2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <rdma/ib_cm.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
41 #include <linux/sched/signal.h>
42 #include <linux/sched/mm.h>
46 int ipoib_max_conn_qp = 128;
48 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
49 MODULE_PARM_DESC(max_nonsrq_conn_qp,
50 "Max number of connected-mode QPs per interface "
51 "(applied only if shared receive queue is not available)");
53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
54 static int data_debug_level;
56 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
57 MODULE_PARM_DESC(cm_data_debug_level,
58 "Enable data path debug tracing for connected mode if > 0");
61 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
63 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
64 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
65 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
66 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
68 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
70 static struct ib_qp_attr ipoib_cm_err_attr = {
71 .qp_state = IB_QPS_ERR
74 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
76 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
80 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
81 struct ib_cm_event *event);
83 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
84 u64 mapping[IPOIB_CM_RX_SG])
88 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
90 for (i = 0; i < frags; ++i)
91 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
94 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
96 struct ipoib_dev_priv *priv = ipoib_priv(dev);
97 struct ib_recv_wr *bad_wr;
100 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
102 for (i = 0; i < priv->cm.num_frags; ++i)
103 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
108 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
109 priv->cm.srq_ring[id].mapping);
110 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
111 priv->cm.srq_ring[id].skb = NULL;
117 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
118 struct ipoib_cm_rx *rx,
119 struct ib_recv_wr *wr,
120 struct ib_sge *sge, int id)
122 struct ipoib_dev_priv *priv = ipoib_priv(dev);
123 struct ib_recv_wr *bad_wr;
126 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
128 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
129 sge[i].addr = rx->rx_ring[id].mapping[i];
131 ret = ib_post_recv(rx->qp, wr, &bad_wr);
133 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
134 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
135 rx->rx_ring[id].mapping);
136 dev_kfree_skb_any(rx->rx_ring[id].skb);
137 rx->rx_ring[id].skb = NULL;
143 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
144 struct ipoib_cm_rx_buf *rx_ring,
146 u64 mapping[IPOIB_CM_RX_SG],
149 struct ipoib_dev_priv *priv = ipoib_priv(dev);
153 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
158 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
159 * IP header to a multiple of 16.
161 skb_reserve(skb, IPOIB_CM_RX_RESERVE);
163 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
165 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
166 dev_kfree_skb_any(skb);
170 for (i = 0; i < frags; i++) {
171 struct page *page = alloc_page(gfp);
175 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
177 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
178 0, PAGE_SIZE, DMA_FROM_DEVICE);
179 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
183 rx_ring[id].skb = skb;
188 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
191 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
193 dev_kfree_skb_any(skb);
197 static void ipoib_cm_free_rx_ring(struct net_device *dev,
198 struct ipoib_cm_rx_buf *rx_ring)
200 struct ipoib_dev_priv *priv = ipoib_priv(dev);
203 for (i = 0; i < ipoib_recvq_size; ++i)
204 if (rx_ring[i].skb) {
205 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
207 dev_kfree_skb_any(rx_ring[i].skb);
213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
215 struct ib_send_wr *bad_wr;
216 struct ipoib_cm_rx *p;
218 /* We only reserved 1 extra slot in CQ for drain WRs, so
219 * make sure we have at most 1 outstanding WR. */
220 if (list_empty(&priv->cm.rx_flush_list) ||
221 !list_empty(&priv->cm.rx_drain_list))
225 * QPs on flush list are error state. This way, a "flush
226 * error" WC will be immediately generated for each WR we post.
228 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
229 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
230 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
231 ipoib_warn(priv, "failed to post drain wr\n");
233 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
236 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
238 struct ipoib_cm_rx *p = ctx;
239 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
242 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
245 spin_lock_irqsave(&priv->lock, flags);
246 list_move(&p->list, &priv->cm.rx_flush_list);
247 p->state = IPOIB_CM_RX_FLUSH;
248 ipoib_cm_start_rx_drain(priv);
249 spin_unlock_irqrestore(&priv->lock, flags);
252 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
253 struct ipoib_cm_rx *p)
255 struct ipoib_dev_priv *priv = ipoib_priv(dev);
256 struct ib_qp_init_attr attr = {
257 .event_handler = ipoib_cm_rx_event_handler,
258 .send_cq = priv->recv_cq, /* For drain WR */
259 .recv_cq = priv->recv_cq,
261 .cap.max_send_wr = 1, /* For drain WR */
262 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
263 .sq_sig_type = IB_SIGNAL_ALL_WR,
264 .qp_type = IB_QPT_RC,
268 if (!ipoib_cm_has_srq(dev)) {
269 attr.cap.max_recv_wr = ipoib_recvq_size;
270 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
273 return ib_create_qp(priv->pd, &attr);
276 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
277 struct ib_cm_id *cm_id, struct ib_qp *qp,
280 struct ipoib_dev_priv *priv = ipoib_priv(dev);
281 struct ib_qp_attr qp_attr;
282 int qp_attr_mask, ret;
284 qp_attr.qp_state = IB_QPS_INIT;
285 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
287 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
290 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
292 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
295 qp_attr.qp_state = IB_QPS_RTR;
296 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
298 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
301 qp_attr.rq_psn = psn;
302 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
304 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
309 * Current Mellanox HCA firmware won't generate completions
310 * with error for drain WRs unless the QP has been moved to
311 * RTS first. This work-around leaves a window where a QP has
312 * moved to error asynchronously, but this will eventually get
313 * fixed in firmware, so let's not error out if modify QP
316 qp_attr.qp_state = IB_QPS_RTS;
317 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
319 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
322 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
324 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
331 static void ipoib_cm_init_rx_wr(struct net_device *dev,
332 struct ib_recv_wr *wr,
335 struct ipoib_dev_priv *priv = ipoib_priv(dev);
338 for (i = 0; i < priv->cm.num_frags; ++i)
339 sge[i].lkey = priv->pd->local_dma_lkey;
341 sge[0].length = IPOIB_CM_HEAD_SIZE;
342 for (i = 1; i < priv->cm.num_frags; ++i)
343 sge[i].length = PAGE_SIZE;
347 wr->num_sge = priv->cm.num_frags;
350 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
351 struct ipoib_cm_rx *rx)
353 struct ipoib_dev_priv *priv = ipoib_priv(dev);
355 struct ib_recv_wr wr;
356 struct ib_sge sge[IPOIB_CM_RX_SG];
361 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
365 t = kmalloc(sizeof *t, GFP_KERNEL);
371 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
373 spin_lock_irq(&priv->lock);
375 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
376 spin_unlock_irq(&priv->lock);
377 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
381 ++priv->cm.nonsrq_conn_qp;
383 spin_unlock_irq(&priv->lock);
385 for (i = 0; i < ipoib_recvq_size; ++i) {
386 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
387 rx->rx_ring[i].mapping,
389 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
393 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
395 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
396 "failed for buf %d\n", i);
402 rx->recv_count = ipoib_recvq_size;
409 spin_lock_irq(&priv->lock);
410 --priv->cm.nonsrq_conn_qp;
411 spin_unlock_irq(&priv->lock);
417 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
422 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
423 struct ib_qp *qp, struct ib_cm_req_event_param *req,
426 struct ipoib_dev_priv *priv = ipoib_priv(dev);
427 struct ipoib_cm_data data = {};
428 struct ib_cm_rep_param rep = {};
430 data.qpn = cpu_to_be32(priv->qp->qp_num);
431 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
433 rep.private_data = &data;
434 rep.private_data_len = sizeof data;
435 rep.flow_control = 0;
436 rep.rnr_retry_count = req->rnr_retry_count;
437 rep.srq = ipoib_cm_has_srq(dev);
438 rep.qp_num = qp->qp_num;
439 rep.starting_psn = psn;
440 return ib_send_cm_rep(cm_id, &rep);
443 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
445 struct net_device *dev = cm_id->context;
446 struct ipoib_dev_priv *priv = ipoib_priv(dev);
447 struct ipoib_cm_rx *p;
451 ipoib_dbg(priv, "REQ arrived\n");
452 p = kzalloc(sizeof *p, GFP_KERNEL);
458 p->state = IPOIB_CM_RX_LIVE;
459 p->jiffies = jiffies;
460 INIT_LIST_HEAD(&p->list);
462 p->qp = ipoib_cm_create_rx_qp(dev, p);
464 ret = PTR_ERR(p->qp);
468 psn = prandom_u32() & 0xffffff;
469 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
473 if (!ipoib_cm_has_srq(dev)) {
474 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
479 spin_lock_irq(&priv->lock);
480 queue_delayed_work(priv->wq,
481 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
482 /* Add this entry to passive ids list head, but do not re-add it
483 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
484 p->jiffies = jiffies;
485 if (p->state == IPOIB_CM_RX_LIVE)
486 list_move(&p->list, &priv->cm.passive_ids);
487 spin_unlock_irq(&priv->lock);
489 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
491 ipoib_warn(priv, "failed to send REP: %d\n", ret);
492 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
493 ipoib_warn(priv, "unable to move qp to error state\n");
498 ib_destroy_qp(p->qp);
504 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
505 struct ib_cm_event *event)
507 struct ipoib_cm_rx *p;
508 struct ipoib_dev_priv *priv;
510 switch (event->event) {
511 case IB_CM_REQ_RECEIVED:
512 return ipoib_cm_req_handler(cm_id, event);
513 case IB_CM_DREQ_RECEIVED:
514 ib_send_cm_drep(cm_id, NULL, 0);
516 case IB_CM_REJ_RECEIVED:
518 priv = ipoib_priv(p->dev);
519 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
520 ipoib_warn(priv, "unable to move qp to error state\n");
526 /* Adjust length of skb with fragments to match received data */
527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
528 unsigned int length, struct sk_buff *toskb)
533 /* put header into skb */
534 size = min(length, hdr_space);
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];
544 /* don't need this page */
545 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
547 --skb_shinfo(skb)->nr_frags;
549 size = min(length, (unsigned) PAGE_SIZE);
551 skb_frag_size_set(frag, size);
552 skb->data_len += size;
553 skb->truesize += size;
560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
562 struct ipoib_dev_priv *priv = ipoib_priv(dev);
563 struct ipoib_cm_rx_buf *rx_ring;
564 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
565 struct sk_buff *skb, *newskb;
566 struct ipoib_cm_rx *p;
568 u64 mapping[IPOIB_CM_RX_SG];
571 struct sk_buff *small_skb;
573 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
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);
584 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
585 wr_id, ipoib_recvq_size);
589 p = wc->qp->qp_context;
591 has_srq = ipoib_cm_has_srq(dev);
592 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
594 skb = rx_ring[wr_id].skb;
596 if (unlikely(wc->status != IB_WC_SUCCESS)) {
598 "cm recv error (status=%d, wrid=%d vend_err %#x)\n",
599 wc->status, wr_id, wc->vendor_err);
600 ++dev->stats.rx_dropped;
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);
614 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
615 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
616 spin_lock_irqsave(&priv->lock, flags);
617 p->jiffies = jiffies;
618 /* Move this entry to list head, but do not re-add it
619 * if it has been moved out of list. */
620 if (p->state == IPOIB_CM_RX_LIVE)
621 list_move(&p->list, &priv->cm.passive_ids);
622 spin_unlock_irqrestore(&priv->lock, flags);
626 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
627 int dlen = wc->byte_len;
629 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
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);
643 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
644 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
646 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
647 mapping, GFP_ATOMIC);
648 if (unlikely(!newskb)) {
650 * If we can't allocate a new RX buffer, dump
651 * this packet and reuse the old buffer.
653 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
654 ++dev->stats.rx_dropped;
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);
661 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
662 wc->byte_len, wc->slid);
664 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
667 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
668 skb_add_pseudo_hdr(skb);
670 ++dev->stats.rx_packets;
671 dev->stats.rx_bytes += skb->len;
674 /* XXX get correct PACKET_ type here */
675 skb->pkt_type = PACKET_HOST;
676 netif_receive_skb(skb);
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);
684 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
689 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
690 "for buf %d\n", wr_id);
695 static inline int post_send(struct ipoib_dev_priv *priv,
696 struct ipoib_cm_tx *tx,
698 struct ipoib_tx_buf *tx_req)
700 struct ib_send_wr *bad_wr;
702 ipoib_build_sge(priv, tx_req);
704 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
706 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
711 struct ipoib_dev_priv *priv = ipoib_priv(dev);
712 struct ipoib_tx_buf *tx_req;
714 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
716 if (unlikely(skb->len > tx->mtu)) {
717 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
719 ++dev->stats.tx_dropped;
720 ++dev->stats.tx_errors;
721 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
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);
732 /* Does skb_linearize return ok without reducing nr_frags? */
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);
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);
745 * We put the skb into the tx_ring _before_ we call post_send()
746 * because it's entirely possible that the completion handler will
747 * run before we execute anything after the post_send(). That
748 * means we have to make sure everything is properly recorded and
749 * our state is consistent before we call post_send().
751 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
754 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
755 ++dev->stats.tx_errors;
756 dev_kfree_skb_any(skb);
760 if ((priv->tx_head - priv->tx_tail) == ipoib_sendq_size - 1) {
761 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
763 netif_stop_queue(dev);
769 if (netif_queue_stopped(dev))
770 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
771 IB_CQ_REPORT_MISSED_EVENTS)) {
772 ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
773 napi_schedule(&priv->send_napi);
776 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
778 ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
779 ++dev->stats.tx_errors;
780 ipoib_dma_unmap_tx(priv, tx_req);
781 dev_kfree_skb_any(skb);
783 if (netif_queue_stopped(dev))
784 netif_wake_queue(dev);
786 netif_trans_update(dev);
792 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
794 struct ipoib_dev_priv *priv = ipoib_priv(dev);
795 struct ipoib_cm_tx *tx = wc->qp->qp_context;
796 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
797 struct ipoib_tx_buf *tx_req;
800 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
803 if (unlikely(wr_id >= ipoib_sendq_size)) {
804 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
805 wr_id, ipoib_sendq_size);
809 tx_req = &tx->tx_ring[wr_id];
811 ipoib_dma_unmap_tx(priv, tx_req);
813 /* FIXME: is this right? Shouldn't we only increment on success? */
814 ++dev->stats.tx_packets;
815 dev->stats.tx_bytes += tx_req->skb->len;
817 dev_kfree_skb_any(tx_req->skb);
824 if (unlikely(netif_queue_stopped(dev) &&
825 (priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1 &&
826 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
827 netif_wake_queue(dev);
829 if (wc->status != IB_WC_SUCCESS &&
830 wc->status != IB_WC_WR_FLUSH_ERR) {
831 struct ipoib_neigh *neigh;
833 /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
834 * so don't make waves.
836 if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
837 wc->status == IB_WC_RETRY_EXC_ERR)
839 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
840 __func__, wc->status, wr_id, wc->vendor_err);
843 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
844 __func__, wc->status, wr_id, wc->vendor_err);
846 spin_lock_irqsave(&priv->lock, flags);
851 ipoib_neigh_free(neigh);
856 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
857 list_move(&tx->list, &priv->cm.reap_list);
858 queue_work(priv->wq, &priv->cm.reap_task);
861 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
863 spin_unlock_irqrestore(&priv->lock, flags);
866 netif_tx_unlock(dev);
869 int ipoib_cm_dev_open(struct net_device *dev)
871 struct ipoib_dev_priv *priv = ipoib_priv(dev);
874 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
877 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
878 if (IS_ERR(priv->cm.id)) {
879 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
880 ret = PTR_ERR(priv->cm.id);
884 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
887 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
888 IPOIB_CM_IETF_ID | priv->qp->qp_num);
895 ib_destroy_cm_id(priv->cm.id);
901 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
903 struct ipoib_dev_priv *priv = ipoib_priv(dev);
904 struct ipoib_cm_rx *rx, *n;
907 spin_lock_irq(&priv->lock);
908 list_splice_init(&priv->cm.rx_reap_list, &list);
909 spin_unlock_irq(&priv->lock);
911 list_for_each_entry_safe(rx, n, &list, list) {
912 ib_destroy_cm_id(rx->id);
913 ib_destroy_qp(rx->qp);
914 if (!ipoib_cm_has_srq(dev)) {
915 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
916 spin_lock_irq(&priv->lock);
917 --priv->cm.nonsrq_conn_qp;
918 spin_unlock_irq(&priv->lock);
924 void ipoib_cm_dev_stop(struct net_device *dev)
926 struct ipoib_dev_priv *priv = ipoib_priv(dev);
927 struct ipoib_cm_rx *p;
931 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
934 ib_destroy_cm_id(priv->cm.id);
937 spin_lock_irq(&priv->lock);
938 while (!list_empty(&priv->cm.passive_ids)) {
939 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
940 list_move(&p->list, &priv->cm.rx_error_list);
941 p->state = IPOIB_CM_RX_ERROR;
942 spin_unlock_irq(&priv->lock);
943 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
945 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
946 spin_lock_irq(&priv->lock);
949 /* Wait for all RX to be drained */
952 while (!list_empty(&priv->cm.rx_error_list) ||
953 !list_empty(&priv->cm.rx_flush_list) ||
954 !list_empty(&priv->cm.rx_drain_list)) {
955 if (time_after(jiffies, begin + 5 * HZ)) {
956 ipoib_warn(priv, "RX drain timing out\n");
959 * assume the HW is wedged and just free up everything.
961 list_splice_init(&priv->cm.rx_flush_list,
962 &priv->cm.rx_reap_list);
963 list_splice_init(&priv->cm.rx_error_list,
964 &priv->cm.rx_reap_list);
965 list_splice_init(&priv->cm.rx_drain_list,
966 &priv->cm.rx_reap_list);
969 spin_unlock_irq(&priv->lock);
970 usleep_range(1000, 2000);
972 spin_lock_irq(&priv->lock);
975 spin_unlock_irq(&priv->lock);
977 ipoib_cm_free_rx_reap_list(dev);
979 cancel_delayed_work(&priv->cm.stale_task);
982 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
984 struct ipoib_cm_tx *p = cm_id->context;
985 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
986 struct ipoib_cm_data *data = event->private_data;
987 struct sk_buff_head skqueue;
988 struct ib_qp_attr qp_attr;
989 int qp_attr_mask, ret;
992 p->mtu = be32_to_cpu(data->mtu);
994 if (p->mtu <= IPOIB_ENCAP_LEN) {
995 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
996 p->mtu, IPOIB_ENCAP_LEN);
1000 qp_attr.qp_state = IB_QPS_RTR;
1001 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1003 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
1007 qp_attr.rq_psn = 0 /* FIXME */;
1008 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1010 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1014 qp_attr.qp_state = IB_QPS_RTS;
1015 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1017 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1020 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1022 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1026 skb_queue_head_init(&skqueue);
1028 spin_lock_irq(&priv->lock);
1029 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1031 while ((skb = __skb_dequeue(&p->neigh->queue)))
1032 __skb_queue_tail(&skqueue, skb);
1033 spin_unlock_irq(&priv->lock);
1035 while ((skb = __skb_dequeue(&skqueue))) {
1037 ret = dev_queue_xmit(skb);
1039 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1043 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1045 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1051 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1053 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1054 struct ib_qp_init_attr attr = {
1055 .send_cq = priv->send_cq,
1056 .recv_cq = priv->recv_cq,
1057 .srq = priv->cm.srq,
1058 .cap.max_send_wr = ipoib_sendq_size,
1059 .cap.max_send_sge = 1,
1060 .sq_sig_type = IB_SIGNAL_ALL_WR,
1061 .qp_type = IB_QPT_RC,
1065 struct ib_qp *tx_qp;
1067 if (dev->features & NETIF_F_SG)
1068 attr.cap.max_send_sge =
1069 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1071 tx_qp = ib_create_qp(priv->pd, &attr);
1072 tx->max_send_sge = attr.cap.max_send_sge;
1076 static int ipoib_cm_send_req(struct net_device *dev,
1077 struct ib_cm_id *id, struct ib_qp *qp,
1079 struct sa_path_rec *pathrec)
1081 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1082 struct ipoib_cm_data data = {};
1083 struct ib_cm_req_param req = {};
1085 data.qpn = cpu_to_be32(priv->qp->qp_num);
1086 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1088 req.primary_path = pathrec;
1089 req.alternate_path = NULL;
1090 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1091 req.qp_num = qp->qp_num;
1092 req.qp_type = qp->qp_type;
1093 req.private_data = &data;
1094 req.private_data_len = sizeof data;
1095 req.flow_control = 0;
1097 req.starting_psn = 0; /* FIXME */
1100 * Pick some arbitrary defaults here; we could make these
1101 * module parameters if anyone cared about setting them.
1103 req.responder_resources = 4;
1104 req.remote_cm_response_timeout = 20;
1105 req.local_cm_response_timeout = 20;
1106 req.retry_count = 0; /* RFC draft warns against retries */
1107 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1108 req.max_cm_retries = 15;
1109 req.srq = ipoib_cm_has_srq(dev);
1110 return ib_send_cm_req(id, &req);
1113 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1114 struct ib_cm_id *cm_id, struct ib_qp *qp)
1116 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1117 struct ib_qp_attr qp_attr;
1118 int qp_attr_mask, ret;
1119 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1121 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1125 qp_attr.qp_state = IB_QPS_INIT;
1126 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1127 qp_attr.port_num = priv->port;
1128 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1130 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1132 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1138 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1139 struct sa_path_rec *pathrec)
1141 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1142 unsigned int noio_flag;
1145 noio_flag = memalloc_noio_save();
1146 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring));
1151 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1153 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1154 memalloc_noio_restore(noio_flag);
1155 if (IS_ERR(p->qp)) {
1156 ret = PTR_ERR(p->qp);
1157 ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1161 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1162 if (IS_ERR(p->id)) {
1163 ret = PTR_ERR(p->id);
1164 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1168 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1170 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1171 goto err_modify_send;
1174 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1176 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1177 goto err_modify_send;
1180 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1181 p->qp->qp_num, pathrec->dgid.raw, qpn);
1186 ib_destroy_cm_id(p->id);
1189 ib_destroy_qp(p->qp);
1197 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1199 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1200 struct ipoib_tx_buf *tx_req;
1201 unsigned long begin;
1203 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1204 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1207 ib_destroy_cm_id(p->id);
1210 /* Wait for all sends to complete */
1212 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1213 if (time_after(jiffies, begin + 5 * HZ)) {
1214 ipoib_warn(priv, "timing out; %d sends not completed\n",
1215 p->tx_head - p->tx_tail);
1219 usleep_range(1000, 2000);
1225 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1226 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1227 ipoib_dma_unmap_tx(priv, tx_req);
1228 dev_kfree_skb_any(tx_req->skb);
1229 netif_tx_lock_bh(p->dev);
1232 if (unlikely(priv->tx_head - priv->tx_tail == ipoib_sendq_size >> 1) &&
1233 netif_queue_stopped(p->dev) &&
1234 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1235 netif_wake_queue(p->dev);
1236 netif_tx_unlock_bh(p->dev);
1240 ib_destroy_qp(p->qp);
1246 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1247 struct ib_cm_event *event)
1249 struct ipoib_cm_tx *tx = cm_id->context;
1250 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1251 struct net_device *dev = priv->dev;
1252 struct ipoib_neigh *neigh;
1253 unsigned long flags;
1256 switch (event->event) {
1257 case IB_CM_DREQ_RECEIVED:
1258 ipoib_dbg(priv, "DREQ received.\n");
1259 ib_send_cm_drep(cm_id, NULL, 0);
1261 case IB_CM_REP_RECEIVED:
1262 ipoib_dbg(priv, "REP received.\n");
1263 ret = ipoib_cm_rep_handler(cm_id, event);
1265 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1268 case IB_CM_REQ_ERROR:
1269 case IB_CM_REJ_RECEIVED:
1270 case IB_CM_TIMEWAIT_EXIT:
1271 ipoib_dbg(priv, "CM error %d.\n", event->event);
1272 netif_tx_lock_bh(dev);
1273 spin_lock_irqsave(&priv->lock, flags);
1278 ipoib_neigh_free(neigh);
1283 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1284 list_move(&tx->list, &priv->cm.reap_list);
1285 queue_work(priv->wq, &priv->cm.reap_task);
1288 spin_unlock_irqrestore(&priv->lock, flags);
1289 netif_tx_unlock_bh(dev);
1298 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1299 struct ipoib_neigh *neigh)
1301 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1302 struct ipoib_cm_tx *tx;
1304 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1312 list_add(&tx->list, &priv->cm.start_list);
1313 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1314 queue_work(priv->wq, &priv->cm.start_task);
1318 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1320 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1321 unsigned long flags;
1322 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1323 spin_lock_irqsave(&priv->lock, flags);
1324 list_move(&tx->list, &priv->cm.reap_list);
1325 queue_work(priv->wq, &priv->cm.reap_task);
1326 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1327 tx->neigh->daddr + 4);
1329 spin_unlock_irqrestore(&priv->lock, flags);
1333 #define QPN_AND_OPTIONS_OFFSET 4
1335 static void ipoib_cm_tx_start(struct work_struct *work)
1337 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1339 struct net_device *dev = priv->dev;
1340 struct ipoib_neigh *neigh;
1341 struct ipoib_cm_tx *p;
1342 unsigned long flags;
1343 struct ipoib_path *path;
1346 struct sa_path_rec pathrec;
1349 netif_tx_lock_bh(dev);
1350 spin_lock_irqsave(&priv->lock, flags);
1352 while (!list_empty(&priv->cm.start_list)) {
1353 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1354 list_del_init(&p->list);
1357 qpn = IPOIB_QPN(neigh->daddr);
1359 * As long as the search is with these 2 locks,
1360 * path existence indicates its validity.
1362 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1364 pr_info("%s ignore not valid path %pI6\n",
1366 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1369 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1371 spin_unlock_irqrestore(&priv->lock, flags);
1372 netif_tx_unlock_bh(dev);
1374 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1376 netif_tx_lock_bh(dev);
1377 spin_lock_irqsave(&priv->lock, flags);
1384 ipoib_neigh_free(neigh);
1391 spin_unlock_irqrestore(&priv->lock, flags);
1392 netif_tx_unlock_bh(dev);
1395 static void ipoib_cm_tx_reap(struct work_struct *work)
1397 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1399 struct net_device *dev = priv->dev;
1400 struct ipoib_cm_tx *p;
1401 unsigned long flags;
1403 netif_tx_lock_bh(dev);
1404 spin_lock_irqsave(&priv->lock, flags);
1406 while (!list_empty(&priv->cm.reap_list)) {
1407 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1408 list_del_init(&p->list);
1409 spin_unlock_irqrestore(&priv->lock, flags);
1410 netif_tx_unlock_bh(dev);
1411 ipoib_cm_tx_destroy(p);
1412 netif_tx_lock_bh(dev);
1413 spin_lock_irqsave(&priv->lock, flags);
1416 spin_unlock_irqrestore(&priv->lock, flags);
1417 netif_tx_unlock_bh(dev);
1420 static void ipoib_cm_skb_reap(struct work_struct *work)
1422 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1424 struct net_device *dev = priv->dev;
1425 struct sk_buff *skb;
1426 unsigned long flags;
1427 unsigned mtu = priv->mcast_mtu;
1429 netif_tx_lock_bh(dev);
1430 spin_lock_irqsave(&priv->lock, flags);
1432 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1433 spin_unlock_irqrestore(&priv->lock, flags);
1434 netif_tx_unlock_bh(dev);
1436 if (skb->protocol == htons(ETH_P_IP))
1437 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 else if (skb->protocol == htons(ETH_P_IPV6))
1440 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1442 dev_kfree_skb_any(skb);
1444 netif_tx_lock_bh(dev);
1445 spin_lock_irqsave(&priv->lock, flags);
1448 spin_unlock_irqrestore(&priv->lock, flags);
1449 netif_tx_unlock_bh(dev);
1452 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1455 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1456 int e = skb_queue_empty(&priv->cm.skb_queue);
1459 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1461 skb_queue_tail(&priv->cm.skb_queue, skb);
1463 queue_work(priv->wq, &priv->cm.skb_task);
1466 static void ipoib_cm_rx_reap(struct work_struct *work)
1468 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1469 cm.rx_reap_task)->dev);
1472 static void ipoib_cm_stale_task(struct work_struct *work)
1474 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1475 cm.stale_task.work);
1476 struct ipoib_cm_rx *p;
1479 spin_lock_irq(&priv->lock);
1480 while (!list_empty(&priv->cm.passive_ids)) {
1481 /* List is sorted by LRU, start from tail,
1482 * stop when we see a recently used entry */
1483 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1484 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1486 list_move(&p->list, &priv->cm.rx_error_list);
1487 p->state = IPOIB_CM_RX_ERROR;
1488 spin_unlock_irq(&priv->lock);
1489 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1491 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1492 spin_lock_irq(&priv->lock);
1495 if (!list_empty(&priv->cm.passive_ids))
1496 queue_delayed_work(priv->wq,
1497 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1498 spin_unlock_irq(&priv->lock);
1501 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1504 struct net_device *dev = to_net_dev(d);
1505 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1507 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1508 return sprintf(buf, "connected\n");
1510 return sprintf(buf, "datagram\n");
1513 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1514 const char *buf, size_t count)
1516 struct net_device *dev = to_net_dev(d);
1518 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1520 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1523 if (!mutex_trylock(&priv->sysfs_mutex))
1524 return restart_syscall();
1526 if (!rtnl_trylock()) {
1527 mutex_unlock(&priv->sysfs_mutex);
1528 return restart_syscall();
1531 ret = ipoib_set_mode(dev, buf);
1533 /* The assumption is that the function ipoib_set_mode returned
1534 * with the rtnl held by it, if not the value -EBUSY returned,
1535 * then no need to rtnl_unlock
1539 mutex_unlock(&priv->sysfs_mutex);
1541 return (!ret || ret == -EBUSY) ? count : ret;
1544 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1546 int ipoib_cm_add_mode_attr(struct net_device *dev)
1548 return device_create_file(&dev->dev, &dev_attr_mode);
1551 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1553 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1554 struct ib_srq_init_attr srq_init_attr = {
1555 .srq_type = IB_SRQT_BASIC,
1557 .max_wr = ipoib_recvq_size,
1562 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1563 if (IS_ERR(priv->cm.srq)) {
1564 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1565 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1566 priv->ca->name, PTR_ERR(priv->cm.srq));
1567 priv->cm.srq = NULL;
1571 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1572 if (!priv->cm.srq_ring) {
1573 ib_destroy_srq(priv->cm.srq);
1574 priv->cm.srq = NULL;
1580 int ipoib_cm_dev_init(struct net_device *dev)
1582 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1585 INIT_LIST_HEAD(&priv->cm.passive_ids);
1586 INIT_LIST_HEAD(&priv->cm.reap_list);
1587 INIT_LIST_HEAD(&priv->cm.start_list);
1588 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1589 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1590 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1591 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1592 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1593 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1594 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1595 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1596 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1598 skb_queue_head_init(&priv->cm.skb_queue);
1600 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1602 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1603 ipoib_cm_create_srq(dev, max_srq_sge);
1604 if (ipoib_cm_has_srq(dev)) {
1605 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1606 priv->cm.num_frags = max_srq_sge;
1607 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1608 priv->cm.max_cm_mtu, priv->cm.num_frags);
1610 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1611 priv->cm.num_frags = IPOIB_CM_RX_SG;
1614 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1616 if (ipoib_cm_has_srq(dev)) {
1617 for (i = 0; i < ipoib_recvq_size; ++i) {
1618 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1619 priv->cm.num_frags - 1,
1620 priv->cm.srq_ring[i].mapping,
1622 ipoib_warn(priv, "failed to allocate "
1623 "receive buffer %d\n", i);
1624 ipoib_cm_dev_cleanup(dev);
1628 if (ipoib_cm_post_receive_srq(dev, i)) {
1629 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1630 "failed for buf %d\n", i);
1631 ipoib_cm_dev_cleanup(dev);
1637 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1641 void ipoib_cm_dev_cleanup(struct net_device *dev)
1643 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1649 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1651 ret = ib_destroy_srq(priv->cm.srq);
1653 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1655 priv->cm.srq = NULL;
1656 if (!priv->cm.srq_ring)
1659 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1660 priv->cm.srq_ring = NULL;