[PATCH v2 43/49] IB/hfi1: add UD QP handling

Mike Marciniszyn
2015-06-15T13:29:51Z

drivers/infiniband/hw/hfi1/ud.c | 886 +++++++++++++++++++++++++++++++++++++++
1 file changed, 886 insertions(+)
create mode 100644 drivers/infiniband/hw/hfi1/ud.c

diff --git a/drivers/infiniband/hw/hfi1/ud.c b/drivers/infiniband/hw/hfi1/ud.c
new file mode 100644
index 0000000..94c65a4
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/ud.c
@@ -0,0 +1,886 @@
+/*
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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 "qp.h"
+
+/**
+ * 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 HCA.
+ * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
+ * while this is being called.
+ */
+static void ud_loopback(struct hfi1_qp *sqp, struct hfi1_swqe *swqe)
+{
+ struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
+ struct hfi1_pportdata *ppd;
+ struct hfi1_qp *qp;
+ struct ib_ah_attr *ah_attr;
+ unsigned long flags;
+ struct hfi1_sge_state ssge;
+ struct hfi1_sge *sge;
+ struct ib_wc wc;
+ u32 length;
+ enum ib_qp_type sqptype, dqptype;
+
+ qp = hfi1_lookup_qpn(ibp, swqe->wr.wr.ud.remote_qpn);
+ if (!qp) {
+ ibp->n_pkt_drops++;
+ 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_hfi1_state_ops[qp->state] & HFI1_PROCESS_RECV_OK)) {
+ ibp->n_pkt_drops++;
+ goto drop;
+ }
+
+ ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr;
+ ppd = ppd_from_ibp(ibp);
+
+ if (qp->ibqp.qp_num > 1) {
+ u16 pkey;
+ u16 slid;
+ u8 sc5 = ibp->sl_to_sc[ah_attr->sl];
+
+ pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
+ slid = ppd->lid | (ah_attr->src_path_bits &
+ ((1 << ppd->lmc) - 1));
+ if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
+ qp->s_pkey_index, slid))) {
+ hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, pkey,
+ ah_attr->sl,
+ sqp->ibqp.qp_num, qp->ibqp.qp_num,
+ cpu_to_be16(slid),
+ cpu_to_be16(ah_attr->dlid));
+ 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->wr.wr.ud.remote_qkey < 0 ?
+ sqp->qkey : swqe->wr.wr.ud.remote_qkey;
+ if (unlikely(qkey != qp->qkey)) {
+ u16 lid;
+
+ lid = ppd->lid | (ah_attr->src_path_bits &
+ ((1 << ppd->lmc) - 1));
+ hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey,
+ ah_attr->sl,
+ sqp->ibqp.qp_num, qp->ibqp.qp_num,
+ cpu_to_be16(lid),
+ cpu_to_be16(ah_attr->dlid));
+ 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 & HFI1_R_REUSE_SGE)
+ qp->r_flags &= ~HFI1_R_REUSE_SGE;
+ else {
+ int ret;
+
+ ret = hfi1_get_rwqe(qp, 0);
+ if (ret < 0) {
+ hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
+ goto bail_unlock;
+ }
+ if (!ret) {
+ if (qp->ibqp.qp_num == 0)
+ ibp->n_vl15_dropped++;
+ goto bail_unlock;
+ }
+ }
+ /* Silently drop packets which are too big. */
+ if (unlikely(wc.byte_len > qp->r_len)) {
+ qp->r_flags |= HFI1_R_REUSE_SGE;
+ ibp->n_pkt_drops++;
+ goto bail_unlock;
+ }
+
+ if (ah_attr->ah_flags & IB_AH_GRH) {
+ hfi1_copy_sge(&qp->r_sge, &ah_attr->grh,
+ sizeof(struct ib_grh), 1);
+ wc.wc_flags |= IB_WC_GRH;
+ } else
+ hfi1_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1);
+ 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;
+ BUG_ON(len == 0);
+ hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, 1);
+ 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 >= HFI1_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;
+ }
+ hfi1_put_ss(&qp->r_sge);
+ if (!test_and_clear_bit(HFI1_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->wr.wr.ud.pkey_index;
+ else
+ wc.pkey_index = sqp->s_pkey_index;
+ } else {
+ wc.pkey_index = 0;
+ }
+ wc.slid = ppd->lid | (ah_attr->src_path_bits & ((1 << ppd->lmc) - 1));
+ /* Check for loopback when the port lid is not set */
+ if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
+ wc.slid = HFI1_PERMISSIVE_LID;
+ wc.sl = ah_attr->sl;
+ wc.dlid_path_bits = ah_attr->dlid & ((1 << ppd->lmc) - 1);
+ wc.port_num = qp->port_num;
+ /* Signal completion event if the solicited bit is set. */
+ hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ swqe->wr.send_flags & IB_SEND_SOLICITED);
+ ibp->n_loop_pkts++;
+bail_unlock:
+ spin_unlock_irqrestore(&qp->r_lock, flags);
+drop:
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+}
+
+/**
+ * hfi1_make_ud_req - construct a UD request packet
+ * @qp: the QP
+ *
+ * Return 1 if constructed; otherwise, return 0.
+ */
+int hfi1_make_ud_req(struct hfi1_qp *qp)
+{
+ struct hfi1_other_headers *ohdr;
+ struct ib_ah_attr *ah_attr;
+ struct hfi1_pportdata *ppd;
+ struct hfi1_ibport *ibp;
+ struct hfi1_swqe *wqe;
+ unsigned long flags;
+ u32 nwords;
+ u32 extra_bytes;
+ u32 bth0;
+ u16 lrh0;
+ u16 lid;
+ int ret = 0;
+ int next_cur;
+ u8 sc5;
+
+ spin_lock_irqsave(&qp->s_lock, flags);
+
+ if (!(ib_hfi1_state_ops[qp->state] & HFI1_PROCESS_NEXT_SEND_OK)) {
+ if (!(ib_hfi1_state_ops[qp->state] & HFI1_FLUSH_SEND))
+ goto bail;
+ /* We are in the error state, flush the work request. */
+ if (qp->s_last == qp->s_head)
+ goto bail;
+ /* If DMAs are in progress, we can't flush immediately. */
+ if (atomic_read(&qp->s_iowait.sdma_busy)) {
+ qp->s_flags |= HFI1_S_WAIT_DMA;
+ goto bail;
+ }
+ wqe = get_swqe_ptr(qp, qp->s_last);
+ hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
+ goto done;
+ }
+
+ if (qp->s_cur == qp->s_head)
+ goto bail;
+
+ wqe = 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 = &to_iah(wqe->wr.wr.ud.ah)->attr;
+ if (ah_attr->dlid < HFI1_MULTICAST_LID_BASE ||
+ ah_attr->dlid == HFI1_PERMISSIVE_LID) {
+ lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1);
+ if (unlikely(!loopback && (lid == ppd->lid ||
+ (lid == HFI1_PERMISSIVE_LID &&
+ qp->ibqp.qp_type == IB_QPT_GSI)))) {
+ /*
+ * 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 (atomic_read(&qp->s_iowait.sdma_busy)) {
+ qp->s_flags |= HFI1_S_WAIT_DMA;
+ goto bail;
+ }
+ qp->s_cur = next_cur;
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ ud_loopback(qp, wqe);
+ spin_lock_irqsave(&qp->s_lock, flags);
+ hfi1_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 = ah_attr->static_rate;
+ 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;
+
+ if (ah_attr->ah_flags & IB_AH_GRH) {
+ /* Header size in 32-bit words. */
+ qp->s_hdrwords += hfi1_make_grh(ibp, &qp->s_hdr->ibh.u.l.grh,
+ &ah_attr->grh,
+ qp->s_hdrwords, nwords);
+ lrh0 = HFI1_LRH_GRH;
+ ohdr = &qp->s_hdr->ibh.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 = HFI1_LRH_BTH;
+ ohdr = &qp->s_hdr->ibh.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;
+ sc5 = ibp->sl_to_sc[ah_attr->sl];
+ lrh0 |= (ah_attr->sl & 0xf) << 4;
+ if (qp->ibqp.qp_type == IB_QPT_SMI) {
+ lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
+ qp->s_sc = 0xf;
+ } else {
+ lrh0 |= (sc5 & 0xf) << 12;
+ qp->s_sc = sc5;
+ }
+ qp->s_hdr->ibh.lrh[0] = cpu_to_be16(lrh0);
+ qp->s_hdr->ibh.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */
+ qp->s_hdr->ibh.lrh[2] =
+ cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
+ if (ah_attr->dlid == be16_to_cpu(IB_LID_PERMISSIVE))
+ qp->s_hdr->ibh.lrh[3] = IB_LID_PERMISSIVE;
+ else {
+ lid = ppd->lid;
+ if (lid) {
+ lid |= ah_attr->src_path_bits & ((1 << ppd->lmc) - 1);
+ qp->s_hdr->ibh.lrh[3] = cpu_to_be16(lid);
+ } else
+ qp->s_hdr->ibh.lrh[3] = IB_LID_PERMISSIVE;
+ }
+ 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)
+ bth0 |= hfi1_get_pkey(ibp, wqe->wr.wr.ud.pkey_index);
+ else
+ bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index);
+ ohdr->bth[0] = cpu_to_be32(bth0);
+ ohdr->bth[1] = cpu_to_be32(wqe->wr.wr.ud.remote_qpn);
+ ohdr->bth[2] = cpu_to_be32(mask_psn(qp->s_next_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->wr.wr.ud.remote_qkey < 0 ?
+ qp->qkey : wqe->wr.wr.ud.remote_qkey);
+ ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
+ /* disarm any ahg */
+ qp->s_hdr->ahgcount = 0;
+ qp->s_hdr->ahgidx = 0;
+ qp->s_hdr->tx_flags = 0;
+ qp->s_hdr->sde = NULL;
+
+done:
+ ret = 1;
+ goto unlock;
+
+bail:
+ qp->s_flags &= ~HFI1_S_BUSY;
+unlock:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ return ret;
+}
+
+/*
+ * 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(struct hfi1_ibport *ibp, struct hfi1_qp *qp, u32 remote_qpn,
+ u32 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_ib_header hdr;
+ struct hfi1_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);
+
+ if (old_grh) {
+ struct ib_grh *grh = &hdr.u.l.grh;
+
+ grh->version_tclass_flow = old_grh->version_tclass_flow;
+ grh->paylen = cpu_to_be16((hwords - 2 + SIZE_OF_CRC) << 2);
+ grh->hop_limit = 0xff;
+ grh->sgid = old_grh->dgid;
+ grh->dgid = old_grh->sgid;
+ ohdr = &hdr.u.l.oth;
+ lrh0 = HFI1_LRH_GRH;
+ hwords += sizeof(struct ib_grh) / sizeof(u32);
+ } else {
+ ohdr = &hdr.u.oth;
+ lrh0 = HFI1_LRH_BTH;
+ }
+
+ lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
+
+ bth0 = pkey | (CNP_OPCODE << 24);
+ ohdr->bth[0] = cpu_to_be32(bth0);
+
+ ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << HFI1_BECN_SHIFT));
+ ohdr->bth[2] = 0; /* PSN 0 */
+
+ hdr.lrh[0] = cpu_to_be16(lrh0);
+ hdr.lrh[1] = cpu_to_be16(dlid);
+ hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
+ hdr.lrh[3] = cpu_to_be16(slid);
+
+ plen = 2 /* PBC */ + hwords;
+ pbc_flags |= (!!(sc5 & 0x10)) << 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 (pbuf)
+ 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 0.90, section 9.10.26
+ * ("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 hfi1_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 (ingress_pkey_check(ppd, pkey, sc5, qp->s_pkey_index, 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, trap, or trap repress.
+ * Our response depends, in part, on which type of
+ * SMP we're processing.
+ *
+ * If this is not an SMA request, or trap repress:
+ * - accept MAD if the port is running an SM
+ * - pkey == FULL_MGMT_P_KEY =>
+ * reply with unsupported method (i.e., just mark
+ * the smp's status field here, and let it be
+ * processed normally)
+ * - pkey != LIM_MGMT_P_KEY =>
+ * increment port recv constraint errors, drop MAD
+ * If this is an SMA request or trap repress:
+ * - pkey != FULL_MGMT_P_KEY =>
+ * increment port recv constraint errors, drop MAD
+ */
+ switch (smp->method) {
+ 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;
+ case IB_MGMT_METHOD_SEND:
+ case IB_MGMT_METHOD_TRAP:
+ case IB_MGMT_METHOD_GET_RESP:
+ case IB_MGMT_METHOD_REPORT_RESP:
+ if (ibp->port_cap_flags & IB_PORT_SM)
+ return 0;
+ if (pkey == FULL_MGMT_P_KEY) {
+ smp->status |= IB_SMP_UNSUP_METHOD;
+ return 0;
+ }
+ if (pkey != LIM_MGMT_P_KEY) {
+ ingress_pkey_table_fail(ppd, pkey, slid);
+ return 1;
+ }
+ break;
+ default:
+ break;
+ }
+ 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_ibport *ibp, struct hfi1_ib_header *hdr,
+ u32 rcv_flags, void *data, u32 tlen, struct hfi1_qp *qp)
+{
+ struct hfi1_other_headers *ohdr;
+ int opcode;
+ u32 hdrsize;
+ u32 pad;
+ struct ib_wc wc;
+ u32 qkey;
+ u32 src_qp;
+ u16 dlid, pkey;
+ int mgmt_pkey_idx = -1;
+ int has_grh = !!(rcv_flags & HFI1_HAS_GRH);
+ int sc4_bit = (!!(rcv_flags & HFI1_SC4_BIT)) << 4;
+ u8 sc;
+ int is_becn, is_fecn, is_mcast;
+ struct ib_grh *grh = NULL;
+
+ /* 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 */
+ grh = &hdr->u.l.grh;
+ }
+ qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
+ src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & HFI1_QPN_MASK;
+ dlid = be16_to_cpu(hdr->lrh[1]);
+ is_mcast = (dlid > HFI1_MULTICAST_LID_BASE) &&
+ (dlid != HFI1_PERMISSIVE_LID);
+ is_becn = (be32_to_cpu(ohdr->bth[1]) >> HFI1_BECN_SHIFT)
+ & HFI1_BECN_MASK;
+ is_fecn = (be32_to_cpu(ohdr->bth[1]) >> HFI1_FECN_SHIFT)
+ & HFI1_FECN_MASK;
+
+ if (is_becn) {
+ /*
+ * In pre-B0 h/w the CNP_OPCODE is handled via an
+ * error path (errata 291394).
+ */
+ struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+ u32 lqpn = be32_to_cpu(ohdr->bth[1]) & HFI1_QPN_MASK;
+ u8 sl, sc5;
+
+ sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
+ sc5 |= sc4_bit;
+ sl = ibp->sc_to_sl[sc5];
+
+ process_becn(ppd, sl, 0, lqpn, 0, IB_CC_SVCTYPE_UD);
+ }
+
+ /*
+ * 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;
+ opcode &= 0xff;
+
+ pkey = (u16)be32_to_cpu(ohdr->bth[0]);
+
+ if (!is_mcast && (opcode != CNP_OPCODE) && is_fecn) {
+ u16 slid = be16_to_cpu(hdr->lrh[3]);
+ u8 sc5;
+
+ sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
+ sc5 |= sc4_bit;
+
+ return_cnp(ibp, qp, src_qp, pkey, dlid, slid, sc5, grh);
+ }
+ /*
+ * 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) {
+ struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+ u16 slid;
+ u8 sc5;
+
+ sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
+ sc5 |= sc4_bit;
+
+ slid = be16_to_cpu(hdr->lrh[3]);
+ if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
+ qp->s_pkey_index,
+ slid))) {
+ hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY,
+ pkey,
+ (be16_to_cpu(hdr->lrh[0]) >> 4) &
+ 0xF,
+ src_qp, qp->ibqp.qp_num,
+ hdr->lrh[3], hdr->lrh[1]);
+ return;
+ }
+ } else {
+ /* GSI packet */
+ mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
+ if (mgmt_pkey_idx < 0)
+ goto drop;
+
+ }
+ if (unlikely(qkey != qp->qkey)) {
+ hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey,
+ (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
+ src_qp, qp->ibqp.qp_num,
+ hdr->lrh[3], hdr->lrh[1]);
+ return;
+ }
+ /* Drop invalid MAD packets (see 13.5.3.1). */
+ if (unlikely(qp->ibqp.qp_num == 1 &&
+ (tlen > 2048 ||
+ (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))
+ goto drop;
+ } else {
+ /* Received on QP0, and so by definition, this is an SMP */
+ struct opa_smp *smp = (struct opa_smp *)data;
+ u16 slid = be16_to_cpu(hdr->lrh[3]);
+ u8 sc5;
+
+ sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
+ sc5 |= sc4_bit;
+
+ if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
+ goto drop;
+
+ if (tlen > 2048)
+ goto drop;
+ if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||
+ hdr->lrh[3] == IB_LID_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 = ohdr->u.ud.imm_data;
+ wc.wc_flags = IB_WC_WITH_IMM;
+ tlen -= sizeof(u32);
+ } 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 & HFI1_R_REUSE_SGE)
+ qp->r_flags &= ~HFI1_R_REUSE_SGE;
+ else {
+ int ret;
+
+ ret = hfi1_get_rwqe(qp, 0);
+ if (ret < 0) {
+ hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
+ return;
+ }
+ if (!ret) {
+ if (qp->ibqp.qp_num == 0)
+ ibp->n_vl15_dropped++;
+ return;
+ }
+ }
+ /* Silently drop packets which are too big. */
+ if (unlikely(wc.byte_len > qp->r_len)) {
+ qp->r_flags |= HFI1_R_REUSE_SGE;
+ goto drop;
+ }
+ if (has_grh) {
+ hfi1_copy_sge(&qp->r_sge, &hdr->u.l.grh,
+ sizeof(struct ib_grh), 1);
+ wc.wc_flags |= IB_WC_GRH;
+ } else
+ hfi1_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1);
+ hfi1_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1);
+ hfi1_put_ss(&qp->r_sge);
+ if (!test_and_clear_bit(HFI1_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_pportdata *ppd = ppd_from_ibp(ibp);
+ 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;
+
+ wc.slid = be16_to_cpu(hdr->lrh[3]);
+ sc = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xf;
+ sc |= sc4_bit;
+ wc.sl = ibp->sc_to_sl[sc];
+
+ /*
+ * Save the LMC lower bits if the destination LID is a unicast LID.
+ */
+ wc.dlid_path_bits = dlid >= HFI1_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. */
+ hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ (ohdr->bth[0] &
+ cpu_to_be32(IB_BTH_SOLICITED)) != 0);
+ return;
+
+drop:
+ ibp->n_pkt_drops++;