/* * Copyright(c) 2015 - 2018 Intel Corporation. * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * 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. * - Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include #include "hfi.h" #include "mad.h" #include "qp.h" #include "verbs_txreq.h" #include "trace.h" 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 hfi1_migrate_qp() call. */ int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet) { __be64 guid; unsigned long flags; struct rvt_qp *qp = packet->qp; u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)]; u32 dlid = packet->dlid; u32 slid = packet->slid; u32 sl = packet->sl; bool migrated = packet->migrated; u16 pkey = packet->pkey; if (qp->s_mig_state == IB_MIG_ARMED && migrated) { if (!packet->grh) { if ((rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH) && (packet->etype != RHF_RCV_TYPE_BYPASS)) return 1; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH)) return 1; grh = rdma_ah_read_grh(&qp->alt_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, guid)) return 1; if (!gid_ok( &packet->grh->sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) return 1; } if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, sc5, slid))) { hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, slid, dlid); return 1; } /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ if (slid != rdma_ah_get_dlid(&qp->alt_ah_attr) || ppd_from_ibp(ibp)->port != rdma_ah_get_port_num(&qp->alt_ah_attr)) return 1; spin_lock_irqsave(&qp->s_lock, flags); hfi1_migrate_qp(qp); spin_unlock_irqrestore(&qp->s_lock, flags); } else { if (!packet->grh) { if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && (packet->etype != RHF_RCV_TYPE_BYPASS)) return 1; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) return 1; grh = rdma_ah_read_grh(&qp->remote_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, guid)) return 1; if (!gid_ok( &packet->grh->sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) return 1; } if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, sc5, slid))) { hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, slid, dlid); return 1; } /* Validate the SLID. See Ch. 9.6.1.5 */ if ((slid != rdma_ah_get_dlid(&qp->remote_ah_attr)) || ppd_from_ibp(ibp)->port != qp->port_num) return 1; if (qp->s_mig_state == IB_MIG_REARM && !migrated) qp->s_mig_state = IB_MIG_ARMED; } return 0; } /** * ruc_loopback - handle UC and RC loopback requests * @sqp: the sending QP * * This is called from hfi1_do_send() to * forward a WQE addressed to the same HFI. * Note that although we are single threaded due to the send engine, 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 ruc_loopback(struct rvt_qp *sqp) { struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 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; bool release; int ret; bool copy_last = false; int local_ops = 0; rcu_read_lock(); /* * Note that we check the responder QP state after * checking the requester's state. */ qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp, sqp->remote_qpn); spin_lock_irqsave(&sqp->s_lock, flags); /* Return if we are already busy processing a work request. */ if ((sqp->s_flags & (RVT_S_BUSY | HFI1_S_ANY_WAIT)) || !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) goto unlock; sqp->s_flags |= RVT_S_BUSY; again: if (sqp->s_last == READ_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 request. */ 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 = true; 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_REG_MR: goto send_comp; case IB_WR_LOCAL_INV: if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) { if (rvt_invalidate_rkey(sqp, wqe->wr.ex.invalidate_rkey)) send_status = IB_WC_LOC_PROT_ERR; local_ops = 1; } goto send_comp; case IB_WR_SEND_WITH_INV: if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) { wc.wc_flags = IB_WC_WITH_INVALIDATE; wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey; } goto send; 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: send: ret = rvt_get_rwqe(qp, false); 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 = rvt_get_rwqe(qp, true); if (ret < 0) goto op_err; if (!ret) goto rnr_nak; /* skip copy_last set and qp_access_flags recheck */ goto do_write; case IB_WR_RDMA_WRITE: copy_last = rvt_is_user_qp(qp); if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) goto inv_err; do_write: 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 = false; 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->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; WARN_ON_ONCE(len == 0); hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release, copy_last); 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) & U16_MAX; 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; hfi1_send_complete(sqp, wqe, send_status); if (local_ops) { atomic_dec(&sqp->local_ops_pending); local_ops = 0; } 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); hfi1_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(); } /** * hfi1_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: size of header after grh being sent in dwords * @nwords: the number of 32 bit words of data being sent * * Return the size of the header in 32 bit words. */ u32 hfi1_make_grh(struct hfi1_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 + nwords) << 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; hdr->sgid.global.interface_id = grh->sgid_index < HFI1_GUIDS_PER_PORT ? get_sguid(ibp, grh->sgid_index) : get_sguid(ibp, HFI1_PORT_GUID_INDEX); hdr->dgid = grh->dgid; /* GRH header size in 32-bit words. */ return sizeof(struct ib_grh) / sizeof(u32); } #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \ hdr.ibh.u.oth.bth[2]) / 4) /** * build_ahg - create ahg in s_ahg * @qp: a pointer to QP * @npsn: the next PSN for the request/response * * This routine handles the AHG by allocating an ahg entry and causing the * copy of the first middle. * * Subsequent middles use the copied entry, editing the * PSN with 1 or 2 edits. */ static inline void build_ahg(struct rvt_qp *qp, u32 npsn) { struct hfi1_qp_priv *priv = qp->priv; if (unlikely(qp->s_flags & HFI1_S_AHG_CLEAR)) clear_ahg(qp); if (!(qp->s_flags & HFI1_S_AHG_VALID)) { /* first middle that needs copy */ if (qp->s_ahgidx < 0) qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde); if (qp->s_ahgidx >= 0) { qp->s_ahgpsn = npsn; priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY; /* save to protect a change in another thread */ priv->s_ahg->ahgidx = qp->s_ahgidx; qp->s_flags |= HFI1_S_AHG_VALID; } } else { /* subsequent middle after valid */ if (qp->s_ahgidx >= 0) { priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG; priv->s_ahg->ahgidx = qp->s_ahgidx; priv->s_ahg->ahgcount++; priv->s_ahg->ahgdesc[0] = sdma_build_ahg_descriptor( (__force u16)cpu_to_be16((u16)npsn), BTH2_OFFSET, 16, 16); if ((npsn & 0xffff0000) != (qp->s_ahgpsn & 0xffff0000)) { priv->s_ahg->ahgcount++; priv->s_ahg->ahgdesc[1] = sdma_build_ahg_descriptor( (__force u16)cpu_to_be16( (u16)(npsn >> 16)), BTH2_OFFSET, 0, 16); } } } } static inline void hfi1_make_ruc_bth(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth1, u32 bth2) { bth1 |= qp->remote_qpn; ohdr->bth[0] = cpu_to_be32(bth0); ohdr->bth[1] = cpu_to_be32(bth1); ohdr->bth[2] = cpu_to_be32(bth2); } /** * hfi1_make_ruc_header_16B - build a 16B header * @qp: the queue pair * @ohdr: a pointer to the destination header memory * @bth0: bth0 passed in from the RC/UC builder * @bth2: bth2 passed in from the RC/UC builder * @middle: non zero implies indicates ahg "could" be used * @ps: the current packet state * * This routine may disarm ahg under these situations: * - packet needs a GRH * - BECN needed * - migration state not IB_MIG_MIGRATED */ static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2, int middle, struct hfi1_pkt_state *ps) { struct hfi1_qp_priv *priv = qp->priv; struct hfi1_ibport *ibp = ps->ibp; struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); u32 bth1 = 0; u32 slid; u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); u8 l4 = OPA_16B_L4_IB_LOCAL; u8 extra_bytes = hfi1_get_16b_padding( (ps->s_txreq->hdr_dwords << 2), ps->s_txreq->s_cur_size); u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + extra_bytes + SIZE_OF_LT) >> 2); bool becn = false; if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { struct ib_grh *grh; struct ib_global_route *grd = rdma_ah_retrieve_grh(&qp->remote_ah_attr); /* * Ensure OPA GIDs are transformed to IB gids * before creating the GRH. */ if (grd->sgid_index == OPA_GID_INDEX) grd->sgid_index = 0; grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; l4 = OPA_16B_L4_IB_GLOBAL; ps->s_txreq->hdr_dwords += hfi1_make_grh(ibp, grh, grd, ps->s_txreq->hdr_dwords - LRH_16B_DWORDS, nwords); middle = 0; } if (qp->s_mig_state == IB_MIG_MIGRATED) bth1 |= OPA_BTH_MIG_REQ; else middle = 0; if (qp->s_flags & RVT_S_ECN) { qp->s_flags &= ~RVT_S_ECN; /* we recently received a FECN, so return a BECN */ becn = true; middle = 0; } if (middle) build_ahg(qp, bth2); else qp->s_flags &= ~HFI1_S_AHG_VALID; bth0 |= pkey; bth0 |= extra_bytes << 20; hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); if (!ppd->lid) slid = be32_to_cpu(OPA_LID_PERMISSIVE); else slid = ppd->lid | (rdma_ah_get_path_bits(&qp->remote_ah_attr) & ((1 << ppd->lmc) - 1)); hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, slid, opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 16B), (ps->s_txreq->hdr_dwords + nwords) >> 1, pkey, becn, 0, l4, priv->s_sc); } /** * hfi1_make_ruc_header_9B - build a 9B header * @qp: the queue pair * @ohdr: a pointer to the destination header memory * @bth0: bth0 passed in from the RC/UC builder * @bth2: bth2 passed in from the RC/UC builder * @middle: non zero implies indicates ahg "could" be used * @ps: the current packet state * * This routine may disarm ahg under these situations: * - packet needs a GRH * - BECN needed * - migration state not IB_MIG_MIGRATED */ static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2, int middle, struct hfi1_pkt_state *ps) { struct hfi1_qp_priv *priv = qp->priv; struct hfi1_ibport *ibp = ps->ibp; u32 bth1 = 0; u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); u16 lrh0 = HFI1_LRH_BTH; u8 extra_bytes = -ps->s_txreq->s_cur_size & 3; u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + extra_bytes) >> 2); if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; lrh0 = HFI1_LRH_GRH; ps->s_txreq->hdr_dwords += hfi1_make_grh(ibp, grh, rdma_ah_read_grh(&qp->remote_ah_attr), ps->s_txreq->hdr_dwords - LRH_9B_DWORDS, nwords); middle = 0; } lrh0 |= (priv->s_sc & 0xf) << 12 | (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4; if (qp->s_mig_state == IB_MIG_MIGRATED) bth0 |= IB_BTH_MIG_REQ; else middle = 0; if (qp->s_flags & RVT_S_ECN) { qp->s_flags &= ~RVT_S_ECN; /* we recently received a FECN, so return a BECN */ bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT); middle = 0; } if (middle) build_ahg(qp, bth2); else qp->s_flags &= ~HFI1_S_AHG_VALID; bth0 |= pkey; bth0 |= extra_bytes << 20; hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, lrh0, ps->s_txreq->hdr_dwords + nwords, opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), ppd_from_ibp(ibp)->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr)); } typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2, int middle, struct hfi1_pkt_state *ps); /* We support only two types - 9B and 16B for now */ static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = { [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B, [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B }; void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2, int middle, struct hfi1_pkt_state *ps) { struct hfi1_qp_priv *priv = qp->priv; /* * reset s_ahg/AHG fields * * This insures that the ahgentry/ahgcount * are at a non-AHG default to protect * build_verbs_tx_desc() from using * an include ahgidx. * * build_ahg() will modify as appropriate * to use the AHG feature. */ priv->s_ahg->tx_flags = 0; priv->s_ahg->ahgcount = 0; priv->s_ahg->ahgidx = 0; /* Make the appropriate header */ hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth2, middle, ps); } /* when sending, force a reschedule every one of these periods */ #define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */ /** * schedule_send_yield - test for a yield required for QP send engine * @timeout: Final time for timeout slice for jiffies * @qp: a pointer to QP * @ps: a pointer to a structure with commonly lookup values for * the the send engine progress * * This routine checks if the time slice for the QP has expired * for RC QPs, if so an additional work entry is queued. At this * point, other QPs have an opportunity to be scheduled. It * returns true if a yield is required, otherwise, false * is returned. */ static bool schedule_send_yield(struct rvt_qp *qp, struct hfi1_pkt_state *ps) { ps->pkts_sent = true; if (unlikely(time_after(jiffies, ps->timeout))) { if (!ps->in_thread || workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) { spin_lock_irqsave(&qp->s_lock, ps->flags); qp->s_flags &= ~RVT_S_BUSY; hfi1_schedule_send(qp); spin_unlock_irqrestore(&qp->s_lock, ps->flags); this_cpu_inc(*ps->ppd->dd->send_schedule); trace_hfi1_rc_expired_time_slice(qp, true); return true; } cond_resched(); this_cpu_inc(*ps->ppd->dd->send_schedule); ps->timeout = jiffies + ps->timeout_int; } trace_hfi1_rc_expired_time_slice(qp, false); return false; } void hfi1_do_send_from_rvt(struct rvt_qp *qp) { hfi1_do_send(qp, false); } void _hfi1_do_send(struct work_struct *work) { struct iowait *wait = container_of(work, struct iowait, iowork); struct rvt_qp *qp = iowait_to_qp(wait); hfi1_do_send(qp, true); } /** * hfi1_do_send - perform a send on a QP * @work: contains a pointer to the QP * @in_thread: true if in a workqueue thread * * Process entries in the send work queue until credit or queue is * exhausted. Only allow one CPU to send a packet per QP. * Otherwise, two threads could send packets out of order. */ void hfi1_do_send(struct rvt_qp *qp, bool in_thread) { struct hfi1_pkt_state ps; struct hfi1_qp_priv *priv = qp->priv; int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); ps.dev = to_idev(qp->ibqp.device); ps.ibp = to_iport(qp->ibqp.device, qp->port_num); ps.ppd = ppd_from_ibp(ps.ibp); ps.in_thread = in_thread; trace_hfi1_rc_do_send(qp, in_thread); switch (qp->ibqp.qp_type) { case IB_QPT_RC: if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & ~((1 << ps.ppd->lmc) - 1)) == ps.ppd->lid)) { ruc_loopback(qp); return; } make_req = hfi1_make_rc_req; ps.timeout_int = qp->timeout_jiffies; break; case IB_QPT_UC: if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & ~((1 << ps.ppd->lmc) - 1)) == ps.ppd->lid)) { ruc_loopback(qp); return; } make_req = hfi1_make_uc_req; ps.timeout_int = SEND_RESCHED_TIMEOUT; break; default: make_req = hfi1_make_ud_req; ps.timeout_int = SEND_RESCHED_TIMEOUT; } spin_lock_irqsave(&qp->s_lock, ps.flags); /* Return if we are already busy processing a work request. */ if (!hfi1_send_ok(qp)) { spin_unlock_irqrestore(&qp->s_lock, ps.flags); return; } qp->s_flags |= RVT_S_BUSY; ps.timeout_int = ps.timeout_int / 8; ps.timeout = jiffies + ps.timeout_int; ps.cpu = priv->s_sde ? priv->s_sde->cpu : cpumask_first(cpumask_of_node(ps.ppd->dd->node)); ps.pkts_sent = false; /* insure a pre-built packet is handled */ ps.s_txreq = get_waiting_verbs_txreq(qp); do { /* Check for a constructed packet to be sent. */ if (ps.s_txreq) { spin_unlock_irqrestore(&qp->s_lock, ps.flags); /* * If the packet cannot be sent now, return and * the send engine will be woken up later. */ if (hfi1_verbs_send(qp, &ps)) return; /* allow other tasks to run */ if (schedule_send_yield(qp, &ps)) return; spin_lock_irqsave(&qp->s_lock, ps.flags); } } while (make_req(qp, &ps)); iowait_starve_clear(ps.pkts_sent, &priv->s_iowait); spin_unlock_irqrestore(&qp->s_lock, ps.flags); } /* * This should be called with s_lock held. */ void hfi1_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; trace_hfi1_qp_send_completion(qp, wqe, last); if (++last >= qp->s_size) last = 0; trace_hfi1_qp_send_completion(qp, wqe, last); 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_hfi1_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; }