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:
515 ib_send_cm_drep(cm_id, NULL, 0);
517 case IB_CM_REJ_RECEIVED:
519 priv = ipoib_priv(p->dev);
520 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
521 ipoib_warn(priv, "unable to move qp to error state\n");
527 /* Adjust length of skb with fragments to match received data */
528 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
529 unsigned int length, struct sk_buff *toskb)
534 /* put header into skb */
535 size = min(length, hdr_space);
540 num_frags = skb_shinfo(skb)->nr_frags;
541 for (i = 0; i < num_frags; i++) {
542 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
545 /* don't need this page */
546 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
548 --skb_shinfo(skb)->nr_frags;
550 size = min(length, (unsigned) PAGE_SIZE);
552 skb_frag_size_set(frag, size);
553 skb->data_len += size;
554 skb->truesize += size;
561 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
563 struct ipoib_dev_priv *priv = ipoib_priv(dev);
564 struct ipoib_cm_rx_buf *rx_ring;
565 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
566 struct sk_buff *skb, *newskb;
567 struct ipoib_cm_rx *p;
569 u64 mapping[IPOIB_CM_RX_SG];
572 struct sk_buff *small_skb;
574 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
577 if (unlikely(wr_id >= ipoib_recvq_size)) {
578 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
579 spin_lock_irqsave(&priv->lock, flags);
580 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
581 ipoib_cm_start_rx_drain(priv);
582 queue_work(priv->wq, &priv->cm.rx_reap_task);
583 spin_unlock_irqrestore(&priv->lock, flags);
585 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
586 wr_id, ipoib_recvq_size);
590 p = wc->qp->qp_context;
592 has_srq = ipoib_cm_has_srq(dev);
593 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
595 skb = rx_ring[wr_id].skb;
597 if (unlikely(wc->status != IB_WC_SUCCESS)) {
598 ipoib_dbg(priv, "cm recv error "
599 "(status=%d, wrid=%d vend_err %x)\n",
600 wc->status, wr_id, wc->vendor_err);
601 ++dev->stats.rx_dropped;
605 if (!--p->recv_count) {
606 spin_lock_irqsave(&priv->lock, flags);
607 list_move(&p->list, &priv->cm.rx_reap_list);
608 spin_unlock_irqrestore(&priv->lock, flags);
609 queue_work(priv->wq, &priv->cm.rx_reap_task);
615 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
616 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
617 spin_lock_irqsave(&priv->lock, flags);
618 p->jiffies = jiffies;
619 /* Move this entry to list head, but do not re-add it
620 * if it has been moved out of list. */
621 if (p->state == IPOIB_CM_RX_LIVE)
622 list_move(&p->list, &priv->cm.passive_ids);
623 spin_unlock_irqrestore(&priv->lock, flags);
627 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
628 int dlen = wc->byte_len;
630 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
632 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
633 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
634 dlen, DMA_FROM_DEVICE);
635 skb_copy_from_linear_data(skb, small_skb->data, dlen);
636 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
637 dlen, DMA_FROM_DEVICE);
638 skb_put(small_skb, dlen);
644 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
645 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
647 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
648 mapping, GFP_ATOMIC);
649 if (unlikely(!newskb)) {
651 * If we can't allocate a new RX buffer, dump
652 * this packet and reuse the old buffer.
654 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
655 ++dev->stats.rx_dropped;
659 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
660 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
662 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
663 wc->byte_len, wc->slid);
665 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
668 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
669 skb_add_pseudo_hdr(skb);
671 ++dev->stats.rx_packets;
672 dev->stats.rx_bytes += skb->len;
675 /* XXX get correct PACKET_ type here */
676 skb->pkt_type = PACKET_HOST;
677 netif_receive_skb(skb);
681 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
682 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
683 "for buf %d\n", wr_id);
685 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
690 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
691 "for buf %d\n", wr_id);
696 static inline int post_send(struct ipoib_dev_priv *priv,
697 struct ipoib_cm_tx *tx,
699 struct ipoib_tx_buf *tx_req)
701 struct ib_send_wr *bad_wr;
703 ipoib_build_sge(priv, tx_req);
705 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
707 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
710 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
712 struct ipoib_dev_priv *priv = ipoib_priv(dev);
713 struct ipoib_tx_buf *tx_req;
715 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
717 if (unlikely(skb->len > tx->mtu)) {
718 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
720 ++dev->stats.tx_dropped;
721 ++dev->stats.tx_errors;
722 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
725 if (skb_shinfo(skb)->nr_frags > usable_sge) {
726 if (skb_linearize(skb) < 0) {
727 ipoib_warn(priv, "skb could not be linearized\n");
728 ++dev->stats.tx_dropped;
729 ++dev->stats.tx_errors;
730 dev_kfree_skb_any(skb);
733 /* Does skb_linearize return ok without reducing nr_frags? */
734 if (skb_shinfo(skb)->nr_frags > usable_sge) {
735 ipoib_warn(priv, "too many frags after skb linearize\n");
736 ++dev->stats.tx_dropped;
737 ++dev->stats.tx_errors;
738 dev_kfree_skb_any(skb);
742 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
743 tx->tx_head, skb->len, tx->qp->qp_num);
746 * We put the skb into the tx_ring _before_ we call post_send()
747 * because it's entirely possible that the completion handler will
748 * run before we execute anything after the post_send(). That
749 * means we have to make sure everything is properly recorded and
750 * our state is consistent before we call post_send().
752 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
755 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
756 ++dev->stats.tx_errors;
757 dev_kfree_skb_any(skb);
764 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
766 ipoib_warn(priv, "post_send failed, error %d\n", rc);
767 ++dev->stats.tx_errors;
768 ipoib_dma_unmap_tx(priv, tx_req);
769 dev_kfree_skb_any(skb);
771 netif_trans_update(dev);
774 if (++priv->tx_outstanding == ipoib_sendq_size) {
775 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
777 netif_stop_queue(dev);
778 rc = ib_req_notify_cq(priv->send_cq,
779 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
781 ipoib_warn(priv, "request notify on send CQ failed\n");
783 ipoib_send_comp_handler(priv->send_cq, dev);
788 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
790 struct ipoib_dev_priv *priv = ipoib_priv(dev);
791 struct ipoib_cm_tx *tx = wc->qp->qp_context;
792 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
793 struct ipoib_tx_buf *tx_req;
796 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
799 if (unlikely(wr_id >= ipoib_sendq_size)) {
800 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
801 wr_id, ipoib_sendq_size);
805 tx_req = &tx->tx_ring[wr_id];
807 ipoib_dma_unmap_tx(priv, tx_req);
809 /* FIXME: is this right? Shouldn't we only increment on success? */
810 ++dev->stats.tx_packets;
811 dev->stats.tx_bytes += tx_req->skb->len;
813 dev_kfree_skb_any(tx_req->skb);
818 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
819 netif_queue_stopped(dev) &&
820 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
821 netif_wake_queue(dev);
823 if (wc->status != IB_WC_SUCCESS &&
824 wc->status != IB_WC_WR_FLUSH_ERR) {
825 struct ipoib_neigh *neigh;
827 if (wc->status != IB_WC_RNR_RETRY_EXC_ERR)
828 ipoib_warn(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
829 wc->status, wr_id, wc->vendor_err);
831 ipoib_dbg(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
832 wc->status, wr_id, wc->vendor_err);
834 spin_lock_irqsave(&priv->lock, flags);
839 ipoib_neigh_free(neigh);
844 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
845 list_move(&tx->list, &priv->cm.reap_list);
846 queue_work(priv->wq, &priv->cm.reap_task);
849 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
851 spin_unlock_irqrestore(&priv->lock, flags);
854 netif_tx_unlock(dev);
857 int ipoib_cm_dev_open(struct net_device *dev)
859 struct ipoib_dev_priv *priv = ipoib_priv(dev);
862 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
865 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
866 if (IS_ERR(priv->cm.id)) {
867 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
868 ret = PTR_ERR(priv->cm.id);
872 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
875 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
876 IPOIB_CM_IETF_ID | priv->qp->qp_num);
883 ib_destroy_cm_id(priv->cm.id);
889 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
891 struct ipoib_dev_priv *priv = ipoib_priv(dev);
892 struct ipoib_cm_rx *rx, *n;
895 spin_lock_irq(&priv->lock);
896 list_splice_init(&priv->cm.rx_reap_list, &list);
897 spin_unlock_irq(&priv->lock);
899 list_for_each_entry_safe(rx, n, &list, list) {
900 ib_destroy_cm_id(rx->id);
901 ib_destroy_qp(rx->qp);
902 if (!ipoib_cm_has_srq(dev)) {
903 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
904 spin_lock_irq(&priv->lock);
905 --priv->cm.nonsrq_conn_qp;
906 spin_unlock_irq(&priv->lock);
912 void ipoib_cm_dev_stop(struct net_device *dev)
914 struct ipoib_dev_priv *priv = ipoib_priv(dev);
915 struct ipoib_cm_rx *p;
919 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
922 ib_destroy_cm_id(priv->cm.id);
925 spin_lock_irq(&priv->lock);
926 while (!list_empty(&priv->cm.passive_ids)) {
927 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
928 list_move(&p->list, &priv->cm.rx_error_list);
929 p->state = IPOIB_CM_RX_ERROR;
930 spin_unlock_irq(&priv->lock);
931 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
933 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
934 spin_lock_irq(&priv->lock);
937 /* Wait for all RX to be drained */
940 while (!list_empty(&priv->cm.rx_error_list) ||
941 !list_empty(&priv->cm.rx_flush_list) ||
942 !list_empty(&priv->cm.rx_drain_list)) {
943 if (time_after(jiffies, begin + 5 * HZ)) {
944 ipoib_warn(priv, "RX drain timing out\n");
947 * assume the HW is wedged and just free up everything.
949 list_splice_init(&priv->cm.rx_flush_list,
950 &priv->cm.rx_reap_list);
951 list_splice_init(&priv->cm.rx_error_list,
952 &priv->cm.rx_reap_list);
953 list_splice_init(&priv->cm.rx_drain_list,
954 &priv->cm.rx_reap_list);
957 spin_unlock_irq(&priv->lock);
958 usleep_range(1000, 2000);
960 spin_lock_irq(&priv->lock);
963 spin_unlock_irq(&priv->lock);
965 ipoib_cm_free_rx_reap_list(dev);
967 cancel_delayed_work(&priv->cm.stale_task);
970 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
972 struct ipoib_cm_tx *p = cm_id->context;
973 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
974 struct ipoib_cm_data *data = event->private_data;
975 struct sk_buff_head skqueue;
976 struct ib_qp_attr qp_attr;
977 int qp_attr_mask, ret;
980 p->mtu = be32_to_cpu(data->mtu);
982 if (p->mtu <= IPOIB_ENCAP_LEN) {
983 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
984 p->mtu, IPOIB_ENCAP_LEN);
988 qp_attr.qp_state = IB_QPS_RTR;
989 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
991 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
995 qp_attr.rq_psn = 0 /* FIXME */;
996 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
998 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1002 qp_attr.qp_state = IB_QPS_RTS;
1003 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1005 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1008 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1010 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1014 skb_queue_head_init(&skqueue);
1016 spin_lock_irq(&priv->lock);
1017 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1019 while ((skb = __skb_dequeue(&p->neigh->queue)))
1020 __skb_queue_tail(&skqueue, skb);
1021 spin_unlock_irq(&priv->lock);
1023 while ((skb = __skb_dequeue(&skqueue))) {
1025 ret = dev_queue_xmit(skb);
1027 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1031 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1033 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1039 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1041 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1042 struct ib_qp_init_attr attr = {
1043 .send_cq = priv->recv_cq,
1044 .recv_cq = priv->recv_cq,
1045 .srq = priv->cm.srq,
1046 .cap.max_send_wr = ipoib_sendq_size,
1047 .cap.max_send_sge = 1,
1048 .sq_sig_type = IB_SIGNAL_ALL_WR,
1049 .qp_type = IB_QPT_RC,
1053 struct ib_qp *tx_qp;
1055 if (dev->features & NETIF_F_SG)
1056 attr.cap.max_send_sge =
1057 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1059 tx_qp = ib_create_qp(priv->pd, &attr);
1060 tx->max_send_sge = attr.cap.max_send_sge;
1064 static int ipoib_cm_send_req(struct net_device *dev,
1065 struct ib_cm_id *id, struct ib_qp *qp,
1067 struct sa_path_rec *pathrec)
1069 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1070 struct ipoib_cm_data data = {};
1071 struct ib_cm_req_param req = {};
1073 data.qpn = cpu_to_be32(priv->qp->qp_num);
1074 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1076 req.primary_path = pathrec;
1077 req.alternate_path = NULL;
1078 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1079 req.qp_num = qp->qp_num;
1080 req.qp_type = qp->qp_type;
1081 req.private_data = &data;
1082 req.private_data_len = sizeof data;
1083 req.flow_control = 0;
1085 req.starting_psn = 0; /* FIXME */
1088 * Pick some arbitrary defaults here; we could make these
1089 * module parameters if anyone cared about setting them.
1091 req.responder_resources = 4;
1092 req.remote_cm_response_timeout = 20;
1093 req.local_cm_response_timeout = 20;
1094 req.retry_count = 0; /* RFC draft warns against retries */
1095 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1096 req.max_cm_retries = 15;
1097 req.srq = ipoib_cm_has_srq(dev);
1098 return ib_send_cm_req(id, &req);
1101 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1102 struct ib_cm_id *cm_id, struct ib_qp *qp)
1104 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1105 struct ib_qp_attr qp_attr;
1106 int qp_attr_mask, ret;
1107 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1109 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1113 qp_attr.qp_state = IB_QPS_INIT;
1114 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1115 qp_attr.port_num = priv->port;
1116 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1118 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1120 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1126 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1127 struct sa_path_rec *pathrec)
1129 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1130 unsigned int noio_flag;
1133 noio_flag = memalloc_noio_save();
1134 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring));
1139 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1141 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1142 memalloc_noio_restore(noio_flag);
1143 if (IS_ERR(p->qp)) {
1144 ret = PTR_ERR(p->qp);
1145 ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1149 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1150 if (IS_ERR(p->id)) {
1151 ret = PTR_ERR(p->id);
1152 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1156 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1158 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1159 goto err_modify_send;
1162 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1164 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1165 goto err_modify_send;
1168 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1169 p->qp->qp_num, pathrec->dgid.raw, qpn);
1174 ib_destroy_cm_id(p->id);
1177 ib_destroy_qp(p->qp);
1185 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1187 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1188 struct ipoib_tx_buf *tx_req;
1189 unsigned long begin;
1191 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1192 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1195 ib_destroy_cm_id(p->id);
1198 /* Wait for all sends to complete */
1200 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1201 if (time_after(jiffies, begin + 5 * HZ)) {
1202 ipoib_warn(priv, "timing out; %d sends not completed\n",
1203 p->tx_head - p->tx_tail);
1207 usleep_range(1000, 2000);
1213 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1214 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1215 ipoib_dma_unmap_tx(priv, tx_req);
1216 dev_kfree_skb_any(tx_req->skb);
1218 netif_tx_lock_bh(p->dev);
1219 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1220 netif_queue_stopped(p->dev) &&
1221 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1222 netif_wake_queue(p->dev);
1223 netif_tx_unlock_bh(p->dev);
1227 ib_destroy_qp(p->qp);
1233 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1234 struct ib_cm_event *event)
1236 struct ipoib_cm_tx *tx = cm_id->context;
1237 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1238 struct net_device *dev = priv->dev;
1239 struct ipoib_neigh *neigh;
1240 unsigned long flags;
1243 switch (event->event) {
1244 case IB_CM_DREQ_RECEIVED:
1245 ipoib_dbg(priv, "DREQ received.\n");
1246 ib_send_cm_drep(cm_id, NULL, 0);
1248 case IB_CM_REP_RECEIVED:
1249 ipoib_dbg(priv, "REP received.\n");
1250 ret = ipoib_cm_rep_handler(cm_id, event);
1252 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1255 case IB_CM_REQ_ERROR:
1256 case IB_CM_REJ_RECEIVED:
1257 case IB_CM_TIMEWAIT_EXIT:
1258 ipoib_dbg(priv, "CM error %d.\n", event->event);
1259 netif_tx_lock_bh(dev);
1260 spin_lock_irqsave(&priv->lock, flags);
1265 ipoib_neigh_free(neigh);
1270 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1271 list_move(&tx->list, &priv->cm.reap_list);
1272 queue_work(priv->wq, &priv->cm.reap_task);
1275 spin_unlock_irqrestore(&priv->lock, flags);
1276 netif_tx_unlock_bh(dev);
1285 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1286 struct ipoib_neigh *neigh)
1288 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1289 struct ipoib_cm_tx *tx;
1291 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1299 list_add(&tx->list, &priv->cm.start_list);
1300 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1301 queue_work(priv->wq, &priv->cm.start_task);
1305 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1307 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1308 unsigned long flags;
1309 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1310 spin_lock_irqsave(&priv->lock, flags);
1311 list_move(&tx->list, &priv->cm.reap_list);
1312 queue_work(priv->wq, &priv->cm.reap_task);
1313 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1314 tx->neigh->daddr + 4);
1316 spin_unlock_irqrestore(&priv->lock, flags);
1320 #define QPN_AND_OPTIONS_OFFSET 4
1322 static void ipoib_cm_tx_start(struct work_struct *work)
1324 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1326 struct net_device *dev = priv->dev;
1327 struct ipoib_neigh *neigh;
1328 struct ipoib_cm_tx *p;
1329 unsigned long flags;
1330 struct ipoib_path *path;
1333 struct sa_path_rec pathrec;
1336 netif_tx_lock_bh(dev);
1337 spin_lock_irqsave(&priv->lock, flags);
1339 while (!list_empty(&priv->cm.start_list)) {
1340 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1341 list_del_init(&p->list);
1344 qpn = IPOIB_QPN(neigh->daddr);
1346 * As long as the search is with these 2 locks,
1347 * path existence indicates its validity.
1349 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1351 pr_info("%s ignore not valid path %pI6\n",
1353 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1356 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1358 spin_unlock_irqrestore(&priv->lock, flags);
1359 netif_tx_unlock_bh(dev);
1361 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1363 netif_tx_lock_bh(dev);
1364 spin_lock_irqsave(&priv->lock, flags);
1371 ipoib_neigh_free(neigh);
1378 spin_unlock_irqrestore(&priv->lock, flags);
1379 netif_tx_unlock_bh(dev);
1382 static void ipoib_cm_tx_reap(struct work_struct *work)
1384 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1386 struct net_device *dev = priv->dev;
1387 struct ipoib_cm_tx *p;
1388 unsigned long flags;
1390 netif_tx_lock_bh(dev);
1391 spin_lock_irqsave(&priv->lock, flags);
1393 while (!list_empty(&priv->cm.reap_list)) {
1394 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1395 list_del_init(&p->list);
1396 spin_unlock_irqrestore(&priv->lock, flags);
1397 netif_tx_unlock_bh(dev);
1398 ipoib_cm_tx_destroy(p);
1399 netif_tx_lock_bh(dev);
1400 spin_lock_irqsave(&priv->lock, flags);
1403 spin_unlock_irqrestore(&priv->lock, flags);
1404 netif_tx_unlock_bh(dev);
1407 static void ipoib_cm_skb_reap(struct work_struct *work)
1409 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1411 struct net_device *dev = priv->dev;
1412 struct sk_buff *skb;
1413 unsigned long flags;
1414 unsigned mtu = priv->mcast_mtu;
1416 netif_tx_lock_bh(dev);
1417 spin_lock_irqsave(&priv->lock, flags);
1419 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1420 spin_unlock_irqrestore(&priv->lock, flags);
1421 netif_tx_unlock_bh(dev);
1423 if (skb->protocol == htons(ETH_P_IP))
1424 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1425 #if IS_ENABLED(CONFIG_IPV6)
1426 else if (skb->protocol == htons(ETH_P_IPV6))
1427 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1429 dev_kfree_skb_any(skb);
1431 netif_tx_lock_bh(dev);
1432 spin_lock_irqsave(&priv->lock, flags);
1435 spin_unlock_irqrestore(&priv->lock, flags);
1436 netif_tx_unlock_bh(dev);
1439 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1442 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1443 int e = skb_queue_empty(&priv->cm.skb_queue);
1446 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1448 skb_queue_tail(&priv->cm.skb_queue, skb);
1450 queue_work(priv->wq, &priv->cm.skb_task);
1453 static void ipoib_cm_rx_reap(struct work_struct *work)
1455 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1456 cm.rx_reap_task)->dev);
1459 static void ipoib_cm_stale_task(struct work_struct *work)
1461 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1462 cm.stale_task.work);
1463 struct ipoib_cm_rx *p;
1466 spin_lock_irq(&priv->lock);
1467 while (!list_empty(&priv->cm.passive_ids)) {
1468 /* List is sorted by LRU, start from tail,
1469 * stop when we see a recently used entry */
1470 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1471 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1473 list_move(&p->list, &priv->cm.rx_error_list);
1474 p->state = IPOIB_CM_RX_ERROR;
1475 spin_unlock_irq(&priv->lock);
1476 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1478 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1479 spin_lock_irq(&priv->lock);
1482 if (!list_empty(&priv->cm.passive_ids))
1483 queue_delayed_work(priv->wq,
1484 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1485 spin_unlock_irq(&priv->lock);
1488 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1491 struct net_device *dev = to_net_dev(d);
1492 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1494 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1495 return sprintf(buf, "connected\n");
1497 return sprintf(buf, "datagram\n");
1500 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1501 const char *buf, size_t count)
1503 struct net_device *dev = to_net_dev(d);
1505 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1507 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1510 if (!rtnl_trylock())
1511 return restart_syscall();
1513 ret = ipoib_set_mode(dev, buf);
1515 /* The assumption is that the function ipoib_set_mode returned
1516 * with the rtnl held by it, if not the value -EBUSY returned,
1517 * then no need to rtnl_unlock
1522 return (!ret || ret == -EBUSY) ? count : ret;
1525 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1527 int ipoib_cm_add_mode_attr(struct net_device *dev)
1529 return device_create_file(&dev->dev, &dev_attr_mode);
1532 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1534 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1535 struct ib_srq_init_attr srq_init_attr = {
1536 .srq_type = IB_SRQT_BASIC,
1538 .max_wr = ipoib_recvq_size,
1543 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1544 if (IS_ERR(priv->cm.srq)) {
1545 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1546 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1547 priv->ca->name, PTR_ERR(priv->cm.srq));
1548 priv->cm.srq = NULL;
1552 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1553 if (!priv->cm.srq_ring) {
1554 ib_destroy_srq(priv->cm.srq);
1555 priv->cm.srq = NULL;
1561 int ipoib_cm_dev_init(struct net_device *dev)
1563 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1566 INIT_LIST_HEAD(&priv->cm.passive_ids);
1567 INIT_LIST_HEAD(&priv->cm.reap_list);
1568 INIT_LIST_HEAD(&priv->cm.start_list);
1569 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1570 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1571 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1572 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1573 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1574 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1575 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1576 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1577 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1579 skb_queue_head_init(&priv->cm.skb_queue);
1581 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1583 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1584 ipoib_cm_create_srq(dev, max_srq_sge);
1585 if (ipoib_cm_has_srq(dev)) {
1586 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1587 priv->cm.num_frags = max_srq_sge;
1588 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1589 priv->cm.max_cm_mtu, priv->cm.num_frags);
1591 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1592 priv->cm.num_frags = IPOIB_CM_RX_SG;
1595 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1597 if (ipoib_cm_has_srq(dev)) {
1598 for (i = 0; i < ipoib_recvq_size; ++i) {
1599 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1600 priv->cm.num_frags - 1,
1601 priv->cm.srq_ring[i].mapping,
1603 ipoib_warn(priv, "failed to allocate "
1604 "receive buffer %d\n", i);
1605 ipoib_cm_dev_cleanup(dev);
1609 if (ipoib_cm_post_receive_srq(dev, i)) {
1610 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1611 "failed for buf %d\n", i);
1612 ipoib_cm_dev_cleanup(dev);
1618 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1622 void ipoib_cm_dev_cleanup(struct net_device *dev)
1624 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1630 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1632 ret = ib_destroy_srq(priv->cm.srq);
1634 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1636 priv->cm.srq = NULL;
1637 if (!priv->cm.srq_ring)
1640 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1641 priv->cm.srq_ring = NULL;