/* * 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" /** * qib_ud_loopback - handle send on loopback QPs * @sqp: the sending QP * @swqe: the send work request * * This is called from qib_make_ud_req() to forward a WQE addressed * to the same HCA. * Note that the receive interrupt handler may be calling qib_ud_rcv() * while this is being called. */ static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe) { 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 rdma_ah_attr *ah_attr; unsigned long flags; struct rvt_sge_state ssge; struct rvt_sge *sge; struct ib_wc wc; u32 length; enum ib_qp_type sqptype, dqptype; rcu_read_lock(); qp = rvt_lookup_qpn(rdi, &ibp->rvp, swqe->ud_wr.remote_qpn); if (!qp) { ibp->rvp.n_pkt_drops++; goto drop; } sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ? IB_QPT_UD : sqp->ibqp.qp_type; dqptype = qp->ibqp.qp_type == IB_QPT_GSI ? IB_QPT_UD : qp->ibqp.qp_type; if (dqptype != sqptype || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { ibp->rvp.n_pkt_drops++; goto drop; } ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr; ppd = ppd_from_ibp(ibp); if (qp->ibqp.qp_num > 1) { u16 pkey1; u16 pkey2; u16 lid; pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index); pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & ((1 << ppd->lmc) - 1)); qib_bad_pkey(ibp, pkey1, rdma_ah_get_sl(ah_attr), sqp->ibqp.qp_num, qp->ibqp.qp_num, cpu_to_be16(lid), cpu_to_be16(rdma_ah_get_dlid(ah_attr))); goto drop; } } /* * Check that the qkey matches (except for QP0, see 9.6.1.4.1). * Qkeys with the high order bit set mean use the * qkey from the QP context instead of the WR (see 10.2.5). */ if (qp->ibqp.qp_num) { u32 qkey; qkey = (int)swqe->ud_wr.remote_qkey < 0 ? sqp->qkey : swqe->ud_wr.remote_qkey; if (unlikely(qkey != qp->qkey)) goto drop; } /* * A GRH is expected to precede the data even if not * present on the wire. */ length = swqe->length; memset(&wc, 0, sizeof(wc)); wc.byte_len = length + sizeof(struct ib_grh); if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { wc.wc_flags = IB_WC_WITH_IMM; wc.ex.imm_data = swqe->wr.ex.imm_data; } spin_lock_irqsave(&qp->r_lock, flags); /* * Get the next work request entry to find where to put the data. */ if (qp->r_flags & RVT_R_REUSE_SGE) qp->r_flags &= ~RVT_R_REUSE_SGE; else { int ret; ret = rvt_get_rwqe(qp, false); if (ret < 0) { rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); goto bail_unlock; } if (!ret) { if (qp->ibqp.qp_num == 0) ibp->rvp.n_vl15_dropped++; goto bail_unlock; } } /* Silently drop packets which are too big. */ if (unlikely(wc.byte_len > qp->r_len)) { qp->r_flags |= RVT_R_REUSE_SGE; ibp->rvp.n_pkt_drops++; goto bail_unlock; } if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { struct ib_grh grh; const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr); qib_make_grh(ibp, &grh, grd, 0, 0); rvt_copy_sge(qp, &qp->r_sge, &grh, sizeof(grh), true, false); wc.wc_flags |= IB_WC_GRH; } else rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); ssge.sg_list = swqe->sg_list + 1; ssge.sge = *swqe->sg_list; ssge.num_sge = swqe->wr.num_sge; sge = &ssge.sge; while (length) { u32 len = rvt_get_sge_length(sge, length); rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false); sge->vaddr += len; sge->length -= len; sge->sge_length -= len; if (sge->sge_length == 0) { if (--ssge.num_sge) *sge = *ssge.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; } length -= len; } rvt_put_ss(&qp->r_sge); if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) goto bail_unlock; wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.opcode = IB_WC_RECV; wc.qp = &qp->ibqp; wc.src_qp = sqp->ibqp.qp_num; wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? swqe->ud_wr.pkey_index : 0; wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & ((1 << ppd->lmc) - 1)); wc.sl = rdma_ah_get_sl(ah_attr); wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1); wc.port_num = qp->port_num; /* Signal completion event if the solicited bit is set. */ rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, swqe->wr.send_flags & IB_SEND_SOLICITED); ibp->rvp.n_loop_pkts++; bail_unlock: spin_unlock_irqrestore(&qp->r_lock, flags); drop: rcu_read_unlock(); } /** * qib_make_ud_req - construct a UD request packet * @qp: the QP * * Assumes the s_lock is held. * * Return 1 if constructed; otherwise, return 0. */ int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags) { struct qib_qp_priv *priv = qp->priv; struct ib_other_headers *ohdr; struct rdma_ah_attr *ah_attr; struct qib_pportdata *ppd; struct qib_ibport *ibp; struct rvt_swqe *wqe; u32 nwords; u32 extra_bytes; u32 bth0; u16 lrh0; u16 lid; int ret = 0; int next_cur; if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) goto bail; /* We are in the error state, flush the work request. */ if (qp->s_last == READ_ONCE(qp->s_head)) goto bail; /* If DMAs are in progress, we can't flush immediately. */ if (atomic_read(&priv->s_dma_busy)) { qp->s_flags |= RVT_S_WAIT_DMA; goto bail; } wqe = rvt_get_swqe_ptr(qp, qp->s_last); rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); goto done; } /* see post_one_send() */ if (qp->s_cur == READ_ONCE(qp->s_head)) goto bail; wqe = rvt_get_swqe_ptr(qp, qp->s_cur); next_cur = qp->s_cur + 1; if (next_cur >= qp->s_size) next_cur = 0; /* Construct the header. */ ibp = to_iport(qp->ibqp.device, qp->port_num); ppd = ppd_from_ibp(ibp); ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) { if (rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE)) this_cpu_inc(ibp->pmastats->n_multicast_xmit); else this_cpu_inc(ibp->pmastats->n_unicast_xmit); } else { this_cpu_inc(ibp->pmastats->n_unicast_xmit); lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); if (unlikely(lid == ppd->lid)) { unsigned long tflags = *flags; /* * If DMAs are in progress, we can't generate * a completion for the loopback packet since * it would be out of order. * XXX Instead of waiting, we could queue a * zero length descriptor so we get a callback. */ if (atomic_read(&priv->s_dma_busy)) { qp->s_flags |= RVT_S_WAIT_DMA; goto bail; } qp->s_cur = next_cur; spin_unlock_irqrestore(&qp->s_lock, tflags); qib_ud_loopback(qp, wqe); spin_lock_irqsave(&qp->s_lock, tflags); *flags = tflags; rvt_send_complete(qp, wqe, IB_WC_SUCCESS); goto done; } } qp->s_cur = next_cur; extra_bytes = -wqe->length & 3; nwords = (wqe->length + extra_bytes) >> 2; /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ qp->s_hdrwords = 7; qp->s_cur_size = wqe->length; qp->s_cur_sge = &qp->s_sge; qp->s_srate = rdma_ah_get_static_rate(ah_attr); qp->s_wqe = wqe; qp->s_sge.sge = wqe->sg_list[0]; qp->s_sge.sg_list = wqe->sg_list + 1; qp->s_sge.num_sge = wqe->wr.num_sge; qp->s_sge.total_len = wqe->length; if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { /* Header size in 32-bit words. */ qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, rdma_ah_read_grh(ah_attr), qp->s_hdrwords, nwords); lrh0 = QIB_LRH_GRH; ohdr = &priv->s_hdr->u.l.oth; /* * Don't worry about sending to locally attached multicast * QPs. It is unspecified by the spec. what happens. */ } else { /* Header size in 32-bit words. */ lrh0 = QIB_LRH_BTH; ohdr = &priv->s_hdr->u.oth; } if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { qp->s_hdrwords++; ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; } else bth0 = IB_OPCODE_UD_SEND_ONLY << 24; lrh0 |= rdma_ah_get_sl(ah_attr) << 4; if (qp->ibqp.qp_type == IB_QPT_SMI) lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ else lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12; priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); priv->s_hdr->lrh[1] = cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */ priv->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); lid = ppd->lid; if (lid) { lid |= rdma_ah_get_path_bits(ah_attr) & ((1 << ppd->lmc) - 1); priv->s_hdr->lrh[3] = cpu_to_be16(lid); } else priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE; if (wqe->wr.send_flags & IB_SEND_SOLICITED) bth0 |= IB_BTH_SOLICITED; bth0 |= extra_bytes << 20; bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? wqe->ud_wr.pkey_index : qp->s_pkey_index); ohdr->bth[0] = cpu_to_be32(bth0); /* * Use the multicast QP if the destination LID is a multicast LID. */ ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE) && rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ? cpu_to_be32(QIB_MULTICAST_QPN) : cpu_to_be32(wqe->ud_wr.remote_qpn); ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK); /* * Qkeys with the high order bit set mean use the * qkey from the QP context instead of the WR (see 10.2.5). */ ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ? qp->qkey : wqe->ud_wr.remote_qkey); ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); done: return 1; bail: qp->s_flags &= ~RVT_S_BUSY; return ret; } static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) { struct qib_pportdata *ppd = ppd_from_ibp(ibp); struct qib_devdata *dd = ppd->dd; unsigned ctxt = ppd->hw_pidx; unsigned i; pkey &= 0x7fff; /* remove limited/full membership bit */ for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) return i; /* * Should not get here, this means hardware failed to validate pkeys. * Punt and return index 0. */ return 0; } /** * qib_ud_rcv - receive an incoming UD packet * @ibp: the port the packet came in on * @hdr: the packet header * @has_grh: true if the packet has a GRH * @data: the packet data * @tlen: the packet length * @qp: the QP the packet came on * * This is called from qib_qp_rcv() to process an incoming UD packet * for the given QP. * Called at interrupt level. */ void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr, int has_grh, void *data, u32 tlen, struct rvt_qp *qp) { struct ib_other_headers *ohdr; int opcode; u32 hdrsize; u32 pad; struct ib_wc wc; u32 qkey; u32 src_qp; u16 dlid; /* Check for GRH */ if (!has_grh) { ohdr = &hdr->u.oth; hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ } else { ohdr = &hdr->u.l.oth; hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ } qkey = be32_to_cpu(ohdr->u.ud.deth[0]); src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; /* * Get the number of bytes the message was padded by * and drop incomplete packets. */ pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; if (unlikely(tlen < (hdrsize + pad + 4))) goto drop; tlen -= hdrsize + pad + 4; /* * Check that the permissive LID is only used on QP0 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). */ if (qp->ibqp.qp_num) { if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || hdr->lrh[3] == IB_LID_PERMISSIVE)) goto drop; if (qp->ibqp.qp_num > 1) { u16 pkey1, pkey2; pkey1 = be32_to_cpu(ohdr->bth[0]); pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { qib_bad_pkey(ibp, pkey1, (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, src_qp, qp->ibqp.qp_num, hdr->lrh[3], hdr->lrh[1]); return; } } if (unlikely(qkey != qp->qkey)) return; /* Drop invalid MAD packets (see 13.5.3.1). */ if (unlikely(qp->ibqp.qp_num == 1 && (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) goto drop; } else { struct ib_smp *smp; /* Drop invalid MAD packets (see 13.5.3.1). */ if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) goto drop; smp = (struct ib_smp *) data; if ((hdr->lrh[1] == IB_LID_PERMISSIVE || hdr->lrh[3] == IB_LID_PERMISSIVE) && smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) goto drop; } /* * The opcode is in the low byte when its in network order * (top byte when in host order). */ opcode = be32_to_cpu(ohdr->bth[0]) >> 24; if (qp->ibqp.qp_num > 1 && opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { wc.ex.imm_data = ohdr->u.ud.imm_data; wc.wc_flags = IB_WC_WITH_IMM; } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { wc.ex.imm_data = 0; wc.wc_flags = 0; } else goto drop; /* * A GRH is expected to precede the data even if not * present on the wire. */ wc.byte_len = tlen + sizeof(struct ib_grh); /* * Get the next work request entry to find where to put the data. */ if (qp->r_flags & RVT_R_REUSE_SGE) qp->r_flags &= ~RVT_R_REUSE_SGE; else { int ret; ret = rvt_get_rwqe(qp, false); if (ret < 0) { rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); return; } if (!ret) { if (qp->ibqp.qp_num == 0) ibp->rvp.n_vl15_dropped++; return; } } /* Silently drop packets which are too big. */ if (unlikely(wc.byte_len > qp->r_len)) { qp->r_flags |= RVT_R_REUSE_SGE; goto drop; } if (has_grh) { rvt_copy_sge(qp, &qp->r_sge, &hdr->u.l.grh, sizeof(struct ib_grh), true, false); wc.wc_flags |= IB_WC_GRH; } else rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), true, false); rvt_put_ss(&qp->r_sge); if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) return; wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.opcode = IB_WC_RECV; wc.vendor_err = 0; wc.qp = &qp->ibqp; wc.src_qp = src_qp; wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0; wc.slid = be16_to_cpu(hdr->lrh[3]); wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; dlid = be16_to_cpu(hdr->lrh[1]); /* * Save the LMC lower bits if the destination LID is a unicast LID. */ wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 : dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); wc.port_num = qp->port_num; /* Signal completion event if the solicited bit is set. */ rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, ib_bth_is_solicited(ohdr)); return; drop: ibp->rvp.n_pkt_drops++; }