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 46 int ipoib_max_conn_qp = 128; 47 48 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 49 MODULE_PARM_DESC(max_nonsrq_conn_qp, 50 "Max number of connected-mode QPs per interface " 51 "(applied only if shared receive queue is not available)"); 52 53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 54 static int data_debug_level; 55 56 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 57 MODULE_PARM_DESC(cm_data_debug_level, 58 "Enable data path debug tracing for connected mode if > 0"); 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 70 static 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 76 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 77 .opcode = IB_WR_SEND, 78 }; 79 80 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 81 const struct ib_cm_event *event); 82 83 static 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 94 static 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 } 115 116 static 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 } 140 141 static 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; 183 184 partial_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 } 194 195 static 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 } 210 211 static 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 } 232 233 static 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 } 248 249 static 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 } 272 273 static 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 } 327 328 static 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 } 346 347 static 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; 405 406 err_count: 407 spin_lock_irq(&priv->lock); 408 --priv->cm.nonsrq_conn_qp; 409 spin_unlock_irq(&priv->lock); 410 411 err_free: 412 kfree(t); 413 414 err_free_1: 415 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 416 417 return ret; 418 } 419 420 static 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 } 441 442 static 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; 496 497 err_modify: 498 ib_destroy_qp(p->qp); 499 err_qp: 500 kfree(p); 501 return ret; 502 } 503 504 static 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 */ 527 static 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 } 559 560 void 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); 666 667 copied: 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); 678 679 repost: 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 } 695 696 static 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 } 707 708 void 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 } 793 794 void 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 } 871 872 int 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; 896 897 err_listen: 898 ib_destroy_cm_id(priv->cm.id); 899 err_cm: 900 priv->cm.id = NULL; 901 return ret; 902 } 903 904 static 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 } 926 927 void 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 } 984 985 static 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 1057 static 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 1082 static 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 1119 static 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 1140 static 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 1187 err_modify_send: 1188 ib_destroy_cm_id(p->id); 1189 err_id: 1190 p->id = NULL; 1191 ib_destroy_qp(p->qp); 1192 err_qp: 1193 p->qp = NULL; 1194 vfree(p->tx_ring); 1195 err_tx: 1196 return ret; 1197 } 1198 1199 static 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 1225 timeout: 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 1249 static 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 1301 struct 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 1320 void 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 1337 static 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) { 1382 free_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 1397 static 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 1422 static 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 1458 void 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 1471 static 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 1477 static 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 1506 static 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 1518 static 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 1545 static DEVICE_ATTR_RW(mode); 1546 1547 int ipoib_cm_add_mode_attr(struct net_device *dev) 1548 { 1549 return device_create_file(&dev->dev, &dev_attr_mode); 1550 } 1551 1552 static 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 1582 int 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 1645 void 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 } 1662