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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
66#define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
67
68static struct ib_qp_attr ipoib_cm_err_attr = {
69 .qp_state = IB_QPS_ERR
70};
71
72#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
73
74static struct ib_send_wr ipoib_cm_rx_drain_wr = {
75 .opcode = IB_WR_SEND,
76};
77
78static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
79 struct ib_cm_event *event);
80
81static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
82 u64 mapping[IPOIB_CM_RX_SG])
83{
84 int i;
85
86 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
87
88 for (i = 0; i < frags; ++i)
89 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
90}
91
92static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
93{
94 struct ipoib_dev_priv *priv = netdev_priv(dev);
95 struct ib_recv_wr *bad_wr;
96 int i, ret;
97
98 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
99
100 for (i = 0; i < priv->cm.num_frags; ++i)
101 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
102
103 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
104 if (unlikely(ret)) {
105 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
106 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
107 priv->cm.srq_ring[id].mapping);
108 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
109 priv->cm.srq_ring[id].skb = NULL;
110 }
111
112 return ret;
113}
114
115static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
116 struct ipoib_cm_rx *rx,
117 struct ib_recv_wr *wr,
118 struct ib_sge *sge, int id)
119{
120 struct ipoib_dev_priv *priv = netdev_priv(dev);
121 struct ib_recv_wr *bad_wr;
122 int i, ret;
123
124 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
125
126 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
127 sge[i].addr = rx->rx_ring[id].mapping[i];
128
129 ret = ib_post_recv(rx->qp, wr, &bad_wr);
130 if (unlikely(ret)) {
131 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
132 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
133 rx->rx_ring[id].mapping);
134 dev_kfree_skb_any(rx->rx_ring[id].skb);
135 rx->rx_ring[id].skb = NULL;
136 }
137
138 return ret;
139}
140
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 = netdev_priv(dev);
148 struct sk_buff *skb;
149 int i;
150
151 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
152 if (unlikely(!skb))
153 return NULL;
154
155
156
157
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 = netdev_priv(dev);
199 int i;
200
201 for (i = 0; i < ipoib_recvq_size; ++i)
202 if (rx_ring[i].skb) {
203 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
204 rx_ring[i].mapping);
205 dev_kfree_skb_any(rx_ring[i].skb);
206 }
207
208 vfree(rx_ring);
209}
210
211static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
212{
213 struct ib_send_wr *bad_wr;
214 struct ipoib_cm_rx *p;
215
216
217
218 if (list_empty(&priv->cm.rx_flush_list) ||
219 !list_empty(&priv->cm.rx_drain_list))
220 return;
221
222
223
224
225
226 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
227 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
228 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
229 ipoib_warn(priv, "failed to post drain wr\n");
230
231 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
232}
233
234static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
235{
236 struct ipoib_cm_rx *p = ctx;
237 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
238 unsigned long flags;
239
240 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
241 return;
242
243 spin_lock_irqsave(&priv->lock, flags);
244 list_move(&p->list, &priv->cm.rx_flush_list);
245 p->state = IPOIB_CM_RX_FLUSH;
246 ipoib_cm_start_rx_drain(priv);
247 spin_unlock_irqrestore(&priv->lock, flags);
248}
249
250static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
251 struct ipoib_cm_rx *p)
252{
253 struct ipoib_dev_priv *priv = netdev_priv(dev);
254 struct ib_qp_init_attr attr = {
255 .event_handler = ipoib_cm_rx_event_handler,
256 .send_cq = priv->recv_cq,
257 .recv_cq = priv->recv_cq,
258 .srq = priv->cm.srq,
259 .cap.max_send_wr = 1,
260 .cap.max_send_sge = 1,
261 .sq_sig_type = IB_SIGNAL_ALL_WR,
262 .qp_type = IB_QPT_RC,
263 .qp_context = p,
264 };
265
266 if (!ipoib_cm_has_srq(dev)) {
267 attr.cap.max_recv_wr = ipoib_recvq_size;
268 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
269 }
270
271 return ib_create_qp(priv->pd, &attr);
272}
273
274static int ipoib_cm_modify_rx_qp(struct net_device *dev,
275 struct ib_cm_id *cm_id, struct ib_qp *qp,
276 unsigned psn)
277{
278 struct ipoib_dev_priv *priv = netdev_priv(dev);
279 struct ib_qp_attr qp_attr;
280 int qp_attr_mask, ret;
281
282 qp_attr.qp_state = IB_QPS_INIT;
283 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
284 if (ret) {
285 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
286 return ret;
287 }
288 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
289 if (ret) {
290 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
291 return ret;
292 }
293 qp_attr.qp_state = IB_QPS_RTR;
294 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
295 if (ret) {
296 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
297 return ret;
298 }
299 qp_attr.rq_psn = psn;
300 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
301 if (ret) {
302 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
303 return ret;
304 }
305
306
307
308
309
310
311
312
313
314 qp_attr.qp_state = IB_QPS_RTS;
315 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
316 if (ret) {
317 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
318 return 0;
319 }
320 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
321 if (ret) {
322 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
323 return 0;
324 }
325
326 return 0;
327}
328
329static void ipoib_cm_init_rx_wr(struct net_device *dev,
330 struct ib_recv_wr *wr,
331 struct ib_sge *sge)
332{
333 struct ipoib_dev_priv *priv = netdev_priv(dev);
334 int i;
335
336 for (i = 0; i < priv->cm.num_frags; ++i)
337 sge[i].lkey = priv->pd->local_dma_lkey;
338
339 sge[0].length = IPOIB_CM_HEAD_SIZE;
340 for (i = 1; i < priv->cm.num_frags; ++i)
341 sge[i].length = PAGE_SIZE;
342
343 wr->next = NULL;
344 wr->sg_list = sge;
345 wr->num_sge = priv->cm.num_frags;
346}
347
348static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
349 struct ipoib_cm_rx *rx)
350{
351 struct ipoib_dev_priv *priv = netdev_priv(dev);
352 struct {
353 struct ib_recv_wr wr;
354 struct ib_sge sge[IPOIB_CM_RX_SG];
355 } *t;
356 int ret;
357 int i;
358
359 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
360 if (!rx->rx_ring) {
361 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
362 priv->ca->name, ipoib_recvq_size);
363 return -ENOMEM;
364 }
365
366 t = kmalloc(sizeof *t, GFP_KERNEL);
367 if (!t) {
368 ret = -ENOMEM;
369 goto err_free;
370 }
371
372 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
373
374 spin_lock_irq(&priv->lock);
375
376 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
377 spin_unlock_irq(&priv->lock);
378 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
379 ret = -EINVAL;
380 goto err_free;
381 } else
382 ++priv->cm.nonsrq_conn_qp;
383
384 spin_unlock_irq(&priv->lock);
385
386 for (i = 0; i < ipoib_recvq_size; ++i) {
387 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
388 rx->rx_ring[i].mapping,
389 GFP_KERNEL)) {
390 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
391 ret = -ENOMEM;
392 goto err_count;
393 }
394 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
395 if (ret) {
396 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
397 "failed for buf %d\n", i);
398 ret = -EIO;
399 goto err_count;
400 }
401 }
402
403 rx->recv_count = ipoib_recvq_size;
404
405 kfree(t);
406
407 return 0;
408
409err_count:
410 spin_lock_irq(&priv->lock);
411 --priv->cm.nonsrq_conn_qp;
412 spin_unlock_irq(&priv->lock);
413
414err_free:
415 kfree(t);
416 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
417
418 return ret;
419}
420
421static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
422 struct ib_qp *qp, struct ib_cm_req_event_param *req,
423 unsigned psn)
424{
425 struct ipoib_dev_priv *priv = netdev_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, struct ib_cm_event *event)
443{
444 struct net_device *dev = cm_id->context;
445 struct ipoib_dev_priv *priv = netdev_priv(dev);
446 struct ipoib_cm_rx *p;
447 unsigned psn;
448 int ret;
449
450 ipoib_dbg(priv, "REQ arrived\n");
451 p = kzalloc(sizeof *p, GFP_KERNEL);
452 if (!p)
453 return -ENOMEM;
454 p->dev = dev;
455 p->id = cm_id;
456 cm_id->context = p;
457 p->state = IPOIB_CM_RX_LIVE;
458 p->jiffies = jiffies;
459 INIT_LIST_HEAD(&p->list);
460
461 p->qp = ipoib_cm_create_rx_qp(dev, p);
462 if (IS_ERR(p->qp)) {
463 ret = PTR_ERR(p->qp);
464 goto err_qp;
465 }
466
467 psn = prandom_u32() & 0xffffff;
468 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
469 if (ret)
470 goto err_modify;
471
472 if (!ipoib_cm_has_srq(dev)) {
473 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
474 if (ret)
475 goto err_modify;
476 }
477
478 spin_lock_irq(&priv->lock);
479 queue_delayed_work(priv->wq,
480 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
481
482
483 p->jiffies = jiffies;
484 if (p->state == IPOIB_CM_RX_LIVE)
485 list_move(&p->list, &priv->cm.passive_ids);
486 spin_unlock_irq(&priv->lock);
487
488 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
489 if (ret) {
490 ipoib_warn(priv, "failed to send REP: %d\n", ret);
491 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
492 ipoib_warn(priv, "unable to move qp to error state\n");
493 }
494 return 0;
495
496err_modify:
497 ib_destroy_qp(p->qp);
498err_qp:
499 kfree(p);
500 return ret;
501}
502
503static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
504 struct ib_cm_event *event)
505{
506 struct ipoib_cm_rx *p;
507 struct ipoib_dev_priv *priv;
508
509 switch (event->event) {
510 case IB_CM_REQ_RECEIVED:
511 return ipoib_cm_req_handler(cm_id, event);
512 case IB_CM_DREQ_RECEIVED:
513 p = cm_id->context;
514 ib_send_cm_drep(cm_id, NULL, 0);
515
516 case IB_CM_REJ_RECEIVED:
517 p = cm_id->context;
518 priv = netdev_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
522 default:
523 return 0;
524 }
525}
526
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
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
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(length, (unsigned) 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 = netdev_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, "cm recv error "
598 "(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
619
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 - min(wc->byte_len,
644 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
645
646 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
647 mapping, GFP_ATOMIC);
648 if (unlikely(!newskb)) {
649
650
651
652
653 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
654 ++dev->stats.rx_dropped;
655 goto repost;
656 }
657
658 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
659 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
660
661 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
662 wc->byte_len, wc->slid);
663
664 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
665
666copied:
667 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
668 skb_add_pseudo_hdr(skb);
669
670 ++dev->stats.rx_packets;
671 dev->stats.rx_bytes += skb->len;
672
673 skb->dev = dev;
674
675 skb->pkt_type = PACKET_HOST;
676 netif_receive_skb(skb);
677
678repost:
679 if (has_srq) {
680 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
681 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
682 "for buf %d\n", wr_id);
683 } else {
684 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
685 &priv->cm.rx_wr,
686 priv->cm.rx_sge,
687 wr_id))) {
688 --p->recv_count;
689 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
690 "for buf %d\n", wr_id);
691 }
692 }
693}
694
695static inline int post_send(struct ipoib_dev_priv *priv,
696 struct ipoib_cm_tx *tx,
697 unsigned int wr_id,
698 struct ipoib_tx_buf *tx_req)
699{
700 struct ib_send_wr *bad_wr;
701
702 ipoib_build_sge(priv, tx_req);
703
704 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
705
706 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
707}
708
709void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
710{
711 struct ipoib_dev_priv *priv = netdev_priv(dev);
712 struct ipoib_tx_buf *tx_req;
713 int rc;
714 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
715
716 if (unlikely(skb->len > tx->mtu)) {
717 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
718 skb->len, tx->mtu);
719 ++dev->stats.tx_dropped;
720 ++dev->stats.tx_errors;
721 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
722 return;
723 }
724 if (skb_shinfo(skb)->nr_frags > usable_sge) {
725 if (skb_linearize(skb) < 0) {
726 ipoib_warn(priv, "skb could not be linearized\n");
727 ++dev->stats.tx_dropped;
728 ++dev->stats.tx_errors;
729 dev_kfree_skb_any(skb);
730 return;
731 }
732
733 if (skb_shinfo(skb)->nr_frags > usable_sge) {
734 ipoib_warn(priv, "too many frags after skb linearize\n");
735 ++dev->stats.tx_dropped;
736 ++dev->stats.tx_errors;
737 dev_kfree_skb_any(skb);
738 return;
739 }
740 }
741 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
742 tx->tx_head, skb->len, tx->qp->qp_num);
743
744
745
746
747
748
749
750
751 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
752 tx_req->skb = skb;
753
754 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
755 ++dev->stats.tx_errors;
756 dev_kfree_skb_any(skb);
757 return;
758 }
759
760 skb_orphan(skb);
761 skb_dst_drop(skb);
762
763 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
764 if (unlikely(rc)) {
765 ipoib_warn(priv, "post_send failed, error %d\n", rc);
766 ++dev->stats.tx_errors;
767 ipoib_dma_unmap_tx(priv, tx_req);
768 dev_kfree_skb_any(skb);
769 } else {
770 netif_trans_update(dev);
771 ++tx->tx_head;
772
773 if (++priv->tx_outstanding == ipoib_sendq_size) {
774 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
775 tx->qp->qp_num);
776 netif_stop_queue(dev);
777 rc = ib_req_notify_cq(priv->send_cq,
778 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
779 if (rc < 0)
780 ipoib_warn(priv, "request notify on send CQ failed\n");
781 else if (rc)
782 ipoib_send_comp_handler(priv->send_cq, dev);
783 }
784 }
785}
786
787void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
788{
789 struct ipoib_dev_priv *priv = netdev_priv(dev);
790 struct ipoib_cm_tx *tx = wc->qp->qp_context;
791 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
792 struct ipoib_tx_buf *tx_req;
793 unsigned long flags;
794
795 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
796 wr_id, wc->status);
797
798 if (unlikely(wr_id >= ipoib_sendq_size)) {
799 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
800 wr_id, ipoib_sendq_size);
801 return;
802 }
803
804 tx_req = &tx->tx_ring[wr_id];
805
806 ipoib_dma_unmap_tx(priv, tx_req);
807
808
809 ++dev->stats.tx_packets;
810 dev->stats.tx_bytes += tx_req->skb->len;
811
812 dev_kfree_skb_any(tx_req->skb);
813
814 netif_tx_lock(dev);
815
816 ++tx->tx_tail;
817 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
818 netif_queue_stopped(dev) &&
819 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
820 netif_wake_queue(dev);
821
822 if (wc->status != IB_WC_SUCCESS &&
823 wc->status != IB_WC_WR_FLUSH_ERR) {
824 struct ipoib_neigh *neigh;
825
826 ipoib_dbg(priv, "failed cm send event "
827 "(status=%d, wrid=%d vend_err %x)\n",
828 wc->status, wr_id, wc->vendor_err);
829
830 spin_lock_irqsave(&priv->lock, flags);
831 neigh = tx->neigh;
832
833 if (neigh) {
834 neigh->cm = NULL;
835 ipoib_neigh_free(neigh);
836
837 tx->neigh = NULL;
838 }
839
840 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
841 list_move(&tx->list, &priv->cm.reap_list);
842 queue_work(priv->wq, &priv->cm.reap_task);
843 }
844
845 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
846
847 spin_unlock_irqrestore(&priv->lock, flags);
848 }
849
850 netif_tx_unlock(dev);
851}
852
853int ipoib_cm_dev_open(struct net_device *dev)
854{
855 struct ipoib_dev_priv *priv = netdev_priv(dev);
856 int ret;
857
858 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
859 return 0;
860
861 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
862 if (IS_ERR(priv->cm.id)) {
863 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
864 ret = PTR_ERR(priv->cm.id);
865 goto err_cm;
866 }
867
868 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
869 0);
870 if (ret) {
871 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
872 IPOIB_CM_IETF_ID | priv->qp->qp_num);
873 goto err_listen;
874 }
875
876 return 0;
877
878err_listen:
879 ib_destroy_cm_id(priv->cm.id);
880err_cm:
881 priv->cm.id = NULL;
882 return ret;
883}
884
885static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
886{
887 struct ipoib_dev_priv *priv = netdev_priv(dev);
888 struct ipoib_cm_rx *rx, *n;
889 LIST_HEAD(list);
890
891 spin_lock_irq(&priv->lock);
892 list_splice_init(&priv->cm.rx_reap_list, &list);
893 spin_unlock_irq(&priv->lock);
894
895 list_for_each_entry_safe(rx, n, &list, list) {
896 ib_destroy_cm_id(rx->id);
897 ib_destroy_qp(rx->qp);
898 if (!ipoib_cm_has_srq(dev)) {
899 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
900 spin_lock_irq(&priv->lock);
901 --priv->cm.nonsrq_conn_qp;
902 spin_unlock_irq(&priv->lock);
903 }
904 kfree(rx);
905 }
906}
907
908void ipoib_cm_dev_stop(struct net_device *dev)
909{
910 struct ipoib_dev_priv *priv = netdev_priv(dev);
911 struct ipoib_cm_rx *p;
912 unsigned long begin;
913 int ret;
914
915 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
916 return;
917
918 ib_destroy_cm_id(priv->cm.id);
919 priv->cm.id = NULL;
920
921 spin_lock_irq(&priv->lock);
922 while (!list_empty(&priv->cm.passive_ids)) {
923 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
924 list_move(&p->list, &priv->cm.rx_error_list);
925 p->state = IPOIB_CM_RX_ERROR;
926 spin_unlock_irq(&priv->lock);
927 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
928 if (ret)
929 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
930 spin_lock_irq(&priv->lock);
931 }
932
933
934 begin = jiffies;
935
936 while (!list_empty(&priv->cm.rx_error_list) ||
937 !list_empty(&priv->cm.rx_flush_list) ||
938 !list_empty(&priv->cm.rx_drain_list)) {
939 if (time_after(jiffies, begin + 5 * HZ)) {
940 ipoib_warn(priv, "RX drain timing out\n");
941
942
943
944
945 list_splice_init(&priv->cm.rx_flush_list,
946 &priv->cm.rx_reap_list);
947 list_splice_init(&priv->cm.rx_error_list,
948 &priv->cm.rx_reap_list);
949 list_splice_init(&priv->cm.rx_drain_list,
950 &priv->cm.rx_reap_list);
951 break;
952 }
953 spin_unlock_irq(&priv->lock);
954 msleep(1);
955 ipoib_drain_cq(dev);
956 spin_lock_irq(&priv->lock);
957 }
958
959 spin_unlock_irq(&priv->lock);
960
961 ipoib_cm_free_rx_reap_list(dev);
962
963 cancel_delayed_work(&priv->cm.stale_task);
964}
965
966static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
967{
968 struct ipoib_cm_tx *p = cm_id->context;
969 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
970 struct ipoib_cm_data *data = event->private_data;
971 struct sk_buff_head skqueue;
972 struct ib_qp_attr qp_attr;
973 int qp_attr_mask, ret;
974 struct sk_buff *skb;
975
976 p->mtu = be32_to_cpu(data->mtu);
977
978 if (p->mtu <= IPOIB_ENCAP_LEN) {
979 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
980 p->mtu, IPOIB_ENCAP_LEN);
981 return -EINVAL;
982 }
983
984 qp_attr.qp_state = IB_QPS_RTR;
985 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
986 if (ret) {
987 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
988 return ret;
989 }
990
991 qp_attr.rq_psn = 0 ;
992 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
993 if (ret) {
994 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
995 return ret;
996 }
997
998 qp_attr.qp_state = IB_QPS_RTS;
999 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1000 if (ret) {
1001 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1002 return ret;
1003 }
1004 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1005 if (ret) {
1006 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1007 return ret;
1008 }
1009
1010 skb_queue_head_init(&skqueue);
1011
1012 spin_lock_irq(&priv->lock);
1013 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1014 if (p->neigh)
1015 while ((skb = __skb_dequeue(&p->neigh->queue)))
1016 __skb_queue_tail(&skqueue, skb);
1017 spin_unlock_irq(&priv->lock);
1018
1019 while ((skb = __skb_dequeue(&skqueue))) {
1020 skb->dev = p->dev;
1021 if (dev_queue_xmit(skb))
1022 ipoib_warn(priv, "dev_queue_xmit failed "
1023 "to requeue packet\n");
1024 }
1025
1026 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1027 if (ret) {
1028 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1029 return ret;
1030 }
1031 return 0;
1032}
1033
1034static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1035{
1036 struct ipoib_dev_priv *priv = netdev_priv(dev);
1037 struct ib_qp_init_attr attr = {
1038 .send_cq = priv->recv_cq,
1039 .recv_cq = priv->recv_cq,
1040 .srq = priv->cm.srq,
1041 .cap.max_send_wr = ipoib_sendq_size,
1042 .cap.max_send_sge = 1,
1043 .sq_sig_type = IB_SIGNAL_ALL_WR,
1044 .qp_type = IB_QPT_RC,
1045 .qp_context = tx,
1046 .create_flags = IB_QP_CREATE_USE_GFP_NOIO
1047 };
1048
1049 struct ib_qp *tx_qp;
1050
1051 if (dev->features & NETIF_F_SG)
1052 attr.cap.max_send_sge =
1053 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1054
1055 tx_qp = ib_create_qp(priv->pd, &attr);
1056 if (PTR_ERR(tx_qp) == -EINVAL) {
1057 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n",
1058 priv->ca->name);
1059 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1060 tx_qp = ib_create_qp(priv->pd, &attr);
1061 }
1062 tx->max_send_sge = attr.cap.max_send_sge;
1063 return tx_qp;
1064}
1065
1066static int ipoib_cm_send_req(struct net_device *dev,
1067 struct ib_cm_id *id, struct ib_qp *qp,
1068 u32 qpn,
1069 struct ib_sa_path_rec *pathrec)
1070{
1071 struct ipoib_dev_priv *priv = netdev_priv(dev);
1072 struct ipoib_cm_data data = {};
1073 struct ib_cm_req_param req = {};
1074
1075 data.qpn = cpu_to_be32(priv->qp->qp_num);
1076 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1077
1078 req.primary_path = pathrec;
1079 req.alternate_path = NULL;
1080 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1081 req.qp_num = qp->qp_num;
1082 req.qp_type = qp->qp_type;
1083 req.private_data = &data;
1084 req.private_data_len = sizeof data;
1085 req.flow_control = 0;
1086
1087 req.starting_psn = 0;
1088
1089
1090
1091
1092
1093 req.responder_resources = 4;
1094 req.remote_cm_response_timeout = 20;
1095 req.local_cm_response_timeout = 20;
1096 req.retry_count = 0;
1097 req.rnr_retry_count = 0;
1098 req.max_cm_retries = 15;
1099 req.srq = ipoib_cm_has_srq(dev);
1100 return ib_send_cm_req(id, &req);
1101}
1102
1103static int ipoib_cm_modify_tx_init(struct net_device *dev,
1104 struct ib_cm_id *cm_id, struct ib_qp *qp)
1105{
1106 struct ipoib_dev_priv *priv = netdev_priv(dev);
1107 struct ib_qp_attr qp_attr;
1108 int qp_attr_mask, ret;
1109 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1110 if (ret) {
1111 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1112 return ret;
1113 }
1114
1115 qp_attr.qp_state = IB_QPS_INIT;
1116 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1117 qp_attr.port_num = priv->port;
1118 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1119
1120 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1121 if (ret) {
1122 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1123 return ret;
1124 }
1125 return 0;
1126}
1127
1128static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1129 struct ib_sa_path_rec *pathrec)
1130{
1131 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1132 int ret;
1133
1134 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1135 GFP_NOIO, PAGE_KERNEL);
1136 if (!p->tx_ring) {
1137 ipoib_warn(priv, "failed to allocate tx ring\n");
1138 ret = -ENOMEM;
1139 goto err_tx;
1140 }
1141 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1142
1143 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1144 if (IS_ERR(p->qp)) {
1145 ret = PTR_ERR(p->qp);
1146 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1147 goto err_qp;
1148 }
1149
1150 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1151 if (IS_ERR(p->id)) {
1152 ret = PTR_ERR(p->id);
1153 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1154 goto err_id;
1155 }
1156
1157 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1158 if (ret) {
1159 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1160 goto err_modify;
1161 }
1162
1163 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1164 if (ret) {
1165 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1166 goto err_send_cm;
1167 }
1168
1169 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1170 p->qp->qp_num, pathrec->dgid.raw, qpn);
1171
1172 return 0;
1173
1174err_send_cm:
1175err_modify:
1176 ib_destroy_cm_id(p->id);
1177err_id:
1178 p->id = NULL;
1179 ib_destroy_qp(p->qp);
1180err_qp:
1181 p->qp = NULL;
1182 vfree(p->tx_ring);
1183err_tx:
1184 return ret;
1185}
1186
1187static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1188{
1189 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1190 struct ipoib_tx_buf *tx_req;
1191 unsigned long begin;
1192
1193 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1194 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1195
1196 if (p->id)
1197 ib_destroy_cm_id(p->id);
1198
1199 if (p->tx_ring) {
1200
1201 begin = jiffies;
1202 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1203 if (time_after(jiffies, begin + 5 * HZ)) {
1204 ipoib_warn(priv, "timing out; %d sends not completed\n",
1205 p->tx_head - p->tx_tail);
1206 goto timeout;
1207 }
1208
1209 msleep(1);
1210 }
1211 }
1212
1213timeout:
1214
1215 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1216 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1217 ipoib_dma_unmap_tx(priv, tx_req);
1218 dev_kfree_skb_any(tx_req->skb);
1219 ++p->tx_tail;
1220 netif_tx_lock_bh(p->dev);
1221 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1222 netif_queue_stopped(p->dev) &&
1223 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1224 netif_wake_queue(p->dev);
1225 netif_tx_unlock_bh(p->dev);
1226 }
1227
1228 if (p->qp)
1229 ib_destroy_qp(p->qp);
1230
1231 vfree(p->tx_ring);
1232 kfree(p);
1233}
1234
1235static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1236 struct ib_cm_event *event)
1237{
1238 struct ipoib_cm_tx *tx = cm_id->context;
1239 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1240 struct net_device *dev = priv->dev;
1241 struct ipoib_neigh *neigh;
1242 unsigned long flags;
1243 int ret;
1244
1245 switch (event->event) {
1246 case IB_CM_DREQ_RECEIVED:
1247 ipoib_dbg(priv, "DREQ received.\n");
1248 ib_send_cm_drep(cm_id, NULL, 0);
1249 break;
1250 case IB_CM_REP_RECEIVED:
1251 ipoib_dbg(priv, "REP received.\n");
1252 ret = ipoib_cm_rep_handler(cm_id, event);
1253 if (ret)
1254 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1255 NULL, 0, NULL, 0);
1256 break;
1257 case IB_CM_REQ_ERROR:
1258 case IB_CM_REJ_RECEIVED:
1259 case IB_CM_TIMEWAIT_EXIT:
1260 ipoib_dbg(priv, "CM error %d.\n", event->event);
1261 netif_tx_lock_bh(dev);
1262 spin_lock_irqsave(&priv->lock, flags);
1263 neigh = tx->neigh;
1264
1265 if (neigh) {
1266 neigh->cm = NULL;
1267 ipoib_neigh_free(neigh);
1268
1269 tx->neigh = NULL;
1270 }
1271
1272 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1273 list_move(&tx->list, &priv->cm.reap_list);
1274 queue_work(priv->wq, &priv->cm.reap_task);
1275 }
1276
1277 spin_unlock_irqrestore(&priv->lock, flags);
1278 netif_tx_unlock_bh(dev);
1279 break;
1280 default:
1281 break;
1282 }
1283
1284 return 0;
1285}
1286
1287struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1288 struct ipoib_neigh *neigh)
1289{
1290 struct ipoib_dev_priv *priv = netdev_priv(dev);
1291 struct ipoib_cm_tx *tx;
1292
1293 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1294 if (!tx)
1295 return NULL;
1296
1297 neigh->cm = tx;
1298 tx->neigh = neigh;
1299 tx->path = path;
1300 tx->dev = dev;
1301 list_add(&tx->list, &priv->cm.start_list);
1302 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1303 queue_work(priv->wq, &priv->cm.start_task);
1304 return tx;
1305}
1306
1307void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1308{
1309 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1310 unsigned long flags;
1311 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1312 spin_lock_irqsave(&priv->lock, flags);
1313 list_move(&tx->list, &priv->cm.reap_list);
1314 queue_work(priv->wq, &priv->cm.reap_task);
1315 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1316 tx->neigh->daddr + 4);
1317 tx->neigh = NULL;
1318 spin_unlock_irqrestore(&priv->lock, flags);
1319 }
1320}
1321
1322#define QPN_AND_OPTIONS_OFFSET 4
1323
1324static void ipoib_cm_tx_start(struct work_struct *work)
1325{
1326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1327 cm.start_task);
1328 struct net_device *dev = priv->dev;
1329 struct ipoib_neigh *neigh;
1330 struct ipoib_cm_tx *p;
1331 unsigned long flags;
1332 struct ipoib_path *path;
1333 int ret;
1334
1335 struct ib_sa_path_rec pathrec;
1336 u32 qpn;
1337
1338 netif_tx_lock_bh(dev);
1339 spin_lock_irqsave(&priv->lock, flags);
1340
1341 while (!list_empty(&priv->cm.start_list)) {
1342 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1343 list_del_init(&p->list);
1344 neigh = p->neigh;
1345
1346 qpn = IPOIB_QPN(neigh->daddr);
1347
1348
1349
1350
1351 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1352 if (!path) {
1353 pr_info("%s ignore not valid path %pI6\n",
1354 __func__,
1355 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1356 goto free_neigh;
1357 }
1358 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1359
1360 spin_unlock_irqrestore(&priv->lock, flags);
1361 netif_tx_unlock_bh(dev);
1362
1363 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1364
1365 netif_tx_lock_bh(dev);
1366 spin_lock_irqsave(&priv->lock, flags);
1367
1368 if (ret) {
1369free_neigh:
1370 neigh = p->neigh;
1371 if (neigh) {
1372 neigh->cm = NULL;
1373 ipoib_neigh_free(neigh);
1374 }
1375 list_del(&p->list);
1376 kfree(p);
1377 }
1378 }
1379
1380 spin_unlock_irqrestore(&priv->lock, flags);
1381 netif_tx_unlock_bh(dev);
1382}
1383
1384static void ipoib_cm_tx_reap(struct work_struct *work)
1385{
1386 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1387 cm.reap_task);
1388 struct net_device *dev = priv->dev;
1389 struct ipoib_cm_tx *p;
1390 unsigned long flags;
1391
1392 netif_tx_lock_bh(dev);
1393 spin_lock_irqsave(&priv->lock, flags);
1394
1395 while (!list_empty(&priv->cm.reap_list)) {
1396 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1397 list_del(&p->list);
1398 spin_unlock_irqrestore(&priv->lock, flags);
1399 netif_tx_unlock_bh(dev);
1400 ipoib_cm_tx_destroy(p);
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
1409static void ipoib_cm_skb_reap(struct work_struct *work)
1410{
1411 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1412 cm.skb_task);
1413 struct net_device *dev = priv->dev;
1414 struct sk_buff *skb;
1415 unsigned long flags;
1416 unsigned mtu = priv->mcast_mtu;
1417
1418 netif_tx_lock_bh(dev);
1419 spin_lock_irqsave(&priv->lock, flags);
1420
1421 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1422 spin_unlock_irqrestore(&priv->lock, flags);
1423 netif_tx_unlock_bh(dev);
1424
1425 if (skb->protocol == htons(ETH_P_IP))
1426 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1427#if IS_ENABLED(CONFIG_IPV6)
1428 else if (skb->protocol == htons(ETH_P_IPV6))
1429 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1430#endif
1431 dev_kfree_skb_any(skb);
1432
1433 netif_tx_lock_bh(dev);
1434 spin_lock_irqsave(&priv->lock, flags);
1435 }
1436
1437 spin_unlock_irqrestore(&priv->lock, flags);
1438 netif_tx_unlock_bh(dev);
1439}
1440
1441void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1442 unsigned int mtu)
1443{
1444 struct ipoib_dev_priv *priv = netdev_priv(dev);
1445 int e = skb_queue_empty(&priv->cm.skb_queue);
1446
1447 if (skb_dst(skb))
1448 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1449
1450 skb_queue_tail(&priv->cm.skb_queue, skb);
1451 if (e)
1452 queue_work(priv->wq, &priv->cm.skb_task);
1453}
1454
1455static void ipoib_cm_rx_reap(struct work_struct *work)
1456{
1457 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1458 cm.rx_reap_task)->dev);
1459}
1460
1461static void ipoib_cm_stale_task(struct work_struct *work)
1462{
1463 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1464 cm.stale_task.work);
1465 struct ipoib_cm_rx *p;
1466 int ret;
1467
1468 spin_lock_irq(&priv->lock);
1469 while (!list_empty(&priv->cm.passive_ids)) {
1470
1471
1472 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1473 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1474 break;
1475 list_move(&p->list, &priv->cm.rx_error_list);
1476 p->state = IPOIB_CM_RX_ERROR;
1477 spin_unlock_irq(&priv->lock);
1478 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1479 if (ret)
1480 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1481 spin_lock_irq(&priv->lock);
1482 }
1483
1484 if (!list_empty(&priv->cm.passive_ids))
1485 queue_delayed_work(priv->wq,
1486 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1487 spin_unlock_irq(&priv->lock);
1488}
1489
1490static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1491 char *buf)
1492{
1493 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1494
1495 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1496 return sprintf(buf, "connected\n");
1497 else
1498 return sprintf(buf, "datagram\n");
1499}
1500
1501static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1502 const char *buf, size_t count)
1503{
1504 struct net_device *dev = to_net_dev(d);
1505 int ret;
1506 struct ipoib_dev_priv *priv = netdev_priv(dev);
1507
1508 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1509 return -EPERM;
1510
1511 if (!rtnl_trylock())
1512 return restart_syscall();
1513
1514 ret = ipoib_set_mode(dev, buf);
1515
1516 rtnl_unlock();
1517
1518 if (!ret)
1519 return count;
1520
1521 return ret;
1522}
1523
1524static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1525
1526int ipoib_cm_add_mode_attr(struct net_device *dev)
1527{
1528 return device_create_file(&dev->dev, &dev_attr_mode);
1529}
1530
1531static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1532{
1533 struct ipoib_dev_priv *priv = netdev_priv(dev);
1534 struct ib_srq_init_attr srq_init_attr = {
1535 .srq_type = IB_SRQT_BASIC,
1536 .attr = {
1537 .max_wr = ipoib_recvq_size,
1538 .max_sge = max_sge
1539 }
1540 };
1541
1542 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1543 if (IS_ERR(priv->cm.srq)) {
1544 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1545 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1546 priv->ca->name, PTR_ERR(priv->cm.srq));
1547 priv->cm.srq = NULL;
1548 return;
1549 }
1550
1551 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1552 if (!priv->cm.srq_ring) {
1553 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1554 priv->ca->name, ipoib_recvq_size);
1555 ib_destroy_srq(priv->cm.srq);
1556 priv->cm.srq = NULL;
1557 return;
1558 }
1559
1560}
1561
1562int ipoib_cm_dev_init(struct net_device *dev)
1563{
1564 struct ipoib_dev_priv *priv = netdev_priv(dev);
1565 int max_srq_sge, i;
1566
1567 INIT_LIST_HEAD(&priv->cm.passive_ids);
1568 INIT_LIST_HEAD(&priv->cm.reap_list);
1569 INIT_LIST_HEAD(&priv->cm.start_list);
1570 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1571 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1572 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1573 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1574 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1575 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1576 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1577 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1578 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1579
1580 skb_queue_head_init(&priv->cm.skb_queue);
1581
1582 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1583
1584 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1585 ipoib_cm_create_srq(dev, max_srq_sge);
1586 if (ipoib_cm_has_srq(dev)) {
1587 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1588 priv->cm.num_frags = max_srq_sge;
1589 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1590 priv->cm.max_cm_mtu, priv->cm.num_frags);
1591 } else {
1592 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1593 priv->cm.num_frags = IPOIB_CM_RX_SG;
1594 }
1595
1596 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1597
1598 if (ipoib_cm_has_srq(dev)) {
1599 for (i = 0; i < ipoib_recvq_size; ++i) {
1600 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1601 priv->cm.num_frags - 1,
1602 priv->cm.srq_ring[i].mapping,
1603 GFP_KERNEL)) {
1604 ipoib_warn(priv, "failed to allocate "
1605 "receive buffer %d\n", i);
1606 ipoib_cm_dev_cleanup(dev);
1607 return -ENOMEM;
1608 }
1609
1610 if (ipoib_cm_post_receive_srq(dev, i)) {
1611 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1612 "failed for buf %d\n", i);
1613 ipoib_cm_dev_cleanup(dev);
1614 return -EIO;
1615 }
1616 }
1617 }
1618
1619 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1620 return 0;
1621}
1622
1623void ipoib_cm_dev_cleanup(struct net_device *dev)
1624{
1625 struct ipoib_dev_priv *priv = netdev_priv(dev);
1626 int ret;
1627
1628 if (!priv->cm.srq)
1629 return;
1630
1631 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1632
1633 ret = ib_destroy_srq(priv->cm.srq);
1634 if (ret)
1635 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1636
1637 priv->cm.srq = NULL;
1638 if (!priv->cm.srq_ring)
1639 return;
1640
1641 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1642 priv->cm.srq_ring = NULL;
1643}
1644
