dev);
653 int ret;
654
655 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
656 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
657 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
658 return -1;
659 }
660 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
661
662 ret = ipoib_init_qp(dev);
663 if (ret) {
664 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
665 return -1;
666 }
667
668 ret = ipoib_ib_post_receives(dev);
669 if (ret) {
670 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
671 ipoib_ib_dev_stop(dev, 1);
672 return -1;
673 }
674
675 ret = ipoib_cm_dev_open(dev);
676 if (ret) {
677 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
678 ipoib_ib_dev_stop(dev, 1);
679 return -1;
680 }
681
682 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
683 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
684 round_jiffies_relative(HZ));
685
686 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
687 napi_enable(&priv->napi);
688
689 return 0;
690 }
691
692 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
693 {
694 struct ipoib_dev_priv *priv = netdev_priv(dev);
695 u16 pkey_index = 0;
696
697 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
698 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
699 else
700 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
701 }
702
703 int ipoib_ib_dev_up(struct net_device *dev)
704 {
705 struct ipoib_dev_priv *priv = netdev_priv(dev);
706
707 ipoib_pkey_dev_check_presence(dev);
708
709 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
710 ipoib_dbg(priv, "PKEY is not assigned.\n");
711 return 0;
712 }
713
714 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
715
716 return ipoib_mcast_start_thread(dev);
717 }
718
719 int ipoib_ib_dev_down(struct net_device *dev, int flush)
720 {
721 struct ipoib_dev_priv *priv = netdev_priv(dev);
722
723 ipoib_dbg(priv, "downing ib_dev\n");
724
725 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
726 netif_carrier_off(dev);
727
728 /* Shutdown the P_Key thread if still active */
729 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
730 mutex_lock(&pkey_mutex);
731 set_bit(IPOIB_PKEY_STOP, &priv->flags);
732 cancel_delayed_work(&priv->pkey_poll_task);
733 mutex_unlock(&pkey_mutex);
734 if (flush)
735 flush_workqueue(ipoib_workqueue);
736 }
737
738 ipoib_mcast_stop_thread(dev, flush);
739 ipoib_mcast_dev_flush(dev);
740
741 ipoib_flush_paths(dev);
742
743 return 0;
744 }
745
746 static int recvs_pending(struct net_device *dev)
747 {
748 struct ipoib_dev_priv *priv = netdev_priv(dev);
749 int pending = 0;
750 int i;
751
752 for (i = 0; i < ipoib_recvq_size; ++i)
753 if (priv->rx_ring[i].skb)
754 ++pending;
755
756 return pending;
757 }
758
759 void ipoib_drain_cq(struct net_device *dev)
760 {
761 struct ipoib_dev_priv *priv = netdev_priv(dev);
762 int i, n;
763
764 /*
765 * We call completion handling routines that expect to be
766 * called from the BH-disabled NAPI poll context, so disable
767 * BHs here too.
768 */
769 local_bh_disable();
770
771 do {
772 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
773 for (i = 0; i < n; ++i) {
774 /*
775 * Convert any successful completions to flush
776 * errors to avoid passing packets up the
777 * stack after bringing the device down.
778 */
779 if (priv->ibwc[i].status == IB_WC_SUCCESS)
780 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
781
782 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
783 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
784 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
785 else
786 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
787 } else
788 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
789 }
790 } while (n == IPOIB_NUM_WC);
791
792 while (poll_tx(priv))
793 ; /* nothing */
794
795 local_bh_enable();
796 }
797
798 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
799 {
800 struct ipoib_dev_priv *priv = netdev_priv(dev);
801 struct ib_qp_attr qp_attr;
802 unsigned long begin;
803 struct ipoib_tx_buf *tx_req;
804 int i;
805
806 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
807 napi_disable(&priv->napi);
808
809 ipoib_cm_dev_stop(dev);
810
811 /*
812 * Move our QP to the error state and then reinitialize in
813 * when all work requests have completed or have been flushed.
814 */
815 qp_attr.qp_state = IB_QPS_ERR;
816 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
817 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
818
819 /* Wait for all sends and receives to complete */
820 begin = jiffies;
821
822 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
823 if (time_after(jiffies, begin + 5 * HZ)) {
824 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
825 priv->tx_head - priv->tx_tail, recvs_pending(dev));
826
827 /*
828 * assume the HW is wedged and just free up
829 * all our pending work requests.
830 */
831 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
832 tx_req = &priv->tx_ring[priv->tx_tail &
833 (ipoib_sendq_size - 1)];
834 ipoib_dma_unmap_tx(priv->ca, tx_req);
835 dev_kfree_skb_any(tx_req->skb);
836 ++priv->tx_tail;
837 --priv->tx_outstanding;
838 }
839
840 for (i = 0; i < ipoib_recvq_size; ++i) {
841 struct ipoib_rx_buf *rx_req;
842
843 rx_req = &priv->rx_ring[i];
844 if (!rx_req->skb)
845 continue;
846 ipoib_ud_dma_unmap_rx(priv,
847 priv->rx_ring[i].mapping);
848 dev_kfree_skb_any(rx_req->skb);
849 rx_req->skb = NULL;
850 }
851
852 goto timeout;
853 }
854
855 ipoib_drain_cq(dev);
856
857 msleep(1);
858 }
859
860 ipoib_dbg(priv, "All sends and receives done.\n");
861
862 timeout:
863 del_timer_sync(&priv->poll_timer);
864 qp_attr.qp_state = IB_QPS_RESET;
865 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
866 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
867
868 /* Wait for all AHs to be reaped */
869 set_bit(IPOIB_STOP_REAPER, &priv->flags);
870 cancel_delayed_work(&priv->ah_reap_task);
871 if (flush)
872 flush_workqueue(ipoib_workqueue);
873
874 begin = jiffies;
875
876 while (!list_empty(&priv->dead_ahs)) {
877 __ipoib_reap_ah(dev);
878
879 if (time_after(jiffies, begin + HZ)) {
880 ipoib_warn(priv, "timing out; will leak address handles\n");
881 break;
882 }
883
884 msleep(1);
885 }
886
887 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
888
889 return 0;
890 }
891
892 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
893 {
894 struct ipoib_dev_priv *priv = netdev_priv(dev);
895
896 priv->ca = ca;
897 priv->port = port;
898 priv->qp = NULL;
899
900 if (ipoib_transport_dev_init(dev, ca)) {
901 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
902 return -ENODEV;
903 }
904
905 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
906 (unsigned long) dev);
907
908 if (dev->flags & IFF_UP) {
909 if (ipoib_ib_dev_open(dev)) {
910 ipoib_transport_dev_cleanup(dev);
911 return -ENODEV;
912 }
913 }
914
915 return 0;
916 }
917
918 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
919 enum ipoib_flush_level level)
920 {
921 struct ipoib_dev_priv *cpriv;
922 struct net_device *dev = priv->dev;
923 u16 new_index;
924
925 mutex_lock(&priv->vlan_mutex);
926
927 /*
928 * Flush any child interfaces too -- they might be up even if
929 * the parent is down.
930 */
931 list_for_each_entry(cpriv, &priv->child_intfs, list)
932 __ipoib_ib_dev_flush(cpriv, level);
933
934 mutex_unlock(&priv->vlan_mutex);
935
936 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
937 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
938 return;
939 }
940
941 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
942 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
943 return;
944 }
945
946 if (level == IPOIB_FLUSH_HEAVY) {
947 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
948 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
949 ipoib_ib_dev_down(dev, 0);
950 ipoib_ib_dev_stop(dev, 0);
951 if (ipoib_pkey_dev_delay_open(dev))
952 return;
953 }
954
955 /* restart QP only if P_Key index is changed */
956 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
957 new_index == priv->pkey_index) {
958 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
959 return;
960 }
961 priv->pkey_index = new_index;
962 }
963
964 if (level == IPOIB_FLUSH_LIGHT) {
965 ipoib_mark_paths_invalid(dev);
966 ipoib_mcast_dev_flush(dev);
967 }
968
969 if (level >= IPOIB_FLUSH_NORMAL)
970 ipoib_ib_dev_down(dev, 0);
971
972 if (level == IPOIB_FLUSH_HEAVY) {
973 ipoib_ib_dev_stop(dev, 0);
974 ipoib_ib_dev_open(dev);
975 }
976
977 /*
978 * The device could have been brought down between the start and when
979 * we get here, don't bring it back up if it's not configured up
980 */
981 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
982 if (level >= IPOIB_FLUSH_NORMAL)
983 ipoib_ib_dev_up(dev);
984 ipoib_mcast_restart_task(&priv->restart_task);
985 }
986 }
987
988 void ipoib_ib_dev_flush_light(struct work_struct *work)
989 {
990 struct ipoib_dev_priv *priv =
991 container_of(work, struct ipoib_dev_priv, flush_light);
992
993 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
994 }
995
996 void ipoib_ib_dev_flush_normal(struct work_struct *work)
997 {
998 struct ipoib_dev_priv *priv =
999 container_of(work, struct ipoib_dev_priv, flush_normal);
1000
1001 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1002 }
1003
1004 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1005 {
1006 struct ipoib_dev_priv *priv =
1007 container_of(work, struct ipoib_dev_priv, flush_heavy);
1008
1009 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1010 }
1011
1012 void ipoib_ib_dev_cleanup(struct net_device *dev)
1013 {
1014 struct ipoib_dev_priv *priv = netdev_priv(dev);
1015
1016 ipoib_dbg(priv, "cleaning up ib_dev\n");
1017
1018 ipoib_mcast_stop_thread(dev, 1);
1019 ipoib_mcast_dev_flush(dev);
1020
1021 ipoib_transport_dev_cleanup(dev);
1022 }
1023
1024 /*
1025 * Delayed P_Key Assigment Interim Support
1026 *
1027 * The following is initial implementation of delayed P_Key assigment
1028 * mechanism. It is using the same approach implemented for the multicast
1029 * group join. The single goal of this implementation is to quickly address
1030 * Bug #2507. This implementation will probably be removed when the P_Key
1031 * change async notification is available.
1032 */
1033
1034 void ipoib_pkey_poll(struct work_struct *work)
1035 {
1036 struct ipoib_dev_priv *priv =
1037 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1038 struct net_device *dev = priv->dev;
1039
1040 ipoib_pkey_dev_check_presence(dev);
1041
1042 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1043 ipoib_open(dev);
1044 else {
1045 mutex_lock(&pkey_mutex);
1046 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1047 queue_delayed_work(ipoib_workqueue,
1048 &priv->pkey_poll_task,
1049 HZ);
1050 mutex_unlock(&pkey_mutex);
1051 }
1052 }
1053
1054 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1055 {
1056 struct ipoib_dev_priv *priv = netdev_priv(dev);
1057
1058 /* Look for the interface pkey value in the IB Port P_Key table and */
1059 /* set the interface pkey assigment flag */
1060 ipoib_pkey_dev_check_presence(dev);
1061
1062 /* P_Key value not assigned yet - start polling */
1063 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1064 mutex_lock(&pkey_mutex);
1065 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1066 queue_delayed_work(ipoib_workqueue,
1067 &priv->pkey_poll_task,
1068 HZ);
1069 mutex_unlock(&pkey_mutex);
1070 return 1;
1071 }
1072
1073 return 0;
1074 }
Linux kernel - Deliverables
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