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#include <linux/sched/signal.h>
42#include <linux/sched/mm.h>
43
44#include "ipoib.h"
45
46int ipoib_max_conn_qp = 128;
47
48module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
49MODULE_PARM_DESC(max_nonsrq_conn_qp,
50 "Max number of connected-mode QPs per interface "
51 "(applied only if shared receive queue is not available)");
52
53#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
54static int data_debug_level;
55
56module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
57MODULE_PARM_DESC(cm_data_debug_level,
58 "Enable data path debug tracing for connected mode if > 0");
59#endif
60
61#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
62
63#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
64#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
65#define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
66#define IPOIB_CM_RX_UPDATE_MASK (0x3)
67
68#define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
69
70static struct ib_qp_attr ipoib_cm_err_attr = {
71 .qp_state = IB_QPS_ERR
72};
73
74#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
75
76static struct ib_send_wr ipoib_cm_rx_drain_wr = {
77 .opcode = IB_WR_SEND,
78};
79
80static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
81 const struct ib_cm_event *event);
82
83static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
84 u64 mapping[IPOIB_CM_RX_SG])
85{
86 int i;
87
88 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
89
90 for (i = 0; i < frags; ++i)
91 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
92}
93
94static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
95{
96 struct ipoib_dev_priv *priv = ipoib_priv(dev);
97 int i, ret;
98
99 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
100
101 for (i = 0; i < priv->cm.num_frags; ++i)
102 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
103
104 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, NULL);
105 if (unlikely(ret)) {
106 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
107 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
108 priv->cm.srq_ring[id].mapping);
109 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
110 priv->cm.srq_ring[id].skb = NULL;
111 }
112
113 return ret;
114}
115
116static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
117 struct ipoib_cm_rx *rx,
118 struct ib_recv_wr *wr,
119 struct ib_sge *sge, int id)
120{
121 struct ipoib_dev_priv *priv = ipoib_priv(dev);
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, NULL);
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
141static 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 = ipoib_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
184partial_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
195static 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 = ipoib_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
211static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
212{
213 struct ipoib_cm_rx *p;
214
215 /* We only reserved 1 extra slot in CQ for drain WRs, so
216 * make sure we have at most 1 outstanding WR. */
217 if (list_empty(&priv->cm.rx_flush_list) ||
218 !list_empty(&priv->cm.rx_drain_list))
219 return;
220
221 /*
222 * QPs on flush list are error state. This way, a "flush
223 * error" WC will be immediately generated for each WR we post.
224 */
225 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
226 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
227 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, NULL))
228 ipoib_warn(priv, "failed to post drain wr\n");
229
230 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
231}
232
233static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
234{
235 struct ipoib_cm_rx *p = ctx;
236 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
237 unsigned long flags;
238
239 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
240 return;
241
242 spin_lock_irqsave(&priv->lock, flags);
243 list_move(&p->list, &priv->cm.rx_flush_list);
244 p->state = IPOIB_CM_RX_FLUSH;
245 ipoib_cm_start_rx_drain(priv);
246 spin_unlock_irqrestore(&priv->lock, flags);
247}
248
249static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
250 struct ipoib_cm_rx *p)
251{
252 struct ipoib_dev_priv *priv = ipoib_priv(dev);
253 struct ib_qp_init_attr attr = {
254 .event_handler = ipoib_cm_rx_event_handler,
255 .send_cq = priv->recv_cq, /* For drain WR */
256 .recv_cq = priv->recv_cq,
257 .srq = priv->cm.srq,
258 .cap.max_send_wr = 1, /* For drain WR */
259 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
260 .sq_sig_type = IB_SIGNAL_ALL_WR,
261 .qp_type = IB_QPT_RC,
262 .qp_context = p,
263 };
264
265 if (!ipoib_cm_has_srq(dev)) {
266 attr.cap.max_recv_wr = ipoib_recvq_size;
267 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
268 }
269
270 return ib_create_qp(priv->pd, &attr);
271}
272
273static int ipoib_cm_modify_rx_qp(struct net_device *dev,
274 struct ib_cm_id *cm_id, struct ib_qp *qp,
275 unsigned int psn)
276{
277 struct ipoib_dev_priv *priv = ipoib_priv(dev);
278 struct ib_qp_attr qp_attr;
279 int qp_attr_mask, ret;
280
281 qp_attr.qp_state = IB_QPS_INIT;
282 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
283 if (ret) {
284 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
285 return ret;
286 }
287 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
288 if (ret) {
289 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
290 return ret;
291 }
292 qp_attr.qp_state = IB_QPS_RTR;
293 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
294 if (ret) {
295 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
296 return ret;
297 }
298 qp_attr.rq_psn = psn;
299 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
300 if (ret) {
301 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
302 return ret;
303 }
304
305 /*
306 * Current Mellanox HCA firmware won't generate completions
307 * with error for drain WRs unless the QP has been moved to
308 * RTS first. This work-around leaves a window where a QP has
309 * moved to error asynchronously, but this will eventually get
310 * fixed in firmware, so let's not error out if modify QP
311 * fails.
312 */
313 qp_attr.qp_state = IB_QPS_RTS;
314 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
315 if (ret) {
316 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
317 return 0;
318 }
319 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
320 if (ret) {
321 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
322 return 0;
323 }
324
325 return 0;
326}
327
328static void ipoib_cm_init_rx_wr(struct net_device *dev,
329 struct ib_recv_wr *wr,
330 struct ib_sge *sge)
331{
332 struct ipoib_dev_priv *priv = ipoib_priv(dev);
333 int i;
334
335 for (i = 0; i < priv->cm.num_frags; ++i)
336 sge[i].lkey = priv->pd->local_dma_lkey;
337
338 sge[0].length = IPOIB_CM_HEAD_SIZE;
339 for (i = 1; i < priv->cm.num_frags; ++i)
340 sge[i].length = PAGE_SIZE;
341
342 wr->next = NULL;
343 wr->sg_list = sge;
344 wr->num_sge = priv->cm.num_frags;
345}
346
347static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
348 struct ipoib_cm_rx *rx)
349{
350 struct ipoib_dev_priv *priv = ipoib_priv(dev);
351 struct {
352 struct ib_recv_wr wr;
353 struct ib_sge sge[IPOIB_CM_RX_SG];
354 } *t;
355 int ret;
356 int i;
357
358 rx->rx_ring = vzalloc(array_size(ipoib_recvq_size,
359 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
406err_count:
407 spin_lock_irq(&priv->lock);
408 --priv->cm.nonsrq_conn_qp;
409 spin_unlock_irq(&priv->lock);
410
411err_free:
412 kfree(t);
413
414err_free_1:
415 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
416
417 return ret;
418}
419
420static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
421 struct ib_qp *qp,
422 const struct ib_cm_req_event_param *req,
423 unsigned int psn)
424{
425 struct ipoib_dev_priv *priv = ipoib_priv(dev);
426 struct ipoib_cm_data data = {};
427 struct ib_cm_rep_param rep = {};
428
429 data.qpn = cpu_to_be32(priv->qp->qp_num);
430 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
431
432 rep.private_data = &data;
433 rep.private_data_len = sizeof(data);
434 rep.flow_control = 0;
435 rep.rnr_retry_count = req->rnr_retry_count;
436 rep.srq = ipoib_cm_has_srq(dev);
437 rep.qp_num = qp->qp_num;
438 rep.starting_psn = psn;
439 return ib_send_cm_rep(cm_id, &rep);
440}
441
442static int ipoib_cm_req_handler(struct ib_cm_id *cm_id,
443 const struct ib_cm_event *event)
444{
445 struct net_device *dev = cm_id->context;
446 struct ipoib_dev_priv *priv = ipoib_priv(dev);
447 struct ipoib_cm_rx *p;
448 unsigned int psn;
449 int ret;
450
451 ipoib_dbg(priv, "REQ arrived\n");
452 p = kzalloc(sizeof(*p), GFP_KERNEL);
453 if (!p)
454 return -ENOMEM;
455 p->dev = dev;
456 p->id = cm_id;
457 cm_id->context = p;
458 p->state = IPOIB_CM_RX_LIVE;
459 p->jiffies = jiffies;
460 INIT_LIST_HEAD(&p->list);
461
462 p->qp = ipoib_cm_create_rx_qp(dev, p);
463 if (IS_ERR(p->qp)) {
464 ret = PTR_ERR(p->qp);
465 goto err_qp;
466 }
467
468 psn = prandom_u32() & 0xffffff;
469 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
470 if (ret)
471 goto err_modify;
472
473 if (!ipoib_cm_has_srq(dev)) {
474 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
475 if (ret)
476 goto err_modify;
477 }
478
479 spin_lock_irq(&priv->lock);
480 queue_delayed_work(priv->wq,
481 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
482 /* Add this entry to passive ids list head, but do not re-add it
483 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
484 p->jiffies = jiffies;
485 if (p->state == IPOIB_CM_RX_LIVE)
486 list_move(&p->list, &priv->cm.passive_ids);
487 spin_unlock_irq(&priv->lock);
488
489 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
490 if (ret) {
491 ipoib_warn(priv, "failed to send REP: %d\n", ret);
492 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
493 ipoib_warn(priv, "unable to move qp to error state\n");
494 }
495 return 0;
496
497err_modify:
498 ib_destroy_qp(p->qp);
499err_qp:
500 kfree(p);
501 return ret;
502}
503
504static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
505 const struct ib_cm_event *event)
506{
507 struct ipoib_cm_rx *p;
508 struct ipoib_dev_priv *priv;
509
510 switch (event->event) {
511 case IB_CM_REQ_RECEIVED:
512 return ipoib_cm_req_handler(cm_id, event);
513 case IB_CM_DREQ_RECEIVED:
514 ib_send_cm_drep(cm_id, NULL, 0);
515 /* Fall through */
516 case IB_CM_REJ_RECEIVED:
517 p = cm_id->context;
518 priv = ipoib_priv(p->dev);
519 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
520 ipoib_warn(priv, "unable to move qp to error state\n");
521 /* Fall through */
522 default:
523 return 0;
524 }
525}
526/* Adjust length of skb with fragments to match received data */
527static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
528 unsigned int length, struct sk_buff *toskb)
529{
530 int i, num_frags;
531 unsigned int size;
532
533 /* put header into skb */
534 size = min(length, hdr_space);
535 skb->tail += size;
536 skb->len += size;
537 length -= size;
538
539 num_frags = skb_shinfo(skb)->nr_frags;
540 for (i = 0; i < num_frags; i++) {
541 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
542
543 if (length == 0) {
544 /* don't need this page */
545 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
546 0, PAGE_SIZE);
547 --skb_shinfo(skb)->nr_frags;
548 } else {
549 size = min_t(unsigned int, length, PAGE_SIZE);
550
551 skb_frag_size_set(frag, size);
552 skb->data_len += size;
553 skb->truesize += size;
554 skb->len += size;
555 length -= size;
556 }
557 }
558}
559
560void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
561{
562 struct ipoib_dev_priv *priv = ipoib_priv(dev);
563 struct ipoib_cm_rx_buf *rx_ring;
564 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
565 struct sk_buff *skb, *newskb;
566 struct ipoib_cm_rx *p;
567 unsigned long flags;
568 u64 mapping[IPOIB_CM_RX_SG];
569 int frags;
570 int has_srq;
571 struct sk_buff *small_skb;
572
573 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
574 wr_id, wc->status);
575
576 if (unlikely(wr_id >= ipoib_recvq_size)) {
577 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
578 spin_lock_irqsave(&priv->lock, flags);
579 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
580 ipoib_cm_start_rx_drain(priv);
581 queue_work(priv->wq, &priv->cm.rx_reap_task);
582 spin_unlock_irqrestore(&priv->lock, flags);
583 } else
584 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
585 wr_id, ipoib_recvq_size);
586 return;
587 }
588
589 p = wc->qp->qp_context;
590
591 has_srq = ipoib_cm_has_srq(dev);
592 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
593
594 skb = rx_ring[wr_id].skb;
595
596 if (unlikely(wc->status != IB_WC_SUCCESS)) {
597 ipoib_dbg(priv,
598 "cm recv error (status=%d, wrid=%d vend_err %#x)\n",
599 wc->status, wr_id, wc->vendor_err);
600 ++dev->stats.rx_dropped;
601 if (has_srq)
602 goto repost;
603 else {
604 if (!--p->recv_count) {
605 spin_lock_irqsave(&priv->lock, flags);
606 list_move(&p->list, &priv->cm.rx_reap_list);
607 spin_unlock_irqrestore(&priv->lock, flags);
608 queue_work(priv->wq, &priv->cm.rx_reap_task);
609 }
610 return;
611 }
612 }
613
614 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
615 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
616 spin_lock_irqsave(&priv->lock, flags);
617 p->jiffies = jiffies;
618 /* Move this entry to list head, but do not re-add it
619 * if it has been moved out of list. */
620 if (p->state == IPOIB_CM_RX_LIVE)
621 list_move(&p->list, &priv->cm.passive_ids);
622 spin_unlock_irqrestore(&priv->lock, flags);
623 }
624 }
625
626 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
627 int dlen = wc->byte_len;
628
629 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
630 if (small_skb) {
631 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
632 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
633 dlen, DMA_FROM_DEVICE);
634 skb_copy_from_linear_data(skb, small_skb->data, dlen);
635 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
636 dlen, DMA_FROM_DEVICE);
637 skb_put(small_skb, dlen);
638 skb = small_skb;
639 goto copied;
640 }
641 }
642
643 frags = PAGE_ALIGN(wc->byte_len -
644 min_t(u32, wc->byte_len, IPOIB_CM_HEAD_SIZE)) /
645 PAGE_SIZE;
646
647 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
648 mapping, GFP_ATOMIC);
649 if (unlikely(!newskb)) {
650 /*
651 * If we can't allocate a new RX buffer, dump
652 * this packet and reuse the old buffer.
653 */
654 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
655 ++dev->stats.rx_dropped;
656 goto repost;
657 }
658
659 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
660 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof(*mapping));
661
662 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
663 wc->byte_len, wc->slid);
664
665 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
666
667copied:
668 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
669 skb_add_pseudo_hdr(skb);
670
671 ++dev->stats.rx_packets;
672 dev->stats.rx_bytes += skb->len;
673
674 skb->dev = dev;
675 /* XXX get correct PACKET_ type here */
676 skb->pkt_type = PACKET_HOST;
677 netif_receive_skb(skb);
678
679repost:
680 if (has_srq) {
681 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
682 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
683 "for buf %d\n", wr_id);
684 } else {
685 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
686 &priv->cm.rx_wr,
687 priv->cm.rx_sge,
688 wr_id))) {
689 --p->recv_count;
690 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
691 "for buf %d\n", wr_id);
692 }
693 }
694}
695
696static inline int post_send(struct ipoib_dev_priv *priv,
697 struct ipoib_cm_tx *tx,
698 unsigned int wr_id,
699 struct ipoib_tx_buf *tx_req)
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, NULL);
706}
707
708void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
709{
710 struct ipoib_dev_priv *priv = ipoib_priv(dev);
711 struct ipoib_tx_buf *tx_req;
712 int rc;
713 unsigned int 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 if ((priv->tx_head - priv->tx_tail) == ipoib_sendq_size - 1) {
760 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
761 tx->qp->qp_num);
762 netif_stop_queue(dev);
763 }
764
765 skb_orphan(skb);
766 skb_dst_drop(skb);
767
768 if (netif_queue_stopped(dev)) {
769 rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
770 IB_CQ_REPORT_MISSED_EVENTS);
771 if (unlikely(rc < 0))
772 ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
773 else if (rc)
774 napi_schedule(&priv->send_napi);
775 }
776
777 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
778 if (unlikely(rc)) {
779 ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
780 ++dev->stats.tx_errors;
781 ipoib_dma_unmap_tx(priv, tx_req);
782 dev_kfree_skb_any(skb);
783
784 if (netif_queue_stopped(dev))
785 netif_wake_queue(dev);
786 } else {
787 netif_trans_update(dev);
788 ++tx->tx_head;
789 ++priv->tx_head;
790 }
791}
792
793void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
794{
795 struct ipoib_dev_priv *priv = ipoib_priv(dev);
796 struct ipoib_cm_tx *tx = wc->qp->qp_context;
797 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
798 struct ipoib_tx_buf *tx_req;
799 unsigned long flags;
800
801 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
802 wr_id, wc->status);
803
804 if (unlikely(wr_id >= ipoib_sendq_size)) {
805 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
806 wr_id, ipoib_sendq_size);
807 return;
808 }
809
810 tx_req = &tx->tx_ring[wr_id];
811
812 ipoib_dma_unmap_tx(priv, tx_req);
813
814 /* FIXME: is this right? Shouldn't we only increment on success? */
815 ++dev->stats.tx_packets;
816 dev->stats.tx_bytes += tx_req->skb->len;
817
818 dev_kfree_skb_any(tx_req->skb);
819
820 netif_tx_lock(dev);
821
822 ++tx->tx_tail;
823 ++priv->tx_tail;
824
825 if (unlikely(netif_queue_stopped(dev) &&
826 (priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1 &&
827 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
828 netif_wake_queue(dev);
829
830 if (wc->status != IB_WC_SUCCESS &&
831 wc->status != IB_WC_WR_FLUSH_ERR) {
832 struct ipoib_neigh *neigh;
833
834 /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
835 * so don't make waves.
836 */
837 if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
838 wc->status == IB_WC_RETRY_EXC_ERR)
839 ipoib_dbg(priv,
840 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
841 __func__, wc->status, wr_id, wc->vendor_err);
842 else
843 ipoib_warn(priv,
844 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
845 __func__, wc->status, wr_id, wc->vendor_err);
846
847 spin_lock_irqsave(&priv->lock, flags);
848 neigh = tx->neigh;
849
850 if (neigh) {
851 neigh->cm = NULL;
852 ipoib_neigh_free(neigh);
853
854 tx->neigh = NULL;
855 }
856
857 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
858 list_move(&tx->list, &priv->cm.reap_list);
859 queue_work(priv->wq, &priv->cm.reap_task);
860 }
861
862 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
863
864 spin_unlock_irqrestore(&priv->lock, flags);
865 }
866
867 netif_tx_unlock(dev);
868}
869
870int ipoib_cm_dev_open(struct net_device *dev)
871{
872 struct ipoib_dev_priv *priv = ipoib_priv(dev);
873 int ret;
874
875 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
876 return 0;
877
878 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
879 if (IS_ERR(priv->cm.id)) {
880 pr_warn("%s: failed to create CM ID\n", priv->ca->name);
881 ret = PTR_ERR(priv->cm.id);
882 goto err_cm;
883 }
884
885 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
886 0);
887 if (ret) {
888 pr_warn("%s: failed to listen on ID 0x%llx\n", priv->ca->name,
889 IPOIB_CM_IETF_ID | priv->qp->qp_num);
890 goto err_listen;
891 }
892
893 return 0;
894
895err_listen:
896 ib_destroy_cm_id(priv->cm.id);
897err_cm:
898 priv->cm.id = NULL;
899 return ret;
900}
901
902static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
903{
904 struct ipoib_dev_priv *priv = ipoib_priv(dev);
905 struct ipoib_cm_rx *rx, *n;
906 LIST_HEAD(list);
907
908 spin_lock_irq(&priv->lock);
909 list_splice_init(&priv->cm.rx_reap_list, &list);
910 spin_unlock_irq(&priv->lock);
911
912 list_for_each_entry_safe(rx, n, &list, list) {
913 ib_destroy_cm_id(rx->id);
914 ib_destroy_qp(rx->qp);
915 if (!ipoib_cm_has_srq(dev)) {
916 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
917 spin_lock_irq(&priv->lock);
918 --priv->cm.nonsrq_conn_qp;
919 spin_unlock_irq(&priv->lock);
920 }
921 kfree(rx);
922 }
923}
924
925void ipoib_cm_dev_stop(struct net_device *dev)
926{
927 struct ipoib_dev_priv *priv = ipoib_priv(dev);
928 struct ipoib_cm_rx *p;
929 unsigned long begin;
930 int ret;
931
932 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
933 return;
934
935 ib_destroy_cm_id(priv->cm.id);
936 priv->cm.id = NULL;
937
938 spin_lock_irq(&priv->lock);
939 while (!list_empty(&priv->cm.passive_ids)) {
940 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
941 list_move(&p->list, &priv->cm.rx_error_list);
942 p->state = IPOIB_CM_RX_ERROR;
943 spin_unlock_irq(&priv->lock);
944 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
945 if (ret)
946 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
947 spin_lock_irq(&priv->lock);
948 }
949
950 /* Wait for all RX to be drained */
951 begin = jiffies;
952
953 while (!list_empty(&priv->cm.rx_error_list) ||
954 !list_empty(&priv->cm.rx_flush_list) ||
955 !list_empty(&priv->cm.rx_drain_list)) {
956 if (time_after(jiffies, begin + 5 * HZ)) {
957 ipoib_warn(priv, "RX drain timing out\n");
958
959 /*
960 * assume the HW is wedged and just free up everything.
961 */
962 list_splice_init(&priv->cm.rx_flush_list,
963 &priv->cm.rx_reap_list);
964 list_splice_init(&priv->cm.rx_error_list,
965 &priv->cm.rx_reap_list);
966 list_splice_init(&priv->cm.rx_drain_list,
967 &priv->cm.rx_reap_list);
968 break;
969 }
970 spin_unlock_irq(&priv->lock);
971 usleep_range(1000, 2000);
972 ipoib_drain_cq(dev);
973 spin_lock_irq(&priv->lock);
974 }
975
976 spin_unlock_irq(&priv->lock);
977
978 ipoib_cm_free_rx_reap_list(dev);
979
980 cancel_delayed_work(&priv->cm.stale_task);
981}
982
983static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id,
984 const struct ib_cm_event *event)
985{
986 struct ipoib_cm_tx *p = cm_id->context;
987 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
988 struct ipoib_cm_data *data = event->private_data;
989 struct sk_buff_head skqueue;
990 struct ib_qp_attr qp_attr;
991 int qp_attr_mask, ret;
992 struct sk_buff *skb;
993
994 p->mtu = be32_to_cpu(data->mtu);
995
996 if (p->mtu <= IPOIB_ENCAP_LEN) {
997 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
998 p->mtu, IPOIB_ENCAP_LEN);
999 return -EINVAL;
1000 }
1001
1002 qp_attr.qp_state = IB_QPS_RTR;
1003 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1004 if (ret) {
1005 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
1006 return ret;
1007 }
1008
1009 qp_attr.rq_psn = 0 /* FIXME */;
1010 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1011 if (ret) {
1012 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1013 return ret;
1014 }
1015
1016 qp_attr.qp_state = IB_QPS_RTS;
1017 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1018 if (ret) {
1019 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1020 return ret;
1021 }
1022 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1023 if (ret) {
1024 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1025 return ret;
1026 }
1027
1028 skb_queue_head_init(&skqueue);
1029
1030 netif_tx_lock_bh(p->dev);
1031 spin_lock_irq(&priv->lock);
1032 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1033 if (p->neigh)
1034 while ((skb = __skb_dequeue(&p->neigh->queue)))
1035 __skb_queue_tail(&skqueue, skb);
1036 spin_unlock_irq(&priv->lock);
1037 netif_tx_unlock_bh(p->dev);
1038
1039 while ((skb = __skb_dequeue(&skqueue))) {
1040 skb->dev = p->dev;
1041 ret = dev_queue_xmit(skb);
1042 if (ret)
1043 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1044 __func__, ret);
1045 }
1046
1047 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1048 if (ret) {
1049 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1050 return ret;
1051 }
1052 return 0;
1053}
1054
1055static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1056{
1057 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1058 struct ib_qp_init_attr attr = {
1059 .send_cq = priv->send_cq,
1060 .recv_cq = priv->recv_cq,
1061 .srq = priv->cm.srq,
1062 .cap.max_send_wr = ipoib_sendq_size,
1063 .cap.max_send_sge = 1,
1064 .sq_sig_type = IB_SIGNAL_ALL_WR,
1065 .qp_type = IB_QPT_RC,
1066 .qp_context = tx,
1067 .create_flags = 0
1068 };
1069 struct ib_qp *tx_qp;
1070
1071 if (dev->features & NETIF_F_SG)
1072 attr.cap.max_send_sge = min_t(u32, priv->ca->attrs.max_send_sge,
1073 MAX_SKB_FRAGS + 1);
1074
1075 tx_qp = ib_create_qp(priv->pd, &attr);
1076 tx->max_send_sge = attr.cap.max_send_sge;
1077 return tx_qp;
1078}
1079
1080static int ipoib_cm_send_req(struct net_device *dev,
1081 struct ib_cm_id *id, struct ib_qp *qp,
1082 u32 qpn,
1083 struct sa_path_rec *pathrec)
1084{
1085 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1086 struct ipoib_cm_data data = {};
1087 struct ib_cm_req_param req = {};
1088
1089 data.qpn = cpu_to_be32(priv->qp->qp_num);
1090 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1091
1092 req.primary_path = pathrec;
1093 req.alternate_path = NULL;
1094 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1095 req.qp_num = qp->qp_num;
1096 req.qp_type = qp->qp_type;
1097 req.private_data = &data;
1098 req.private_data_len = sizeof(data);
1099 req.flow_control = 0;
1100
1101 req.starting_psn = 0; /* FIXME */
1102
1103 /*
1104 * Pick some arbitrary defaults here; we could make these
1105 * module parameters if anyone cared about setting them.
1106 */
1107 req.responder_resources = 4;
1108 req.remote_cm_response_timeout = 20;
1109 req.local_cm_response_timeout = 20;
1110 req.retry_count = 0; /* RFC draft warns against retries */
1111 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1112 req.max_cm_retries = 15;
1113 req.srq = ipoib_cm_has_srq(dev);
1114 return ib_send_cm_req(id, &req);
1115}
1116
1117static int ipoib_cm_modify_tx_init(struct net_device *dev,
1118 struct ib_cm_id *cm_id, struct ib_qp *qp)
1119{
1120 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1121 struct ib_qp_attr qp_attr;
1122 int qp_attr_mask, ret;
1123 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1124 if (ret) {
1125 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1126 return ret;
1127 }
1128
1129 qp_attr.qp_state = IB_QPS_INIT;
1130 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1131 qp_attr.port_num = priv->port;
1132 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1133
1134 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1135 if (ret) {
1136 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1137 return ret;
1138 }
1139 return 0;
1140}
1141
1142static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1143 struct sa_path_rec *pathrec)
1144{
1145 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1146 unsigned int noio_flag;
1147 int ret;
1148
1149 noio_flag = memalloc_noio_save();
1150 p->tx_ring = vzalloc(array_size(ipoib_sendq_size, sizeof(*p->tx_ring)));
1151 if (!p->tx_ring) {
1152 memalloc_noio_restore(noio_flag);
1153 ret = -ENOMEM;
1154 goto err_tx;
1155 }
1156 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof(*p->tx_ring));
1157
1158 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1159 memalloc_noio_restore(noio_flag);
1160 if (IS_ERR(p->qp)) {
1161 ret = PTR_ERR(p->qp);
1162 ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1163 goto err_qp;
1164 }
1165
1166 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1167 if (IS_ERR(p->id)) {
1168 ret = PTR_ERR(p->id);
1169 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1170 goto err_id;
1171 }
1172
1173 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1174 if (ret) {
1175 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1176 goto err_modify_send;
1177 }
1178
1179 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1180 if (ret) {
1181 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1182 goto err_modify_send;
1183 }
1184
1185 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1186 p->qp->qp_num, pathrec->dgid.raw, qpn);
1187
1188 return 0;
1189
1190err_modify_send:
1191 ib_destroy_cm_id(p->id);
1192err_id:
1193 p->id = NULL;
1194 ib_destroy_qp(p->qp);
1195err_qp:
1196 p->qp = NULL;
1197 vfree(p->tx_ring);
1198err_tx:
1199 return ret;
1200}
1201
1202static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1203{
1204 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1205 struct ipoib_tx_buf *tx_req;
1206 unsigned long begin;
1207
1208 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1209 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1210
1211 if (p->id)
1212 ib_destroy_cm_id(p->id);
1213
1214 if (p->tx_ring) {
1215 /* Wait for all sends to complete */
1216 begin = jiffies;
1217 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1218 if (time_after(jiffies, begin + 5 * HZ)) {
1219 ipoib_warn(priv, "timing out; %d sends not completed\n",
1220 p->tx_head - p->tx_tail);
1221 goto timeout;
1222 }
1223
1224 usleep_range(1000, 2000);
1225 }
1226 }
1227
1228timeout:
1229
1230 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1231 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1232 ipoib_dma_unmap_tx(priv, tx_req);
1233 dev_kfree_skb_any(tx_req->skb);
1234 netif_tx_lock_bh(p->dev);
1235 ++p->tx_tail;
1236 ++priv->tx_tail;
1237 if (unlikely(priv->tx_head - priv->tx_tail == ipoib_sendq_size >> 1) &&
1238 netif_queue_stopped(p->dev) &&
1239 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1240 netif_wake_queue(p->dev);
1241 netif_tx_unlock_bh(p->dev);
1242 }
1243
1244 if (p->qp)
1245 ib_destroy_qp(p->qp);
1246
1247 vfree(p->tx_ring);
1248 kfree(p);
1249}
1250
1251static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1252 const struct ib_cm_event *event)
1253{
1254 struct ipoib_cm_tx *tx = cm_id->context;
1255 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1256 struct net_device *dev = priv->dev;
1257 struct ipoib_neigh *neigh;
1258 unsigned long flags;
1259 int ret;
1260
1261 switch (event->event) {
1262 case IB_CM_DREQ_RECEIVED:
1263 ipoib_dbg(priv, "DREQ received.\n");
1264 ib_send_cm_drep(cm_id, NULL, 0);
1265 break;
1266 case IB_CM_REP_RECEIVED:
1267 ipoib_dbg(priv, "REP received.\n");
1268 ret = ipoib_cm_rep_handler(cm_id, event);
1269 if (ret)
1270 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1271 NULL, 0, NULL, 0);
1272 break;
1273 case IB_CM_REQ_ERROR:
1274 case IB_CM_REJ_RECEIVED:
1275 case IB_CM_TIMEWAIT_EXIT:
1276 ipoib_dbg(priv, "CM error %d.\n", event->event);
1277 netif_tx_lock_bh(dev);
1278 spin_lock_irqsave(&priv->lock, flags);
1279 neigh = tx->neigh;
1280
1281 if (neigh) {
1282 neigh->cm = NULL;
1283 ipoib_neigh_free(neigh);
1284
1285 tx->neigh = NULL;
1286 }
1287
1288 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1289 list_move(&tx->list, &priv->cm.reap_list);
1290 queue_work(priv->wq, &priv->cm.reap_task);
1291 }
1292
1293 spin_unlock_irqrestore(&priv->lock, flags);
1294 netif_tx_unlock_bh(dev);
1295 break;
1296 default:
1297 break;
1298 }
1299
1300 return 0;
1301}
1302
1303struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1304 struct ipoib_neigh *neigh)
1305{
1306 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1307 struct ipoib_cm_tx *tx;
1308
1309 tx = kzalloc(sizeof(*tx), GFP_ATOMIC);
1310 if (!tx)
1311 return NULL;
1312
1313 neigh->cm = tx;
1314 tx->neigh = neigh;
1315 tx->dev = dev;
1316 list_add(&tx->list, &priv->cm.start_list);
1317 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1318 queue_work(priv->wq, &priv->cm.start_task);
1319 return tx;
1320}
1321
1322void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1323{
1324 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1325 unsigned long flags;
1326 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1327 spin_lock_irqsave(&priv->lock, flags);
1328 list_move(&tx->list, &priv->cm.reap_list);
1329 queue_work(priv->wq, &priv->cm.reap_task);
1330 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1331 tx->neigh->daddr + 4);
1332 tx->neigh = NULL;
1333 spin_unlock_irqrestore(&priv->lock, flags);
1334 }
1335}
1336
1337#define QPN_AND_OPTIONS_OFFSET 4
1338
1339static void ipoib_cm_tx_start(struct work_struct *work)
1340{
1341 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1342 cm.start_task);
1343 struct net_device *dev = priv->dev;
1344 struct ipoib_neigh *neigh;
1345 struct ipoib_cm_tx *p;
1346 unsigned long flags;
1347 struct ipoib_path *path;
1348 int ret;
1349
1350 struct sa_path_rec pathrec;
1351 u32 qpn;
1352
1353 netif_tx_lock_bh(dev);
1354 spin_lock_irqsave(&priv->lock, flags);
1355
1356 while (!list_empty(&priv->cm.start_list)) {
1357 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1358 list_del_init(&p->list);
1359 neigh = p->neigh;
1360
1361 qpn = IPOIB_QPN(neigh->daddr);
1362 /*
1363 * As long as the search is with these 2 locks,
1364 * path existence indicates its validity.
1365 */
1366 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1367 if (!path) {
1368 pr_info("%s ignore not valid path %pI6\n",
1369 __func__,
1370 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1371 goto free_neigh;
1372 }
1373 memcpy(&pathrec, &path->pathrec, sizeof(pathrec));
1374
1375 spin_unlock_irqrestore(&priv->lock, flags);
1376 netif_tx_unlock_bh(dev);
1377
1378 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1379
1380 netif_tx_lock_bh(dev);
1381 spin_lock_irqsave(&priv->lock, flags);
1382
1383 if (ret) {
1384free_neigh:
1385 neigh = p->neigh;
1386 if (neigh) {
1387 neigh->cm = NULL;
1388 ipoib_neigh_free(neigh);
1389 }
1390 list_del(&p->list);
1391 kfree(p);
1392 }
1393 }
1394
1395 spin_unlock_irqrestore(&priv->lock, flags);
1396 netif_tx_unlock_bh(dev);
1397}
1398
1399static void ipoib_cm_tx_reap(struct work_struct *work)
1400{
1401 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1402 cm.reap_task);
1403 struct net_device *dev = priv->dev;
1404 struct ipoib_cm_tx *p;
1405 unsigned long flags;
1406
1407 netif_tx_lock_bh(dev);
1408 spin_lock_irqsave(&priv->lock, flags);
1409
1410 while (!list_empty(&priv->cm.reap_list)) {
1411 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1412 list_del_init(&p->list);
1413 spin_unlock_irqrestore(&priv->lock, flags);
1414 netif_tx_unlock_bh(dev);
1415 ipoib_cm_tx_destroy(p);
1416 netif_tx_lock_bh(dev);
1417 spin_lock_irqsave(&priv->lock, flags);
1418 }
1419
1420 spin_unlock_irqrestore(&priv->lock, flags);
1421 netif_tx_unlock_bh(dev);
1422}
1423
1424static void ipoib_cm_skb_reap(struct work_struct *work)
1425{
1426 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1427 cm.skb_task);
1428 struct net_device *dev = priv->dev;
1429 struct sk_buff *skb;
1430 unsigned long flags;
1431 unsigned int mtu = priv->mcast_mtu;
1432
1433 netif_tx_lock_bh(dev);
1434 spin_lock_irqsave(&priv->lock, flags);
1435
1436 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1437 spin_unlock_irqrestore(&priv->lock, flags);
1438 netif_tx_unlock_bh(dev);
1439
1440 if (skb->protocol == htons(ETH_P_IP)) {
1441 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
1442 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1443 }
1444#if IS_ENABLED(CONFIG_IPV6)
1445 else if (skb->protocol == htons(ETH_P_IPV6)) {
1446 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
1447 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1448 }
1449#endif
1450 dev_kfree_skb_any(skb);
1451
1452 netif_tx_lock_bh(dev);
1453 spin_lock_irqsave(&priv->lock, flags);
1454 }
1455
1456 spin_unlock_irqrestore(&priv->lock, flags);
1457 netif_tx_unlock_bh(dev);
1458}
1459
1460void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1461 unsigned int mtu)
1462{
1463 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1464 int e = skb_queue_empty(&priv->cm.skb_queue);
1465
1466 skb_dst_update_pmtu(skb, mtu);
1467
1468 skb_queue_tail(&priv->cm.skb_queue, skb);
1469 if (e)
1470 queue_work(priv->wq, &priv->cm.skb_task);
1471}
1472
1473static void ipoib_cm_rx_reap(struct work_struct *work)
1474{
1475 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1476 cm.rx_reap_task)->dev);
1477}
1478
1479static void ipoib_cm_stale_task(struct work_struct *work)
1480{
1481 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1482 cm.stale_task.work);
1483 struct ipoib_cm_rx *p;
1484 int ret;
1485
1486 spin_lock_irq(&priv->lock);
1487 while (!list_empty(&priv->cm.passive_ids)) {
1488 /* List is sorted by LRU, start from tail,
1489 * stop when we see a recently used entry */
1490 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1491 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1492 break;
1493 list_move(&p->list, &priv->cm.rx_error_list);
1494 p->state = IPOIB_CM_RX_ERROR;
1495 spin_unlock_irq(&priv->lock);
1496 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1497 if (ret)
1498 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1499 spin_lock_irq(&priv->lock);
1500 }
1501
1502 if (!list_empty(&priv->cm.passive_ids))
1503 queue_delayed_work(priv->wq,
1504 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1505 spin_unlock_irq(&priv->lock);
1506}
1507
1508static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1509 char *buf)
1510{
1511 struct net_device *dev = to_net_dev(d);
1512 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1513
1514 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1515 return sprintf(buf, "connected\n");
1516 else
1517 return sprintf(buf, "datagram\n");
1518}
1519
1520static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1521 const char *buf, size_t count)
1522{
1523 struct net_device *dev = to_net_dev(d);
1524 int ret;
1525
1526 if (!rtnl_trylock()) {
1527 return restart_syscall();
1528 }
1529
1530 if (dev->reg_state != NETREG_REGISTERED) {
1531 rtnl_unlock();
1532 return -EPERM;
1533 }
1534
1535 ret = ipoib_set_mode(dev, buf);
1536
1537 /* The assumption is that the function ipoib_set_mode returned
1538 * with the rtnl held by it, if not the value -EBUSY returned,
1539 * then no need to rtnl_unlock
1540 */
1541 if (ret != -EBUSY)
1542 rtnl_unlock();
1543
1544 return (!ret || ret == -EBUSY) ? count : ret;
1545}
1546
1547static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1548
1549int ipoib_cm_add_mode_attr(struct net_device *dev)
1550{
1551 return device_create_file(&dev->dev, &dev_attr_mode);
1552}
1553
1554static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1555{
1556 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1557 struct ib_srq_init_attr srq_init_attr = {
1558 .srq_type = IB_SRQT_BASIC,
1559 .attr = {
1560 .max_wr = ipoib_recvq_size,
1561 .max_sge = max_sge
1562 }
1563 };
1564
1565 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1566 if (IS_ERR(priv->cm.srq)) {
1567 if (PTR_ERR(priv->cm.srq) != -EOPNOTSUPP)
1568 pr_warn("%s: failed to allocate SRQ, error %ld\n",
1569 priv->ca->name, PTR_ERR(priv->cm.srq));
1570 priv->cm.srq = NULL;
1571 return;
1572 }
1573
1574 priv->cm.srq_ring = vzalloc(array_size(ipoib_recvq_size,
1575 sizeof(*priv->cm.srq_ring)));
1576 if (!priv->cm.srq_ring) {
1577 ib_destroy_srq(priv->cm.srq);
1578 priv->cm.srq = NULL;
1579 return;
1580 }
1581
1582}
1583
1584int ipoib_cm_dev_init(struct net_device *dev)
1585{
1586 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1587 int max_srq_sge, i;
1588
1589 INIT_LIST_HEAD(&priv->cm.passive_ids);
1590 INIT_LIST_HEAD(&priv->cm.reap_list);
1591 INIT_LIST_HEAD(&priv->cm.start_list);
1592 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1593 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1594 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1595 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1596 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1597 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1598 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1599 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1600 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1601
1602 skb_queue_head_init(&priv->cm.skb_queue);
1603
1604 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1605
1606 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1607 ipoib_cm_create_srq(dev, max_srq_sge);
1608 if (ipoib_cm_has_srq(dev)) {
1609 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1610 priv->cm.num_frags = max_srq_sge;
1611 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1612 priv->cm.max_cm_mtu, priv->cm.num_frags);
1613 } else {
1614 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1615 priv->cm.num_frags = IPOIB_CM_RX_SG;
1616 }
1617
1618 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1619
1620 if (ipoib_cm_has_srq(dev)) {
1621 for (i = 0; i < ipoib_recvq_size; ++i) {
1622 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1623 priv->cm.num_frags - 1,
1624 priv->cm.srq_ring[i].mapping,
1625 GFP_KERNEL)) {
1626 ipoib_warn(priv, "failed to allocate "
1627 "receive buffer %d\n", i);
1628 ipoib_cm_dev_cleanup(dev);
1629 return -ENOMEM;
1630 }
1631
1632 if (ipoib_cm_post_receive_srq(dev, i)) {
1633 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1634 "failed for buf %d\n", i);
1635 ipoib_cm_dev_cleanup(dev);
1636 return -EIO;
1637 }
1638 }
1639 }
1640
1641 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1642 return 0;
1643}
1644
1645void ipoib_cm_dev_cleanup(struct net_device *dev)
1646{
1647 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1648 int ret;
1649
1650 if (!priv->cm.srq)
1651 return;
1652
1653 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1654
1655 ret = ib_destroy_srq(priv->cm.srq);
1656 if (ret)
1657 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1658
1659 priv->cm.srq = NULL;
1660 if (!priv->cm.srq_ring)
1661 return;
1662
1663 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1664 priv->cm.srq_ring = NULL;
1665}
1666