diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_req.c | 765 |
1 files changed, 765 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c new file mode 100644 index 000000000..4008ab2da --- /dev/null +++ b/drivers/infiniband/sw/rxe/rxe_req.c @@ -0,0 +1,765 @@ +/* + * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. + * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/skbuff.h> +#include <crypto/hash.h> + +#include "rxe.h" +#include "rxe_loc.h" +#include "rxe_queue.h" + +static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, + u32 opcode); + +static inline void retry_first_write_send(struct rxe_qp *qp, + struct rxe_send_wqe *wqe, + unsigned int mask, int npsn) +{ + int i; + + for (i = 0; i < npsn; i++) { + int to_send = (wqe->dma.resid > qp->mtu) ? + qp->mtu : wqe->dma.resid; + + qp->req.opcode = next_opcode(qp, wqe, + wqe->wr.opcode); + + if (wqe->wr.send_flags & IB_SEND_INLINE) { + wqe->dma.resid -= to_send; + wqe->dma.sge_offset += to_send; + } else { + advance_dma_data(&wqe->dma, to_send); + } + if (mask & WR_WRITE_MASK) + wqe->iova += qp->mtu; + } +} + +static void req_retry(struct rxe_qp *qp) +{ + struct rxe_send_wqe *wqe; + unsigned int wqe_index; + unsigned int mask; + int npsn; + int first = 1; + + qp->req.wqe_index = consumer_index(qp->sq.queue); + qp->req.psn = qp->comp.psn; + qp->req.opcode = -1; + + for (wqe_index = consumer_index(qp->sq.queue); + wqe_index != producer_index(qp->sq.queue); + wqe_index = next_index(qp->sq.queue, wqe_index)) { + wqe = addr_from_index(qp->sq.queue, wqe_index); + mask = wr_opcode_mask(wqe->wr.opcode, qp); + + if (wqe->state == wqe_state_posted) + break; + + if (wqe->state == wqe_state_done) + continue; + + wqe->iova = (mask & WR_ATOMIC_MASK) ? + wqe->wr.wr.atomic.remote_addr : + (mask & WR_READ_OR_WRITE_MASK) ? + wqe->wr.wr.rdma.remote_addr : + 0; + + if (!first || (mask & WR_READ_MASK) == 0) { + wqe->dma.resid = wqe->dma.length; + wqe->dma.cur_sge = 0; + wqe->dma.sge_offset = 0; + } + + if (first) { + first = 0; + + if (mask & WR_WRITE_OR_SEND_MASK) { + npsn = (qp->comp.psn - wqe->first_psn) & + BTH_PSN_MASK; + retry_first_write_send(qp, wqe, mask, npsn); + } + + if (mask & WR_READ_MASK) { + npsn = (wqe->dma.length - wqe->dma.resid) / + qp->mtu; + wqe->iova += npsn * qp->mtu; + } + } + + wqe->state = wqe_state_posted; + } +} + +void rnr_nak_timer(struct timer_list *t) +{ + struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer); + + pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp)); + rxe_run_task(&qp->req.task, 1); +} + +static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp) +{ + struct rxe_send_wqe *wqe = queue_head(qp->sq.queue); + unsigned long flags; + + if (unlikely(qp->req.state == QP_STATE_DRAIN)) { + /* check to see if we are drained; + * state_lock used by requester and completer + */ + spin_lock_irqsave(&qp->state_lock, flags); + do { + if (qp->req.state != QP_STATE_DRAIN) { + /* comp just finished */ + spin_unlock_irqrestore(&qp->state_lock, + flags); + break; + } + + if (wqe && ((qp->req.wqe_index != + consumer_index(qp->sq.queue)) || + (wqe->state != wqe_state_posted))) { + /* comp not done yet */ + spin_unlock_irqrestore(&qp->state_lock, + flags); + break; + } + + qp->req.state = QP_STATE_DRAINED; + spin_unlock_irqrestore(&qp->state_lock, flags); + + if (qp->ibqp.event_handler) { + struct ib_event ev; + + ev.device = qp->ibqp.device; + ev.element.qp = &qp->ibqp; + ev.event = IB_EVENT_SQ_DRAINED; + qp->ibqp.event_handler(&ev, + qp->ibqp.qp_context); + } + } while (0); + } + + if (qp->req.wqe_index == producer_index(qp->sq.queue)) + return NULL; + + wqe = addr_from_index(qp->sq.queue, qp->req.wqe_index); + + if (unlikely((qp->req.state == QP_STATE_DRAIN || + qp->req.state == QP_STATE_DRAINED) && + (wqe->state != wqe_state_processing))) + return NULL; + + if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) && + (qp->req.wqe_index != consumer_index(qp->sq.queue)))) { + qp->req.wait_fence = 1; + return NULL; + } + + wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp); + return wqe; +} + +static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits) +{ + switch (opcode) { + case IB_WR_RDMA_WRITE: + if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || + qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) + return fits ? + IB_OPCODE_RC_RDMA_WRITE_LAST : + IB_OPCODE_RC_RDMA_WRITE_MIDDLE; + else + return fits ? + IB_OPCODE_RC_RDMA_WRITE_ONLY : + IB_OPCODE_RC_RDMA_WRITE_FIRST; + + case IB_WR_RDMA_WRITE_WITH_IMM: + if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || + qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) + return fits ? + IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE : + IB_OPCODE_RC_RDMA_WRITE_MIDDLE; + else + return fits ? + IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : + IB_OPCODE_RC_RDMA_WRITE_FIRST; + + case IB_WR_SEND: + if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || + qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) + return fits ? + IB_OPCODE_RC_SEND_LAST : + IB_OPCODE_RC_SEND_MIDDLE; + else + return fits ? + IB_OPCODE_RC_SEND_ONLY : + IB_OPCODE_RC_SEND_FIRST; + + case IB_WR_SEND_WITH_IMM: + if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || + qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) + return fits ? + IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE : + IB_OPCODE_RC_SEND_MIDDLE; + else + return fits ? + IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE : + IB_OPCODE_RC_SEND_FIRST; + + case IB_WR_RDMA_READ: + return IB_OPCODE_RC_RDMA_READ_REQUEST; + + case IB_WR_ATOMIC_CMP_AND_SWP: + return IB_OPCODE_RC_COMPARE_SWAP; + + case IB_WR_ATOMIC_FETCH_AND_ADD: + return IB_OPCODE_RC_FETCH_ADD; + + case IB_WR_SEND_WITH_INV: + if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || + qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) + return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE : + IB_OPCODE_RC_SEND_MIDDLE; + else + return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE : + IB_OPCODE_RC_SEND_FIRST; + case IB_WR_REG_MR: + case IB_WR_LOCAL_INV: + return opcode; + } + + return -EINVAL; +} + +static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits) +{ + switch (opcode) { + case IB_WR_RDMA_WRITE: + if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || + qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) + return fits ? + IB_OPCODE_UC_RDMA_WRITE_LAST : + IB_OPCODE_UC_RDMA_WRITE_MIDDLE; + else + return fits ? + IB_OPCODE_UC_RDMA_WRITE_ONLY : + IB_OPCODE_UC_RDMA_WRITE_FIRST; + + case IB_WR_RDMA_WRITE_WITH_IMM: + if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || + qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) + return fits ? + IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE : + IB_OPCODE_UC_RDMA_WRITE_MIDDLE; + else + return fits ? + IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : + IB_OPCODE_UC_RDMA_WRITE_FIRST; + + case IB_WR_SEND: + if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || + qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) + return fits ? + IB_OPCODE_UC_SEND_LAST : + IB_OPCODE_UC_SEND_MIDDLE; + else + return fits ? + IB_OPCODE_UC_SEND_ONLY : + IB_OPCODE_UC_SEND_FIRST; + + case IB_WR_SEND_WITH_IMM: + if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || + qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) + return fits ? + IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE : + IB_OPCODE_UC_SEND_MIDDLE; + else + return fits ? + IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE : + IB_OPCODE_UC_SEND_FIRST; + } + + return -EINVAL; +} + +static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, + u32 opcode) +{ + int fits = (wqe->dma.resid <= qp->mtu); + + switch (qp_type(qp)) { + case IB_QPT_RC: + return next_opcode_rc(qp, opcode, fits); + + case IB_QPT_UC: + return next_opcode_uc(qp, opcode, fits); + + case IB_QPT_SMI: + case IB_QPT_UD: + case IB_QPT_GSI: + switch (opcode) { + case IB_WR_SEND: + return IB_OPCODE_UD_SEND_ONLY; + + case IB_WR_SEND_WITH_IMM: + return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; + } + break; + + default: + break; + } + + return -EINVAL; +} + +static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe) +{ + int depth; + + if (wqe->has_rd_atomic) + return 0; + + qp->req.need_rd_atomic = 1; + depth = atomic_dec_return(&qp->req.rd_atomic); + + if (depth >= 0) { + qp->req.need_rd_atomic = 0; + wqe->has_rd_atomic = 1; + return 0; + } + + atomic_inc(&qp->req.rd_atomic); + return -EAGAIN; +} + +static inline int get_mtu(struct rxe_qp *qp) +{ + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + + if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC)) + return qp->mtu; + + return rxe->port.mtu_cap; +} + +static struct sk_buff *init_req_packet(struct rxe_qp *qp, + struct rxe_send_wqe *wqe, + int opcode, int payload, + struct rxe_pkt_info *pkt) +{ + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + struct rxe_port *port = &rxe->port; + struct sk_buff *skb; + struct rxe_send_wr *ibwr = &wqe->wr; + struct rxe_av *av; + int pad = (-payload) & 0x3; + int paylen; + int solicited; + u16 pkey; + u32 qp_num; + int ack_req; + + /* length from start of bth to end of icrc */ + paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; + + /* pkt->hdr, rxe, port_num and mask are initialized in ifc + * layer + */ + pkt->opcode = opcode; + pkt->qp = qp; + pkt->psn = qp->req.psn; + pkt->mask = rxe_opcode[opcode].mask; + pkt->paylen = paylen; + pkt->offset = 0; + pkt->wqe = wqe; + + /* init skb */ + av = rxe_get_av(pkt); + skb = rxe_init_packet(rxe, av, paylen, pkt); + if (unlikely(!skb)) + return NULL; + + /* init bth */ + solicited = (ibwr->send_flags & IB_SEND_SOLICITED) && + (pkt->mask & RXE_END_MASK) && + ((pkt->mask & (RXE_SEND_MASK)) || + (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) == + (RXE_WRITE_MASK | RXE_IMMDT_MASK)); + + pkey = (qp_type(qp) == IB_QPT_GSI) ? + port->pkey_tbl[ibwr->wr.ud.pkey_index] : + port->pkey_tbl[qp->attr.pkey_index]; + + qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn : + qp->attr.dest_qp_num; + + ack_req = ((pkt->mask & RXE_END_MASK) || + (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK)); + if (ack_req) + qp->req.noack_pkts = 0; + + bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num, + ack_req, pkt->psn); + + /* init optional headers */ + if (pkt->mask & RXE_RETH_MASK) { + reth_set_rkey(pkt, ibwr->wr.rdma.rkey); + reth_set_va(pkt, wqe->iova); + reth_set_len(pkt, wqe->dma.resid); + } + + if (pkt->mask & RXE_IMMDT_MASK) + immdt_set_imm(pkt, ibwr->ex.imm_data); + + if (pkt->mask & RXE_IETH_MASK) + ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey); + + if (pkt->mask & RXE_ATMETH_MASK) { + atmeth_set_va(pkt, wqe->iova); + if (opcode == IB_OPCODE_RC_COMPARE_SWAP || + opcode == IB_OPCODE_RD_COMPARE_SWAP) { + atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap); + atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add); + } else { + atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add); + } + atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey); + } + + if (pkt->mask & RXE_DETH_MASK) { + if (qp->ibqp.qp_num == 1) + deth_set_qkey(pkt, GSI_QKEY); + else + deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey); + deth_set_sqp(pkt, qp->ibqp.qp_num); + } + + return skb; +} + +static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe, + struct rxe_pkt_info *pkt, struct sk_buff *skb, + int paylen) +{ + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + u32 crc = 0; + u32 *p; + int err; + + err = rxe_prepare(rxe, pkt, skb, &crc); + if (err) + return err; + + if (pkt->mask & RXE_WRITE_OR_SEND) { + if (wqe->wr.send_flags & IB_SEND_INLINE) { + u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset]; + + crc = rxe_crc32(rxe, crc, tmp, paylen); + memcpy(payload_addr(pkt), tmp, paylen); + + wqe->dma.resid -= paylen; + wqe->dma.sge_offset += paylen; + } else { + err = copy_data(qp->pd, 0, &wqe->dma, + payload_addr(pkt), paylen, + from_mem_obj, + &crc); + if (err) + return err; + } + if (bth_pad(pkt)) { + u8 *pad = payload_addr(pkt) + paylen; + + memset(pad, 0, bth_pad(pkt)); + crc = rxe_crc32(rxe, crc, pad, bth_pad(pkt)); + } + } + p = payload_addr(pkt) + paylen + bth_pad(pkt); + + *p = ~crc; + + return 0; +} + +static void update_wqe_state(struct rxe_qp *qp, + struct rxe_send_wqe *wqe, + struct rxe_pkt_info *pkt) +{ + if (pkt->mask & RXE_END_MASK) { + if (qp_type(qp) == IB_QPT_RC) + wqe->state = wqe_state_pending; + } else { + wqe->state = wqe_state_processing; + } +} + +static void update_wqe_psn(struct rxe_qp *qp, + struct rxe_send_wqe *wqe, + struct rxe_pkt_info *pkt, + int payload) +{ + /* number of packets left to send including current one */ + int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu; + + /* handle zero length packet case */ + if (num_pkt == 0) + num_pkt = 1; + + if (pkt->mask & RXE_START_MASK) { + wqe->first_psn = qp->req.psn; + wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK; + } + + if (pkt->mask & RXE_READ_MASK) + qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK; + else + qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; +} + +static void save_state(struct rxe_send_wqe *wqe, + struct rxe_qp *qp, + struct rxe_send_wqe *rollback_wqe, + u32 *rollback_psn) +{ + rollback_wqe->state = wqe->state; + rollback_wqe->first_psn = wqe->first_psn; + rollback_wqe->last_psn = wqe->last_psn; + *rollback_psn = qp->req.psn; +} + +static void rollback_state(struct rxe_send_wqe *wqe, + struct rxe_qp *qp, + struct rxe_send_wqe *rollback_wqe, + u32 rollback_psn) +{ + wqe->state = rollback_wqe->state; + wqe->first_psn = rollback_wqe->first_psn; + wqe->last_psn = rollback_wqe->last_psn; + qp->req.psn = rollback_psn; +} + +static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe, + struct rxe_pkt_info *pkt, int payload) +{ + qp->req.opcode = pkt->opcode; + + if (pkt->mask & RXE_END_MASK) + qp->req.wqe_index = next_index(qp->sq.queue, qp->req.wqe_index); + + qp->need_req_skb = 0; + + if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer)) + mod_timer(&qp->retrans_timer, + jiffies + qp->qp_timeout_jiffies); +} + +int rxe_requester(void *arg) +{ + struct rxe_qp *qp = (struct rxe_qp *)arg; + struct rxe_pkt_info pkt; + struct sk_buff *skb; + struct rxe_send_wqe *wqe; + enum rxe_hdr_mask mask; + int payload; + int mtu; + int opcode; + int ret; + struct rxe_send_wqe rollback_wqe; + u32 rollback_psn; + + rxe_add_ref(qp); + +next_wqe: + if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR)) + goto exit; + + if (unlikely(qp->req.state == QP_STATE_RESET)) { + qp->req.wqe_index = consumer_index(qp->sq.queue); + qp->req.opcode = -1; + qp->req.need_rd_atomic = 0; + qp->req.wait_psn = 0; + qp->req.need_retry = 0; + goto exit; + } + + if (unlikely(qp->req.need_retry)) { + req_retry(qp); + qp->req.need_retry = 0; + } + + wqe = req_next_wqe(qp); + if (unlikely(!wqe)) + goto exit; + + if (wqe->mask & WR_REG_MASK) { + if (wqe->wr.opcode == IB_WR_LOCAL_INV) { + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + struct rxe_mem *rmr; + + rmr = rxe_pool_get_index(&rxe->mr_pool, + wqe->wr.ex.invalidate_rkey >> 8); + if (!rmr) { + pr_err("No mr for key %#x\n", + wqe->wr.ex.invalidate_rkey); + wqe->state = wqe_state_error; + wqe->status = IB_WC_MW_BIND_ERR; + goto exit; + } + rmr->state = RXE_MEM_STATE_FREE; + rxe_drop_ref(rmr); + wqe->state = wqe_state_done; + wqe->status = IB_WC_SUCCESS; + } else if (wqe->wr.opcode == IB_WR_REG_MR) { + struct rxe_mem *rmr = to_rmr(wqe->wr.wr.reg.mr); + + rmr->state = RXE_MEM_STATE_VALID; + rmr->access = wqe->wr.wr.reg.access; + rmr->lkey = wqe->wr.wr.reg.key; + rmr->rkey = wqe->wr.wr.reg.key; + rmr->iova = wqe->wr.wr.reg.mr->iova; + wqe->state = wqe_state_done; + wqe->status = IB_WC_SUCCESS; + } else { + goto exit; + } + if ((wqe->wr.send_flags & IB_SEND_SIGNALED) || + qp->sq_sig_type == IB_SIGNAL_ALL_WR) + rxe_run_task(&qp->comp.task, 1); + qp->req.wqe_index = next_index(qp->sq.queue, + qp->req.wqe_index); + goto next_wqe; + } + + if (unlikely(qp_type(qp) == IB_QPT_RC && + psn_compare(qp->req.psn, (qp->comp.psn + + RXE_MAX_UNACKED_PSNS)) > 0)) { + qp->req.wait_psn = 1; + goto exit; + } + + /* Limit the number of inflight SKBs per QP */ + if (unlikely(atomic_read(&qp->skb_out) > + RXE_INFLIGHT_SKBS_PER_QP_HIGH)) { + qp->need_req_skb = 1; + goto exit; + } + + opcode = next_opcode(qp, wqe, wqe->wr.opcode); + if (unlikely(opcode < 0)) { + wqe->status = IB_WC_LOC_QP_OP_ERR; + goto err; + } + + mask = rxe_opcode[opcode].mask; + if (unlikely(mask & RXE_READ_OR_ATOMIC)) { + if (check_init_depth(qp, wqe)) + goto exit; + } + + mtu = get_mtu(qp); + payload = (mask & RXE_WRITE_OR_SEND) ? wqe->dma.resid : 0; + if (payload > mtu) { + if (qp_type(qp) == IB_QPT_UD) { + /* C10-93.1.1: If the total sum of all the buffer lengths specified for a + * UD message exceeds the MTU of the port as returned by QueryHCA, the CI + * shall not emit any packets for this message. Further, the CI shall not + * generate an error due to this condition. + */ + + /* fake a successful UD send */ + wqe->first_psn = qp->req.psn; + wqe->last_psn = qp->req.psn; + qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; + qp->req.opcode = IB_OPCODE_UD_SEND_ONLY; + qp->req.wqe_index = next_index(qp->sq.queue, + qp->req.wqe_index); + wqe->state = wqe_state_done; + wqe->status = IB_WC_SUCCESS; + __rxe_do_task(&qp->comp.task); + rxe_drop_ref(qp); + return 0; + } + payload = mtu; + } + + skb = init_req_packet(qp, wqe, opcode, payload, &pkt); + if (unlikely(!skb)) { + pr_err("qp#%d Failed allocating skb\n", qp_num(qp)); + goto err; + } + + if (fill_packet(qp, wqe, &pkt, skb, payload)) { + pr_debug("qp#%d Error during fill packet\n", qp_num(qp)); + kfree_skb(skb); + goto err; + } + + /* + * To prevent a race on wqe access between requester and completer, + * wqe members state and psn need to be set before calling + * rxe_xmit_packet(). + * Otherwise, completer might initiate an unjustified retry flow. + */ + save_state(wqe, qp, &rollback_wqe, &rollback_psn); + update_wqe_state(qp, wqe, &pkt); + update_wqe_psn(qp, wqe, &pkt, payload); + ret = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp, &pkt, skb); + if (ret) { + qp->need_req_skb = 1; + + rollback_state(wqe, qp, &rollback_wqe, rollback_psn); + + if (ret == -EAGAIN) { + rxe_run_task(&qp->req.task, 1); + goto exit; + } + + goto err; + } + + update_state(qp, wqe, &pkt, payload); + + goto next_wqe; + +err: + wqe->status = IB_WC_LOC_PROT_ERR; + wqe->state = wqe_state_error; + __rxe_do_task(&qp->comp.task); + +exit: + rxe_drop_ref(qp); + return -EAGAIN; +} |