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 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 struct ib_recv_wr *bad_wr; 98 int i, ret; 99 100 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 101 102 for (i = 0; i < priv->cm.num_frags; ++i) 103 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 104 105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 106 if (unlikely(ret)) { 107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 108 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 109 priv->cm.srq_ring[id].mapping); 110 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 111 priv->cm.srq_ring[id].skb = NULL; 112 } 113 114 return ret; 115 } 116 117 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 118 struct ipoib_cm_rx *rx, 119 struct ib_recv_wr *wr, 120 struct ib_sge *sge, int id) 121 { 122 struct ipoib_dev_priv *priv = ipoib_priv(dev); 123 struct ib_recv_wr *bad_wr; 124 int i, ret; 125 126 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 127 128 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 129 sge[i].addr = rx->rx_ring[id].mapping[i]; 130 131 ret = ib_post_recv(rx->qp, wr, &bad_wr); 132 if (unlikely(ret)) { 133 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 134 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 135 rx->rx_ring[id].mapping); 136 dev_kfree_skb_any(rx->rx_ring[id].skb); 137 rx->rx_ring[id].skb = NULL; 138 } 139 140 return ret; 141 } 142 143 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 144 struct ipoib_cm_rx_buf *rx_ring, 145 int id, int frags, 146 u64 mapping[IPOIB_CM_RX_SG], 147 gfp_t gfp) 148 { 149 struct ipoib_dev_priv *priv = ipoib_priv(dev); 150 struct sk_buff *skb; 151 int i; 152 153 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16)); 154 if (unlikely(!skb)) 155 return NULL; 156 157 /* 158 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the 159 * IP header to a multiple of 16. 160 */ 161 skb_reserve(skb, IPOIB_CM_RX_RESERVE); 162 163 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 164 DMA_FROM_DEVICE); 165 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 166 dev_kfree_skb_any(skb); 167 return NULL; 168 } 169 170 for (i = 0; i < frags; i++) { 171 struct page *page = alloc_page(gfp); 172 173 if (!page) 174 goto partial_error; 175 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 176 177 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 178 0, PAGE_SIZE, DMA_FROM_DEVICE); 179 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 180 goto partial_error; 181 } 182 183 rx_ring[id].skb = skb; 184 return skb; 185 186 partial_error: 187 188 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 189 190 for (; i > 0; --i) 191 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 192 193 dev_kfree_skb_any(skb); 194 return NULL; 195 } 196 197 static void ipoib_cm_free_rx_ring(struct net_device *dev, 198 struct ipoib_cm_rx_buf *rx_ring) 199 { 200 struct ipoib_dev_priv *priv = ipoib_priv(dev); 201 int i; 202 203 for (i = 0; i < ipoib_recvq_size; ++i) 204 if (rx_ring[i].skb) { 205 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 206 rx_ring[i].mapping); 207 dev_kfree_skb_any(rx_ring[i].skb); 208 } 209 210 vfree(rx_ring); 211 } 212 213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 214 { 215 struct ib_send_wr *bad_wr; 216 struct ipoib_cm_rx *p; 217 218 /* We only reserved 1 extra slot in CQ for drain WRs, so 219 * make sure we have at most 1 outstanding WR. */ 220 if (list_empty(&priv->cm.rx_flush_list) || 221 !list_empty(&priv->cm.rx_drain_list)) 222 return; 223 224 /* 225 * QPs on flush list are error state. This way, a "flush 226 * error" WC will be immediately generated for each WR we post. 227 */ 228 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 229 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID; 230 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 231 ipoib_warn(priv, "failed to post drain wr\n"); 232 233 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 234 } 235 236 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 237 { 238 struct ipoib_cm_rx *p = ctx; 239 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 240 unsigned long flags; 241 242 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 243 return; 244 245 spin_lock_irqsave(&priv->lock, flags); 246 list_move(&p->list, &priv->cm.rx_flush_list); 247 p->state = IPOIB_CM_RX_FLUSH; 248 ipoib_cm_start_rx_drain(priv); 249 spin_unlock_irqrestore(&priv->lock, flags); 250 } 251 252 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 253 struct ipoib_cm_rx *p) 254 { 255 struct ipoib_dev_priv *priv = ipoib_priv(dev); 256 struct ib_qp_init_attr attr = { 257 .event_handler = ipoib_cm_rx_event_handler, 258 .send_cq = priv->recv_cq, /* For drain WR */ 259 .recv_cq = priv->recv_cq, 260 .srq = priv->cm.srq, 261 .cap.max_send_wr = 1, /* For drain WR */ 262 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 263 .sq_sig_type = IB_SIGNAL_ALL_WR, 264 .qp_type = IB_QPT_RC, 265 .qp_context = p, 266 }; 267 268 if (!ipoib_cm_has_srq(dev)) { 269 attr.cap.max_recv_wr = ipoib_recvq_size; 270 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 271 } 272 273 return ib_create_qp(priv->pd, &attr); 274 } 275 276 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 277 struct ib_cm_id *cm_id, struct ib_qp *qp, 278 unsigned psn) 279 { 280 struct ipoib_dev_priv *priv = ipoib_priv(dev); 281 struct ib_qp_attr qp_attr; 282 int qp_attr_mask, ret; 283 284 qp_attr.qp_state = IB_QPS_INIT; 285 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 286 if (ret) { 287 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 288 return ret; 289 } 290 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 291 if (ret) { 292 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 293 return ret; 294 } 295 qp_attr.qp_state = IB_QPS_RTR; 296 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 297 if (ret) { 298 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 299 return ret; 300 } 301 qp_attr.rq_psn = psn; 302 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 303 if (ret) { 304 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 305 return ret; 306 } 307 308 /* 309 * Current Mellanox HCA firmware won't generate completions 310 * with error for drain WRs unless the QP has been moved to 311 * RTS first. This work-around leaves a window where a QP has 312 * moved to error asynchronously, but this will eventually get 313 * fixed in firmware, so let's not error out if modify QP 314 * fails. 315 */ 316 qp_attr.qp_state = IB_QPS_RTS; 317 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 318 if (ret) { 319 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 320 return 0; 321 } 322 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 323 if (ret) { 324 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 325 return 0; 326 } 327 328 return 0; 329 } 330 331 static void ipoib_cm_init_rx_wr(struct net_device *dev, 332 struct ib_recv_wr *wr, 333 struct ib_sge *sge) 334 { 335 struct ipoib_dev_priv *priv = ipoib_priv(dev); 336 int i; 337 338 for (i = 0; i < priv->cm.num_frags; ++i) 339 sge[i].lkey = priv->pd->local_dma_lkey; 340 341 sge[0].length = IPOIB_CM_HEAD_SIZE; 342 for (i = 1; i < priv->cm.num_frags; ++i) 343 sge[i].length = PAGE_SIZE; 344 345 wr->next = NULL; 346 wr->sg_list = sge; 347 wr->num_sge = priv->cm.num_frags; 348 } 349 350 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 351 struct ipoib_cm_rx *rx) 352 { 353 struct ipoib_dev_priv *priv = ipoib_priv(dev); 354 struct { 355 struct ib_recv_wr wr; 356 struct ib_sge sge[IPOIB_CM_RX_SG]; 357 } *t; 358 int ret; 359 int i; 360 361 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 362 if (!rx->rx_ring) 363 return -ENOMEM; 364 365 t = kmalloc(sizeof *t, GFP_KERNEL); 366 if (!t) { 367 ret = -ENOMEM; 368 goto err_free_1; 369 } 370 371 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 372 373 spin_lock_irq(&priv->lock); 374 375 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 376 spin_unlock_irq(&priv->lock); 377 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 378 ret = -EINVAL; 379 goto err_free; 380 } else 381 ++priv->cm.nonsrq_conn_qp; 382 383 spin_unlock_irq(&priv->lock); 384 385 for (i = 0; i < ipoib_recvq_size; ++i) { 386 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 387 rx->rx_ring[i].mapping, 388 GFP_KERNEL)) { 389 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 390 ret = -ENOMEM; 391 goto err_count; 392 } 393 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 394 if (ret) { 395 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 396 "failed for buf %d\n", i); 397 ret = -EIO; 398 goto err_count; 399 } 400 } 401 402 rx->recv_count = ipoib_recvq_size; 403 404 kfree(t); 405 406 return 0; 407 408 err_count: 409 spin_lock_irq(&priv->lock); 410 --priv->cm.nonsrq_conn_qp; 411 spin_unlock_irq(&priv->lock); 412 413 err_free: 414 kfree(t); 415 416 err_free_1: 417 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 418 419 return ret; 420 } 421 422 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 423 struct ib_qp *qp, struct ib_cm_req_event_param *req, 424 unsigned psn) 425 { 426 struct ipoib_dev_priv *priv = ipoib_priv(dev); 427 struct ipoib_cm_data data = {}; 428 struct ib_cm_rep_param rep = {}; 429 430 data.qpn = cpu_to_be32(priv->qp->qp_num); 431 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 432 433 rep.private_data = &data; 434 rep.private_data_len = sizeof data; 435 rep.flow_control = 0; 436 rep.rnr_retry_count = req->rnr_retry_count; 437 rep.srq = ipoib_cm_has_srq(dev); 438 rep.qp_num = qp->qp_num; 439 rep.starting_psn = psn; 440 return ib_send_cm_rep(cm_id, &rep); 441 } 442 443 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, 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 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 = prandom_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 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 p = cm_id->context; 515 ib_send_cm_drep(cm_id, NULL, 0); 516 /* Fall through */ 517 case IB_CM_REJ_RECEIVED: 518 p = cm_id->context; 519 priv = ipoib_priv(p->dev); 520 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 521 ipoib_warn(priv, "unable to move qp to error state\n"); 522 /* Fall through */ 523 default: 524 return 0; 525 } 526 } 527 /* Adjust length of skb with fragments to match received data */ 528 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 529 unsigned int length, struct sk_buff *toskb) 530 { 531 int i, num_frags; 532 unsigned int size; 533 534 /* put header into skb */ 535 size = min(length, hdr_space); 536 skb->tail += size; 537 skb->len += size; 538 length -= size; 539 540 num_frags = skb_shinfo(skb)->nr_frags; 541 for (i = 0; i < num_frags; i++) { 542 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 543 544 if (length == 0) { 545 /* don't need this page */ 546 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 547 0, PAGE_SIZE); 548 --skb_shinfo(skb)->nr_frags; 549 } else { 550 size = min(length, (unsigned) PAGE_SIZE); 551 552 skb_frag_size_set(frag, size); 553 skb->data_len += size; 554 skb->truesize += size; 555 skb->len += size; 556 length -= size; 557 } 558 } 559 } 560 561 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 562 { 563 struct ipoib_dev_priv *priv = ipoib_priv(dev); 564 struct ipoib_cm_rx_buf *rx_ring; 565 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 566 struct sk_buff *skb, *newskb; 567 struct ipoib_cm_rx *p; 568 unsigned long flags; 569 u64 mapping[IPOIB_CM_RX_SG]; 570 int frags; 571 int has_srq; 572 struct sk_buff *small_skb; 573 574 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 575 wr_id, wc->status); 576 577 if (unlikely(wr_id >= ipoib_recvq_size)) { 578 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 579 spin_lock_irqsave(&priv->lock, flags); 580 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 581 ipoib_cm_start_rx_drain(priv); 582 queue_work(priv->wq, &priv->cm.rx_reap_task); 583 spin_unlock_irqrestore(&priv->lock, flags); 584 } else 585 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 586 wr_id, ipoib_recvq_size); 587 return; 588 } 589 590 p = wc->qp->qp_context; 591 592 has_srq = ipoib_cm_has_srq(dev); 593 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 594 595 skb = rx_ring[wr_id].skb; 596 597 if (unlikely(wc->status != IB_WC_SUCCESS)) { 598 ipoib_dbg(priv, "cm recv error " 599 "(status=%d, wrid=%d vend_err %x)\n", 600 wc->status, wr_id, wc->vendor_err); 601 ++dev->stats.rx_dropped; 602 if (has_srq) 603 goto repost; 604 else { 605 if (!--p->recv_count) { 606 spin_lock_irqsave(&priv->lock, flags); 607 list_move(&p->list, &priv->cm.rx_reap_list); 608 spin_unlock_irqrestore(&priv->lock, flags); 609 queue_work(priv->wq, &priv->cm.rx_reap_task); 610 } 611 return; 612 } 613 } 614 615 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 616 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 617 spin_lock_irqsave(&priv->lock, flags); 618 p->jiffies = jiffies; 619 /* Move this entry to list head, but do not re-add it 620 * if it has been moved out of list. */ 621 if (p->state == IPOIB_CM_RX_LIVE) 622 list_move(&p->list, &priv->cm.passive_ids); 623 spin_unlock_irqrestore(&priv->lock, flags); 624 } 625 } 626 627 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 628 int dlen = wc->byte_len; 629 630 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE); 631 if (small_skb) { 632 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE); 633 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 634 dlen, DMA_FROM_DEVICE); 635 skb_copy_from_linear_data(skb, small_skb->data, dlen); 636 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 637 dlen, DMA_FROM_DEVICE); 638 skb_put(small_skb, dlen); 639 skb = small_skb; 640 goto copied; 641 } 642 } 643 644 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 645 (unsigned)IPOIB_CM_HEAD_SIZE)) / 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 struct ib_send_wr *bad_wr; 702 703 ipoib_build_sge(priv, tx_req); 704 705 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 706 707 return ib_post_send(tx->qp, &priv->tx_wr.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 = ipoib_priv(dev); 713 struct ipoib_tx_buf *tx_req; 714 int rc; 715 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb); 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 if (skb_shinfo(skb)->nr_frags > usable_sge) { 726 if (skb_linearize(skb) < 0) { 727 ipoib_warn(priv, "skb could not be linearized\n"); 728 ++dev->stats.tx_dropped; 729 ++dev->stats.tx_errors; 730 dev_kfree_skb_any(skb); 731 return; 732 } 733 /* Does skb_linearize return ok without reducing nr_frags? */ 734 if (skb_shinfo(skb)->nr_frags > usable_sge) { 735 ipoib_warn(priv, "too many frags after skb linearize\n"); 736 ++dev->stats.tx_dropped; 737 ++dev->stats.tx_errors; 738 dev_kfree_skb_any(skb); 739 return; 740 } 741 } 742 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 743 tx->tx_head, skb->len, tx->qp->qp_num); 744 745 /* 746 * We put the skb into the tx_ring _before_ we call post_send() 747 * because it's entirely possible that the completion handler will 748 * run before we execute anything after the post_send(). That 749 * means we have to make sure everything is properly recorded and 750 * our state is consistent before we call post_send(). 751 */ 752 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 753 tx_req->skb = skb; 754 755 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 756 ++dev->stats.tx_errors; 757 dev_kfree_skb_any(skb); 758 return; 759 } 760 761 skb_orphan(skb); 762 skb_dst_drop(skb); 763 764 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req); 765 if (unlikely(rc)) { 766 ipoib_warn(priv, "post_send failed, error %d\n", rc); 767 ++dev->stats.tx_errors; 768 ipoib_dma_unmap_tx(priv, tx_req); 769 dev_kfree_skb_any(skb); 770 } else { 771 netif_trans_update(dev); 772 ++tx->tx_head; 773 774 if (++priv->tx_outstanding == ipoib_sendq_size) { 775 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 776 tx->qp->qp_num); 777 netif_stop_queue(dev); 778 rc = ib_req_notify_cq(priv->send_cq, 779 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 780 if (rc < 0) 781 ipoib_warn(priv, "request notify on send CQ failed\n"); 782 else if (rc) 783 ipoib_send_comp_handler(priv->send_cq, dev); 784 } 785 } 786 } 787 788 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 789 { 790 struct ipoib_dev_priv *priv = ipoib_priv(dev); 791 struct ipoib_cm_tx *tx = wc->qp->qp_context; 792 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 793 struct ipoib_tx_buf *tx_req; 794 unsigned long flags; 795 796 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 797 wr_id, wc->status); 798 799 if (unlikely(wr_id >= ipoib_sendq_size)) { 800 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 801 wr_id, ipoib_sendq_size); 802 return; 803 } 804 805 tx_req = &tx->tx_ring[wr_id]; 806 807 ipoib_dma_unmap_tx(priv, tx_req); 808 809 /* FIXME: is this right? Shouldn't we only increment on success? */ 810 ++dev->stats.tx_packets; 811 dev->stats.tx_bytes += tx_req->skb->len; 812 813 dev_kfree_skb_any(tx_req->skb); 814 815 netif_tx_lock(dev); 816 817 ++tx->tx_tail; 818 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 819 netif_queue_stopped(dev) && 820 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 821 netif_wake_queue(dev); 822 823 if (wc->status != IB_WC_SUCCESS && 824 wc->status != IB_WC_WR_FLUSH_ERR) { 825 struct ipoib_neigh *neigh; 826 827 if (wc->status != IB_WC_RNR_RETRY_EXC_ERR) 828 ipoib_warn(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n", 829 wc->status, wr_id, wc->vendor_err); 830 else 831 ipoib_dbg(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n", 832 wc->status, wr_id, wc->vendor_err); 833 834 spin_lock_irqsave(&priv->lock, flags); 835 neigh = tx->neigh; 836 837 if (neigh) { 838 neigh->cm = NULL; 839 ipoib_neigh_free(neigh); 840 841 tx->neigh = NULL; 842 } 843 844 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 845 list_move(&tx->list, &priv->cm.reap_list); 846 queue_work(priv->wq, &priv->cm.reap_task); 847 } 848 849 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 850 851 spin_unlock_irqrestore(&priv->lock, flags); 852 } 853 854 netif_tx_unlock(dev); 855 } 856 857 int ipoib_cm_dev_open(struct net_device *dev) 858 { 859 struct ipoib_dev_priv *priv = ipoib_priv(dev); 860 int ret; 861 862 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 863 return 0; 864 865 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 866 if (IS_ERR(priv->cm.id)) { 867 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 868 ret = PTR_ERR(priv->cm.id); 869 goto err_cm; 870 } 871 872 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 873 0); 874 if (ret) { 875 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 876 IPOIB_CM_IETF_ID | priv->qp->qp_num); 877 goto err_listen; 878 } 879 880 return 0; 881 882 err_listen: 883 ib_destroy_cm_id(priv->cm.id); 884 err_cm: 885 priv->cm.id = NULL; 886 return ret; 887 } 888 889 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 890 { 891 struct ipoib_dev_priv *priv = ipoib_priv(dev); 892 struct ipoib_cm_rx *rx, *n; 893 LIST_HEAD(list); 894 895 spin_lock_irq(&priv->lock); 896 list_splice_init(&priv->cm.rx_reap_list, &list); 897 spin_unlock_irq(&priv->lock); 898 899 list_for_each_entry_safe(rx, n, &list, list) { 900 ib_destroy_cm_id(rx->id); 901 ib_destroy_qp(rx->qp); 902 if (!ipoib_cm_has_srq(dev)) { 903 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 904 spin_lock_irq(&priv->lock); 905 --priv->cm.nonsrq_conn_qp; 906 spin_unlock_irq(&priv->lock); 907 } 908 kfree(rx); 909 } 910 } 911 912 void ipoib_cm_dev_stop(struct net_device *dev) 913 { 914 struct ipoib_dev_priv *priv = ipoib_priv(dev); 915 struct ipoib_cm_rx *p; 916 unsigned long begin; 917 int ret; 918 919 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 920 return; 921 922 ib_destroy_cm_id(priv->cm.id); 923 priv->cm.id = NULL; 924 925 spin_lock_irq(&priv->lock); 926 while (!list_empty(&priv->cm.passive_ids)) { 927 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 928 list_move(&p->list, &priv->cm.rx_error_list); 929 p->state = IPOIB_CM_RX_ERROR; 930 spin_unlock_irq(&priv->lock); 931 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 932 if (ret) 933 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 934 spin_lock_irq(&priv->lock); 935 } 936 937 /* Wait for all RX to be drained */ 938 begin = jiffies; 939 940 while (!list_empty(&priv->cm.rx_error_list) || 941 !list_empty(&priv->cm.rx_flush_list) || 942 !list_empty(&priv->cm.rx_drain_list)) { 943 if (time_after(jiffies, begin + 5 * HZ)) { 944 ipoib_warn(priv, "RX drain timing out\n"); 945 946 /* 947 * assume the HW is wedged and just free up everything. 948 */ 949 list_splice_init(&priv->cm.rx_flush_list, 950 &priv->cm.rx_reap_list); 951 list_splice_init(&priv->cm.rx_error_list, 952 &priv->cm.rx_reap_list); 953 list_splice_init(&priv->cm.rx_drain_list, 954 &priv->cm.rx_reap_list); 955 break; 956 } 957 spin_unlock_irq(&priv->lock); 958 usleep_range(1000, 2000); 959 ipoib_drain_cq(dev); 960 spin_lock_irq(&priv->lock); 961 } 962 963 spin_unlock_irq(&priv->lock); 964 965 ipoib_cm_free_rx_reap_list(dev); 966 967 cancel_delayed_work(&priv->cm.stale_task); 968 } 969 970 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 971 { 972 struct ipoib_cm_tx *p = cm_id->context; 973 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 974 struct ipoib_cm_data *data = event->private_data; 975 struct sk_buff_head skqueue; 976 struct ib_qp_attr qp_attr; 977 int qp_attr_mask, ret; 978 struct sk_buff *skb; 979 980 p->mtu = be32_to_cpu(data->mtu); 981 982 if (p->mtu <= IPOIB_ENCAP_LEN) { 983 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 984 p->mtu, IPOIB_ENCAP_LEN); 985 return -EINVAL; 986 } 987 988 qp_attr.qp_state = IB_QPS_RTR; 989 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 990 if (ret) { 991 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 992 return ret; 993 } 994 995 qp_attr.rq_psn = 0 /* FIXME */; 996 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 997 if (ret) { 998 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 999 return ret; 1000 } 1001 1002 qp_attr.qp_state = IB_QPS_RTS; 1003 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 1004 if (ret) { 1005 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 1006 return ret; 1007 } 1008 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 1009 if (ret) { 1010 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 1011 return ret; 1012 } 1013 1014 skb_queue_head_init(&skqueue); 1015 1016 spin_lock_irq(&priv->lock); 1017 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 1018 if (p->neigh) 1019 while ((skb = __skb_dequeue(&p->neigh->queue))) 1020 __skb_queue_tail(&skqueue, skb); 1021 spin_unlock_irq(&priv->lock); 1022 1023 while ((skb = __skb_dequeue(&skqueue))) { 1024 skb->dev = p->dev; 1025 ret = dev_queue_xmit(skb); 1026 if (ret) 1027 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n", 1028 __func__, ret); 1029 } 1030 1031 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1032 if (ret) { 1033 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1034 return ret; 1035 } 1036 return 0; 1037 } 1038 1039 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1040 { 1041 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1042 struct ib_qp_init_attr attr = { 1043 .send_cq = priv->recv_cq, 1044 .recv_cq = priv->recv_cq, 1045 .srq = priv->cm.srq, 1046 .cap.max_send_wr = ipoib_sendq_size, 1047 .cap.max_send_sge = 1, 1048 .sq_sig_type = IB_SIGNAL_ALL_WR, 1049 .qp_type = IB_QPT_RC, 1050 .qp_context = tx, 1051 .create_flags = 0 1052 }; 1053 struct ib_qp *tx_qp; 1054 1055 if (dev->features & NETIF_F_SG) 1056 attr.cap.max_send_sge = 1057 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1); 1058 1059 tx_qp = ib_create_qp(priv->pd, &attr); 1060 tx->max_send_sge = attr.cap.max_send_sge; 1061 return tx_qp; 1062 } 1063 1064 static int ipoib_cm_send_req(struct net_device *dev, 1065 struct ib_cm_id *id, struct ib_qp *qp, 1066 u32 qpn, 1067 struct sa_path_rec *pathrec) 1068 { 1069 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1070 struct ipoib_cm_data data = {}; 1071 struct ib_cm_req_param req = {}; 1072 1073 data.qpn = cpu_to_be32(priv->qp->qp_num); 1074 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1075 1076 req.primary_path = pathrec; 1077 req.alternate_path = NULL; 1078 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1079 req.qp_num = qp->qp_num; 1080 req.qp_type = qp->qp_type; 1081 req.private_data = &data; 1082 req.private_data_len = sizeof data; 1083 req.flow_control = 0; 1084 1085 req.starting_psn = 0; /* FIXME */ 1086 1087 /* 1088 * Pick some arbitrary defaults here; we could make these 1089 * module parameters if anyone cared about setting them. 1090 */ 1091 req.responder_resources = 4; 1092 req.remote_cm_response_timeout = 20; 1093 req.local_cm_response_timeout = 20; 1094 req.retry_count = 0; /* RFC draft warns against retries */ 1095 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1096 req.max_cm_retries = 15; 1097 req.srq = ipoib_cm_has_srq(dev); 1098 return ib_send_cm_req(id, &req); 1099 } 1100 1101 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1102 struct ib_cm_id *cm_id, struct ib_qp *qp) 1103 { 1104 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1105 struct ib_qp_attr qp_attr; 1106 int qp_attr_mask, ret; 1107 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1108 if (ret) { 1109 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1110 return ret; 1111 } 1112 1113 qp_attr.qp_state = IB_QPS_INIT; 1114 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1115 qp_attr.port_num = priv->port; 1116 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1117 1118 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1119 if (ret) { 1120 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1121 return ret; 1122 } 1123 return 0; 1124 } 1125 1126 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1127 struct sa_path_rec *pathrec) 1128 { 1129 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 1130 unsigned int noio_flag; 1131 int ret; 1132 1133 noio_flag = memalloc_noio_save(); 1134 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring)); 1135 if (!p->tx_ring) { 1136 ret = -ENOMEM; 1137 goto err_tx; 1138 } 1139 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1140 1141 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1142 memalloc_noio_restore(noio_flag); 1143 if (IS_ERR(p->qp)) { 1144 ret = PTR_ERR(p->qp); 1145 ipoib_warn(priv, "failed to create tx qp: %d\n", ret); 1146 goto err_qp; 1147 } 1148 1149 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1150 if (IS_ERR(p->id)) { 1151 ret = PTR_ERR(p->id); 1152 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1153 goto err_id; 1154 } 1155 1156 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1157 if (ret) { 1158 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1159 goto err_modify_send; 1160 } 1161 1162 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1163 if (ret) { 1164 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1165 goto err_modify_send; 1166 } 1167 1168 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1169 p->qp->qp_num, pathrec->dgid.raw, qpn); 1170 1171 return 0; 1172 1173 err_modify_send: 1174 ib_destroy_cm_id(p->id); 1175 err_id: 1176 p->id = NULL; 1177 ib_destroy_qp(p->qp); 1178 err_qp: 1179 p->qp = NULL; 1180 vfree(p->tx_ring); 1181 err_tx: 1182 return ret; 1183 } 1184 1185 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1186 { 1187 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 1188 struct ipoib_tx_buf *tx_req; 1189 unsigned long begin; 1190 1191 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1192 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1193 1194 if (p->id) 1195 ib_destroy_cm_id(p->id); 1196 1197 if (p->tx_ring) { 1198 /* Wait for all sends to complete */ 1199 begin = jiffies; 1200 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1201 if (time_after(jiffies, begin + 5 * HZ)) { 1202 ipoib_warn(priv, "timing out; %d sends not completed\n", 1203 p->tx_head - p->tx_tail); 1204 goto timeout; 1205 } 1206 1207 usleep_range(1000, 2000); 1208 } 1209 } 1210 1211 timeout: 1212 1213 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1214 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1215 ipoib_dma_unmap_tx(priv, tx_req); 1216 dev_kfree_skb_any(tx_req->skb); 1217 ++p->tx_tail; 1218 netif_tx_lock_bh(p->dev); 1219 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1220 netif_queue_stopped(p->dev) && 1221 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1222 netif_wake_queue(p->dev); 1223 netif_tx_unlock_bh(p->dev); 1224 } 1225 1226 if (p->qp) 1227 ib_destroy_qp(p->qp); 1228 1229 vfree(p->tx_ring); 1230 kfree(p); 1231 } 1232 1233 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1234 struct ib_cm_event *event) 1235 { 1236 struct ipoib_cm_tx *tx = cm_id->context; 1237 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev); 1238 struct net_device *dev = priv->dev; 1239 struct ipoib_neigh *neigh; 1240 unsigned long flags; 1241 int ret; 1242 1243 switch (event->event) { 1244 case IB_CM_DREQ_RECEIVED: 1245 ipoib_dbg(priv, "DREQ received.\n"); 1246 ib_send_cm_drep(cm_id, NULL, 0); 1247 break; 1248 case IB_CM_REP_RECEIVED: 1249 ipoib_dbg(priv, "REP received.\n"); 1250 ret = ipoib_cm_rep_handler(cm_id, event); 1251 if (ret) 1252 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1253 NULL, 0, NULL, 0); 1254 break; 1255 case IB_CM_REQ_ERROR: 1256 case IB_CM_REJ_RECEIVED: 1257 case IB_CM_TIMEWAIT_EXIT: 1258 ipoib_dbg(priv, "CM error %d.\n", event->event); 1259 netif_tx_lock_bh(dev); 1260 spin_lock_irqsave(&priv->lock, flags); 1261 neigh = tx->neigh; 1262 1263 if (neigh) { 1264 neigh->cm = NULL; 1265 ipoib_neigh_free(neigh); 1266 1267 tx->neigh = NULL; 1268 } 1269 1270 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1271 list_move(&tx->list, &priv->cm.reap_list); 1272 queue_work(priv->wq, &priv->cm.reap_task); 1273 } 1274 1275 spin_unlock_irqrestore(&priv->lock, flags); 1276 netif_tx_unlock_bh(dev); 1277 break; 1278 default: 1279 break; 1280 } 1281 1282 return 0; 1283 } 1284 1285 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1286 struct ipoib_neigh *neigh) 1287 { 1288 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1289 struct ipoib_cm_tx *tx; 1290 1291 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1292 if (!tx) 1293 return NULL; 1294 1295 neigh->cm = tx; 1296 tx->neigh = neigh; 1297 tx->path = path; 1298 tx->dev = dev; 1299 list_add(&tx->list, &priv->cm.start_list); 1300 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1301 queue_work(priv->wq, &priv->cm.start_task); 1302 return tx; 1303 } 1304 1305 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1306 { 1307 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev); 1308 unsigned long flags; 1309 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1310 spin_lock_irqsave(&priv->lock, flags); 1311 list_move(&tx->list, &priv->cm.reap_list); 1312 queue_work(priv->wq, &priv->cm.reap_task); 1313 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1314 tx->neigh->daddr + 4); 1315 tx->neigh = NULL; 1316 spin_unlock_irqrestore(&priv->lock, flags); 1317 } 1318 } 1319 1320 #define QPN_AND_OPTIONS_OFFSET 4 1321 1322 static void ipoib_cm_tx_start(struct work_struct *work) 1323 { 1324 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1325 cm.start_task); 1326 struct net_device *dev = priv->dev; 1327 struct ipoib_neigh *neigh; 1328 struct ipoib_cm_tx *p; 1329 unsigned long flags; 1330 struct ipoib_path *path; 1331 int ret; 1332 1333 struct sa_path_rec pathrec; 1334 u32 qpn; 1335 1336 netif_tx_lock_bh(dev); 1337 spin_lock_irqsave(&priv->lock, flags); 1338 1339 while (!list_empty(&priv->cm.start_list)) { 1340 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1341 list_del_init(&p->list); 1342 neigh = p->neigh; 1343 1344 qpn = IPOIB_QPN(neigh->daddr); 1345 /* 1346 * As long as the search is with these 2 locks, 1347 * path existence indicates its validity. 1348 */ 1349 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1350 if (!path) { 1351 pr_info("%s ignore not valid path %pI6\n", 1352 __func__, 1353 neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1354 goto free_neigh; 1355 } 1356 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1357 1358 spin_unlock_irqrestore(&priv->lock, flags); 1359 netif_tx_unlock_bh(dev); 1360 1361 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1362 1363 netif_tx_lock_bh(dev); 1364 spin_lock_irqsave(&priv->lock, flags); 1365 1366 if (ret) { 1367 free_neigh: 1368 neigh = p->neigh; 1369 if (neigh) { 1370 neigh->cm = NULL; 1371 ipoib_neigh_free(neigh); 1372 } 1373 list_del(&p->list); 1374 kfree(p); 1375 } 1376 } 1377 1378 spin_unlock_irqrestore(&priv->lock, flags); 1379 netif_tx_unlock_bh(dev); 1380 } 1381 1382 static void ipoib_cm_tx_reap(struct work_struct *work) 1383 { 1384 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1385 cm.reap_task); 1386 struct net_device *dev = priv->dev; 1387 struct ipoib_cm_tx *p; 1388 unsigned long flags; 1389 1390 netif_tx_lock_bh(dev); 1391 spin_lock_irqsave(&priv->lock, flags); 1392 1393 while (!list_empty(&priv->cm.reap_list)) { 1394 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1395 list_del_init(&p->list); 1396 spin_unlock_irqrestore(&priv->lock, flags); 1397 netif_tx_unlock_bh(dev); 1398 ipoib_cm_tx_destroy(p); 1399 netif_tx_lock_bh(dev); 1400 spin_lock_irqsave(&priv->lock, flags); 1401 } 1402 1403 spin_unlock_irqrestore(&priv->lock, flags); 1404 netif_tx_unlock_bh(dev); 1405 } 1406 1407 static void ipoib_cm_skb_reap(struct work_struct *work) 1408 { 1409 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1410 cm.skb_task); 1411 struct net_device *dev = priv->dev; 1412 struct sk_buff *skb; 1413 unsigned long flags; 1414 unsigned mtu = priv->mcast_mtu; 1415 1416 netif_tx_lock_bh(dev); 1417 spin_lock_irqsave(&priv->lock, flags); 1418 1419 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1420 spin_unlock_irqrestore(&priv->lock, flags); 1421 netif_tx_unlock_bh(dev); 1422 1423 if (skb->protocol == htons(ETH_P_IP)) 1424 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1425 #if IS_ENABLED(CONFIG_IPV6) 1426 else if (skb->protocol == htons(ETH_P_IPV6)) 1427 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1428 #endif 1429 dev_kfree_skb_any(skb); 1430 1431 netif_tx_lock_bh(dev); 1432 spin_lock_irqsave(&priv->lock, flags); 1433 } 1434 1435 spin_unlock_irqrestore(&priv->lock, flags); 1436 netif_tx_unlock_bh(dev); 1437 } 1438 1439 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1440 unsigned int mtu) 1441 { 1442 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1443 int e = skb_queue_empty(&priv->cm.skb_queue); 1444 1445 if (skb_dst(skb)) 1446 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1447 1448 skb_queue_tail(&priv->cm.skb_queue, skb); 1449 if (e) 1450 queue_work(priv->wq, &priv->cm.skb_task); 1451 } 1452 1453 static void ipoib_cm_rx_reap(struct work_struct *work) 1454 { 1455 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1456 cm.rx_reap_task)->dev); 1457 } 1458 1459 static void ipoib_cm_stale_task(struct work_struct *work) 1460 { 1461 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1462 cm.stale_task.work); 1463 struct ipoib_cm_rx *p; 1464 int ret; 1465 1466 spin_lock_irq(&priv->lock); 1467 while (!list_empty(&priv->cm.passive_ids)) { 1468 /* List is sorted by LRU, start from tail, 1469 * stop when we see a recently used entry */ 1470 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1471 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1472 break; 1473 list_move(&p->list, &priv->cm.rx_error_list); 1474 p->state = IPOIB_CM_RX_ERROR; 1475 spin_unlock_irq(&priv->lock); 1476 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1477 if (ret) 1478 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1479 spin_lock_irq(&priv->lock); 1480 } 1481 1482 if (!list_empty(&priv->cm.passive_ids)) 1483 queue_delayed_work(priv->wq, 1484 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1485 spin_unlock_irq(&priv->lock); 1486 } 1487 1488 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1489 char *buf) 1490 { 1491 struct net_device *dev = to_net_dev(d); 1492 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1493 1494 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1495 return sprintf(buf, "connected\n"); 1496 else 1497 return sprintf(buf, "datagram\n"); 1498 } 1499 1500 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1501 const char *buf, size_t count) 1502 { 1503 struct net_device *dev = to_net_dev(d); 1504 int ret; 1505 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1506 1507 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags)) 1508 return -EPERM; 1509 1510 if (!rtnl_trylock()) 1511 return restart_syscall(); 1512 1513 ret = ipoib_set_mode(dev, buf); 1514 1515 /* The assumption is that the function ipoib_set_mode returned 1516 * with the rtnl held by it, if not the value -EBUSY returned, 1517 * then no need to rtnl_unlock 1518 */ 1519 if (ret != -EBUSY) 1520 rtnl_unlock(); 1521 1522 return (!ret || ret == -EBUSY) ? count : ret; 1523 } 1524 1525 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1526 1527 int ipoib_cm_add_mode_attr(struct net_device *dev) 1528 { 1529 return device_create_file(&dev->dev, &dev_attr_mode); 1530 } 1531 1532 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1533 { 1534 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1535 struct ib_srq_init_attr srq_init_attr = { 1536 .srq_type = IB_SRQT_BASIC, 1537 .attr = { 1538 .max_wr = ipoib_recvq_size, 1539 .max_sge = max_sge 1540 } 1541 }; 1542 1543 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1544 if (IS_ERR(priv->cm.srq)) { 1545 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1546 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1547 priv->ca->name, PTR_ERR(priv->cm.srq)); 1548 priv->cm.srq = NULL; 1549 return; 1550 } 1551 1552 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1553 if (!priv->cm.srq_ring) { 1554 ib_destroy_srq(priv->cm.srq); 1555 priv->cm.srq = NULL; 1556 return; 1557 } 1558 1559 } 1560 1561 int ipoib_cm_dev_init(struct net_device *dev) 1562 { 1563 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1564 int max_srq_sge, i; 1565 1566 INIT_LIST_HEAD(&priv->cm.passive_ids); 1567 INIT_LIST_HEAD(&priv->cm.reap_list); 1568 INIT_LIST_HEAD(&priv->cm.start_list); 1569 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1570 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1571 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1572 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1573 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1574 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1575 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1576 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1577 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1578 1579 skb_queue_head_init(&priv->cm.skb_queue); 1580 1581 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge); 1582 1583 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge); 1584 ipoib_cm_create_srq(dev, max_srq_sge); 1585 if (ipoib_cm_has_srq(dev)) { 1586 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10; 1587 priv->cm.num_frags = max_srq_sge; 1588 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1589 priv->cm.max_cm_mtu, priv->cm.num_frags); 1590 } else { 1591 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1592 priv->cm.num_frags = IPOIB_CM_RX_SG; 1593 } 1594 1595 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1596 1597 if (ipoib_cm_has_srq(dev)) { 1598 for (i = 0; i < ipoib_recvq_size; ++i) { 1599 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1600 priv->cm.num_frags - 1, 1601 priv->cm.srq_ring[i].mapping, 1602 GFP_KERNEL)) { 1603 ipoib_warn(priv, "failed to allocate " 1604 "receive buffer %d\n", i); 1605 ipoib_cm_dev_cleanup(dev); 1606 return -ENOMEM; 1607 } 1608 1609 if (ipoib_cm_post_receive_srq(dev, i)) { 1610 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1611 "failed for buf %d\n", i); 1612 ipoib_cm_dev_cleanup(dev); 1613 return -EIO; 1614 } 1615 } 1616 } 1617 1618 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1619 return 0; 1620 } 1621 1622 void ipoib_cm_dev_cleanup(struct net_device *dev) 1623 { 1624 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1625 int ret; 1626 1627 if (!priv->cm.srq) 1628 return; 1629 1630 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1631 1632 ret = ib_destroy_srq(priv->cm.srq); 1633 if (ret) 1634 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1635 1636 priv->cm.srq = NULL; 1637 if (!priv->cm.srq_ring) 1638 return; 1639 1640 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1641 priv->cm.srq_ring = NULL; 1642 } 1643