584 lines · c
1/*2 * Copyright (c) 2012 - 2019 Intel Corporation. All rights reserved.3 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.5 *6 * This software is available to you under a choice of one of two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * provided with the distribution.24 *25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34 35#include <rdma/ib_smi.h>36#include <rdma/ib_verbs.h>37 38#include "qib.h"39#include "qib_mad.h"40 41/**42 * qib_ud_loopback - handle send on loopback QPs43 * @sqp: the sending QP44 * @swqe: the send work request45 *46 * This is called from qib_make_ud_req() to forward a WQE addressed47 * to the same HCA.48 * Note that the receive interrupt handler may be calling qib_ud_rcv()49 * while this is being called.50 */51static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)52{53 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);54 struct qib_pportdata *ppd = ppd_from_ibp(ibp);55 struct qib_devdata *dd = ppd->dd;56 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;57 struct rvt_qp *qp;58 struct rdma_ah_attr *ah_attr;59 unsigned long flags;60 struct rvt_sge_state ssge;61 struct rvt_sge *sge;62 struct ib_wc wc;63 u32 length;64 enum ib_qp_type sqptype, dqptype;65 66 rcu_read_lock();67 qp = rvt_lookup_qpn(rdi, &ibp->rvp, rvt_get_swqe_remote_qpn(swqe));68 if (!qp) {69 ibp->rvp.n_pkt_drops++;70 goto drop;71 }72 73 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?74 IB_QPT_UD : sqp->ibqp.qp_type;75 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?76 IB_QPT_UD : qp->ibqp.qp_type;77 78 if (dqptype != sqptype ||79 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {80 ibp->rvp.n_pkt_drops++;81 goto drop;82 }83 84 ah_attr = rvt_get_swqe_ah_attr(swqe);85 ppd = ppd_from_ibp(ibp);86 87 if (qp->ibqp.qp_num > 1) {88 u16 pkey1;89 u16 pkey2;90 u16 lid;91 92 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index);93 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);94 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {95 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &96 ((1 << ppd->lmc) - 1));97 qib_bad_pkey(ibp, pkey1,98 rdma_ah_get_sl(ah_attr),99 sqp->ibqp.qp_num, qp->ibqp.qp_num,100 cpu_to_be16(lid),101 cpu_to_be16(rdma_ah_get_dlid(ah_attr)));102 goto drop;103 }104 }105 106 /*107 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).108 * Qkeys with the high order bit set mean use the109 * qkey from the QP context instead of the WR (see 10.2.5).110 */111 if (qp->ibqp.qp_num) {112 u32 qkey;113 114 qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?115 sqp->qkey : rvt_get_swqe_remote_qkey(swqe);116 if (unlikely(qkey != qp->qkey))117 goto drop;118 }119 120 /*121 * A GRH is expected to precede the data even if not122 * present on the wire.123 */124 length = swqe->length;125 memset(&wc, 0, sizeof(wc));126 wc.byte_len = length + sizeof(struct ib_grh);127 128 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {129 wc.wc_flags = IB_WC_WITH_IMM;130 wc.ex.imm_data = swqe->wr.ex.imm_data;131 }132 133 spin_lock_irqsave(&qp->r_lock, flags);134 135 /*136 * Get the next work request entry to find where to put the data.137 */138 if (qp->r_flags & RVT_R_REUSE_SGE)139 qp->r_flags &= ~RVT_R_REUSE_SGE;140 else {141 int ret;142 143 ret = rvt_get_rwqe(qp, false);144 if (ret < 0) {145 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);146 goto bail_unlock;147 }148 if (!ret) {149 if (qp->ibqp.qp_num == 0)150 ibp->rvp.n_vl15_dropped++;151 goto bail_unlock;152 }153 }154 /* Silently drop packets which are too big. */155 if (unlikely(wc.byte_len > qp->r_len)) {156 qp->r_flags |= RVT_R_REUSE_SGE;157 ibp->rvp.n_pkt_drops++;158 goto bail_unlock;159 }160 161 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {162 struct ib_grh grh;163 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr);164 165 qib_make_grh(ibp, &grh, grd, 0, 0);166 rvt_copy_sge(qp, &qp->r_sge, &grh,167 sizeof(grh), true, false);168 wc.wc_flags |= IB_WC_GRH;169 } else170 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);171 ssge.sg_list = swqe->sg_list + 1;172 ssge.sge = *swqe->sg_list;173 ssge.num_sge = swqe->wr.num_sge;174 sge = &ssge.sge;175 while (length) {176 u32 len = rvt_get_sge_length(sge, length);177 178 rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);179 sge->vaddr += len;180 sge->length -= len;181 sge->sge_length -= len;182 if (sge->sge_length == 0) {183 if (--ssge.num_sge)184 *sge = *ssge.sg_list++;185 } else if (sge->length == 0 && sge->mr->lkey) {186 if (++sge->n >= RVT_SEGSZ) {187 if (++sge->m >= sge->mr->mapsz)188 break;189 sge->n = 0;190 }191 sge->vaddr =192 sge->mr->map[sge->m]->segs[sge->n].vaddr;193 sge->length =194 sge->mr->map[sge->m]->segs[sge->n].length;195 }196 length -= len;197 }198 rvt_put_ss(&qp->r_sge);199 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))200 goto bail_unlock;201 wc.wr_id = qp->r_wr_id;202 wc.status = IB_WC_SUCCESS;203 wc.opcode = IB_WC_RECV;204 wc.qp = &qp->ibqp;205 wc.src_qp = sqp->ibqp.qp_num;206 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?207 rvt_get_swqe_pkey_index(swqe) : 0;208 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &209 ((1 << ppd->lmc) - 1));210 wc.sl = rdma_ah_get_sl(ah_attr);211 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);212 wc.port_num = qp->port_num;213 /* Signal completion event if the solicited bit is set. */214 rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);215 ibp->rvp.n_loop_pkts++;216bail_unlock:217 spin_unlock_irqrestore(&qp->r_lock, flags);218drop:219 rcu_read_unlock();220}221 222/**223 * qib_make_ud_req - construct a UD request packet224 * @qp: the QP225 * @flags: flags to modify and pass back to caller226 *227 * Assumes the s_lock is held.228 *229 * Return 1 if constructed; otherwise, return 0.230 */231int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags)232{233 struct qib_qp_priv *priv = qp->priv;234 struct ib_other_headers *ohdr;235 struct rdma_ah_attr *ah_attr;236 struct qib_pportdata *ppd;237 struct qib_ibport *ibp;238 struct rvt_swqe *wqe;239 u32 nwords;240 u32 extra_bytes;241 u32 bth0;242 u16 lrh0;243 u16 lid;244 int ret = 0;245 int next_cur;246 247 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {248 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))249 goto bail;250 /* We are in the error state, flush the work request. */251 if (qp->s_last == READ_ONCE(qp->s_head))252 goto bail;253 /* If DMAs are in progress, we can't flush immediately. */254 if (atomic_read(&priv->s_dma_busy)) {255 qp->s_flags |= RVT_S_WAIT_DMA;256 goto bail;257 }258 wqe = rvt_get_swqe_ptr(qp, qp->s_last);259 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);260 goto done;261 }262 263 /* see post_one_send() */264 if (qp->s_cur == READ_ONCE(qp->s_head))265 goto bail;266 267 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);268 next_cur = qp->s_cur + 1;269 if (next_cur >= qp->s_size)270 next_cur = 0;271 272 /* Construct the header. */273 ibp = to_iport(qp->ibqp.device, qp->port_num);274 ppd = ppd_from_ibp(ibp);275 ah_attr = rvt_get_swqe_ah_attr(wqe);276 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) {277 if (rdma_ah_get_dlid(ah_attr) !=278 be16_to_cpu(IB_LID_PERMISSIVE))279 this_cpu_inc(ibp->pmastats->n_multicast_xmit);280 else281 this_cpu_inc(ibp->pmastats->n_unicast_xmit);282 } else {283 this_cpu_inc(ibp->pmastats->n_unicast_xmit);284 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);285 if (unlikely(lid == ppd->lid)) {286 unsigned long tflags = *flags;287 /*288 * If DMAs are in progress, we can't generate289 * a completion for the loopback packet since290 * it would be out of order.291 * XXX Instead of waiting, we could queue a292 * zero length descriptor so we get a callback.293 */294 if (atomic_read(&priv->s_dma_busy)) {295 qp->s_flags |= RVT_S_WAIT_DMA;296 goto bail;297 }298 qp->s_cur = next_cur;299 spin_unlock_irqrestore(&qp->s_lock, tflags);300 qib_ud_loopback(qp, wqe);301 spin_lock_irqsave(&qp->s_lock, tflags);302 *flags = tflags;303 rvt_send_complete(qp, wqe, IB_WC_SUCCESS);304 goto done;305 }306 }307 308 qp->s_cur = next_cur;309 extra_bytes = -wqe->length & 3;310 nwords = (wqe->length + extra_bytes) >> 2;311 312 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */313 qp->s_hdrwords = 7;314 qp->s_cur_size = wqe->length;315 qp->s_cur_sge = &qp->s_sge;316 qp->s_srate = rdma_ah_get_static_rate(ah_attr);317 qp->s_wqe = wqe;318 qp->s_sge.sge = wqe->sg_list[0];319 qp->s_sge.sg_list = wqe->sg_list + 1;320 qp->s_sge.num_sge = wqe->wr.num_sge;321 qp->s_sge.total_len = wqe->length;322 323 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {324 /* Header size in 32-bit words. */325 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh,326 rdma_ah_read_grh(ah_attr),327 qp->s_hdrwords, nwords);328 lrh0 = QIB_LRH_GRH;329 ohdr = &priv->s_hdr->u.l.oth;330 /*331 * Don't worry about sending to locally attached multicast332 * QPs. It is unspecified by the spec. what happens.333 */334 } else {335 /* Header size in 32-bit words. */336 lrh0 = QIB_LRH_BTH;337 ohdr = &priv->s_hdr->u.oth;338 }339 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {340 qp->s_hdrwords++;341 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;342 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;343 } else344 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;345 lrh0 |= rdma_ah_get_sl(ah_attr) << 4;346 if (qp->ibqp.qp_type == IB_QPT_SMI)347 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */348 else349 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12;350 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);351 priv->s_hdr->lrh[1] =352 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */353 priv->s_hdr->lrh[2] =354 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);355 lid = ppd->lid;356 if (lid) {357 lid |= rdma_ah_get_path_bits(ah_attr) &358 ((1 << ppd->lmc) - 1);359 priv->s_hdr->lrh[3] = cpu_to_be16(lid);360 } else361 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE;362 if (wqe->wr.send_flags & IB_SEND_SOLICITED)363 bth0 |= IB_BTH_SOLICITED;364 bth0 |= extra_bytes << 20;365 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY :366 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ?367 rvt_get_swqe_pkey_index(wqe) : 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] = rdma_ah_get_dlid(ah_attr) >=373 be16_to_cpu(IB_MULTICAST_LID_BASE) &&374 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ?375 cpu_to_be32(QIB_MULTICAST_QPN) :376 cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));377 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK);378 /*379 * Qkeys with the high order bit set mean use the380 * qkey from the QP context instead of the WR (see 10.2.5).381 */382 ohdr->u.ud.deth[0] =383 cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :384 rvt_get_swqe_remote_qkey(wqe));385 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);386 387done:388 return 1;389bail:390 qp->s_flags &= ~RVT_S_BUSY;391 return ret;392}393 394static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey)395{396 struct qib_pportdata *ppd = ppd_from_ibp(ibp);397 struct qib_devdata *dd = ppd->dd;398 unsigned ctxt = ppd->hw_pidx;399 unsigned i;400 401 pkey &= 0x7fff; /* remove limited/full membership bit */402 403 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i)404 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey)405 return i;406 407 /*408 * Should not get here, this means hardware failed to validate pkeys.409 * Punt and return index 0.410 */411 return 0;412}413 414/**415 * qib_ud_rcv - receive an incoming UD packet416 * @ibp: the port the packet came in on417 * @hdr: the packet header418 * @has_grh: true if the packet has a GRH419 * @data: the packet data420 * @tlen: the packet length421 * @qp: the QP the packet came on422 *423 * This is called from qib_qp_rcv() to process an incoming UD packet424 * for the given QP.425 * Called at interrupt level.426 */427void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr,428 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)429{430 struct ib_other_headers *ohdr;431 int opcode;432 u32 hdrsize;433 u32 pad;434 struct ib_wc wc;435 u32 qkey;436 u32 src_qp;437 u16 dlid;438 439 /* Check for GRH */440 if (!has_grh) {441 ohdr = &hdr->u.oth;442 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */443 } else {444 ohdr = &hdr->u.l.oth;445 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */446 }447 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);448 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;449 450 /*451 * Get the number of bytes the message was padded by452 * and drop incomplete packets.453 */454 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;455 if (unlikely(tlen < (hdrsize + pad + 4)))456 goto drop;457 458 tlen -= hdrsize + pad + 4;459 460 /*461 * Check that the permissive LID is only used on QP0462 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).463 */464 if (qp->ibqp.qp_num) {465 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||466 hdr->lrh[3] == IB_LID_PERMISSIVE))467 goto drop;468 if (qp->ibqp.qp_num > 1) {469 u16 pkey1, pkey2;470 471 pkey1 = be32_to_cpu(ohdr->bth[0]);472 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);473 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {474 qib_bad_pkey(ibp,475 pkey1,476 (be16_to_cpu(hdr->lrh[0]) >> 4) &477 0xF,478 src_qp, qp->ibqp.qp_num,479 hdr->lrh[3], hdr->lrh[1]);480 return;481 }482 }483 if (unlikely(qkey != qp->qkey))484 return;485 486 /* Drop invalid MAD packets (see 13.5.3.1). */487 if (unlikely(qp->ibqp.qp_num == 1 &&488 (tlen != 256 ||489 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))490 goto drop;491 } else {492 struct ib_smp *smp;493 494 /* Drop invalid MAD packets (see 13.5.3.1). */495 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)496 goto drop;497 smp = (struct ib_smp *) data;498 if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||499 hdr->lrh[3] == IB_LID_PERMISSIVE) &&500 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)501 goto drop;502 }503 504 /*505 * The opcode is in the low byte when its in network order506 * (top byte when in host order).507 */508 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;509 if (qp->ibqp.qp_num > 1 &&510 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {511 wc.ex.imm_data = ohdr->u.ud.imm_data;512 wc.wc_flags = IB_WC_WITH_IMM;513 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {514 wc.ex.imm_data = 0;515 wc.wc_flags = 0;516 } else517 goto drop;518 519 /*520 * A GRH is expected to precede the data even if not521 * present on the wire.522 */523 wc.byte_len = tlen + sizeof(struct ib_grh);524 525 /*526 * Get the next work request entry to find where to put the data.527 */528 if (qp->r_flags & RVT_R_REUSE_SGE)529 qp->r_flags &= ~RVT_R_REUSE_SGE;530 else {531 int ret;532 533 ret = rvt_get_rwqe(qp, false);534 if (ret < 0) {535 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);536 return;537 }538 if (!ret) {539 if (qp->ibqp.qp_num == 0)540 ibp->rvp.n_vl15_dropped++;541 return;542 }543 }544 /* Silently drop packets which are too big. */545 if (unlikely(wc.byte_len > qp->r_len)) {546 qp->r_flags |= RVT_R_REUSE_SGE;547 goto drop;548 }549 if (has_grh) {550 rvt_copy_sge(qp, &qp->r_sge, &hdr->u.l.grh,551 sizeof(struct ib_grh), true, false);552 wc.wc_flags |= IB_WC_GRH;553 } else554 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);555 rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),556 true, false);557 rvt_put_ss(&qp->r_sge);558 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))559 return;560 wc.wr_id = qp->r_wr_id;561 wc.status = IB_WC_SUCCESS;562 wc.opcode = IB_WC_RECV;563 wc.vendor_err = 0;564 wc.qp = &qp->ibqp;565 wc.src_qp = src_qp;566 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?567 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0;568 wc.slid = be16_to_cpu(hdr->lrh[3]);569 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;570 dlid = be16_to_cpu(hdr->lrh[1]);571 /*572 * Save the LMC lower bits if the destination LID is a unicast LID.573 */574 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 :575 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);576 wc.port_num = qp->port_num;577 /* Signal completion event if the solicited bit is set. */578 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));579 return;580 581drop:582 ibp->rvp.n_pkt_drops++;583}584