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1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB2/*3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.5 */6 7#include <linux/skbuff.h>8#include <crypto/hash.h>9 10#include "rxe.h"11#include "rxe_loc.h"12#include "rxe_queue.h"13 14static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,15 u32 opcode);16 17static inline void retry_first_write_send(struct rxe_qp *qp,18 struct rxe_send_wqe *wqe, int npsn)19{20 int i;21 22 for (i = 0; i < npsn; i++) {23 int to_send = (wqe->dma.resid > qp->mtu) ?24 qp->mtu : wqe->dma.resid;25 26 qp->req.opcode = next_opcode(qp, wqe,27 wqe->wr.opcode);28 29 if (wqe->wr.send_flags & IB_SEND_INLINE) {30 wqe->dma.resid -= to_send;31 wqe->dma.sge_offset += to_send;32 } else {33 advance_dma_data(&wqe->dma, to_send);34 }35 }36}37 38static void req_retry(struct rxe_qp *qp)39{40 struct rxe_send_wqe *wqe;41 unsigned int wqe_index;42 unsigned int mask;43 int npsn;44 int first = 1;45 struct rxe_queue *q = qp->sq.queue;46 unsigned int cons;47 unsigned int prod;48 49 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);50 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);51 52 qp->req.wqe_index = cons;53 qp->req.psn = qp->comp.psn;54 qp->req.opcode = -1;55 56 for (wqe_index = cons; wqe_index != prod;57 wqe_index = queue_next_index(q, wqe_index)) {58 wqe = queue_addr_from_index(qp->sq.queue, wqe_index);59 mask = wr_opcode_mask(wqe->wr.opcode, qp);60 61 if (wqe->state == wqe_state_posted)62 break;63 64 if (wqe->state == wqe_state_done)65 continue;66 67 wqe->iova = (mask & WR_ATOMIC_MASK) ?68 wqe->wr.wr.atomic.remote_addr :69 (mask & WR_READ_OR_WRITE_MASK) ?70 wqe->wr.wr.rdma.remote_addr :71 0;72 73 if (!first || (mask & WR_READ_MASK) == 0) {74 wqe->dma.resid = wqe->dma.length;75 wqe->dma.cur_sge = 0;76 wqe->dma.sge_offset = 0;77 }78 79 if (first) {80 first = 0;81 82 if (mask & WR_WRITE_OR_SEND_MASK) {83 npsn = (qp->comp.psn - wqe->first_psn) &84 BTH_PSN_MASK;85 retry_first_write_send(qp, wqe, npsn);86 }87 88 if (mask & WR_READ_MASK) {89 npsn = (wqe->dma.length - wqe->dma.resid) /90 qp->mtu;91 wqe->iova += npsn * qp->mtu;92 }93 }94 95 wqe->state = wqe_state_posted;96 }97}98 99void rnr_nak_timer(struct timer_list *t)100{101 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer);102 unsigned long flags;103 104 rxe_dbg_qp(qp, "nak timer fired\n");105 106 spin_lock_irqsave(&qp->state_lock, flags);107 if (qp->valid) {108 /* request a send queue retry */109 qp->req.need_retry = 1;110 qp->req.wait_for_rnr_timer = 0;111 rxe_sched_task(&qp->send_task);112 }113 spin_unlock_irqrestore(&qp->state_lock, flags);114}115 116static void req_check_sq_drain_done(struct rxe_qp *qp)117{118 struct rxe_queue *q;119 unsigned int index;120 unsigned int cons;121 struct rxe_send_wqe *wqe;122 unsigned long flags;123 124 spin_lock_irqsave(&qp->state_lock, flags);125 if (qp_state(qp) == IB_QPS_SQD) {126 q = qp->sq.queue;127 index = qp->req.wqe_index;128 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);129 wqe = queue_addr_from_index(q, cons);130 131 /* check to see if we are drained;132 * state_lock used by requester and completer133 */134 do {135 if (!qp->attr.sq_draining)136 /* comp just finished */137 break;138 139 if (wqe && ((index != cons) ||140 (wqe->state != wqe_state_posted)))141 /* comp not done yet */142 break;143 144 qp->attr.sq_draining = 0;145 spin_unlock_irqrestore(&qp->state_lock, flags);146 147 if (qp->ibqp.event_handler) {148 struct ib_event ev;149 150 ev.device = qp->ibqp.device;151 ev.element.qp = &qp->ibqp;152 ev.event = IB_EVENT_SQ_DRAINED;153 qp->ibqp.event_handler(&ev,154 qp->ibqp.qp_context);155 }156 return;157 } while (0);158 }159 spin_unlock_irqrestore(&qp->state_lock, flags);160}161 162static struct rxe_send_wqe *__req_next_wqe(struct rxe_qp *qp)163{164 struct rxe_queue *q = qp->sq.queue;165 unsigned int index = qp->req.wqe_index;166 unsigned int prod;167 168 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);169 if (index == prod)170 return NULL;171 else172 return queue_addr_from_index(q, index);173}174 175static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)176{177 struct rxe_send_wqe *wqe;178 unsigned long flags;179 180 req_check_sq_drain_done(qp);181 182 wqe = __req_next_wqe(qp);183 if (wqe == NULL)184 return NULL;185 186 spin_lock_irqsave(&qp->state_lock, flags);187 if (unlikely((qp_state(qp) == IB_QPS_SQD) &&188 (wqe->state != wqe_state_processing))) {189 spin_unlock_irqrestore(&qp->state_lock, flags);190 return NULL;191 }192 spin_unlock_irqrestore(&qp->state_lock, flags);193 194 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);195 return wqe;196}197 198/**199 * rxe_wqe_is_fenced - check if next wqe is fenced200 * @qp: the queue pair201 * @wqe: the next wqe202 *203 * Returns: 1 if wqe needs to wait204 * 0 if wqe is ready to go205 */206static int rxe_wqe_is_fenced(struct rxe_qp *qp, struct rxe_send_wqe *wqe)207{208 /* Local invalidate fence (LIF) see IBA 10.6.5.1209 * Requires ALL previous operations on the send queue210 * are complete. Make mandatory for the rxe driver.211 */212 if (wqe->wr.opcode == IB_WR_LOCAL_INV)213 return qp->req.wqe_index != queue_get_consumer(qp->sq.queue,214 QUEUE_TYPE_FROM_CLIENT);215 216 /* Fence see IBA 10.8.3.3217 * Requires that all previous read and atomic operations218 * are complete.219 */220 return (wqe->wr.send_flags & IB_SEND_FENCE) &&221 atomic_read(&qp->req.rd_atomic) != qp->attr.max_rd_atomic;222}223 224static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits)225{226 switch (opcode) {227 case IB_WR_RDMA_WRITE:228 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||229 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)230 return fits ?231 IB_OPCODE_RC_RDMA_WRITE_LAST :232 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;233 else234 return fits ?235 IB_OPCODE_RC_RDMA_WRITE_ONLY :236 IB_OPCODE_RC_RDMA_WRITE_FIRST;237 238 case IB_WR_RDMA_WRITE_WITH_IMM:239 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||240 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)241 return fits ?242 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :243 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;244 else245 return fits ?246 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :247 IB_OPCODE_RC_RDMA_WRITE_FIRST;248 249 case IB_WR_SEND:250 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||251 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)252 return fits ?253 IB_OPCODE_RC_SEND_LAST :254 IB_OPCODE_RC_SEND_MIDDLE;255 else256 return fits ?257 IB_OPCODE_RC_SEND_ONLY :258 IB_OPCODE_RC_SEND_FIRST;259 260 case IB_WR_SEND_WITH_IMM:261 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||262 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)263 return fits ?264 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :265 IB_OPCODE_RC_SEND_MIDDLE;266 else267 return fits ?268 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :269 IB_OPCODE_RC_SEND_FIRST;270 271 case IB_WR_FLUSH:272 return IB_OPCODE_RC_FLUSH;273 274 case IB_WR_RDMA_READ:275 return IB_OPCODE_RC_RDMA_READ_REQUEST;276 277 case IB_WR_ATOMIC_CMP_AND_SWP:278 return IB_OPCODE_RC_COMPARE_SWAP;279 280 case IB_WR_ATOMIC_FETCH_AND_ADD:281 return IB_OPCODE_RC_FETCH_ADD;282 283 case IB_WR_SEND_WITH_INV:284 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||285 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)286 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :287 IB_OPCODE_RC_SEND_MIDDLE;288 else289 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :290 IB_OPCODE_RC_SEND_FIRST;291 292 case IB_WR_ATOMIC_WRITE:293 return IB_OPCODE_RC_ATOMIC_WRITE;294 295 case IB_WR_REG_MR:296 case IB_WR_LOCAL_INV:297 return opcode;298 }299 300 return -EINVAL;301}302 303static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits)304{305 switch (opcode) {306 case IB_WR_RDMA_WRITE:307 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||308 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)309 return fits ?310 IB_OPCODE_UC_RDMA_WRITE_LAST :311 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;312 else313 return fits ?314 IB_OPCODE_UC_RDMA_WRITE_ONLY :315 IB_OPCODE_UC_RDMA_WRITE_FIRST;316 317 case IB_WR_RDMA_WRITE_WITH_IMM:318 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||319 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)320 return fits ?321 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :322 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;323 else324 return fits ?325 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :326 IB_OPCODE_UC_RDMA_WRITE_FIRST;327 328 case IB_WR_SEND:329 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||330 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)331 return fits ?332 IB_OPCODE_UC_SEND_LAST :333 IB_OPCODE_UC_SEND_MIDDLE;334 else335 return fits ?336 IB_OPCODE_UC_SEND_ONLY :337 IB_OPCODE_UC_SEND_FIRST;338 339 case IB_WR_SEND_WITH_IMM:340 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||341 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)342 return fits ?343 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :344 IB_OPCODE_UC_SEND_MIDDLE;345 else346 return fits ?347 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :348 IB_OPCODE_UC_SEND_FIRST;349 }350 351 return -EINVAL;352}353 354static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,355 u32 opcode)356{357 int fits = (wqe->dma.resid <= qp->mtu);358 359 switch (qp_type(qp)) {360 case IB_QPT_RC:361 return next_opcode_rc(qp, opcode, fits);362 363 case IB_QPT_UC:364 return next_opcode_uc(qp, opcode, fits);365 366 case IB_QPT_UD:367 case IB_QPT_GSI:368 switch (opcode) {369 case IB_WR_SEND:370 return IB_OPCODE_UD_SEND_ONLY;371 372 case IB_WR_SEND_WITH_IMM:373 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;374 }375 break;376 377 default:378 break;379 }380 381 return -EINVAL;382}383 384static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)385{386 int depth;387 388 if (wqe->has_rd_atomic)389 return 0;390 391 qp->req.need_rd_atomic = 1;392 depth = atomic_dec_return(&qp->req.rd_atomic);393 394 if (depth >= 0) {395 qp->req.need_rd_atomic = 0;396 wqe->has_rd_atomic = 1;397 return 0;398 }399 400 atomic_inc(&qp->req.rd_atomic);401 return -EAGAIN;402}403 404static inline int get_mtu(struct rxe_qp *qp)405{406 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);407 408 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))409 return qp->mtu;410 411 return rxe->port.mtu_cap;412}413 414static struct sk_buff *init_req_packet(struct rxe_qp *qp,415 struct rxe_av *av,416 struct rxe_send_wqe *wqe,417 int opcode, u32 payload,418 struct rxe_pkt_info *pkt)419{420 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);421 struct sk_buff *skb;422 struct rxe_send_wr *ibwr = &wqe->wr;423 int pad = (-payload) & 0x3;424 int paylen;425 int solicited;426 u32 qp_num;427 int ack_req = 0;428 429 /* length from start of bth to end of icrc */430 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;431 pkt->paylen = paylen;432 433 /* init skb */434 skb = rxe_init_packet(rxe, av, paylen, pkt);435 if (unlikely(!skb))436 return NULL;437 438 /* init bth */439 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&440 (pkt->mask & RXE_END_MASK) &&441 ((pkt->mask & (RXE_SEND_MASK)) ||442 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==443 (RXE_WRITE_MASK | RXE_IMMDT_MASK));444 445 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :446 qp->attr.dest_qp_num;447 448 if (qp_type(qp) != IB_QPT_UD && qp_type(qp) != IB_QPT_UC)449 ack_req = ((pkt->mask & RXE_END_MASK) ||450 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));451 if (ack_req)452 qp->req.noack_pkts = 0;453 454 bth_init(pkt, pkt->opcode, solicited, 0, pad, IB_DEFAULT_PKEY_FULL, qp_num,455 ack_req, pkt->psn);456 457 /* init optional headers */458 if (pkt->mask & RXE_RETH_MASK) {459 if (pkt->mask & RXE_FETH_MASK)460 reth_set_rkey(pkt, ibwr->wr.flush.rkey);461 else462 reth_set_rkey(pkt, ibwr->wr.rdma.rkey);463 reth_set_va(pkt, wqe->iova);464 reth_set_len(pkt, wqe->dma.resid);465 }466 467 /* Fill Flush Extension Transport Header */468 if (pkt->mask & RXE_FETH_MASK)469 feth_init(pkt, ibwr->wr.flush.type, ibwr->wr.flush.level);470 471 if (pkt->mask & RXE_IMMDT_MASK)472 immdt_set_imm(pkt, ibwr->ex.imm_data);473 474 if (pkt->mask & RXE_IETH_MASK)475 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);476 477 if (pkt->mask & RXE_ATMETH_MASK) {478 atmeth_set_va(pkt, wqe->iova);479 if (opcode == IB_OPCODE_RC_COMPARE_SWAP) {480 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);481 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);482 } else {483 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);484 }485 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);486 }487 488 if (pkt->mask & RXE_DETH_MASK) {489 if (qp->ibqp.qp_num == 1)490 deth_set_qkey(pkt, GSI_QKEY);491 else492 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);493 deth_set_sqp(pkt, qp->ibqp.qp_num);494 }495 496 return skb;497}498 499static int finish_packet(struct rxe_qp *qp, struct rxe_av *av,500 struct rxe_send_wqe *wqe, struct rxe_pkt_info *pkt,501 struct sk_buff *skb, u32 payload)502{503 int err;504 505 err = rxe_prepare(av, pkt, skb);506 if (err)507 return err;508 509 if (pkt->mask & RXE_WRITE_OR_SEND_MASK) {510 if (wqe->wr.send_flags & IB_SEND_INLINE) {511 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];512 513 memcpy(payload_addr(pkt), tmp, payload);514 515 wqe->dma.resid -= payload;516 wqe->dma.sge_offset += payload;517 } else {518 err = copy_data(qp->pd, 0, &wqe->dma,519 payload_addr(pkt), payload,520 RXE_FROM_MR_OBJ);521 if (err)522 return err;523 }524 if (bth_pad(pkt)) {525 u8 *pad = payload_addr(pkt) + payload;526 527 memset(pad, 0, bth_pad(pkt));528 }529 } else if (pkt->mask & RXE_FLUSH_MASK) {530 /* oA19-2: shall have no payload. */531 wqe->dma.resid = 0;532 }533 534 if (pkt->mask & RXE_ATOMIC_WRITE_MASK) {535 memcpy(payload_addr(pkt), wqe->dma.atomic_wr, payload);536 wqe->dma.resid -= payload;537 }538 539 return 0;540}541 542static void update_wqe_state(struct rxe_qp *qp,543 struct rxe_send_wqe *wqe,544 struct rxe_pkt_info *pkt)545{546 if (pkt->mask & RXE_END_MASK) {547 if (qp_type(qp) == IB_QPT_RC)548 wqe->state = wqe_state_pending;549 else550 wqe->state = wqe_state_done;551 } else {552 wqe->state = wqe_state_processing;553 }554}555 556static void update_wqe_psn(struct rxe_qp *qp,557 struct rxe_send_wqe *wqe,558 struct rxe_pkt_info *pkt,559 u32 payload)560{561 /* number of packets left to send including current one */562 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;563 564 /* handle zero length packet case */565 if (num_pkt == 0)566 num_pkt = 1;567 568 if (pkt->mask & RXE_START_MASK) {569 wqe->first_psn = qp->req.psn;570 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;571 }572 573 if (pkt->mask & RXE_READ_MASK)574 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;575 else576 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;577}578 579static void update_state(struct rxe_qp *qp, struct rxe_pkt_info *pkt)580{581 qp->req.opcode = pkt->opcode;582 583 if (pkt->mask & RXE_END_MASK)584 qp->req.wqe_index = queue_next_index(qp->sq.queue,585 qp->req.wqe_index);586 587 qp->need_req_skb = 0;588 589 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))590 mod_timer(&qp->retrans_timer,591 jiffies + qp->qp_timeout_jiffies);592}593 594static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)595{596 u8 opcode = wqe->wr.opcode;597 u32 rkey;598 int ret;599 600 switch (opcode) {601 case IB_WR_LOCAL_INV:602 rkey = wqe->wr.ex.invalidate_rkey;603 if (rkey_is_mw(rkey))604 ret = rxe_invalidate_mw(qp, rkey);605 else606 ret = rxe_invalidate_mr(qp, rkey);607 608 if (unlikely(ret)) {609 wqe->status = IB_WC_LOC_QP_OP_ERR;610 return ret;611 }612 break;613 case IB_WR_REG_MR:614 ret = rxe_reg_fast_mr(qp, wqe);615 if (unlikely(ret)) {616 wqe->status = IB_WC_LOC_QP_OP_ERR;617 return ret;618 }619 break;620 case IB_WR_BIND_MW:621 ret = rxe_bind_mw(qp, wqe);622 if (unlikely(ret)) {623 wqe->status = IB_WC_MW_BIND_ERR;624 return ret;625 }626 break;627 default:628 rxe_dbg_qp(qp, "Unexpected send wqe opcode %d\n", opcode);629 wqe->status = IB_WC_LOC_QP_OP_ERR;630 return -EINVAL;631 }632 633 wqe->state = wqe_state_done;634 wqe->status = IB_WC_SUCCESS;635 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);636 637 return 0;638}639 640int rxe_requester(struct rxe_qp *qp)641{642 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);643 struct rxe_pkt_info pkt;644 struct sk_buff *skb;645 struct rxe_send_wqe *wqe;646 enum rxe_hdr_mask mask;647 u32 payload;648 int mtu;649 int opcode;650 int err;651 int ret;652 struct rxe_queue *q = qp->sq.queue;653 struct rxe_ah *ah;654 struct rxe_av *av;655 unsigned long flags;656 657 spin_lock_irqsave(&qp->state_lock, flags);658 if (unlikely(!qp->valid)) {659 spin_unlock_irqrestore(&qp->state_lock, flags);660 goto exit;661 }662 663 if (unlikely(qp_state(qp) == IB_QPS_ERR)) {664 wqe = __req_next_wqe(qp);665 spin_unlock_irqrestore(&qp->state_lock, flags);666 if (wqe)667 goto err;668 else669 goto exit;670 }671 672 if (unlikely(qp_state(qp) == IB_QPS_RESET)) {673 qp->req.wqe_index = queue_get_consumer(q,674 QUEUE_TYPE_FROM_CLIENT);675 qp->req.opcode = -1;676 qp->req.need_rd_atomic = 0;677 qp->req.wait_psn = 0;678 qp->req.need_retry = 0;679 qp->req.wait_for_rnr_timer = 0;680 spin_unlock_irqrestore(&qp->state_lock, flags);681 goto exit;682 }683 spin_unlock_irqrestore(&qp->state_lock, flags);684 685 /* we come here if the retransmit timer has fired686 * or if the rnr timer has fired. If the retransmit687 * timer fires while we are processing an RNR NAK wait688 * until the rnr timer has fired before starting the689 * retry flow690 */691 if (unlikely(qp->req.need_retry && !qp->req.wait_for_rnr_timer)) {692 req_retry(qp);693 qp->req.need_retry = 0;694 }695 696 wqe = req_next_wqe(qp);697 if (unlikely(!wqe))698 goto exit;699 700 if (rxe_wqe_is_fenced(qp, wqe)) {701 qp->req.wait_fence = 1;702 goto exit;703 }704 705 if (wqe->mask & WR_LOCAL_OP_MASK) {706 err = rxe_do_local_ops(qp, wqe);707 if (unlikely(err))708 goto err;709 else710 goto done;711 }712 713 if (unlikely(qp_type(qp) == IB_QPT_RC &&714 psn_compare(qp->req.psn, (qp->comp.psn +715 RXE_MAX_UNACKED_PSNS)) > 0)) {716 qp->req.wait_psn = 1;717 goto exit;718 }719 720 /* Limit the number of inflight SKBs per QP */721 if (unlikely(atomic_read(&qp->skb_out) >722 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {723 qp->need_req_skb = 1;724 goto exit;725 }726 727 opcode = next_opcode(qp, wqe, wqe->wr.opcode);728 if (unlikely(opcode < 0)) {729 wqe->status = IB_WC_LOC_QP_OP_ERR;730 goto err;731 }732 733 mask = rxe_opcode[opcode].mask;734 if (unlikely(mask & (RXE_READ_OR_ATOMIC_MASK |735 RXE_ATOMIC_WRITE_MASK))) {736 if (check_init_depth(qp, wqe))737 goto exit;738 }739 740 mtu = get_mtu(qp);741 payload = (mask & (RXE_WRITE_OR_SEND_MASK | RXE_ATOMIC_WRITE_MASK)) ?742 wqe->dma.resid : 0;743 if (payload > mtu) {744 if (qp_type(qp) == IB_QPT_UD) {745 /* C10-93.1.1: If the total sum of all the buffer lengths specified for a746 * UD message exceeds the MTU of the port as returned by QueryHCA, the CI747 * shall not emit any packets for this message. Further, the CI shall not748 * generate an error due to this condition.749 */750 751 /* fake a successful UD send */752 wqe->first_psn = qp->req.psn;753 wqe->last_psn = qp->req.psn;754 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;755 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;756 qp->req.wqe_index = queue_next_index(qp->sq.queue,757 qp->req.wqe_index);758 wqe->state = wqe_state_done;759 wqe->status = IB_WC_SUCCESS;760 goto done;761 }762 payload = mtu;763 }764 765 pkt.rxe = rxe;766 pkt.opcode = opcode;767 pkt.qp = qp;768 pkt.psn = qp->req.psn;769 pkt.mask = rxe_opcode[opcode].mask;770 pkt.wqe = wqe;771 772 av = rxe_get_av(&pkt, &ah);773 if (unlikely(!av)) {774 rxe_dbg_qp(qp, "Failed no address vector\n");775 wqe->status = IB_WC_LOC_QP_OP_ERR;776 goto err;777 }778 779 skb = init_req_packet(qp, av, wqe, opcode, payload, &pkt);780 if (unlikely(!skb)) {781 rxe_dbg_qp(qp, "Failed allocating skb\n");782 wqe->status = IB_WC_LOC_QP_OP_ERR;783 if (ah)784 rxe_put(ah);785 goto err;786 }787 788 err = finish_packet(qp, av, wqe, &pkt, skb, payload);789 if (unlikely(err)) {790 rxe_dbg_qp(qp, "Error during finish packet\n");791 if (err == -EFAULT)792 wqe->status = IB_WC_LOC_PROT_ERR;793 else794 wqe->status = IB_WC_LOC_QP_OP_ERR;795 kfree_skb(skb);796 if (ah)797 rxe_put(ah);798 goto err;799 }800 801 if (ah)802 rxe_put(ah);803 804 err = rxe_xmit_packet(qp, &pkt, skb);805 if (err) {806 wqe->status = IB_WC_LOC_QP_OP_ERR;807 goto err;808 }809 810 update_wqe_state(qp, wqe, &pkt);811 update_wqe_psn(qp, wqe, &pkt, payload);812 update_state(qp, &pkt);813 814 /* A non-zero return value will cause rxe_do_task to815 * exit its loop and end the work item. A zero return816 * will continue looping and return to rxe_requester817 */818done:819 ret = 0;820 goto out;821err:822 /* update wqe_index for each wqe completion */823 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);824 wqe->state = wqe_state_error;825 rxe_qp_error(qp);826exit:827 ret = -EAGAIN;828out:829 return ret;830}831 832int rxe_sender(struct rxe_qp *qp)833{834 int req_ret;835 int comp_ret;836 837 /* process the send queue */838 req_ret = rxe_requester(qp);839 840 /* process the response queue */841 comp_ret = rxe_completer(qp);842 843 /* exit the task loop if both requester and completer844 * are ready845 */846 return (req_ret && comp_ret) ? -EAGAIN : 0;847}848