/* * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. * Copyright (c) 2005, 2006 PathScale, 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 #include #include "qib.h" #include "qib_mad.h" /* * Validate a RWQE and fill in the SGE state. * Return 1 if OK. */ static int qib_init_sge(struct rvt_qp *qp, struct rvt_rwqe *wqe) { int i, j, ret; struct ib_wc wc; struct rvt_lkey_table *rkt; struct rvt_pd *pd; struct rvt_sge_state *ss; rkt = &to_idev(qp->ibqp.device)->rdi.lkey_table; pd = ibpd_to_rvtpd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); ss = &qp->r_sge; ss->sg_list = qp->r_sg_list; qp->r_len = 0; for (i = j = 0; i < wqe->num_sge; i++) { if (wqe->sg_list[i].length == 0) continue; /* Check LKEY */ ret = rvt_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, NULL, &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE); if (unlikely(ret <= 0)) goto bad_lkey; qp->r_len += wqe->sg_list[i].length; j++; } ss->num_sge = j; ss->total_len = qp->r_len; ret = 1; goto bail; bad_lkey: while (j) { struct rvt_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; rvt_put_mr(sge->mr); } ss->num_sge = 0; memset(&wc, 0, sizeof(wc)); wc.wr_id = wqe->wr_id; wc.status = IB_WC_LOC_PROT_ERR; wc.opcode = IB_WC_RECV; wc.qp = &qp->ibqp; /* Signal solicited completion event. */ rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 1); ret = 0; bail: return ret; } /** * qib_get_rwqe - copy the next RWQE into the QP's RWQE * @qp: the QP * @wr_id_only: update qp->r_wr_id only, not qp->r_sge * * Return -1 if there is a local error, 0 if no RWQE is available, * otherwise return 1. * * Can be called from interrupt level. */ int qib_get_rwqe(struct rvt_qp *qp, int wr_id_only) { unsigned long flags; struct rvt_rq *rq; struct rvt_rwq *wq; struct rvt_srq *srq; struct rvt_rwqe *wqe; void (*handler)(struct ib_event *, void *); u32 tail; int ret; if (qp->ibqp.srq) { srq = ibsrq_to_rvtsrq(qp->ibqp.srq); handler = srq->ibsrq.event_handler; rq = &srq->rq; } else { srq = NULL; handler = NULL; rq = &qp->r_rq; } spin_lock_irqsave(&rq->lock, flags); if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { ret = 0; goto unlock; } wq = rq->wq; tail = wq->tail; /* Validate tail before using it since it is user writable. */ if (tail >= rq->size) tail = 0; if (unlikely(tail == wq->head)) { ret = 0; goto unlock; } /* Make sure entry is read after head index is read. */ smp_rmb(); wqe = rvt_get_rwqe_ptr(rq, tail); /* * Even though we update the tail index in memory, the verbs * consumer is not supposed to post more entries until a * completion is generated. */ if (++tail >= rq->size) tail = 0; wq->tail = tail; if (!wr_id_only && !qib_init_sge(qp, wqe)) { ret = -1; goto unlock; } qp->r_wr_id = wqe->wr_id; ret = 1; set_bit(RVT_R_WRID_VALID, &qp->r_aflags); if (handler) { u32 n; /* * Validate head pointer value and compute * the number of remaining WQEs. */ n = wq->head; if (n >= rq->size) n = 0; if (n < tail) n += rq->size - tail; else n -= tail; if (n < srq->limit) { struct ib_event ev; srq->limit = 0; spin_unlock_irqrestore(&rq->lock, flags); ev.device = qp->ibqp.device; ev.element.srq = qp->ibqp.srq; ev.event = IB_EVENT_SRQ_LIMIT_REACHED; handler(&ev, srq->ibsrq.srq_context); goto bail; } } unlock: spin_unlock_irqrestore(&rq->lock, flags); bail: return ret; } /* * Switch to alternate path. * The QP s_lock should be held and interrupts disabled. */ void qib_migrate_qp(struct rvt_qp *qp) { struct ib_event ev; qp->s_mig_state = IB_MIG_MIGRATED; qp->remote_ah_attr = qp->alt_ah_attr; qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr); qp->s_pkey_index = qp->s_alt_pkey_index; ev.device = qp->ibqp.device; ev.element.qp = &qp->ibqp; ev.event = IB_EVENT_PATH_MIG; qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); } static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) { if (!index) { struct qib_pportdata *ppd = ppd_from_ibp(ibp); return ppd->guid; } return ibp->guids[index - 1]; } static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) { return (gid->global.interface_id == id && (gid->global.subnet_prefix == gid_prefix || gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); } /* * * This should be called with the QP r_lock held. * * The s_lock will be acquired around the qib_migrate_qp() call. */ int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr, int has_grh, struct rvt_qp *qp, u32 bth0) { __be64 guid; unsigned long flags; if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { if (!has_grh) { if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH) goto err; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH)) goto err; grh = rdma_ah_read_grh(&qp->alt_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, guid)) goto err; if (!gid_ok(&hdr->u.l.grh.sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) goto err; } if (!qib_pkey_ok((u16)bth0, qib_get_pkey(ibp, qp->s_alt_pkey_index))) { qib_bad_pkey(ibp, (u16)bth0, (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 0, qp->ibqp.qp_num, hdr->lrh[3], hdr->lrh[1]); goto err; } /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ if ((be16_to_cpu(hdr->lrh[3]) != rdma_ah_get_dlid(&qp->alt_ah_attr)) || ppd_from_ibp(ibp)->port != rdma_ah_get_port_num(&qp->alt_ah_attr)) goto err; spin_lock_irqsave(&qp->s_lock, flags); qib_migrate_qp(qp); spin_unlock_irqrestore(&qp->s_lock, flags); } else { if (!has_grh) { if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) goto err; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) goto err; grh = rdma_ah_read_grh(&qp->remote_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, guid)) goto err; if (!gid_ok(&hdr->u.l.grh.sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) goto err; } if (!qib_pkey_ok((u16)bth0, qib_get_pkey(ibp, qp->s_pkey_index))) { qib_bad_pkey(ibp, (u16)bth0, (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 0, qp->ibqp.qp_num, hdr->lrh[3], hdr->lrh[1]); goto err; } /* Validate the SLID. See Ch. 9.6.1.5 */ if (be16_to_cpu(hdr->lrh[3]) != rdma_ah_get_dlid(&qp->remote_ah_attr) || ppd_from_ibp(ibp)->port != qp->port_num) goto err; if (qp->s_mig_state == IB_MIG_REARM && !(bth0 & IB_BTH_MIG_REQ)) qp->s_mig_state = IB_MIG_ARMED; } return 0; err: return 1; } /** * qib_ruc_loopback - handle UC and RC lookback requests * @sqp: the sending QP * * This is called from qib_do_send() to * forward a WQE addressed to the same HCA. * Note that although we are single threaded due to the tasklet, we still * have to protect against post_send(). We don't have to worry about * receive interrupts since this is a connected protocol and all packets * will pass through here. */ static void qib_ruc_loopback(struct rvt_qp *sqp) { struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); struct qib_pportdata *ppd = ppd_from_ibp(ibp); struct qib_devdata *dd = ppd->dd; struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; struct rvt_qp *qp; struct rvt_swqe *wqe; struct rvt_sge *sge; unsigned long flags; struct ib_wc wc; u64 sdata; atomic64_t *maddr; enum ib_wc_status send_status; int release; int ret; rcu_read_lock(); /* * Note that we check the responder QP state after * checking the requester's state. */ qp = rvt_lookup_qpn(rdi, &ibp->rvp, sqp->remote_qpn); if (!qp) goto done; spin_lock_irqsave(&sqp->s_lock, flags); /* Return if we are already busy processing a work request. */ if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) || !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) goto unlock; sqp->s_flags |= RVT_S_BUSY; again: smp_read_barrier_depends(); /* see post_one_send() */ if (sqp->s_last == ACCESS_ONCE(sqp->s_head)) goto clr_busy; wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); /* Return if it is not OK to start a new work reqeust. */ if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) goto clr_busy; /* We are in the error state, flush the work request. */ send_status = IB_WC_WR_FLUSH_ERR; goto flush_send; } /* * We can rely on the entry not changing without the s_lock * being held until we update s_last. * We increment s_cur to indicate s_last is in progress. */ if (sqp->s_last == sqp->s_cur) { if (++sqp->s_cur >= sqp->s_size) sqp->s_cur = 0; } spin_unlock_irqrestore(&sqp->s_lock, flags); if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || qp->ibqp.qp_type != sqp->ibqp.qp_type) { ibp->rvp.n_pkt_drops++; /* * For RC, the requester would timeout and retry so * shortcut the timeouts and just signal too many retries. */ if (sqp->ibqp.qp_type == IB_QPT_RC) send_status = IB_WC_RETRY_EXC_ERR; else send_status = IB_WC_SUCCESS; goto serr; } memset(&wc, 0, sizeof(wc)); send_status = IB_WC_SUCCESS; release = 1; sqp->s_sge.sge = wqe->sg_list[0]; sqp->s_sge.sg_list = wqe->sg_list + 1; sqp->s_sge.num_sge = wqe->wr.num_sge; sqp->s_len = wqe->length; switch (wqe->wr.opcode) { case IB_WR_SEND_WITH_IMM: wc.wc_flags = IB_WC_WITH_IMM; wc.ex.imm_data = wqe->wr.ex.imm_data; /* FALLTHROUGH */ case IB_WR_SEND: ret = qib_get_rwqe(qp, 0); if (ret < 0) goto op_err; if (!ret) goto rnr_nak; if (wqe->length > qp->r_len) goto inv_err; break; case IB_WR_RDMA_WRITE_WITH_IMM: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) goto inv_err; wc.wc_flags = IB_WC_WITH_IMM; wc.ex.imm_data = wqe->wr.ex.imm_data; ret = qib_get_rwqe(qp, 1); if (ret < 0) goto op_err; if (!ret) goto rnr_nak; /* FALLTHROUGH */ case IB_WR_RDMA_WRITE: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) goto inv_err; if (wqe->length == 0) break; if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, wqe->rdma_wr.remote_addr, wqe->rdma_wr.rkey, IB_ACCESS_REMOTE_WRITE))) goto acc_err; qp->r_sge.sg_list = NULL; qp->r_sge.num_sge = 1; qp->r_sge.total_len = wqe->length; break; case IB_WR_RDMA_READ: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) goto inv_err; if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, wqe->rdma_wr.remote_addr, wqe->rdma_wr.rkey, IB_ACCESS_REMOTE_READ))) goto acc_err; release = 0; sqp->s_sge.sg_list = NULL; sqp->s_sge.num_sge = 1; qp->r_sge.sge = wqe->sg_list[0]; qp->r_sge.sg_list = wqe->sg_list + 1; qp->r_sge.num_sge = wqe->wr.num_sge; qp->r_sge.total_len = wqe->length; break; case IB_WR_ATOMIC_CMP_AND_SWP: case IB_WR_ATOMIC_FETCH_AND_ADD: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) goto inv_err; if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), wqe->atomic_wr.remote_addr, wqe->atomic_wr.rkey, IB_ACCESS_REMOTE_ATOMIC))) goto acc_err; /* Perform atomic OP and save result. */ maddr = (atomic64_t *) qp->r_sge.sge.vaddr; sdata = wqe->atomic_wr.compare_add; *(u64 *) sqp->s_sge.sge.vaddr = (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? (u64) atomic64_add_return(sdata, maddr) - sdata : (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, sdata, wqe->atomic_wr.swap); rvt_put_mr(qp->r_sge.sge.mr); qp->r_sge.num_sge = 0; goto send_comp; default: send_status = IB_WC_LOC_QP_OP_ERR; goto serr; } sge = &sqp->s_sge.sge; while (sqp->s_len) { u32 len = sqp->s_len; if (len > sge->length) len = sge->length; if (len > sge->sge_length) len = sge->sge_length; BUG_ON(len == 0); qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); sge->vaddr += len; sge->length -= len; sge->sge_length -= len; if (sge->sge_length == 0) { if (!release) rvt_put_mr(sge->mr); if (--sqp->s_sge.num_sge) *sge = *sqp->s_sge.sg_list++; } else if (sge->length == 0 && sge->mr->lkey) { if (++sge->n >= RVT_SEGSZ) { if (++sge->m >= sge->mr->mapsz) break; sge->n = 0; } sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr; sge->length = sge->mr->map[sge->m]->segs[sge->n].length; } sqp->s_len -= len; } if (release) rvt_put_ss(&qp->r_sge); if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) goto send_comp; if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; else wc.opcode = IB_WC_RECV; wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.byte_len = wqe->length; wc.qp = &qp->ibqp; wc.src_qp = qp->remote_qpn; wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr); wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); wc.port_num = 1; /* Signal completion event if the solicited bit is set. */ rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, wqe->wr.send_flags & IB_SEND_SOLICITED); send_comp: spin_lock_irqsave(&sqp->s_lock, flags); ibp->rvp.n_loop_pkts++; flush_send: sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; qib_send_complete(sqp, wqe, send_status); goto again; rnr_nak: /* Handle RNR NAK */ if (qp->ibqp.qp_type == IB_QPT_UC) goto send_comp; ibp->rvp.n_rnr_naks++; /* * Note: we don't need the s_lock held since the BUSY flag * makes this single threaded. */ if (sqp->s_rnr_retry == 0) { send_status = IB_WC_RNR_RETRY_EXC_ERR; goto serr; } if (sqp->s_rnr_retry_cnt < 7) sqp->s_rnr_retry--; spin_lock_irqsave(&sqp->s_lock, flags); if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) goto clr_busy; rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer << IB_AETH_CREDIT_SHIFT); goto clr_busy; op_err: send_status = IB_WC_REM_OP_ERR; wc.status = IB_WC_LOC_QP_OP_ERR; goto err; inv_err: send_status = sqp->ibqp.qp_type == IB_QPT_RC ? IB_WC_REM_INV_REQ_ERR : IB_WC_SUCCESS; wc.status = IB_WC_LOC_QP_OP_ERR; goto err; acc_err: send_status = IB_WC_REM_ACCESS_ERR; wc.status = IB_WC_LOC_PROT_ERR; err: /* responder goes to error state */ rvt_rc_error(qp, wc.status); serr: spin_lock_irqsave(&sqp->s_lock, flags); qib_send_complete(sqp, wqe, send_status); if (sqp->ibqp.qp_type == IB_QPT_RC) { int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); sqp->s_flags &= ~RVT_S_BUSY; spin_unlock_irqrestore(&sqp->s_lock, flags); if (lastwqe) { struct ib_event ev; ev.device = sqp->ibqp.device; ev.element.qp = &sqp->ibqp; ev.event = IB_EVENT_QP_LAST_WQE_REACHED; sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); } goto done; } clr_busy: sqp->s_flags &= ~RVT_S_BUSY; unlock: spin_unlock_irqrestore(&sqp->s_lock, flags); done: rcu_read_unlock(); } /** * qib_make_grh - construct a GRH header * @ibp: a pointer to the IB port * @hdr: a pointer to the GRH header being constructed * @grh: the global route address to send to * @hwords: the number of 32 bit words of header being sent * @nwords: the number of 32 bit words of data being sent * * Return the size of the header in 32 bit words. */ u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, const struct ib_global_route *grh, u32 hwords, u32 nwords) { hdr->version_tclass_flow = cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | (grh->flow_label << IB_GRH_FLOW_SHIFT)); hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); /* next_hdr is defined by C8-7 in ch. 8.4.1 */ hdr->next_hdr = IB_GRH_NEXT_HDR; hdr->hop_limit = grh->hop_limit; /* The SGID is 32-bit aligned. */ hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; if (!grh->sgid_index) hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid; else if (grh->sgid_index < QIB_GUIDS_PER_PORT) hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1]; hdr->dgid = grh->dgid; /* GRH header size in 32-bit words. */ return sizeof(struct ib_grh) / sizeof(u32); } void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2) { struct qib_qp_priv *priv = qp->priv; struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); u16 lrh0; u32 nwords; u32 extra_bytes; /* Construct the header. */ extra_bytes = -qp->s_cur_size & 3; nwords = (qp->s_cur_size + extra_bytes) >> 2; lrh0 = QIB_LRH_BTH; if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, rdma_ah_read_grh(&qp->remote_ah_attr), qp->s_hdrwords, nwords); lrh0 = QIB_LRH_GRH; } lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 | rdma_ah_get_sl(&qp->remote_ah_attr) << 4; priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); priv->s_hdr->lrh[1] = cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr)); priv->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); priv->s_hdr->lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr)); bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); bth0 |= extra_bytes << 20; if (qp->s_mig_state == IB_MIG_MIGRATED) bth0 |= IB_BTH_MIG_REQ; ohdr->bth[0] = cpu_to_be32(bth0); ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); ohdr->bth[2] = cpu_to_be32(bth2); this_cpu_inc(ibp->pmastats->n_unicast_xmit); } void _qib_do_send(struct work_struct *work) { struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv, s_work); struct rvt_qp *qp = priv->owner; qib_do_send(qp); } /** * qib_do_send - perform a send on a QP * @qp: pointer to the QP * * Process entries in the send work queue until credit or queue is * exhausted. Only allow one CPU to send a packet per QP (tasklet). * Otherwise, two threads could send packets out of order. */ void qib_do_send(struct rvt_qp *qp) { struct qib_qp_priv *priv = qp->priv; struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); struct qib_pportdata *ppd = ppd_from_ibp(ibp); int (*make_req)(struct rvt_qp *qp, unsigned long *flags); unsigned long flags; if ((qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) && (rdma_ah_get_dlid(&qp->remote_ah_attr) & ~((1 << ppd->lmc) - 1)) == ppd->lid) { qib_ruc_loopback(qp); return; } if (qp->ibqp.qp_type == IB_QPT_RC) make_req = qib_make_rc_req; else if (qp->ibqp.qp_type == IB_QPT_UC) make_req = qib_make_uc_req; else make_req = qib_make_ud_req; spin_lock_irqsave(&qp->s_lock, flags); /* Return if we are already busy processing a work request. */ if (!qib_send_ok(qp)) { spin_unlock_irqrestore(&qp->s_lock, flags); return; } qp->s_flags |= RVT_S_BUSY; do { /* Check for a constructed packet to be sent. */ if (qp->s_hdrwords != 0) { spin_unlock_irqrestore(&qp->s_lock, flags); /* * If the packet cannot be sent now, return and * the send tasklet will be woken up later. */ if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords, qp->s_cur_sge, qp->s_cur_size)) return; /* Record that s_hdr is empty. */ qp->s_hdrwords = 0; spin_lock_irqsave(&qp->s_lock, flags); } } while (make_req(qp, &flags)); spin_unlock_irqrestore(&qp->s_lock, flags); } /* * This should be called with s_lock held. */ void qib_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, enum ib_wc_status status) { u32 old_last, last; if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) return; last = qp->s_last; old_last = last; if (++last >= qp->s_size) last = 0; qp->s_last = last; /* See post_send() */ barrier(); rvt_put_swqe(wqe); if (qp->ibqp.qp_type == IB_QPT_UD || qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); rvt_qp_swqe_complete(qp, wqe, ib_qib_wc_opcode[wqe->wr.opcode], status); if (qp->s_acked == old_last) qp->s_acked = last; if (qp->s_cur == old_last) qp->s_cur = last; if (qp->s_tail == old_last) qp->s_tail = last; if (qp->state == IB_QPS_SQD && last == qp->s_cur) qp->s_draining = 0; }