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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
blob785bc8505f2afc015ec45c45525c754ffcbf9bfc
1 /*
2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id$
33 */
34
35 #include <rdma/ib_cm.h>
36 #include <rdma/ib_cache.h>
37 #include <net/dst.h>
38 #include <net/icmp.h>
39 #include <linux/icmpv6.h>
40
41 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
42 static int data_debug_level;
43
44 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
45 MODULE_PARM_DESC(cm_data_debug_level,
46 "Enable data path debug tracing for connected mode if > 0");
47 #endif
48
49 #include "ipoib.h"
50
51 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
52
53 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
54 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
55 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
56 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
57
58 struct ipoib_cm_id {
59 struct ib_cm_id *id;
60 int flags;
61 u32 remote_qpn;
62 u32 remote_mtu;
63 };
64
65 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
66 struct ib_cm_event *event);
67
68 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
69 u64 mapping[IPOIB_CM_RX_SG])
70 {
71 int i;
72
73 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
74
75 for (i = 0; i < frags; ++i)
76 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
77 }
78
79 static int ipoib_cm_post_receive(struct net_device *dev, int id)
80 {
81 struct ipoib_dev_priv *priv = netdev_priv(dev);
82 struct ib_recv_wr *bad_wr;
83 int i, ret;
84
85 priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
86
87 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
88 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
89
90 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
91 if (unlikely(ret)) {
92 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
93 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
94 priv->cm.srq_ring[id].mapping);
95 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
96 priv->cm.srq_ring[id].skb = NULL;
97 }
98
99 return ret;
100 }
101
102 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
103 u64 mapping[IPOIB_CM_RX_SG])
104 {
105 struct ipoib_dev_priv *priv = netdev_priv(dev);
106 struct sk_buff *skb;
107 int i;
108
109 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
110 if (unlikely(!skb))
111 return NULL;
112
113 /*
114 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
115 * IP header to a multiple of 16.
116 */
117 skb_reserve(skb, 12);
118
119 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
120 DMA_FROM_DEVICE);
121 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
122 dev_kfree_skb_any(skb);
123 return NULL;
124 }
125
126 for (i = 0; i < frags; i++) {
127 struct page *page = alloc_page(GFP_ATOMIC);
128
129 if (!page)
130 goto partial_error;
131 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
132
133 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
134 0, PAGE_SIZE, DMA_FROM_DEVICE);
135 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
136 goto partial_error;
137 }
138
139 priv->cm.srq_ring[id].skb = skb;
140 return skb;
141
142 partial_error:
143
144 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
145
146 for (; i >= 0; --i)
147 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
148
149 dev_kfree_skb_any(skb);
150 return NULL;
151 }
152
153 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
154 struct ipoib_cm_rx *p)
155 {
156 struct ipoib_dev_priv *priv = netdev_priv(dev);
157 struct ib_qp_init_attr attr = {
158 .send_cq = priv->cq, /* does not matter, we never send anything */
159 .recv_cq = priv->cq,
160 .srq = priv->cm.srq,
161 .cap.max_send_wr = 1, /* FIXME: 0 Seems not to work */
162 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
163 .sq_sig_type = IB_SIGNAL_ALL_WR,
164 .qp_type = IB_QPT_RC,
165 .qp_context = p,
166 };
167 return ib_create_qp(priv->pd, &attr);
168 }
169
170 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
171 struct ib_cm_id *cm_id, struct ib_qp *qp,
172 unsigned psn)
173 {
174 struct ipoib_dev_priv *priv = netdev_priv(dev);
175 struct ib_qp_attr qp_attr;
176 int qp_attr_mask, ret;
177
178 qp_attr.qp_state = IB_QPS_INIT;
179 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
180 if (ret) {
181 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
182 return ret;
183 }
184 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
185 if (ret) {
186 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
187 return ret;
188 }
189 qp_attr.qp_state = IB_QPS_RTR;
190 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
191 if (ret) {
192 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
193 return ret;
194 }
195 qp_attr.rq_psn = psn;
196 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
197 if (ret) {
198 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
199 return ret;
200 }
201 return 0;
202 }
203
204 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
205 struct ib_qp *qp, struct ib_cm_req_event_param *req,
206 unsigned psn)
207 {
208 struct ipoib_dev_priv *priv = netdev_priv(dev);
209 struct ipoib_cm_data data = {};
210 struct ib_cm_rep_param rep = {};
211
212 data.qpn = cpu_to_be32(priv->qp->qp_num);
213 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
214
215 rep.private_data = &data;
216 rep.private_data_len = sizeof data;
217 rep.flow_control = 0;
218 rep.rnr_retry_count = req->rnr_retry_count;
219 rep.target_ack_delay = 20; /* FIXME */
220 rep.srq = 1;
221 rep.qp_num = qp->qp_num;
222 rep.starting_psn = psn;
223 return ib_send_cm_rep(cm_id, &rep);
224 }
225
226 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
227 {
228 struct net_device *dev = cm_id->context;
229 struct ipoib_dev_priv *priv = netdev_priv(dev);
230 struct ipoib_cm_rx *p;
231 unsigned psn;
232 int ret;
233
234 ipoib_dbg(priv, "REQ arrived\n");
235 p = kzalloc(sizeof *p, GFP_KERNEL);
236 if (!p)
237 return -ENOMEM;
238 p->dev = dev;
239 p->id = cm_id;
240 p->qp = ipoib_cm_create_rx_qp(dev, p);
241 if (IS_ERR(p->qp)) {
242 ret = PTR_ERR(p->qp);
243 goto err_qp;
244 }
245
246 psn = random32() & 0xffffff;
247 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
248 if (ret)
249 goto err_modify;
250
251 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
252 if (ret) {
253 ipoib_warn(priv, "failed to send REP: %d\n", ret);
254 goto err_rep;
255 }
256
257 cm_id->context = p;
258 p->jiffies = jiffies;
259 spin_lock_irq(&priv->lock);
260 list_add(&p->list, &priv->cm.passive_ids);
261 spin_unlock_irq(&priv->lock);
262 queue_delayed_work(ipoib_workqueue,
263 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
264 return 0;
265
266 err_rep:
267 err_modify:
268 ib_destroy_qp(p->qp);
269 err_qp:
270 kfree(p);
271 return ret;
272 }
273
274 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
275 struct ib_cm_event *event)
276 {
277 struct ipoib_cm_rx *p;
278 struct ipoib_dev_priv *priv;
279 int ret;
280
281 switch (event->event) {
282 case IB_CM_REQ_RECEIVED:
283 return ipoib_cm_req_handler(cm_id, event);
284 case IB_CM_DREQ_RECEIVED:
285 p = cm_id->context;
286 ib_send_cm_drep(cm_id, NULL, 0);
287 /* Fall through */
288 case IB_CM_REJ_RECEIVED:
289 p = cm_id->context;
290 priv = netdev_priv(p->dev);
291 spin_lock_irq(&priv->lock);
292 if (list_empty(&p->list))
293 ret = 0; /* Connection is going away already. */
294 else {
295 list_del_init(&p->list);
296 ret = -ECONNRESET;
297 }
298 spin_unlock_irq(&priv->lock);
299 if (ret) {
300 ib_destroy_qp(p->qp);
301 kfree(p);
302 return ret;
303 }
304 return 0;
305 default:
306 return 0;
307 }
308 }
309 /* Adjust length of skb with fragments to match received data */
310 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
311 unsigned int length, struct sk_buff *toskb)
312 {
313 int i, num_frags;
314 unsigned int size;
315
316 /* put header into skb */
317 size = min(length, hdr_space);
318 skb->tail += size;
319 skb->len += size;
320 length -= size;
321
322 num_frags = skb_shinfo(skb)->nr_frags;
323 for (i = 0; i < num_frags; i++) {
324 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
325
326 if (length == 0) {
327 /* don't need this page */
328 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
329 --skb_shinfo(skb)->nr_frags;
330 } else {
331 size = min(length, (unsigned) PAGE_SIZE);
332
333 frag->size = size;
334 skb->data_len += size;
335 skb->truesize += size;
336 skb->len += size;
337 length -= size;
338 }
339 }
340 }
341
342 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
343 {
344 struct ipoib_dev_priv *priv = netdev_priv(dev);
345 unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
346 struct sk_buff *skb, *newskb;
347 struct ipoib_cm_rx *p;
348 unsigned long flags;
349 u64 mapping[IPOIB_CM_RX_SG];
350 int frags;
351
352 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
353 wr_id, wc->status);
354
355 if (unlikely(wr_id >= ipoib_recvq_size)) {
356 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
357 wr_id, ipoib_recvq_size);
358 return;
359 }
360
361 skb = priv->cm.srq_ring[wr_id].skb;
362
363 if (unlikely(wc->status != IB_WC_SUCCESS)) {
364 ipoib_dbg(priv, "cm recv error "
365 "(status=%d, wrid=%d vend_err %x)\n",
366 wc->status, wr_id, wc->vendor_err);
367 ++priv->stats.rx_dropped;
368 goto repost;
369 }
370
371 if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
372 p = wc->qp->qp_context;
373 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
374 spin_lock_irqsave(&priv->lock, flags);
375 p->jiffies = jiffies;
376 /* Move this entry to list head, but do
377 * not re-add it if it has been removed. */
378 if (!list_empty(&p->list))
379 list_move(&p->list, &priv->cm.passive_ids);
380 spin_unlock_irqrestore(&priv->lock, flags);
381 queue_delayed_work(ipoib_workqueue,
382 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
383 }
384 }
385
386 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
387 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
388
389 newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
390 if (unlikely(!newskb)) {
391 /*
392 * If we can't allocate a new RX buffer, dump
393 * this packet and reuse the old buffer.
394 */
395 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
396 ++priv->stats.rx_dropped;
397 goto repost;
398 }
399
400 ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
401 memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
402
403 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
404 wc->byte_len, wc->slid);
405
406 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
407
408 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
409 skb_reset_mac_header(skb);
410 skb_pull(skb, IPOIB_ENCAP_LEN);
411
412 dev->last_rx = jiffies;
413 ++priv->stats.rx_packets;
414 priv->stats.rx_bytes += skb->len;
415
416 skb->dev = dev;
417 /* XXX get correct PACKET_ type here */
418 skb->pkt_type = PACKET_HOST;
419 netif_receive_skb(skb);
420
421 repost:
422 if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
423 ipoib_warn(priv, "ipoib_cm_post_receive failed "
424 "for buf %d\n", wr_id);
425 }
426
427 static inline int post_send(struct ipoib_dev_priv *priv,
428 struct ipoib_cm_tx *tx,
429 unsigned int wr_id,
430 u64 addr, int len)
431 {
432 struct ib_send_wr *bad_wr;
433
434 priv->tx_sge.addr = addr;
435 priv->tx_sge.length = len;
436
437 priv->tx_wr.wr_id = wr_id;
438
439 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
440 }
441
442 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
443 {
444 struct ipoib_dev_priv *priv = netdev_priv(dev);
445 struct ipoib_tx_buf *tx_req;
446 u64 addr;
447
448 if (unlikely(skb->len > tx->mtu)) {
449 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
450 skb->len, tx->mtu);
451 ++priv->stats.tx_dropped;
452 ++priv->stats.tx_errors;
453 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
454 return;
455 }
456
457 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
458 tx->tx_head, skb->len, tx->qp->qp_num);
459
460 /*
461 * We put the skb into the tx_ring _before_ we call post_send()
462 * because it's entirely possible that the completion handler will
463 * run before we execute anything after the post_send(). That
464 * means we have to make sure everything is properly recorded and
465 * our state is consistent before we call post_send().
466 */
467 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
468 tx_req->skb = skb;
469 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
470 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
471 ++priv->stats.tx_errors;
472 dev_kfree_skb_any(skb);
473 return;
474 }
475
476 tx_req->mapping = addr;
477
478 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
479 addr, skb->len))) {
480 ipoib_warn(priv, "post_send failed\n");
481 ++priv->stats.tx_errors;
482 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
483 dev_kfree_skb_any(skb);
484 } else {
485 dev->trans_start = jiffies;
486 ++tx->tx_head;
487
488 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
489 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
490 tx->qp->qp_num);
491 netif_stop_queue(dev);
492 set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
493 }
494 }
495 }
496
497 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
498 struct ib_wc *wc)
499 {
500 struct ipoib_dev_priv *priv = netdev_priv(dev);
501 unsigned int wr_id = wc->wr_id;
502 struct ipoib_tx_buf *tx_req;
503 unsigned long flags;
504
505 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
506 wr_id, wc->status);
507
508 if (unlikely(wr_id >= ipoib_sendq_size)) {
509 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
510 wr_id, ipoib_sendq_size);
511 return;
512 }
513
514 tx_req = &tx->tx_ring[wr_id];
515
516 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
517
518 /* FIXME: is this right? Shouldn't we only increment on success? */
519 ++priv->stats.tx_packets;
520 priv->stats.tx_bytes += tx_req->skb->len;
521
522 dev_kfree_skb_any(tx_req->skb);
523
524 spin_lock_irqsave(&priv->tx_lock, flags);
525 ++tx->tx_tail;
526 if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
527 tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
528 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
529 netif_wake_queue(dev);
530 }
531
532 if (wc->status != IB_WC_SUCCESS &&
533 wc->status != IB_WC_WR_FLUSH_ERR) {
534 struct ipoib_neigh *neigh;
535
536 ipoib_dbg(priv, "failed cm send event "
537 "(status=%d, wrid=%d vend_err %x)\n",
538 wc->status, wr_id, wc->vendor_err);
539
540 spin_lock(&priv->lock);
541 neigh = tx->neigh;
542
543 if (neigh) {
544 neigh->cm = NULL;
545 list_del(&neigh->list);
546 if (neigh->ah)
547 ipoib_put_ah(neigh->ah);
548 ipoib_neigh_free(dev, neigh);
549
550 tx->neigh = NULL;
551 }
552
553 /* queue would be re-started anyway when TX is destroyed,
554 * but it makes sense to do it ASAP here. */
555 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
556 netif_wake_queue(dev);
557
558 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
559 list_move(&tx->list, &priv->cm.reap_list);
560 queue_work(ipoib_workqueue, &priv->cm.reap_task);
561 }
562
563 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
564
565 spin_unlock(&priv->lock);
566 }
567
568 spin_unlock_irqrestore(&priv->tx_lock, flags);
569 }
570
571 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
572 {
573 struct ipoib_cm_tx *tx = tx_ptr;
574 int n, i;
575
576 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
577 do {
578 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
579 for (i = 0; i < n; ++i)
580 ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
581 } while (n == IPOIB_NUM_WC);
582 }
583
584 int ipoib_cm_dev_open(struct net_device *dev)
585 {
586 struct ipoib_dev_priv *priv = netdev_priv(dev);
587 int ret;
588
589 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
590 return 0;
591
592 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
593 if (IS_ERR(priv->cm.id)) {
594 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
595 ret = PTR_ERR(priv->cm.id);
596 priv->cm.id = NULL;
597 return ret;
598 }
599
600 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
601 0, NULL);
602 if (ret) {
603 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
604 IPOIB_CM_IETF_ID | priv->qp->qp_num);
605 ib_destroy_cm_id(priv->cm.id);
606 priv->cm.id = NULL;
607 return ret;
608 }
609 return 0;
610 }
611
612 void ipoib_cm_dev_stop(struct net_device *dev)
613 {
614 struct ipoib_dev_priv *priv = netdev_priv(dev);
615 struct ipoib_cm_rx *p;
616
617 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
618 return;
619
620 ib_destroy_cm_id(priv->cm.id);
621 priv->cm.id = NULL;
622 spin_lock_irq(&priv->lock);
623 while (!list_empty(&priv->cm.passive_ids)) {
624 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
625 list_del_init(&p->list);
626 spin_unlock_irq(&priv->lock);
627 ib_destroy_cm_id(p->id);
628 ib_destroy_qp(p->qp);
629 kfree(p);
630 spin_lock_irq(&priv->lock);
631 }
632 spin_unlock_irq(&priv->lock);
633
634 cancel_delayed_work(&priv->cm.stale_task);
635 }
636
637 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
638 {
639 struct ipoib_cm_tx *p = cm_id->context;
640 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
641 struct ipoib_cm_data *data = event->private_data;
642 struct sk_buff_head skqueue;
643 struct ib_qp_attr qp_attr;
644 int qp_attr_mask, ret;
645 struct sk_buff *skb;
646
647 p->mtu = be32_to_cpu(data->mtu);
648
649 if (p->mtu < priv->dev->mtu + IPOIB_ENCAP_LEN) {
650 ipoib_warn(priv, "Rejecting connection: mtu %d < device mtu %d + 4\n",
651 p->mtu, priv->dev->mtu);
652 return -EINVAL;
653 }
654
655 qp_attr.qp_state = IB_QPS_RTR;
656 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
657 if (ret) {
658 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
659 return ret;
660 }
661
662 qp_attr.rq_psn = 0 /* FIXME */;
663 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
664 if (ret) {
665 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
666 return ret;
667 }
668
669 qp_attr.qp_state = IB_QPS_RTS;
670 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
671 if (ret) {
672 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
673 return ret;
674 }
675 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
676 if (ret) {
677 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
678 return ret;
679 }
680
681 skb_queue_head_init(&skqueue);
682
683 spin_lock_irq(&priv->lock);
684 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
685 if (p->neigh)
686 while ((skb = __skb_dequeue(&p->neigh->queue)))
687 __skb_queue_tail(&skqueue, skb);
688 spin_unlock_irq(&priv->lock);
689
690 while ((skb = __skb_dequeue(&skqueue))) {
691 skb->dev = p->dev;
692 if (dev_queue_xmit(skb))
693 ipoib_warn(priv, "dev_queue_xmit failed "
694 "to requeue packet\n");
695 }
696
697 ret = ib_send_cm_rtu(cm_id, NULL, 0);
698 if (ret) {
699 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
700 return ret;
701 }
702 return 0;
703 }
704
705 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
706 {
707 struct ipoib_dev_priv *priv = netdev_priv(dev);
708 struct ib_qp_init_attr attr = {};
709 attr.recv_cq = priv->cq;
710 attr.srq = priv->cm.srq;
711 attr.cap.max_send_wr = ipoib_sendq_size;
712 attr.cap.max_send_sge = 1;
713 attr.sq_sig_type = IB_SIGNAL_ALL_WR;
714 attr.qp_type = IB_QPT_RC;
715 attr.send_cq = cq;
716 return ib_create_qp(priv->pd, &attr);
717 }
718
719 static int ipoib_cm_send_req(struct net_device *dev,
720 struct ib_cm_id *id, struct ib_qp *qp,
721 u32 qpn,
722 struct ib_sa_path_rec *pathrec)
723 {
724 struct ipoib_dev_priv *priv = netdev_priv(dev);
725 struct ipoib_cm_data data = {};
726 struct ib_cm_req_param req = {};
727
728 data.qpn = cpu_to_be32(priv->qp->qp_num);
729 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
730
731 req.primary_path = pathrec;
732 req.alternate_path = NULL;
733 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
734 req.qp_num = qp->qp_num;
735 req.qp_type = qp->qp_type;
736 req.private_data = &data;
737 req.private_data_len = sizeof data;
738 req.flow_control = 0;
739
740 req.starting_psn = 0; /* FIXME */
741
742 /*
743 * Pick some arbitrary defaults here; we could make these
744 * module parameters if anyone cared about setting them.
745 */
746 req.responder_resources = 4;
747 req.remote_cm_response_timeout = 20;
748 req.local_cm_response_timeout = 20;
749 req.retry_count = 0; /* RFC draft warns against retries */
750 req.rnr_retry_count = 0; /* RFC draft warns against retries */
751 req.max_cm_retries = 15;
752 req.srq = 1;
753 return ib_send_cm_req(id, &req);
754 }
755
756 static int ipoib_cm_modify_tx_init(struct net_device *dev,
757 struct ib_cm_id *cm_id, struct ib_qp *qp)
758 {
759 struct ipoib_dev_priv *priv = netdev_priv(dev);
760 struct ib_qp_attr qp_attr;
761 int qp_attr_mask, ret;
762 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
763 if (ret) {
764 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
765 return ret;
766 }
767
768 qp_attr.qp_state = IB_QPS_INIT;
769 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
770 qp_attr.port_num = priv->port;
771 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
772
773 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
774 if (ret) {
775 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
776 return ret;
777 }
778 return 0;
779 }
780
781 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
782 struct ib_sa_path_rec *pathrec)
783 {
784 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
785 int ret;
786
787 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
788 GFP_KERNEL);
789 if (!p->tx_ring) {
790 ipoib_warn(priv, "failed to allocate tx ring\n");
791 ret = -ENOMEM;
792 goto err_tx;
793 }
794
795 p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
796 ipoib_sendq_size + 1, 0);
797 if (IS_ERR(p->cq)) {
798 ret = PTR_ERR(p->cq);
799 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
800 goto err_cq;
801 }
802
803 ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
804 if (ret) {
805 ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
806 goto err_req_notify;
807 }
808
809 p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
810 if (IS_ERR(p->qp)) {
811 ret = PTR_ERR(p->qp);
812 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
813 goto err_qp;
814 }
815
816 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
817 if (IS_ERR(p->id)) {
818 ret = PTR_ERR(p->id);
819 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
820 goto err_id;
821 }
822
823 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
824 if (ret) {
825 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
826 goto err_modify;
827 }
828
829 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
830 if (ret) {
831 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
832 goto err_send_cm;
833 }
834
835 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
836 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
837
838 return 0;
839
840 err_send_cm:
841 err_modify:
842 ib_destroy_cm_id(p->id);
843 err_id:
844 p->id = NULL;
845 ib_destroy_qp(p->qp);
846 err_req_notify:
847 err_qp:
848 p->qp = NULL;
849 ib_destroy_cq(p->cq);
850 err_cq:
851 p->cq = NULL;
852 err_tx:
853 return ret;
854 }
855
856 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
857 {
858 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
859 struct ipoib_tx_buf *tx_req;
860
861 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
862 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
863
864 if (p->id)
865 ib_destroy_cm_id(p->id);
866
867 if (p->qp)
868 ib_destroy_qp(p->qp);
869
870 if (p->cq)
871 ib_destroy_cq(p->cq);
872
873 if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
874 netif_wake_queue(p->dev);
875
876 if (p->tx_ring) {
877 while ((int) p->tx_tail - (int) p->tx_head < 0) {
878 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
879 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
880 DMA_TO_DEVICE);
881 dev_kfree_skb_any(tx_req->skb);
882 ++p->tx_tail;
883 }
884
885 kfree(p->tx_ring);
886 }
887
888 kfree(p);
889 }
890
891 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
892 struct ib_cm_event *event)
893 {
894 struct ipoib_cm_tx *tx = cm_id->context;
895 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
896 struct net_device *dev = priv->dev;
897 struct ipoib_neigh *neigh;
898 int ret;
899
900 switch (event->event) {
901 case IB_CM_DREQ_RECEIVED:
902 ipoib_dbg(priv, "DREQ received.\n");
903 ib_send_cm_drep(cm_id, NULL, 0);
904 break;
905 case IB_CM_REP_RECEIVED:
906 ipoib_dbg(priv, "REP received.\n");
907 ret = ipoib_cm_rep_handler(cm_id, event);
908 if (ret)
909 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
910 NULL, 0, NULL, 0);
911 break;
912 case IB_CM_REQ_ERROR:
913 case IB_CM_REJ_RECEIVED:
914 case IB_CM_TIMEWAIT_EXIT:
915 ipoib_dbg(priv, "CM error %d.\n", event->event);
916 spin_lock_irq(&priv->tx_lock);
917 spin_lock(&priv->lock);
918 neigh = tx->neigh;
919
920 if (neigh) {
921 neigh->cm = NULL;
922 list_del(&neigh->list);
923 if (neigh->ah)
924 ipoib_put_ah(neigh->ah);
925 ipoib_neigh_free(dev, neigh);
926
927 tx->neigh = NULL;
928 }
929
930 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
931 list_move(&tx->list, &priv->cm.reap_list);
932 queue_work(ipoib_workqueue, &priv->cm.reap_task);
933 }
934
935 spin_unlock(&priv->lock);
936 spin_unlock_irq(&priv->tx_lock);
937 break;
938 default:
939 break;
940 }
941
942 return 0;
943 }
944
945 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
946 struct ipoib_neigh *neigh)
947 {
948 struct ipoib_dev_priv *priv = netdev_priv(dev);
949 struct ipoib_cm_tx *tx;
950
951 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
952 if (!tx)
953 return NULL;
954
955 neigh->cm = tx;
956 tx->neigh = neigh;
957 tx->path = path;
958 tx->dev = dev;
959 list_add(&tx->list, &priv->cm.start_list);
960 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
961 queue_work(ipoib_workqueue, &priv->cm.start_task);
962 return tx;
963 }
964
965 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
966 {
967 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
968 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
969 list_move(&tx->list, &priv->cm.reap_list);
970 queue_work(ipoib_workqueue, &priv->cm.reap_task);
971 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
972 IPOIB_GID_ARG(tx->neigh->dgid));
973 tx->neigh = NULL;
974 }
975 }
976
977 static void ipoib_cm_tx_start(struct work_struct *work)
978 {
979 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
980 cm.start_task);
981 struct net_device *dev = priv->dev;
982 struct ipoib_neigh *neigh;
983 struct ipoib_cm_tx *p;
984 unsigned long flags;
985 int ret;
986
987 struct ib_sa_path_rec pathrec;
988 u32 qpn;
989
990 spin_lock_irqsave(&priv->tx_lock, flags);
991 spin_lock(&priv->lock);
992 while (!list_empty(&priv->cm.start_list)) {
993 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
994 list_del_init(&p->list);
995 neigh = p->neigh;
996 qpn = IPOIB_QPN(neigh->neighbour->ha);
997 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
998 spin_unlock(&priv->lock);
999 spin_unlock_irqrestore(&priv->tx_lock, flags);
1000 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1001 spin_lock_irqsave(&priv->tx_lock, flags);
1002 spin_lock(&priv->lock);
1003 if (ret) {
1004 neigh = p->neigh;
1005 if (neigh) {
1006 neigh->cm = NULL;
1007 list_del(&neigh->list);
1008 if (neigh->ah)
1009 ipoib_put_ah(neigh->ah);
1010 ipoib_neigh_free(dev, neigh);
1011 }
1012 list_del(&p->list);
1013 kfree(p);
1014 }
1015 }
1016 spin_unlock(&priv->lock);
1017 spin_unlock_irqrestore(&priv->tx_lock, flags);
1018 }
1019
1020 static void ipoib_cm_tx_reap(struct work_struct *work)
1021 {
1022 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1023 cm.reap_task);
1024 struct ipoib_cm_tx *p;
1025
1026 spin_lock_irq(&priv->tx_lock);
1027 spin_lock(&priv->lock);
1028 while (!list_empty(&priv->cm.reap_list)) {
1029 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1030 list_del(&p->list);
1031 spin_unlock(&priv->lock);
1032 spin_unlock_irq(&priv->tx_lock);
1033 ipoib_cm_tx_destroy(p);
1034 spin_lock_irq(&priv->tx_lock);
1035 spin_lock(&priv->lock);
1036 }
1037 spin_unlock(&priv->lock);
1038 spin_unlock_irq(&priv->tx_lock);
1039 }
1040
1041 static void ipoib_cm_skb_reap(struct work_struct *work)
1042 {
1043 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1044 cm.skb_task);
1045 struct net_device *dev = priv->dev;
1046 struct sk_buff *skb;
1047
1048 unsigned mtu = priv->mcast_mtu;
1049
1050 spin_lock_irq(&priv->tx_lock);
1051 spin_lock(&priv->lock);
1052 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1053 spin_unlock(&priv->lock);
1054 spin_unlock_irq(&priv->tx_lock);
1055 if (skb->protocol == htons(ETH_P_IP))
1056 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1057 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1058 else if (skb->protocol == htons(ETH_P_IPV6))
1059 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1060 #endif
1061 dev_kfree_skb_any(skb);
1062 spin_lock_irq(&priv->tx_lock);
1063 spin_lock(&priv->lock);
1064 }
1065 spin_unlock(&priv->lock);
1066 spin_unlock_irq(&priv->tx_lock);
1067 }
1068
1069 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1070 unsigned int mtu)
1071 {
1072 struct ipoib_dev_priv *priv = netdev_priv(dev);
1073 int e = skb_queue_empty(&priv->cm.skb_queue);
1074
1075 if (skb->dst)
1076 skb->dst->ops->update_pmtu(skb->dst, mtu);
1077
1078 skb_queue_tail(&priv->cm.skb_queue, skb);
1079 if (e)
1080 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1081 }
1082
1083 static void ipoib_cm_stale_task(struct work_struct *work)
1084 {
1085 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1086 cm.stale_task.work);
1087 struct ipoib_cm_rx *p;
1088
1089 spin_lock_irq(&priv->lock);
1090 while (!list_empty(&priv->cm.passive_ids)) {
1091 /* List if sorted by LRU, start from tail,
1092 * stop when we see a recently used entry */
1093 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1094 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1095 break;
1096 list_del_init(&p->list);
1097 spin_unlock_irq(&priv->lock);
1098 ib_destroy_cm_id(p->id);
1099 ib_destroy_qp(p->qp);
1100 kfree(p);
1101 spin_lock_irq(&priv->lock);
1102 }
1103 spin_unlock_irq(&priv->lock);
1104 }
1105
1106
1107 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1108 char *buf)
1109 {
1110 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1111
1112 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1113 return sprintf(buf, "connected\n");
1114 else
1115 return sprintf(buf, "datagram\n");
1116 }
1117
1118 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1119 const char *buf, size_t count)
1120 {
1121 struct net_device *dev = to_net_dev(d);
1122 struct ipoib_dev_priv *priv = netdev_priv(dev);
1123
1124 /* flush paths if we switch modes so that connections are restarted */
1125 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1126 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1127 ipoib_warn(priv, "enabling connected mode "
1128 "will cause multicast packet drops\n");
1129 ipoib_flush_paths(dev);
1130 return count;
1131 }
1132
1133 if (!strcmp(buf, "datagram\n")) {
1134 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1135 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1136 ipoib_flush_paths(dev);
1137 return count;
1138 }
1139
1140 return -EINVAL;
1141 }
1142
1143 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1144
1145 int ipoib_cm_add_mode_attr(struct net_device *dev)
1146 {
1147 return device_create_file(&dev->dev, &dev_attr_mode);
1148 }
1149
1150 int ipoib_cm_dev_init(struct net_device *dev)
1151 {
1152 struct ipoib_dev_priv *priv = netdev_priv(dev);
1153 struct ib_srq_init_attr srq_init_attr = {
1154 .attr = {
1155 .max_wr = ipoib_recvq_size,
1156 .max_sge = IPOIB_CM_RX_SG
1157 }
1158 };
1159 int ret, i;
1160
1161 INIT_LIST_HEAD(&priv->cm.passive_ids);
1162 INIT_LIST_HEAD(&priv->cm.reap_list);
1163 INIT_LIST_HEAD(&priv->cm.start_list);
1164 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1165 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1166 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1167 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1168
1169 skb_queue_head_init(&priv->cm.skb_queue);
1170
1171 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1172 if (IS_ERR(priv->cm.srq)) {
1173 ret = PTR_ERR(priv->cm.srq);
1174 priv->cm.srq = NULL;
1175 return ret;
1176 }
1177
1178 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1179 GFP_KERNEL);
1180 if (!priv->cm.srq_ring) {
1181 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1182 priv->ca->name, ipoib_recvq_size);
1183 ipoib_cm_dev_cleanup(dev);
1184 return -ENOMEM;
1185 }
1186
1187 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1188 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1189
1190 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1191 for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1192 priv->cm.rx_sge[i].length = PAGE_SIZE;
1193 priv->cm.rx_wr.next = NULL;
1194 priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1195 priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1196
1197 for (i = 0; i < ipoib_recvq_size; ++i) {
1198 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1199 priv->cm.srq_ring[i].mapping)) {
1200 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1201 ipoib_cm_dev_cleanup(dev);
1202 return -ENOMEM;
1203 }
1204 if (ipoib_cm_post_receive(dev, i)) {
1205 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1206 ipoib_cm_dev_cleanup(dev);
1207 return -EIO;
1208 }
1209 }
1210
1211 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1212 return 0;
1213 }
1214
1215 void ipoib_cm_dev_cleanup(struct net_device *dev)
1216 {
1217 struct ipoib_dev_priv *priv = netdev_priv(dev);
1218 int i, ret;
1219
1220 if (!priv->cm.srq)
1221 return;
1222
1223 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1224
1225 ret = ib_destroy_srq(priv->cm.srq);
1226 if (ret)
1227 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1228
1229 priv->cm.srq = NULL;
1230 if (!priv->cm.srq_ring)
1231 return;
1232 for (i = 0; i < ipoib_recvq_size; ++i)
1233 if (priv->cm.srq_ring[i].skb) {
1234 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
1235 priv->cm.srq_ring[i].mapping);
1236 dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1237 priv->cm.srq_ring[i].skb = NULL;
1238 }
1239 kfree(priv->cm.srq_ring);
1240 priv->cm.srq_ring = NULL;
1241 }
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