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[~shefty/rdma-dev.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
1 /*
2  * Copyright (c) 2006 Mellanox Technologies. All rights reserved
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #include <rdma/ib_cm.h>
34 #include <net/dst.h>
35 #include <net/icmp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
41
42 #include "ipoib.h"
43
44 int ipoib_max_conn_qp = 128;
45
46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
47 MODULE_PARM_DESC(max_nonsrq_conn_qp,
48                  "Max number of connected-mode QPs per interface "
49                  "(applied only if shared receive queue is not available)");
50
51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
52 static int data_debug_level;
53
54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
55 MODULE_PARM_DESC(cm_data_debug_level,
56                  "Enable data path debug tracing for connected mode if > 0");
57 #endif
58
59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
60
61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
62 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
63 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
64 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
65
66 static struct ib_qp_attr ipoib_cm_err_attr = {
67         .qp_state = IB_QPS_ERR
68 };
69
70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
71
72 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
73         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
74         .opcode = IB_WR_SEND,
75 };
76
77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
78                                struct ib_cm_event *event);
79
80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
81                                   u64 mapping[IPOIB_CM_RX_SG])
82 {
83         int i;
84
85         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
86
87         for (i = 0; i < frags; ++i)
88                 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
89 }
90
91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
92 {
93         struct ipoib_dev_priv *priv = netdev_priv(dev);
94         struct ib_recv_wr *bad_wr;
95         int i, ret;
96
97         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
98
99         for (i = 0; i < priv->cm.num_frags; ++i)
100                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
101
102         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
103         if (unlikely(ret)) {
104                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
105                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
106                                       priv->cm.srq_ring[id].mapping);
107                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
108                 priv->cm.srq_ring[id].skb = NULL;
109         }
110
111         return ret;
112 }
113
114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
115                                         struct ipoib_cm_rx *rx,
116                                         struct ib_recv_wr *wr,
117                                         struct ib_sge *sge, int id)
118 {
119         struct ipoib_dev_priv *priv = netdev_priv(dev);
120         struct ib_recv_wr *bad_wr;
121         int i, ret;
122
123         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
124
125         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
126                 sge[i].addr = rx->rx_ring[id].mapping[i];
127
128         ret = ib_post_recv(rx->qp, wr, &bad_wr);
129         if (unlikely(ret)) {
130                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
131                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
132                                       rx->rx_ring[id].mapping);
133                 dev_kfree_skb_any(rx->rx_ring[id].skb);
134                 rx->rx_ring[id].skb = NULL;
135         }
136
137         return ret;
138 }
139
140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
141                                              struct ipoib_cm_rx_buf *rx_ring,
142                                              int id, int frags,
143                                              u64 mapping[IPOIB_CM_RX_SG])
144 {
145         struct ipoib_dev_priv *priv = netdev_priv(dev);
146         struct sk_buff *skb;
147         int i;
148
149         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
150         if (unlikely(!skb))
151                 return NULL;
152
153         /*
154          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
155          * IP header to a multiple of 16.
156          */
157         skb_reserve(skb, 12);
158
159         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
160                                        DMA_FROM_DEVICE);
161         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
162                 dev_kfree_skb_any(skb);
163                 return NULL;
164         }
165
166         for (i = 0; i < frags; i++) {
167                 struct page *page = alloc_page(GFP_ATOMIC);
168
169                 if (!page)
170                         goto partial_error;
171                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
172
173                 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
174                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
175                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
176                         goto partial_error;
177         }
178
179         rx_ring[id].skb = skb;
180         return skb;
181
182 partial_error:
183
184         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
185
186         for (; i > 0; --i)
187                 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
188
189         dev_kfree_skb_any(skb);
190         return NULL;
191 }
192
193 static void ipoib_cm_free_rx_ring(struct net_device *dev,
194                                   struct ipoib_cm_rx_buf *rx_ring)
195 {
196         struct ipoib_dev_priv *priv = netdev_priv(dev);
197         int i;
198
199         for (i = 0; i < ipoib_recvq_size; ++i)
200                 if (rx_ring[i].skb) {
201                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
202                                               rx_ring[i].mapping);
203                         dev_kfree_skb_any(rx_ring[i].skb);
204                 }
205
206         vfree(rx_ring);
207 }
208
209 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
210 {
211         struct ib_send_wr *bad_wr;
212         struct ipoib_cm_rx *p;
213
214         /* We only reserved 1 extra slot in CQ for drain WRs, so
215          * make sure we have at most 1 outstanding WR. */
216         if (list_empty(&priv->cm.rx_flush_list) ||
217             !list_empty(&priv->cm.rx_drain_list))
218                 return;
219
220         /*
221          * QPs on flush list are error state.  This way, a "flush
222          * error" WC will be immediately generated for each WR we post.
223          */
224         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
225         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
226                 ipoib_warn(priv, "failed to post drain wr\n");
227
228         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
229 }
230
231 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
232 {
233         struct ipoib_cm_rx *p = ctx;
234         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
235         unsigned long flags;
236
237         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
238                 return;
239
240         spin_lock_irqsave(&priv->lock, flags);
241         list_move(&p->list, &priv->cm.rx_flush_list);
242         p->state = IPOIB_CM_RX_FLUSH;
243         ipoib_cm_start_rx_drain(priv);
244         spin_unlock_irqrestore(&priv->lock, flags);
245 }
246
247 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
248                                            struct ipoib_cm_rx *p)
249 {
250         struct ipoib_dev_priv *priv = netdev_priv(dev);
251         struct ib_qp_init_attr attr = {
252                 .event_handler = ipoib_cm_rx_event_handler,
253                 .send_cq = priv->recv_cq, /* For drain WR */
254                 .recv_cq = priv->recv_cq,
255                 .srq = priv->cm.srq,
256                 .cap.max_send_wr = 1, /* For drain WR */
257                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
258                 .sq_sig_type = IB_SIGNAL_ALL_WR,
259                 .qp_type = IB_QPT_RC,
260                 .qp_context = p,
261         };
262
263         if (!ipoib_cm_has_srq(dev)) {
264                 attr.cap.max_recv_wr  = ipoib_recvq_size;
265                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
266         }
267
268         return ib_create_qp(priv->pd, &attr);
269 }
270
271 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
272                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
273                                  unsigned psn)
274 {
275         struct ipoib_dev_priv *priv = netdev_priv(dev);
276         struct ib_qp_attr qp_attr;
277         int qp_attr_mask, ret;
278
279         qp_attr.qp_state = IB_QPS_INIT;
280         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
281         if (ret) {
282                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
283                 return ret;
284         }
285         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
286         if (ret) {
287                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
288                 return ret;
289         }
290         qp_attr.qp_state = IB_QPS_RTR;
291         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
292         if (ret) {
293                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
294                 return ret;
295         }
296         qp_attr.rq_psn = psn;
297         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
298         if (ret) {
299                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
300                 return ret;
301         }
302
303         /*
304          * Current Mellanox HCA firmware won't generate completions
305          * with error for drain WRs unless the QP has been moved to
306          * RTS first. This work-around leaves a window where a QP has
307          * moved to error asynchronously, but this will eventually get
308          * fixed in firmware, so let's not error out if modify QP
309          * fails.
310          */
311         qp_attr.qp_state = IB_QPS_RTS;
312         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
313         if (ret) {
314                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
315                 return 0;
316         }
317         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
318         if (ret) {
319                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
320                 return 0;
321         }
322
323         return 0;
324 }
325
326 static void ipoib_cm_init_rx_wr(struct net_device *dev,
327                                 struct ib_recv_wr *wr,
328                                 struct ib_sge *sge)
329 {
330         struct ipoib_dev_priv *priv = netdev_priv(dev);
331         int i;
332
333         for (i = 0; i < priv->cm.num_frags; ++i)
334                 sge[i].lkey = priv->mr->lkey;
335
336         sge[0].length = IPOIB_CM_HEAD_SIZE;
337         for (i = 1; i < priv->cm.num_frags; ++i)
338                 sge[i].length = PAGE_SIZE;
339
340         wr->next    = NULL;
341         wr->sg_list = sge;
342         wr->num_sge = priv->cm.num_frags;
343 }
344
345 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
346                                    struct ipoib_cm_rx *rx)
347 {
348         struct ipoib_dev_priv *priv = netdev_priv(dev);
349         struct {
350                 struct ib_recv_wr wr;
351                 struct ib_sge sge[IPOIB_CM_RX_SG];
352         } *t;
353         int ret;
354         int i;
355
356         rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
357         if (!rx->rx_ring) {
358                 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
359                        priv->ca->name, ipoib_recvq_size);
360                 return -ENOMEM;
361         }
362
363         t = kmalloc(sizeof *t, GFP_KERNEL);
364         if (!t) {
365                 ret = -ENOMEM;
366                 goto err_free;
367         }
368
369         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
370
371         spin_lock_irq(&priv->lock);
372
373         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
374                 spin_unlock_irq(&priv->lock);
375                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
376                 ret = -EINVAL;
377                 goto err_free;
378         } else
379                 ++priv->cm.nonsrq_conn_qp;
380
381         spin_unlock_irq(&priv->lock);
382
383         for (i = 0; i < ipoib_recvq_size; ++i) {
384                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
385                                            rx->rx_ring[i].mapping)) {
386                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
387                                 ret = -ENOMEM;
388                                 goto err_count;
389                 }
390                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
391                 if (ret) {
392                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
393                                    "failed for buf %d\n", i);
394                         ret = -EIO;
395                         goto err_count;
396                 }
397         }
398
399         rx->recv_count = ipoib_recvq_size;
400
401         kfree(t);
402
403         return 0;
404
405 err_count:
406         spin_lock_irq(&priv->lock);
407         --priv->cm.nonsrq_conn_qp;
408         spin_unlock_irq(&priv->lock);
409
410 err_free:
411         kfree(t);
412         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
413
414         return ret;
415 }
416
417 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
418                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
419                              unsigned psn)
420 {
421         struct ipoib_dev_priv *priv = netdev_priv(dev);
422         struct ipoib_cm_data data = {};
423         struct ib_cm_rep_param rep = {};
424
425         data.qpn = cpu_to_be32(priv->qp->qp_num);
426         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
427
428         rep.private_data = &data;
429         rep.private_data_len = sizeof data;
430         rep.flow_control = 0;
431         rep.rnr_retry_count = req->rnr_retry_count;
432         rep.srq = ipoib_cm_has_srq(dev);
433         rep.qp_num = qp->qp_num;
434         rep.starting_psn = psn;
435         return ib_send_cm_rep(cm_id, &rep);
436 }
437
438 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
439 {
440         struct net_device *dev = cm_id->context;
441         struct ipoib_dev_priv *priv = netdev_priv(dev);
442         struct ipoib_cm_rx *p;
443         unsigned psn;
444         int ret;
445
446         ipoib_dbg(priv, "REQ arrived\n");
447         p = kzalloc(sizeof *p, GFP_KERNEL);
448         if (!p)
449                 return -ENOMEM;
450         p->dev = dev;
451         p->id = cm_id;
452         cm_id->context = p;
453         p->state = IPOIB_CM_RX_LIVE;
454         p->jiffies = jiffies;
455         INIT_LIST_HEAD(&p->list);
456
457         p->qp = ipoib_cm_create_rx_qp(dev, p);
458         if (IS_ERR(p->qp)) {
459                 ret = PTR_ERR(p->qp);
460                 goto err_qp;
461         }
462
463         psn = random32() & 0xffffff;
464         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
465         if (ret)
466                 goto err_modify;
467
468         if (!ipoib_cm_has_srq(dev)) {
469                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
470                 if (ret)
471                         goto err_modify;
472         }
473
474         spin_lock_irq(&priv->lock);
475         queue_delayed_work(ipoib_workqueue,
476                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
477         /* Add this entry to passive ids list head, but do not re-add it
478          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
479         p->jiffies = jiffies;
480         if (p->state == IPOIB_CM_RX_LIVE)
481                 list_move(&p->list, &priv->cm.passive_ids);
482         spin_unlock_irq(&priv->lock);
483
484         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
485         if (ret) {
486                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
487                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
488                         ipoib_warn(priv, "unable to move qp to error state\n");
489         }
490         return 0;
491
492 err_modify:
493         ib_destroy_qp(p->qp);
494 err_qp:
495         kfree(p);
496         return ret;
497 }
498
499 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
500                                struct ib_cm_event *event)
501 {
502         struct ipoib_cm_rx *p;
503         struct ipoib_dev_priv *priv;
504
505         switch (event->event) {
506         case IB_CM_REQ_RECEIVED:
507                 return ipoib_cm_req_handler(cm_id, event);
508         case IB_CM_DREQ_RECEIVED:
509                 p = cm_id->context;
510                 ib_send_cm_drep(cm_id, NULL, 0);
511                 /* Fall through */
512         case IB_CM_REJ_RECEIVED:
513                 p = cm_id->context;
514                 priv = netdev_priv(p->dev);
515                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
516                         ipoib_warn(priv, "unable to move qp to error state\n");
517                 /* Fall through */
518         default:
519                 return 0;
520         }
521 }
522 /* Adjust length of skb with fragments to match received data */
523 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
524                           unsigned int length, struct sk_buff *toskb)
525 {
526         int i, num_frags;
527         unsigned int size;
528
529         /* put header into skb */
530         size = min(length, hdr_space);
531         skb->tail += size;
532         skb->len += size;
533         length -= size;
534
535         num_frags = skb_shinfo(skb)->nr_frags;
536         for (i = 0; i < num_frags; i++) {
537                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
538
539                 if (length == 0) {
540                         /* don't need this page */
541                         skb_fill_page_desc(toskb, i, skb_frag_page(frag),
542                                            0, PAGE_SIZE);
543                         --skb_shinfo(skb)->nr_frags;
544                 } else {
545                         size = min(length, (unsigned) PAGE_SIZE);
546
547                         skb_frag_size_set(frag, size);
548                         skb->data_len += size;
549                         skb->truesize += size;
550                         skb->len += size;
551                         length -= size;
552                 }
553         }
554 }
555
556 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
557 {
558         struct ipoib_dev_priv *priv = netdev_priv(dev);
559         struct ipoib_cm_rx_buf *rx_ring;
560         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
561         struct sk_buff *skb, *newskb;
562         struct ipoib_cm_rx *p;
563         unsigned long flags;
564         u64 mapping[IPOIB_CM_RX_SG];
565         int frags;
566         int has_srq;
567         struct sk_buff *small_skb;
568
569         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
570                        wr_id, wc->status);
571
572         if (unlikely(wr_id >= ipoib_recvq_size)) {
573                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
574                         spin_lock_irqsave(&priv->lock, flags);
575                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
576                         ipoib_cm_start_rx_drain(priv);
577                         queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
578                         spin_unlock_irqrestore(&priv->lock, flags);
579                 } else
580                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
581                                    wr_id, ipoib_recvq_size);
582                 return;
583         }
584
585         p = wc->qp->qp_context;
586
587         has_srq = ipoib_cm_has_srq(dev);
588         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
589
590         skb = rx_ring[wr_id].skb;
591
592         if (unlikely(wc->status != IB_WC_SUCCESS)) {
593                 ipoib_dbg(priv, "cm recv error "
594                            "(status=%d, wrid=%d vend_err %x)\n",
595                            wc->status, wr_id, wc->vendor_err);
596                 ++dev->stats.rx_dropped;
597                 if (has_srq)
598                         goto repost;
599                 else {
600                         if (!--p->recv_count) {
601                                 spin_lock_irqsave(&priv->lock, flags);
602                                 list_move(&p->list, &priv->cm.rx_reap_list);
603                                 spin_unlock_irqrestore(&priv->lock, flags);
604                                 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
605                         }
606                         return;
607                 }
608         }
609
610         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
611                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
612                         spin_lock_irqsave(&priv->lock, flags);
613                         p->jiffies = jiffies;
614                         /* Move this entry to list head, but do not re-add it
615                          * if it has been moved out of list. */
616                         if (p->state == IPOIB_CM_RX_LIVE)
617                                 list_move(&p->list, &priv->cm.passive_ids);
618                         spin_unlock_irqrestore(&priv->lock, flags);
619                 }
620         }
621
622         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
623                 int dlen = wc->byte_len;
624
625                 small_skb = dev_alloc_skb(dlen + 12);
626                 if (small_skb) {
627                         skb_reserve(small_skb, 12);
628                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
629                                                    dlen, DMA_FROM_DEVICE);
630                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
631                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
632                                                       dlen, DMA_FROM_DEVICE);
633                         skb_put(small_skb, dlen);
634                         skb = small_skb;
635                         goto copied;
636                 }
637         }
638
639         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
640                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
641
642         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
643         if (unlikely(!newskb)) {
644                 /*
645                  * If we can't allocate a new RX buffer, dump
646                  * this packet and reuse the old buffer.
647                  */
648                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
649                 ++dev->stats.rx_dropped;
650                 goto repost;
651         }
652
653         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
654         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
655
656         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
657                        wc->byte_len, wc->slid);
658
659         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
660
661 copied:
662         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
663         skb_reset_mac_header(skb);
664         skb_pull(skb, IPOIB_ENCAP_LEN);
665
666         ++dev->stats.rx_packets;
667         dev->stats.rx_bytes += skb->len;
668
669         skb->dev = dev;
670         /* XXX get correct PACKET_ type here */
671         skb->pkt_type = PACKET_HOST;
672         netif_receive_skb(skb);
673
674 repost:
675         if (has_srq) {
676                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
677                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
678                                    "for buf %d\n", wr_id);
679         } else {
680                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
681                                                           &priv->cm.rx_wr,
682                                                           priv->cm.rx_sge,
683                                                           wr_id))) {
684                         --p->recv_count;
685                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
686                                    "for buf %d\n", wr_id);
687                 }
688         }
689 }
690
691 static inline int post_send(struct ipoib_dev_priv *priv,
692                             struct ipoib_cm_tx *tx,
693                             unsigned int wr_id,
694                             u64 addr, int len)
695 {
696         struct ib_send_wr *bad_wr;
697
698         priv->tx_sge[0].addr          = addr;
699         priv->tx_sge[0].length        = len;
700
701         priv->tx_wr.num_sge     = 1;
702         priv->tx_wr.wr_id       = wr_id | IPOIB_OP_CM;
703
704         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
705 }
706
707 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
708 {
709         struct ipoib_dev_priv *priv = netdev_priv(dev);
710         struct ipoib_cm_tx_buf *tx_req;
711         u64 addr;
712         int rc;
713
714         if (unlikely(skb->len > tx->mtu)) {
715                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
716                            skb->len, tx->mtu);
717                 ++dev->stats.tx_dropped;
718                 ++dev->stats.tx_errors;
719                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
720                 return;
721         }
722
723         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
724                        tx->tx_head, skb->len, tx->qp->qp_num);
725
726         /*
727          * We put the skb into the tx_ring _before_ we call post_send()
728          * because it's entirely possible that the completion handler will
729          * run before we execute anything after the post_send().  That
730          * means we have to make sure everything is properly recorded and
731          * our state is consistent before we call post_send().
732          */
733         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
734         tx_req->skb = skb;
735         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
736         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
737                 ++dev->stats.tx_errors;
738                 dev_kfree_skb_any(skb);
739                 return;
740         }
741
742         tx_req->mapping = addr;
743
744         rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
745                        addr, skb->len);
746         if (unlikely(rc)) {
747                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
748                 ++dev->stats.tx_errors;
749                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
750                 dev_kfree_skb_any(skb);
751         } else {
752                 dev->trans_start = jiffies;
753                 ++tx->tx_head;
754
755                 skb_orphan(skb);
756                 skb_dst_drop(skb);
757
758                 if (++priv->tx_outstanding == ipoib_sendq_size) {
759                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
760                                   tx->qp->qp_num);
761                         if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
762                                 ipoib_warn(priv, "request notify on send CQ failed\n");
763                         netif_stop_queue(dev);
764                 }
765         }
766 }
767
768 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
769 {
770         struct ipoib_dev_priv *priv = netdev_priv(dev);
771         struct ipoib_cm_tx *tx = wc->qp->qp_context;
772         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
773         struct ipoib_cm_tx_buf *tx_req;
774         unsigned long flags;
775
776         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
777                        wr_id, wc->status);
778
779         if (unlikely(wr_id >= ipoib_sendq_size)) {
780                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
781                            wr_id, ipoib_sendq_size);
782                 return;
783         }
784
785         tx_req = &tx->tx_ring[wr_id];
786
787         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
788
789         /* FIXME: is this right? Shouldn't we only increment on success? */
790         ++dev->stats.tx_packets;
791         dev->stats.tx_bytes += tx_req->skb->len;
792
793         dev_kfree_skb_any(tx_req->skb);
794
795         netif_tx_lock(dev);
796
797         ++tx->tx_tail;
798         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
799             netif_queue_stopped(dev) &&
800             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
801                 netif_wake_queue(dev);
802
803         if (wc->status != IB_WC_SUCCESS &&
804             wc->status != IB_WC_WR_FLUSH_ERR) {
805                 struct ipoib_neigh *neigh;
806
807                 ipoib_dbg(priv, "failed cm send event "
808                            "(status=%d, wrid=%d vend_err %x)\n",
809                            wc->status, wr_id, wc->vendor_err);
810
811                 spin_lock_irqsave(&priv->lock, flags);
812                 neigh = tx->neigh;
813
814                 if (neigh) {
815                         neigh->cm = NULL;
816                         list_del(&neigh->list);
817                         ipoib_neigh_free(neigh);
818
819                         tx->neigh = NULL;
820                 }
821
822                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
823                         list_move(&tx->list, &priv->cm.reap_list);
824                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
825                 }
826
827                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
828
829                 spin_unlock_irqrestore(&priv->lock, flags);
830         }
831
832         netif_tx_unlock(dev);
833 }
834
835 int ipoib_cm_dev_open(struct net_device *dev)
836 {
837         struct ipoib_dev_priv *priv = netdev_priv(dev);
838         int ret;
839
840         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
841                 return 0;
842
843         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
844         if (IS_ERR(priv->cm.id)) {
845                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
846                 ret = PTR_ERR(priv->cm.id);
847                 goto err_cm;
848         }
849
850         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
851                            0, NULL);
852         if (ret) {
853                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
854                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
855                 goto err_listen;
856         }
857
858         return 0;
859
860 err_listen:
861         ib_destroy_cm_id(priv->cm.id);
862 err_cm:
863         priv->cm.id = NULL;
864         return ret;
865 }
866
867 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
868 {
869         struct ipoib_dev_priv *priv = netdev_priv(dev);
870         struct ipoib_cm_rx *rx, *n;
871         LIST_HEAD(list);
872
873         spin_lock_irq(&priv->lock);
874         list_splice_init(&priv->cm.rx_reap_list, &list);
875         spin_unlock_irq(&priv->lock);
876
877         list_for_each_entry_safe(rx, n, &list, list) {
878                 ib_destroy_cm_id(rx->id);
879                 ib_destroy_qp(rx->qp);
880                 if (!ipoib_cm_has_srq(dev)) {
881                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
882                         spin_lock_irq(&priv->lock);
883                         --priv->cm.nonsrq_conn_qp;
884                         spin_unlock_irq(&priv->lock);
885                 }
886                 kfree(rx);
887         }
888 }
889
890 void ipoib_cm_dev_stop(struct net_device *dev)
891 {
892         struct ipoib_dev_priv *priv = netdev_priv(dev);
893         struct ipoib_cm_rx *p;
894         unsigned long begin;
895         int ret;
896
897         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
898                 return;
899
900         ib_destroy_cm_id(priv->cm.id);
901         priv->cm.id = NULL;
902
903         spin_lock_irq(&priv->lock);
904         while (!list_empty(&priv->cm.passive_ids)) {
905                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
906                 list_move(&p->list, &priv->cm.rx_error_list);
907                 p->state = IPOIB_CM_RX_ERROR;
908                 spin_unlock_irq(&priv->lock);
909                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
910                 if (ret)
911                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
912                 spin_lock_irq(&priv->lock);
913         }
914
915         /* Wait for all RX to be drained */
916         begin = jiffies;
917
918         while (!list_empty(&priv->cm.rx_error_list) ||
919                !list_empty(&priv->cm.rx_flush_list) ||
920                !list_empty(&priv->cm.rx_drain_list)) {
921                 if (time_after(jiffies, begin + 5 * HZ)) {
922                         ipoib_warn(priv, "RX drain timing out\n");
923
924                         /*
925                          * assume the HW is wedged and just free up everything.
926                          */
927                         list_splice_init(&priv->cm.rx_flush_list,
928                                          &priv->cm.rx_reap_list);
929                         list_splice_init(&priv->cm.rx_error_list,
930                                          &priv->cm.rx_reap_list);
931                         list_splice_init(&priv->cm.rx_drain_list,
932                                          &priv->cm.rx_reap_list);
933                         break;
934                 }
935                 spin_unlock_irq(&priv->lock);
936                 msleep(1);
937                 ipoib_drain_cq(dev);
938                 spin_lock_irq(&priv->lock);
939         }
940
941         spin_unlock_irq(&priv->lock);
942
943         ipoib_cm_free_rx_reap_list(dev);
944
945         cancel_delayed_work(&priv->cm.stale_task);
946 }
947
948 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
949 {
950         struct ipoib_cm_tx *p = cm_id->context;
951         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
952         struct ipoib_cm_data *data = event->private_data;
953         struct sk_buff_head skqueue;
954         struct ib_qp_attr qp_attr;
955         int qp_attr_mask, ret;
956         struct sk_buff *skb;
957
958         p->mtu = be32_to_cpu(data->mtu);
959
960         if (p->mtu <= IPOIB_ENCAP_LEN) {
961                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
962                            p->mtu, IPOIB_ENCAP_LEN);
963                 return -EINVAL;
964         }
965
966         qp_attr.qp_state = IB_QPS_RTR;
967         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
968         if (ret) {
969                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
970                 return ret;
971         }
972
973         qp_attr.rq_psn = 0 /* FIXME */;
974         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
975         if (ret) {
976                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
977                 return ret;
978         }
979
980         qp_attr.qp_state = IB_QPS_RTS;
981         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
982         if (ret) {
983                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
984                 return ret;
985         }
986         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
987         if (ret) {
988                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
989                 return ret;
990         }
991
992         skb_queue_head_init(&skqueue);
993
994         spin_lock_irq(&priv->lock);
995         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
996         if (p->neigh)
997                 while ((skb = __skb_dequeue(&p->neigh->queue)))
998                         __skb_queue_tail(&skqueue, skb);
999         spin_unlock_irq(&priv->lock);
1000
1001         while ((skb = __skb_dequeue(&skqueue))) {
1002                 skb->dev = p->dev;
1003                 if (dev_queue_xmit(skb))
1004                         ipoib_warn(priv, "dev_queue_xmit failed "
1005                                    "to requeue packet\n");
1006         }
1007
1008         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1009         if (ret) {
1010                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1011                 return ret;
1012         }
1013         return 0;
1014 }
1015
1016 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1017 {
1018         struct ipoib_dev_priv *priv = netdev_priv(dev);
1019         struct ib_qp_init_attr attr = {
1020                 .send_cq                = priv->recv_cq,
1021                 .recv_cq                = priv->recv_cq,
1022                 .srq                    = priv->cm.srq,
1023                 .cap.max_send_wr        = ipoib_sendq_size,
1024                 .cap.max_send_sge       = 1,
1025                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1026                 .qp_type                = IB_QPT_RC,
1027                 .qp_context             = tx
1028         };
1029
1030         return ib_create_qp(priv->pd, &attr);
1031 }
1032
1033 static int ipoib_cm_send_req(struct net_device *dev,
1034                              struct ib_cm_id *id, struct ib_qp *qp,
1035                              u32 qpn,
1036                              struct ib_sa_path_rec *pathrec)
1037 {
1038         struct ipoib_dev_priv *priv = netdev_priv(dev);
1039         struct ipoib_cm_data data = {};
1040         struct ib_cm_req_param req = {};
1041
1042         data.qpn = cpu_to_be32(priv->qp->qp_num);
1043         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1044
1045         req.primary_path                = pathrec;
1046         req.alternate_path              = NULL;
1047         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1048         req.qp_num                      = qp->qp_num;
1049         req.qp_type                     = qp->qp_type;
1050         req.private_data                = &data;
1051         req.private_data_len            = sizeof data;
1052         req.flow_control                = 0;
1053
1054         req.starting_psn                = 0; /* FIXME */
1055
1056         /*
1057          * Pick some arbitrary defaults here; we could make these
1058          * module parameters if anyone cared about setting them.
1059          */
1060         req.responder_resources         = 4;
1061         req.remote_cm_response_timeout  = 20;
1062         req.local_cm_response_timeout   = 20;
1063         req.retry_count                 = 0; /* RFC draft warns against retries */
1064         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1065         req.max_cm_retries              = 15;
1066         req.srq                         = ipoib_cm_has_srq(dev);
1067         return ib_send_cm_req(id, &req);
1068 }
1069
1070 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1071                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1072 {
1073         struct ipoib_dev_priv *priv = netdev_priv(dev);
1074         struct ib_qp_attr qp_attr;
1075         int qp_attr_mask, ret;
1076         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1077         if (ret) {
1078                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1079                 return ret;
1080         }
1081
1082         qp_attr.qp_state = IB_QPS_INIT;
1083         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1084         qp_attr.port_num = priv->port;
1085         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1086
1087         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1088         if (ret) {
1089                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1090                 return ret;
1091         }
1092         return 0;
1093 }
1094
1095 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1096                             struct ib_sa_path_rec *pathrec)
1097 {
1098         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1099         int ret;
1100
1101         p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1102         if (!p->tx_ring) {
1103                 ipoib_warn(priv, "failed to allocate tx ring\n");
1104                 ret = -ENOMEM;
1105                 goto err_tx;
1106         }
1107
1108         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1109         if (IS_ERR(p->qp)) {
1110                 ret = PTR_ERR(p->qp);
1111                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1112                 goto err_qp;
1113         }
1114
1115         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1116         if (IS_ERR(p->id)) {
1117                 ret = PTR_ERR(p->id);
1118                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1119                 goto err_id;
1120         }
1121
1122         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1123         if (ret) {
1124                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1125                 goto err_modify;
1126         }
1127
1128         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1129         if (ret) {
1130                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1131                 goto err_send_cm;
1132         }
1133
1134         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1135                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1136
1137         return 0;
1138
1139 err_send_cm:
1140 err_modify:
1141         ib_destroy_cm_id(p->id);
1142 err_id:
1143         p->id = NULL;
1144         ib_destroy_qp(p->qp);
1145 err_qp:
1146         p->qp = NULL;
1147         vfree(p->tx_ring);
1148 err_tx:
1149         return ret;
1150 }
1151
1152 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1153 {
1154         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1155         struct ipoib_cm_tx_buf *tx_req;
1156         unsigned long begin;
1157
1158         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1159                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1160
1161         if (p->id)
1162                 ib_destroy_cm_id(p->id);
1163
1164         if (p->tx_ring) {
1165                 /* Wait for all sends to complete */
1166                 begin = jiffies;
1167                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1168                         if (time_after(jiffies, begin + 5 * HZ)) {
1169                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1170                                            p->tx_head - p->tx_tail);
1171                                 goto timeout;
1172                         }
1173
1174                         msleep(1);
1175                 }
1176         }
1177
1178 timeout:
1179
1180         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1181                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1182                 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1183                                     DMA_TO_DEVICE);
1184                 dev_kfree_skb_any(tx_req->skb);
1185                 ++p->tx_tail;
1186                 netif_tx_lock_bh(p->dev);
1187                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1188                     netif_queue_stopped(p->dev) &&
1189                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1190                         netif_wake_queue(p->dev);
1191                 netif_tx_unlock_bh(p->dev);
1192         }
1193
1194         if (p->qp)
1195                 ib_destroy_qp(p->qp);
1196
1197         vfree(p->tx_ring);
1198         kfree(p);
1199 }
1200
1201 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1202                                struct ib_cm_event *event)
1203 {
1204         struct ipoib_cm_tx *tx = cm_id->context;
1205         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1206         struct net_device *dev = priv->dev;
1207         struct ipoib_neigh *neigh;
1208         unsigned long flags;
1209         int ret;
1210
1211         switch (event->event) {
1212         case IB_CM_DREQ_RECEIVED:
1213                 ipoib_dbg(priv, "DREQ received.\n");
1214                 ib_send_cm_drep(cm_id, NULL, 0);
1215                 break;
1216         case IB_CM_REP_RECEIVED:
1217                 ipoib_dbg(priv, "REP received.\n");
1218                 ret = ipoib_cm_rep_handler(cm_id, event);
1219                 if (ret)
1220                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1221                                        NULL, 0, NULL, 0);
1222                 break;
1223         case IB_CM_REQ_ERROR:
1224         case IB_CM_REJ_RECEIVED:
1225         case IB_CM_TIMEWAIT_EXIT:
1226                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1227                 netif_tx_lock_bh(dev);
1228                 spin_lock_irqsave(&priv->lock, flags);
1229                 neigh = tx->neigh;
1230
1231                 if (neigh) {
1232                         neigh->cm = NULL;
1233                         list_del(&neigh->list);
1234                         ipoib_neigh_free(neigh);
1235
1236                         tx->neigh = NULL;
1237                 }
1238
1239                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1240                         list_move(&tx->list, &priv->cm.reap_list);
1241                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1242                 }
1243
1244                 spin_unlock_irqrestore(&priv->lock, flags);
1245                 netif_tx_unlock_bh(dev);
1246                 break;
1247         default:
1248                 break;
1249         }
1250
1251         return 0;
1252 }
1253
1254 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1255                                        struct ipoib_neigh *neigh)
1256 {
1257         struct ipoib_dev_priv *priv = netdev_priv(dev);
1258         struct ipoib_cm_tx *tx;
1259
1260         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1261         if (!tx)
1262                 return NULL;
1263
1264         neigh->cm = tx;
1265         tx->neigh = neigh;
1266         tx->path = path;
1267         tx->dev = dev;
1268         list_add(&tx->list, &priv->cm.start_list);
1269         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1270         queue_work(ipoib_workqueue, &priv->cm.start_task);
1271         return tx;
1272 }
1273
1274 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1275 {
1276         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1277         unsigned long flags;
1278         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1279                 spin_lock_irqsave(&priv->lock, flags);
1280                 list_move(&tx->list, &priv->cm.reap_list);
1281                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1282                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1283                           tx->neigh->daddr + 4);
1284                 tx->neigh = NULL;
1285                 spin_unlock_irqrestore(&priv->lock, flags);
1286         }
1287 }
1288
1289 static void ipoib_cm_tx_start(struct work_struct *work)
1290 {
1291         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1292                                                    cm.start_task);
1293         struct net_device *dev = priv->dev;
1294         struct ipoib_neigh *neigh;
1295         struct ipoib_cm_tx *p;
1296         unsigned long flags;
1297         int ret;
1298
1299         struct ib_sa_path_rec pathrec;
1300         u32 qpn;
1301
1302         netif_tx_lock_bh(dev);
1303         spin_lock_irqsave(&priv->lock, flags);
1304
1305         while (!list_empty(&priv->cm.start_list)) {
1306                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1307                 list_del_init(&p->list);
1308                 neigh = p->neigh;
1309                 qpn = IPOIB_QPN(neigh->daddr);
1310                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1311
1312                 spin_unlock_irqrestore(&priv->lock, flags);
1313                 netif_tx_unlock_bh(dev);
1314
1315                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1316
1317                 netif_tx_lock_bh(dev);
1318                 spin_lock_irqsave(&priv->lock, flags);
1319
1320                 if (ret) {
1321                         neigh = p->neigh;
1322                         if (neigh) {
1323                                 neigh->cm = NULL;
1324                                 list_del(&neigh->list);
1325                                 ipoib_neigh_free(neigh);
1326                         }
1327                         list_del(&p->list);
1328                         kfree(p);
1329                 }
1330         }
1331
1332         spin_unlock_irqrestore(&priv->lock, flags);
1333         netif_tx_unlock_bh(dev);
1334 }
1335
1336 static void ipoib_cm_tx_reap(struct work_struct *work)
1337 {
1338         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1339                                                    cm.reap_task);
1340         struct net_device *dev = priv->dev;
1341         struct ipoib_cm_tx *p;
1342         unsigned long flags;
1343
1344         netif_tx_lock_bh(dev);
1345         spin_lock_irqsave(&priv->lock, flags);
1346
1347         while (!list_empty(&priv->cm.reap_list)) {
1348                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1349                 list_del(&p->list);
1350                 spin_unlock_irqrestore(&priv->lock, flags);
1351                 netif_tx_unlock_bh(dev);
1352                 ipoib_cm_tx_destroy(p);
1353                 netif_tx_lock_bh(dev);
1354                 spin_lock_irqsave(&priv->lock, flags);
1355         }
1356
1357         spin_unlock_irqrestore(&priv->lock, flags);
1358         netif_tx_unlock_bh(dev);
1359 }
1360
1361 static void ipoib_cm_skb_reap(struct work_struct *work)
1362 {
1363         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1364                                                    cm.skb_task);
1365         struct net_device *dev = priv->dev;
1366         struct sk_buff *skb;
1367         unsigned long flags;
1368         unsigned mtu = priv->mcast_mtu;
1369
1370         netif_tx_lock_bh(dev);
1371         spin_lock_irqsave(&priv->lock, flags);
1372
1373         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1374                 spin_unlock_irqrestore(&priv->lock, flags);
1375                 netif_tx_unlock_bh(dev);
1376
1377                 if (skb->protocol == htons(ETH_P_IP))
1378                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1379 #if IS_ENABLED(CONFIG_IPV6)
1380                 else if (skb->protocol == htons(ETH_P_IPV6))
1381                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1382 #endif
1383                 dev_kfree_skb_any(skb);
1384
1385                 netif_tx_lock_bh(dev);
1386                 spin_lock_irqsave(&priv->lock, flags);
1387         }
1388
1389         spin_unlock_irqrestore(&priv->lock, flags);
1390         netif_tx_unlock_bh(dev);
1391 }
1392
1393 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1394                            unsigned int mtu)
1395 {
1396         struct ipoib_dev_priv *priv = netdev_priv(dev);
1397         int e = skb_queue_empty(&priv->cm.skb_queue);
1398
1399         if (skb_dst(skb))
1400                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1401
1402         skb_queue_tail(&priv->cm.skb_queue, skb);
1403         if (e)
1404                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1405 }
1406
1407 static void ipoib_cm_rx_reap(struct work_struct *work)
1408 {
1409         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1410                                                 cm.rx_reap_task)->dev);
1411 }
1412
1413 static void ipoib_cm_stale_task(struct work_struct *work)
1414 {
1415         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1416                                                    cm.stale_task.work);
1417         struct ipoib_cm_rx *p;
1418         int ret;
1419
1420         spin_lock_irq(&priv->lock);
1421         while (!list_empty(&priv->cm.passive_ids)) {
1422                 /* List is sorted by LRU, start from tail,
1423                  * stop when we see a recently used entry */
1424                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1425                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1426                         break;
1427                 list_move(&p->list, &priv->cm.rx_error_list);
1428                 p->state = IPOIB_CM_RX_ERROR;
1429                 spin_unlock_irq(&priv->lock);
1430                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1431                 if (ret)
1432                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1433                 spin_lock_irq(&priv->lock);
1434         }
1435
1436         if (!list_empty(&priv->cm.passive_ids))
1437                 queue_delayed_work(ipoib_workqueue,
1438                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1439         spin_unlock_irq(&priv->lock);
1440 }
1441
1442
1443 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1444                          char *buf)
1445 {
1446         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1447
1448         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1449                 return sprintf(buf, "connected\n");
1450         else
1451                 return sprintf(buf, "datagram\n");
1452 }
1453
1454 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1455                         const char *buf, size_t count)
1456 {
1457         struct net_device *dev = to_net_dev(d);
1458         int ret;
1459
1460         if (!rtnl_trylock())
1461                 return restart_syscall();
1462
1463         ret = ipoib_set_mode(dev, buf);
1464
1465         rtnl_unlock();
1466
1467         if (!ret)
1468                 return count;
1469
1470         return ret;
1471 }
1472
1473 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1474
1475 int ipoib_cm_add_mode_attr(struct net_device *dev)
1476 {
1477         return device_create_file(&dev->dev, &dev_attr_mode);
1478 }
1479
1480 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1481 {
1482         struct ipoib_dev_priv *priv = netdev_priv(dev);
1483         struct ib_srq_init_attr srq_init_attr = {
1484                 .srq_type = IB_SRQT_BASIC,
1485                 .attr = {
1486                         .max_wr  = ipoib_recvq_size,
1487                         .max_sge = max_sge
1488                 }
1489         };
1490
1491         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1492         if (IS_ERR(priv->cm.srq)) {
1493                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1494                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1495                                priv->ca->name, PTR_ERR(priv->cm.srq));
1496                 priv->cm.srq = NULL;
1497                 return;
1498         }
1499
1500         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1501         if (!priv->cm.srq_ring) {
1502                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1503                        priv->ca->name, ipoib_recvq_size);
1504                 ib_destroy_srq(priv->cm.srq);
1505                 priv->cm.srq = NULL;
1506                 return;
1507         }
1508
1509 }
1510
1511 int ipoib_cm_dev_init(struct net_device *dev)
1512 {
1513         struct ipoib_dev_priv *priv = netdev_priv(dev);
1514         int i, ret;
1515         struct ib_device_attr attr;
1516
1517         INIT_LIST_HEAD(&priv->cm.passive_ids);
1518         INIT_LIST_HEAD(&priv->cm.reap_list);
1519         INIT_LIST_HEAD(&priv->cm.start_list);
1520         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1521         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1522         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1523         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1524         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1525         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1526         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1527         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1528         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1529
1530         skb_queue_head_init(&priv->cm.skb_queue);
1531
1532         ret = ib_query_device(priv->ca, &attr);
1533         if (ret) {
1534                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1535                 return ret;
1536         }
1537
1538         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1539
1540         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1541         ipoib_cm_create_srq(dev, attr.max_srq_sge);
1542         if (ipoib_cm_has_srq(dev)) {
1543                 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1544                 priv->cm.num_frags  = attr.max_srq_sge;
1545                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1546                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1547         } else {
1548                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1549                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1550         }
1551
1552         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1553
1554         if (ipoib_cm_has_srq(dev)) {
1555                 for (i = 0; i < ipoib_recvq_size; ++i) {
1556                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1557                                                    priv->cm.num_frags - 1,
1558                                                    priv->cm.srq_ring[i].mapping)) {
1559                                 ipoib_warn(priv, "failed to allocate "
1560                                            "receive buffer %d\n", i);
1561                                 ipoib_cm_dev_cleanup(dev);
1562                                 return -ENOMEM;
1563                         }
1564
1565                         if (ipoib_cm_post_receive_srq(dev, i)) {
1566                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1567                                            "failed for buf %d\n", i);
1568                                 ipoib_cm_dev_cleanup(dev);
1569                                 return -EIO;
1570                         }
1571                 }
1572         }
1573
1574         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1575         return 0;
1576 }
1577
1578 void ipoib_cm_dev_cleanup(struct net_device *dev)
1579 {
1580         struct ipoib_dev_priv *priv = netdev_priv(dev);
1581         int ret;
1582
1583         if (!priv->cm.srq)
1584                 return;
1585
1586         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1587
1588         ret = ib_destroy_srq(priv->cm.srq);
1589         if (ret)
1590                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1591
1592         priv->cm.srq = NULL;
1593         if (!priv->cm.srq_ring)
1594                 return;
1595
1596         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1597         priv->cm.srq_ring = NULL;
1598 }