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#include <linux/sched/signal.h>
  42#include <linux/sched/mm.h>
  43
  44#include "ipoib.h"
  45
  46int ipoib_max_conn_qp = 128;
  47
  48module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  49MODULE_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)");
  52
  53#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  54static int data_debug_level;
  55
  56module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  57MODULE_PARM_DESC(cm_data_debug_level,
  58		 "Enable data path debug tracing for connected mode if > 0");
  59#endif
  60
  61#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  62
  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)
  67
  68#define IPOIB_CM_RX_RESERVE     (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
  69
  70static struct ib_qp_attr ipoib_cm_err_attr = {
  71	.qp_state = IB_QPS_ERR
  72};
  73
  74#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  75
  76static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  77	.opcode = IB_WR_SEND,
  78};
  79
  80static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  81			       const struct ib_cm_event *event);
  82
  83static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  84				  u64 mapping[IPOIB_CM_RX_SG])
  85{
  86	int i;
  87
  88	ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  89
  90	for (i = 0; i < frags; ++i)
  91		ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  92}
  93
  94static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  95{
  96	struct ipoib_dev_priv *priv = ipoib_priv(dev);
  97	int i, ret;
  98
  99	priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 100
 101	for (i = 0; i < priv->cm.num_frags; ++i)
 102		priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 103
 104	ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, NULL);
 105	if (unlikely(ret)) {
 106		ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 107		ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 108				      priv->cm.srq_ring[id].mapping);
 109		dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 110		priv->cm.srq_ring[id].skb = NULL;
 111	}
 112
 113	return ret;
 114}
 115
 116static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 117					struct ipoib_cm_rx *rx,
 118					struct ib_recv_wr *wr,
 119					struct ib_sge *sge, int id)
 120{
 121	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 122	int i, ret;
 123
 124	wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 125
 126	for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 127		sge[i].addr = rx->rx_ring[id].mapping[i];
 128
 129	ret = ib_post_recv(rx->qp, wr, NULL);
 130	if (unlikely(ret)) {
 131		ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 132		ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 133				      rx->rx_ring[id].mapping);
 134		dev_kfree_skb_any(rx->rx_ring[id].skb);
 135		rx->rx_ring[id].skb = NULL;
 136	}
 137
 138	return ret;
 139}
 140
 141static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 142					     struct ipoib_cm_rx_buf *rx_ring,
 143					     int id, int frags,
 144					     u64 mapping[IPOIB_CM_RX_SG],
 145					     gfp_t gfp)
 146{
 147	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 148	struct sk_buff *skb;
 149	int i;
 150
 151	skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
 152	if (unlikely(!skb))
 153		return NULL;
 154
 155	/*
 156	 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
 157	 * IP header to a multiple of 16.
 158	 */
 159	skb_reserve(skb, IPOIB_CM_RX_RESERVE);
 160
 161	mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 162				       DMA_FROM_DEVICE);
 163	if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 164		dev_kfree_skb_any(skb);
 165		return NULL;
 166	}
 167
 168	for (i = 0; i < frags; i++) {
 169		struct page *page = alloc_page(gfp);
 170
 171		if (!page)
 172			goto partial_error;
 173		skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 174
 175		mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 176						 0, PAGE_SIZE, DMA_FROM_DEVICE);
 177		if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 178			goto partial_error;
 179	}
 180
 181	rx_ring[id].skb = skb;
 182	return skb;
 183
 184partial_error:
 185
 186	ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 187
 188	for (; i > 0; --i)
 189		ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 190
 191	dev_kfree_skb_any(skb);
 192	return NULL;
 193}
 194
 195static void ipoib_cm_free_rx_ring(struct net_device *dev,
 196				  struct ipoib_cm_rx_buf *rx_ring)
 197{
 198	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 199	int i;
 200
 201	for (i = 0; i < ipoib_recvq_size; ++i)
 202		if (rx_ring[i].skb) {
 203			ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 204					      rx_ring[i].mapping);
 205			dev_kfree_skb_any(rx_ring[i].skb);
 206		}
 207
 208	vfree(rx_ring);
 209}
 210
 211static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 212{
 213	struct ipoib_cm_rx *p;
 214
 215	/* We only reserved 1 extra slot in CQ for drain WRs, so
 216	 * make sure we have at most 1 outstanding WR. */
 217	if (list_empty(&priv->cm.rx_flush_list) ||
 218	    !list_empty(&priv->cm.rx_drain_list))
 219		return;
 220
 221	/*
 222	 * QPs on flush list are error state.  This way, a "flush
 223	 * error" WC will be immediately generated for each WR we post.
 224	 */
 225	p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 226	ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
 227	if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, NULL))
 228		ipoib_warn(priv, "failed to post drain wr\n");
 229
 230	list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 231}
 232
 233static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 234{
 235	struct ipoib_cm_rx *p = ctx;
 236	struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 237	unsigned long flags;
 238
 239	if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 240		return;
 241
 242	spin_lock_irqsave(&priv->lock, flags);
 243	list_move(&p->list, &priv->cm.rx_flush_list);
 244	p->state = IPOIB_CM_RX_FLUSH;
 245	ipoib_cm_start_rx_drain(priv);
 246	spin_unlock_irqrestore(&priv->lock, flags);
 247}
 248
 249static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 250					   struct ipoib_cm_rx *p)
 251{
 252	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 253	struct ib_qp_init_attr attr = {
 254		.event_handler = ipoib_cm_rx_event_handler,
 255		.send_cq = priv->recv_cq, /* For drain WR */
 256		.recv_cq = priv->recv_cq,
 257		.srq = priv->cm.srq,
 258		.cap.max_send_wr = 1, /* For drain WR */
 259		.cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 260		.sq_sig_type = IB_SIGNAL_ALL_WR,
 261		.qp_type = IB_QPT_RC,
 262		.qp_context = p,
 263	};
 264
 265	if (!ipoib_cm_has_srq(dev)) {
 266		attr.cap.max_recv_wr  = ipoib_recvq_size;
 267		attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 268	}
 269
 270	return ib_create_qp(priv->pd, &attr);
 271}
 272
 273static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 274				 struct ib_cm_id *cm_id, struct ib_qp *qp,
 275				 unsigned int psn)
 276{
 277	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 278	struct ib_qp_attr qp_attr;
 279	int qp_attr_mask, ret;
 280
 281	qp_attr.qp_state = IB_QPS_INIT;
 282	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 283	if (ret) {
 284		ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 285		return ret;
 286	}
 287	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 288	if (ret) {
 289		ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 290		return ret;
 291	}
 292	qp_attr.qp_state = IB_QPS_RTR;
 293	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 294	if (ret) {
 295		ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 296		return ret;
 297	}
 298	qp_attr.rq_psn = psn;
 299	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 300	if (ret) {
 301		ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 302		return ret;
 303	}
 304
 305	/*
 306	 * Current Mellanox HCA firmware won't generate completions
 307	 * with error for drain WRs unless the QP has been moved to
 308	 * RTS first. This work-around leaves a window where a QP has
 309	 * moved to error asynchronously, but this will eventually get
 310	 * fixed in firmware, so let's not error out if modify QP
 311	 * fails.
 312	 */
 313	qp_attr.qp_state = IB_QPS_RTS;
 314	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 315	if (ret) {
 316		ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 317		return 0;
 318	}
 319	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 320	if (ret) {
 321		ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 322		return 0;
 323	}
 324
 325	return 0;
 326}
 327
 328static void ipoib_cm_init_rx_wr(struct net_device *dev,
 329				struct ib_recv_wr *wr,
 330				struct ib_sge *sge)
 331{
 332	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 333	int i;
 334
 335	for (i = 0; i < priv->cm.num_frags; ++i)
 336		sge[i].lkey = priv->pd->local_dma_lkey;
 337
 338	sge[0].length = IPOIB_CM_HEAD_SIZE;
 339	for (i = 1; i < priv->cm.num_frags; ++i)
 340		sge[i].length = PAGE_SIZE;
 341
 342	wr->next    = NULL;
 343	wr->sg_list = sge;
 344	wr->num_sge = priv->cm.num_frags;
 345}
 346
 347static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 348				   struct ipoib_cm_rx *rx)
 349{
 350	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 351	struct {
 352		struct ib_recv_wr wr;
 353		struct ib_sge sge[IPOIB_CM_RX_SG];
 354	} *t;
 355	int ret;
 356	int i;
 357
 358	rx->rx_ring = vzalloc(array_size(ipoib_recvq_size,
 359					 sizeof(*rx->rx_ring)));
 360	if (!rx->rx_ring)
 361		return -ENOMEM;
 362
 363	t = kmalloc(sizeof(*t), GFP_KERNEL);
 364	if (!t) {
 365		ret = -ENOMEM;
 366		goto err_free_1;
 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					   GFP_KERNEL)) {
 387			ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 388			ret = -ENOMEM;
 389			goto err_count;
 390		}
 391		ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 392		if (ret) {
 393			ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 394				   "failed for buf %d\n", i);
 395			ret = -EIO;
 396			goto err_count;
 397		}
 398	}
 399
 400	rx->recv_count = ipoib_recvq_size;
 401
 402	kfree(t);
 403
 404	return 0;
 405
 406err_count:
 407	spin_lock_irq(&priv->lock);
 408	--priv->cm.nonsrq_conn_qp;
 409	spin_unlock_irq(&priv->lock);
 410
 411err_free:
 412	kfree(t);
 413
 414err_free_1:
 415	ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 416
 417	return ret;
 418}
 419
 420static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 421			     struct ib_qp *qp,
 422			     const struct ib_cm_req_event_param *req,
 423			     unsigned int psn)
 424{
 425	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 426	struct ipoib_cm_data data = {};
 427	struct ib_cm_rep_param rep = {};
 428
 429	data.qpn = cpu_to_be32(priv->qp->qp_num);
 430	data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 431
 432	rep.private_data = &data;
 433	rep.private_data_len = sizeof(data);
 434	rep.flow_control = 0;
 435	rep.rnr_retry_count = req->rnr_retry_count;
 436	rep.srq = ipoib_cm_has_srq(dev);
 437	rep.qp_num = qp->qp_num;
 438	rep.starting_psn = psn;
 439	return ib_send_cm_rep(cm_id, &rep);
 440}
 441
 442static int ipoib_cm_req_handler(struct ib_cm_id *cm_id,
 443				const struct ib_cm_event *event)
 444{
 445	struct net_device *dev = cm_id->context;
 446	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 447	struct ipoib_cm_rx *p;
 448	unsigned int psn;
 449	int ret;
 450
 451	ipoib_dbg(priv, "REQ arrived\n");
 452	p = kzalloc(sizeof(*p), GFP_KERNEL);
 453	if (!p)
 454		return -ENOMEM;
 455	p->dev = dev;
 456	p->id = cm_id;
 457	cm_id->context = p;
 458	p->state = IPOIB_CM_RX_LIVE;
 459	p->jiffies = jiffies;
 460	INIT_LIST_HEAD(&p->list);
 461
 462	p->qp = ipoib_cm_create_rx_qp(dev, p);
 463	if (IS_ERR(p->qp)) {
 464		ret = PTR_ERR(p->qp);
 465		goto err_qp;
 466	}
 467
 468	psn = get_random_u32() & 0xffffff;
 469	ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 470	if (ret)
 471		goto err_modify;
 472
 473	if (!ipoib_cm_has_srq(dev)) {
 474		ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 475		if (ret)
 476			goto err_modify;
 477	}
 478
 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);
 488
 489	ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 490	if (ret) {
 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");
 494	}
 495	return 0;
 496
 497err_modify:
 498	ib_destroy_qp(p->qp);
 499err_qp:
 500	kfree(p);
 501	return ret;
 502}
 503
 504static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 505			       const struct ib_cm_event *event)
 506{
 507	struct ipoib_cm_rx *p;
 508	struct ipoib_dev_priv *priv;
 509
 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);
 515		fallthrough;
 516	case IB_CM_REJ_RECEIVED:
 517		p = cm_id->context;
 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");
 521		fallthrough;
 522	default:
 523		return 0;
 524	}
 525}
 526/* Adjust length of skb with fragments to match received data */
 527static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 528			  unsigned int length, struct sk_buff *toskb)
 529{
 530	int i, num_frags;
 531	unsigned int size;
 532
 533	/* put header into skb */
 534	size = min(length, hdr_space);
 535	skb->tail += size;
 536	skb->len += size;
 537	length -= size;
 538
 539	num_frags = skb_shinfo(skb)->nr_frags;
 540	for (i = 0; i < num_frags; i++) {
 541		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 542
 543		if (length == 0) {
 544			/* don't need this page */
 545			skb_fill_page_desc(toskb, i, skb_frag_page(frag),
 546					   0, PAGE_SIZE);
 547			--skb_shinfo(skb)->nr_frags;
 548		} else {
 549			size = min_t(unsigned int, length, PAGE_SIZE);
 550
 551			skb_frag_size_set(frag, size);
 552			skb->data_len += size;
 553			skb->truesize += size;
 554			skb->len += size;
 555			length -= size;
 556		}
 557	}
 558}
 559
 560void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 561{
 562	struct ipoib_dev_priv *priv = 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;
 567	unsigned long flags;
 568	u64 mapping[IPOIB_CM_RX_SG];
 569	int frags;
 570	int has_srq;
 571	struct sk_buff *small_skb;
 572
 573	ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 574		       wr_id, wc->status);
 575
 576	if (unlikely(wr_id >= ipoib_recvq_size)) {
 577		if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 578			spin_lock_irqsave(&priv->lock, flags);
 579			list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 580			ipoib_cm_start_rx_drain(priv);
 581			queue_work(priv->wq, &priv->cm.rx_reap_task);
 582			spin_unlock_irqrestore(&priv->lock, flags);
 583		} else
 584			ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 585				   wr_id, ipoib_recvq_size);
 586		return;
 587	}
 588
 589	p = wc->qp->qp_context;
 590
 591	has_srq = ipoib_cm_has_srq(dev);
 592	rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 593
 594	skb = rx_ring[wr_id].skb;
 595
 596	if (unlikely(wc->status != IB_WC_SUCCESS)) {
 597		ipoib_dbg(priv,
 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;
 601		if (has_srq)
 602			goto repost;
 603		else {
 604			if (!--p->recv_count) {
 605				spin_lock_irqsave(&priv->lock, flags);
 606				list_move(&p->list, &priv->cm.rx_reap_list);
 607				spin_unlock_irqrestore(&priv->lock, flags);
 608				queue_work(priv->wq, &priv->cm.rx_reap_task);
 609			}
 610			return;
 611		}
 612	}
 613
 614	if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 615		if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 616			spin_lock_irqsave(&priv->lock, flags);
 617			p->jiffies = jiffies;
 618			/* 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);
 623		}
 624	}
 625
 626	if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 627		int dlen = wc->byte_len;
 628
 629		small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
 630		if (small_skb) {
 631			skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
 632			ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 633						   dlen, DMA_FROM_DEVICE);
 634			skb_copy_from_linear_data(skb, small_skb->data, dlen);
 635			ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 636						      dlen, DMA_FROM_DEVICE);
 637			skb_put(small_skb, dlen);
 638			skb = small_skb;
 639			goto copied;
 640		}
 641	}
 642
 643	frags = PAGE_ALIGN(wc->byte_len -
 644			   min_t(u32, wc->byte_len, IPOIB_CM_HEAD_SIZE)) /
 645		PAGE_SIZE;
 646
 647	newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 648				       mapping, GFP_ATOMIC);
 649	if (unlikely(!newskb)) {
 650		/*
 651		 * If we can't allocate a new RX buffer, dump
 652		 * this packet and reuse the old buffer.
 653		 */
 654		ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 655		++dev->stats.rx_dropped;
 656		goto repost;
 657	}
 658
 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));
 661
 662	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 663		       wc->byte_len, wc->slid);
 664
 665	skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 666
 667copied:
 668	skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 669	skb_add_pseudo_hdr(skb);
 670
 671	++dev->stats.rx_packets;
 672	dev->stats.rx_bytes += skb->len;
 673
 674	skb->dev = dev;
 675	/* XXX get correct PACKET_ type here */
 676	skb->pkt_type = PACKET_HOST;
 677	netif_receive_skb(skb);
 678
 679repost:
 680	if (has_srq) {
 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);
 684	} else {
 685		if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 686							  &priv->cm.rx_wr,
 687							  priv->cm.rx_sge,
 688							  wr_id))) {
 689			--p->recv_count;
 690			ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 691				   "for buf %d\n", wr_id);
 692		}
 693	}
 694}
 695
 696static inline int post_send(struct ipoib_dev_priv *priv,
 697			    struct ipoib_cm_tx *tx,
 698			    unsigned int wr_id,
 699			    struct ipoib_tx_buf *tx_req)
 700{
 701	ipoib_build_sge(priv, tx_req);
 702
 703	priv->tx_wr.wr.wr_id	= wr_id | IPOIB_OP_CM;
 704
 705	return ib_post_send(tx->qp, &priv->tx_wr.wr, NULL);
 706}
 707
 708void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 709{
 710	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 711	struct ipoib_tx_buf *tx_req;
 712	int rc;
 713	unsigned int usable_sge = tx->max_send_sge - !!skb_headlen(skb);
 714
 715	if (unlikely(skb->len > tx->mtu)) {
 716		ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 717			   skb->len, tx->mtu);
 718		++dev->stats.tx_dropped;
 719		++dev->stats.tx_errors;
 720		ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 721		return;
 722	}
 723	if (skb_shinfo(skb)->nr_frags > usable_sge) {
 724		if (skb_linearize(skb) < 0) {
 725			ipoib_warn(priv, "skb could not be linearized\n");
 726			++dev->stats.tx_dropped;
 727			++dev->stats.tx_errors;
 728			dev_kfree_skb_any(skb);
 729			return;
 730		}
 731		/* Does skb_linearize return ok without reducing nr_frags? */
 732		if (skb_shinfo(skb)->nr_frags > usable_sge) {
 733			ipoib_warn(priv, "too many frags after skb linearize\n");
 734			++dev->stats.tx_dropped;
 735			++dev->stats.tx_errors;
 736			dev_kfree_skb_any(skb);
 737			return;
 738		}
 739	}
 740	ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 741		       tx->tx_head, skb->len, tx->qp->qp_num);
 742
 743	/*
 744	 * We put the skb into the tx_ring _before_ we call post_send()
 745	 * because it's entirely possible that the completion handler will
 746	 * run before we execute anything after the post_send().  That
 747	 * means we have to make sure everything is properly recorded and
 748	 * our state is consistent before we call post_send().
 749	 */
 750	tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 751	tx_req->skb = skb;
 752
 753	if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 754		++dev->stats.tx_errors;
 755		dev_kfree_skb_any(skb);
 756		return;
 757	}
 758
 759	if ((priv->global_tx_head - priv->global_tx_tail) ==
 760	    ipoib_sendq_size - 1) {
 761		ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 762			  tx->qp->qp_num);
 763		netif_stop_queue(dev);
 764	}
 765
 766	skb_orphan(skb);
 767	skb_dst_drop(skb);
 768
 769	if (netif_queue_stopped(dev)) {
 770		rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
 771				      IB_CQ_REPORT_MISSED_EVENTS);
 772		if (unlikely(rc < 0))
 773			ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
 774		else if (rc)
 775			napi_schedule(&priv->send_napi);
 776	}
 777
 778	rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 779	if (unlikely(rc)) {
 780		ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
 781		++dev->stats.tx_errors;
 782		ipoib_dma_unmap_tx(priv, tx_req);
 783		dev_kfree_skb_any(skb);
 784
 785		if (netif_queue_stopped(dev))
 786			netif_wake_queue(dev);
 787	} else {
 788		netif_trans_update(dev);
 789		++tx->tx_head;
 790		++priv->global_tx_head;
 791	}
 792}
 793
 794void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 795{
 796	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 797	struct ipoib_cm_tx *tx = wc->qp->qp_context;
 798	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 799	struct ipoib_tx_buf *tx_req;
 800	unsigned long flags;
 801
 802	ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 803		       wr_id, wc->status);
 804
 805	if (unlikely(wr_id >= ipoib_sendq_size)) {
 806		ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 807			   wr_id, ipoib_sendq_size);
 808		return;
 809	}
 810
 811	tx_req = &tx->tx_ring[wr_id];
 812
 813	ipoib_dma_unmap_tx(priv, tx_req);
 814
 815	/* FIXME: is this right? Shouldn't we only increment on success? */
 816	++dev->stats.tx_packets;
 817	dev->stats.tx_bytes += tx_req->skb->len;
 818
 819	dev_kfree_skb_any(tx_req->skb);
 820
 821	netif_tx_lock(dev);
 822
 823	++tx->tx_tail;
 824	++priv->global_tx_tail;
 825
 826	if (unlikely(netif_queue_stopped(dev) &&
 827		     ((priv->global_tx_head - priv->global_tx_tail) <=
 828		      ipoib_sendq_size >> 1) &&
 829		     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
 830		netif_wake_queue(dev);
 831
 832	if (wc->status != IB_WC_SUCCESS &&
 833	    wc->status != IB_WC_WR_FLUSH_ERR) {
 834		struct ipoib_neigh *neigh;
 835
 836		/* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
 837		 * so don't make waves.
 838		 */
 839		if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
 840		    wc->status == IB_WC_RETRY_EXC_ERR)
 841			ipoib_dbg(priv,
 842				  "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
 843				   __func__, wc->status, wr_id, wc->vendor_err);
 844		else
 845			ipoib_warn(priv,
 846				    "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
 847				   __func__, wc->status, wr_id, wc->vendor_err);
 848
 849		spin_lock_irqsave(&priv->lock, flags);
 850		neigh = tx->neigh;
 851
 852		if (neigh) {
 853			neigh->cm = NULL;
 854			ipoib_neigh_free(neigh);
 855
 856			tx->neigh = NULL;
 857		}
 858
 859		if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 860			list_move(&tx->list, &priv->cm.reap_list);
 861			queue_work(priv->wq, &priv->cm.reap_task);
 862		}
 863
 864		clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 865
 866		spin_unlock_irqrestore(&priv->lock, flags);
 867	}
 868
 869	netif_tx_unlock(dev);
 870}
 871
 872int ipoib_cm_dev_open(struct net_device *dev)
 873{
 874	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 875	int ret;
 876
 877	if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 878		return 0;
 879
 880	priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 881	if (IS_ERR(priv->cm.id)) {
 882		pr_warn("%s: failed to create CM ID\n", priv->ca->name);
 883		ret = PTR_ERR(priv->cm.id);
 884		goto err_cm;
 885	}
 886
 887	ret = ib_cm_listen(priv->cm.id,
 888			   cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num));
 889	if (ret) {
 890		pr_warn("%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 891			IPOIB_CM_IETF_ID | priv->qp->qp_num);
 892		goto err_listen;
 893	}
 894
 895	return 0;
 896
 897err_listen:
 898	ib_destroy_cm_id(priv->cm.id);
 899err_cm:
 900	priv->cm.id = NULL;
 901	return ret;
 902}
 903
 904static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 905{
 906	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 907	struct ipoib_cm_rx *rx, *n;
 908	LIST_HEAD(list);
 909
 910	spin_lock_irq(&priv->lock);
 911	list_splice_init(&priv->cm.rx_reap_list, &list);
 912	spin_unlock_irq(&priv->lock);
 913
 914	list_for_each_entry_safe(rx, n, &list, list) {
 915		ib_destroy_cm_id(rx->id);
 916		ib_destroy_qp(rx->qp);
 917		if (!ipoib_cm_has_srq(dev)) {
 918			ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 919			spin_lock_irq(&priv->lock);
 920			--priv->cm.nonsrq_conn_qp;
 921			spin_unlock_irq(&priv->lock);
 922		}
 923		kfree(rx);
 924	}
 925}
 926
 927void ipoib_cm_dev_stop(struct net_device *dev)
 928{
 929	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 930	struct ipoib_cm_rx *p;
 931	unsigned long begin;
 932	int ret;
 933
 934	if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 935		return;
 936
 937	ib_destroy_cm_id(priv->cm.id);
 938	priv->cm.id = NULL;
 939
 940	spin_lock_irq(&priv->lock);
 941	while (!list_empty(&priv->cm.passive_ids)) {
 942		p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 943		list_move(&p->list, &priv->cm.rx_error_list);
 944		p->state = IPOIB_CM_RX_ERROR;
 945		spin_unlock_irq(&priv->lock);
 946		ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 947		if (ret)
 948			ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 949		spin_lock_irq(&priv->lock);
 950	}
 951
 952	/* Wait for all RX to be drained */
 953	begin = jiffies;
 954
 955	while (!list_empty(&priv->cm.rx_error_list) ||
 956	       !list_empty(&priv->cm.rx_flush_list) ||
 957	       !list_empty(&priv->cm.rx_drain_list)) {
 958		if (time_after(jiffies, begin + 5 * HZ)) {
 959			ipoib_warn(priv, "RX drain timing out\n");
 960
 961			/*
 962			 * assume the HW is wedged and just free up everything.
 963			 */
 964			list_splice_init(&priv->cm.rx_flush_list,
 965					 &priv->cm.rx_reap_list);
 966			list_splice_init(&priv->cm.rx_error_list,
 967					 &priv->cm.rx_reap_list);
 968			list_splice_init(&priv->cm.rx_drain_list,
 969					 &priv->cm.rx_reap_list);
 970			break;
 971		}
 972		spin_unlock_irq(&priv->lock);
 973		usleep_range(1000, 2000);
 974		ipoib_drain_cq(dev);
 975		spin_lock_irq(&priv->lock);
 976	}
 977
 978	spin_unlock_irq(&priv->lock);
 979
 980	ipoib_cm_free_rx_reap_list(dev);
 981
 982	cancel_delayed_work(&priv->cm.stale_task);
 983}
 984
 985static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id,
 986				const struct ib_cm_event *event)
 987{
 988	struct ipoib_cm_tx *p = cm_id->context;
 989	struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 990	struct ipoib_cm_data *data = event->private_data;
 991	struct sk_buff_head skqueue;
 992	struct ib_qp_attr qp_attr;
 993	int qp_attr_mask, ret;
 994	struct sk_buff *skb;
 995
 996	p->mtu = be32_to_cpu(data->mtu);
 997
 998	if (p->mtu <= IPOIB_ENCAP_LEN) {
 999		ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
1000			   p->mtu, IPOIB_ENCAP_LEN);
1001		return -EINVAL;
1002	}
1003
1004	qp_attr.qp_state = IB_QPS_RTR;
1005	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1006	if (ret) {
1007		ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
1008		return ret;
1009	}
1010
1011	qp_attr.rq_psn = 0 /* FIXME */;
1012	ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1013	if (ret) {
1014		ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1015		return ret;
1016	}
1017
1018	qp_attr.qp_state = IB_QPS_RTS;
1019	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1020	if (ret) {
1021		ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1022		return ret;
1023	}
1024	ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1025	if (ret) {
1026		ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1027		return ret;
1028	}
1029
1030	skb_queue_head_init(&skqueue);
1031
1032	netif_tx_lock_bh(p->dev);
1033	spin_lock_irq(&priv->lock);
1034	set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1035	if (p->neigh)
1036		while ((skb = __skb_dequeue(&p->neigh->queue)))
1037			__skb_queue_tail(&skqueue, skb);
1038	spin_unlock_irq(&priv->lock);
1039	netif_tx_unlock_bh(p->dev);
1040
1041	while ((skb = __skb_dequeue(&skqueue))) {
1042		skb->dev = p->dev;
1043		ret = dev_queue_xmit(skb);
1044		if (ret)
1045			ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1046				   __func__, ret);
1047	}
1048
1049	ret = ib_send_cm_rtu(cm_id, NULL, 0);
1050	if (ret) {
1051		ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1052		return ret;
1053	}
1054	return 0;
1055}
1056
1057static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1058{
1059	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1060	struct ib_qp_init_attr attr = {
1061		.send_cq		= priv->send_cq,
1062		.recv_cq		= priv->recv_cq,
1063		.srq			= priv->cm.srq,
1064		.cap.max_send_wr	= ipoib_sendq_size,
1065		.cap.max_send_sge	= 1,
1066		.sq_sig_type		= IB_SIGNAL_ALL_WR,
1067		.qp_type		= IB_QPT_RC,
1068		.qp_context		= tx,
1069		.create_flags		= 0
1070	};
1071	struct ib_qp *tx_qp;
1072
1073	if (dev->features & NETIF_F_SG)
1074		attr.cap.max_send_sge = min_t(u32, priv->ca->attrs.max_send_sge,
1075					      MAX_SKB_FRAGS + 1);
1076
1077	tx_qp = ib_create_qp(priv->pd, &attr);
1078	tx->max_send_sge = attr.cap.max_send_sge;
1079	return tx_qp;
1080}
1081
1082static int ipoib_cm_send_req(struct net_device *dev,
1083			     struct ib_cm_id *id, struct ib_qp *qp,
1084			     u32 qpn,
1085			     struct sa_path_rec *pathrec)
1086{
1087	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1088	struct ipoib_cm_data data = {};
1089	struct ib_cm_req_param req = {};
1090
1091	data.qpn = cpu_to_be32(priv->qp->qp_num);
1092	data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1093
1094	req.primary_path		= pathrec;
1095	req.alternate_path		= NULL;
1096	req.service_id			= cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1097	req.qp_num			= qp->qp_num;
1098	req.qp_type			= qp->qp_type;
1099	req.private_data		= &data;
1100	req.private_data_len		= sizeof(data);
1101	req.flow_control		= 0;
1102
1103	req.starting_psn		= 0; /* FIXME */
1104
1105	/*
1106	 * Pick some arbitrary defaults here; we could make these
1107	 * module parameters if anyone cared about setting them.
1108	 */
1109	req.responder_resources		= 4;
1110	req.remote_cm_response_timeout	= 20;
1111	req.local_cm_response_timeout	= 20;
1112	req.retry_count			= 0; /* RFC draft warns against retries */
1113	req.rnr_retry_count		= 0; /* RFC draft warns against retries */
1114	req.max_cm_retries		= 15;
1115	req.srq				= ipoib_cm_has_srq(dev);
1116	return ib_send_cm_req(id, &req);
1117}
1118
1119static int ipoib_cm_modify_tx_init(struct net_device *dev,
1120				  struct ib_cm_id *cm_id, struct ib_qp *qp)
1121{
1122	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1123	struct ib_qp_attr qp_attr;
1124	int qp_attr_mask, ret;
1125
1126	qp_attr.pkey_index = priv->pkey_index;
1127	qp_attr.qp_state = IB_QPS_INIT;
1128	qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1129	qp_attr.port_num = priv->port;
1130	qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1131
1132	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1133	if (ret) {
1134		ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1135		return ret;
1136	}
1137	return 0;
1138}
1139
1140static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1141			    struct sa_path_rec *pathrec)
1142{
1143	struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1144	unsigned int noio_flag;
1145	int ret;
1146
1147	noio_flag = memalloc_noio_save();
1148	p->tx_ring = vzalloc(array_size(ipoib_sendq_size, sizeof(*p->tx_ring)));
1149	if (!p->tx_ring) {
1150		memalloc_noio_restore(noio_flag);
1151		ret = -ENOMEM;
1152		goto err_tx;
1153	}
1154
1155	p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1156	memalloc_noio_restore(noio_flag);
1157	if (IS_ERR(p->qp)) {
1158		ret = PTR_ERR(p->qp);
1159		ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1160		goto err_qp;
1161	}
1162
1163	p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1164	if (IS_ERR(p->id)) {
1165		ret = PTR_ERR(p->id);
1166		ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1167		goto err_id;
1168	}
1169
1170	ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1171	if (ret) {
1172		ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1173		goto err_modify_send;
1174	}
1175
1176	ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1177	if (ret) {
1178		ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1179		goto err_modify_send;
1180	}
1181
1182	ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1183		  p->qp->qp_num, pathrec->dgid.raw, qpn);
1184
1185	return 0;
1186
1187err_modify_send:
1188	ib_destroy_cm_id(p->id);
1189err_id:
1190	p->id = NULL;
1191	ib_destroy_qp(p->qp);
1192err_qp:
1193	p->qp = NULL;
1194	vfree(p->tx_ring);
1195err_tx:
1196	return ret;
1197}
1198
1199static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1200{
1201	struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1202	struct ipoib_tx_buf *tx_req;
1203	unsigned long begin;
1204
1205	ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1206		  p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1207
1208	if (p->id)
1209		ib_destroy_cm_id(p->id);
1210
1211	if (p->tx_ring) {
1212		/* Wait for all sends to complete */
1213		begin = jiffies;
1214		while ((int) p->tx_tail - (int) p->tx_head < 0) {
1215			if (time_after(jiffies, begin + 5 * HZ)) {
1216				ipoib_warn(priv, "timing out; %d sends not completed\n",
1217					   p->tx_head - p->tx_tail);
1218				goto timeout;
1219			}
1220
1221			usleep_range(1000, 2000);
1222		}
1223	}
1224
1225timeout:
1226
1227	while ((int) p->tx_tail - (int) p->tx_head < 0) {
1228		tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1229		ipoib_dma_unmap_tx(priv, tx_req);
1230		dev_kfree_skb_any(tx_req->skb);
1231		netif_tx_lock_bh(p->dev);
1232		++p->tx_tail;
1233		++priv->global_tx_tail;
1234		if (unlikely((priv->global_tx_head - priv->global_tx_tail) <=
1235			     ipoib_sendq_size >> 1) &&
1236		    netif_queue_stopped(p->dev) &&
1237		    test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1238			netif_wake_queue(p->dev);
1239		netif_tx_unlock_bh(p->dev);
1240	}
1241
1242	if (p->qp)
1243		ib_destroy_qp(p->qp);
1244
1245	vfree(p->tx_ring);
1246	kfree(p);
1247}
1248
1249static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1250			       const struct ib_cm_event *event)
1251{
1252	struct ipoib_cm_tx *tx = cm_id->context;
1253	struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1254	struct net_device *dev = priv->dev;
1255	struct ipoib_neigh *neigh;
1256	unsigned long flags;
1257	int ret;
1258
1259	switch (event->event) {
1260	case IB_CM_DREQ_RECEIVED:
1261		ipoib_dbg(priv, "DREQ received.\n");
1262		ib_send_cm_drep(cm_id, NULL, 0);
1263		break;
1264	case IB_CM_REP_RECEIVED:
1265		ipoib_dbg(priv, "REP received.\n");
1266		ret = ipoib_cm_rep_handler(cm_id, event);
1267		if (ret)
1268			ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1269				       NULL, 0, NULL, 0);
1270		break;
1271	case IB_CM_REQ_ERROR:
1272	case IB_CM_REJ_RECEIVED:
1273	case IB_CM_TIMEWAIT_EXIT:
1274		ipoib_dbg(priv, "CM error %d.\n", event->event);
1275		netif_tx_lock_bh(dev);
1276		spin_lock_irqsave(&priv->lock, flags);
1277		neigh = tx->neigh;
1278
1279		if (neigh) {
1280			neigh->cm = NULL;
1281			ipoib_neigh_free(neigh);
1282
1283			tx->neigh = NULL;
1284		}
1285
1286		if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1287			list_move(&tx->list, &priv->cm.reap_list);
1288			queue_work(priv->wq, &priv->cm.reap_task);
1289		}
1290
1291		spin_unlock_irqrestore(&priv->lock, flags);
1292		netif_tx_unlock_bh(dev);
1293		break;
1294	default:
1295		break;
1296	}
1297
1298	return 0;
1299}
1300
1301struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1302				       struct ipoib_neigh *neigh)
1303{
1304	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1305	struct ipoib_cm_tx *tx;
1306
1307	tx = kzalloc(sizeof(*tx), GFP_ATOMIC);
1308	if (!tx)
1309		return NULL;
1310
1311	neigh->cm = tx;
1312	tx->neigh = neigh;
1313	tx->dev = dev;
1314	list_add(&tx->list, &priv->cm.start_list);
1315	set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1316	queue_work(priv->wq, &priv->cm.start_task);
1317	return tx;
1318}
1319
1320void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1321{
1322	struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1323	unsigned long flags;
1324	if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1325		spin_lock_irqsave(&priv->lock, flags);
1326		list_move(&tx->list, &priv->cm.reap_list);
1327		queue_work(priv->wq, &priv->cm.reap_task);
1328		ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1329			  tx->neigh->daddr + 4);
1330		tx->neigh = NULL;
1331		spin_unlock_irqrestore(&priv->lock, flags);
1332	}
1333}
1334
1335#define QPN_AND_OPTIONS_OFFSET	4
1336
1337static void ipoib_cm_tx_start(struct work_struct *work)
1338{
1339	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1340						   cm.start_task);
1341	struct net_device *dev = priv->dev;
1342	struct ipoib_neigh *neigh;
1343	struct ipoib_cm_tx *p;
1344	unsigned long flags;
1345	struct ipoib_path *path;
1346	int ret;
1347
1348	struct sa_path_rec pathrec;
1349	u32 qpn;
1350
1351	netif_tx_lock_bh(dev);
1352	spin_lock_irqsave(&priv->lock, flags);
1353
1354	while (!list_empty(&priv->cm.start_list)) {
1355		p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1356		list_del_init(&p->list);
1357		neigh = p->neigh;
1358
1359		qpn = IPOIB_QPN(neigh->daddr);
1360		/*
1361		 * As long as the search is with these 2 locks,
1362		 * path existence indicates its validity.
1363		 */
1364		path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1365		if (!path) {
1366			pr_info("%s ignore not valid path %pI6\n",
1367				__func__,
1368				neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1369			goto free_neigh;
1370		}
1371		memcpy(&pathrec, &path->pathrec, sizeof(pathrec));
1372
1373		spin_unlock_irqrestore(&priv->lock, flags);
1374		netif_tx_unlock_bh(dev);
1375
1376		ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1377
1378		netif_tx_lock_bh(dev);
1379		spin_lock_irqsave(&priv->lock, flags);
1380
1381		if (ret) {
1382free_neigh:
1383			neigh = p->neigh;
1384			if (neigh) {
1385				neigh->cm = NULL;
1386				ipoib_neigh_free(neigh);
1387			}
1388			list_del(&p->list);
1389			kfree(p);
1390		}
1391	}
1392
1393	spin_unlock_irqrestore(&priv->lock, flags);
1394	netif_tx_unlock_bh(dev);
1395}
1396
1397static void ipoib_cm_tx_reap(struct work_struct *work)
1398{
1399	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1400						   cm.reap_task);
1401	struct net_device *dev = priv->dev;
1402	struct ipoib_cm_tx *p;
1403	unsigned long flags;
1404
1405	netif_tx_lock_bh(dev);
1406	spin_lock_irqsave(&priv->lock, flags);
1407
1408	while (!list_empty(&priv->cm.reap_list)) {
1409		p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1410		list_del_init(&p->list);
1411		spin_unlock_irqrestore(&priv->lock, flags);
1412		netif_tx_unlock_bh(dev);
1413		ipoib_cm_tx_destroy(p);
1414		netif_tx_lock_bh(dev);
1415		spin_lock_irqsave(&priv->lock, flags);
1416	}
1417
1418	spin_unlock_irqrestore(&priv->lock, flags);
1419	netif_tx_unlock_bh(dev);
1420}
1421
1422static void ipoib_cm_skb_reap(struct work_struct *work)
1423{
1424	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1425						   cm.skb_task);
1426	struct net_device *dev = priv->dev;
1427	struct sk_buff *skb;
1428	unsigned long flags;
1429	unsigned int mtu = priv->mcast_mtu;
1430
1431	netif_tx_lock_bh(dev);
1432	spin_lock_irqsave(&priv->lock, flags);
1433
1434	while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1435		spin_unlock_irqrestore(&priv->lock, flags);
1436		netif_tx_unlock_bh(dev);
1437
1438		if (skb->protocol == htons(ETH_P_IP)) {
1439			memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
1440			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1441		}
1442#if IS_ENABLED(CONFIG_IPV6)
1443		else if (skb->protocol == htons(ETH_P_IPV6)) {
1444			memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
1445			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1446		}
1447#endif
1448		dev_kfree_skb_any(skb);
1449
1450		netif_tx_lock_bh(dev);
1451		spin_lock_irqsave(&priv->lock, flags);
1452	}
1453
1454	spin_unlock_irqrestore(&priv->lock, flags);
1455	netif_tx_unlock_bh(dev);
1456}
1457
1458void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1459			   unsigned int mtu)
1460{
1461	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1462	int e = skb_queue_empty(&priv->cm.skb_queue);
1463
1464	skb_dst_update_pmtu(skb, mtu);
1465
1466	skb_queue_tail(&priv->cm.skb_queue, skb);
1467	if (e)
1468		queue_work(priv->wq, &priv->cm.skb_task);
1469}
1470
1471static void ipoib_cm_rx_reap(struct work_struct *work)
1472{
1473	ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1474						cm.rx_reap_task)->dev);
1475}
1476
1477static void ipoib_cm_stale_task(struct work_struct *work)
1478{
1479	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1480						   cm.stale_task.work);
1481	struct ipoib_cm_rx *p;
1482	int ret;
1483
1484	spin_lock_irq(&priv->lock);
1485	while (!list_empty(&priv->cm.passive_ids)) {
1486		/* List is sorted by LRU, start from tail,
1487		 * stop when we see a recently used entry */
1488		p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1489		if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1490			break;
1491		list_move(&p->list, &priv->cm.rx_error_list);
1492		p->state = IPOIB_CM_RX_ERROR;
1493		spin_unlock_irq(&priv->lock);
1494		ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1495		if (ret)
1496			ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1497		spin_lock_irq(&priv->lock);
1498	}
1499
1500	if (!list_empty(&priv->cm.passive_ids))
1501		queue_delayed_work(priv->wq,
1502				   &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1503	spin_unlock_irq(&priv->lock);
1504}
1505
1506static ssize_t mode_show(struct device *d, struct device_attribute *attr,
1507			 char *buf)
1508{
1509	struct net_device *dev = to_net_dev(d);
1510	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1511
1512	if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1513		return sysfs_emit(buf, "connected\n");
1514	else
1515		return sysfs_emit(buf, "datagram\n");
1516}
1517
1518static ssize_t mode_store(struct device *d, struct device_attribute *attr,
1519			  const char *buf, size_t count)
1520{
1521	struct net_device *dev = to_net_dev(d);
1522	int ret;
1523
1524	if (!rtnl_trylock()) {
1525		return restart_syscall();
1526	}
1527
1528	if (dev->reg_state != NETREG_REGISTERED) {
1529		rtnl_unlock();
1530		return -EPERM;
1531	}
1532
1533	ret = ipoib_set_mode(dev, buf);
1534
1535	/* The assumption is that the function ipoib_set_mode returned
1536	 * with the rtnl held by it, if not the value -EBUSY returned,
1537	 * then no need to rtnl_unlock
1538	 */
1539	if (ret != -EBUSY)
1540		rtnl_unlock();
1541
1542	return (!ret || ret == -EBUSY) ? count : ret;
1543}
1544
1545static DEVICE_ATTR_RW(mode);
1546
1547int ipoib_cm_add_mode_attr(struct net_device *dev)
1548{
1549	return device_create_file(&dev->dev, &dev_attr_mode);
1550}
1551
1552static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1553{
1554	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1555	struct ib_srq_init_attr srq_init_attr = {
1556		.srq_type = IB_SRQT_BASIC,
1557		.attr = {
1558			.max_wr  = ipoib_recvq_size,
1559			.max_sge = max_sge
1560		}
1561	};
1562
1563	priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1564	if (IS_ERR(priv->cm.srq)) {
1565		if (PTR_ERR(priv->cm.srq) != -EOPNOTSUPP)
1566			pr_warn("%s: failed to allocate SRQ, error %ld\n",
1567			       priv->ca->name, PTR_ERR(priv->cm.srq));
1568		priv->cm.srq = NULL;
1569		return;
1570	}
1571
1572	priv->cm.srq_ring = vzalloc(array_size(ipoib_recvq_size,
1573					       sizeof(*priv->cm.srq_ring)));
1574	if (!priv->cm.srq_ring) {
1575		ib_destroy_srq(priv->cm.srq);
1576		priv->cm.srq = NULL;
1577		return;
1578	}
1579
1580}
1581
1582int ipoib_cm_dev_init(struct net_device *dev)
1583{
1584	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1585	int max_srq_sge, i;
1586	u8 addr;
1587
1588	INIT_LIST_HEAD(&priv->cm.passive_ids);
1589	INIT_LIST_HEAD(&priv->cm.reap_list);
1590	INIT_LIST_HEAD(&priv->cm.start_list);
1591	INIT_LIST_HEAD(&priv->cm.rx_error_list);
1592	INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1593	INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1594	INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1595	INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1596	INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1597	INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1598	INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1599	INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1600
1601	skb_queue_head_init(&priv->cm.skb_queue);
1602
1603	ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1604
1605	max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1606	ipoib_cm_create_srq(dev, max_srq_sge);
1607	if (ipoib_cm_has_srq(dev)) {
1608		priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1609		priv->cm.num_frags  = max_srq_sge;
1610		ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1611			  priv->cm.max_cm_mtu, priv->cm.num_frags);
1612	} else {
1613		priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1614		priv->cm.num_frags  = IPOIB_CM_RX_SG;
1615	}
1616
1617	ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1618
1619	if (ipoib_cm_has_srq(dev)) {
1620		for (i = 0; i < ipoib_recvq_size; ++i) {
1621			if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1622						   priv->cm.num_frags - 1,
1623						   priv->cm.srq_ring[i].mapping,
1624						   GFP_KERNEL)) {
1625				ipoib_warn(priv, "failed to allocate "
1626					   "receive buffer %d\n", i);
1627				ipoib_cm_dev_cleanup(dev);
1628				return -ENOMEM;
1629			}
1630
1631			if (ipoib_cm_post_receive_srq(dev, i)) {
1632				ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1633					   "failed for buf %d\n", i);
1634				ipoib_cm_dev_cleanup(dev);
1635				return -EIO;
1636			}
1637		}
1638	}
1639
1640	addr = IPOIB_FLAGS_RC;
1641	dev_addr_mod(dev, 0, &addr, 1);
1642	return 0;
1643}
1644
1645void ipoib_cm_dev_cleanup(struct net_device *dev)
1646{
1647	struct ipoib_dev_priv *priv = ipoib_priv(dev);
1648
1649	if (!priv->cm.srq)
1650		return;
1651
1652	ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1653
1654	ib_destroy_srq(priv->cm.srq);
1655	priv->cm.srq = NULL;
1656	if (!priv->cm.srq_ring)
1657		return;
1658
1659	ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1660	priv->cm.srq_ring = NULL;
1661}