/* * Copyright (c) 2013-2015, Mellanox Technologies. 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 #include #include #include #include "mlx5_ib.h" static void mlx5_ib_cq_comp(struct mlx5_core_cq *cq) { struct ib_cq *ibcq = &to_mibcq(cq)->ibcq; ibcq->comp_handler(ibcq, ibcq->cq_context); } static void mlx5_ib_cq_event(struct mlx5_core_cq *mcq, enum mlx5_event type) { struct mlx5_ib_cq *cq = container_of(mcq, struct mlx5_ib_cq, mcq); struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device); struct ib_cq *ibcq = &cq->ibcq; struct ib_event event; if (type != MLX5_EVENT_TYPE_CQ_ERROR) { mlx5_ib_warn(dev, "Unexpected event type %d on CQ %06x\n", type, mcq->cqn); return; } if (ibcq->event_handler) { event.device = &dev->ib_dev; event.event = IB_EVENT_CQ_ERR; event.element.cq = ibcq; ibcq->event_handler(&event, ibcq->cq_context); } } static void *get_cqe(struct mlx5_ib_cq *cq, int n) { return mlx5_frag_buf_get_wqe(&cq->buf.fbc, n); } static u8 sw_ownership_bit(int n, int nent) { return (n & nent) ? 1 : 0; } static void *get_sw_cqe(struct mlx5_ib_cq *cq, int n) { void *cqe = get_cqe(cq, n & cq->ibcq.cqe); struct mlx5_cqe64 *cqe64; cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64; if (likely((cqe64->op_own) >> 4 != MLX5_CQE_INVALID) && !((cqe64->op_own & MLX5_CQE_OWNER_MASK) ^ !!(n & (cq->ibcq.cqe + 1)))) { return cqe; } else { return NULL; } } static void *next_cqe_sw(struct mlx5_ib_cq *cq) { return get_sw_cqe(cq, cq->mcq.cons_index); } static enum ib_wc_opcode get_umr_comp(struct mlx5_ib_wq *wq, int idx) { switch (wq->wr_data[idx]) { case MLX5_IB_WR_UMR: return 0; case IB_WR_LOCAL_INV: return IB_WC_LOCAL_INV; case IB_WR_REG_MR: return IB_WC_REG_MR; default: pr_warn("unknown completion status\n"); return 0; } } static void handle_good_req(struct ib_wc *wc, struct mlx5_cqe64 *cqe, struct mlx5_ib_wq *wq, int idx) { wc->wc_flags = 0; switch (be32_to_cpu(cqe->sop_drop_qpn) >> 24) { case MLX5_OPCODE_RDMA_WRITE_IMM: wc->wc_flags |= IB_WC_WITH_IMM; /* fall through */ case MLX5_OPCODE_RDMA_WRITE: wc->opcode = IB_WC_RDMA_WRITE; break; case MLX5_OPCODE_SEND_IMM: wc->wc_flags |= IB_WC_WITH_IMM; /* fall through */ case MLX5_OPCODE_SEND: case MLX5_OPCODE_SEND_INVAL: wc->opcode = IB_WC_SEND; break; case MLX5_OPCODE_RDMA_READ: wc->opcode = IB_WC_RDMA_READ; wc->byte_len = be32_to_cpu(cqe->byte_cnt); break; case MLX5_OPCODE_ATOMIC_CS: wc->opcode = IB_WC_COMP_SWAP; wc->byte_len = 8; break; case MLX5_OPCODE_ATOMIC_FA: wc->opcode = IB_WC_FETCH_ADD; wc->byte_len = 8; break; case MLX5_OPCODE_ATOMIC_MASKED_CS: wc->opcode = IB_WC_MASKED_COMP_SWAP; wc->byte_len = 8; break; case MLX5_OPCODE_ATOMIC_MASKED_FA: wc->opcode = IB_WC_MASKED_FETCH_ADD; wc->byte_len = 8; break; case MLX5_OPCODE_UMR: wc->opcode = get_umr_comp(wq, idx); break; } } enum { MLX5_GRH_IN_BUFFER = 1, MLX5_GRH_IN_CQE = 2, }; static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe, struct mlx5_ib_qp *qp) { enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1); struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device); struct mlx5_ib_srq *srq; struct mlx5_ib_wq *wq; u16 wqe_ctr; u8 roce_packet_type; bool vlan_present; u8 g; if (qp->ibqp.srq || qp->ibqp.xrcd) { struct mlx5_core_srq *msrq = NULL; if (qp->ibqp.xrcd) { msrq = mlx5_core_get_srq(dev->mdev, be32_to_cpu(cqe->srqn)); srq = to_mibsrq(msrq); } else { srq = to_msrq(qp->ibqp.srq); } if (srq) { wqe_ctr = be16_to_cpu(cqe->wqe_counter); wc->wr_id = srq->wrid[wqe_ctr]; mlx5_ib_free_srq_wqe(srq, wqe_ctr); if (msrq && atomic_dec_and_test(&msrq->refcount)) complete(&msrq->free); } } else { wq = &qp->rq; wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)]; ++wq->tail; } wc->byte_len = be32_to_cpu(cqe->byte_cnt); switch (cqe->op_own >> 4) { case MLX5_CQE_RESP_WR_IMM: wc->opcode = IB_WC_RECV_RDMA_WITH_IMM; wc->wc_flags = IB_WC_WITH_IMM; wc->ex.imm_data = cqe->imm_inval_pkey; break; case MLX5_CQE_RESP_SEND: wc->opcode = IB_WC_RECV; wc->wc_flags = IB_WC_IP_CSUM_OK; if (unlikely(!((cqe->hds_ip_ext & CQE_L3_OK) && (cqe->hds_ip_ext & CQE_L4_OK)))) wc->wc_flags = 0; break; case MLX5_CQE_RESP_SEND_IMM: wc->opcode = IB_WC_RECV; wc->wc_flags = IB_WC_WITH_IMM; wc->ex.imm_data = cqe->imm_inval_pkey; break; case MLX5_CQE_RESP_SEND_INV: wc->opcode = IB_WC_RECV; wc->wc_flags = IB_WC_WITH_INVALIDATE; wc->ex.invalidate_rkey = be32_to_cpu(cqe->imm_inval_pkey); break; } wc->src_qp = be32_to_cpu(cqe->flags_rqpn) & 0xffffff; wc->dlid_path_bits = cqe->ml_path; g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3; wc->wc_flags |= g ? IB_WC_GRH : 0; if (unlikely(is_qp1(qp->ibqp.qp_type))) { u16 pkey = be32_to_cpu(cqe->imm_inval_pkey) & 0xffff; ib_find_cached_pkey(&dev->ib_dev, qp->port, pkey, &wc->pkey_index); } else { wc->pkey_index = 0; } if (ll != IB_LINK_LAYER_ETHERNET) { wc->slid = be16_to_cpu(cqe->slid); wc->sl = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0xf; return; } wc->slid = 0; vlan_present = cqe->l4_l3_hdr_type & 0x1; roce_packet_type = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0x3; if (vlan_present) { wc->vlan_id = (be16_to_cpu(cqe->vlan_info)) & 0xfff; wc->sl = (be16_to_cpu(cqe->vlan_info) >> 13) & 0x7; wc->wc_flags |= IB_WC_WITH_VLAN; } else { wc->sl = 0; } switch (roce_packet_type) { case MLX5_CQE_ROCE_L3_HEADER_TYPE_GRH: wc->network_hdr_type = RDMA_NETWORK_IB; break; case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV6: wc->network_hdr_type = RDMA_NETWORK_IPV6; break; case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV4: wc->network_hdr_type = RDMA_NETWORK_IPV4; break; } wc->wc_flags |= IB_WC_WITH_NETWORK_HDR_TYPE; } static void dump_cqe(struct mlx5_ib_dev *dev, struct mlx5_err_cqe *cqe) { mlx5_ib_warn(dev, "dump error cqe\n"); mlx5_dump_err_cqe(dev->mdev, cqe); } static void mlx5_handle_error_cqe(struct mlx5_ib_dev *dev, struct mlx5_err_cqe *cqe, struct ib_wc *wc) { int dump = 1; switch (cqe->syndrome) { case MLX5_CQE_SYNDROME_LOCAL_LENGTH_ERR: wc->status = IB_WC_LOC_LEN_ERR; break; case MLX5_CQE_SYNDROME_LOCAL_QP_OP_ERR: wc->status = IB_WC_LOC_QP_OP_ERR; break; case MLX5_CQE_SYNDROME_LOCAL_PROT_ERR: wc->status = IB_WC_LOC_PROT_ERR; break; case MLX5_CQE_SYNDROME_WR_FLUSH_ERR: dump = 0; wc->status = IB_WC_WR_FLUSH_ERR; break; case MLX5_CQE_SYNDROME_MW_BIND_ERR: wc->status = IB_WC_MW_BIND_ERR; break; case MLX5_CQE_SYNDROME_BAD_RESP_ERR: wc->status = IB_WC_BAD_RESP_ERR; break; case MLX5_CQE_SYNDROME_LOCAL_ACCESS_ERR: wc->status = IB_WC_LOC_ACCESS_ERR; break; case MLX5_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR: wc->status = IB_WC_REM_INV_REQ_ERR; break; case MLX5_CQE_SYNDROME_REMOTE_ACCESS_ERR: wc->status = IB_WC_REM_ACCESS_ERR; break; case MLX5_CQE_SYNDROME_REMOTE_OP_ERR: wc->status = IB_WC_REM_OP_ERR; break; case MLX5_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR: wc->status = IB_WC_RETRY_EXC_ERR; dump = 0; break; case MLX5_CQE_SYNDROME_RNR_RETRY_EXC_ERR: wc->status = IB_WC_RNR_RETRY_EXC_ERR; dump = 0; break; case MLX5_CQE_SYNDROME_REMOTE_ABORTED_ERR: wc->status = IB_WC_REM_ABORT_ERR; break; default: wc->status = IB_WC_GENERAL_ERR; break; } wc->vendor_err = cqe->vendor_err_synd; if (dump) dump_cqe(dev, cqe); } static int is_atomic_response(struct mlx5_ib_qp *qp, uint16_t idx) { /* TBD: waiting decision */ return 0; } static void *mlx5_get_atomic_laddr(struct mlx5_ib_qp *qp, uint16_t idx) { struct mlx5_wqe_data_seg *dpseg; void *addr; dpseg = mlx5_get_send_wqe(qp, idx) + sizeof(struct mlx5_wqe_ctrl_seg) + sizeof(struct mlx5_wqe_raddr_seg) + sizeof(struct mlx5_wqe_atomic_seg); addr = (void *)(unsigned long)be64_to_cpu(dpseg->addr); return addr; } static void handle_atomic(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64, uint16_t idx) { void *addr; int byte_count; int i; if (!is_atomic_response(qp, idx)) return; byte_count = be32_to_cpu(cqe64->byte_cnt); addr = mlx5_get_atomic_laddr(qp, idx); if (byte_count == 4) { *(uint32_t *)addr = be32_to_cpu(*((__be32 *)addr)); } else { for (i = 0; i < byte_count; i += 8) { *(uint64_t *)addr = be64_to_cpu(*((__be64 *)addr)); addr += 8; } } return; } static void handle_atomics(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64, u16 tail, u16 head) { u16 idx; do { idx = tail & (qp->sq.wqe_cnt - 1); handle_atomic(qp, cqe64, idx); if (idx == head) break; tail = qp->sq.w_list[idx].next; } while (1); tail = qp->sq.w_list[idx].next; qp->sq.last_poll = tail; } static void free_cq_buf(struct mlx5_ib_dev *dev, struct mlx5_ib_cq_buf *buf) { mlx5_frag_buf_free(dev->mdev, &buf->fbc.frag_buf); } static void get_sig_err_item(struct mlx5_sig_err_cqe *cqe, struct ib_sig_err *item) { u16 syndrome = be16_to_cpu(cqe->syndrome); #define GUARD_ERR (1 << 13) #define APPTAG_ERR (1 << 12) #define REFTAG_ERR (1 << 11) if (syndrome & GUARD_ERR) { item->err_type = IB_SIG_BAD_GUARD; item->expected = be32_to_cpu(cqe->expected_trans_sig) >> 16; item->actual = be32_to_cpu(cqe->actual_trans_sig) >> 16; } else if (syndrome & REFTAG_ERR) { item->err_type = IB_SIG_BAD_REFTAG; item->expected = be32_to_cpu(cqe->expected_reftag); item->actual = be32_to_cpu(cqe->actual_reftag); } else if (syndrome & APPTAG_ERR) { item->err_type = IB_SIG_BAD_APPTAG; item->expected = be32_to_cpu(cqe->expected_trans_sig) & 0xffff; item->actual = be32_to_cpu(cqe->actual_trans_sig) & 0xffff; } else { pr_err("Got signature completion error with bad syndrome %04x\n", syndrome); } item->sig_err_offset = be64_to_cpu(cqe->err_offset); item->key = be32_to_cpu(cqe->mkey); } static void sw_send_comp(struct mlx5_ib_qp *qp, int num_entries, struct ib_wc *wc, int *npolled) { struct mlx5_ib_wq *wq; unsigned int cur; unsigned int idx; int np; int i; wq = &qp->sq; cur = wq->head - wq->tail; np = *npolled; if (cur == 0) return; for (i = 0; i < cur && np < num_entries; i++) { idx = wq->last_poll & (wq->wqe_cnt - 1); wc->wr_id = wq->wrid[idx]; wc->status = IB_WC_WR_FLUSH_ERR; wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR; wq->tail++; np++; wc->qp = &qp->ibqp; wc++; wq->last_poll = wq->w_list[idx].next; } *npolled = np; } static void sw_recv_comp(struct mlx5_ib_qp *qp, int num_entries, struct ib_wc *wc, int *npolled) { struct mlx5_ib_wq *wq; unsigned int cur; int np; int i; wq = &qp->rq; cur = wq->head - wq->tail; np = *npolled; if (cur == 0) return; for (i = 0; i < cur && np < num_entries; i++) { wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)]; wc->status = IB_WC_WR_FLUSH_ERR; wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR; wq->tail++; np++; wc->qp = &qp->ibqp; wc++; } *npolled = np; } static void mlx5_ib_poll_sw_comp(struct mlx5_ib_cq *cq, int num_entries, struct ib_wc *wc, int *npolled) { struct mlx5_ib_qp *qp; *npolled = 0; /* Find uncompleted WQEs belonging to that cq and return mmics ones */ list_for_each_entry(qp, &cq->list_send_qp, cq_send_list) { sw_send_comp(qp, num_entries, wc + *npolled, npolled); if (*npolled >= num_entries) return; } list_for_each_entry(qp, &cq->list_recv_qp, cq_recv_list) { sw_recv_comp(qp, num_entries, wc + *npolled, npolled); if (*npolled >= num_entries) return; } } static int mlx5_poll_one(struct mlx5_ib_cq *cq, struct mlx5_ib_qp **cur_qp, struct ib_wc *wc) { struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device); struct mlx5_err_cqe *err_cqe; struct mlx5_cqe64 *cqe64; struct mlx5_core_qp *mqp; struct mlx5_ib_wq *wq; struct mlx5_sig_err_cqe *sig_err_cqe; struct mlx5_core_mkey *mmkey; struct mlx5_ib_mr *mr; uint8_t opcode; uint32_t qpn; u16 wqe_ctr; void *cqe; int idx; repoll: cqe = next_cqe_sw(cq); if (!cqe) return -EAGAIN; cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64; ++cq->mcq.cons_index; /* Make sure we read CQ entry contents after we've checked the * ownership bit. */ rmb(); opcode = cqe64->op_own >> 4; if (unlikely(opcode == MLX5_CQE_RESIZE_CQ)) { if (likely(cq->resize_buf)) { free_cq_buf(dev, &cq->buf); cq->buf = *cq->resize_buf; kfree(cq->resize_buf); cq->resize_buf = NULL; goto repoll; } else { mlx5_ib_warn(dev, "unexpected resize cqe\n"); } } qpn = ntohl(cqe64->sop_drop_qpn) & 0xffffff; if (!*cur_qp || (qpn != (*cur_qp)->ibqp.qp_num)) { /* We do not have to take the QP table lock here, * because CQs will be locked while QPs are removed * from the table. */ mqp = __mlx5_qp_lookup(dev->mdev, qpn); *cur_qp = to_mibqp(mqp); } wc->qp = &(*cur_qp)->ibqp; switch (opcode) { case MLX5_CQE_REQ: wq = &(*cur_qp)->sq; wqe_ctr = be16_to_cpu(cqe64->wqe_counter); idx = wqe_ctr & (wq->wqe_cnt - 1); handle_good_req(wc, cqe64, wq, idx); handle_atomics(*cur_qp, cqe64, wq->last_poll, idx); wc->wr_id = wq->wrid[idx]; wq->tail = wq->wqe_head[idx] + 1; wc->status = IB_WC_SUCCESS; break; case MLX5_CQE_RESP_WR_IMM: case MLX5_CQE_RESP_SEND: case MLX5_CQE_RESP_SEND_IMM: case MLX5_CQE_RESP_SEND_INV: handle_responder(wc, cqe64, *cur_qp); wc->status = IB_WC_SUCCESS; break; case MLX5_CQE_RESIZE_CQ: break; case MLX5_CQE_REQ_ERR: case MLX5_CQE_RESP_ERR: err_cqe = (struct mlx5_err_cqe *)cqe64; mlx5_handle_error_cqe(dev, err_cqe, wc); mlx5_ib_dbg(dev, "%s error cqe on cqn 0x%x:\n", opcode == MLX5_CQE_REQ_ERR ? "Requestor" : "Responder", cq->mcq.cqn); mlx5_ib_dbg(dev, "syndrome 0x%x, vendor syndrome 0x%x\n", err_cqe->syndrome, err_cqe->vendor_err_synd); if (opcode == MLX5_CQE_REQ_ERR) { wq = &(*cur_qp)->sq; wqe_ctr = be16_to_cpu(cqe64->wqe_counter); idx = wqe_ctr & (wq->wqe_cnt - 1); wc->wr_id = wq->wrid[idx]; wq->tail = wq->wqe_head[idx] + 1; } else { struct mlx5_ib_srq *srq; if ((*cur_qp)->ibqp.srq) { srq = to_msrq((*cur_qp)->ibqp.srq); wqe_ctr = be16_to_cpu(cqe64->wqe_counter); wc->wr_id = srq->wrid[wqe_ctr]; mlx5_ib_free_srq_wqe(srq, wqe_ctr); } else { wq = &(*cur_qp)->rq; wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)]; ++wq->tail; } } break; case MLX5_CQE_SIG_ERR: sig_err_cqe = (struct mlx5_sig_err_cqe *)cqe64; read_lock(&dev->mdev->priv.mkey_table.lock); mmkey = __mlx5_mr_lookup(dev->mdev, mlx5_base_mkey(be32_to_cpu(sig_err_cqe->mkey))); mr = to_mibmr(mmkey); get_sig_err_item(sig_err_cqe, &mr->sig->err_item); mr->sig->sig_err_exists = true; mr->sig->sigerr_count++; mlx5_ib_warn(dev, "CQN: 0x%x Got SIGERR on key: 0x%x err_type %x err_offset %llx expected %x actual %x\n", cq->mcq.cqn, mr->sig->err_item.key, mr->sig->err_item.err_type, mr->sig->err_item.sig_err_offset, mr->sig->err_item.expected, mr->sig->err_item.actual); read_unlock(&dev->mdev->priv.mkey_table.lock); goto repoll; } return 0; } static int poll_soft_wc(struct mlx5_ib_cq *cq, int num_entries, struct ib_wc *wc, bool is_fatal_err) { struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device); struct mlx5_ib_wc *soft_wc, *next; int npolled = 0; list_for_each_entry_safe(soft_wc, next, &cq->wc_list, list) { if (npolled >= num_entries) break; mlx5_ib_dbg(dev, "polled software generated completion on CQ 0x%x\n", cq->mcq.cqn); if (unlikely(is_fatal_err)) { soft_wc->wc.status = IB_WC_WR_FLUSH_ERR; soft_wc->wc.vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR; } wc[npolled++] = soft_wc->wc; list_del(&soft_wc->list); kfree(soft_wc); } return npolled; } int mlx5_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc) { struct mlx5_ib_cq *cq = to_mcq(ibcq); struct mlx5_ib_qp *cur_qp = NULL; struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device); struct mlx5_core_dev *mdev = dev->mdev; unsigned long flags; int soft_polled = 0; int npolled; spin_lock_irqsave(&cq->lock, flags); if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { /* make sure no soft wqe's are waiting */ if (unlikely(!list_empty(&cq->wc_list))) soft_polled = poll_soft_wc(cq, num_entries, wc, true); mlx5_ib_poll_sw_comp(cq, num_entries - soft_polled, wc + soft_polled, &npolled); goto out; } if (unlikely(!list_empty(&cq->wc_list))) soft_polled = poll_soft_wc(cq, num_entries, wc, false); for (npolled = 0; npolled < num_entries - soft_polled; npolled++) { if (mlx5_poll_one(cq, &cur_qp, wc + soft_polled + npolled)) break; } if (npolled) mlx5_cq_set_ci(&cq->mcq); out: spin_unlock_irqrestore(&cq->lock, flags); return soft_polled + npolled; } int mlx5_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) { struct mlx5_core_dev *mdev = to_mdev(ibcq->device)->mdev; struct mlx5_ib_cq *cq = to_mcq(ibcq); void __iomem *uar_page = mdev->priv.uar->map; unsigned long irq_flags; int ret = 0; spin_lock_irqsave(&cq->lock, irq_flags); if (cq->notify_flags != IB_CQ_NEXT_COMP) cq->notify_flags = flags & IB_CQ_SOLICITED_MASK; if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !list_empty(&cq->wc_list)) ret = 1; spin_unlock_irqrestore(&cq->lock, irq_flags); mlx5_cq_arm(&cq->mcq, (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ? MLX5_CQ_DB_REQ_NOT_SOL : MLX5_CQ_DB_REQ_NOT, uar_page, to_mcq(ibcq)->mcq.cons_index); return ret; } static int alloc_cq_frag_buf(struct mlx5_ib_dev *dev, struct mlx5_ib_cq_buf *buf, int nent, int cqe_size) { struct mlx5_frag_buf_ctrl *c = &buf->fbc; struct mlx5_frag_buf *frag_buf = &c->frag_buf; u32 cqc_buff[MLX5_ST_SZ_DW(cqc)] = {0}; int err; MLX5_SET(cqc, cqc_buff, log_cq_size, ilog2(cqe_size)); MLX5_SET(cqc, cqc_buff, cqe_sz, (cqe_size == 128) ? 1 : 0); mlx5_core_init_cq_frag_buf(&buf->fbc, cqc_buff); err = mlx5_frag_buf_alloc_node(dev->mdev, nent * cqe_size, frag_buf, dev->mdev->priv.numa_node); if (err) return err; buf->cqe_size = cqe_size; buf->nent = nent; return 0; } enum { MLX5_CQE_RES_FORMAT_HASH = 0, MLX5_CQE_RES_FORMAT_CSUM = 1, MLX5_CQE_RES_FORMAT_CSUM_STRIDX = 3, }; static int mini_cqe_res_format_to_hw(struct mlx5_ib_dev *dev, u8 format) { switch (format) { case MLX5_IB_CQE_RES_FORMAT_HASH: return MLX5_CQE_RES_FORMAT_HASH; case MLX5_IB_CQE_RES_FORMAT_CSUM: return MLX5_CQE_RES_FORMAT_CSUM; case MLX5_IB_CQE_RES_FORMAT_CSUM_STRIDX: if (MLX5_CAP_GEN(dev->mdev, mini_cqe_resp_stride_index)) return MLX5_CQE_RES_FORMAT_CSUM_STRIDX; return -EOPNOTSUPP; default: return -EINVAL; } } static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata, struct ib_ucontext *context, struct mlx5_ib_cq *cq, int entries, u32 **cqb, int *cqe_size, int *index, int *inlen) { struct mlx5_ib_create_cq ucmd = {}; size_t ucmdlen; int page_shift; __be64 *pas; int npages; int ncont; void *cqc; int err; ucmdlen = udata->inlen < sizeof(ucmd) ? (sizeof(ucmd) - sizeof(ucmd.flags)) : sizeof(ucmd); if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) return -EFAULT; if (ucmdlen == sizeof(ucmd) && (ucmd.flags & ~(MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD))) return -EINVAL; if (ucmd.cqe_size != 64 && ucmd.cqe_size != 128) return -EINVAL; *cqe_size = ucmd.cqe_size; cq->buf.umem = ib_umem_get(context, ucmd.buf_addr, entries * ucmd.cqe_size, IB_ACCESS_LOCAL_WRITE, 1); if (IS_ERR(cq->buf.umem)) { err = PTR_ERR(cq->buf.umem); return err; } err = mlx5_ib_db_map_user(to_mucontext(context), ucmd.db_addr, &cq->db); if (err) goto err_umem; mlx5_ib_cont_pages(cq->buf.umem, ucmd.buf_addr, 0, &npages, &page_shift, &ncont, NULL); mlx5_ib_dbg(dev, "addr 0x%llx, size %u, npages %d, page_shift %d, ncont %d\n", ucmd.buf_addr, entries * ucmd.cqe_size, npages, page_shift, ncont); *inlen = MLX5_ST_SZ_BYTES(create_cq_in) + MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) * ncont; *cqb = kvzalloc(*inlen, GFP_KERNEL); if (!*cqb) { err = -ENOMEM; goto err_db; } pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas); mlx5_ib_populate_pas(dev, cq->buf.umem, page_shift, pas, 0); cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context); MLX5_SET(cqc, cqc, log_page_size, page_shift - MLX5_ADAPTER_PAGE_SHIFT); *index = to_mucontext(context)->bfregi.sys_pages[0]; if (ucmd.cqe_comp_en == 1) { int mini_cqe_format; if (!((*cqe_size == 128 && MLX5_CAP_GEN(dev->mdev, cqe_compression_128)) || (*cqe_size == 64 && MLX5_CAP_GEN(dev->mdev, cqe_compression)))) { err = -EOPNOTSUPP; mlx5_ib_warn(dev, "CQE compression is not supported for size %d!\n", *cqe_size); goto err_cqb; } mini_cqe_format = mini_cqe_res_format_to_hw(dev, ucmd.cqe_comp_res_format); if (mini_cqe_format < 0) { err = mini_cqe_format; mlx5_ib_dbg(dev, "CQE compression res format %d error: %d\n", ucmd.cqe_comp_res_format, err); goto err_cqb; } MLX5_SET(cqc, cqc, cqe_comp_en, 1); MLX5_SET(cqc, cqc, mini_cqe_res_format, mini_cqe_format); } if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD) { if (*cqe_size != 128 || !MLX5_CAP_GEN(dev->mdev, cqe_128_always)) { err = -EOPNOTSUPP; mlx5_ib_warn(dev, "CQE padding is not supported for CQE size of %dB!\n", *cqe_size); goto err_cqb; } cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD; } return 0; err_cqb: kvfree(*cqb); err_db: mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db); err_umem: ib_umem_release(cq->buf.umem); return err; } static void destroy_cq_user(struct mlx5_ib_cq *cq, struct ib_ucontext *context) { mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db); ib_umem_release(cq->buf.umem); } static void init_cq_frag_buf(struct mlx5_ib_cq *cq, struct mlx5_ib_cq_buf *buf) { int i; void *cqe; struct mlx5_cqe64 *cqe64; for (i = 0; i < buf->nent; i++) { cqe = get_cqe(cq, i); cqe64 = buf->cqe_size == 64 ? cqe : cqe + 64; cqe64->op_own = MLX5_CQE_INVALID << 4; } } static int create_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq, int entries, int cqe_size, u32 **cqb, int *index, int *inlen) { __be64 *pas; void *cqc; int err; err = mlx5_db_alloc(dev->mdev, &cq->db); if (err) return err; cq->mcq.set_ci_db = cq->db.db; cq->mcq.arm_db = cq->db.db + 1; cq->mcq.cqe_sz = cqe_size; err = alloc_cq_frag_buf(dev, &cq->buf, entries, cqe_size); if (err) goto err_db; init_cq_frag_buf(cq, &cq->buf); *inlen = MLX5_ST_SZ_BYTES(create_cq_in) + MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) * cq->buf.fbc.frag_buf.npages; *cqb = kvzalloc(*inlen, GFP_KERNEL); if (!*cqb) { err = -ENOMEM; goto err_buf; } pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas); mlx5_fill_page_frag_array(&cq->buf.fbc.frag_buf, pas); cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context); MLX5_SET(cqc, cqc, log_page_size, cq->buf.fbc.frag_buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT); *index = dev->mdev->priv.uar->index; return 0; err_buf: free_cq_buf(dev, &cq->buf); err_db: mlx5_db_free(dev->mdev, &cq->db); return err; } static void destroy_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq) { free_cq_buf(dev, &cq->buf); mlx5_db_free(dev->mdev, &cq->db); } static void notify_soft_wc_handler(struct work_struct *work) { struct mlx5_ib_cq *cq = container_of(work, struct mlx5_ib_cq, notify_work); cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context); } struct ib_cq *mlx5_ib_create_cq(struct ib_device *ibdev, const struct ib_cq_init_attr *attr, struct ib_ucontext *context, struct ib_udata *udata) { int entries = attr->cqe; int vector = attr->comp_vector; struct mlx5_ib_dev *dev = to_mdev(ibdev); struct mlx5_ib_cq *cq; int uninitialized_var(index); int uninitialized_var(inlen); u32 *cqb = NULL; void *cqc; int cqe_size; unsigned int irqn; int eqn; int err; if (entries < 0 || (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)))) return ERR_PTR(-EINVAL); if (check_cq_create_flags(attr->flags)) return ERR_PTR(-EOPNOTSUPP); entries = roundup_pow_of_two(entries + 1); if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))) return ERR_PTR(-EINVAL); cq = kzalloc(sizeof(*cq), GFP_KERNEL); if (!cq) return ERR_PTR(-ENOMEM); cq->ibcq.cqe = entries - 1; mutex_init(&cq->resize_mutex); spin_lock_init(&cq->lock); cq->resize_buf = NULL; cq->resize_umem = NULL; cq->create_flags = attr->flags; INIT_LIST_HEAD(&cq->list_send_qp); INIT_LIST_HEAD(&cq->list_recv_qp); if (context) { err = create_cq_user(dev, udata, context, cq, entries, &cqb, &cqe_size, &index, &inlen); if (err) goto err_create; } else { cqe_size = cache_line_size() == 128 ? 128 : 64; err = create_cq_kernel(dev, cq, entries, cqe_size, &cqb, &index, &inlen); if (err) goto err_create; INIT_WORK(&cq->notify_work, notify_soft_wc_handler); } err = mlx5_vector2eqn(dev->mdev, vector, &eqn, &irqn); if (err) goto err_cqb; cq->cqe_size = cqe_size; cqc = MLX5_ADDR_OF(create_cq_in, cqb, cq_context); MLX5_SET(cqc, cqc, cqe_sz, cqe_sz_to_mlx_sz(cqe_size, cq->private_flags & MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD)); MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries)); MLX5_SET(cqc, cqc, uar_page, index); MLX5_SET(cqc, cqc, c_eqn, eqn); MLX5_SET64(cqc, cqc, dbr_addr, cq->db.dma); if (cq->create_flags & IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN) MLX5_SET(cqc, cqc, oi, 1); err = mlx5_core_create_cq(dev->mdev, &cq->mcq, cqb, inlen); if (err) goto err_cqb; mlx5_ib_dbg(dev, "cqn 0x%x\n", cq->mcq.cqn); cq->mcq.irqn = irqn; if (context) cq->mcq.tasklet_ctx.comp = mlx5_ib_cq_comp; else cq->mcq.comp = mlx5_ib_cq_comp; cq->mcq.event = mlx5_ib_cq_event; INIT_LIST_HEAD(&cq->wc_list); if (context) if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof(__u32))) { err = -EFAULT; goto err_cmd; } kvfree(cqb); return &cq->ibcq; err_cmd: mlx5_core_destroy_cq(dev->mdev, &cq->mcq); err_cqb: kvfree(cqb); if (context) destroy_cq_user(cq, context); else destroy_cq_kernel(dev, cq); err_create: kfree(cq); return ERR_PTR(err); } int mlx5_ib_destroy_cq(struct ib_cq *cq) { struct mlx5_ib_dev *dev = to_mdev(cq->device); struct mlx5_ib_cq *mcq = to_mcq(cq); struct ib_ucontext *context = NULL; if (cq->uobject) context = cq->uobject->context; mlx5_core_destroy_cq(dev->mdev, &mcq->mcq); if (context) destroy_cq_user(mcq, context); else destroy_cq_kernel(dev, mcq); kfree(mcq); return 0; } static int is_equal_rsn(struct mlx5_cqe64 *cqe64, u32 rsn) { return rsn == (ntohl(cqe64->sop_drop_qpn) & 0xffffff); } void __mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 rsn, struct mlx5_ib_srq *srq) { struct mlx5_cqe64 *cqe64, *dest64; void *cqe, *dest; u32 prod_index; int nfreed = 0; u8 owner_bit; if (!cq) return; /* First we need to find the current producer index, so we * know where to start cleaning from. It doesn't matter if HW * adds new entries after this loop -- the QP we're worried * about is already in RESET, so the new entries won't come * from our QP and therefore don't need to be checked. */ for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); prod_index++) if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe) break; /* Now sweep backwards through the CQ, removing CQ entries * that match our QP by copying older entries on top of them. */ while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) { cqe = get_cqe(cq, prod_index & cq->ibcq.cqe); cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64; if (is_equal_rsn(cqe64, rsn)) { if (srq && (ntohl(cqe64->srqn) & 0xffffff)) mlx5_ib_free_srq_wqe(srq, be16_to_cpu(cqe64->wqe_counter)); ++nfreed; } else if (nfreed) { dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe); dest64 = (cq->mcq.cqe_sz == 64) ? dest : dest + 64; owner_bit = dest64->op_own & MLX5_CQE_OWNER_MASK; memcpy(dest, cqe, cq->mcq.cqe_sz); dest64->op_own = owner_bit | (dest64->op_own & ~MLX5_CQE_OWNER_MASK); } } if (nfreed) { cq->mcq.cons_index += nfreed; /* Make sure update of buffer contents is done before * updating consumer index. */ wmb(); mlx5_cq_set_ci(&cq->mcq); } } void mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 qpn, struct mlx5_ib_srq *srq) { if (!cq) return; spin_lock_irq(&cq->lock); __mlx5_ib_cq_clean(cq, qpn, srq); spin_unlock_irq(&cq->lock); } int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period) { struct mlx5_ib_dev *dev = to_mdev(cq->device); struct mlx5_ib_cq *mcq = to_mcq(cq); int err; if (!MLX5_CAP_GEN(dev->mdev, cq_moderation)) return -ENOSYS; if (cq_period > MLX5_MAX_CQ_PERIOD) return -EINVAL; err = mlx5_core_modify_cq_moderation(dev->mdev, &mcq->mcq, cq_period, cq_count); if (err) mlx5_ib_warn(dev, "modify cq 0x%x failed\n", mcq->mcq.cqn); return err; } static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq, int entries, struct ib_udata *udata, int *npas, int *page_shift, int *cqe_size) { struct mlx5_ib_resize_cq ucmd; struct ib_umem *umem; int err; int npages; struct ib_ucontext *context = cq->buf.umem->context; err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)); if (err) return err; if (ucmd.reserved0 || ucmd.reserved1) return -EINVAL; /* check multiplication overflow */ if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1) return -EINVAL; umem = ib_umem_get(context, ucmd.buf_addr, (size_t)ucmd.cqe_size * entries, IB_ACCESS_LOCAL_WRITE, 1); if (IS_ERR(umem)) { err = PTR_ERR(umem); return err; } mlx5_ib_cont_pages(umem, ucmd.buf_addr, 0, &npages, page_shift, npas, NULL); cq->resize_umem = umem; *cqe_size = ucmd.cqe_size; return 0; } static void un_resize_user(struct mlx5_ib_cq *cq) { ib_umem_release(cq->resize_umem); } static int resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq, int entries, int cqe_size) { int err; cq->resize_buf = kzalloc(sizeof(*cq->resize_buf), GFP_KERNEL); if (!cq->resize_buf) return -ENOMEM; err = alloc_cq_frag_buf(dev, cq->resize_buf, entries, cqe_size); if (err) goto ex; init_cq_frag_buf(cq, cq->resize_buf); return 0; ex: kfree(cq->resize_buf); return err; } static void un_resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq) { free_cq_buf(dev, cq->resize_buf); cq->resize_buf = NULL; } static int copy_resize_cqes(struct mlx5_ib_cq *cq) { struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device); struct mlx5_cqe64 *scqe64; struct mlx5_cqe64 *dcqe64; void *start_cqe; void *scqe; void *dcqe; int ssize; int dsize; int i; u8 sw_own; ssize = cq->buf.cqe_size; dsize = cq->resize_buf->cqe_size; if (ssize != dsize) { mlx5_ib_warn(dev, "resize from different cqe size is not supported\n"); return -EINVAL; } i = cq->mcq.cons_index; scqe = get_sw_cqe(cq, i); scqe64 = ssize == 64 ? scqe : scqe + 64; start_cqe = scqe; if (!scqe) { mlx5_ib_warn(dev, "expected cqe in sw ownership\n"); return -EINVAL; } while ((scqe64->op_own >> 4) != MLX5_CQE_RESIZE_CQ) { dcqe = mlx5_frag_buf_get_wqe(&cq->resize_buf->fbc, (i + 1) & cq->resize_buf->nent); dcqe64 = dsize == 64 ? dcqe : dcqe + 64; sw_own = sw_ownership_bit(i + 1, cq->resize_buf->nent); memcpy(dcqe, scqe, dsize); dcqe64->op_own = (dcqe64->op_own & ~MLX5_CQE_OWNER_MASK) | sw_own; ++i; scqe = get_sw_cqe(cq, i); scqe64 = ssize == 64 ? scqe : scqe + 64; if (!scqe) { mlx5_ib_warn(dev, "expected cqe in sw ownership\n"); return -EINVAL; } if (scqe == start_cqe) { pr_warn("resize CQ failed to get resize CQE, CQN 0x%x\n", cq->mcq.cqn); return -ENOMEM; } } ++cq->mcq.cons_index; return 0; } int mlx5_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata) { struct mlx5_ib_dev *dev = to_mdev(ibcq->device); struct mlx5_ib_cq *cq = to_mcq(ibcq); void *cqc; u32 *in; int err; int npas; __be64 *pas; int page_shift; int inlen; int uninitialized_var(cqe_size); unsigned long flags; if (!MLX5_CAP_GEN(dev->mdev, cq_resize)) { pr_info("Firmware does not support resize CQ\n"); return -ENOSYS; } if (entries < 1 || entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))) { mlx5_ib_warn(dev, "wrong entries number %d, max %d\n", entries, 1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)); return -EINVAL; } entries = roundup_pow_of_two(entries + 1); if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)) + 1) return -EINVAL; if (entries == ibcq->cqe + 1) return 0; mutex_lock(&cq->resize_mutex); if (udata) { err = resize_user(dev, cq, entries, udata, &npas, &page_shift, &cqe_size); } else { cqe_size = 64; err = resize_kernel(dev, cq, entries, cqe_size); if (!err) { struct mlx5_frag_buf_ctrl *c; c = &cq->resize_buf->fbc; npas = c->frag_buf.npages; page_shift = c->frag_buf.page_shift; } } if (err) goto ex; inlen = MLX5_ST_SZ_BYTES(modify_cq_in) + MLX5_FLD_SZ_BYTES(modify_cq_in, pas[0]) * npas; in = kvzalloc(inlen, GFP_KERNEL); if (!in) { err = -ENOMEM; goto ex_resize; } pas = (__be64 *)MLX5_ADDR_OF(modify_cq_in, in, pas); if (udata) mlx5_ib_populate_pas(dev, cq->resize_umem, page_shift, pas, 0); else mlx5_fill_page_frag_array(&cq->resize_buf->fbc.frag_buf, pas); MLX5_SET(modify_cq_in, in, modify_field_select_resize_field_select.resize_field_select.resize_field_select, MLX5_MODIFY_CQ_MASK_LOG_SIZE | MLX5_MODIFY_CQ_MASK_PG_OFFSET | MLX5_MODIFY_CQ_MASK_PG_SIZE); cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context); MLX5_SET(cqc, cqc, log_page_size, page_shift - MLX5_ADAPTER_PAGE_SHIFT); MLX5_SET(cqc, cqc, cqe_sz, cqe_sz_to_mlx_sz(cqe_size, cq->private_flags & MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD)); MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries)); MLX5_SET(modify_cq_in, in, op_mod, MLX5_CQ_OPMOD_RESIZE); MLX5_SET(modify_cq_in, in, cqn, cq->mcq.cqn); err = mlx5_core_modify_cq(dev->mdev, &cq->mcq, in, inlen); if (err) goto ex_alloc; if (udata) { cq->ibcq.cqe = entries - 1; ib_umem_release(cq->buf.umem); cq->buf.umem = cq->resize_umem; cq->resize_umem = NULL; } else { struct mlx5_ib_cq_buf tbuf; int resized = 0; spin_lock_irqsave(&cq->lock, flags); if (cq->resize_buf) { err = copy_resize_cqes(cq); if (!err) { tbuf = cq->buf; cq->buf = *cq->resize_buf; kfree(cq->resize_buf); cq->resize_buf = NULL; resized = 1; } } cq->ibcq.cqe = entries - 1; spin_unlock_irqrestore(&cq->lock, flags); if (resized) free_cq_buf(dev, &tbuf); } mutex_unlock(&cq->resize_mutex); kvfree(in); return 0; ex_alloc: kvfree(in); ex_resize: if (udata) un_resize_user(cq); else un_resize_kernel(dev, cq); ex: mutex_unlock(&cq->resize_mutex); return err; } int mlx5_ib_get_cqe_size(struct mlx5_ib_dev *dev, struct ib_cq *ibcq) { struct mlx5_ib_cq *cq; if (!ibcq) return 128; cq = to_mcq(ibcq); return cq->cqe_size; } /* Called from atomic context */ int mlx5_ib_generate_wc(struct ib_cq *ibcq, struct ib_wc *wc) { struct mlx5_ib_wc *soft_wc; struct mlx5_ib_cq *cq = to_mcq(ibcq); unsigned long flags; soft_wc = kmalloc(sizeof(*soft_wc), GFP_ATOMIC); if (!soft_wc) return -ENOMEM; soft_wc->wc = *wc; spin_lock_irqsave(&cq->lock, flags); list_add_tail(&soft_wc->list, &cq->wc_list); if (cq->notify_flags == IB_CQ_NEXT_COMP || wc->status != IB_WC_SUCCESS) { cq->notify_flags = 0; schedule_work(&cq->notify_work); } spin_unlock_irqrestore(&cq->lock, flags); return 0; }