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Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
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
33 #include <rdma/ib_cm.h>
34 #include <net/dst.h>
35 #include <net/icmp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
41
42 #include "ipoib.h"
43
44 int ipoib_max_conn_qp = 128;
45
46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
47 MODULE_PARM_DESC(max_nonsrq_conn_qp,
48 "Max number of connected-mode QPs per interface "
49 "(applied only if shared receive queue is not available)");
50
51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
52 static int data_debug_level;
53
54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
55 MODULE_PARM_DESC(cm_data_debug_level,
56 "Enable data path debug tracing for connected mode if > 0");
57 #endif
58
59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
60
61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
64 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
65
66 static struct ib_qp_attr ipoib_cm_err_attr = {
67 .qp_state = IB_QPS_ERR
68 };
69
70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
71
72 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
73 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
74 .opcode = IB_WR_SEND,
75 };
76
77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
78 struct ib_cm_event *event);
79
80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
81 u64 mapping[IPOIB_CM_RX_SG])
82 {
83 int i;
84
85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
86
87 for (i = 0; i < frags; ++i)
88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
89 }
90
91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
92 {
93 struct ipoib_dev_priv *priv = netdev_priv(dev);
94 struct ib_recv_wr *bad_wr;
95 int i, ret;
96
97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
98
99 for (i = 0; i < priv->cm.num_frags; ++i)
100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
101
102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
103 if (unlikely(ret)) {
104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
106 priv->cm.srq_ring[id].mapping);
107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
108 priv->cm.srq_ring[id].skb = NULL;
109 }
110
111 return ret;
112 }
113
114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
115 struct ipoib_cm_rx *rx,
116 struct ib_recv_wr *wr,
117 struct ib_sge *sge, int id)
118 {
119 struct ipoib_dev_priv *priv = netdev_priv(dev);
120 struct ib_recv_wr *bad_wr;
121 int i, ret;
122
123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
124
125 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
126 sge[i].addr = rx->rx_ring[id].mapping[i];
127
128 ret = ib_post_recv(rx->qp, wr, &bad_wr);
129 if (unlikely(ret)) {
130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
132 rx->rx_ring[id].mapping);
133 dev_kfree_skb_any(rx->rx_ring[id].skb);
134 rx->rx_ring[id].skb = NULL;
135 }
136
137 return ret;
138 }
139
140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
141 struct ipoib_cm_rx_buf *rx_ring,
142 int id, int frags,
143 u64 mapping[IPOIB_CM_RX_SG])
144 {
145 struct ipoib_dev_priv *priv = netdev_priv(dev);
146 struct sk_buff *skb;
147 int i;
148
149 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
150 if (unlikely(!skb))
151 return NULL;
152
153 /*
154 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
155 * IP header to a multiple of 16.
156 */
157 skb_reserve(skb, 12);
158
159 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
160 DMA_FROM_DEVICE);
161 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
162 dev_kfree_skb_any(skb);
163 return NULL;
164 }
165
166 for (i = 0; i < frags; i++) {
167 struct page *page = alloc_page(GFP_ATOMIC);
168
169 if (!page)
170 goto partial_error;
171 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
172
173 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
174 0, PAGE_SIZE, DMA_FROM_DEVICE);
175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
176 goto partial_error;
177 }
178
179 rx_ring[id].skb = skb;
180 return skb;
181
182 partial_error:
183
184 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
185
186 for (; i > 0; --i)
187 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
188
189 dev_kfree_skb_any(skb);
190 return NULL;
191 }
192
193 static void ipoib_cm_free_rx_ring(struct net_device *dev,
194 struct ipoib_cm_rx_buf *rx_ring)
195 {
196 struct ipoib_dev_priv *priv = netdev_priv(dev);
197 int i;
198
199 for (i = 0; i < ipoib_recvq_size; ++i)
200 if (rx_ring[i].skb) {
201 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
202 rx_ring[i].mapping);
203 dev_kfree_skb_any(rx_ring[i].skb);
204 }
205
206 vfree(rx_ring);
207 }
208
209 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
210 {
211 struct ib_send_wr *bad_wr;
212 struct ipoib_cm_rx *p;
213
214 /* We only reserved 1 extra slot in CQ for drain WRs, so
215 * make sure we have at most 1 outstanding WR. */
216 if (list_empty(&priv->cm.rx_flush_list) ||
217 !list_empty(&priv->cm.rx_drain_list))
218 return;
219
220 /*
221 * QPs on flush list are error state. This way, a "flush
222 * error" WC will be immediately generated for each WR we post.
223 */
224 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
225 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
226 ipoib_warn(priv, "failed to post drain wr\n");
227
228 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
229 }
230
231 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
232 {
233 struct ipoib_cm_rx *p = ctx;
234 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
235 unsigned long flags;
236
237 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
238 return;
239
240 spin_lock_irqsave(&priv->lock, flags);
241 list_move(&p->list, &priv->cm.rx_flush_list);
242 p->state = IPOIB_CM_RX_FLUSH;
243 ipoib_cm_start_rx_drain(priv);
244 spin_unlock_irqrestore(&priv->lock, flags);
245 }
246
247 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
248 struct ipoib_cm_rx *p)
249 {
250 struct ipoib_dev_priv *priv = netdev_priv(dev);
251 struct ib_qp_init_attr attr = {
252 .event_handler = ipoib_cm_rx_event_handler,
253 .send_cq = priv->recv_cq, /* For drain WR */
254 .recv_cq = priv->recv_cq,
255 .srq = priv->cm.srq,
256 .cap.max_send_wr = 1, /* For drain WR */
257 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
258 .sq_sig_type = IB_SIGNAL_ALL_WR,
259 .qp_type = IB_QPT_RC,
260 .qp_context = p,
261 };
262
263 if (!ipoib_cm_has_srq(dev)) {
264 attr.cap.max_recv_wr = ipoib_recvq_size;
265 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
266 }
267
268 return ib_create_qp(priv->pd, &attr);
269 }
270
271 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
272 struct ib_cm_id *cm_id, struct ib_qp *qp,
273 unsigned psn)
274 {
275 struct ipoib_dev_priv *priv = netdev_priv(dev);
276 struct ib_qp_attr qp_attr;
277 int qp_attr_mask, ret;
278
279 qp_attr.qp_state = IB_QPS_INIT;
280 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
281 if (ret) {
282 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
283 return ret;
284 }
285 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
286 if (ret) {
287 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
288 return ret;
289 }
290 qp_attr.qp_state = IB_QPS_RTR;
291 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
292 if (ret) {
293 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
294 return ret;
295 }
296 qp_attr.rq_psn = psn;
297 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
298 if (ret) {
299 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
300 return ret;
301 }
302
303 /*
304 * Current Mellanox HCA firmware won't generate completions
305 * with error for drain WRs unless the QP has been moved to
306 * RTS first. This work-around leaves a window where a QP has
307 * moved to error asynchronously, but this will eventually get
308 * fixed in firmware, so let's not error out if modify QP
309 * fails.
310 */
311 qp_attr.qp_state = IB_QPS_RTS;
312 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
313 if (ret) {
314 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
315 return 0;
316 }
317 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
318 if (ret) {
319 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
320 return 0;
321 }
322
323 return 0;
324 }
325
326 static void ipoib_cm_init_rx_wr(struct net_device *dev,
327 struct ib_recv_wr *wr,
328 struct ib_sge *sge)
329 {
330 struct ipoib_dev_priv *priv = netdev_priv(dev);
331 int i;
332
333 for (i = 0; i < priv->cm.num_frags; ++i)
334 sge[i].lkey = priv->mr->lkey;
335
336 sge[0].length = IPOIB_CM_HEAD_SIZE;
337 for (i = 1; i < priv->cm.num_frags; ++i)
338 sge[i].length = PAGE_SIZE;
339
340 wr->next = NULL;
341 wr->sg_list = sge;
342 wr->num_sge = priv->cm.num_frags;
343 }
344
345 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
346 struct ipoib_cm_rx *rx)
347 {
348 struct ipoib_dev_priv *priv = netdev_priv(dev);
349 struct {
350 struct ib_recv_wr wr;
351 struct ib_sge sge[IPOIB_CM_RX_SG];
352 } *t;
353 int ret;
354 int i;
355
356 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
357 if (!rx->rx_ring) {
358 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
359 priv->ca->name, ipoib_recvq_size);
360 return -ENOMEM;
361 }
362
363 t = kmalloc(sizeof *t, GFP_KERNEL);
364 if (!t) {
365 ret = -ENOMEM;
366 goto err_free;
367 }
368
369 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
370
371 spin_lock_irq(&priv->lock);
372
373 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
374 spin_unlock_irq(&priv->lock);
375 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
376 ret = -EINVAL;
377 goto err_free;
378 } else
379 ++priv->cm.nonsrq_conn_qp;
380
381 spin_unlock_irq(&priv->lock);
382
383 for (i = 0; i < ipoib_recvq_size; ++i) {
384 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
385 rx->rx_ring[i].mapping)) {
386 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
387 ret = -ENOMEM;
388 goto err_count;
389 }
390 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
391 if (ret) {
392 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
393 "failed for buf %d\n", i);
394 ret = -EIO;
395 goto err_count;
396 }
397 }
398
399 rx->recv_count = ipoib_recvq_size;
400
401 kfree(t);
402
403 return 0;
404
405 err_count:
406 spin_lock_irq(&priv->lock);
407 --priv->cm.nonsrq_conn_qp;
408 spin_unlock_irq(&priv->lock);
409
410 err_free:
411 kfree(t);
412 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
413
414 return ret;
415 }
416
417 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
418 struct ib_qp *qp, struct ib_cm_req_event_param *req,
419 unsigned psn)
420 {
421 struct ipoib_dev_priv *priv = netdev_priv(dev);
422 struct ipoib_cm_data data = {};
423 struct ib_cm_rep_param rep = {};
424
425 data.qpn = cpu_to_be32(priv->qp->qp_num);
426 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
427
428 rep.private_data = &data;
429 rep.private_data_len = sizeof data;
430 rep.flow_control = 0;
431 rep.rnr_retry_count = req->rnr_retry_count;
432 rep.srq = ipoib_cm_has_srq(dev);
433 rep.qp_num = qp->qp_num;
434 rep.starting_psn = psn;
435 return ib_send_cm_rep(cm_id, &rep);
436 }
437
438 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
439 {
440 struct net_device *dev = cm_id->context;
441 struct ipoib_dev_priv *priv = netdev_priv(dev);
442 struct ipoib_cm_rx *p;
443 unsigned psn;
444 int ret;
445
446 ipoib_dbg(priv, "REQ arrived\n");
447 p = kzalloc(sizeof *p, GFP_KERNEL);
448 if (!p)
449 return -ENOMEM;
450 p->dev = dev;
451 p->id = cm_id;
452 cm_id->context = p;
453 p->state = IPOIB_CM_RX_LIVE;
454 p->jiffies = jiffies;
455 INIT_LIST_HEAD(&p->list);
456
457 p->qp = ipoib_cm_create_rx_qp(dev, p);
458 if (IS_ERR(p->qp)) {
459 ret = PTR_ERR(p->qp);
460 goto err_qp;
461 }
462
463 psn = random32() & 0xffffff;
464 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
465 if (ret)
466 goto err_modify;
467
468 if (!ipoib_cm_has_srq(dev)) {
469 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
470 if (ret)
471 goto err_modify;
472 }
473
474 spin_lock_irq(&priv->lock);
475 queue_delayed_work(ipoib_workqueue,
476 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
477 /* Add this entry to passive ids list head, but do not re-add it
478 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
479 p->jiffies = jiffies;
480 if (p->state == IPOIB_CM_RX_LIVE)
481 list_move(&p->list, &priv->cm.passive_ids);
482 spin_unlock_irq(&priv->lock);
483
484 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
485 if (ret) {
486 ipoib_warn(priv, "failed to send REP: %d\n", ret);
487 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
488 ipoib_warn(priv, "unable to move qp to error state\n");
489 }
490 return 0;
491
492 err_modify:
493 ib_destroy_qp(p->qp);
494 err_qp:
495 kfree(p);
496 return ret;
497 }
498
499 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
500 struct ib_cm_event *event)
501 {
502 struct ipoib_cm_rx *p;
503 struct ipoib_dev_priv *priv;
504
505 switch (event->event) {
506 case IB_CM_REQ_RECEIVED:
507 return ipoib_cm_req_handler(cm_id, event);
508 case IB_CM_DREQ_RECEIVED:
509 p = cm_id->context;
510 ib_send_cm_drep(cm_id, NULL, 0);
511 /* Fall through */
512 case IB_CM_REJ_RECEIVED:
513 p = cm_id->context;
514 priv = netdev_priv(p->dev);
515 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
516 ipoib_warn(priv, "unable to move qp to error state\n");
517 /* Fall through */
518 default:
519 return 0;
520 }
521 }
522 /* Adjust length of skb with fragments to match received data */
523 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
524 unsigned int length, struct sk_buff *toskb)
525 {
526 int i, num_frags;
527 unsigned int size;
528
529 /* put header into skb */
530 size = min(length, hdr_space);
531 skb->tail += size;
532 skb->len += size;
533 length -= size;
534
535 num_frags = skb_shinfo(skb)->nr_frags;
536 for (i = 0; i < num_frags; i++) {
537 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
538
539 if (length == 0) {
540 /* don't need this page */
541 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
542 0, PAGE_SIZE);
543 --skb_shinfo(skb)->nr_frags;
544 } else {
545 size = min(length, (unsigned) PAGE_SIZE);
546
547 skb_frag_size_set(frag, size);
548 skb->data_len += size;
549 skb->truesize += size;
550 skb->len += size;
551 length -= size;
552 }
553 }
554 }
555
556 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
557 {
558 struct ipoib_dev_priv *priv = netdev_priv(dev);
559 struct ipoib_cm_rx_buf *rx_ring;
560 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
561 struct sk_buff *skb, *newskb;
562 struct ipoib_cm_rx *p;
563 unsigned long flags;
564 u64 mapping[IPOIB_CM_RX_SG];
565 int frags;
566 int has_srq;
567 struct sk_buff *small_skb;
568
569 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
570 wr_id, wc->status);
571
572 if (unlikely(wr_id >= ipoib_recvq_size)) {
573 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
574 spin_lock_irqsave(&priv->lock, flags);
575 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
576 ipoib_cm_start_rx_drain(priv);
577 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
578 spin_unlock_irqrestore(&priv->lock, flags);
579 } else
580 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
581 wr_id, ipoib_recvq_size);
582 return;
583 }
584
585 p = wc->qp->qp_context;
586
587 has_srq = ipoib_cm_has_srq(dev);
588 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
589
590 skb = rx_ring[wr_id].skb;
591
592 if (unlikely(wc->status != IB_WC_SUCCESS)) {
593 ipoib_dbg(priv, "cm recv error "
594 "(status=%d, wrid=%d vend_err %x)\n",
595 wc->status, wr_id, wc->vendor_err);
596 ++dev->stats.rx_dropped;
597 if (has_srq)
598 goto repost;
599 else {
600 if (!--p->recv_count) {
601 spin_lock_irqsave(&priv->lock, flags);
602 list_move(&p->list, &priv->cm.rx_reap_list);
603 spin_unlock_irqrestore(&priv->lock, flags);
604 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
605 }
606 return;
607 }
608 }
609
610 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
611 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
612 spin_lock_irqsave(&priv->lock, flags);
613 p->jiffies = jiffies;
614 /* Move this entry to list head, but do not re-add it
615 * if it has been moved out of list. */
616 if (p->state == IPOIB_CM_RX_LIVE)
617 list_move(&p->list, &priv->cm.passive_ids);
618 spin_unlock_irqrestore(&priv->lock, flags);
619 }
620 }
621
622 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
623 int dlen = wc->byte_len;
624
625 small_skb = dev_alloc_skb(dlen + 12);
626 if (small_skb) {
627 skb_reserve(small_skb, 12);
628 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
629 dlen, DMA_FROM_DEVICE);
630 skb_copy_from_linear_data(skb, small_skb->data, dlen);
631 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
632 dlen, DMA_FROM_DEVICE);
633 skb_put(small_skb, dlen);
634 skb = small_skb;
635 goto copied;
636 }
637 }
638
639 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
640 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
641
642 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
643 if (unlikely(!newskb)) {
644 /*
645 * If we can't allocate a new RX buffer, dump
646 * this packet and reuse the old buffer.
647 */
648 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
649 ++dev->stats.rx_dropped;
650 goto repost;
651 }
652
653 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
654 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
655
656 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
657 wc->byte_len, wc->slid);
658
659 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
660
661 copied:
662 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
663 skb_reset_mac_header(skb);
664 skb_pull(skb, IPOIB_ENCAP_LEN);
665
666 ++dev->stats.rx_packets;
667 dev->stats.rx_bytes += skb->len;
668
669 skb->dev = dev;
670 /* XXX get correct PACKET_ type here */
671 skb->pkt_type = PACKET_HOST;
672 netif_receive_skb(skb);
673
674 repost:
675 if (has_srq) {
676 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
677 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
678 "for buf %d\n", wr_id);
679 } else {
680 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
681 &priv->cm.rx_wr,
682 priv->cm.rx_sge,
683 wr_id))) {
684 --p->recv_count;
685 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
686 "for buf %d\n", wr_id);
687 }
688 }
689 }
690
691 static inline int post_send(struct ipoib_dev_priv *priv,
692 struct ipoib_cm_tx *tx,
693 unsigned int wr_id,
694 u64 addr, int len)
695 {
696 struct ib_send_wr *bad_wr;
697
698 priv->tx_sge[0].addr = addr;
699 priv->tx_sge[0].length = len;
700
701 priv->tx_wr.num_sge = 1;
702 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
703
704 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
705 }
706
707 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
708 {
709 struct ipoib_dev_priv *priv = netdev_priv(dev);
710 struct ipoib_cm_tx_buf *tx_req;
711 u64 addr;
712 int rc;
713
714 if (unlikely(skb->len > tx->mtu)) {
715 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
716 skb->len, tx->mtu);
717 ++dev->stats.tx_dropped;
718 ++dev->stats.tx_errors;
719 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
720 return;
721 }
722
723 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
724 tx->tx_head, skb->len, tx->qp->qp_num);
725
726 /*
727 * We put the skb into the tx_ring _before_ we call post_send()
728 * because it's entirely possible that the completion handler will
729 * run before we execute anything after the post_send(). That
730 * means we have to make sure everything is properly recorded and
731 * our state is consistent before we call post_send().
732 */
733 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
734 tx_req->skb = skb;
735 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
736 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
737 ++dev->stats.tx_errors;
738 dev_kfree_skb_any(skb);
739 return;
740 }
741
742 tx_req->mapping = addr;
743
744 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
745 addr, skb->len);
746 if (unlikely(rc)) {
747 ipoib_warn(priv, "post_send failed, error %d\n", rc);
748 ++dev->stats.tx_errors;
749 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
750 dev_kfree_skb_any(skb);
751 } else {
752 dev->trans_start = jiffies;
753 ++tx->tx_head;
754
755 if (++priv->tx_outstanding == ipoib_sendq_size) {
756 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
757 tx->qp->qp_num);
758 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
759 ipoib_warn(priv, "request notify on send CQ failed\n");
760 netif_stop_queue(dev);
761 }
762 }
763 }
764
765 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
766 {
767 struct ipoib_dev_priv *priv = netdev_priv(dev);
768 struct ipoib_cm_tx *tx = wc->qp->qp_context;
769 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
770 struct ipoib_cm_tx_buf *tx_req;
771 unsigned long flags;
772
773 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
774 wr_id, wc->status);
775
776 if (unlikely(wr_id >= ipoib_sendq_size)) {
777 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
778 wr_id, ipoib_sendq_size);
779 return;
780 }
781
782 tx_req = &tx->tx_ring[wr_id];
783
784 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
785
786 /* FIXME: is this right? Shouldn't we only increment on success? */
787 ++dev->stats.tx_packets;
788 dev->stats.tx_bytes += tx_req->skb->len;
789
790 dev_kfree_skb_any(tx_req->skb);
791
792 netif_tx_lock(dev);
793
794 ++tx->tx_tail;
795 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
796 netif_queue_stopped(dev) &&
797 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
798 netif_wake_queue(dev);
799
800 if (wc->status != IB_WC_SUCCESS &&
801 wc->status != IB_WC_WR_FLUSH_ERR) {
802 struct ipoib_neigh *neigh;
803
804 ipoib_dbg(priv, "failed cm send event "
805 "(status=%d, wrid=%d vend_err %x)\n",
806 wc->status, wr_id, wc->vendor_err);
807
808 spin_lock_irqsave(&priv->lock, flags);
809 neigh = tx->neigh;
810
811 if (neigh) {
812 neigh->cm = NULL;
813 list_del(&neigh->list);
814 if (neigh->ah)
815 ipoib_put_ah(neigh->ah);
816 ipoib_neigh_free(dev, neigh);
817
818 tx->neigh = NULL;
819 }
820
821 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
822 list_move(&tx->list, &priv->cm.reap_list);
823 queue_work(ipoib_workqueue, &priv->cm.reap_task);
824 }
825
826 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
827
828 spin_unlock_irqrestore(&priv->lock, flags);
829 }
830
831 netif_tx_unlock(dev);
832 }
833
834 int ipoib_cm_dev_open(struct net_device *dev)
835 {
836 struct ipoib_dev_priv *priv = netdev_priv(dev);
837 int ret;
838
839 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
840 return 0;
841
842 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
843 if (IS_ERR(priv->cm.id)) {
844 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
845 ret = PTR_ERR(priv->cm.id);
846 goto err_cm;
847 }
848
849 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
850 0, NULL);
851 if (ret) {
852 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
853 IPOIB_CM_IETF_ID | priv->qp->qp_num);
854 goto err_listen;
855 }
856
857 return 0;
858
859 err_listen:
860 ib_destroy_cm_id(priv->cm.id);
861 err_cm:
862 priv->cm.id = NULL;
863 return ret;
864 }
865
866 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
867 {
868 struct ipoib_dev_priv *priv = netdev_priv(dev);
869 struct ipoib_cm_rx *rx, *n;
870 LIST_HEAD(list);
871
872 spin_lock_irq(&priv->lock);
873 list_splice_init(&priv->cm.rx_reap_list, &list);
874 spin_unlock_irq(&priv->lock);
875
876 list_for_each_entry_safe(rx, n, &list, list) {
877 ib_destroy_cm_id(rx->id);
878 ib_destroy_qp(rx->qp);
879 if (!ipoib_cm_has_srq(dev)) {
880 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
881 spin_lock_irq(&priv->lock);
882 --priv->cm.nonsrq_conn_qp;
883 spin_unlock_irq(&priv->lock);
884 }
885 kfree(rx);
886 }
887 }
888
889 void ipoib_cm_dev_stop(struct net_device *dev)
890 {
891 struct ipoib_dev_priv *priv = netdev_priv(dev);
892 struct ipoib_cm_rx *p;
893 unsigned long begin;
894 int ret;
895
896 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
897 return;
898
899 ib_destroy_cm_id(priv->cm.id);
900 priv->cm.id = NULL;
901
902 spin_lock_irq(&priv->lock);
903 while (!list_empty(&priv->cm.passive_ids)) {
904 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
905 list_move(&p->list, &priv->cm.rx_error_list);
906 p->state = IPOIB_CM_RX_ERROR;
907 spin_unlock_irq(&priv->lock);
908 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
909 if (ret)
910 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
911 spin_lock_irq(&priv->lock);
912 }
913
914 /* Wait for all RX to be drained */
915 begin = jiffies;
916
917 while (!list_empty(&priv->cm.rx_error_list) ||
918 !list_empty(&priv->cm.rx_flush_list) ||
919 !list_empty(&priv->cm.rx_drain_list)) {
920 if (time_after(jiffies, begin + 5 * HZ)) {
921 ipoib_warn(priv, "RX drain timing out\n");
922
923 /*
924 * assume the HW is wedged and just free up everything.
925 */
926 list_splice_init(&priv->cm.rx_flush_list,
927 &priv->cm.rx_reap_list);
928 list_splice_init(&priv->cm.rx_error_list,
929 &priv->cm.rx_reap_list);
930 list_splice_init(&priv->cm.rx_drain_list,
931 &priv->cm.rx_reap_list);
932 break;
933 }
934 spin_unlock_irq(&priv->lock);
935 msleep(1);
936 ipoib_drain_cq(dev);
937 spin_lock_irq(&priv->lock);
938 }
939
940 spin_unlock_irq(&priv->lock);
941
942 ipoib_cm_free_rx_reap_list(dev);
943
944 cancel_delayed_work(&priv->cm.stale_task);
945 }
946
947 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
948 {
949 struct ipoib_cm_tx *p = cm_id->context;
950 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
951 struct ipoib_cm_data *data = event->private_data;
952 struct sk_buff_head skqueue;
953 struct ib_qp_attr qp_attr;
954 int qp_attr_mask, ret;
955 struct sk_buff *skb;
956
957 p->mtu = be32_to_cpu(data->mtu);
958
959 if (p->mtu <= IPOIB_ENCAP_LEN) {
960 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
961 p->mtu, IPOIB_ENCAP_LEN);
962 return -EINVAL;
963 }
964
965 qp_attr.qp_state = IB_QPS_RTR;
966 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
967 if (ret) {
968 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
969 return ret;
970 }
971
972 qp_attr.rq_psn = 0 /* FIXME */;
973 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
974 if (ret) {
975 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
976 return ret;
977 }
978
979 qp_attr.qp_state = IB_QPS_RTS;
980 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
981 if (ret) {
982 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
983 return ret;
984 }
985 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
986 if (ret) {
987 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
988 return ret;
989 }
990
991 skb_queue_head_init(&skqueue);
992
993 spin_lock_irq(&priv->lock);
994 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
995 if (p->neigh)
996 while ((skb = __skb_dequeue(&p->neigh->queue)))
997 __skb_queue_tail(&skqueue, skb);
998 spin_unlock_irq(&priv->lock);
999
1000 while ((skb = __skb_dequeue(&skqueue))) {
1001 skb->dev = p->dev;
1002 if (dev_queue_xmit(skb))
1003 ipoib_warn(priv, "dev_queue_xmit failed "
1004 "to requeue packet\n");
1005 }
1006
1007 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1008 if (ret) {
1009 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1010 return ret;
1011 }
1012 return 0;
1013 }
1014
1015 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1016 {
1017 struct ipoib_dev_priv *priv = netdev_priv(dev);
1018 struct ib_qp_init_attr attr = {
1019 .send_cq = priv->recv_cq,
1020 .recv_cq = priv->recv_cq,
1021 .srq = priv->cm.srq,
1022 .cap.max_send_wr = ipoib_sendq_size,
1023 .cap.max_send_sge = 1,
1024 .sq_sig_type = IB_SIGNAL_ALL_WR,
1025 .qp_type = IB_QPT_RC,
1026 .qp_context = tx
1027 };
1028
1029 return ib_create_qp(priv->pd, &attr);
1030 }
1031
1032 static int ipoib_cm_send_req(struct net_device *dev,
1033 struct ib_cm_id *id, struct ib_qp *qp,
1034 u32 qpn,
1035 struct ib_sa_path_rec *pathrec)
1036 {
1037 struct ipoib_dev_priv *priv = netdev_priv(dev);
1038 struct ipoib_cm_data data = {};
1039 struct ib_cm_req_param req = {};
1040
1041 data.qpn = cpu_to_be32(priv->qp->qp_num);
1042 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1043
1044 req.primary_path = pathrec;
1045 req.alternate_path = NULL;
1046 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1047 req.qp_num = qp->qp_num;
1048 req.qp_type = qp->qp_type;
1049 req.private_data = &data;
1050 req.private_data_len = sizeof data;
1051 req.flow_control = 0;
1052
1053 req.starting_psn = 0; /* FIXME */
1054
1055 /*
1056 * Pick some arbitrary defaults here; we could make these
1057 * module parameters if anyone cared about setting them.
1058 */
1059 req.responder_resources = 4;
1060 req.remote_cm_response_timeout = 20;
1061 req.local_cm_response_timeout = 20;
1062 req.retry_count = 0; /* RFC draft warns against retries */
1063 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1064 req.max_cm_retries = 15;
1065 req.srq = ipoib_cm_has_srq(dev);
1066 return ib_send_cm_req(id, &req);
1067 }
1068
1069 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1070 struct ib_cm_id *cm_id, struct ib_qp *qp)
1071 {
1072 struct ipoib_dev_priv *priv = netdev_priv(dev);
1073 struct ib_qp_attr qp_attr;
1074 int qp_attr_mask, ret;
1075 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1076 if (ret) {
1077 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1078 return ret;
1079 }
1080
1081 qp_attr.qp_state = IB_QPS_INIT;
1082 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1083 qp_attr.port_num = priv->port;
1084 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1085
1086 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1087 if (ret) {
1088 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1089 return ret;
1090 }
1091 return 0;
1092 }
1093
1094 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1095 struct ib_sa_path_rec *pathrec)
1096 {
1097 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1098 int ret;
1099
1100 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1101 if (!p->tx_ring) {
1102 ipoib_warn(priv, "failed to allocate tx ring\n");
1103 ret = -ENOMEM;
1104 goto err_tx;
1105 }
1106
1107 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1108 if (IS_ERR(p->qp)) {
1109 ret = PTR_ERR(p->qp);
1110 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1111 goto err_qp;
1112 }
1113
1114 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1115 if (IS_ERR(p->id)) {
1116 ret = PTR_ERR(p->id);
1117 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1118 goto err_id;
1119 }
1120
1121 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1122 if (ret) {
1123 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1124 goto err_modify;
1125 }
1126
1127 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1128 if (ret) {
1129 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1130 goto err_send_cm;
1131 }
1132
1133 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1134 p->qp->qp_num, pathrec->dgid.raw, qpn);
1135
1136 return 0;
1137
1138 err_send_cm:
1139 err_modify:
1140 ib_destroy_cm_id(p->id);
1141 err_id:
1142 p->id = NULL;
1143 ib_destroy_qp(p->qp);
1144 err_qp:
1145 p->qp = NULL;
1146 vfree(p->tx_ring);
1147 err_tx:
1148 return ret;
1149 }
1150
1151 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1152 {
1153 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1154 struct ipoib_cm_tx_buf *tx_req;
1155 unsigned long begin;
1156
1157 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1158 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1159
1160 if (p->id)
1161 ib_destroy_cm_id(p->id);
1162
1163 if (p->tx_ring) {
1164 /* Wait for all sends to complete */
1165 begin = jiffies;
1166 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1167 if (time_after(jiffies, begin + 5 * HZ)) {
1168 ipoib_warn(priv, "timing out; %d sends not completed\n",
1169 p->tx_head - p->tx_tail);
1170 goto timeout;
1171 }
1172
1173 msleep(1);
1174 }
1175 }
1176
1177 timeout:
1178
1179 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1180 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1181 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1182 DMA_TO_DEVICE);
1183 dev_kfree_skb_any(tx_req->skb);
1184 ++p->tx_tail;
1185 netif_tx_lock_bh(p->dev);
1186 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1187 netif_queue_stopped(p->dev) &&
1188 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1189 netif_wake_queue(p->dev);
1190 netif_tx_unlock_bh(p->dev);
1191 }
1192
1193 if (p->qp)
1194 ib_destroy_qp(p->qp);
1195
1196 vfree(p->tx_ring);
1197 kfree(p);
1198 }
1199
1200 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1201 struct ib_cm_event *event)
1202 {
1203 struct ipoib_cm_tx *tx = cm_id->context;
1204 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1205 struct net_device *dev = priv->dev;
1206 struct ipoib_neigh *neigh;
1207 unsigned long flags;
1208 int ret;
1209
1210 switch (event->event) {
1211 case IB_CM_DREQ_RECEIVED:
1212 ipoib_dbg(priv, "DREQ received.\n");
1213 ib_send_cm_drep(cm_id, NULL, 0);
1214 break;
1215 case IB_CM_REP_RECEIVED:
1216 ipoib_dbg(priv, "REP received.\n");
1217 ret = ipoib_cm_rep_handler(cm_id, event);
1218 if (ret)
1219 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1220 NULL, 0, NULL, 0);
1221 break;
1222 case IB_CM_REQ_ERROR:
1223 case IB_CM_REJ_RECEIVED:
1224 case IB_CM_TIMEWAIT_EXIT:
1225 ipoib_dbg(priv, "CM error %d.\n", event->event);
1226 netif_tx_lock_bh(dev);
1227 spin_lock_irqsave(&priv->lock, flags);
1228 neigh = tx->neigh;
1229
1230 if (neigh) {
1231 neigh->cm = NULL;
1232 list_del(&neigh->list);
1233 if (neigh->ah)
1234 ipoib_put_ah(neigh->ah);
1235 ipoib_neigh_free(dev, neigh);
1236
1237 tx->neigh = NULL;
1238 }
1239
1240 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1241 list_move(&tx->list, &priv->cm.reap_list);
1242 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1243 }
1244
1245 spin_unlock_irqrestore(&priv->lock, flags);
1246 netif_tx_unlock_bh(dev);
1247 break;
1248 default:
1249 break;
1250 }
1251
1252 return 0;
1253 }
1254
1255 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1256 struct ipoib_neigh *neigh)
1257 {
1258 struct ipoib_dev_priv *priv = netdev_priv(dev);
1259 struct ipoib_cm_tx *tx;
1260
1261 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1262 if (!tx)
1263 return NULL;
1264
1265 neigh->cm = tx;
1266 tx->neigh = neigh;
1267 tx->path = path;
1268 tx->dev = dev;
1269 list_add(&tx->list, &priv->cm.start_list);
1270 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1271 queue_work(ipoib_workqueue, &priv->cm.start_task);
1272 return tx;
1273 }
1274
1275 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1276 {
1277 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1278 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1279 list_move(&tx->list, &priv->cm.reap_list);
1280 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1281 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1282 tx->neigh->dgid.raw);
1283 tx->neigh = NULL;
1284 }
1285 }
1286
1287 static void ipoib_cm_tx_start(struct work_struct *work)
1288 {
1289 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1290 cm.start_task);
1291 struct net_device *dev = priv->dev;
1292 struct ipoib_neigh *neigh;
1293 struct ipoib_cm_tx *p;
1294 unsigned long flags;
1295 int ret;
1296
1297 struct ib_sa_path_rec pathrec;
1298 u32 qpn;
1299
1300 netif_tx_lock_bh(dev);
1301 spin_lock_irqsave(&priv->lock, flags);
1302
1303 while (!list_empty(&priv->cm.start_list)) {
1304 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1305 list_del_init(&p->list);
1306 neigh = p->neigh;
1307 qpn = IPOIB_QPN(neigh->neighbour->ha);
1308 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1309
1310 spin_unlock_irqrestore(&priv->lock, flags);
1311 netif_tx_unlock_bh(dev);
1312
1313 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1314
1315 netif_tx_lock_bh(dev);
1316 spin_lock_irqsave(&priv->lock, flags);
1317
1318 if (ret) {
1319 neigh = p->neigh;
1320 if (neigh) {
1321 neigh->cm = NULL;
1322 list_del(&neigh->list);
1323 if (neigh->ah)
1324 ipoib_put_ah(neigh->ah);
1325 ipoib_neigh_free(dev, neigh);
1326 }
1327 list_del(&p->list);
1328 kfree(p);
1329 }
1330 }
1331
1332 spin_unlock_irqrestore(&priv->lock, flags);
1333 netif_tx_unlock_bh(dev);
1334 }
1335
1336 static void ipoib_cm_tx_reap(struct work_struct *work)
1337 {
1338 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1339 cm.reap_task);
1340 struct net_device *dev = priv->dev;
1341 struct ipoib_cm_tx *p;
1342 unsigned long flags;
1343
1344 netif_tx_lock_bh(dev);
1345 spin_lock_irqsave(&priv->lock, flags);
1346
1347 while (!list_empty(&priv->cm.reap_list)) {
1348 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1349 list_del(&p->list);
1350 spin_unlock_irqrestore(&priv->lock, flags);
1351 netif_tx_unlock_bh(dev);
1352 ipoib_cm_tx_destroy(p);
1353 netif_tx_lock_bh(dev);
1354 spin_lock_irqsave(&priv->lock, flags);
1355 }
1356
1357 spin_unlock_irqrestore(&priv->lock, flags);
1358 netif_tx_unlock_bh(dev);
1359 }
1360
1361 static void ipoib_cm_skb_reap(struct work_struct *work)
1362 {
1363 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1364 cm.skb_task);
1365 struct net_device *dev = priv->dev;
1366 struct sk_buff *skb;
1367 unsigned long flags;
1368 unsigned mtu = priv->mcast_mtu;
1369
1370 netif_tx_lock_bh(dev);
1371 spin_lock_irqsave(&priv->lock, flags);
1372
1373 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1374 spin_unlock_irqrestore(&priv->lock, flags);
1375 netif_tx_unlock_bh(dev);
1376
1377 if (skb->protocol == htons(ETH_P_IP))
1378 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1379 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1380 else if (skb->protocol == htons(ETH_P_IPV6))
1381 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1382 #endif
1383 dev_kfree_skb_any(skb);
1384
1385 netif_tx_lock_bh(dev);
1386 spin_lock_irqsave(&priv->lock, flags);
1387 }
1388
1389 spin_unlock_irqrestore(&priv->lock, flags);
1390 netif_tx_unlock_bh(dev);
1391 }
1392
1393 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1394 unsigned int mtu)
1395 {
1396 struct ipoib_dev_priv *priv = netdev_priv(dev);
1397 int e = skb_queue_empty(&priv->cm.skb_queue);
1398
1399 if (skb_dst(skb))
1400 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
1401
1402 skb_queue_tail(&priv->cm.skb_queue, skb);
1403 if (e)
1404 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1405 }
1406
1407 static void ipoib_cm_rx_reap(struct work_struct *work)
1408 {
1409 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1410 cm.rx_reap_task)->dev);
1411 }
1412
1413 static void ipoib_cm_stale_task(struct work_struct *work)
1414 {
1415 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1416 cm.stale_task.work);
1417 struct ipoib_cm_rx *p;
1418 int ret;
1419
1420 spin_lock_irq(&priv->lock);
1421 while (!list_empty(&priv->cm.passive_ids)) {
1422 /* List is sorted by LRU, start from tail,
1423 * stop when we see a recently used entry */
1424 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1425 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1426 break;
1427 list_move(&p->list, &priv->cm.rx_error_list);
1428 p->state = IPOIB_CM_RX_ERROR;
1429 spin_unlock_irq(&priv->lock);
1430 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1431 if (ret)
1432 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1433 spin_lock_irq(&priv->lock);
1434 }
1435
1436 if (!list_empty(&priv->cm.passive_ids))
1437 queue_delayed_work(ipoib_workqueue,
1438 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1439 spin_unlock_irq(&priv->lock);
1440 }
1441
1442
1443 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1444 char *buf)
1445 {
1446 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1447
1448 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1449 return sprintf(buf, "connected\n");
1450 else
1451 return sprintf(buf, "datagram\n");
1452 }
1453
1454 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1455 const char *buf, size_t count)
1456 {
1457 struct net_device *dev = to_net_dev(d);
1458 struct ipoib_dev_priv *priv = netdev_priv(dev);
1459
1460 if (!rtnl_trylock())
1461 return restart_syscall();
1462
1463 /* flush paths if we switch modes so that connections are restarted */
1464 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1465 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1466 ipoib_warn(priv, "enabling connected mode "
1467 "will cause multicast packet drops\n");
1468 netdev_update_features(dev);
1469 rtnl_unlock();
1470 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
1471
1472 ipoib_flush_paths(dev);
1473 return count;
1474 }
1475
1476 if (!strcmp(buf, "datagram\n")) {
1477 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1478 netdev_update_features(dev);
1479 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
1480 rtnl_unlock();
1481 ipoib_flush_paths(dev);
1482
1483 return count;
1484 }
1485 rtnl_unlock();
1486
1487 return -EINVAL;
1488 }
1489
1490 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1491
1492 int ipoib_cm_add_mode_attr(struct net_device *dev)
1493 {
1494 return device_create_file(&dev->dev, &dev_attr_mode);
1495 }
1496
1497 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1498 {
1499 struct ipoib_dev_priv *priv = netdev_priv(dev);
1500 struct ib_srq_init_attr srq_init_attr = {
1501 .srq_type = IB_SRQT_BASIC,
1502 .attr = {
1503 .max_wr = ipoib_recvq_size,
1504 .max_sge = max_sge
1505 }
1506 };
1507
1508 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1509 if (IS_ERR(priv->cm.srq)) {
1510 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1511 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1512 priv->ca->name, PTR_ERR(priv->cm.srq));
1513 priv->cm.srq = NULL;
1514 return;
1515 }
1516
1517 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1518 if (!priv->cm.srq_ring) {
1519 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1520 priv->ca->name, ipoib_recvq_size);
1521 ib_destroy_srq(priv->cm.srq);
1522 priv->cm.srq = NULL;
1523 return;
1524 }
1525
1526 }
1527
1528 int ipoib_cm_dev_init(struct net_device *dev)
1529 {
1530 struct ipoib_dev_priv *priv = netdev_priv(dev);
1531 int i, ret;
1532 struct ib_device_attr attr;
1533
1534 INIT_LIST_HEAD(&priv->cm.passive_ids);
1535 INIT_LIST_HEAD(&priv->cm.reap_list);
1536 INIT_LIST_HEAD(&priv->cm.start_list);
1537 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1538 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1539 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1540 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1541 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1542 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1543 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1544 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1545 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1546
1547 skb_queue_head_init(&priv->cm.skb_queue);
1548
1549 ret = ib_query_device(priv->ca, &attr);
1550 if (ret) {
1551 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1552 return ret;
1553 }
1554
1555 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1556
1557 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1558 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1559 if (ipoib_cm_has_srq(dev)) {
1560 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1561 priv->cm.num_frags = attr.max_srq_sge;
1562 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1563 priv->cm.max_cm_mtu, priv->cm.num_frags);
1564 } else {
1565 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1566 priv->cm.num_frags = IPOIB_CM_RX_SG;
1567 }
1568
1569 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1570
1571 if (ipoib_cm_has_srq(dev)) {
1572 for (i = 0; i < ipoib_recvq_size; ++i) {
1573 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1574 priv->cm.num_frags - 1,
1575 priv->cm.srq_ring[i].mapping)) {
1576 ipoib_warn(priv, "failed to allocate "
1577 "receive buffer %d\n", i);
1578 ipoib_cm_dev_cleanup(dev);
1579 return -ENOMEM;
1580 }
1581
1582 if (ipoib_cm_post_receive_srq(dev, i)) {
1583 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1584 "failed for buf %d\n", i);
1585 ipoib_cm_dev_cleanup(dev);
1586 return -EIO;
1587 }
1588 }
1589 }
1590
1591 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1592 return 0;
1593 }
1594
1595 void ipoib_cm_dev_cleanup(struct net_device *dev)
1596 {
1597 struct ipoib_dev_priv *priv = netdev_priv(dev);
1598 int ret;
1599
1600 if (!priv->cm.srq)
1601 return;
1602
1603 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1604
1605 ret = ib_destroy_srq(priv->cm.srq);
1606 if (ret)
1607 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1608
1609 priv->cm.srq = NULL;
1610 if (!priv->cm.srq_ring)
1611 return;
1612
1613 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1614 priv->cm.srq_ring = NULL;
1615 }
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