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Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/ud.c | 1089 |
1 files changed, 1089 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/ud.c b/drivers/infiniband/hw/hfi1/ud.c new file mode 100644 index 000000000..839593641 --- /dev/null +++ b/drivers/infiniband/hw/hfi1/ud.c @@ -0,0 +1,1089 @@ +/* + * 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 <linux/net.h> +#include <rdma/ib_smi.h> + +#include "hfi.h" +#include "mad.h" +#include "verbs_txreq.h" +#include "trace_ibhdrs.h" +#include "qp.h" + +/* We support only two types - 9B and 16B for now */ +static const hfi1_make_req hfi1_make_ud_req_tbl[2] = { + [HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B, + [HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B +}; + +/** + * ud_loopback - handle send on loopback QPs + * @sqp: the sending QP + * @swqe: the send work request + * + * This is called from hfi1_make_ud_req() to forward a WQE addressed + * to the same HFI. + * Note that the receive interrupt handler may be calling hfi1_ud_rcv() + * while this is being called. + */ +static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe) +{ + struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); + struct hfi1_pportdata *ppd; + struct hfi1_qp_priv *priv = sqp->priv; + 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(ib_to_rvt(sqp->ibqp.device), &ibp->rvp, + swqe->ud_wr.remote_qpn); + if (!qp) { + ibp->rvp.n_pkt_drops++; + rcu_read_unlock(); + return; + } + + 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 pkey; + u32 slid; + u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)]; + + pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index); + slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & + ((1 << ppd->lmc) - 1)); + if (unlikely(ingress_pkey_check(ppd, pkey, sc5, + qp->s_pkey_index, + slid, false))) { + hfi1_bad_pkey(ibp, pkey, + rdma_ah_get_sl(ah_attr), + sqp->ibqp.qp_num, qp->ibqp.qp_num, + slid, 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; /* silently drop per IBTA spec */ + } + + /* + * 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; + struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr)); + + /* + * For loopback packets with extended LIDs, the + * sgid_index in the GRH is 0 and the dgid is + * OPA GID of the sender. While creating a response + * to the loopback packet, IB core creates the new + * sgid_index from the DGID and that will be the + * OPA_GID_INDEX. The new dgid is from the sgid + * index and that will be in the IB GID format. + * + * We now have a case where the sent packet had a + * different sgid_index and dgid compared to the + * one that was received in response. + * + * Fix this inconsistency. + */ + if (priv->hdr_type == HFI1_PKT_TYPE_16B) { + if (grd.sgid_index == 0) + grd.sgid_index = OPA_GID_INDEX; + + if (ib_is_opa_gid(&grd.dgid)) + grd.dgid.global.interface_id = + cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]); + } + + hfi1_make_grh(ibp, &grh, &grd, 0, 0); + hfi1_copy_sge(&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 = sge->length; + + if (len > length) + len = length; + if (len > sge->sge_length) + len = sge->sge_length; + WARN_ON_ONCE(len == 0); + hfi1_copy_sge(&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; + if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) { + if (sqp->ibqp.qp_type == IB_QPT_GSI || + sqp->ibqp.qp_type == IB_QPT_SMI) + wc.pkey_index = swqe->ud_wr.pkey_index; + else + wc.pkey_index = sqp->s_pkey_index; + } else { + wc.pkey_index = 0; + } + wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) & + ((1 << ppd->lmc) - 1))) & U16_MAX; + /* Check for loopback when the port lid is not set */ + if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI) + wc.slid = be16_to_cpu(IB_LID_PERMISSIVE); + 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(); +} + +static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe, + struct ib_other_headers *ohdr, + u16 *pkey, u32 extra_bytes, bool bypass) +{ + u32 bth0; + struct hfi1_ibport *ibp; + + ibp = to_iport(qp->ibqp.device, qp->port_num); + if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { + 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; + } + + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + bth0 |= extra_bytes << 20; + if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) + *pkey = hfi1_get_pkey(ibp, wqe->ud_wr.pkey_index); + else + *pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); + if (!bypass) + bth0 |= *pkey; + ohdr->bth[0] = cpu_to_be32(bth0); + ohdr->bth[1] = cpu_to_be32(wqe->ud_wr.remote_qpn); + ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn)); + /* + * 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); +} + +void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps, + struct rvt_swqe *wqe) +{ + u32 nwords, extra_bytes; + u16 len, slid, dlid, pkey; + u16 lrh0 = 0; + u8 sc5; + struct hfi1_qp_priv *priv = qp->priv; + struct ib_other_headers *ohdr; + struct rdma_ah_attr *ah_attr; + struct hfi1_pportdata *ppd; + struct hfi1_ibport *ibp; + struct ib_grh *grh; + + ibp = to_iport(qp->ibqp.device, qp->port_num); + ppd = ppd_from_ibp(ibp); + ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; + + extra_bytes = -wqe->length & 3; + nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC; + /* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */ + ps->s_txreq->hdr_dwords = 7; + if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) + ps->s_txreq->hdr_dwords++; + + if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { + grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; + ps->s_txreq->hdr_dwords += + hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr), + ps->s_txreq->hdr_dwords - LRH_9B_DWORDS, + nwords); + lrh0 = HFI1_LRH_GRH; + ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth; + } else { + lrh0 = HFI1_LRH_BTH; + ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth; + } + + sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)]; + lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4; + if (qp->ibqp.qp_type == IB_QPT_SMI) { + lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ + priv->s_sc = 0xf; + } else { + lrh0 |= (sc5 & 0xf) << 12; + priv->s_sc = sc5; + } + + dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B); + if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) { + slid = be16_to_cpu(IB_LID_PERMISSIVE); + } else { + u16 lid = (u16)ppd->lid; + + if (lid) { + lid |= rdma_ah_get_path_bits(ah_attr) & + ((1 << ppd->lmc) - 1); + slid = lid; + } else { + slid = be16_to_cpu(IB_LID_PERMISSIVE); + } + } + hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false); + len = ps->s_txreq->hdr_dwords + nwords; + + /* Setup the packet */ + ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B; + hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, + lrh0, len, dlid, slid); +} + +void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps, + struct rvt_swqe *wqe) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct ib_other_headers *ohdr; + struct rdma_ah_attr *ah_attr; + struct hfi1_pportdata *ppd; + struct hfi1_ibport *ibp; + u32 dlid, slid, nwords, extra_bytes; + u32 dest_qp = wqe->ud_wr.remote_qpn; + u32 src_qp = qp->ibqp.qp_num; + u16 len, pkey; + u8 l4, sc5; + bool is_mgmt = false; + + ibp = to_iport(qp->ibqp.device, qp->port_num); + ppd = ppd_from_ibp(ibp); + ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; + + /* + * Build 16B Management Packet if either the destination + * or source queue pair number is 0 or 1. + */ + if (dest_qp == 0 || src_qp == 0 || dest_qp == 1 || src_qp == 1) { + /* header size in dwords 16B LRH+L4_FM = (16+8)/4. */ + ps->s_txreq->hdr_dwords = 6; + is_mgmt = true; + } else { + /* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */ + ps->s_txreq->hdr_dwords = 9; + if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) + ps->s_txreq->hdr_dwords++; + } + + /* SW provides space for CRC and LT for bypass packets. */ + extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2), + wqe->length); + nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC; + + if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) && + hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) { + struct ib_grh *grh; + struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr); + /* + * Ensure OPA GIDs are transformed to IB gids + * before creating the GRH. + */ + if (grd->sgid_index == OPA_GID_INDEX) { + dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n", + grd->sgid_index); + grd->sgid_index = 0; + } + grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; + ps->s_txreq->hdr_dwords += hfi1_make_grh( + ibp, grh, grd, + ps->s_txreq->hdr_dwords - LRH_16B_DWORDS, + nwords); + ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth; + l4 = OPA_16B_L4_IB_GLOBAL; + } else { + ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth; + l4 = OPA_16B_L4_IB_LOCAL; + } + + sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)]; + if (qp->ibqp.qp_type == IB_QPT_SMI) + priv->s_sc = 0xf; + else + priv->s_sc = sc5; + + dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B); + if (!ppd->lid) + slid = be32_to_cpu(OPA_LID_PERMISSIVE); + else + slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & + ((1 << ppd->lmc) - 1)); + + if (is_mgmt) { + l4 = OPA_16B_L4_FM; + pkey = hfi1_get_pkey(ibp, wqe->ud_wr.pkey_index); + hfi1_16B_set_qpn(&ps->s_txreq->phdr.hdr.opah.u.mgmt, + dest_qp, src_qp); + } else { + hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true); + } + /* Convert dwords to flits */ + len = (ps->s_txreq->hdr_dwords + nwords) >> 1; + + /* Setup the packet */ + ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B; + hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, + slid, dlid, len, pkey, 0, 0, l4, priv->s_sc); +} + +/** + * hfi1_make_ud_req - construct a UD request packet + * @qp: the QP + * + * Assume s_lock is held. + * + * Return 1 if constructed; otherwise, return 0. + */ +int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct rdma_ah_attr *ah_attr; + struct hfi1_pportdata *ppd; + struct hfi1_ibport *ibp; + struct rvt_swqe *wqe; + int next_cur; + u32 lid; + + ps->s_txreq = get_txreq(ps->dev, qp); + if (!ps->s_txreq) + goto bail_no_tx; + + 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 (iowait_sdma_pending(&priv->s_iowait)) { + qp->s_flags |= RVT_S_WAIT_DMA; + goto bail; + } + wqe = rvt_get_swqe_ptr(qp, qp->s_last); + hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); + goto done_free_tx; + } + + /* 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; + priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr); + if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) || + (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) { + lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); + if (unlikely(!loopback && + ((lid == ppd->lid) || + ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) && + (qp->ibqp.qp_type == IB_QPT_GSI))))) { + unsigned long tflags = ps->flags; + /* + * If DMAs are in progress, we can't generate + * a completion for the loopback packet since + * it would be out of order. + * Instead of waiting, we could queue a + * zero length descriptor so we get a callback. + */ + if (iowait_sdma_pending(&priv->s_iowait)) { + qp->s_flags |= RVT_S_WAIT_DMA; + goto bail; + } + qp->s_cur = next_cur; + spin_unlock_irqrestore(&qp->s_lock, tflags); + ud_loopback(qp, wqe); + spin_lock_irqsave(&qp->s_lock, tflags); + ps->flags = tflags; + hfi1_send_complete(qp, wqe, IB_WC_SUCCESS); + goto done_free_tx; + } + } + + qp->s_cur = next_cur; + ps->s_txreq->s_cur_size = wqe->length; + ps->s_txreq->ss = &qp->s_sge; + qp->s_srate = rdma_ah_get_static_rate(ah_attr); + qp->srate_mbps = ib_rate_to_mbps(qp->s_srate); + 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; + + /* Make the appropriate header */ + hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe); + priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc); + ps->s_txreq->sde = priv->s_sde; + priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc); + ps->s_txreq->psc = priv->s_sendcontext; + /* disarm any ahg */ + priv->s_ahg->ahgcount = 0; + priv->s_ahg->ahgidx = 0; + priv->s_ahg->tx_flags = 0; + + return 1; + +done_free_tx: + hfi1_put_txreq(ps->s_txreq); + ps->s_txreq = NULL; + return 1; + +bail: + hfi1_put_txreq(ps->s_txreq); + +bail_no_tx: + ps->s_txreq = NULL; + qp->s_flags &= ~RVT_S_BUSY; + return 0; +} + +/* + * Hardware can't check this so we do it here. + * + * This is a slightly different algorithm than the standard pkey check. It + * special cases the management keys and allows for 0x7fff and 0xffff to be in + * the table at the same time. + * + * @returns the index found or -1 if not found + */ +int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey) +{ + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + unsigned i; + + if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) { + unsigned lim_idx = -1; + + for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) { + /* here we look for an exact match */ + if (ppd->pkeys[i] == pkey) + return i; + if (ppd->pkeys[i] == LIM_MGMT_P_KEY) + lim_idx = i; + } + + /* did not find 0xffff return 0x7fff idx if found */ + if (pkey == FULL_MGMT_P_KEY) + return lim_idx; + + /* no match... */ + return -1; + } + + pkey &= 0x7fff; /* remove limited/full membership bit */ + + for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) + if ((ppd->pkeys[i] & 0x7fff) == pkey) + return i; + + /* + * Should not get here, this means hardware failed to validate pkeys. + */ + return -1; +} + +void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp, + u32 remote_qpn, u16 pkey, u32 slid, u32 dlid, + u8 sc5, const struct ib_grh *old_grh) +{ + u64 pbc, pbc_flags = 0; + u32 bth0, plen, vl, hwords = 7; + u16 len; + u8 l4; + struct hfi1_opa_header hdr; + struct ib_other_headers *ohdr; + struct pio_buf *pbuf; + struct send_context *ctxt = qp_to_send_context(qp, sc5); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + u32 nwords; + + hdr.hdr_type = HFI1_PKT_TYPE_16B; + /* Populate length */ + nwords = ((hfi1_get_16b_padding(hwords << 2, 0) + + SIZE_OF_LT) >> 2) + SIZE_OF_CRC; + if (old_grh) { + struct ib_grh *grh = &hdr.opah.u.l.grh; + + grh->version_tclass_flow = old_grh->version_tclass_flow; + grh->paylen = cpu_to_be16( + (hwords - LRH_16B_DWORDS + nwords) << 2); + grh->hop_limit = 0xff; + grh->sgid = old_grh->dgid; + grh->dgid = old_grh->sgid; + ohdr = &hdr.opah.u.l.oth; + l4 = OPA_16B_L4_IB_GLOBAL; + hwords += sizeof(struct ib_grh) / sizeof(u32); + } else { + ohdr = &hdr.opah.u.oth; + l4 = OPA_16B_L4_IB_LOCAL; + } + + /* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */ + bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) | + (hfi1_get_16b_padding(hwords << 2, 0) << 20); + ohdr->bth[0] = cpu_to_be32(bth0); + + ohdr->bth[1] = cpu_to_be32(remote_qpn); + ohdr->bth[2] = 0; /* PSN 0 */ + + /* Convert dwords to flits */ + len = (hwords + nwords) >> 1; + hfi1_make_16b_hdr(&hdr.opah, slid, dlid, len, pkey, 1, 0, l4, sc5); + + plen = 2 /* PBC */ + hwords + nwords; + pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC; + vl = sc_to_vlt(ppd->dd, sc5); + pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); + if (ctxt) { + pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL); + if (!IS_ERR_OR_NULL(pbuf)) { + trace_pio_output_ibhdr(ppd->dd, &hdr, sc5); + ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, + &hdr, hwords); + } + } +} + +void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn, + u16 pkey, u32 slid, u32 dlid, u8 sc5, + const struct ib_grh *old_grh) +{ + u64 pbc, pbc_flags = 0; + u32 bth0, plen, vl, hwords = 5; + u16 lrh0; + u8 sl = ibp->sc_to_sl[sc5]; + struct hfi1_opa_header hdr; + struct ib_other_headers *ohdr; + struct pio_buf *pbuf; + struct send_context *ctxt = qp_to_send_context(qp, sc5); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + + hdr.hdr_type = HFI1_PKT_TYPE_9B; + if (old_grh) { + struct ib_grh *grh = &hdr.ibh.u.l.grh; + + grh->version_tclass_flow = old_grh->version_tclass_flow; + grh->paylen = cpu_to_be16( + (hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2); + grh->hop_limit = 0xff; + grh->sgid = old_grh->dgid; + grh->dgid = old_grh->sgid; + ohdr = &hdr.ibh.u.l.oth; + lrh0 = HFI1_LRH_GRH; + hwords += sizeof(struct ib_grh) / sizeof(u32); + } else { + ohdr = &hdr.ibh.u.oth; + lrh0 = HFI1_LRH_BTH; + } + + lrh0 |= (sc5 & 0xf) << 12 | sl << 4; + + bth0 = pkey | (IB_OPCODE_CNP << 24); + ohdr->bth[0] = cpu_to_be32(bth0); + + ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT)); + ohdr->bth[2] = 0; /* PSN 0 */ + + hfi1_make_ib_hdr(&hdr.ibh, lrh0, hwords + SIZE_OF_CRC, dlid, slid); + plen = 2 /* PBC */ + hwords; + pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT); + vl = sc_to_vlt(ppd->dd, sc5); + pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); + if (ctxt) { + pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL); + if (!IS_ERR_OR_NULL(pbuf)) { + trace_pio_output_ibhdr(ppd->dd, &hdr, sc5); + ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, + &hdr, hwords); + } + } +} + +/* + * opa_smp_check() - Do the regular pkey checking, and the additional + * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section + * 9.10.25 ("SMA Packet Checks"). + * + * Note that: + * - Checks are done using the pkey directly from the packet's BTH, + * and specifically _not_ the pkey that we attach to the completion, + * which may be different. + * - These checks are specifically for "non-local" SMPs (i.e., SMPs + * which originated on another node). SMPs which are sent from, and + * destined to this node are checked in opa_local_smp_check(). + * + * At the point where opa_smp_check() is called, we know: + * - destination QP is QP0 + * + * opa_smp_check() returns 0 if all checks succeed, 1 otherwise. + */ +static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5, + struct rvt_qp *qp, u16 slid, struct opa_smp *smp) +{ + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + + /* + * I don't think it's possible for us to get here with sc != 0xf, + * but check it to be certain. + */ + if (sc5 != 0xf) + return 1; + + if (rcv_pkey_check(ppd, pkey, sc5, slid)) + return 1; + + /* + * At this point we know (and so don't need to check again) that + * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY + * (see ingress_pkey_check). + */ + if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE && + smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) { + ingress_pkey_table_fail(ppd, pkey, slid); + return 1; + } + + /* + * SMPs fall into one of four (disjoint) categories: + * SMA request, SMA response, SMA trap, or SMA trap repress. + * Our response depends, in part, on which type of SMP we're + * processing. + * + * If this is an SMA response, skip the check here. + * + * If this is an SMA request or SMA trap repress: + * - pkey != FULL_MGMT_P_KEY => + * increment port recv constraint errors, drop MAD + * + * Otherwise: + * - accept if the port is running an SM + * - drop MAD if it's an SMA trap + * - pkey == FULL_MGMT_P_KEY => + * reply with unsupported method + * - pkey != FULL_MGMT_P_KEY => + * increment port recv constraint errors, drop MAD + */ + switch (smp->method) { + case IB_MGMT_METHOD_GET_RESP: + case IB_MGMT_METHOD_REPORT_RESP: + break; + case IB_MGMT_METHOD_GET: + case IB_MGMT_METHOD_SET: + case IB_MGMT_METHOD_REPORT: + case IB_MGMT_METHOD_TRAP_REPRESS: + if (pkey != FULL_MGMT_P_KEY) { + ingress_pkey_table_fail(ppd, pkey, slid); + return 1; + } + break; + default: + if (ibp->rvp.port_cap_flags & IB_PORT_SM) + return 0; + if (smp->method == IB_MGMT_METHOD_TRAP) + return 1; + if (pkey == FULL_MGMT_P_KEY) { + smp->status |= IB_SMP_UNSUP_METHOD; + return 0; + } + ingress_pkey_table_fail(ppd, pkey, slid); + return 1; + } + return 0; +} + +/** + * hfi1_ud_rcv - receive an incoming UD packet + * @ibp: the port the packet came in on + * @hdr: the packet header + * @rcv_flags: flags relevant to rcv processing + * @data: the packet data + * @tlen: the packet length + * @qp: the QP the packet came on + * + * This is called from qp_rcv() to process an incoming UD packet + * for the given QP. + * Called at interrupt level. + */ +void hfi1_ud_rcv(struct hfi1_packet *packet) +{ + u32 hdrsize = packet->hlen; + struct ib_wc wc; + u32 src_qp; + u16 pkey; + int mgmt_pkey_idx = -1; + struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + void *data = packet->payload; + u32 tlen = packet->tlen; + struct rvt_qp *qp = packet->qp; + u8 sc5 = packet->sc; + u8 sl_from_sc; + u8 opcode = packet->opcode; + u8 sl = packet->sl; + u32 dlid = packet->dlid; + u32 slid = packet->slid; + u8 extra_bytes; + u8 l4 = 0; + bool dlid_is_permissive; + bool slid_is_permissive; + bool solicited = false; + + extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2); + + if (packet->etype == RHF_RCV_TYPE_BYPASS) { + u32 permissive_lid = + opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B); + + l4 = hfi1_16B_get_l4(packet->hdr); + pkey = hfi1_16B_get_pkey(packet->hdr); + dlid_is_permissive = (dlid == permissive_lid); + slid_is_permissive = (slid == permissive_lid); + } else { + pkey = ib_bth_get_pkey(packet->ohdr); + dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE)); + slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE)); + } + sl_from_sc = ibp->sc_to_sl[sc5]; + + if (likely(l4 != OPA_16B_L4_FM)) { + src_qp = ib_get_sqpn(packet->ohdr); + solicited = ib_bth_is_solicited(packet->ohdr); + } else { + src_qp = hfi1_16B_get_src_qpn(packet->mgmt); + } + + process_ecn(qp, packet); + /* + * Get the number of bytes the message was padded by + * and drop incomplete packets. + */ + if (unlikely(tlen < (hdrsize + extra_bytes))) + goto drop; + + tlen -= hdrsize + extra_bytes; + + /* + * 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(dlid_is_permissive || slid_is_permissive)) + goto drop; + if (qp->ibqp.qp_num > 1) { + if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) { + /* + * Traps will not be sent for packets dropped + * by the HW. This is fine, as sending trap + * for invalid pkeys is optional according to + * IB spec (release 1.3, section 10.9.4) + */ + hfi1_bad_pkey(ibp, + pkey, sl, + src_qp, qp->ibqp.qp_num, + slid, dlid); + return; + } + } else { + /* GSI packet */ + mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey); + if (mgmt_pkey_idx < 0) + goto drop; + } + if (unlikely(l4 != OPA_16B_L4_FM && + ib_get_qkey(packet->ohdr) != qp->qkey)) + return; /* Silent drop */ + + /* Drop invalid MAD packets (see 13.5.3.1). */ + if (unlikely(qp->ibqp.qp_num == 1 && + (tlen > 2048 || (sc5 == 0xF)))) + goto drop; + } else { + /* Received on QP0, and so by definition, this is an SMP */ + struct opa_smp *smp = (struct opa_smp *)data; + + if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp)) + goto drop; + + if (tlen > 2048) + goto drop; + if ((dlid_is_permissive || slid_is_permissive) && + smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) + goto drop; + + /* look up SMI pkey */ + mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey); + if (mgmt_pkey_idx < 0) + goto drop; + } + + if (qp->ibqp.qp_num > 1 && + opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { + wc.ex.imm_data = packet->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 (packet->grh) { + hfi1_copy_sge(&qp->r_sge, packet->grh, + sizeof(struct ib_grh), true, false); + wc.wc_flags |= IB_WC_GRH; + } else if (packet->etype == RHF_RCV_TYPE_BYPASS) { + struct ib_grh grh; + /* + * Assuming we only created 16B on the send side + * if we want to use large LIDs, since GRH was stripped + * out when creating 16B, add back the GRH here. + */ + hfi1_make_ext_grh(packet, &grh, slid, dlid); + hfi1_copy_sge(&qp->r_sge, &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); + } + hfi1_copy_sge(&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; + + if (qp->ibqp.qp_type == IB_QPT_GSI || + qp->ibqp.qp_type == IB_QPT_SMI) { + if (mgmt_pkey_idx < 0) { + if (net_ratelimit()) { + struct hfi1_devdata *dd = ppd->dd; + + dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n", + qp->ibqp.qp_type); + mgmt_pkey_idx = 0; + } + } + wc.pkey_index = (unsigned)mgmt_pkey_idx; + } else { + wc.pkey_index = 0; + } + if (slid_is_permissive) + slid = be32_to_cpu(OPA_LID_PERMISSIVE); + wc.slid = slid & U16_MAX; + wc.sl = sl_from_sc; + + /* + * Save the LMC lower bits if the destination LID is a unicast LID. + */ + wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 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, solicited); + return; + +drop: + ibp->rvp.n_pkt_drops++; +} |