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linux/drivers/infiniband/hw/ipath/ipath_ud.c
Michael S. Tsirkin 062dbb69f3 IB: Return qp pointer as part of ib_wc 
struct ib_wc currently only includes the local QP number: this matches
the IB spec, but seems mostly useless. The following patch replaces
this with the pointer to qp itself, and updates all low level drivers
and all users.

This has the following advantages:
- Ability to get a per-qp context through wc->qp->qp_context
- Existing drivers already have the qp pointer ready in poll cq, so
  this change actually saves a tiny bit (extra memory read) on data path
  (for ehca it would actually be expensive to find the QP pointer when
  polling a CQ, but ehca does not support SRQ so we can leave wc->qp as
  NULL for ehca)
- Users that need the QP number can still get it through wc->qp->qp_num

Use case:

In IPoIB connected mode code, I have a common CQ shared by multiple
QPs.  To track connection usage, I need a way to get at some per-QP
context upon the completion, and I would like to avoid allocating
context object per work request just to stick a QP pointer into it.
With this code, I can just use wc->qp->qp_context.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2007-02-04 14:11:55 -08:00

673 lines
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/*
* Copyright (c) 2006 QLogic, Inc. 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 <rdma/ib_smi.h>
#include "ipath_verbs.h"
#include "ipath_kernel.h"
static int init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe,
u32 *lengthp, struct ipath_sge_state *ss)
{
int user = to_ipd(qp->ibqp.pd)->user;
int i, j, ret;
struct ib_wc wc;
*lengthp = 0;
for (i = j = 0; i < wqe->num_sge; i++) {
if (wqe->sg_list[i].length == 0)
continue;
/* Check LKEY */
if ((user && wqe->sg_list[i].lkey == 0) ||
!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge,
&wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE))
goto bad_lkey;
*lengthp += wqe->sg_list[i].length;
j++;
}
ss->num_sge = j;
ret = 1;
goto bail;
bad_lkey:
wc.wr_id = wqe->wr_id;
wc.status = IB_WC_LOC_PROT_ERR;
wc.opcode = IB_WC_RECV;
wc.vendor_err = 0;
wc.byte_len = 0;
wc.imm_data = 0;
wc.qp = &qp->ibqp;
wc.src_qp = 0;
wc.wc_flags = 0;
wc.pkey_index = 0;
wc.slid = 0;
wc.sl = 0;
wc.dlid_path_bits = 0;
wc.port_num = 0;
/* Signal solicited completion event. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
ret = 0;
bail:
return ret;
}
/**
* ipath_ud_loopback - handle send on loopback QPs
* @sqp: the QP
* @ss: the SGE state
* @length: the length of the data to send
* @wr: the work request
* @wc: the work completion entry
*
* This is called from ipath_post_ud_send() to forward a WQE addressed
* to the same HCA.
* Note that the receive interrupt handler may be calling ipath_ud_rcv()
* while this is being called.
*/
static void ipath_ud_loopback(struct ipath_qp *sqp,
struct ipath_sge_state *ss,
u32 length, struct ib_send_wr *wr,
struct ib_wc *wc)
{
struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
struct ipath_qp *qp;
struct ib_ah_attr *ah_attr;
unsigned long flags;
struct ipath_rq *rq;
struct ipath_srq *srq;
struct ipath_sge_state rsge;
struct ipath_sge *sge;
struct ipath_rwq *wq;
struct ipath_rwqe *wqe;
void (*handler)(struct ib_event *, void *);
u32 tail;
u32 rlen;
qp = ipath_lookup_qpn(&dev->qp_table, wr->wr.ud.remote_qpn);
if (!qp)
return;
/*
* 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 (unlikely(qp->ibqp.qp_num &&
((int) wr->wr.ud.remote_qkey < 0
? qp->qkey : wr->wr.ud.remote_qkey) != qp->qkey)) {
/* XXX OK to lose a count once in a while. */
dev->qkey_violations++;
dev->n_pkt_drops++;
goto done;
}
/*
* A GRH is expected to preceed the data even if not
* present on the wire.
*/
wc->byte_len = length + sizeof(struct ib_grh);
if (wr->opcode == IB_WR_SEND_WITH_IMM) {
wc->wc_flags = IB_WC_WITH_IMM;
wc->imm_data = wr->imm_data;
} else {
wc->wc_flags = 0;
wc->imm_data = 0;
}
if (wr->num_sge > 1) {
rsge.sg_list = kmalloc((wr->num_sge - 1) *
sizeof(struct ipath_sge),
GFP_ATOMIC);
} else
rsge.sg_list = NULL;
/*
* Get the next work request entry to find where to put the data.
* Note that it is safe to drop the lock after changing rq->tail
* since ipath_post_receive() won't fill the empty slot.
*/
if (qp->ibqp.srq) {
srq = to_isrq(qp->ibqp.srq);
handler = srq->ibsrq.event_handler;
rq = &srq->rq;
} else {
srq = NULL;
handler = NULL;
rq = &qp->r_rq;
}
spin_lock_irqsave(&rq->lock, flags);
wq = rq->wq;
tail = wq->tail;
while (1) {
if (unlikely(tail == wq->head)) {
spin_unlock_irqrestore(&rq->lock, flags);
dev->n_pkt_drops++;
goto bail_sge;
}
wqe = get_rwqe_ptr(rq, tail);
if (++tail >= rq->size)
tail = 0;
if (init_sge(qp, wqe, &rlen, &rsge))
break;
wq->tail = tail;
}
/* Silently drop packets which are too big. */
if (wc->byte_len > rlen) {
spin_unlock_irqrestore(&rq->lock, flags);
dev->n_pkt_drops++;
goto bail_sge;
}
wq->tail = tail;
wc->wr_id = wqe->wr_id;
if (handler) {
u32 n;
/*
* validate head pointer value and compute
* the number of remaining WQEs.
*/
n = wq->head;
if (n >= rq->size)
n = 0;
if (n < tail)
n += rq->size - tail;
else
n -= tail;
if (n < srq->limit) {
struct ib_event ev;
srq->limit = 0;
spin_unlock_irqrestore(&rq->lock, flags);
ev.device = qp->ibqp.device;
ev.element.srq = qp->ibqp.srq;
ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
handler(&ev, srq->ibsrq.srq_context);
} else
spin_unlock_irqrestore(&rq->lock, flags);
} else
spin_unlock_irqrestore(&rq->lock, flags);
ah_attr = &to_iah(wr->wr.ud.ah)->attr;
if (ah_attr->ah_flags & IB_AH_GRH) {
ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh));
wc->wc_flags |= IB_WC_GRH;
} else
ipath_skip_sge(&rsge, sizeof(struct ib_grh));
sge = &ss->sge;
while (length) {
u32 len = sge->length;
if (len > length)
len = length;
BUG_ON(len == 0);
ipath_copy_sge(&rsge, sge->vaddr, len);
sge->vaddr += len;
sge->length -= len;
sge->sge_length -= len;
if (sge->sge_length == 0) {
if (--ss->num_sge)
*sge = *ss->sg_list++;
} else if (sge->length == 0 && sge->mr != NULL) {
if (++sge->n >= IPATH_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;
}
wc->status = IB_WC_SUCCESS;
wc->opcode = IB_WC_RECV;
wc->vendor_err = 0;
wc->qp = &qp->ibqp;
wc->src_qp = sqp->ibqp.qp_num;
/* XXX do we know which pkey matched? Only needed for GSI. */
wc->pkey_index = 0;
wc->slid = dev->dd->ipath_lid |
(ah_attr->src_path_bits &
((1 << (dev->mkeyprot_resv_lmc & 7)) - 1));
wc->sl = ah_attr->sl;
wc->dlid_path_bits =
ah_attr->dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
/* Signal completion event if the solicited bit is set. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc,
wr->send_flags & IB_SEND_SOLICITED);
bail_sge:
kfree(rsge.sg_list);
done:
if (atomic_dec_and_test(&qp->refcount))
wake_up(&qp->wait);
}
/**
* ipath_post_ud_send - post a UD send on QP
* @qp: the QP
* @wr: the work request
*
* Note that we actually send the data as it is posted instead of putting
* the request into a ring buffer. If we wanted to use a ring buffer,
* we would need to save a reference to the destination address in the SWQE.
*/
int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr)
{
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
struct ipath_other_headers *ohdr;
struct ib_ah_attr *ah_attr;
struct ipath_sge_state ss;
struct ipath_sge *sg_list;
struct ib_wc wc;
u32 hwords;
u32 nwords;
u32 len;
u32 extra_bytes;
u32 bth0;
u16 lrh0;
u16 lid;
int i;
int ret;
if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
ret = 0;
goto bail;
}
/* IB spec says that num_sge == 0 is OK. */
if (wr->num_sge > qp->s_max_sge) {
ret = -EINVAL;
goto bail;
}
if (wr->num_sge > 1) {
sg_list = kmalloc((qp->s_max_sge - 1) * sizeof(*sg_list),
GFP_ATOMIC);
if (!sg_list) {
ret = -ENOMEM;
goto bail;
}
} else
sg_list = NULL;
/* Check the buffer to send. */
ss.sg_list = sg_list;
ss.sge.mr = NULL;
ss.sge.vaddr = NULL;
ss.sge.length = 0;
ss.sge.sge_length = 0;
ss.num_sge = 0;
len = 0;
for (i = 0; i < wr->num_sge; i++) {
/* Check LKEY */
if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) {
ret = -EINVAL;
goto bail;
}
if (wr->sg_list[i].length == 0)
continue;
if (!ipath_lkey_ok(qp, ss.num_sge ?
sg_list + ss.num_sge - 1 : &ss.sge,
&wr->sg_list[i], 0)) {
ret = -EINVAL;
goto bail;
}
len += wr->sg_list[i].length;
ss.num_sge++;
}
/* Check for invalid packet size. */
if (len > dev->dd->ipath_ibmtu) {
ret = -EINVAL;
goto bail;
}
extra_bytes = (4 - len) & 3;
nwords = (len + extra_bytes) >> 2;
/* Construct the header. */
ah_attr = &to_iah(wr->wr.ud.ah)->attr;
if (ah_attr->dlid == 0) {
ret = -EINVAL;
goto bail;
}
if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) {
if (ah_attr->dlid != IPATH_PERMISSIVE_LID)
dev->n_multicast_xmit++;
else
dev->n_unicast_xmit++;
} else {
dev->n_unicast_xmit++;
lid = ah_attr->dlid &
~((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
if (unlikely(lid == dev->dd->ipath_lid)) {
/*
* Pass in an uninitialized ib_wc to save stack
* space.
*/
ipath_ud_loopback(qp, &ss, len, wr, &wc);
goto done;
}
}
if (ah_attr->ah_flags & IB_AH_GRH) {
/* Header size in 32-bit words. */
hwords = 17;
lrh0 = IPATH_LRH_GRH;
ohdr = &qp->s_hdr.u.l.oth;
qp->s_hdr.u.l.grh.version_tclass_flow =
cpu_to_be32((6 << 28) |
(ah_attr->grh.traffic_class << 20) |
ah_attr->grh.flow_label);
qp->s_hdr.u.l.grh.paylen =
cpu_to_be16(((wr->opcode ==
IB_WR_SEND_WITH_IMM ? 6 : 5) +
nwords + SIZE_OF_CRC) << 2);
/* next_hdr is defined by C8-7 in ch. 8.4.1 */
qp->s_hdr.u.l.grh.next_hdr = 0x1B;
qp->s_hdr.u.l.grh.hop_limit = ah_attr->grh.hop_limit;
/* The SGID is 32-bit aligned. */
qp->s_hdr.u.l.grh.sgid.global.subnet_prefix =
dev->gid_prefix;
qp->s_hdr.u.l.grh.sgid.global.interface_id =
dev->dd->ipath_guid;
qp->s_hdr.u.l.grh.dgid = ah_attr->grh.dgid;
/*
* 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. */
hwords = 7;
lrh0 = IPATH_LRH_BTH;
ohdr = &qp->s_hdr.u.oth;
}
if (wr->opcode == IB_WR_SEND_WITH_IMM) {
ohdr->u.ud.imm_data = wr->imm_data;
wc.imm_data = wr->imm_data;
hwords += 1;
bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
} else if (wr->opcode == IB_WR_SEND) {
wc.imm_data = 0;
bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
} else {
ret = -EINVAL;
goto bail;
}
lrh0 |= ah_attr->sl << 4;
if (qp->ibqp.qp_type == IB_QPT_SMI)
lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */
qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC);
lid = dev->dd->ipath_lid;
if (lid) {
lid |= ah_attr->src_path_bits &
((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
qp->s_hdr.lrh[3] = cpu_to_be16(lid);
} else
qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE;
if (wr->send_flags & IB_SEND_SOLICITED)
bth0 |= 1 << 23;
bth0 |= extra_bytes << 20;
bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY :
ipath_get_pkey(dev->dd, 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] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
ah_attr->dlid != IPATH_PERMISSIVE_LID ?
__constant_cpu_to_be32(IPATH_MULTICAST_QPN) :
cpu_to_be32(wr->wr.ud.remote_qpn);
/* XXX Could lose a PSN count but not worth locking */
ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_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)wr->wr.ud.remote_qkey < 0 ?
qp->qkey : wr->wr.ud.remote_qkey);
ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
if (ipath_verbs_send(dev->dd, hwords, (u32 *) &qp->s_hdr,
len, &ss))
dev->n_no_piobuf++;
done:
/* Queue the completion status entry. */
if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
(wr->send_flags & IB_SEND_SIGNALED)) {
wc.wr_id = wr->wr_id;
wc.status = IB_WC_SUCCESS;
wc.vendor_err = 0;
wc.opcode = IB_WC_SEND;
wc.byte_len = len;
wc.qp = &qp->ibqp;
wc.src_qp = 0;
wc.wc_flags = 0;
/* XXX initialize other fields? */
ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
}
kfree(sg_list);
ret = 0;
bail:
return ret;
}
/**
* ipath_ud_rcv - receive an incoming UD packet
* @dev: the device 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 ipath_qp_rcv() to process an incoming UD packet
* for the given QP.
* Called at interrupt level.
*/
void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
{
struct ipath_other_headers *ohdr;
int opcode;
u32 hdrsize;
u32 pad;
struct ib_wc wc;
u32 qkey;
u32 src_qp;
u16 dlid;
int header_in_data;
/* Check for GRH */
if (!has_grh) {
ohdr = &hdr->u.oth;
hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */
qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
header_in_data = 0;
} else {
ohdr = &hdr->u.l.oth;
hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
/*
* The header with GRH is 68 bytes and the core driver sets
* the eager header buffer size to 56 bytes so the last 12
* bytes of the IB header is in the data buffer.
*/
header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
if (header_in_data) {
qkey = be32_to_cpu(((__be32 *) data)[1]);
src_qp = be32_to_cpu(((__be32 *) data)[2]);
data += 12;
} else {
qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
}
}
src_qp &= IPATH_QPN_MASK;
/*
* 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)) {
dev->n_pkt_drops++;
goto bail;
}
if (unlikely(qkey != qp->qkey)) {
/* XXX OK to lose a count once in a while. */
dev->qkey_violations++;
dev->n_pkt_drops++;
goto bail;
}
} else if (hdr->lrh[1] == IB_LID_PERMISSIVE ||
hdr->lrh[3] == IB_LID_PERMISSIVE) {
struct ib_smp *smp = (struct ib_smp *) data;
if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
dev->n_pkt_drops++;
goto bail;
}
}
/* Get the number of bytes the message was padded by. */
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
if (unlikely(tlen < (hdrsize + pad + 4))) {
/* Drop incomplete packets. */
dev->n_pkt_drops++;
goto bail;
}
tlen -= hdrsize + pad + 4;
/* Drop invalid MAD packets (see 13.5.3.1). */
if (unlikely((qp->ibqp.qp_num == 0 &&
(tlen != 256 ||
(be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) ||
(qp->ibqp.qp_num == 1 &&
(tlen != 256 ||
(be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) {
dev->n_pkt_drops++;
goto bail;
}
/*
* A GRH is expected to preceed the data even if not
* present on the wire.
*/
wc.byte_len = tlen + sizeof(struct ib_grh);
/*
* 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) {
if (header_in_data) {
wc.imm_data = *(__be32 *) data;
data += sizeof(__be32);
} else
wc.imm_data = ohdr->u.ud.imm_data;
wc.wc_flags = IB_WC_WITH_IMM;
hdrsize += sizeof(u32);
} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
wc.imm_data = 0;
wc.wc_flags = 0;
} else {
dev->n_pkt_drops++;
goto bail;
}
/*
* Get the next work request entry to find where to put the data.
*/
if (qp->r_reuse_sge)
qp->r_reuse_sge = 0;
else if (!ipath_get_rwqe(qp, 0)) {
/*
* Count VL15 packets dropped due to no receive buffer.
* Otherwise, count them as buffer overruns since usually,
* the HW will be able to receive packets even if there are
* no QPs with posted receive buffers.
*/
if (qp->ibqp.qp_num == 0)
dev->n_vl15_dropped++;
else
dev->rcv_errors++;
goto bail;
}
/* Silently drop packets which are too big. */
if (wc.byte_len > qp->r_len) {
qp->r_reuse_sge = 1;
dev->n_pkt_drops++;
goto bail;
}
if (has_grh) {
ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh,
sizeof(struct ib_grh));
wc.wc_flags |= IB_WC_GRH;
} else
ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh));
ipath_copy_sge(&qp->r_sge, data,
wc.byte_len - sizeof(struct ib_grh));
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;
/* XXX do we know which pkey matched? Only needed for GSI. */
wc.pkey_index = 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 >= IPATH_MULTICAST_LID_BASE ? 0 :
dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
/* Signal completion event if the solicited bit is set. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
(ohdr->bth[0] &
__constant_cpu_to_be32(1 << 23)) != 0);
bail:;
}
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