1 /* 2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <rdma/ib_cm.h> 34 #include <net/dst.h> 35 #include <net/icmp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/delay.h> 38 #include <linux/slab.h> 39 #include <linux/vmalloc.h> 40 #include <linux/moduleparam.h> 41 42 #include "ipoib.h" 43 44 int ipoib_max_conn_qp = 128; 45 46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 47 MODULE_PARM_DESC(max_nonsrq_conn_qp, 48 "Max number of connected-mode QPs per interface " 49 "(applied only if shared receive queue is not available)"); 50 51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 52 static int data_debug_level; 53 54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 55 MODULE_PARM_DESC(cm_data_debug_level, 56 "Enable data path debug tracing for connected mode if > 0"); 57 #endif 58 59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 60 61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 64 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 65 66 static struct ib_qp_attr ipoib_cm_err_attr = { 67 .qp_state = IB_QPS_ERR 68 }; 69 70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 71 72 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 73 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 74 .opcode = IB_WR_SEND, 75 }; 76 77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 78 struct ib_cm_event *event); 79 80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 81 u64 mapping[IPOIB_CM_RX_SG]) 82 { 83 int i; 84 85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 86 87 for (i = 0; i < frags; ++i) 88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 89 } 90 91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 92 { 93 struct ipoib_dev_priv *priv = netdev_priv(dev); 94 struct ib_recv_wr *bad_wr; 95 int i, ret; 96 97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 98 99 for (i = 0; i < priv->cm.num_frags; ++i) 100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 101 102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 103 if (unlikely(ret)) { 104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 106 priv->cm.srq_ring[id].mapping); 107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 108 priv->cm.srq_ring[id].skb = NULL; 109 } 110 111 return ret; 112 } 113 114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 115 struct ipoib_cm_rx *rx, 116 struct ib_recv_wr *wr, 117 struct ib_sge *sge, int id) 118 { 119 struct ipoib_dev_priv *priv = netdev_priv(dev); 120 struct ib_recv_wr *bad_wr; 121 int i, ret; 122 123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 124 125 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 126 sge[i].addr = rx->rx_ring[id].mapping[i]; 127 128 ret = ib_post_recv(rx->qp, wr, &bad_wr); 129 if (unlikely(ret)) { 130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 132 rx->rx_ring[id].mapping); 133 dev_kfree_skb_any(rx->rx_ring[id].skb); 134 rx->rx_ring[id].skb = NULL; 135 } 136 137 return ret; 138 } 139 140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 141 struct ipoib_cm_rx_buf *rx_ring, 142 int id, int frags, 143 u64 mapping[IPOIB_CM_RX_SG], 144 gfp_t gfp) 145 { 146 struct ipoib_dev_priv *priv = netdev_priv(dev); 147 struct sk_buff *skb; 148 int i; 149 150 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 151 if (unlikely(!skb)) 152 return NULL; 153 154 /* 155 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 156 * IP header to a multiple of 16. 157 */ 158 skb_reserve(skb, 12); 159 160 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 161 DMA_FROM_DEVICE); 162 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 163 dev_kfree_skb_any(skb); 164 return NULL; 165 } 166 167 for (i = 0; i < frags; i++) { 168 struct page *page = alloc_page(gfp); 169 170 if (!page) 171 goto partial_error; 172 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 173 174 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 175 0, PAGE_SIZE, DMA_FROM_DEVICE); 176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 177 goto partial_error; 178 } 179 180 rx_ring[id].skb = skb; 181 return skb; 182 183 partial_error: 184 185 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 186 187 for (; i > 0; --i) 188 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 189 190 dev_kfree_skb_any(skb); 191 return NULL; 192 } 193 194 static void ipoib_cm_free_rx_ring(struct net_device *dev, 195 struct ipoib_cm_rx_buf *rx_ring) 196 { 197 struct ipoib_dev_priv *priv = netdev_priv(dev); 198 int i; 199 200 for (i = 0; i < ipoib_recvq_size; ++i) 201 if (rx_ring[i].skb) { 202 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 203 rx_ring[i].mapping); 204 dev_kfree_skb_any(rx_ring[i].skb); 205 } 206 207 vfree(rx_ring); 208 } 209 210 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 211 { 212 struct ib_send_wr *bad_wr; 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 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 227 ipoib_warn(priv, "failed to post drain wr\n"); 228 229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 230 } 231 232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 233 { 234 struct ipoib_cm_rx *p = ctx; 235 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 236 unsigned long flags; 237 238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 239 return; 240 241 spin_lock_irqsave(&priv->lock, flags); 242 list_move(&p->list, &priv->cm.rx_flush_list); 243 p->state = IPOIB_CM_RX_FLUSH; 244 ipoib_cm_start_rx_drain(priv); 245 spin_unlock_irqrestore(&priv->lock, flags); 246 } 247 248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 249 struct ipoib_cm_rx *p) 250 { 251 struct ipoib_dev_priv *priv = netdev_priv(dev); 252 struct ib_qp_init_attr attr = { 253 .event_handler = ipoib_cm_rx_event_handler, 254 .send_cq = priv->recv_cq, /* For drain WR */ 255 .recv_cq = priv->recv_cq, 256 .srq = priv->cm.srq, 257 .cap.max_send_wr = 1, /* For drain WR */ 258 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 259 .sq_sig_type = IB_SIGNAL_ALL_WR, 260 .qp_type = IB_QPT_RC, 261 .qp_context = p, 262 }; 263 264 if (!ipoib_cm_has_srq(dev)) { 265 attr.cap.max_recv_wr = ipoib_recvq_size; 266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 267 } 268 269 return ib_create_qp(priv->pd, &attr); 270 } 271 272 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 273 struct ib_cm_id *cm_id, struct ib_qp *qp, 274 unsigned psn) 275 { 276 struct ipoib_dev_priv *priv = netdev_priv(dev); 277 struct ib_qp_attr qp_attr; 278 int qp_attr_mask, ret; 279 280 qp_attr.qp_state = IB_QPS_INIT; 281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 282 if (ret) { 283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 284 return ret; 285 } 286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 287 if (ret) { 288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 289 return ret; 290 } 291 qp_attr.qp_state = IB_QPS_RTR; 292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 293 if (ret) { 294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 295 return ret; 296 } 297 qp_attr.rq_psn = psn; 298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 299 if (ret) { 300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 301 return ret; 302 } 303 304 /* 305 * Current Mellanox HCA firmware won't generate completions 306 * with error for drain WRs unless the QP has been moved to 307 * RTS first. This work-around leaves a window where a QP has 308 * moved to error asynchronously, but this will eventually get 309 * fixed in firmware, so let's not error out if modify QP 310 * fails. 311 */ 312 qp_attr.qp_state = IB_QPS_RTS; 313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 314 if (ret) { 315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 316 return 0; 317 } 318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 319 if (ret) { 320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 321 return 0; 322 } 323 324 return 0; 325 } 326 327 static void ipoib_cm_init_rx_wr(struct net_device *dev, 328 struct ib_recv_wr *wr, 329 struct ib_sge *sge) 330 { 331 struct ipoib_dev_priv *priv = netdev_priv(dev); 332 int i; 333 334 for (i = 0; i < priv->cm.num_frags; ++i) 335 sge[i].lkey = priv->mr->lkey; 336 337 sge[0].length = IPOIB_CM_HEAD_SIZE; 338 for (i = 1; i < priv->cm.num_frags; ++i) 339 sge[i].length = PAGE_SIZE; 340 341 wr->next = NULL; 342 wr->sg_list = sge; 343 wr->num_sge = priv->cm.num_frags; 344 } 345 346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 347 struct ipoib_cm_rx *rx) 348 { 349 struct ipoib_dev_priv *priv = netdev_priv(dev); 350 struct { 351 struct ib_recv_wr wr; 352 struct ib_sge sge[IPOIB_CM_RX_SG]; 353 } *t; 354 int ret; 355 int i; 356 357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 358 if (!rx->rx_ring) { 359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 360 priv->ca->name, ipoib_recvq_size); 361 return -ENOMEM; 362 } 363 364 t = kmalloc(sizeof *t, GFP_KERNEL); 365 if (!t) { 366 ret = -ENOMEM; 367 goto err_free; 368 } 369 370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 371 372 spin_lock_irq(&priv->lock); 373 374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 375 spin_unlock_irq(&priv->lock); 376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 377 ret = -EINVAL; 378 goto err_free; 379 } else 380 ++priv->cm.nonsrq_conn_qp; 381 382 spin_unlock_irq(&priv->lock); 383 384 for (i = 0; i < ipoib_recvq_size; ++i) { 385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 386 rx->rx_ring[i].mapping, 387 GFP_KERNEL)) { 388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 389 ret = -ENOMEM; 390 goto err_count; 391 } 392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 393 if (ret) { 394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 395 "failed for buf %d\n", i); 396 ret = -EIO; 397 goto err_count; 398 } 399 } 400 401 rx->recv_count = ipoib_recvq_size; 402 403 kfree(t); 404 405 return 0; 406 407 err_count: 408 spin_lock_irq(&priv->lock); 409 --priv->cm.nonsrq_conn_qp; 410 spin_unlock_irq(&priv->lock); 411 412 err_free: 413 kfree(t); 414 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 415 416 return ret; 417 } 418 419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 420 struct ib_qp *qp, struct ib_cm_req_event_param *req, 421 unsigned psn) 422 { 423 struct ipoib_dev_priv *priv = netdev_priv(dev); 424 struct ipoib_cm_data data = {}; 425 struct ib_cm_rep_param rep = {}; 426 427 data.qpn = cpu_to_be32(priv->qp->qp_num); 428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 429 430 rep.private_data = &data; 431 rep.private_data_len = sizeof data; 432 rep.flow_control = 0; 433 rep.rnr_retry_count = req->rnr_retry_count; 434 rep.srq = ipoib_cm_has_srq(dev); 435 rep.qp_num = qp->qp_num; 436 rep.starting_psn = psn; 437 return ib_send_cm_rep(cm_id, &rep); 438 } 439 440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 441 { 442 struct net_device *dev = cm_id->context; 443 struct ipoib_dev_priv *priv = netdev_priv(dev); 444 struct ipoib_cm_rx *p; 445 unsigned psn; 446 int ret; 447 448 ipoib_dbg(priv, "REQ arrived\n"); 449 p = kzalloc(sizeof *p, GFP_KERNEL); 450 if (!p) 451 return -ENOMEM; 452 p->dev = dev; 453 p->id = cm_id; 454 cm_id->context = p; 455 p->state = IPOIB_CM_RX_LIVE; 456 p->jiffies = jiffies; 457 INIT_LIST_HEAD(&p->list); 458 459 p->qp = ipoib_cm_create_rx_qp(dev, p); 460 if (IS_ERR(p->qp)) { 461 ret = PTR_ERR(p->qp); 462 goto err_qp; 463 } 464 465 psn = prandom_u32() & 0xffffff; 466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 467 if (ret) 468 goto err_modify; 469 470 if (!ipoib_cm_has_srq(dev)) { 471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 472 if (ret) 473 goto err_modify; 474 } 475 476 spin_lock_irq(&priv->lock); 477 queue_delayed_work(priv->wq, 478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 479 /* Add this entry to passive ids list head, but do not re-add it 480 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 481 p->jiffies = jiffies; 482 if (p->state == IPOIB_CM_RX_LIVE) 483 list_move(&p->list, &priv->cm.passive_ids); 484 spin_unlock_irq(&priv->lock); 485 486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 487 if (ret) { 488 ipoib_warn(priv, "failed to send REP: %d\n", ret); 489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 490 ipoib_warn(priv, "unable to move qp to error state\n"); 491 } 492 return 0; 493 494 err_modify: 495 ib_destroy_qp(p->qp); 496 err_qp: 497 kfree(p); 498 return ret; 499 } 500 501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 502 struct ib_cm_event *event) 503 { 504 struct ipoib_cm_rx *p; 505 struct ipoib_dev_priv *priv; 506 507 switch (event->event) { 508 case IB_CM_REQ_RECEIVED: 509 return ipoib_cm_req_handler(cm_id, event); 510 case IB_CM_DREQ_RECEIVED: 511 p = cm_id->context; 512 ib_send_cm_drep(cm_id, NULL, 0); 513 /* Fall through */ 514 case IB_CM_REJ_RECEIVED: 515 p = cm_id->context; 516 priv = netdev_priv(p->dev); 517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 518 ipoib_warn(priv, "unable to move qp to error state\n"); 519 /* Fall through */ 520 default: 521 return 0; 522 } 523 } 524 /* Adjust length of skb with fragments to match received data */ 525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 526 unsigned int length, struct sk_buff *toskb) 527 { 528 int i, num_frags; 529 unsigned int size; 530 531 /* put header into skb */ 532 size = min(length, hdr_space); 533 skb->tail += size; 534 skb->len += size; 535 length -= size; 536 537 num_frags = skb_shinfo(skb)->nr_frags; 538 for (i = 0; i < num_frags; i++) { 539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 540 541 if (length == 0) { 542 /* don't need this page */ 543 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 544 0, PAGE_SIZE); 545 --skb_shinfo(skb)->nr_frags; 546 } else { 547 size = min(length, (unsigned) PAGE_SIZE); 548 549 skb_frag_size_set(frag, size); 550 skb->data_len += size; 551 skb->truesize += size; 552 skb->len += size; 553 length -= size; 554 } 555 } 556 } 557 558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 559 { 560 struct ipoib_dev_priv *priv = netdev_priv(dev); 561 struct ipoib_cm_rx_buf *rx_ring; 562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 563 struct sk_buff *skb, *newskb; 564 struct ipoib_cm_rx *p; 565 unsigned long flags; 566 u64 mapping[IPOIB_CM_RX_SG]; 567 int frags; 568 int has_srq; 569 struct sk_buff *small_skb; 570 571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 572 wr_id, wc->status); 573 574 if (unlikely(wr_id >= ipoib_recvq_size)) { 575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 576 spin_lock_irqsave(&priv->lock, flags); 577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 578 ipoib_cm_start_rx_drain(priv); 579 queue_work(priv->wq, &priv->cm.rx_reap_task); 580 spin_unlock_irqrestore(&priv->lock, flags); 581 } else 582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 583 wr_id, ipoib_recvq_size); 584 return; 585 } 586 587 p = wc->qp->qp_context; 588 589 has_srq = ipoib_cm_has_srq(dev); 590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 591 592 skb = rx_ring[wr_id].skb; 593 594 if (unlikely(wc->status != IB_WC_SUCCESS)) { 595 ipoib_dbg(priv, "cm recv error " 596 "(status=%d, wrid=%d vend_err %x)\n", 597 wc->status, wr_id, wc->vendor_err); 598 ++dev->stats.rx_dropped; 599 if (has_srq) 600 goto repost; 601 else { 602 if (!--p->recv_count) { 603 spin_lock_irqsave(&priv->lock, flags); 604 list_move(&p->list, &priv->cm.rx_reap_list); 605 spin_unlock_irqrestore(&priv->lock, flags); 606 queue_work(priv->wq, &priv->cm.rx_reap_task); 607 } 608 return; 609 } 610 } 611 612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 614 spin_lock_irqsave(&priv->lock, flags); 615 p->jiffies = jiffies; 616 /* Move this entry to list head, but do not re-add it 617 * if it has been moved out of list. */ 618 if (p->state == IPOIB_CM_RX_LIVE) 619 list_move(&p->list, &priv->cm.passive_ids); 620 spin_unlock_irqrestore(&priv->lock, flags); 621 } 622 } 623 624 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 625 int dlen = wc->byte_len; 626 627 small_skb = dev_alloc_skb(dlen + 12); 628 if (small_skb) { 629 skb_reserve(small_skb, 12); 630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 631 dlen, DMA_FROM_DEVICE); 632 skb_copy_from_linear_data(skb, small_skb->data, dlen); 633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 634 dlen, DMA_FROM_DEVICE); 635 skb_put(small_skb, dlen); 636 skb = small_skb; 637 goto copied; 638 } 639 } 640 641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 643 644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, 645 mapping, GFP_ATOMIC); 646 if (unlikely(!newskb)) { 647 /* 648 * If we can't allocate a new RX buffer, dump 649 * this packet and reuse the old buffer. 650 */ 651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 652 ++dev->stats.rx_dropped; 653 goto repost; 654 } 655 656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 658 659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 660 wc->byte_len, wc->slid); 661 662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 663 664 copied: 665 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 666 skb_reset_mac_header(skb); 667 skb_pull(skb, IPOIB_ENCAP_LEN); 668 669 ++dev->stats.rx_packets; 670 dev->stats.rx_bytes += skb->len; 671 672 skb->dev = dev; 673 /* XXX get correct PACKET_ type here */ 674 skb->pkt_type = PACKET_HOST; 675 netif_receive_skb(skb); 676 677 repost: 678 if (has_srq) { 679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 681 "for buf %d\n", wr_id); 682 } else { 683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 684 &priv->cm.rx_wr, 685 priv->cm.rx_sge, 686 wr_id))) { 687 --p->recv_count; 688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 689 "for buf %d\n", wr_id); 690 } 691 } 692 } 693 694 static inline int post_send(struct ipoib_dev_priv *priv, 695 struct ipoib_cm_tx *tx, 696 unsigned int wr_id, 697 u64 addr, int len) 698 { 699 struct ib_send_wr *bad_wr; 700 701 priv->tx_sge[0].addr = addr; 702 priv->tx_sge[0].length = len; 703 704 priv->tx_wr.num_sge = 1; 705 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 706 707 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 708 } 709 710 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 711 { 712 struct ipoib_dev_priv *priv = netdev_priv(dev); 713 struct ipoib_cm_tx_buf *tx_req; 714 u64 addr; 715 int rc; 716 717 if (unlikely(skb->len > tx->mtu)) { 718 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 719 skb->len, tx->mtu); 720 ++dev->stats.tx_dropped; 721 ++dev->stats.tx_errors; 722 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 723 return; 724 } 725 726 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 727 tx->tx_head, skb->len, tx->qp->qp_num); 728 729 /* 730 * We put the skb into the tx_ring _before_ we call post_send() 731 * because it's entirely possible that the completion handler will 732 * run before we execute anything after the post_send(). That 733 * means we have to make sure everything is properly recorded and 734 * our state is consistent before we call post_send(). 735 */ 736 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 737 tx_req->skb = skb; 738 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 739 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 740 ++dev->stats.tx_errors; 741 dev_kfree_skb_any(skb); 742 return; 743 } 744 745 tx_req->mapping = addr; 746 747 skb_orphan(skb); 748 skb_dst_drop(skb); 749 750 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 751 addr, skb->len); 752 if (unlikely(rc)) { 753 ipoib_warn(priv, "post_send failed, error %d\n", rc); 754 ++dev->stats.tx_errors; 755 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 756 dev_kfree_skb_any(skb); 757 } else { 758 dev->trans_start = jiffies; 759 ++tx->tx_head; 760 761 if (++priv->tx_outstanding == ipoib_sendq_size) { 762 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 763 tx->qp->qp_num); 764 netif_stop_queue(dev); 765 rc = ib_req_notify_cq(priv->send_cq, 766 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 767 if (rc < 0) 768 ipoib_warn(priv, "request notify on send CQ failed\n"); 769 else if (rc) 770 ipoib_send_comp_handler(priv->send_cq, dev); 771 } 772 } 773 } 774 775 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 776 { 777 struct ipoib_dev_priv *priv = netdev_priv(dev); 778 struct ipoib_cm_tx *tx = wc->qp->qp_context; 779 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 780 struct ipoib_cm_tx_buf *tx_req; 781 unsigned long flags; 782 783 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 784 wr_id, wc->status); 785 786 if (unlikely(wr_id >= ipoib_sendq_size)) { 787 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 788 wr_id, ipoib_sendq_size); 789 return; 790 } 791 792 tx_req = &tx->tx_ring[wr_id]; 793 794 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 795 796 /* FIXME: is this right? Shouldn't we only increment on success? */ 797 ++dev->stats.tx_packets; 798 dev->stats.tx_bytes += tx_req->skb->len; 799 800 dev_kfree_skb_any(tx_req->skb); 801 802 netif_tx_lock(dev); 803 804 ++tx->tx_tail; 805 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 806 netif_queue_stopped(dev) && 807 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 808 netif_wake_queue(dev); 809 810 if (wc->status != IB_WC_SUCCESS && 811 wc->status != IB_WC_WR_FLUSH_ERR) { 812 struct ipoib_neigh *neigh; 813 814 ipoib_dbg(priv, "failed cm send event " 815 "(status=%d, wrid=%d vend_err %x)\n", 816 wc->status, wr_id, wc->vendor_err); 817 818 spin_lock_irqsave(&priv->lock, flags); 819 neigh = tx->neigh; 820 821 if (neigh) { 822 neigh->cm = NULL; 823 ipoib_neigh_free(neigh); 824 825 tx->neigh = NULL; 826 } 827 828 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 829 list_move(&tx->list, &priv->cm.reap_list); 830 queue_work(priv->wq, &priv->cm.reap_task); 831 } 832 833 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 834 835 spin_unlock_irqrestore(&priv->lock, flags); 836 } 837 838 netif_tx_unlock(dev); 839 } 840 841 int ipoib_cm_dev_open(struct net_device *dev) 842 { 843 struct ipoib_dev_priv *priv = netdev_priv(dev); 844 int ret; 845 846 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 847 return 0; 848 849 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 850 if (IS_ERR(priv->cm.id)) { 851 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 852 ret = PTR_ERR(priv->cm.id); 853 goto err_cm; 854 } 855 856 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 857 0, NULL); 858 if (ret) { 859 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 860 IPOIB_CM_IETF_ID | priv->qp->qp_num); 861 goto err_listen; 862 } 863 864 return 0; 865 866 err_listen: 867 ib_destroy_cm_id(priv->cm.id); 868 err_cm: 869 priv->cm.id = NULL; 870 return ret; 871 } 872 873 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 874 { 875 struct ipoib_dev_priv *priv = netdev_priv(dev); 876 struct ipoib_cm_rx *rx, *n; 877 LIST_HEAD(list); 878 879 spin_lock_irq(&priv->lock); 880 list_splice_init(&priv->cm.rx_reap_list, &list); 881 spin_unlock_irq(&priv->lock); 882 883 list_for_each_entry_safe(rx, n, &list, list) { 884 ib_destroy_cm_id(rx->id); 885 ib_destroy_qp(rx->qp); 886 if (!ipoib_cm_has_srq(dev)) { 887 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 888 spin_lock_irq(&priv->lock); 889 --priv->cm.nonsrq_conn_qp; 890 spin_unlock_irq(&priv->lock); 891 } 892 kfree(rx); 893 } 894 } 895 896 void ipoib_cm_dev_stop(struct net_device *dev) 897 { 898 struct ipoib_dev_priv *priv = netdev_priv(dev); 899 struct ipoib_cm_rx *p; 900 unsigned long begin; 901 int ret; 902 903 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 904 return; 905 906 ib_destroy_cm_id(priv->cm.id); 907 priv->cm.id = NULL; 908 909 spin_lock_irq(&priv->lock); 910 while (!list_empty(&priv->cm.passive_ids)) { 911 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 912 list_move(&p->list, &priv->cm.rx_error_list); 913 p->state = IPOIB_CM_RX_ERROR; 914 spin_unlock_irq(&priv->lock); 915 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 916 if (ret) 917 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 918 spin_lock_irq(&priv->lock); 919 } 920 921 /* Wait for all RX to be drained */ 922 begin = jiffies; 923 924 while (!list_empty(&priv->cm.rx_error_list) || 925 !list_empty(&priv->cm.rx_flush_list) || 926 !list_empty(&priv->cm.rx_drain_list)) { 927 if (time_after(jiffies, begin + 5 * HZ)) { 928 ipoib_warn(priv, "RX drain timing out\n"); 929 930 /* 931 * assume the HW is wedged and just free up everything. 932 */ 933 list_splice_init(&priv->cm.rx_flush_list, 934 &priv->cm.rx_reap_list); 935 list_splice_init(&priv->cm.rx_error_list, 936 &priv->cm.rx_reap_list); 937 list_splice_init(&priv->cm.rx_drain_list, 938 &priv->cm.rx_reap_list); 939 break; 940 } 941 spin_unlock_irq(&priv->lock); 942 msleep(1); 943 ipoib_drain_cq(dev); 944 spin_lock_irq(&priv->lock); 945 } 946 947 spin_unlock_irq(&priv->lock); 948 949 ipoib_cm_free_rx_reap_list(dev); 950 951 cancel_delayed_work(&priv->cm.stale_task); 952 } 953 954 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 955 { 956 struct ipoib_cm_tx *p = cm_id->context; 957 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 958 struct ipoib_cm_data *data = event->private_data; 959 struct sk_buff_head skqueue; 960 struct ib_qp_attr qp_attr; 961 int qp_attr_mask, ret; 962 struct sk_buff *skb; 963 964 p->mtu = be32_to_cpu(data->mtu); 965 966 if (p->mtu <= IPOIB_ENCAP_LEN) { 967 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 968 p->mtu, IPOIB_ENCAP_LEN); 969 return -EINVAL; 970 } 971 972 qp_attr.qp_state = IB_QPS_RTR; 973 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 974 if (ret) { 975 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 976 return ret; 977 } 978 979 qp_attr.rq_psn = 0 /* FIXME */; 980 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 981 if (ret) { 982 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 983 return ret; 984 } 985 986 qp_attr.qp_state = IB_QPS_RTS; 987 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 988 if (ret) { 989 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 990 return ret; 991 } 992 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 993 if (ret) { 994 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 995 return ret; 996 } 997 998 skb_queue_head_init(&skqueue); 999 1000 spin_lock_irq(&priv->lock); 1001 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 1002 if (p->neigh) 1003 while ((skb = __skb_dequeue(&p->neigh->queue))) 1004 __skb_queue_tail(&skqueue, skb); 1005 spin_unlock_irq(&priv->lock); 1006 1007 while ((skb = __skb_dequeue(&skqueue))) { 1008 skb->dev = p->dev; 1009 if (dev_queue_xmit(skb)) 1010 ipoib_warn(priv, "dev_queue_xmit failed " 1011 "to requeue packet\n"); 1012 } 1013 1014 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1015 if (ret) { 1016 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1017 return ret; 1018 } 1019 return 0; 1020 } 1021 1022 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1023 { 1024 struct ipoib_dev_priv *priv = netdev_priv(dev); 1025 struct ib_qp_init_attr attr = { 1026 .send_cq = priv->recv_cq, 1027 .recv_cq = priv->recv_cq, 1028 .srq = priv->cm.srq, 1029 .cap.max_send_wr = ipoib_sendq_size, 1030 .cap.max_send_sge = 1, 1031 .sq_sig_type = IB_SIGNAL_ALL_WR, 1032 .qp_type = IB_QPT_RC, 1033 .qp_context = tx, 1034 .create_flags = IB_QP_CREATE_USE_GFP_NOIO 1035 }; 1036 1037 struct ib_qp *tx_qp; 1038 1039 tx_qp = ib_create_qp(priv->pd, &attr); 1040 if (PTR_ERR(tx_qp) == -EINVAL) { 1041 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n", 1042 priv->ca->name); 1043 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO; 1044 tx_qp = ib_create_qp(priv->pd, &attr); 1045 } 1046 return tx_qp; 1047 } 1048 1049 static int ipoib_cm_send_req(struct net_device *dev, 1050 struct ib_cm_id *id, struct ib_qp *qp, 1051 u32 qpn, 1052 struct ib_sa_path_rec *pathrec) 1053 { 1054 struct ipoib_dev_priv *priv = netdev_priv(dev); 1055 struct ipoib_cm_data data = {}; 1056 struct ib_cm_req_param req = {}; 1057 1058 data.qpn = cpu_to_be32(priv->qp->qp_num); 1059 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1060 1061 req.primary_path = pathrec; 1062 req.alternate_path = NULL; 1063 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1064 req.qp_num = qp->qp_num; 1065 req.qp_type = qp->qp_type; 1066 req.private_data = &data; 1067 req.private_data_len = sizeof data; 1068 req.flow_control = 0; 1069 1070 req.starting_psn = 0; /* FIXME */ 1071 1072 /* 1073 * Pick some arbitrary defaults here; we could make these 1074 * module parameters if anyone cared about setting them. 1075 */ 1076 req.responder_resources = 4; 1077 req.remote_cm_response_timeout = 20; 1078 req.local_cm_response_timeout = 20; 1079 req.retry_count = 0; /* RFC draft warns against retries */ 1080 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1081 req.max_cm_retries = 15; 1082 req.srq = ipoib_cm_has_srq(dev); 1083 return ib_send_cm_req(id, &req); 1084 } 1085 1086 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1087 struct ib_cm_id *cm_id, struct ib_qp *qp) 1088 { 1089 struct ipoib_dev_priv *priv = netdev_priv(dev); 1090 struct ib_qp_attr qp_attr; 1091 int qp_attr_mask, ret; 1092 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1093 if (ret) { 1094 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1095 return ret; 1096 } 1097 1098 qp_attr.qp_state = IB_QPS_INIT; 1099 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1100 qp_attr.port_num = priv->port; 1101 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1102 1103 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1104 if (ret) { 1105 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1106 return ret; 1107 } 1108 return 0; 1109 } 1110 1111 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1112 struct ib_sa_path_rec *pathrec) 1113 { 1114 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1115 int ret; 1116 1117 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring, 1118 GFP_NOIO, PAGE_KERNEL); 1119 if (!p->tx_ring) { 1120 ipoib_warn(priv, "failed to allocate tx ring\n"); 1121 ret = -ENOMEM; 1122 goto err_tx; 1123 } 1124 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1125 1126 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1127 if (IS_ERR(p->qp)) { 1128 ret = PTR_ERR(p->qp); 1129 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1130 goto err_qp; 1131 } 1132 1133 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1134 if (IS_ERR(p->id)) { 1135 ret = PTR_ERR(p->id); 1136 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1137 goto err_id; 1138 } 1139 1140 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1141 if (ret) { 1142 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1143 goto err_modify; 1144 } 1145 1146 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1147 if (ret) { 1148 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1149 goto err_send_cm; 1150 } 1151 1152 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1153 p->qp->qp_num, pathrec->dgid.raw, qpn); 1154 1155 return 0; 1156 1157 err_send_cm: 1158 err_modify: 1159 ib_destroy_cm_id(p->id); 1160 err_id: 1161 p->id = NULL; 1162 ib_destroy_qp(p->qp); 1163 err_qp: 1164 p->qp = NULL; 1165 vfree(p->tx_ring); 1166 err_tx: 1167 return ret; 1168 } 1169 1170 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1171 { 1172 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1173 struct ipoib_cm_tx_buf *tx_req; 1174 unsigned long begin; 1175 1176 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1177 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1178 1179 if (p->id) 1180 ib_destroy_cm_id(p->id); 1181 1182 if (p->tx_ring) { 1183 /* Wait for all sends to complete */ 1184 begin = jiffies; 1185 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1186 if (time_after(jiffies, begin + 5 * HZ)) { 1187 ipoib_warn(priv, "timing out; %d sends not completed\n", 1188 p->tx_head - p->tx_tail); 1189 goto timeout; 1190 } 1191 1192 msleep(1); 1193 } 1194 } 1195 1196 timeout: 1197 1198 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1199 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1200 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1201 DMA_TO_DEVICE); 1202 dev_kfree_skb_any(tx_req->skb); 1203 ++p->tx_tail; 1204 netif_tx_lock_bh(p->dev); 1205 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1206 netif_queue_stopped(p->dev) && 1207 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1208 netif_wake_queue(p->dev); 1209 netif_tx_unlock_bh(p->dev); 1210 } 1211 1212 if (p->qp) 1213 ib_destroy_qp(p->qp); 1214 1215 vfree(p->tx_ring); 1216 kfree(p); 1217 } 1218 1219 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1220 struct ib_cm_event *event) 1221 { 1222 struct ipoib_cm_tx *tx = cm_id->context; 1223 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1224 struct net_device *dev = priv->dev; 1225 struct ipoib_neigh *neigh; 1226 unsigned long flags; 1227 int ret; 1228 1229 switch (event->event) { 1230 case IB_CM_DREQ_RECEIVED: 1231 ipoib_dbg(priv, "DREQ received.\n"); 1232 ib_send_cm_drep(cm_id, NULL, 0); 1233 break; 1234 case IB_CM_REP_RECEIVED: 1235 ipoib_dbg(priv, "REP received.\n"); 1236 ret = ipoib_cm_rep_handler(cm_id, event); 1237 if (ret) 1238 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1239 NULL, 0, NULL, 0); 1240 break; 1241 case IB_CM_REQ_ERROR: 1242 case IB_CM_REJ_RECEIVED: 1243 case IB_CM_TIMEWAIT_EXIT: 1244 ipoib_dbg(priv, "CM error %d.\n", event->event); 1245 netif_tx_lock_bh(dev); 1246 spin_lock_irqsave(&priv->lock, flags); 1247 neigh = tx->neigh; 1248 1249 if (neigh) { 1250 neigh->cm = NULL; 1251 ipoib_neigh_free(neigh); 1252 1253 tx->neigh = NULL; 1254 } 1255 1256 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1257 list_move(&tx->list, &priv->cm.reap_list); 1258 queue_work(priv->wq, &priv->cm.reap_task); 1259 } 1260 1261 spin_unlock_irqrestore(&priv->lock, flags); 1262 netif_tx_unlock_bh(dev); 1263 break; 1264 default: 1265 break; 1266 } 1267 1268 return 0; 1269 } 1270 1271 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1272 struct ipoib_neigh *neigh) 1273 { 1274 struct ipoib_dev_priv *priv = netdev_priv(dev); 1275 struct ipoib_cm_tx *tx; 1276 1277 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1278 if (!tx) 1279 return NULL; 1280 1281 neigh->cm = tx; 1282 tx->neigh = neigh; 1283 tx->path = path; 1284 tx->dev = dev; 1285 list_add(&tx->list, &priv->cm.start_list); 1286 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1287 queue_work(priv->wq, &priv->cm.start_task); 1288 return tx; 1289 } 1290 1291 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1292 { 1293 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1294 unsigned long flags; 1295 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1296 spin_lock_irqsave(&priv->lock, flags); 1297 list_move(&tx->list, &priv->cm.reap_list); 1298 queue_work(priv->wq, &priv->cm.reap_task); 1299 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1300 tx->neigh->daddr + 4); 1301 tx->neigh = NULL; 1302 spin_unlock_irqrestore(&priv->lock, flags); 1303 } 1304 } 1305 1306 static void ipoib_cm_tx_start(struct work_struct *work) 1307 { 1308 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1309 cm.start_task); 1310 struct net_device *dev = priv->dev; 1311 struct ipoib_neigh *neigh; 1312 struct ipoib_cm_tx *p; 1313 unsigned long flags; 1314 int ret; 1315 1316 struct ib_sa_path_rec pathrec; 1317 u32 qpn; 1318 1319 netif_tx_lock_bh(dev); 1320 spin_lock_irqsave(&priv->lock, flags); 1321 1322 while (!list_empty(&priv->cm.start_list)) { 1323 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1324 list_del_init(&p->list); 1325 neigh = p->neigh; 1326 qpn = IPOIB_QPN(neigh->daddr); 1327 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1328 1329 spin_unlock_irqrestore(&priv->lock, flags); 1330 netif_tx_unlock_bh(dev); 1331 1332 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1333 1334 netif_tx_lock_bh(dev); 1335 spin_lock_irqsave(&priv->lock, flags); 1336 1337 if (ret) { 1338 neigh = p->neigh; 1339 if (neigh) { 1340 neigh->cm = NULL; 1341 ipoib_neigh_free(neigh); 1342 } 1343 list_del(&p->list); 1344 kfree(p); 1345 } 1346 } 1347 1348 spin_unlock_irqrestore(&priv->lock, flags); 1349 netif_tx_unlock_bh(dev); 1350 } 1351 1352 static void ipoib_cm_tx_reap(struct work_struct *work) 1353 { 1354 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1355 cm.reap_task); 1356 struct net_device *dev = priv->dev; 1357 struct ipoib_cm_tx *p; 1358 unsigned long flags; 1359 1360 netif_tx_lock_bh(dev); 1361 spin_lock_irqsave(&priv->lock, flags); 1362 1363 while (!list_empty(&priv->cm.reap_list)) { 1364 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1365 list_del(&p->list); 1366 spin_unlock_irqrestore(&priv->lock, flags); 1367 netif_tx_unlock_bh(dev); 1368 ipoib_cm_tx_destroy(p); 1369 netif_tx_lock_bh(dev); 1370 spin_lock_irqsave(&priv->lock, flags); 1371 } 1372 1373 spin_unlock_irqrestore(&priv->lock, flags); 1374 netif_tx_unlock_bh(dev); 1375 } 1376 1377 static void ipoib_cm_skb_reap(struct work_struct *work) 1378 { 1379 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1380 cm.skb_task); 1381 struct net_device *dev = priv->dev; 1382 struct sk_buff *skb; 1383 unsigned long flags; 1384 unsigned mtu = priv->mcast_mtu; 1385 1386 netif_tx_lock_bh(dev); 1387 spin_lock_irqsave(&priv->lock, flags); 1388 1389 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1390 spin_unlock_irqrestore(&priv->lock, flags); 1391 netif_tx_unlock_bh(dev); 1392 1393 if (skb->protocol == htons(ETH_P_IP)) 1394 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1395 #if IS_ENABLED(CONFIG_IPV6) 1396 else if (skb->protocol == htons(ETH_P_IPV6)) 1397 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1398 #endif 1399 dev_kfree_skb_any(skb); 1400 1401 netif_tx_lock_bh(dev); 1402 spin_lock_irqsave(&priv->lock, flags); 1403 } 1404 1405 spin_unlock_irqrestore(&priv->lock, flags); 1406 netif_tx_unlock_bh(dev); 1407 } 1408 1409 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1410 unsigned int mtu) 1411 { 1412 struct ipoib_dev_priv *priv = netdev_priv(dev); 1413 int e = skb_queue_empty(&priv->cm.skb_queue); 1414 1415 if (skb_dst(skb)) 1416 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1417 1418 skb_queue_tail(&priv->cm.skb_queue, skb); 1419 if (e) 1420 queue_work(priv->wq, &priv->cm.skb_task); 1421 } 1422 1423 static void ipoib_cm_rx_reap(struct work_struct *work) 1424 { 1425 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1426 cm.rx_reap_task)->dev); 1427 } 1428 1429 static void ipoib_cm_stale_task(struct work_struct *work) 1430 { 1431 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1432 cm.stale_task.work); 1433 struct ipoib_cm_rx *p; 1434 int ret; 1435 1436 spin_lock_irq(&priv->lock); 1437 while (!list_empty(&priv->cm.passive_ids)) { 1438 /* List is sorted by LRU, start from tail, 1439 * stop when we see a recently used entry */ 1440 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1441 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1442 break; 1443 list_move(&p->list, &priv->cm.rx_error_list); 1444 p->state = IPOIB_CM_RX_ERROR; 1445 spin_unlock_irq(&priv->lock); 1446 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1447 if (ret) 1448 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1449 spin_lock_irq(&priv->lock); 1450 } 1451 1452 if (!list_empty(&priv->cm.passive_ids)) 1453 queue_delayed_work(priv->wq, 1454 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1455 spin_unlock_irq(&priv->lock); 1456 } 1457 1458 1459 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1460 char *buf) 1461 { 1462 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1463 1464 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1465 return sprintf(buf, "connected\n"); 1466 else 1467 return sprintf(buf, "datagram\n"); 1468 } 1469 1470 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1471 const char *buf, size_t count) 1472 { 1473 struct net_device *dev = to_net_dev(d); 1474 int ret; 1475 1476 if (!rtnl_trylock()) 1477 return restart_syscall(); 1478 1479 ret = ipoib_set_mode(dev, buf); 1480 1481 rtnl_unlock(); 1482 1483 if (!ret) 1484 return count; 1485 1486 return ret; 1487 } 1488 1489 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1490 1491 int ipoib_cm_add_mode_attr(struct net_device *dev) 1492 { 1493 return device_create_file(&dev->dev, &dev_attr_mode); 1494 } 1495 1496 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1497 { 1498 struct ipoib_dev_priv *priv = netdev_priv(dev); 1499 struct ib_srq_init_attr srq_init_attr = { 1500 .srq_type = IB_SRQT_BASIC, 1501 .attr = { 1502 .max_wr = ipoib_recvq_size, 1503 .max_sge = max_sge 1504 } 1505 }; 1506 1507 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1508 if (IS_ERR(priv->cm.srq)) { 1509 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1510 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1511 priv->ca->name, PTR_ERR(priv->cm.srq)); 1512 priv->cm.srq = NULL; 1513 return; 1514 } 1515 1516 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1517 if (!priv->cm.srq_ring) { 1518 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1519 priv->ca->name, ipoib_recvq_size); 1520 ib_destroy_srq(priv->cm.srq); 1521 priv->cm.srq = NULL; 1522 return; 1523 } 1524 1525 } 1526 1527 int ipoib_cm_dev_init(struct net_device *dev) 1528 { 1529 struct ipoib_dev_priv *priv = netdev_priv(dev); 1530 int i, ret; 1531 struct ib_device_attr attr; 1532 1533 INIT_LIST_HEAD(&priv->cm.passive_ids); 1534 INIT_LIST_HEAD(&priv->cm.reap_list); 1535 INIT_LIST_HEAD(&priv->cm.start_list); 1536 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1537 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1538 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1539 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1540 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1541 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1542 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1543 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1544 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1545 1546 skb_queue_head_init(&priv->cm.skb_queue); 1547 1548 ret = ib_query_device(priv->ca, &attr); 1549 if (ret) { 1550 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1551 return ret; 1552 } 1553 1554 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1555 1556 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1557 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1558 if (ipoib_cm_has_srq(dev)) { 1559 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1560 priv->cm.num_frags = attr.max_srq_sge; 1561 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1562 priv->cm.max_cm_mtu, priv->cm.num_frags); 1563 } else { 1564 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1565 priv->cm.num_frags = IPOIB_CM_RX_SG; 1566 } 1567 1568 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1569 1570 if (ipoib_cm_has_srq(dev)) { 1571 for (i = 0; i < ipoib_recvq_size; ++i) { 1572 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1573 priv->cm.num_frags - 1, 1574 priv->cm.srq_ring[i].mapping, 1575 GFP_KERNEL)) { 1576 ipoib_warn(priv, "failed to allocate " 1577 "receive buffer %d\n", i); 1578 ipoib_cm_dev_cleanup(dev); 1579 return -ENOMEM; 1580 } 1581 1582 if (ipoib_cm_post_receive_srq(dev, i)) { 1583 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1584 "failed for buf %d\n", i); 1585 ipoib_cm_dev_cleanup(dev); 1586 return -EIO; 1587 } 1588 } 1589 } 1590 1591 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1592 return 0; 1593 } 1594 1595 void ipoib_cm_dev_cleanup(struct net_device *dev) 1596 { 1597 struct ipoib_dev_priv *priv = netdev_priv(dev); 1598 int ret; 1599 1600 if (!priv->cm.srq) 1601 return; 1602 1603 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1604 1605 ret = ib_destroy_srq(priv->cm.srq); 1606 if (ret) 1607 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1608 1609 priv->cm.srq = NULL; 1610 if (!priv->cm.srq_ring) 1611 return; 1612 1613 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1614 priv->cm.srq_ring = NULL; 1615 } 1616