1 /* 2 * Copyright(c) 2015, 2016 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/net.h> 49 #include <rdma/ib_smi.h> 50 51 #include "hfi.h" 52 #include "mad.h" 53 #include "verbs_txreq.h" 54 #include "qp.h" 55 56 /** 57 * ud_loopback - handle send on loopback QPs 58 * @sqp: the sending QP 59 * @swqe: the send work request 60 * 61 * This is called from hfi1_make_ud_req() to forward a WQE addressed 62 * to the same HFI. 63 * Note that the receive interrupt handler may be calling hfi1_ud_rcv() 64 * while this is being called. 65 */ 66 static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe) 67 { 68 struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 69 struct hfi1_pportdata *ppd; 70 struct rvt_qp *qp; 71 struct ib_ah_attr *ah_attr; 72 unsigned long flags; 73 struct rvt_sge_state ssge; 74 struct rvt_sge *sge; 75 struct ib_wc wc; 76 u32 length; 77 enum ib_qp_type sqptype, dqptype; 78 79 rcu_read_lock(); 80 81 qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp, 82 swqe->ud_wr.remote_qpn); 83 if (!qp) { 84 ibp->rvp.n_pkt_drops++; 85 rcu_read_unlock(); 86 return; 87 } 88 89 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ? 90 IB_QPT_UD : sqp->ibqp.qp_type; 91 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ? 92 IB_QPT_UD : qp->ibqp.qp_type; 93 94 if (dqptype != sqptype || 95 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 96 ibp->rvp.n_pkt_drops++; 97 goto drop; 98 } 99 100 ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr; 101 ppd = ppd_from_ibp(ibp); 102 103 if (qp->ibqp.qp_num > 1) { 104 u16 pkey; 105 u16 slid; 106 u8 sc5 = ibp->sl_to_sc[ah_attr->sl]; 107 108 pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index); 109 slid = ppd->lid | (ah_attr->src_path_bits & 110 ((1 << ppd->lmc) - 1)); 111 if (unlikely(ingress_pkey_check(ppd, pkey, sc5, 112 qp->s_pkey_index, slid))) { 113 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_P_KEY, pkey, 114 ah_attr->sl, 115 sqp->ibqp.qp_num, qp->ibqp.qp_num, 116 slid, ah_attr->dlid); 117 goto drop; 118 } 119 } 120 121 /* 122 * Check that the qkey matches (except for QP0, see 9.6.1.4.1). 123 * Qkeys with the high order bit set mean use the 124 * qkey from the QP context instead of the WR (see 10.2.5). 125 */ 126 if (qp->ibqp.qp_num) { 127 u32 qkey; 128 129 qkey = (int)swqe->ud_wr.remote_qkey < 0 ? 130 sqp->qkey : swqe->ud_wr.remote_qkey; 131 if (unlikely(qkey != qp->qkey)) { 132 u16 lid; 133 134 lid = ppd->lid | (ah_attr->src_path_bits & 135 ((1 << ppd->lmc) - 1)); 136 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_Q_KEY, qkey, 137 ah_attr->sl, 138 sqp->ibqp.qp_num, qp->ibqp.qp_num, 139 lid, 140 ah_attr->dlid); 141 goto drop; 142 } 143 } 144 145 /* 146 * A GRH is expected to precede the data even if not 147 * present on the wire. 148 */ 149 length = swqe->length; 150 memset(&wc, 0, sizeof(wc)); 151 wc.byte_len = length + sizeof(struct ib_grh); 152 153 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 154 wc.wc_flags = IB_WC_WITH_IMM; 155 wc.ex.imm_data = swqe->wr.ex.imm_data; 156 } 157 158 spin_lock_irqsave(&qp->r_lock, flags); 159 160 /* 161 * Get the next work request entry to find where to put the data. 162 */ 163 if (qp->r_flags & RVT_R_REUSE_SGE) { 164 qp->r_flags &= ~RVT_R_REUSE_SGE; 165 } else { 166 int ret; 167 168 ret = hfi1_rvt_get_rwqe(qp, 0); 169 if (ret < 0) { 170 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 171 goto bail_unlock; 172 } 173 if (!ret) { 174 if (qp->ibqp.qp_num == 0) 175 ibp->rvp.n_vl15_dropped++; 176 goto bail_unlock; 177 } 178 } 179 /* Silently drop packets which are too big. */ 180 if (unlikely(wc.byte_len > qp->r_len)) { 181 qp->r_flags |= RVT_R_REUSE_SGE; 182 ibp->rvp.n_pkt_drops++; 183 goto bail_unlock; 184 } 185 186 if (ah_attr->ah_flags & IB_AH_GRH) { 187 struct ib_grh grh; 188 struct ib_global_route grd = ah_attr->grh; 189 190 hfi1_make_grh(ibp, &grh, &grd, 0, 0); 191 hfi1_copy_sge(&qp->r_sge, &grh, 192 sizeof(grh), true, false); 193 wc.wc_flags |= IB_WC_GRH; 194 } else { 195 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 196 } 197 ssge.sg_list = swqe->sg_list + 1; 198 ssge.sge = *swqe->sg_list; 199 ssge.num_sge = swqe->wr.num_sge; 200 sge = &ssge.sge; 201 while (length) { 202 u32 len = sge->length; 203 204 if (len > length) 205 len = length; 206 if (len > sge->sge_length) 207 len = sge->sge_length; 208 WARN_ON_ONCE(len == 0); 209 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, true, false); 210 sge->vaddr += len; 211 sge->length -= len; 212 sge->sge_length -= len; 213 if (sge->sge_length == 0) { 214 if (--ssge.num_sge) 215 *sge = *ssge.sg_list++; 216 } else if (sge->length == 0 && sge->mr->lkey) { 217 if (++sge->n >= RVT_SEGSZ) { 218 if (++sge->m >= sge->mr->mapsz) 219 break; 220 sge->n = 0; 221 } 222 sge->vaddr = 223 sge->mr->map[sge->m]->segs[sge->n].vaddr; 224 sge->length = 225 sge->mr->map[sge->m]->segs[sge->n].length; 226 } 227 length -= len; 228 } 229 rvt_put_ss(&qp->r_sge); 230 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 231 goto bail_unlock; 232 wc.wr_id = qp->r_wr_id; 233 wc.status = IB_WC_SUCCESS; 234 wc.opcode = IB_WC_RECV; 235 wc.qp = &qp->ibqp; 236 wc.src_qp = sqp->ibqp.qp_num; 237 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) { 238 if (sqp->ibqp.qp_type == IB_QPT_GSI || 239 sqp->ibqp.qp_type == IB_QPT_SMI) 240 wc.pkey_index = swqe->ud_wr.pkey_index; 241 else 242 wc.pkey_index = sqp->s_pkey_index; 243 } else { 244 wc.pkey_index = 0; 245 } 246 wc.slid = ppd->lid | (ah_attr->src_path_bits & ((1 << ppd->lmc) - 1)); 247 /* Check for loopback when the port lid is not set */ 248 if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI) 249 wc.slid = be16_to_cpu(IB_LID_PERMISSIVE); 250 wc.sl = ah_attr->sl; 251 wc.dlid_path_bits = ah_attr->dlid & ((1 << ppd->lmc) - 1); 252 wc.port_num = qp->port_num; 253 /* Signal completion event if the solicited bit is set. */ 254 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 255 swqe->wr.send_flags & IB_SEND_SOLICITED); 256 ibp->rvp.n_loop_pkts++; 257 bail_unlock: 258 spin_unlock_irqrestore(&qp->r_lock, flags); 259 drop: 260 rcu_read_unlock(); 261 } 262 263 /** 264 * hfi1_make_ud_req - construct a UD request packet 265 * @qp: the QP 266 * 267 * Assume s_lock is held. 268 * 269 * Return 1 if constructed; otherwise, return 0. 270 */ 271 int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) 272 { 273 struct hfi1_qp_priv *priv = qp->priv; 274 struct ib_other_headers *ohdr; 275 struct ib_ah_attr *ah_attr; 276 struct hfi1_pportdata *ppd; 277 struct hfi1_ibport *ibp; 278 struct rvt_swqe *wqe; 279 u32 nwords; 280 u32 extra_bytes; 281 u32 bth0; 282 u16 lrh0; 283 u16 lid; 284 int next_cur; 285 u8 sc5; 286 287 ps->s_txreq = get_txreq(ps->dev, qp); 288 if (IS_ERR(ps->s_txreq)) 289 goto bail_no_tx; 290 291 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 292 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 293 goto bail; 294 /* We are in the error state, flush the work request. */ 295 smp_read_barrier_depends(); /* see post_one_send */ 296 if (qp->s_last == ACCESS_ONCE(qp->s_head)) 297 goto bail; 298 /* If DMAs are in progress, we can't flush immediately. */ 299 if (iowait_sdma_pending(&priv->s_iowait)) { 300 qp->s_flags |= RVT_S_WAIT_DMA; 301 goto bail; 302 } 303 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 304 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 305 goto done_free_tx; 306 } 307 308 /* see post_one_send() */ 309 smp_read_barrier_depends(); 310 if (qp->s_cur == ACCESS_ONCE(qp->s_head)) 311 goto bail; 312 313 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 314 next_cur = qp->s_cur + 1; 315 if (next_cur >= qp->s_size) 316 next_cur = 0; 317 318 /* Construct the header. */ 319 ibp = to_iport(qp->ibqp.device, qp->port_num); 320 ppd = ppd_from_ibp(ibp); 321 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; 322 if (ah_attr->dlid < be16_to_cpu(IB_MULTICAST_LID_BASE) || 323 ah_attr->dlid == be16_to_cpu(IB_LID_PERMISSIVE)) { 324 lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1); 325 if (unlikely(!loopback && 326 (lid == ppd->lid || 327 (lid == be16_to_cpu(IB_LID_PERMISSIVE) && 328 qp->ibqp.qp_type == IB_QPT_GSI)))) { 329 unsigned long tflags = ps->flags; 330 /* 331 * If DMAs are in progress, we can't generate 332 * a completion for the loopback packet since 333 * it would be out of order. 334 * Instead of waiting, we could queue a 335 * zero length descriptor so we get a callback. 336 */ 337 if (iowait_sdma_pending(&priv->s_iowait)) { 338 qp->s_flags |= RVT_S_WAIT_DMA; 339 goto bail; 340 } 341 qp->s_cur = next_cur; 342 spin_unlock_irqrestore(&qp->s_lock, tflags); 343 ud_loopback(qp, wqe); 344 spin_lock_irqsave(&qp->s_lock, tflags); 345 ps->flags = tflags; 346 hfi1_send_complete(qp, wqe, IB_WC_SUCCESS); 347 goto done_free_tx; 348 } 349 } 350 351 qp->s_cur = next_cur; 352 extra_bytes = -wqe->length & 3; 353 nwords = (wqe->length + extra_bytes) >> 2; 354 355 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 356 qp->s_hdrwords = 7; 357 ps->s_txreq->s_cur_size = wqe->length; 358 ps->s_txreq->ss = &qp->s_sge; 359 qp->s_srate = ah_attr->static_rate; 360 qp->srate_mbps = ib_rate_to_mbps(qp->s_srate); 361 qp->s_wqe = wqe; 362 qp->s_sge.sge = wqe->sg_list[0]; 363 qp->s_sge.sg_list = wqe->sg_list + 1; 364 qp->s_sge.num_sge = wqe->wr.num_sge; 365 qp->s_sge.total_len = wqe->length; 366 367 if (ah_attr->ah_flags & IB_AH_GRH) { 368 /* Header size in 32-bit words. */ 369 qp->s_hdrwords += hfi1_make_grh(ibp, 370 &ps->s_txreq->phdr.hdr.u.l.grh, 371 &ah_attr->grh, 372 qp->s_hdrwords, nwords); 373 lrh0 = HFI1_LRH_GRH; 374 ohdr = &ps->s_txreq->phdr.hdr.u.l.oth; 375 /* 376 * Don't worry about sending to locally attached multicast 377 * QPs. It is unspecified by the spec. what happens. 378 */ 379 } else { 380 /* Header size in 32-bit words. */ 381 lrh0 = HFI1_LRH_BTH; 382 ohdr = &ps->s_txreq->phdr.hdr.u.oth; 383 } 384 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 385 qp->s_hdrwords++; 386 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 387 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 388 } else { 389 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 390 } 391 sc5 = ibp->sl_to_sc[ah_attr->sl]; 392 lrh0 |= (ah_attr->sl & 0xf) << 4; 393 if (qp->ibqp.qp_type == IB_QPT_SMI) { 394 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 395 priv->s_sc = 0xf; 396 } else { 397 lrh0 |= (sc5 & 0xf) << 12; 398 priv->s_sc = sc5; 399 } 400 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc); 401 ps->s_txreq->sde = priv->s_sde; 402 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc); 403 ps->s_txreq->psc = priv->s_sendcontext; 404 ps->s_txreq->phdr.hdr.lrh[0] = cpu_to_be16(lrh0); 405 ps->s_txreq->phdr.hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); 406 ps->s_txreq->phdr.hdr.lrh[2] = 407 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 408 if (ah_attr->dlid == be16_to_cpu(IB_LID_PERMISSIVE)) { 409 ps->s_txreq->phdr.hdr.lrh[3] = IB_LID_PERMISSIVE; 410 } else { 411 lid = ppd->lid; 412 if (lid) { 413 lid |= ah_attr->src_path_bits & ((1 << ppd->lmc) - 1); 414 ps->s_txreq->phdr.hdr.lrh[3] = cpu_to_be16(lid); 415 } else { 416 ps->s_txreq->phdr.hdr.lrh[3] = IB_LID_PERMISSIVE; 417 } 418 } 419 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 420 bth0 |= IB_BTH_SOLICITED; 421 bth0 |= extra_bytes << 20; 422 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) 423 bth0 |= hfi1_get_pkey(ibp, wqe->ud_wr.pkey_index); 424 else 425 bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index); 426 ohdr->bth[0] = cpu_to_be32(bth0); 427 ohdr->bth[1] = cpu_to_be32(wqe->ud_wr.remote_qpn); 428 ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn)); 429 /* 430 * Qkeys with the high order bit set mean use the 431 * qkey from the QP context instead of the WR (see 10.2.5). 432 */ 433 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ? 434 qp->qkey : wqe->ud_wr.remote_qkey); 435 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 436 /* disarm any ahg */ 437 priv->s_ahg->ahgcount = 0; 438 priv->s_ahg->ahgidx = 0; 439 priv->s_ahg->tx_flags = 0; 440 /* pbc */ 441 ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; 442 443 return 1; 444 445 done_free_tx: 446 hfi1_put_txreq(ps->s_txreq); 447 ps->s_txreq = NULL; 448 return 1; 449 450 bail: 451 hfi1_put_txreq(ps->s_txreq); 452 453 bail_no_tx: 454 ps->s_txreq = NULL; 455 qp->s_flags &= ~RVT_S_BUSY; 456 qp->s_hdrwords = 0; 457 return 0; 458 } 459 460 /* 461 * Hardware can't check this so we do it here. 462 * 463 * This is a slightly different algorithm than the standard pkey check. It 464 * special cases the management keys and allows for 0x7fff and 0xffff to be in 465 * the table at the same time. 466 * 467 * @returns the index found or -1 if not found 468 */ 469 int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey) 470 { 471 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 472 unsigned i; 473 474 if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) { 475 unsigned lim_idx = -1; 476 477 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) { 478 /* here we look for an exact match */ 479 if (ppd->pkeys[i] == pkey) 480 return i; 481 if (ppd->pkeys[i] == LIM_MGMT_P_KEY) 482 lim_idx = i; 483 } 484 485 /* did not find 0xffff return 0x7fff idx if found */ 486 if (pkey == FULL_MGMT_P_KEY) 487 return lim_idx; 488 489 /* no match... */ 490 return -1; 491 } 492 493 pkey &= 0x7fff; /* remove limited/full membership bit */ 494 495 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) 496 if ((ppd->pkeys[i] & 0x7fff) == pkey) 497 return i; 498 499 /* 500 * Should not get here, this means hardware failed to validate pkeys. 501 */ 502 return -1; 503 } 504 505 void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn, 506 u32 pkey, u32 slid, u32 dlid, u8 sc5, 507 const struct ib_grh *old_grh) 508 { 509 u64 pbc, pbc_flags = 0; 510 u32 bth0, plen, vl, hwords = 5; 511 u16 lrh0; 512 u8 sl = ibp->sc_to_sl[sc5]; 513 struct ib_header hdr; 514 struct ib_other_headers *ohdr; 515 struct pio_buf *pbuf; 516 struct send_context *ctxt = qp_to_send_context(qp, sc5); 517 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 518 519 if (old_grh) { 520 struct ib_grh *grh = &hdr.u.l.grh; 521 522 grh->version_tclass_flow = old_grh->version_tclass_flow; 523 grh->paylen = cpu_to_be16((hwords - 2 + SIZE_OF_CRC) << 2); 524 grh->hop_limit = 0xff; 525 grh->sgid = old_grh->dgid; 526 grh->dgid = old_grh->sgid; 527 ohdr = &hdr.u.l.oth; 528 lrh0 = HFI1_LRH_GRH; 529 hwords += sizeof(struct ib_grh) / sizeof(u32); 530 } else { 531 ohdr = &hdr.u.oth; 532 lrh0 = HFI1_LRH_BTH; 533 } 534 535 lrh0 |= (sc5 & 0xf) << 12 | sl << 4; 536 537 bth0 = pkey | (IB_OPCODE_CNP << 24); 538 ohdr->bth[0] = cpu_to_be32(bth0); 539 540 ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << HFI1_BECN_SHIFT)); 541 ohdr->bth[2] = 0; /* PSN 0 */ 542 543 hdr.lrh[0] = cpu_to_be16(lrh0); 544 hdr.lrh[1] = cpu_to_be16(dlid); 545 hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); 546 hdr.lrh[3] = cpu_to_be16(slid); 547 548 plen = 2 /* PBC */ + hwords; 549 pbc_flags |= (!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT; 550 vl = sc_to_vlt(ppd->dd, sc5); 551 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); 552 if (ctxt) { 553 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL); 554 if (pbuf) 555 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, 556 &hdr, hwords); 557 } 558 } 559 560 /* 561 * opa_smp_check() - Do the regular pkey checking, and the additional 562 * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section 563 * 9.10.25 ("SMA Packet Checks"). 564 * 565 * Note that: 566 * - Checks are done using the pkey directly from the packet's BTH, 567 * and specifically _not_ the pkey that we attach to the completion, 568 * which may be different. 569 * - These checks are specifically for "non-local" SMPs (i.e., SMPs 570 * which originated on another node). SMPs which are sent from, and 571 * destined to this node are checked in opa_local_smp_check(). 572 * 573 * At the point where opa_smp_check() is called, we know: 574 * - destination QP is QP0 575 * 576 * opa_smp_check() returns 0 if all checks succeed, 1 otherwise. 577 */ 578 static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5, 579 struct rvt_qp *qp, u16 slid, struct opa_smp *smp) 580 { 581 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 582 583 /* 584 * I don't think it's possible for us to get here with sc != 0xf, 585 * but check it to be certain. 586 */ 587 if (sc5 != 0xf) 588 return 1; 589 590 if (rcv_pkey_check(ppd, pkey, sc5, slid)) 591 return 1; 592 593 /* 594 * At this point we know (and so don't need to check again) that 595 * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY 596 * (see ingress_pkey_check). 597 */ 598 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE && 599 smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) { 600 ingress_pkey_table_fail(ppd, pkey, slid); 601 return 1; 602 } 603 604 /* 605 * SMPs fall into one of four (disjoint) categories: 606 * SMA request, SMA response, SMA trap, or SMA trap repress. 607 * Our response depends, in part, on which type of SMP we're 608 * processing. 609 * 610 * If this is an SMA response, skip the check here. 611 * 612 * If this is an SMA request or SMA trap repress: 613 * - pkey != FULL_MGMT_P_KEY => 614 * increment port recv constraint errors, drop MAD 615 * 616 * Otherwise: 617 * - accept if the port is running an SM 618 * - drop MAD if it's an SMA trap 619 * - pkey == FULL_MGMT_P_KEY => 620 * reply with unsupported method 621 * - pkey != FULL_MGMT_P_KEY => 622 * increment port recv constraint errors, drop MAD 623 */ 624 switch (smp->method) { 625 case IB_MGMT_METHOD_GET_RESP: 626 case IB_MGMT_METHOD_REPORT_RESP: 627 break; 628 case IB_MGMT_METHOD_GET: 629 case IB_MGMT_METHOD_SET: 630 case IB_MGMT_METHOD_REPORT: 631 case IB_MGMT_METHOD_TRAP_REPRESS: 632 if (pkey != FULL_MGMT_P_KEY) { 633 ingress_pkey_table_fail(ppd, pkey, slid); 634 return 1; 635 } 636 break; 637 default: 638 if (ibp->rvp.port_cap_flags & IB_PORT_SM) 639 return 0; 640 if (smp->method == IB_MGMT_METHOD_TRAP) 641 return 1; 642 if (pkey == FULL_MGMT_P_KEY) { 643 smp->status |= IB_SMP_UNSUP_METHOD; 644 return 0; 645 } 646 ingress_pkey_table_fail(ppd, pkey, slid); 647 return 1; 648 } 649 return 0; 650 } 651 652 /** 653 * hfi1_ud_rcv - receive an incoming UD packet 654 * @ibp: the port the packet came in on 655 * @hdr: the packet header 656 * @rcv_flags: flags relevant to rcv processing 657 * @data: the packet data 658 * @tlen: the packet length 659 * @qp: the QP the packet came on 660 * 661 * This is called from qp_rcv() to process an incoming UD packet 662 * for the given QP. 663 * Called at interrupt level. 664 */ 665 void hfi1_ud_rcv(struct hfi1_packet *packet) 666 { 667 struct ib_other_headers *ohdr = packet->ohdr; 668 int opcode; 669 u32 hdrsize = packet->hlen; 670 struct ib_wc wc; 671 u32 qkey; 672 u32 src_qp; 673 u16 dlid, pkey; 674 int mgmt_pkey_idx = -1; 675 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); 676 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 677 struct ib_header *hdr = packet->hdr; 678 u32 rcv_flags = packet->rcv_flags; 679 void *data = packet->ebuf; 680 u32 tlen = packet->tlen; 681 struct rvt_qp *qp = packet->qp; 682 bool has_grh = rcv_flags & HFI1_HAS_GRH; 683 u8 sc5 = hdr2sc(hdr, packet->rhf); 684 u32 bth1; 685 u8 sl_from_sc, sl; 686 u16 slid; 687 u8 extra_bytes; 688 689 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 690 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; 691 dlid = be16_to_cpu(hdr->lrh[1]); 692 bth1 = be32_to_cpu(ohdr->bth[1]); 693 slid = be16_to_cpu(hdr->lrh[3]); 694 pkey = (u16)be32_to_cpu(ohdr->bth[0]); 695 sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xf; 696 extra_bytes = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 697 extra_bytes += (SIZE_OF_CRC << 2); 698 sl_from_sc = ibp->sc_to_sl[sc5]; 699 700 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 701 opcode &= 0xff; 702 703 process_ecn(qp, packet, (opcode != IB_OPCODE_CNP)); 704 /* 705 * Get the number of bytes the message was padded by 706 * and drop incomplete packets. 707 */ 708 if (unlikely(tlen < (hdrsize + extra_bytes))) 709 goto drop; 710 711 tlen -= hdrsize + extra_bytes; 712 713 /* 714 * Check that the permissive LID is only used on QP0 715 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 716 */ 717 if (qp->ibqp.qp_num) { 718 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 719 hdr->lrh[3] == IB_LID_PERMISSIVE)) 720 goto drop; 721 if (qp->ibqp.qp_num > 1) { 722 if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) { 723 /* 724 * Traps will not be sent for packets dropped 725 * by the HW. This is fine, as sending trap 726 * for invalid pkeys is optional according to 727 * IB spec (release 1.3, section 10.9.4) 728 */ 729 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_P_KEY, 730 pkey, sl, 731 src_qp, qp->ibqp.qp_num, 732 slid, dlid); 733 return; 734 } 735 } else { 736 /* GSI packet */ 737 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey); 738 if (mgmt_pkey_idx < 0) 739 goto drop; 740 } 741 if (unlikely(qkey != qp->qkey)) { 742 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_Q_KEY, qkey, sl, 743 src_qp, qp->ibqp.qp_num, 744 slid, dlid); 745 return; 746 } 747 /* Drop invalid MAD packets (see 13.5.3.1). */ 748 if (unlikely(qp->ibqp.qp_num == 1 && 749 (tlen > 2048 || (sc5 == 0xF)))) 750 goto drop; 751 } else { 752 /* Received on QP0, and so by definition, this is an SMP */ 753 struct opa_smp *smp = (struct opa_smp *)data; 754 755 if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp)) 756 goto drop; 757 758 if (tlen > 2048) 759 goto drop; 760 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 761 hdr->lrh[3] == IB_LID_PERMISSIVE) && 762 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 763 goto drop; 764 765 /* look up SMI pkey */ 766 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey); 767 if (mgmt_pkey_idx < 0) 768 goto drop; 769 } 770 771 if (qp->ibqp.qp_num > 1 && 772 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 773 wc.ex.imm_data = ohdr->u.ud.imm_data; 774 wc.wc_flags = IB_WC_WITH_IMM; 775 tlen -= sizeof(u32); 776 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 777 wc.ex.imm_data = 0; 778 wc.wc_flags = 0; 779 } else { 780 goto drop; 781 } 782 783 /* 784 * A GRH is expected to precede the data even if not 785 * present on the wire. 786 */ 787 wc.byte_len = tlen + sizeof(struct ib_grh); 788 789 /* 790 * Get the next work request entry to find where to put the data. 791 */ 792 if (qp->r_flags & RVT_R_REUSE_SGE) { 793 qp->r_flags &= ~RVT_R_REUSE_SGE; 794 } else { 795 int ret; 796 797 ret = hfi1_rvt_get_rwqe(qp, 0); 798 if (ret < 0) { 799 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 800 return; 801 } 802 if (!ret) { 803 if (qp->ibqp.qp_num == 0) 804 ibp->rvp.n_vl15_dropped++; 805 return; 806 } 807 } 808 /* Silently drop packets which are too big. */ 809 if (unlikely(wc.byte_len > qp->r_len)) { 810 qp->r_flags |= RVT_R_REUSE_SGE; 811 goto drop; 812 } 813 if (has_grh) { 814 hfi1_copy_sge(&qp->r_sge, &hdr->u.l.grh, 815 sizeof(struct ib_grh), true, false); 816 wc.wc_flags |= IB_WC_GRH; 817 } else { 818 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 819 } 820 hfi1_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 821 true, false); 822 rvt_put_ss(&qp->r_sge); 823 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 824 return; 825 wc.wr_id = qp->r_wr_id; 826 wc.status = IB_WC_SUCCESS; 827 wc.opcode = IB_WC_RECV; 828 wc.vendor_err = 0; 829 wc.qp = &qp->ibqp; 830 wc.src_qp = src_qp; 831 832 if (qp->ibqp.qp_type == IB_QPT_GSI || 833 qp->ibqp.qp_type == IB_QPT_SMI) { 834 if (mgmt_pkey_idx < 0) { 835 if (net_ratelimit()) { 836 struct hfi1_devdata *dd = ppd->dd; 837 838 dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n", 839 qp->ibqp.qp_type); 840 mgmt_pkey_idx = 0; 841 } 842 } 843 wc.pkey_index = (unsigned)mgmt_pkey_idx; 844 } else { 845 wc.pkey_index = 0; 846 } 847 848 wc.slid = slid; 849 wc.sl = sl_from_sc; 850 851 /* 852 * Save the LMC lower bits if the destination LID is a unicast LID. 853 */ 854 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 : 855 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); 856 wc.port_num = qp->port_num; 857 /* Signal completion event if the solicited bit is set. */ 858 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 859 (ohdr->bth[0] & 860 cpu_to_be32(IB_BTH_SOLICITED)) != 0); 861 return; 862 863 drop: 864 ibp->rvp.n_pkt_drops++; 865 } 866