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Merge tag 'rtc-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
[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 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
67
68 static struct ib_qp_attr ipoib_cm_err_attr = {
69 .qp_state = IB_QPS_ERR
70 };
71
72 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
73
74 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
75 .opcode = IB_WR_SEND,
76 };
77
78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
79 struct ib_cm_event *event);
80
81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
82 u64 mapping[IPOIB_CM_RX_SG])
83 {
84 int i;
85
86 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
87
88 for (i = 0; i < frags; ++i)
89 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
90 }
91
92 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
93 {
94 struct ipoib_dev_priv *priv = netdev_priv(dev);
95 struct ib_recv_wr *bad_wr;
96 int i, ret;
97
98 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
99
100 for (i = 0; i < priv->cm.num_frags; ++i)
101 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
102
103 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
104 if (unlikely(ret)) {
105 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
106 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
107 priv->cm.srq_ring[id].mapping);
108 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
109 priv->cm.srq_ring[id].skb = NULL;
110 }
111
112 return ret;
113 }
114
115 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
116 struct ipoib_cm_rx *rx,
117 struct ib_recv_wr *wr,
118 struct ib_sge *sge, int id)
119 {
120 struct ipoib_dev_priv *priv = netdev_priv(dev);
121 struct ib_recv_wr *bad_wr;
122 int i, ret;
123
124 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
125
126 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
127 sge[i].addr = rx->rx_ring[id].mapping[i];
128
129 ret = ib_post_recv(rx->qp, wr, &bad_wr);
130 if (unlikely(ret)) {
131 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
132 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
133 rx->rx_ring[id].mapping);
134 dev_kfree_skb_any(rx->rx_ring[id].skb);
135 rx->rx_ring[id].skb = NULL;
136 }
137
138 return ret;
139 }
140
141 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
142 struct ipoib_cm_rx_buf *rx_ring,
143 int id, int frags,
144 u64 mapping[IPOIB_CM_RX_SG],
145 gfp_t gfp)
146 {
147 struct ipoib_dev_priv *priv = netdev_priv(dev);
148 struct sk_buff *skb;
149 int i;
150
151 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
152 if (unlikely(!skb))
153 return NULL;
154
155 /*
156 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
157 * IP header to a multiple of 16.
158 */
159 skb_reserve(skb, IPOIB_CM_RX_RESERVE);
160
161 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
162 DMA_FROM_DEVICE);
163 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
164 dev_kfree_skb_any(skb);
165 return NULL;
166 }
167
168 for (i = 0; i < frags; i++) {
169 struct page *page = alloc_page(gfp);
170
171 if (!page)
172 goto partial_error;
173 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
174
175 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
176 0, PAGE_SIZE, DMA_FROM_DEVICE);
177 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
178 goto partial_error;
179 }
180
181 rx_ring[id].skb = skb;
182 return skb;
183
184 partial_error:
185
186 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
187
188 for (; i > 0; --i)
189 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
190
191 dev_kfree_skb_any(skb);
192 return NULL;
193 }
194
195 static void ipoib_cm_free_rx_ring(struct net_device *dev,
196 struct ipoib_cm_rx_buf *rx_ring)
197 {
198 struct ipoib_dev_priv *priv = netdev_priv(dev);
199 int i;
200
201 for (i = 0; i < ipoib_recvq_size; ++i)
202 if (rx_ring[i].skb) {
203 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
204 rx_ring[i].mapping);
205 dev_kfree_skb_any(rx_ring[i].skb);
206 }
207
208 vfree(rx_ring);
209 }
210
211 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
212 {
213 struct ib_send_wr *bad_wr;
214 struct ipoib_cm_rx *p;
215
216 /* We only reserved 1 extra slot in CQ for drain WRs, so
217 * make sure we have at most 1 outstanding WR. */
218 if (list_empty(&priv->cm.rx_flush_list) ||
219 !list_empty(&priv->cm.rx_drain_list))
220 return;
221
222 /*
223 * QPs on flush list are error state. This way, a "flush
224 * error" WC will be immediately generated for each WR we post.
225 */
226 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
227 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
228 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
229 ipoib_warn(priv, "failed to post drain wr\n");
230
231 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
232 }
233
234 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
235 {
236 struct ipoib_cm_rx *p = ctx;
237 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
238 unsigned long flags;
239
240 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
241 return;
242
243 spin_lock_irqsave(&priv->lock, flags);
244 list_move(&p->list, &priv->cm.rx_flush_list);
245 p->state = IPOIB_CM_RX_FLUSH;
246 ipoib_cm_start_rx_drain(priv);
247 spin_unlock_irqrestore(&priv->lock, flags);
248 }
249
250 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
251 struct ipoib_cm_rx *p)
252 {
253 struct ipoib_dev_priv *priv = netdev_priv(dev);
254 struct ib_qp_init_attr attr = {
255 .event_handler = ipoib_cm_rx_event_handler,
256 .send_cq = priv->recv_cq, /* For drain WR */
257 .recv_cq = priv->recv_cq,
258 .srq = priv->cm.srq,
259 .cap.max_send_wr = 1, /* For drain WR */
260 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
261 .sq_sig_type = IB_SIGNAL_ALL_WR,
262 .qp_type = IB_QPT_RC,
263 .qp_context = p,
264 };
265
266 if (!ipoib_cm_has_srq(dev)) {
267 attr.cap.max_recv_wr = ipoib_recvq_size;
268 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
269 }
270
271 return ib_create_qp(priv->pd, &attr);
272 }
273
274 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
275 struct ib_cm_id *cm_id, struct ib_qp *qp,
276 unsigned psn)
277 {
278 struct ipoib_dev_priv *priv = netdev_priv(dev);
279 struct ib_qp_attr qp_attr;
280 int qp_attr_mask, ret;
281
282 qp_attr.qp_state = IB_QPS_INIT;
283 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
284 if (ret) {
285 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
286 return ret;
287 }
288 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
289 if (ret) {
290 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
291 return ret;
292 }
293 qp_attr.qp_state = IB_QPS_RTR;
294 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
295 if (ret) {
296 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
297 return ret;
298 }
299 qp_attr.rq_psn = psn;
300 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
301 if (ret) {
302 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
303 return ret;
304 }
305
306 /*
307 * Current Mellanox HCA firmware won't generate completions
308 * with error for drain WRs unless the QP has been moved to
309 * RTS first. This work-around leaves a window where a QP has
310 * moved to error asynchronously, but this will eventually get
311 * fixed in firmware, so let's not error out if modify QP
312 * fails.
313 */
314 qp_attr.qp_state = IB_QPS_RTS;
315 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
316 if (ret) {
317 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
318 return 0;
319 }
320 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
321 if (ret) {
322 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
323 return 0;
324 }
325
326 return 0;
327 }
328
329 static void ipoib_cm_init_rx_wr(struct net_device *dev,
330 struct ib_recv_wr *wr,
331 struct ib_sge *sge)
332 {
333 struct ipoib_dev_priv *priv = netdev_priv(dev);
334 int i;
335
336 for (i = 0; i < priv->cm.num_frags; ++i)
337 sge[i].lkey = priv->pd->local_dma_lkey;
338
339 sge[0].length = IPOIB_CM_HEAD_SIZE;
340 for (i = 1; i < priv->cm.num_frags; ++i)
341 sge[i].length = PAGE_SIZE;
342
343 wr->next = NULL;
344 wr->sg_list = sge;
345 wr->num_sge = priv->cm.num_frags;
346 }
347
348 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
349 struct ipoib_cm_rx *rx)
350 {
351 struct ipoib_dev_priv *priv = netdev_priv(dev);
352 struct {
353 struct ib_recv_wr wr;
354 struct ib_sge sge[IPOIB_CM_RX_SG];
355 } *t;
356 int ret;
357 int i;
358
359 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
360 if (!rx->rx_ring)
361 return -ENOMEM;
362
363 t = kmalloc(sizeof *t, GFP_KERNEL);
364 if (!t) {
365 ret = -ENOMEM;
366 goto err_free_1;
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 GFP_KERNEL)) {
387 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
388 ret = -ENOMEM;
389 goto err_count;
390 }
391 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
392 if (ret) {
393 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
394 "failed for buf %d\n", i);
395 ret = -EIO;
396 goto err_count;
397 }
398 }
399
400 rx->recv_count = ipoib_recvq_size;
401
402 kfree(t);
403
404 return 0;
405
406 err_count:
407 spin_lock_irq(&priv->lock);
408 --priv->cm.nonsrq_conn_qp;
409 spin_unlock_irq(&priv->lock);
410
411 err_free:
412 kfree(t);
413
414 err_free_1:
415 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
416
417 return ret;
418 }
419
420 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
421 struct ib_qp *qp, struct ib_cm_req_event_param *req,
422 unsigned psn)
423 {
424 struct ipoib_dev_priv *priv = netdev_priv(dev);
425 struct ipoib_cm_data data = {};
426 struct ib_cm_rep_param rep = {};
427
428 data.qpn = cpu_to_be32(priv->qp->qp_num);
429 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
430
431 rep.private_data = &data;
432 rep.private_data_len = sizeof data;
433 rep.flow_control = 0;
434 rep.rnr_retry_count = req->rnr_retry_count;
435 rep.srq = ipoib_cm_has_srq(dev);
436 rep.qp_num = qp->qp_num;
437 rep.starting_psn = psn;
438 return ib_send_cm_rep(cm_id, &rep);
439 }
440
441 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
442 {
443 struct net_device *dev = cm_id->context;
444 struct ipoib_dev_priv *priv = netdev_priv(dev);
445 struct ipoib_cm_rx *p;
446 unsigned psn;
447 int ret;
448
449 ipoib_dbg(priv, "REQ arrived\n");
450 p = kzalloc(sizeof *p, GFP_KERNEL);
451 if (!p)
452 return -ENOMEM;
453 p->dev = dev;
454 p->id = cm_id;
455 cm_id->context = p;
456 p->state = IPOIB_CM_RX_LIVE;
457 p->jiffies = jiffies;
458 INIT_LIST_HEAD(&p->list);
459
460 p->qp = ipoib_cm_create_rx_qp(dev, p);
461 if (IS_ERR(p->qp)) {
462 ret = PTR_ERR(p->qp);
463 goto err_qp;
464 }
465
466 psn = prandom_u32() & 0xffffff;
467 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
468 if (ret)
469 goto err_modify;
470
471 if (!ipoib_cm_has_srq(dev)) {
472 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
473 if (ret)
474 goto err_modify;
475 }
476
477 spin_lock_irq(&priv->lock);
478 queue_delayed_work(priv->wq,
479 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
480 /* Add this entry to passive ids list head, but do not re-add it
481 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
482 p->jiffies = jiffies;
483 if (p->state == IPOIB_CM_RX_LIVE)
484 list_move(&p->list, &priv->cm.passive_ids);
485 spin_unlock_irq(&priv->lock);
486
487 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
488 if (ret) {
489 ipoib_warn(priv, "failed to send REP: %d\n", ret);
490 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
491 ipoib_warn(priv, "unable to move qp to error state\n");
492 }
493 return 0;
494
495 err_modify:
496 ib_destroy_qp(p->qp);
497 err_qp:
498 kfree(p);
499 return ret;
500 }
501
502 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
503 struct ib_cm_event *event)
504 {
505 struct ipoib_cm_rx *p;
506 struct ipoib_dev_priv *priv;
507
508 switch (event->event) {
509 case IB_CM_REQ_RECEIVED:
510 return ipoib_cm_req_handler(cm_id, event);
511 case IB_CM_DREQ_RECEIVED:
512 p = cm_id->context;
513 ib_send_cm_drep(cm_id, NULL, 0);
514 /* Fall through */
515 case IB_CM_REJ_RECEIVED:
516 p = cm_id->context;
517 priv = netdev_priv(p->dev);
518 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
519 ipoib_warn(priv, "unable to move qp to error state\n");
520 /* Fall through */
521 default:
522 return 0;
523 }
524 }
525 /* Adjust length of skb with fragments to match received data */
526 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
527 unsigned int length, struct sk_buff *toskb)
528 {
529 int i, num_frags;
530 unsigned int size;
531
532 /* put header into skb */
533 size = min(length, hdr_space);
534 skb->tail += size;
535 skb->len += size;
536 length -= size;
537
538 num_frags = skb_shinfo(skb)->nr_frags;
539 for (i = 0; i < num_frags; i++) {
540 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
541
542 if (length == 0) {
543 /* don't need this page */
544 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
545 0, PAGE_SIZE);
546 --skb_shinfo(skb)->nr_frags;
547 } else {
548 size = min(length, (unsigned) PAGE_SIZE);
549
550 skb_frag_size_set(frag, size);
551 skb->data_len += size;
552 skb->truesize += size;
553 skb->len += size;
554 length -= size;
555 }
556 }
557 }
558
559 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
560 {
561 struct ipoib_dev_priv *priv = netdev_priv(dev);
562 struct ipoib_cm_rx_buf *rx_ring;
563 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
564 struct sk_buff *skb, *newskb;
565 struct ipoib_cm_rx *p;
566 unsigned long flags;
567 u64 mapping[IPOIB_CM_RX_SG];
568 int frags;
569 int has_srq;
570 struct sk_buff *small_skb;
571
572 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
573 wr_id, wc->status);
574
575 if (unlikely(wr_id >= ipoib_recvq_size)) {
576 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
577 spin_lock_irqsave(&priv->lock, flags);
578 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
579 ipoib_cm_start_rx_drain(priv);
580 queue_work(priv->wq, &priv->cm.rx_reap_task);
581 spin_unlock_irqrestore(&priv->lock, flags);
582 } else
583 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
584 wr_id, ipoib_recvq_size);
585 return;
586 }
587
588 p = wc->qp->qp_context;
589
590 has_srq = ipoib_cm_has_srq(dev);
591 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
592
593 skb = rx_ring[wr_id].skb;
594
595 if (unlikely(wc->status != IB_WC_SUCCESS)) {
596 ipoib_dbg(priv, "cm recv error "
597 "(status=%d, wrid=%d vend_err %x)\n",
598 wc->status, wr_id, wc->vendor_err);
599 ++dev->stats.rx_dropped;
600 if (has_srq)
601 goto repost;
602 else {
603 if (!--p->recv_count) {
604 spin_lock_irqsave(&priv->lock, flags);
605 list_move(&p->list, &priv->cm.rx_reap_list);
606 spin_unlock_irqrestore(&priv->lock, flags);
607 queue_work(priv->wq, &priv->cm.rx_reap_task);
608 }
609 return;
610 }
611 }
612
613 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
614 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
615 spin_lock_irqsave(&priv->lock, flags);
616 p->jiffies = jiffies;
617 /* Move this entry to list head, but do not re-add it
618 * if it has been moved out of list. */
619 if (p->state == IPOIB_CM_RX_LIVE)
620 list_move(&p->list, &priv->cm.passive_ids);
621 spin_unlock_irqrestore(&priv->lock, flags);
622 }
623 }
624
625 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
626 int dlen = wc->byte_len;
627
628 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
629 if (small_skb) {
630 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
631 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
632 dlen, DMA_FROM_DEVICE);
633 skb_copy_from_linear_data(skb, small_skb->data, dlen);
634 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
635 dlen, DMA_FROM_DEVICE);
636 skb_put(small_skb, dlen);
637 skb = small_skb;
638 goto copied;
639 }
640 }
641
642 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
643 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
644
645 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
646 mapping, GFP_ATOMIC);
647 if (unlikely(!newskb)) {
648 /*
649 * If we can't allocate a new RX buffer, dump
650 * this packet and reuse the old buffer.
651 */
652 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
653 ++dev->stats.rx_dropped;
654 goto repost;
655 }
656
657 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
658 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
659
660 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
661 wc->byte_len, wc->slid);
662
663 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
664
665 copied:
666 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
667 skb_add_pseudo_hdr(skb);
668
669 ++dev->stats.rx_packets;
670 dev->stats.rx_bytes += skb->len;
671
672 skb->dev = dev;
673 /* XXX get correct PACKET_ type here */
674 skb->pkt_type = PACKET_HOST;
675 netif_receive_skb(skb);
676
677 repost:
678 if (has_srq) {
679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
681 "for buf %d\n", wr_id);
682 } else {
683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
684 &priv->cm.rx_wr,
685 priv->cm.rx_sge,
686 wr_id))) {
687 --p->recv_count;
688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
689 "for buf %d\n", wr_id);
690 }
691 }
692 }
693
694 static inline int post_send(struct ipoib_dev_priv *priv,
695 struct ipoib_cm_tx *tx,
696 unsigned int wr_id,
697 struct ipoib_tx_buf *tx_req)
698 {
699 struct ib_send_wr *bad_wr;
700
701 ipoib_build_sge(priv, tx_req);
702
703 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
704
705 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
706 }
707
708 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
709 {
710 struct ipoib_dev_priv *priv = netdev_priv(dev);
711 struct ipoib_tx_buf *tx_req;
712 int rc;
713 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
714
715 if (unlikely(skb->len > tx->mtu)) {
716 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
717 skb->len, tx->mtu);
718 ++dev->stats.tx_dropped;
719 ++dev->stats.tx_errors;
720 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
721 return;
722 }
723 if (skb_shinfo(skb)->nr_frags > usable_sge) {
724 if (skb_linearize(skb) < 0) {
725 ipoib_warn(priv, "skb could not be linearized\n");
726 ++dev->stats.tx_dropped;
727 ++dev->stats.tx_errors;
728 dev_kfree_skb_any(skb);
729 return;
730 }
731 /* Does skb_linearize return ok without reducing nr_frags? */
732 if (skb_shinfo(skb)->nr_frags > usable_sge) {
733 ipoib_warn(priv, "too many frags after skb linearize\n");
734 ++dev->stats.tx_dropped;
735 ++dev->stats.tx_errors;
736 dev_kfree_skb_any(skb);
737 return;
738 }
739 }
740 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
741 tx->tx_head, skb->len, tx->qp->qp_num);
742
743 /*
744 * We put the skb into the tx_ring _before_ we call post_send()
745 * because it's entirely possible that the completion handler will
746 * run before we execute anything after the post_send(). That
747 * means we have to make sure everything is properly recorded and
748 * our state is consistent before we call post_send().
749 */
750 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
751 tx_req->skb = skb;
752
753 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
754 ++dev->stats.tx_errors;
755 dev_kfree_skb_any(skb);
756 return;
757 }
758
759 skb_orphan(skb);
760 skb_dst_drop(skb);
761
762 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
763 if (unlikely(rc)) {
764 ipoib_warn(priv, "post_send failed, error %d\n", rc);
765 ++dev->stats.tx_errors;
766 ipoib_dma_unmap_tx(priv, tx_req);
767 dev_kfree_skb_any(skb);
768 } else {
769 netif_trans_update(dev);
770 ++tx->tx_head;
771
772 if (++priv->tx_outstanding == ipoib_sendq_size) {
773 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
774 tx->qp->qp_num);
775 netif_stop_queue(dev);
776 rc = ib_req_notify_cq(priv->send_cq,
777 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
778 if (rc < 0)
779 ipoib_warn(priv, "request notify on send CQ failed\n");
780 else if (rc)
781 ipoib_send_comp_handler(priv->send_cq, dev);
782 }
783 }
784 }
785
786 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
787 {
788 struct ipoib_dev_priv *priv = netdev_priv(dev);
789 struct ipoib_cm_tx *tx = wc->qp->qp_context;
790 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
791 struct ipoib_tx_buf *tx_req;
792 unsigned long flags;
793
794 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
795 wr_id, wc->status);
796
797 if (unlikely(wr_id >= ipoib_sendq_size)) {
798 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
799 wr_id, ipoib_sendq_size);
800 return;
801 }
802
803 tx_req = &tx->tx_ring[wr_id];
804
805 ipoib_dma_unmap_tx(priv, tx_req);
806
807 /* FIXME: is this right? Shouldn't we only increment on success? */
808 ++dev->stats.tx_packets;
809 dev->stats.tx_bytes += tx_req->skb->len;
810
811 dev_kfree_skb_any(tx_req->skb);
812
813 netif_tx_lock(dev);
814
815 ++tx->tx_tail;
816 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
817 netif_queue_stopped(dev) &&
818 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
819 netif_wake_queue(dev);
820
821 if (wc->status != IB_WC_SUCCESS &&
822 wc->status != IB_WC_WR_FLUSH_ERR) {
823 struct ipoib_neigh *neigh;
824
825 if (wc->status != IB_WC_RNR_RETRY_EXC_ERR)
826 ipoib_warn(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
827 wc->status, wr_id, wc->vendor_err);
828 else
829 ipoib_dbg(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
830 wc->status, wr_id, wc->vendor_err);
831
832 spin_lock_irqsave(&priv->lock, flags);
833 neigh = tx->neigh;
834
835 if (neigh) {
836 neigh->cm = NULL;
837 ipoib_neigh_free(neigh);
838
839 tx->neigh = NULL;
840 }
841
842 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
843 list_move(&tx->list, &priv->cm.reap_list);
844 queue_work(priv->wq, &priv->cm.reap_task);
845 }
846
847 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
848
849 spin_unlock_irqrestore(&priv->lock, flags);
850 }
851
852 netif_tx_unlock(dev);
853 }
854
855 int ipoib_cm_dev_open(struct net_device *dev)
856 {
857 struct ipoib_dev_priv *priv = netdev_priv(dev);
858 int ret;
859
860 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
861 return 0;
862
863 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
864 if (IS_ERR(priv->cm.id)) {
865 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
866 ret = PTR_ERR(priv->cm.id);
867 goto err_cm;
868 }
869
870 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
871 0);
872 if (ret) {
873 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
874 IPOIB_CM_IETF_ID | priv->qp->qp_num);
875 goto err_listen;
876 }
877
878 return 0;
879
880 err_listen:
881 ib_destroy_cm_id(priv->cm.id);
882 err_cm:
883 priv->cm.id = NULL;
884 return ret;
885 }
886
887 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
888 {
889 struct ipoib_dev_priv *priv = netdev_priv(dev);
890 struct ipoib_cm_rx *rx, *n;
891 LIST_HEAD(list);
892
893 spin_lock_irq(&priv->lock);
894 list_splice_init(&priv->cm.rx_reap_list, &list);
895 spin_unlock_irq(&priv->lock);
896
897 list_for_each_entry_safe(rx, n, &list, list) {
898 ib_destroy_cm_id(rx->id);
899 ib_destroy_qp(rx->qp);
900 if (!ipoib_cm_has_srq(dev)) {
901 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
902 spin_lock_irq(&priv->lock);
903 --priv->cm.nonsrq_conn_qp;
904 spin_unlock_irq(&priv->lock);
905 }
906 kfree(rx);
907 }
908 }
909
910 void ipoib_cm_dev_stop(struct net_device *dev)
911 {
912 struct ipoib_dev_priv *priv = netdev_priv(dev);
913 struct ipoib_cm_rx *p;
914 unsigned long begin;
915 int ret;
916
917 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
918 return;
919
920 ib_destroy_cm_id(priv->cm.id);
921 priv->cm.id = NULL;
922
923 spin_lock_irq(&priv->lock);
924 while (!list_empty(&priv->cm.passive_ids)) {
925 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
926 list_move(&p->list, &priv->cm.rx_error_list);
927 p->state = IPOIB_CM_RX_ERROR;
928 spin_unlock_irq(&priv->lock);
929 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
930 if (ret)
931 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
932 spin_lock_irq(&priv->lock);
933 }
934
935 /* Wait for all RX to be drained */
936 begin = jiffies;
937
938 while (!list_empty(&priv->cm.rx_error_list) ||
939 !list_empty(&priv->cm.rx_flush_list) ||
940 !list_empty(&priv->cm.rx_drain_list)) {
941 if (time_after(jiffies, begin + 5 * HZ)) {
942 ipoib_warn(priv, "RX drain timing out\n");
943
944 /*
945 * assume the HW is wedged and just free up everything.
946 */
947 list_splice_init(&priv->cm.rx_flush_list,
948 &priv->cm.rx_reap_list);
949 list_splice_init(&priv->cm.rx_error_list,
950 &priv->cm.rx_reap_list);
951 list_splice_init(&priv->cm.rx_drain_list,
952 &priv->cm.rx_reap_list);
953 break;
954 }
955 spin_unlock_irq(&priv->lock);
956 msleep(1);
957 ipoib_drain_cq(dev);
958 spin_lock_irq(&priv->lock);
959 }
960
961 spin_unlock_irq(&priv->lock);
962
963 ipoib_cm_free_rx_reap_list(dev);
964
965 cancel_delayed_work(&priv->cm.stale_task);
966 }
967
968 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
969 {
970 struct ipoib_cm_tx *p = cm_id->context;
971 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
972 struct ipoib_cm_data *data = event->private_data;
973 struct sk_buff_head skqueue;
974 struct ib_qp_attr qp_attr;
975 int qp_attr_mask, ret;
976 struct sk_buff *skb;
977
978 p->mtu = be32_to_cpu(data->mtu);
979
980 if (p->mtu <= IPOIB_ENCAP_LEN) {
981 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
982 p->mtu, IPOIB_ENCAP_LEN);
983 return -EINVAL;
984 }
985
986 qp_attr.qp_state = IB_QPS_RTR;
987 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
988 if (ret) {
989 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
990 return ret;
991 }
992
993 qp_attr.rq_psn = 0 /* FIXME */;
994 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
995 if (ret) {
996 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
997 return ret;
998 }
999
1000 qp_attr.qp_state = IB_QPS_RTS;
1001 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1002 if (ret) {
1003 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1004 return ret;
1005 }
1006 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1007 if (ret) {
1008 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1009 return ret;
1010 }
1011
1012 skb_queue_head_init(&skqueue);
1013
1014 spin_lock_irq(&priv->lock);
1015 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1016 if (p->neigh)
1017 while ((skb = __skb_dequeue(&p->neigh->queue)))
1018 __skb_queue_tail(&skqueue, skb);
1019 spin_unlock_irq(&priv->lock);
1020
1021 while ((skb = __skb_dequeue(&skqueue))) {
1022 skb->dev = p->dev;
1023 ret = dev_queue_xmit(skb);
1024 if (ret)
1025 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1026 __func__, ret);
1027 }
1028
1029 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1030 if (ret) {
1031 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1032 return ret;
1033 }
1034 return 0;
1035 }
1036
1037 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1038 {
1039 struct ipoib_dev_priv *priv = netdev_priv(dev);
1040 struct ib_qp_init_attr attr = {
1041 .send_cq = priv->recv_cq,
1042 .recv_cq = priv->recv_cq,
1043 .srq = priv->cm.srq,
1044 .cap.max_send_wr = ipoib_sendq_size,
1045 .cap.max_send_sge = 1,
1046 .sq_sig_type = IB_SIGNAL_ALL_WR,
1047 .qp_type = IB_QPT_RC,
1048 .qp_context = tx,
1049 .create_flags = IB_QP_CREATE_USE_GFP_NOIO
1050 };
1051
1052 struct ib_qp *tx_qp;
1053
1054 if (dev->features & NETIF_F_SG)
1055 attr.cap.max_send_sge =
1056 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1057
1058 tx_qp = ib_create_qp(priv->pd, &attr);
1059 if (PTR_ERR(tx_qp) == -EINVAL) {
1060 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1061 tx_qp = ib_create_qp(priv->pd, &attr);
1062 }
1063 tx->max_send_sge = attr.cap.max_send_sge;
1064 return tx_qp;
1065 }
1066
1067 static int ipoib_cm_send_req(struct net_device *dev,
1068 struct ib_cm_id *id, struct ib_qp *qp,
1069 u32 qpn,
1070 struct ib_sa_path_rec *pathrec)
1071 {
1072 struct ipoib_dev_priv *priv = netdev_priv(dev);
1073 struct ipoib_cm_data data = {};
1074 struct ib_cm_req_param req = {};
1075
1076 data.qpn = cpu_to_be32(priv->qp->qp_num);
1077 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1078
1079 req.primary_path = pathrec;
1080 req.alternate_path = NULL;
1081 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1082 req.qp_num = qp->qp_num;
1083 req.qp_type = qp->qp_type;
1084 req.private_data = &data;
1085 req.private_data_len = sizeof data;
1086 req.flow_control = 0;
1087
1088 req.starting_psn = 0; /* FIXME */
1089
1090 /*
1091 * Pick some arbitrary defaults here; we could make these
1092 * module parameters if anyone cared about setting them.
1093 */
1094 req.responder_resources = 4;
1095 req.remote_cm_response_timeout = 20;
1096 req.local_cm_response_timeout = 20;
1097 req.retry_count = 0; /* RFC draft warns against retries */
1098 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1099 req.max_cm_retries = 15;
1100 req.srq = ipoib_cm_has_srq(dev);
1101 return ib_send_cm_req(id, &req);
1102 }
1103
1104 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1105 struct ib_cm_id *cm_id, struct ib_qp *qp)
1106 {
1107 struct ipoib_dev_priv *priv = netdev_priv(dev);
1108 struct ib_qp_attr qp_attr;
1109 int qp_attr_mask, ret;
1110 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1111 if (ret) {
1112 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1113 return ret;
1114 }
1115
1116 qp_attr.qp_state = IB_QPS_INIT;
1117 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1118 qp_attr.port_num = priv->port;
1119 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1120
1121 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1122 if (ret) {
1123 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1124 return ret;
1125 }
1126 return 0;
1127 }
1128
1129 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1130 struct ib_sa_path_rec *pathrec)
1131 {
1132 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1133 int ret;
1134
1135 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1136 GFP_NOIO, PAGE_KERNEL);
1137 if (!p->tx_ring) {
1138 ret = -ENOMEM;
1139 goto err_tx;
1140 }
1141 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1142
1143 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1144 if (IS_ERR(p->qp)) {
1145 ret = PTR_ERR(p->qp);
1146 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1147 goto err_qp;
1148 }
1149
1150 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1151 if (IS_ERR(p->id)) {
1152 ret = PTR_ERR(p->id);
1153 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1154 goto err_id;
1155 }
1156
1157 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1158 if (ret) {
1159 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1160 goto err_modify_send;
1161 }
1162
1163 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1164 if (ret) {
1165 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1166 goto err_modify_send;
1167 }
1168
1169 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1170 p->qp->qp_num, pathrec->dgid.raw, qpn);
1171
1172 return 0;
1173
1174 err_modify_send:
1175 ib_destroy_cm_id(p->id);
1176 err_id:
1177 p->id = NULL;
1178 ib_destroy_qp(p->qp);
1179 err_qp:
1180 p->qp = NULL;
1181 vfree(p->tx_ring);
1182 err_tx:
1183 return ret;
1184 }
1185
1186 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1187 {
1188 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1189 struct ipoib_tx_buf *tx_req;
1190 unsigned long begin;
1191
1192 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1193 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1194
1195 if (p->id)
1196 ib_destroy_cm_id(p->id);
1197
1198 if (p->tx_ring) {
1199 /* Wait for all sends to complete */
1200 begin = jiffies;
1201 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1202 if (time_after(jiffies, begin + 5 * HZ)) {
1203 ipoib_warn(priv, "timing out; %d sends not completed\n",
1204 p->tx_head - p->tx_tail);
1205 goto timeout;
1206 }
1207
1208 msleep(1);
1209 }
1210 }
1211
1212 timeout:
1213
1214 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1215 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1216 ipoib_dma_unmap_tx(priv, tx_req);
1217 dev_kfree_skb_any(tx_req->skb);
1218 ++p->tx_tail;
1219 netif_tx_lock_bh(p->dev);
1220 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1221 netif_queue_stopped(p->dev) &&
1222 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1223 netif_wake_queue(p->dev);
1224 netif_tx_unlock_bh(p->dev);
1225 }
1226
1227 if (p->qp)
1228 ib_destroy_qp(p->qp);
1229
1230 vfree(p->tx_ring);
1231 kfree(p);
1232 }
1233
1234 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1235 struct ib_cm_event *event)
1236 {
1237 struct ipoib_cm_tx *tx = cm_id->context;
1238 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1239 struct net_device *dev = priv->dev;
1240 struct ipoib_neigh *neigh;
1241 unsigned long flags;
1242 int ret;
1243
1244 switch (event->event) {
1245 case IB_CM_DREQ_RECEIVED:
1246 ipoib_dbg(priv, "DREQ received.\n");
1247 ib_send_cm_drep(cm_id, NULL, 0);
1248 break;
1249 case IB_CM_REP_RECEIVED:
1250 ipoib_dbg(priv, "REP received.\n");
1251 ret = ipoib_cm_rep_handler(cm_id, event);
1252 if (ret)
1253 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1254 NULL, 0, NULL, 0);
1255 break;
1256 case IB_CM_REQ_ERROR:
1257 case IB_CM_REJ_RECEIVED:
1258 case IB_CM_TIMEWAIT_EXIT:
1259 ipoib_dbg(priv, "CM error %d.\n", event->event);
1260 netif_tx_lock_bh(dev);
1261 spin_lock_irqsave(&priv->lock, flags);
1262 neigh = tx->neigh;
1263
1264 if (neigh) {
1265 neigh->cm = NULL;
1266 ipoib_neigh_free(neigh);
1267
1268 tx->neigh = NULL;
1269 }
1270
1271 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1272 list_move(&tx->list, &priv->cm.reap_list);
1273 queue_work(priv->wq, &priv->cm.reap_task);
1274 }
1275
1276 spin_unlock_irqrestore(&priv->lock, flags);
1277 netif_tx_unlock_bh(dev);
1278 break;
1279 default:
1280 break;
1281 }
1282
1283 return 0;
1284 }
1285
1286 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1287 struct ipoib_neigh *neigh)
1288 {
1289 struct ipoib_dev_priv *priv = netdev_priv(dev);
1290 struct ipoib_cm_tx *tx;
1291
1292 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1293 if (!tx)
1294 return NULL;
1295
1296 neigh->cm = tx;
1297 tx->neigh = neigh;
1298 tx->path = path;
1299 tx->dev = dev;
1300 list_add(&tx->list, &priv->cm.start_list);
1301 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1302 queue_work(priv->wq, &priv->cm.start_task);
1303 return tx;
1304 }
1305
1306 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1307 {
1308 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1309 unsigned long flags;
1310 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1311 spin_lock_irqsave(&priv->lock, flags);
1312 list_move(&tx->list, &priv->cm.reap_list);
1313 queue_work(priv->wq, &priv->cm.reap_task);
1314 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1315 tx->neigh->daddr + 4);
1316 tx->neigh = NULL;
1317 spin_unlock_irqrestore(&priv->lock, flags);
1318 }
1319 }
1320
1321 #define QPN_AND_OPTIONS_OFFSET 4
1322
1323 static void ipoib_cm_tx_start(struct work_struct *work)
1324 {
1325 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1326 cm.start_task);
1327 struct net_device *dev = priv->dev;
1328 struct ipoib_neigh *neigh;
1329 struct ipoib_cm_tx *p;
1330 unsigned long flags;
1331 struct ipoib_path *path;
1332 int ret;
1333
1334 struct ib_sa_path_rec pathrec;
1335 u32 qpn;
1336
1337 netif_tx_lock_bh(dev);
1338 spin_lock_irqsave(&priv->lock, flags);
1339
1340 while (!list_empty(&priv->cm.start_list)) {
1341 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1342 list_del_init(&p->list);
1343 neigh = p->neigh;
1344
1345 qpn = IPOIB_QPN(neigh->daddr);
1346 /*
1347 * As long as the search is with these 2 locks,
1348 * path existence indicates its validity.
1349 */
1350 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1351 if (!path) {
1352 pr_info("%s ignore not valid path %pI6\n",
1353 __func__,
1354 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1355 goto free_neigh;
1356 }
1357 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1358
1359 spin_unlock_irqrestore(&priv->lock, flags);
1360 netif_tx_unlock_bh(dev);
1361
1362 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1363
1364 netif_tx_lock_bh(dev);
1365 spin_lock_irqsave(&priv->lock, flags);
1366
1367 if (ret) {
1368 free_neigh:
1369 neigh = p->neigh;
1370 if (neigh) {
1371 neigh->cm = NULL;
1372 ipoib_neigh_free(neigh);
1373 }
1374 list_del(&p->list);
1375 kfree(p);
1376 }
1377 }
1378
1379 spin_unlock_irqrestore(&priv->lock, flags);
1380 netif_tx_unlock_bh(dev);
1381 }
1382
1383 static void ipoib_cm_tx_reap(struct work_struct *work)
1384 {
1385 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1386 cm.reap_task);
1387 struct net_device *dev = priv->dev;
1388 struct ipoib_cm_tx *p;
1389 unsigned long flags;
1390
1391 netif_tx_lock_bh(dev);
1392 spin_lock_irqsave(&priv->lock, flags);
1393
1394 while (!list_empty(&priv->cm.reap_list)) {
1395 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1396 list_del_init(&p->list);
1397 spin_unlock_irqrestore(&priv->lock, flags);
1398 netif_tx_unlock_bh(dev);
1399 ipoib_cm_tx_destroy(p);
1400 netif_tx_lock_bh(dev);
1401 spin_lock_irqsave(&priv->lock, flags);
1402 }
1403
1404 spin_unlock_irqrestore(&priv->lock, flags);
1405 netif_tx_unlock_bh(dev);
1406 }
1407
1408 static void ipoib_cm_skb_reap(struct work_struct *work)
1409 {
1410 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1411 cm.skb_task);
1412 struct net_device *dev = priv->dev;
1413 struct sk_buff *skb;
1414 unsigned long flags;
1415 unsigned mtu = priv->mcast_mtu;
1416
1417 netif_tx_lock_bh(dev);
1418 spin_lock_irqsave(&priv->lock, flags);
1419
1420 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1421 spin_unlock_irqrestore(&priv->lock, flags);
1422 netif_tx_unlock_bh(dev);
1423
1424 if (skb->protocol == htons(ETH_P_IP))
1425 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1426 #if IS_ENABLED(CONFIG_IPV6)
1427 else if (skb->protocol == htons(ETH_P_IPV6))
1428 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1429 #endif
1430 dev_kfree_skb_any(skb);
1431
1432 netif_tx_lock_bh(dev);
1433 spin_lock_irqsave(&priv->lock, flags);
1434 }
1435
1436 spin_unlock_irqrestore(&priv->lock, flags);
1437 netif_tx_unlock_bh(dev);
1438 }
1439
1440 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1441 unsigned int mtu)
1442 {
1443 struct ipoib_dev_priv *priv = netdev_priv(dev);
1444 int e = skb_queue_empty(&priv->cm.skb_queue);
1445
1446 if (skb_dst(skb))
1447 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1448
1449 skb_queue_tail(&priv->cm.skb_queue, skb);
1450 if (e)
1451 queue_work(priv->wq, &priv->cm.skb_task);
1452 }
1453
1454 static void ipoib_cm_rx_reap(struct work_struct *work)
1455 {
1456 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1457 cm.rx_reap_task)->dev);
1458 }
1459
1460 static void ipoib_cm_stale_task(struct work_struct *work)
1461 {
1462 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1463 cm.stale_task.work);
1464 struct ipoib_cm_rx *p;
1465 int ret;
1466
1467 spin_lock_irq(&priv->lock);
1468 while (!list_empty(&priv->cm.passive_ids)) {
1469 /* List is sorted by LRU, start from tail,
1470 * stop when we see a recently used entry */
1471 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1472 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1473 break;
1474 list_move(&p->list, &priv->cm.rx_error_list);
1475 p->state = IPOIB_CM_RX_ERROR;
1476 spin_unlock_irq(&priv->lock);
1477 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1478 if (ret)
1479 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1480 spin_lock_irq(&priv->lock);
1481 }
1482
1483 if (!list_empty(&priv->cm.passive_ids))
1484 queue_delayed_work(priv->wq,
1485 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1486 spin_unlock_irq(&priv->lock);
1487 }
1488
1489 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1490 char *buf)
1491 {
1492 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1493
1494 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1495 return sprintf(buf, "connected\n");
1496 else
1497 return sprintf(buf, "datagram\n");
1498 }
1499
1500 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1501 const char *buf, size_t count)
1502 {
1503 struct net_device *dev = to_net_dev(d);
1504 int ret;
1505 struct ipoib_dev_priv *priv = netdev_priv(dev);
1506
1507 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1508 return -EPERM;
1509
1510 if (!rtnl_trylock())
1511 return restart_syscall();
1512
1513 ret = ipoib_set_mode(dev, buf);
1514
1515 /* The assumption is that the function ipoib_set_mode returned
1516 * with the rtnl held by it, if not the value -EBUSY returned,
1517 * then no need to rtnl_unlock
1518 */
1519 if (ret != -EBUSY)
1520 rtnl_unlock();
1521
1522 return (!ret || ret == -EBUSY) ? count : ret;
1523 }
1524
1525 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1526
1527 int ipoib_cm_add_mode_attr(struct net_device *dev)
1528 {
1529 return device_create_file(&dev->dev, &dev_attr_mode);
1530 }
1531
1532 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1533 {
1534 struct ipoib_dev_priv *priv = netdev_priv(dev);
1535 struct ib_srq_init_attr srq_init_attr = {
1536 .srq_type = IB_SRQT_BASIC,
1537 .attr = {
1538 .max_wr = ipoib_recvq_size,
1539 .max_sge = max_sge
1540 }
1541 };
1542
1543 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1544 if (IS_ERR(priv->cm.srq)) {
1545 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1546 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1547 priv->ca->name, PTR_ERR(priv->cm.srq));
1548 priv->cm.srq = NULL;
1549 return;
1550 }
1551
1552 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1553 if (!priv->cm.srq_ring) {
1554 ib_destroy_srq(priv->cm.srq);
1555 priv->cm.srq = NULL;
1556 return;
1557 }
1558
1559 }
1560
1561 int ipoib_cm_dev_init(struct net_device *dev)
1562 {
1563 struct ipoib_dev_priv *priv = netdev_priv(dev);
1564 int max_srq_sge, i;
1565
1566 INIT_LIST_HEAD(&priv->cm.passive_ids);
1567 INIT_LIST_HEAD(&priv->cm.reap_list);
1568 INIT_LIST_HEAD(&priv->cm.start_list);
1569 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1570 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1571 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1572 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1573 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1574 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1575 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1576 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1577 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1578
1579 skb_queue_head_init(&priv->cm.skb_queue);
1580
1581 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1582
1583 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1584 ipoib_cm_create_srq(dev, max_srq_sge);
1585 if (ipoib_cm_has_srq(dev)) {
1586 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1587 priv->cm.num_frags = max_srq_sge;
1588 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1589 priv->cm.max_cm_mtu, priv->cm.num_frags);
1590 } else {
1591 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1592 priv->cm.num_frags = IPOIB_CM_RX_SG;
1593 }
1594
1595 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1596
1597 if (ipoib_cm_has_srq(dev)) {
1598 for (i = 0; i < ipoib_recvq_size; ++i) {
1599 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1600 priv->cm.num_frags - 1,
1601 priv->cm.srq_ring[i].mapping,
1602 GFP_KERNEL)) {
1603 ipoib_warn(priv, "failed to allocate "
1604 "receive buffer %d\n", i);
1605 ipoib_cm_dev_cleanup(dev);
1606 return -ENOMEM;
1607 }
1608
1609 if (ipoib_cm_post_receive_srq(dev, i)) {
1610 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1611 "failed for buf %d\n", i);
1612 ipoib_cm_dev_cleanup(dev);
1613 return -EIO;
1614 }
1615 }
1616 }
1617
1618 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1619 return 0;
1620 }
1621
1622 void ipoib_cm_dev_cleanup(struct net_device *dev)
1623 {
1624 struct ipoib_dev_priv *priv = netdev_priv(dev);
1625 int ret;
1626
1627 if (!priv->cm.srq)
1628 return;
1629
1630 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1631
1632 ret = ib_destroy_srq(priv->cm.srq);
1633 if (ret)
1634 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1635
1636 priv->cm.srq = NULL;
1637 if (!priv->cm.srq_ring)
1638 return;
1639
1640 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1641 priv->cm.srq_ring = NULL;
1642 }
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