1/* 2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved. 3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34#include <linux/sched.h> 35#include <rdma/ib_smi.h> 36 37#include "ipath_verbs.h" 38#include "ipath_kernel.h" 39 40/** 41 * ipath_ud_loopback - handle send on loopback QPs 42 * @sqp: the sending QP 43 * @swqe: the send work request 44 * 45 * This is called from ipath_make_ud_req() to forward a WQE addressed 46 * to the same HCA. 47 * Note that the receive interrupt handler may be calling ipath_ud_rcv() 48 * while this is being called. 49 */ 50static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe) 51{ 52 struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); 53 struct ipath_qp *qp; 54 struct ib_ah_attr *ah_attr; 55 unsigned long flags; 56 struct ipath_rq *rq; 57 struct ipath_srq *srq; 58 struct ipath_sge_state rsge; 59 struct ipath_sge *sge; 60 struct ipath_rwq *wq; 61 struct ipath_rwqe *wqe; 62 void (*handler)(struct ib_event *, void *); 63 struct ib_wc wc; 64 u32 tail; 65 u32 rlen; 66 u32 length; 67 68 qp = ipath_lookup_qpn(&dev->qp_table, swqe->wr.wr.ud.remote_qpn); 69 if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) { 70 dev->n_pkt_drops++; 71 goto done; 72 } 73 74 /* 75 * Check that the qkey matches (except for QP0, see 9.6.1.4.1). 76 * Qkeys with the high order bit set mean use the 77 * qkey from the QP context instead of the WR (see 10.2.5). 78 */ 79 if (unlikely(qp->ibqp.qp_num && 80 ((int) swqe->wr.wr.ud.remote_qkey < 0 ? 81 sqp->qkey : swqe->wr.wr.ud.remote_qkey) != qp->qkey)) { 82 /* XXX OK to lose a count once in a while. */ 83 dev->qkey_violations++; 84 dev->n_pkt_drops++; 85 goto drop; 86 } 87 88 /* 89 * A GRH is expected to precede the data even if not 90 * present on the wire. 91 */ 92 length = swqe->length; 93 memset(&wc, 0, sizeof wc); 94 wc.byte_len = length + sizeof(struct ib_grh); 95 96 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 97 wc.wc_flags = IB_WC_WITH_IMM; 98 wc.ex.imm_data = swqe->wr.ex.imm_data; 99 } 100 101 /* 102 * This would be a lot simpler if we could call ipath_get_rwqe() 103 * but that uses state that the receive interrupt handler uses 104 * so we would need to lock out receive interrupts while doing 105 * local loopback. 106 */ 107 if (qp->ibqp.srq) { 108 srq = to_isrq(qp->ibqp.srq); 109 handler = srq->ibsrq.event_handler; 110 rq = &srq->rq; 111 } else { 112 srq = NULL; 113 handler = NULL; 114 rq = &qp->r_rq; 115 } 116 117 /* 118 * Get the next work request entry to find where to put the data. 119 * Note that it is safe to drop the lock after changing rq->tail 120 * since ipath_post_receive() won't fill the empty slot. 121 */ 122 spin_lock_irqsave(&rq->lock, flags); 123 wq = rq->wq; 124 tail = wq->tail; 125 /* Validate tail before using it since it is user writable. */ 126 if (tail >= rq->size) 127 tail = 0; 128 if (unlikely(tail == wq->head)) { 129 spin_unlock_irqrestore(&rq->lock, flags); 130 dev->n_pkt_drops++; 131 goto drop; 132 } 133 wqe = get_rwqe_ptr(rq, tail); 134 rsge.sg_list = qp->r_ud_sg_list; 135 if (!ipath_init_sge(qp, wqe, &rlen, &rsge)) { 136 spin_unlock_irqrestore(&rq->lock, flags); 137 dev->n_pkt_drops++; 138 goto drop; 139 } 140 /* Silently drop packets which are too big. */ 141 if (wc.byte_len > rlen) { 142 spin_unlock_irqrestore(&rq->lock, flags); 143 dev->n_pkt_drops++; 144 goto drop; 145 } 146 if (++tail >= rq->size) 147 tail = 0; 148 wq->tail = tail; 149 wc.wr_id = wqe->wr_id; 150 if (handler) { 151 u32 n; 152 153 /* 154 * validate head pointer value and compute 155 * the number of remaining WQEs. 156 */ 157 n = wq->head; 158 if (n >= rq->size) 159 n = 0; 160 if (n < tail) 161 n += rq->size - tail; 162 else 163 n -= tail; 164 if (n < srq->limit) { 165 struct ib_event ev; 166 167 srq->limit = 0; 168 spin_unlock_irqrestore(&rq->lock, flags); 169 ev.device = qp->ibqp.device; 170 ev.element.srq = qp->ibqp.srq; 171 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 172 handler(&ev, srq->ibsrq.srq_context); 173 } else 174 spin_unlock_irqrestore(&rq->lock, flags); 175 } else 176 spin_unlock_irqrestore(&rq->lock, flags); 177 178 ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr; 179 if (ah_attr->ah_flags & IB_AH_GRH) { 180 ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh)); 181 wc.wc_flags |= IB_WC_GRH; 182 } else 183 ipath_skip_sge(&rsge, sizeof(struct ib_grh)); 184 sge = swqe->sg_list; 185 while (length) { 186 u32 len = sge->length; 187 188 if (len > length) 189 len = length; 190 if (len > sge->sge_length) 191 len = sge->sge_length; 192 BUG_ON(len == 0); 193 ipath_copy_sge(&rsge, sge->vaddr, len); 194 sge->vaddr += len; 195 sge->length -= len; 196 sge->sge_length -= len; 197 if (sge->sge_length == 0) { 198 if (--swqe->wr.num_sge) 199 sge++; 200 } else if (sge->length == 0 && sge->mr != NULL) { 201 if (++sge->n >= IPATH_SEGSZ) { 202 if (++sge->m >= sge->mr->mapsz) 203 break; 204 sge->n = 0; 205 } 206 sge->vaddr = 207 sge->mr->map[sge->m]->segs[sge->n].vaddr; 208 sge->length = 209 sge->mr->map[sge->m]->segs[sge->n].length; 210 } 211 length -= len; 212 } 213 wc.status = IB_WC_SUCCESS; 214 wc.opcode = IB_WC_RECV; 215 wc.qp = &qp->ibqp; 216 wc.src_qp = sqp->ibqp.qp_num; 217 /* XXX do we know which pkey matched? Only needed for GSI. */ 218 wc.pkey_index = 0; 219 wc.slid = dev->dd->ipath_lid | 220 (ah_attr->src_path_bits & 221 ((1 << dev->dd->ipath_lmc) - 1)); 222 wc.sl = ah_attr->sl; 223 wc.dlid_path_bits = 224 ah_attr->dlid & ((1 << dev->dd->ipath_lmc) - 1); 225 wc.port_num = 1; 226 /* Signal completion event if the solicited bit is set. */ 227 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 228 swqe->wr.send_flags & IB_SEND_SOLICITED); 229drop: 230 if (atomic_dec_and_test(&qp->refcount)) 231 wake_up(&qp->wait); 232done:; 233} 234 235/** 236 * ipath_make_ud_req - construct a UD request packet 237 * @qp: the QP 238 * 239 * Return 1 if constructed; otherwise, return 0. 240 */ 241int ipath_make_ud_req(struct ipath_qp *qp) 242{ 243 struct ipath_ibdev *dev = to_idev(qp->ibqp.device); 244 struct ipath_other_headers *ohdr; 245 struct ib_ah_attr *ah_attr; 246 struct ipath_swqe *wqe; 247 unsigned long flags; 248 u32 nwords; 249 u32 extra_bytes; 250 u32 bth0; 251 u16 lrh0; 252 u16 lid; 253 int ret = 0; 254 int next_cur; 255 256 spin_lock_irqsave(&qp->s_lock, flags); 257 258 if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_NEXT_SEND_OK)) { 259 if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND)) 260 goto bail; 261 /* We are in the error state, flush the work request. */ 262 if (qp->s_last == qp->s_head) 263 goto bail; 264 /* If DMAs are in progress, we can't flush immediately. */ 265 if (atomic_read(&qp->s_dma_busy)) { 266 qp->s_flags |= IPATH_S_WAIT_DMA; 267 goto bail; 268 } 269 wqe = get_swqe_ptr(qp, qp->s_last); 270 ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 271 goto done; 272 } 273 274 if (qp->s_cur == qp->s_head) 275 goto bail; 276 277 wqe = get_swqe_ptr(qp, qp->s_cur); 278 next_cur = qp->s_cur + 1; 279 if (next_cur >= qp->s_size) 280 next_cur = 0; 281 282 /* Construct the header. */ 283 ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr; 284 if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) { 285 if (ah_attr->dlid != IPATH_PERMISSIVE_LID) 286 dev->n_multicast_xmit++; 287 else 288 dev->n_unicast_xmit++; 289 } else { 290 dev->n_unicast_xmit++; 291 lid = ah_attr->dlid & ~((1 << dev->dd->ipath_lmc) - 1); 292 if (unlikely(lid == dev->dd->ipath_lid)) { 293 /* 294 * If DMAs are in progress, we can't generate 295 * a completion for the loopback packet since 296 * it would be out of order. 297 * XXX Instead of waiting, we could queue a 298 * zero length descriptor so we get a callback. 299 */ 300 if (atomic_read(&qp->s_dma_busy)) { 301 qp->s_flags |= IPATH_S_WAIT_DMA; 302 goto bail; 303 } 304 qp->s_cur = next_cur; 305 spin_unlock_irqrestore(&qp->s_lock, flags); 306 ipath_ud_loopback(qp, wqe); 307 spin_lock_irqsave(&qp->s_lock, flags); 308 ipath_send_complete(qp, wqe, IB_WC_SUCCESS); 309 goto done; 310 } 311 } 312 313 qp->s_cur = next_cur; 314 extra_bytes = -wqe->length & 3; 315 nwords = (wqe->length + extra_bytes) >> 2; 316 317 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 318 qp->s_hdrwords = 7; 319 qp->s_cur_size = wqe->length; 320 qp->s_cur_sge = &qp->s_sge; 321 qp->s_dmult = ah_attr->static_rate; 322 qp->s_wqe = wqe; 323 qp->s_sge.sge = wqe->sg_list[0]; 324 qp->s_sge.sg_list = wqe->sg_list + 1; 325 qp->s_sge.num_sge = wqe->wr.num_sge; 326 327 if (ah_attr->ah_flags & IB_AH_GRH) { 328 /* Header size in 32-bit words. */ 329 qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, 330 &ah_attr->grh, 331 qp->s_hdrwords, nwords); 332 lrh0 = IPATH_LRH_GRH; 333 ohdr = &qp->s_hdr.u.l.oth; 334 /* 335 * Don't worry about sending to locally attached multicast 336 * QPs. It is unspecified by the spec. what happens. 337 */ 338 } else { 339 /* Header size in 32-bit words. */ 340 lrh0 = IPATH_LRH_BTH; 341 ohdr = &qp->s_hdr.u.oth; 342 } 343 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 344 qp->s_hdrwords++; 345 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 346 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 347 } else 348 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 349 lrh0 |= ah_attr->sl << 4; 350 if (qp->ibqp.qp_type == IB_QPT_SMI) 351 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 352 qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); 353 qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */ 354 qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + 355 SIZE_OF_CRC); 356 lid = dev->dd->ipath_lid; 357 if (lid) { 358 lid |= ah_attr->src_path_bits & 359 ((1 << dev->dd->ipath_lmc) - 1); 360 qp->s_hdr.lrh[3] = cpu_to_be16(lid); 361 } else 362 qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE; 363 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 364 bth0 |= 1 << 23; 365 bth0 |= extra_bytes << 20; 366 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY : 367 ipath_get_pkey(dev->dd, qp->s_pkey_index); 368 ohdr->bth[0] = cpu_to_be32(bth0); 369 /* 370 * Use the multicast QP if the destination LID is a multicast LID. 371 */ 372 ohdr->bth[1] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE && 373 ah_attr->dlid != IPATH_PERMISSIVE_LID ? 374 cpu_to_be32(IPATH_MULTICAST_QPN) : 375 cpu_to_be32(wqe->wr.wr.ud.remote_qpn); 376 ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_PSN_MASK); 377 /* 378 * Qkeys with the high order bit set mean use the 379 * qkey from the QP context instead of the WR (see 10.2.5). 380 */ 381 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ? 382 qp->qkey : wqe->wr.wr.ud.remote_qkey); 383 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 384 385done: 386 ret = 1; 387 goto unlock; 388 389bail: 390 qp->s_flags &= ~IPATH_S_BUSY; 391unlock: 392 spin_unlock_irqrestore(&qp->s_lock, flags); 393 return ret; 394} 395 396/** 397 * ipath_ud_rcv - receive an incoming UD packet 398 * @dev: the device the packet came in on 399 * @hdr: the packet header 400 * @has_grh: true if the packet has a GRH 401 * @data: the packet data 402 * @tlen: the packet length 403 * @qp: the QP the packet came on 404 * 405 * This is called from ipath_qp_rcv() to process an incoming UD packet 406 * for the given QP. 407 * Called at interrupt level. 408 */ 409void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, 410 int has_grh, void *data, u32 tlen, struct ipath_qp *qp) 411{ 412 struct ipath_other_headers *ohdr; 413 int opcode; 414 u32 hdrsize; 415 u32 pad; 416 struct ib_wc wc; 417 u32 qkey; 418 u32 src_qp; 419 u16 dlid; 420 int header_in_data; 421 422 /* Check for GRH */ 423 if (!has_grh) { 424 ohdr = &hdr->u.oth; 425 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 426 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 427 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); 428 header_in_data = 0; 429 } else { 430 ohdr = &hdr->u.l.oth; 431 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 432 /* 433 * The header with GRH is 68 bytes and the core driver sets 434 * the eager header buffer size to 56 bytes so the last 12 435 * bytes of the IB header is in the data buffer. 436 */ 437 header_in_data = dev->dd->ipath_rcvhdrentsize == 16; 438 if (header_in_data) { 439 qkey = be32_to_cpu(((__be32 *) data)[1]); 440 src_qp = be32_to_cpu(((__be32 *) data)[2]); 441 data += 12; 442 } else { 443 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 444 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); 445 } 446 } 447 src_qp &= IPATH_QPN_MASK; 448 449 /* 450 * Check that the permissive LID is only used on QP0 451 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 452 */ 453 if (qp->ibqp.qp_num) { 454 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 455 hdr->lrh[3] == IB_LID_PERMISSIVE)) { 456 dev->n_pkt_drops++; 457 goto bail; 458 } 459 if (unlikely(qkey != qp->qkey)) { 460 /* XXX OK to lose a count once in a while. */ 461 dev->qkey_violations++; 462 dev->n_pkt_drops++; 463 goto bail; 464 } 465 } else if (hdr->lrh[1] == IB_LID_PERMISSIVE || 466 hdr->lrh[3] == IB_LID_PERMISSIVE) { 467 struct ib_smp *smp = (struct ib_smp *) data; 468 469 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 470 dev->n_pkt_drops++; 471 goto bail; 472 } 473 } 474 475 /* 476 * The opcode is in the low byte when its in network order 477 * (top byte when in host order). 478 */ 479 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 480 if (qp->ibqp.qp_num > 1 && 481 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 482 if (header_in_data) { 483 wc.ex.imm_data = *(__be32 *) data; 484 data += sizeof(__be32); 485 } else 486 wc.ex.imm_data = ohdr->u.ud.imm_data; 487 wc.wc_flags = IB_WC_WITH_IMM; 488 hdrsize += sizeof(u32); 489 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 490 wc.ex.imm_data = 0; 491 wc.wc_flags = 0; 492 } else { 493 dev->n_pkt_drops++; 494 goto bail; 495 } 496 497 /* Get the number of bytes the message was padded by. */ 498 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 499 if (unlikely(tlen < (hdrsize + pad + 4))) { 500 /* Drop incomplete packets. */ 501 dev->n_pkt_drops++; 502 goto bail; 503 } 504 tlen -= hdrsize + pad + 4; 505 506 /* Drop invalid MAD packets (see 13.5.3.1). */ 507 if (unlikely((qp->ibqp.qp_num == 0 && 508 (tlen != 256 || 509 (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) || 510 (qp->ibqp.qp_num == 1 && 511 (tlen != 256 || 512 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) { 513 dev->n_pkt_drops++; 514 goto bail; 515 } 516 517 /* 518 * A GRH is expected to precede the data even if not 519 * present on the wire. 520 */ 521 wc.byte_len = tlen + sizeof(struct ib_grh); 522 523 /* 524 * Get the next work request entry to find where to put the data. 525 */ 526 if (qp->r_flags & IPATH_R_REUSE_SGE) 527 qp->r_flags &= ~IPATH_R_REUSE_SGE; 528 else if (!ipath_get_rwqe(qp, 0)) { 529 /* 530 * Count VL15 packets dropped due to no receive buffer. 531 * Otherwise, count them as buffer overruns since usually, 532 * the HW will be able to receive packets even if there are 533 * no QPs with posted receive buffers. 534 */ 535 if (qp->ibqp.qp_num == 0) 536 dev->n_vl15_dropped++; 537 else 538 dev->rcv_errors++; 539 goto bail; 540 } 541 /* Silently drop packets which are too big. */ 542 if (wc.byte_len > qp->r_len) { 543 qp->r_flags |= IPATH_R_REUSE_SGE; 544 dev->n_pkt_drops++; 545 goto bail; 546 } 547 if (has_grh) { 548 ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh, 549 sizeof(struct ib_grh)); 550 wc.wc_flags |= IB_WC_GRH; 551 } else 552 ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh)); 553 ipath_copy_sge(&qp->r_sge, data, 554 wc.byte_len - sizeof(struct ib_grh)); 555 if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags)) 556 goto bail; 557 wc.wr_id = qp->r_wr_id; 558 wc.status = IB_WC_SUCCESS; 559 wc.opcode = IB_WC_RECV; 560 wc.vendor_err = 0; 561 wc.qp = &qp->ibqp; 562 wc.src_qp = src_qp; 563 /* XXX do we know which pkey matched? Only needed for GSI. */ 564 wc.pkey_index = 0; 565 wc.slid = be16_to_cpu(hdr->lrh[3]); 566 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; 567 dlid = be16_to_cpu(hdr->lrh[1]); 568 /* 569 * Save the LMC lower bits if the destination LID is a unicast LID. 570 */ 571 wc.dlid_path_bits = dlid >= IPATH_MULTICAST_LID_BASE ? 0 : 572 dlid & ((1 << dev->dd->ipath_lmc) - 1); 573 wc.port_num = 1; 574 /* Signal completion event if the solicited bit is set. */ 575 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 576 (ohdr->bth[0] & 577 cpu_to_be32(1 << 23)) != 0); 578 579bail:; 580} 581