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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
44int ipoib_max_conn_qp = 128;
45
46module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
47MODULE_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
52static int data_debug_level;
53
54module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
55MODULE_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
66static struct ib_qp_attr ipoib_cm_err_attr = {
67 .qp_state = IB_QPS_ERR
68};
69
70#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
71
72static struct ib_send_wr ipoib_cm_rx_drain_wr = {
73 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
74 .opcode = IB_WR_SEND,
75};
76
77static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
78 struct ib_cm_event *event);
79
80static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
81 u64 mapping[IPOIB_CM_RX_SG])
82{
83 int i;
84
85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
86
87 for (i = 0; i < frags; ++i)
88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
89}
90
91static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
92{
93 struct ipoib_dev_priv *priv = netdev_priv(dev);
94 struct ib_recv_wr *bad_wr;
95 int i, ret;
96
97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
98
99 for (i = 0; i < priv->cm.num_frags; ++i)
100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
101
102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
103 if (unlikely(ret)) {
104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
106 priv->cm.srq_ring[id].mapping);
107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
108 priv->cm.srq_ring[id].skb = NULL;
109 }
110
111 return ret;
112}
113
114static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
115 struct ipoib_cm_rx *rx,
116 struct ib_recv_wr *wr,
117 struct ib_sge *sge, int id)
118{
119 struct ipoib_dev_priv *priv = netdev_priv(dev);
120 struct ib_recv_wr *bad_wr;
121 int i, ret;
122
123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
124
125 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
126 sge[i].addr = rx->rx_ring[id].mapping[i];
127
128 ret = ib_post_recv(rx->qp, wr, &bad_wr);
129 if (unlikely(ret)) {
130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
132 rx->rx_ring[id].mapping);
133 dev_kfree_skb_any(rx->rx_ring[id].skb);
134 rx->rx_ring[id].skb = NULL;
135 }
136
137 return ret;
138}
139
140static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
141 struct ipoib_cm_rx_buf *rx_ring,
142 int id, int frags,
143 u64 mapping[IPOIB_CM_RX_SG],
144 gfp_t gfp)
145{
146 struct ipoib_dev_priv *priv = netdev_priv(dev);
147 struct sk_buff *skb;
148 int i;
149
150 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
151 if (unlikely(!skb))
152 return NULL;
153
154
155
156
157
158 skb_reserve(skb, 12);
159
160 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
161 DMA_FROM_DEVICE);
162 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
163 dev_kfree_skb_any(skb);
164 return NULL;
165 }
166
167 for (i = 0; i < frags; i++) {
168 struct page *page = alloc_page(gfp);
169
170 if (!page)
171 goto partial_error;
172 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
173
174 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
175 0, PAGE_SIZE, DMA_FROM_DEVICE);
176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
177 goto partial_error;
178 }
179
180 rx_ring[id].skb = skb;
181 return skb;
182
183partial_error:
184
185 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
186
187 for (; i > 0; --i)
188 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
189
190 dev_kfree_skb_any(skb);
191 return NULL;
192}
193
194static void ipoib_cm_free_rx_ring(struct net_device *dev,
195 struct ipoib_cm_rx_buf *rx_ring)
196{
197 struct ipoib_dev_priv *priv = netdev_priv(dev);
198 int i;
199
200 for (i = 0; i < ipoib_recvq_size; ++i)
201 if (rx_ring[i].skb) {
202 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
203 rx_ring[i].mapping);
204 dev_kfree_skb_any(rx_ring[i].skb);
205 }
206
207 vfree(rx_ring);
208}
209
210static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
211{
212 struct ib_send_wr *bad_wr;
213 struct ipoib_cm_rx *p;
214
215
216
217 if (list_empty(&priv->cm.rx_flush_list) ||
218 !list_empty(&priv->cm.rx_drain_list))
219 return;
220
221
222
223
224
225 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
226 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
227 ipoib_warn(priv, "failed to post drain wr\n");
228
229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
230}
231
232static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
233{
234 struct ipoib_cm_rx *p = ctx;
235 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
236 unsigned long flags;
237
238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
239 return;
240
241 spin_lock_irqsave(&priv->lock, flags);
242 list_move(&p->list, &priv->cm.rx_flush_list);
243 p->state = IPOIB_CM_RX_FLUSH;
244 ipoib_cm_start_rx_drain(priv);
245 spin_unlock_irqrestore(&priv->lock, flags);
246}
247
248static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
249 struct ipoib_cm_rx *p)
250{
251 struct ipoib_dev_priv *priv = netdev_priv(dev);
252 struct ib_qp_init_attr attr = {
253 .event_handler = ipoib_cm_rx_event_handler,
254 .send_cq = priv->recv_cq,
255 .recv_cq = priv->recv_cq,
256 .srq = priv->cm.srq,
257 .cap.max_send_wr = 1,
258 .cap.max_send_sge = 1,
259 .sq_sig_type = IB_SIGNAL_ALL_WR,
260 .qp_type = IB_QPT_RC,
261 .qp_context = p,
262 };
263
264 if (!ipoib_cm_has_srq(dev)) {
265 attr.cap.max_recv_wr = ipoib_recvq_size;
266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
267 }
268
269 return ib_create_qp(priv->pd, &attr);
270}
271
272static int ipoib_cm_modify_rx_qp(struct net_device *dev,
273 struct ib_cm_id *cm_id, struct ib_qp *qp,
274 unsigned psn)
275{
276 struct ipoib_dev_priv *priv = netdev_priv(dev);
277 struct ib_qp_attr qp_attr;
278 int qp_attr_mask, ret;
279
280 qp_attr.qp_state = IB_QPS_INIT;
281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
282 if (ret) {
283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
284 return ret;
285 }
286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
287 if (ret) {
288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
289 return ret;
290 }
291 qp_attr.qp_state = IB_QPS_RTR;
292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
293 if (ret) {
294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
295 return ret;
296 }
297 qp_attr.rq_psn = psn;
298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
299 if (ret) {
300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
301 return ret;
302 }
303
304
305
306
307
308
309
310
311
312 qp_attr.qp_state = IB_QPS_RTS;
313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
314 if (ret) {
315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
316 return 0;
317 }
318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
319 if (ret) {
320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
321 return 0;
322 }
323
324 return 0;
325}
326
327static void ipoib_cm_init_rx_wr(struct net_device *dev,
328 struct ib_recv_wr *wr,
329 struct ib_sge *sge)
330{
331 struct ipoib_dev_priv *priv = netdev_priv(dev);
332 int i;
333
334 for (i = 0; i < priv->cm.num_frags; ++i)
335 sge[i].lkey = priv->mr->lkey;
336
337 sge[0].length = IPOIB_CM_HEAD_SIZE;
338 for (i = 1; i < priv->cm.num_frags; ++i)
339 sge[i].length = PAGE_SIZE;
340
341 wr->next = NULL;
342 wr->sg_list = sge;
343 wr->num_sge = priv->cm.num_frags;
344}
345
346static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
347 struct ipoib_cm_rx *rx)
348{
349 struct ipoib_dev_priv *priv = netdev_priv(dev);
350 struct {
351 struct ib_recv_wr wr;
352 struct ib_sge sge[IPOIB_CM_RX_SG];
353 } *t;
354 int ret;
355 int i;
356
357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
358 if (!rx->rx_ring) {
359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
360 priv->ca->name, ipoib_recvq_size);
361 return -ENOMEM;
362 }
363
364 t = kmalloc(sizeof *t, GFP_KERNEL);
365 if (!t) {
366 ret = -ENOMEM;
367 goto err_free;
368 }
369
370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
371
372 spin_lock_irq(&priv->lock);
373
374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
375 spin_unlock_irq(&priv->lock);
376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
377 ret = -EINVAL;
378 goto err_free;
379 } else
380 ++priv->cm.nonsrq_conn_qp;
381
382 spin_unlock_irq(&priv->lock);
383
384 for (i = 0; i < ipoib_recvq_size; ++i) {
385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
386 rx->rx_ring[i].mapping,
387 GFP_KERNEL)) {
388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
389 ret = -ENOMEM;
390 goto err_count;
391 }
392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
393 if (ret) {
394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
395 "failed for buf %d\n", i);
396 ret = -EIO;
397 goto err_count;
398 }
399 }
400
401 rx->recv_count = ipoib_recvq_size;
402
403 kfree(t);
404
405 return 0;
406
407err_count:
408 spin_lock_irq(&priv->lock);
409 --priv->cm.nonsrq_conn_qp;
410 spin_unlock_irq(&priv->lock);
411
412err_free:
413 kfree(t);
414 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
415
416 return ret;
417}
418
419static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
420 struct ib_qp *qp, struct ib_cm_req_event_param *req,
421 unsigned psn)
422{
423 struct ipoib_dev_priv *priv = netdev_priv(dev);
424 struct ipoib_cm_data data = {};
425 struct ib_cm_rep_param rep = {};
426
427 data.qpn = cpu_to_be32(priv->qp->qp_num);
428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
429
430 rep.private_data = &data;
431 rep.private_data_len = sizeof data;
432 rep.flow_control = 0;
433 rep.rnr_retry_count = req->rnr_retry_count;
434 rep.srq = ipoib_cm_has_srq(dev);
435 rep.qp_num = qp->qp_num;
436 rep.starting_psn = psn;
437 return ib_send_cm_rep(cm_id, &rep);
438}
439
440static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
441{
442 struct net_device *dev = cm_id->context;
443 struct ipoib_dev_priv *priv = netdev_priv(dev);
444 struct ipoib_cm_rx *p;
445 unsigned psn;
446 int ret;
447
448 ipoib_dbg(priv, "REQ arrived\n");
449 p = kzalloc(sizeof *p, GFP_KERNEL);
450 if (!p)
451 return -ENOMEM;
452 p->dev = dev;
453 p->id = cm_id;
454 cm_id->context = p;
455 p->state = IPOIB_CM_RX_LIVE;
456 p->jiffies = jiffies;
457 INIT_LIST_HEAD(&p->list);
458
459 p->qp = ipoib_cm_create_rx_qp(dev, p);
460 if (IS_ERR(p->qp)) {
461 ret = PTR_ERR(p->qp);
462 goto err_qp;
463 }
464
465 psn = prandom_u32() & 0xffffff;
466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
467 if (ret)
468 goto err_modify;
469
470 if (!ipoib_cm_has_srq(dev)) {
471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
472 if (ret)
473 goto err_modify;
474 }
475
476 spin_lock_irq(&priv->lock);
477 queue_delayed_work(ipoib_workqueue,
478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
479
480
481 p->jiffies = jiffies;
482 if (p->state == IPOIB_CM_RX_LIVE)
483 list_move(&p->list, &priv->cm.passive_ids);
484 spin_unlock_irq(&priv->lock);
485
486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
487 if (ret) {
488 ipoib_warn(priv, "failed to send REP: %d\n", ret);
489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
490 ipoib_warn(priv, "unable to move qp to error state\n");
491 }
492 return 0;
493
494err_modify:
495 ib_destroy_qp(p->qp);
496err_qp:
497 kfree(p);
498 return ret;
499}
500
501static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
502 struct ib_cm_event *event)
503{
504 struct ipoib_cm_rx *p;
505 struct ipoib_dev_priv *priv;
506
507 switch (event->event) {
508 case IB_CM_REQ_RECEIVED:
509 return ipoib_cm_req_handler(cm_id, event);
510 case IB_CM_DREQ_RECEIVED:
511 p = cm_id->context;
512 ib_send_cm_drep(cm_id, NULL, 0);
513
514 case IB_CM_REJ_RECEIVED:
515 p = cm_id->context;
516 priv = netdev_priv(p->dev);
517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
518 ipoib_warn(priv, "unable to move qp to error state\n");
519
520 default:
521 return 0;
522 }
523}
524
525static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
526 unsigned int length, struct sk_buff *toskb)
527{
528 int i, num_frags;
529 unsigned int size;
530
531
532 size = min(length, hdr_space);
533 skb->tail += size;
534 skb->len += size;
535 length -= size;
536
537 num_frags = skb_shinfo(skb)->nr_frags;
538 for (i = 0; i < num_frags; i++) {
539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
540
541 if (length == 0) {
542
543 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
544 0, PAGE_SIZE);
545 --skb_shinfo(skb)->nr_frags;
546 } else {
547 size = min(length, (unsigned) PAGE_SIZE);
548
549 skb_frag_size_set(frag, size);
550 skb->data_len += size;
551 skb->truesize += size;
552 skb->len += size;
553 length -= size;
554 }
555 }
556}
557
558void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
559{
560 struct ipoib_dev_priv *priv = netdev_priv(dev);
561 struct ipoib_cm_rx_buf *rx_ring;
562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
563 struct sk_buff *skb, *newskb;
564 struct ipoib_cm_rx *p;
565 unsigned long flags;
566 u64 mapping[IPOIB_CM_RX_SG];
567 int frags;
568 int has_srq;
569 struct sk_buff *small_skb;
570
571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
572 wr_id, wc->status);
573
574 if (unlikely(wr_id >= ipoib_recvq_size)) {
575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
576 spin_lock_irqsave(&priv->lock, flags);
577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
578 ipoib_cm_start_rx_drain(priv);
579 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
580 spin_unlock_irqrestore(&priv->lock, flags);
581 } else
582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
583 wr_id, ipoib_recvq_size);
584 return;
585 }
586
587 p = wc->qp->qp_context;
588
589 has_srq = ipoib_cm_has_srq(dev);
590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
591
592 skb = rx_ring[wr_id].skb;
593
594 if (unlikely(wc->status != IB_WC_SUCCESS)) {
595 ipoib_dbg(priv, "cm recv error "
596 "(status=%d, wrid=%d vend_err %x)\n",
597 wc->status, wr_id, wc->vendor_err);
598 ++dev->stats.rx_dropped;
599 if (has_srq)
600 goto repost;
601 else {
602 if (!--p->recv_count) {
603 spin_lock_irqsave(&priv->lock, flags);
604 list_move(&p->list, &priv->cm.rx_reap_list);
605 spin_unlock_irqrestore(&priv->lock, flags);
606 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
607 }
608 return;
609 }
610 }
611
612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
614 spin_lock_irqsave(&priv->lock, flags);
615 p->jiffies = jiffies;
616
617
618 if (p->state == IPOIB_CM_RX_LIVE)
619 list_move(&p->list, &priv->cm.passive_ids);
620 spin_unlock_irqrestore(&priv->lock, flags);
621 }
622 }
623
624 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
625 int dlen = wc->byte_len;
626
627 small_skb = dev_alloc_skb(dlen + 12);
628 if (small_skb) {
629 skb_reserve(small_skb, 12);
630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
631 dlen, DMA_FROM_DEVICE);
632 skb_copy_from_linear_data(skb, small_skb->data, dlen);
633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
634 dlen, DMA_FROM_DEVICE);
635 skb_put(small_skb, dlen);
636 skb = small_skb;
637 goto copied;
638 }
639 }
640
641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
643
644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
645 mapping, GFP_ATOMIC);
646 if (unlikely(!newskb)) {
647
648
649
650
651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
652 ++dev->stats.rx_dropped;
653 goto repost;
654 }
655
656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
658
659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
660 wc->byte_len, wc->slid);
661
662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
663
664copied:
665 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
666 skb_reset_mac_header(skb);
667 skb_pull(skb, IPOIB_ENCAP_LEN);
668
669 ++dev->stats.rx_packets;
670 dev->stats.rx_bytes += skb->len;
671
672 skb->dev = dev;
673
674 skb->pkt_type = PACKET_HOST;
675 netif_receive_skb(skb);
676
677repost:
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
694static inline int post_send(struct ipoib_dev_priv *priv,
695 struct ipoib_cm_tx *tx,
696 unsigned int wr_id,
697 u64 addr, int len)
698{
699 struct ib_send_wr *bad_wr;
700
701 priv->tx_sge[0].addr = addr;
702 priv->tx_sge[0].length = len;
703
704 priv->tx_wr.num_sge = 1;
705 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
706
707 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
708}
709
710void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
711{
712 struct ipoib_dev_priv *priv = netdev_priv(dev);
713 struct ipoib_cm_tx_buf *tx_req;
714 u64 addr;
715 int rc;
716
717 if (unlikely(skb->len > tx->mtu)) {
718 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
719 skb->len, tx->mtu);
720 ++dev->stats.tx_dropped;
721 ++dev->stats.tx_errors;
722 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
723 return;
724 }
725
726 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
727 tx->tx_head, skb->len, tx->qp->qp_num);
728
729
730
731
732
733
734
735
736 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
737 tx_req->skb = skb;
738 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
739 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
740 ++dev->stats.tx_errors;
741 dev_kfree_skb_any(skb);
742 return;
743 }
744
745 tx_req->mapping = addr;
746
747 skb_orphan(skb);
748 skb_dst_drop(skb);
749
750 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
751 addr, skb->len);
752 if (unlikely(rc)) {
753 ipoib_warn(priv, "post_send failed, error %d\n", rc);
754 ++dev->stats.tx_errors;
755 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
756 dev_kfree_skb_any(skb);
757 } else {
758 dev->trans_start = jiffies;
759 ++tx->tx_head;
760
761 if (++priv->tx_outstanding == ipoib_sendq_size) {
762 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
763 tx->qp->qp_num);
764 netif_stop_queue(dev);
765 rc = ib_req_notify_cq(priv->send_cq,
766 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
767 if (rc < 0)
768 ipoib_warn(priv, "request notify on send CQ failed\n");
769 else if (rc)
770 ipoib_send_comp_handler(priv->send_cq, dev);
771 }
772 }
773}
774
775void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
776{
777 struct ipoib_dev_priv *priv = netdev_priv(dev);
778 struct ipoib_cm_tx *tx = wc->qp->qp_context;
779 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
780 struct ipoib_cm_tx_buf *tx_req;
781 unsigned long flags;
782
783 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
784 wr_id, wc->status);
785
786 if (unlikely(wr_id >= ipoib_sendq_size)) {
787 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
788 wr_id, ipoib_sendq_size);
789 return;
790 }
791
792 tx_req = &tx->tx_ring[wr_id];
793
794 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
795
796
797 ++dev->stats.tx_packets;
798 dev->stats.tx_bytes += tx_req->skb->len;
799
800 dev_kfree_skb_any(tx_req->skb);
801
802 netif_tx_lock(dev);
803
804 ++tx->tx_tail;
805 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
806 netif_queue_stopped(dev) &&
807 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
808 netif_wake_queue(dev);
809
810 if (wc->status != IB_WC_SUCCESS &&
811 wc->status != IB_WC_WR_FLUSH_ERR) {
812 struct ipoib_neigh *neigh;
813
814 ipoib_dbg(priv, "failed cm send event "
815 "(status=%d, wrid=%d vend_err %x)\n",
816 wc->status, wr_id, wc->vendor_err);
817
818 spin_lock_irqsave(&priv->lock, flags);
819 neigh = tx->neigh;
820
821 if (neigh) {
822 neigh->cm = NULL;
823 ipoib_neigh_free(neigh);
824
825 tx->neigh = NULL;
826 }
827
828 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
829 list_move(&tx->list, &priv->cm.reap_list);
830 queue_work(ipoib_workqueue, &priv->cm.reap_task);
831 }
832
833 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
834
835 spin_unlock_irqrestore(&priv->lock, flags);
836 }
837
838 netif_tx_unlock(dev);
839}
840
841int ipoib_cm_dev_open(struct net_device *dev)
842{
843 struct ipoib_dev_priv *priv = netdev_priv(dev);
844 int ret;
845
846 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
847 return 0;
848
849 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
850 if (IS_ERR(priv->cm.id)) {
851 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
852 ret = PTR_ERR(priv->cm.id);
853 goto err_cm;
854 }
855
856 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
857 0, NULL);
858 if (ret) {
859 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
860 IPOIB_CM_IETF_ID | priv->qp->qp_num);
861 goto err_listen;
862 }
863
864 return 0;
865
866err_listen:
867 ib_destroy_cm_id(priv->cm.id);
868err_cm:
869 priv->cm.id = NULL;
870 return ret;
871}
872
873static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
874{
875 struct ipoib_dev_priv *priv = netdev_priv(dev);
876 struct ipoib_cm_rx *rx, *n;
877 LIST_HEAD(list);
878
879 spin_lock_irq(&priv->lock);
880 list_splice_init(&priv->cm.rx_reap_list, &list);
881 spin_unlock_irq(&priv->lock);
882
883 list_for_each_entry_safe(rx, n, &list, list) {
884 ib_destroy_cm_id(rx->id);
885 ib_destroy_qp(rx->qp);
886 if (!ipoib_cm_has_srq(dev)) {
887 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
888 spin_lock_irq(&priv->lock);
889 --priv->cm.nonsrq_conn_qp;
890 spin_unlock_irq(&priv->lock);
891 }
892 kfree(rx);
893 }
894}
895
896void ipoib_cm_dev_stop(struct net_device *dev)
897{
898 struct ipoib_dev_priv *priv = netdev_priv(dev);
899 struct ipoib_cm_rx *p;
900 unsigned long begin;
901 int ret;
902
903 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
904 return;
905
906 ib_destroy_cm_id(priv->cm.id);
907 priv->cm.id = NULL;
908
909 spin_lock_irq(&priv->lock);
910 while (!list_empty(&priv->cm.passive_ids)) {
911 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
912 list_move(&p->list, &priv->cm.rx_error_list);
913 p->state = IPOIB_CM_RX_ERROR;
914 spin_unlock_irq(&priv->lock);
915 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
916 if (ret)
917 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
918 spin_lock_irq(&priv->lock);
919 }
920
921
922 begin = jiffies;
923
924 while (!list_empty(&priv->cm.rx_error_list) ||
925 !list_empty(&priv->cm.rx_flush_list) ||
926 !list_empty(&priv->cm.rx_drain_list)) {
927 if (time_after(jiffies, begin + 5 * HZ)) {
928 ipoib_warn(priv, "RX drain timing out\n");
929
930
931
932
933 list_splice_init(&priv->cm.rx_flush_list,
934 &priv->cm.rx_reap_list);
935 list_splice_init(&priv->cm.rx_error_list,
936 &priv->cm.rx_reap_list);
937 list_splice_init(&priv->cm.rx_drain_list,
938 &priv->cm.rx_reap_list);
939 break;
940 }
941 spin_unlock_irq(&priv->lock);
942 msleep(1);
943 ipoib_drain_cq(dev);
944 spin_lock_irq(&priv->lock);
945 }
946
947 spin_unlock_irq(&priv->lock);
948
949 ipoib_cm_free_rx_reap_list(dev);
950
951 cancel_delayed_work(&priv->cm.stale_task);
952}
953
954static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
955{
956 struct ipoib_cm_tx *p = cm_id->context;
957 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
958 struct ipoib_cm_data *data = event->private_data;
959 struct sk_buff_head skqueue;
960 struct ib_qp_attr qp_attr;
961 int qp_attr_mask, ret;
962 struct sk_buff *skb;
963
964 p->mtu = be32_to_cpu(data->mtu);
965
966 if (p->mtu <= IPOIB_ENCAP_LEN) {
967 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
968 p->mtu, IPOIB_ENCAP_LEN);
969 return -EINVAL;
970 }
971
972 qp_attr.qp_state = IB_QPS_RTR;
973 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
974 if (ret) {
975 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
976 return ret;
977 }
978
979 qp_attr.rq_psn = 0 ;
980 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
981 if (ret) {
982 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
983 return ret;
984 }
985
986 qp_attr.qp_state = IB_QPS_RTS;
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 RTS: %d\n", ret);
990 return ret;
991 }
992 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
993 if (ret) {
994 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
995 return ret;
996 }
997
998 skb_queue_head_init(&skqueue);
999
1000 spin_lock_irq(&priv->lock);
1001 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1002 if (p->neigh)
1003 while ((skb = __skb_dequeue(&p->neigh->queue)))
1004 __skb_queue_tail(&skqueue, skb);
1005 spin_unlock_irq(&priv->lock);
1006
1007 while ((skb = __skb_dequeue(&skqueue))) {
1008 skb->dev = p->dev;
1009 if (dev_queue_xmit(skb))
1010 ipoib_warn(priv, "dev_queue_xmit failed "
1011 "to requeue packet\n");
1012 }
1013
1014 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1015 if (ret) {
1016 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1017 return ret;
1018 }
1019 return 0;
1020}
1021
1022static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1023{
1024 struct ipoib_dev_priv *priv = netdev_priv(dev);
1025 struct ib_qp_init_attr attr = {
1026 .send_cq = priv->recv_cq,
1027 .recv_cq = priv->recv_cq,
1028 .srq = priv->cm.srq,
1029 .cap.max_send_wr = ipoib_sendq_size,
1030 .cap.max_send_sge = 1,
1031 .sq_sig_type = IB_SIGNAL_ALL_WR,
1032 .qp_type = IB_QPT_RC,
1033 .qp_context = tx,
1034 .create_flags = IB_QP_CREATE_USE_GFP_NOIO
1035 };
1036
1037 struct ib_qp *tx_qp;
1038
1039 tx_qp = ib_create_qp(priv->pd, &attr);
1040 if (PTR_ERR(tx_qp) == -EINVAL) {
1041 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n",
1042 priv->ca->name);
1043 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1044 tx_qp = ib_create_qp(priv->pd, &attr);
1045 }
1046 return tx_qp;
1047}
1048
1049static int ipoib_cm_send_req(struct net_device *dev,
1050 struct ib_cm_id *id, struct ib_qp *qp,
1051 u32 qpn,
1052 struct ib_sa_path_rec *pathrec)
1053{
1054 struct ipoib_dev_priv *priv = netdev_priv(dev);
1055 struct ipoib_cm_data data = {};
1056 struct ib_cm_req_param req = {};
1057
1058 data.qpn = cpu_to_be32(priv->qp->qp_num);
1059 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1060
1061 req.primary_path = pathrec;
1062 req.alternate_path = NULL;
1063 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1064 req.qp_num = qp->qp_num;
1065 req.qp_type = qp->qp_type;
1066 req.private_data = &data;
1067 req.private_data_len = sizeof data;
1068 req.flow_control = 0;
1069
1070 req.starting_psn = 0;
1071
1072
1073
1074
1075
1076 req.responder_resources = 4;
1077 req.remote_cm_response_timeout = 20;
1078 req.local_cm_response_timeout = 20;
1079 req.retry_count = 0;
1080 req.rnr_retry_count = 0;
1081 req.max_cm_retries = 15;
1082 req.srq = ipoib_cm_has_srq(dev);
1083 return ib_send_cm_req(id, &req);
1084}
1085
1086static int ipoib_cm_modify_tx_init(struct net_device *dev,
1087 struct ib_cm_id *cm_id, struct ib_qp *qp)
1088{
1089 struct ipoib_dev_priv *priv = netdev_priv(dev);
1090 struct ib_qp_attr qp_attr;
1091 int qp_attr_mask, ret;
1092 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1093 if (ret) {
1094 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1095 return ret;
1096 }
1097
1098 qp_attr.qp_state = IB_QPS_INIT;
1099 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1100 qp_attr.port_num = priv->port;
1101 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1102
1103 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1104 if (ret) {
1105 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1106 return ret;
1107 }
1108 return 0;
1109}
1110
1111static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1112 struct ib_sa_path_rec *pathrec)
1113{
1114 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1115 int ret;
1116
1117 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1118 GFP_NOIO, PAGE_KERNEL);
1119 if (!p->tx_ring) {
1120 ipoib_warn(priv, "failed to allocate tx ring\n");
1121 ret = -ENOMEM;
1122 goto err_tx;
1123 }
1124 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1125
1126 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1127 if (IS_ERR(p->qp)) {
1128 ret = PTR_ERR(p->qp);
1129 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1130 goto err_qp;
1131 }
1132
1133 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1134 if (IS_ERR(p->id)) {
1135 ret = PTR_ERR(p->id);
1136 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1137 goto err_id;
1138 }
1139
1140 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1141 if (ret) {
1142 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1143 goto err_modify;
1144 }
1145
1146 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1147 if (ret) {
1148 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1149 goto err_send_cm;
1150 }
1151
1152 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1153 p->qp->qp_num, pathrec->dgid.raw, qpn);
1154
1155 return 0;
1156
1157err_send_cm:
1158err_modify:
1159 ib_destroy_cm_id(p->id);
1160err_id:
1161 p->id = NULL;
1162 ib_destroy_qp(p->qp);
1163err_qp:
1164 p->qp = NULL;
1165 vfree(p->tx_ring);
1166err_tx:
1167 return ret;
1168}
1169
1170static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1171{
1172 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1173 struct ipoib_cm_tx_buf *tx_req;
1174 unsigned long begin;
1175
1176 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1177 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1178
1179 if (p->id)
1180 ib_destroy_cm_id(p->id);
1181
1182 if (p->tx_ring) {
1183
1184 begin = jiffies;
1185 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1186 if (time_after(jiffies, begin + 5 * HZ)) {
1187 ipoib_warn(priv, "timing out; %d sends not completed\n",
1188 p->tx_head - p->tx_tail);
1189 goto timeout;
1190 }
1191
1192 msleep(1);
1193 }
1194 }
1195
1196timeout:
1197
1198 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1199 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1200 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1201 DMA_TO_DEVICE);
1202 dev_kfree_skb_any(tx_req->skb);
1203 ++p->tx_tail;
1204 netif_tx_lock_bh(p->dev);
1205 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1206 netif_queue_stopped(p->dev) &&
1207 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1208 netif_wake_queue(p->dev);
1209 netif_tx_unlock_bh(p->dev);
1210 }
1211
1212 if (p->qp)
1213 ib_destroy_qp(p->qp);
1214
1215 vfree(p->tx_ring);
1216 kfree(p);
1217}
1218
1219static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1220 struct ib_cm_event *event)
1221{
1222 struct ipoib_cm_tx *tx = cm_id->context;
1223 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1224 struct net_device *dev = priv->dev;
1225 struct ipoib_neigh *neigh;
1226 unsigned long flags;
1227 int ret;
1228
1229 switch (event->event) {
1230 case IB_CM_DREQ_RECEIVED:
1231 ipoib_dbg(priv, "DREQ received.\n");
1232 ib_send_cm_drep(cm_id, NULL, 0);
1233 break;
1234 case IB_CM_REP_RECEIVED:
1235 ipoib_dbg(priv, "REP received.\n");
1236 ret = ipoib_cm_rep_handler(cm_id, event);
1237 if (ret)
1238 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1239 NULL, 0, NULL, 0);
1240 break;
1241 case IB_CM_REQ_ERROR:
1242 case IB_CM_REJ_RECEIVED:
1243 case IB_CM_TIMEWAIT_EXIT:
1244 ipoib_dbg(priv, "CM error %d.\n", event->event);
1245 netif_tx_lock_bh(dev);
1246 spin_lock_irqsave(&priv->lock, flags);
1247 neigh = tx->neigh;
1248
1249 if (neigh) {
1250 neigh->cm = NULL;
1251 ipoib_neigh_free(neigh);
1252
1253 tx->neigh = NULL;
1254 }
1255
1256 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1257 list_move(&tx->list, &priv->cm.reap_list);
1258 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1259 }
1260
1261 spin_unlock_irqrestore(&priv->lock, flags);
1262 netif_tx_unlock_bh(dev);
1263 break;
1264 default:
1265 break;
1266 }
1267
1268 return 0;
1269}
1270
1271struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1272 struct ipoib_neigh *neigh)
1273{
1274 struct ipoib_dev_priv *priv = netdev_priv(dev);
1275 struct ipoib_cm_tx *tx;
1276
1277 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1278 if (!tx)
1279 return NULL;
1280
1281 neigh->cm = tx;
1282 tx->neigh = neigh;
1283 tx->path = path;
1284 tx->dev = dev;
1285 list_add(&tx->list, &priv->cm.start_list);
1286 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1287 queue_work(ipoib_workqueue, &priv->cm.start_task);
1288 return tx;
1289}
1290
1291void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1292{
1293 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1294 unsigned long flags;
1295 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1296 spin_lock_irqsave(&priv->lock, flags);
1297 list_move(&tx->list, &priv->cm.reap_list);
1298 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1299 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1300 tx->neigh->daddr + 4);
1301 tx->neigh = NULL;
1302 spin_unlock_irqrestore(&priv->lock, flags);
1303 }
1304}
1305
1306static void ipoib_cm_tx_start(struct work_struct *work)
1307{
1308 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1309 cm.start_task);
1310 struct net_device *dev = priv->dev;
1311 struct ipoib_neigh *neigh;
1312 struct ipoib_cm_tx *p;
1313 unsigned long flags;
1314 int ret;
1315
1316 struct ib_sa_path_rec pathrec;
1317 u32 qpn;
1318
1319 netif_tx_lock_bh(dev);
1320 spin_lock_irqsave(&priv->lock, flags);
1321
1322 while (!list_empty(&priv->cm.start_list)) {
1323 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1324 list_del_init(&p->list);
1325 neigh = p->neigh;
1326 qpn = IPOIB_QPN(neigh->daddr);
1327 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1328
1329 spin_unlock_irqrestore(&priv->lock, flags);
1330 netif_tx_unlock_bh(dev);
1331
1332 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1333
1334 netif_tx_lock_bh(dev);
1335 spin_lock_irqsave(&priv->lock, flags);
1336
1337 if (ret) {
1338 neigh = p->neigh;
1339 if (neigh) {
1340 neigh->cm = NULL;
1341 ipoib_neigh_free(neigh);
1342 }
1343 list_del(&p->list);
1344 kfree(p);
1345 }
1346 }
1347
1348 spin_unlock_irqrestore(&priv->lock, flags);
1349 netif_tx_unlock_bh(dev);
1350}
1351
1352static void ipoib_cm_tx_reap(struct work_struct *work)
1353{
1354 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1355 cm.reap_task);
1356 struct net_device *dev = priv->dev;
1357 struct ipoib_cm_tx *p;
1358 unsigned long flags;
1359
1360 netif_tx_lock_bh(dev);
1361 spin_lock_irqsave(&priv->lock, flags);
1362
1363 while (!list_empty(&priv->cm.reap_list)) {
1364 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1365 list_del(&p->list);
1366 spin_unlock_irqrestore(&priv->lock, flags);
1367 netif_tx_unlock_bh(dev);
1368 ipoib_cm_tx_destroy(p);
1369 netif_tx_lock_bh(dev);
1370 spin_lock_irqsave(&priv->lock, flags);
1371 }
1372
1373 spin_unlock_irqrestore(&priv->lock, flags);
1374 netif_tx_unlock_bh(dev);
1375}
1376
1377static void ipoib_cm_skb_reap(struct work_struct *work)
1378{
1379 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1380 cm.skb_task);
1381 struct net_device *dev = priv->dev;
1382 struct sk_buff *skb;
1383 unsigned long flags;
1384 unsigned mtu = priv->mcast_mtu;
1385
1386 netif_tx_lock_bh(dev);
1387 spin_lock_irqsave(&priv->lock, flags);
1388
1389 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1390 spin_unlock_irqrestore(&priv->lock, flags);
1391 netif_tx_unlock_bh(dev);
1392
1393 if (skb->protocol == htons(ETH_P_IP))
1394 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1395#if IS_ENABLED(CONFIG_IPV6)
1396 else if (skb->protocol == htons(ETH_P_IPV6))
1397 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1398#endif
1399 dev_kfree_skb_any(skb);
1400
1401 netif_tx_lock_bh(dev);
1402 spin_lock_irqsave(&priv->lock, flags);
1403 }
1404
1405 spin_unlock_irqrestore(&priv->lock, flags);
1406 netif_tx_unlock_bh(dev);
1407}
1408
1409void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1410 unsigned int mtu)
1411{
1412 struct ipoib_dev_priv *priv = netdev_priv(dev);
1413 int e = skb_queue_empty(&priv->cm.skb_queue);
1414
1415 if (skb_dst(skb))
1416 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1417
1418 skb_queue_tail(&priv->cm.skb_queue, skb);
1419 if (e)
1420 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1421}
1422
1423static void ipoib_cm_rx_reap(struct work_struct *work)
1424{
1425 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1426 cm.rx_reap_task)->dev);
1427}
1428
1429static void ipoib_cm_stale_task(struct work_struct *work)
1430{
1431 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1432 cm.stale_task.work);
1433 struct ipoib_cm_rx *p;
1434 int ret;
1435
1436 spin_lock_irq(&priv->lock);
1437 while (!list_empty(&priv->cm.passive_ids)) {
1438
1439
1440 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1441 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1442 break;
1443 list_move(&p->list, &priv->cm.rx_error_list);
1444 p->state = IPOIB_CM_RX_ERROR;
1445 spin_unlock_irq(&priv->lock);
1446 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1447 if (ret)
1448 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1449 spin_lock_irq(&priv->lock);
1450 }
1451
1452 if (!list_empty(&priv->cm.passive_ids))
1453 queue_delayed_work(ipoib_workqueue,
1454 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1455 spin_unlock_irq(&priv->lock);
1456}
1457
1458
1459static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1460 char *buf)
1461{
1462 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1463
1464 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1465 return sprintf(buf, "connected\n");
1466 else
1467 return sprintf(buf, "datagram\n");
1468}
1469
1470static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1471 const char *buf, size_t count)
1472{
1473 struct net_device *dev = to_net_dev(d);
1474 int ret;
1475
1476 if (!rtnl_trylock())
1477 return restart_syscall();
1478
1479 ret = ipoib_set_mode(dev, buf);
1480
1481 rtnl_unlock();
1482
1483 if (!ret)
1484 return count;
1485
1486 return ret;
1487}
1488
1489static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1490
1491int ipoib_cm_add_mode_attr(struct net_device *dev)
1492{
1493 return device_create_file(&dev->dev, &dev_attr_mode);
1494}
1495
1496static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1497{
1498 struct ipoib_dev_priv *priv = netdev_priv(dev);
1499 struct ib_srq_init_attr srq_init_attr = {
1500 .srq_type = IB_SRQT_BASIC,
1501 .attr = {
1502 .max_wr = ipoib_recvq_size,
1503 .max_sge = max_sge
1504 }
1505 };
1506
1507 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1508 if (IS_ERR(priv->cm.srq)) {
1509 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1510 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1511 priv->ca->name, PTR_ERR(priv->cm.srq));
1512 priv->cm.srq = NULL;
1513 return;
1514 }
1515
1516 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1517 if (!priv->cm.srq_ring) {
1518 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1519 priv->ca->name, ipoib_recvq_size);
1520 ib_destroy_srq(priv->cm.srq);
1521 priv->cm.srq = NULL;
1522 return;
1523 }
1524
1525}
1526
1527int ipoib_cm_dev_init(struct net_device *dev)
1528{
1529 struct ipoib_dev_priv *priv = netdev_priv(dev);
1530 int i, ret;
1531 struct ib_device_attr attr;
1532
1533 INIT_LIST_HEAD(&priv->cm.passive_ids);
1534 INIT_LIST_HEAD(&priv->cm.reap_list);
1535 INIT_LIST_HEAD(&priv->cm.start_list);
1536 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1537 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1538 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1539 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1540 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1541 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1542 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1543 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1544 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1545
1546 skb_queue_head_init(&priv->cm.skb_queue);
1547
1548 ret = ib_query_device(priv->ca, &attr);
1549 if (ret) {
1550 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1551 return ret;
1552 }
1553
1554 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1555
1556 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1557 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1558 if (ipoib_cm_has_srq(dev)) {
1559 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1560 priv->cm.num_frags = attr.max_srq_sge;
1561 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1562 priv->cm.max_cm_mtu, priv->cm.num_frags);
1563 } else {
1564 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1565 priv->cm.num_frags = IPOIB_CM_RX_SG;
1566 }
1567
1568 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1569
1570 if (ipoib_cm_has_srq(dev)) {
1571 for (i = 0; i < ipoib_recvq_size; ++i) {
1572 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1573 priv->cm.num_frags - 1,
1574 priv->cm.srq_ring[i].mapping,
1575 GFP_KERNEL)) {
1576 ipoib_warn(priv, "failed to allocate "
1577 "receive buffer %d\n", i);
1578 ipoib_cm_dev_cleanup(dev);
1579 return -ENOMEM;
1580 }
1581
1582 if (ipoib_cm_post_receive_srq(dev, i)) {
1583 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1584 "failed for buf %d\n", i);
1585 ipoib_cm_dev_cleanup(dev);
1586 return -EIO;
1587 }
1588 }
1589 }
1590
1591 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1592 return 0;
1593}
1594
1595void ipoib_cm_dev_cleanup(struct net_device *dev)
1596{
1597 struct ipoib_dev_priv *priv = netdev_priv(dev);
1598 int ret;
1599
1600 if (!priv->cm.srq)
1601 return;
1602
1603 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1604
1605 ret = ib_destroy_srq(priv->cm.srq);
1606 if (ret)
1607 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1608
1609 priv->cm.srq = NULL;
1610 if (!priv->cm.srq_ring)
1611 return;
1612
1613 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1614 priv->cm.srq_ring = NULL;
1615}
1616
