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linux-sg2042/drivers/infiniband/sw/rxe/rxe_req.c

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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, 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 <linux/skbuff.h>
#include <crypto/hash.h>
#include "rxe.h"
#include "rxe_loc.h"
#include "rxe_queue.h"
static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
u32 opcode);
static inline void retry_first_write_send(struct rxe_qp *qp,
struct rxe_send_wqe *wqe,
unsigned int mask, int npsn)
{
int i;
for (i = 0; i < npsn; i++) {
int to_send = (wqe->dma.resid > qp->mtu) ?
qp->mtu : wqe->dma.resid;
qp->req.opcode = next_opcode(qp, wqe,
wqe->wr.opcode);
if (wqe->wr.send_flags & IB_SEND_INLINE) {
wqe->dma.resid -= to_send;
wqe->dma.sge_offset += to_send;
} else {
advance_dma_data(&wqe->dma, to_send);
}
if (mask & WR_WRITE_MASK)
wqe->iova += qp->mtu;
}
}
static void req_retry(struct rxe_qp *qp)
{
struct rxe_send_wqe *wqe;
unsigned int wqe_index;
unsigned int mask;
int npsn;
int first = 1;
qp->req.wqe_index = consumer_index(qp->sq.queue);
qp->req.psn = qp->comp.psn;
qp->req.opcode = -1;
for (wqe_index = consumer_index(qp->sq.queue);
wqe_index != producer_index(qp->sq.queue);
wqe_index = next_index(qp->sq.queue, wqe_index)) {
wqe = addr_from_index(qp->sq.queue, wqe_index);
mask = wr_opcode_mask(wqe->wr.opcode, qp);
if (wqe->state == wqe_state_posted)
break;
if (wqe->state == wqe_state_done)
continue;
wqe->iova = (mask & WR_ATOMIC_MASK) ?
wqe->wr.wr.atomic.remote_addr :
(mask & WR_READ_OR_WRITE_MASK) ?
wqe->wr.wr.rdma.remote_addr :
0;
if (!first || (mask & WR_READ_MASK) == 0) {
wqe->dma.resid = wqe->dma.length;
wqe->dma.cur_sge = 0;
wqe->dma.sge_offset = 0;
}
if (first) {
first = 0;
if (mask & WR_WRITE_OR_SEND_MASK) {
npsn = (qp->comp.psn - wqe->first_psn) &
BTH_PSN_MASK;
retry_first_write_send(qp, wqe, mask, npsn);
}
if (mask & WR_READ_MASK) {
npsn = (wqe->dma.length - wqe->dma.resid) /
qp->mtu;
wqe->iova += npsn * qp->mtu;
}
}
wqe->state = wqe_state_posted;
}
}
void rnr_nak_timer(struct timer_list *t)
{
struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer);
pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp));
rxe_run_task(&qp->req.task, 1);
}
static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)
{
struct rxe_send_wqe *wqe = queue_head(qp->sq.queue);
unsigned long flags;
if (unlikely(qp->req.state == QP_STATE_DRAIN)) {
/* check to see if we are drained;
* state_lock used by requester and completer
*/
spin_lock_irqsave(&qp->state_lock, flags);
do {
if (qp->req.state != QP_STATE_DRAIN) {
/* comp just finished */
spin_unlock_irqrestore(&qp->state_lock,
flags);
break;
}
if (wqe && ((qp->req.wqe_index !=
consumer_index(qp->sq.queue)) ||
(wqe->state != wqe_state_posted))) {
/* comp not done yet */
spin_unlock_irqrestore(&qp->state_lock,
flags);
break;
}
qp->req.state = QP_STATE_DRAINED;
spin_unlock_irqrestore(&qp->state_lock, flags);
if (qp->ibqp.event_handler) {
struct ib_event ev;
ev.device = qp->ibqp.device;
ev.element.qp = &qp->ibqp;
ev.event = IB_EVENT_SQ_DRAINED;
qp->ibqp.event_handler(&ev,
qp->ibqp.qp_context);
}
} while (0);
}
if (qp->req.wqe_index == producer_index(qp->sq.queue))
return NULL;
wqe = addr_from_index(qp->sq.queue, qp->req.wqe_index);
if (unlikely((qp->req.state == QP_STATE_DRAIN ||
qp->req.state == QP_STATE_DRAINED) &&
(wqe->state != wqe_state_processing)))
return NULL;
if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) &&
(qp->req.wqe_index != consumer_index(qp->sq.queue)))) {
qp->req.wait_fence = 1;
return NULL;
}
wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);
return wqe;
}
static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits)
{
switch (opcode) {
case IB_WR_RDMA_WRITE:
if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
return fits ?
IB_OPCODE_RC_RDMA_WRITE_LAST :
IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
else
return fits ?
IB_OPCODE_RC_RDMA_WRITE_ONLY :
IB_OPCODE_RC_RDMA_WRITE_FIRST;
case IB_WR_RDMA_WRITE_WITH_IMM:
if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
return fits ?
IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
else
return fits ?
IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
IB_OPCODE_RC_RDMA_WRITE_FIRST;
case IB_WR_SEND:
if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
return fits ?
IB_OPCODE_RC_SEND_LAST :
IB_OPCODE_RC_SEND_MIDDLE;
else
return fits ?
IB_OPCODE_RC_SEND_ONLY :
IB_OPCODE_RC_SEND_FIRST;
case IB_WR_SEND_WITH_IMM:
if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
return fits ?
IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :
IB_OPCODE_RC_SEND_MIDDLE;
else
return fits ?
IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :
IB_OPCODE_RC_SEND_FIRST;
case IB_WR_RDMA_READ:
return IB_OPCODE_RC_RDMA_READ_REQUEST;
case IB_WR_ATOMIC_CMP_AND_SWP:
return IB_OPCODE_RC_COMPARE_SWAP;
case IB_WR_ATOMIC_FETCH_AND_ADD:
return IB_OPCODE_RC_FETCH_ADD;
case IB_WR_SEND_WITH_INV:
if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :
IB_OPCODE_RC_SEND_MIDDLE;
else
return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :
IB_OPCODE_RC_SEND_FIRST;
case IB_WR_REG_MR:
case IB_WR_LOCAL_INV:
return opcode;
}
return -EINVAL;
}
static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits)
{
switch (opcode) {
case IB_WR_RDMA_WRITE:
if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
return fits ?
IB_OPCODE_UC_RDMA_WRITE_LAST :
IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
else
return fits ?
IB_OPCODE_UC_RDMA_WRITE_ONLY :
IB_OPCODE_UC_RDMA_WRITE_FIRST;
case IB_WR_RDMA_WRITE_WITH_IMM:
if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
return fits ?
IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
else
return fits ?
IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
IB_OPCODE_UC_RDMA_WRITE_FIRST;
case IB_WR_SEND:
if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
return fits ?
IB_OPCODE_UC_SEND_LAST :
IB_OPCODE_UC_SEND_MIDDLE;
else
return fits ?
IB_OPCODE_UC_SEND_ONLY :
IB_OPCODE_UC_SEND_FIRST;
case IB_WR_SEND_WITH_IMM:
if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
return fits ?
IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :
IB_OPCODE_UC_SEND_MIDDLE;
else
return fits ?
IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :
IB_OPCODE_UC_SEND_FIRST;
}
return -EINVAL;
}
static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
u32 opcode)
{
int fits = (wqe->dma.resid <= qp->mtu);
switch (qp_type(qp)) {
case IB_QPT_RC:
return next_opcode_rc(qp, opcode, fits);
case IB_QPT_UC:
return next_opcode_uc(qp, opcode, fits);
case IB_QPT_SMI:
case IB_QPT_UD:
case IB_QPT_GSI:
switch (opcode) {
case IB_WR_SEND:
return IB_OPCODE_UD_SEND_ONLY;
case IB_WR_SEND_WITH_IMM:
return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
}
break;
default:
break;
}
return -EINVAL;
}
static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
{
int depth;
if (wqe->has_rd_atomic)
return 0;
qp->req.need_rd_atomic = 1;
depth = atomic_dec_return(&qp->req.rd_atomic);
if (depth >= 0) {
qp->req.need_rd_atomic = 0;
wqe->has_rd_atomic = 1;
return 0;
}
atomic_inc(&qp->req.rd_atomic);
return -EAGAIN;
}
static inline int get_mtu(struct rxe_qp *qp)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))
return qp->mtu;
return rxe->port.mtu_cap;
}
static struct sk_buff *init_req_packet(struct rxe_qp *qp,
struct rxe_send_wqe *wqe,
int opcode, int payload,
struct rxe_pkt_info *pkt)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_port *port = &rxe->port;
struct sk_buff *skb;
struct rxe_send_wr *ibwr = &wqe->wr;
struct rxe_av *av;
int pad = (-payload) & 0x3;
int paylen;
int solicited;
u16 pkey;
u32 qp_num;
int ack_req;
/* length from start of bth to end of icrc */
paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
/* pkt->hdr, rxe, port_num and mask are initialized in ifc
* layer
*/
pkt->opcode = opcode;
pkt->qp = qp;
pkt->psn = qp->req.psn;
pkt->mask = rxe_opcode[opcode].mask;
pkt->paylen = paylen;
pkt->offset = 0;
pkt->wqe = wqe;
/* init skb */
av = rxe_get_av(pkt);
skb = rxe_init_packet(rxe, av, paylen, pkt);
if (unlikely(!skb))
return NULL;
/* init bth */
solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&
(pkt->mask & RXE_END_MASK) &&
((pkt->mask & (RXE_SEND_MASK)) ||
(pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==
(RXE_WRITE_MASK | RXE_IMMDT_MASK));
pkey = (qp_type(qp) == IB_QPT_GSI) ?
port->pkey_tbl[ibwr->wr.ud.pkey_index] :
port->pkey_tbl[qp->attr.pkey_index];
qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :
qp->attr.dest_qp_num;
ack_req = ((pkt->mask & RXE_END_MASK) ||
(qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));
if (ack_req)
qp->req.noack_pkts = 0;
bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num,
ack_req, pkt->psn);
/* init optional headers */
if (pkt->mask & RXE_RETH_MASK) {
reth_set_rkey(pkt, ibwr->wr.rdma.rkey);
reth_set_va(pkt, wqe->iova);
reth_set_len(pkt, wqe->dma.resid);
}
if (pkt->mask & RXE_IMMDT_MASK)
immdt_set_imm(pkt, ibwr->ex.imm_data);
if (pkt->mask & RXE_IETH_MASK)
ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);
if (pkt->mask & RXE_ATMETH_MASK) {
atmeth_set_va(pkt, wqe->iova);
if (opcode == IB_OPCODE_RC_COMPARE_SWAP ||
opcode == IB_OPCODE_RD_COMPARE_SWAP) {
atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);
atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);
} else {
atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);
}
atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);
}
if (pkt->mask & RXE_DETH_MASK) {
if (qp->ibqp.qp_num == 1)
deth_set_qkey(pkt, GSI_QKEY);
else
deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);
deth_set_sqp(pkt, qp->ibqp.qp_num);
}
return skb;
}
static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
struct rxe_pkt_info *pkt, struct sk_buff *skb,
int paylen)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
u32 crc = 0;
u32 *p;
int err;
err = rxe_prepare(pkt, skb, &crc);
if (err)
return err;
if (pkt->mask & RXE_WRITE_OR_SEND) {
if (wqe->wr.send_flags & IB_SEND_INLINE) {
u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
crc = rxe_crc32(rxe, crc, tmp, paylen);
memcpy(payload_addr(pkt), tmp, paylen);
wqe->dma.resid -= paylen;
wqe->dma.sge_offset += paylen;
} else {
err = copy_data(qp->pd, 0, &wqe->dma,
payload_addr(pkt), paylen,
from_mem_obj,
&crc);
if (err)
return err;
}
}
p = payload_addr(pkt) + paylen + bth_pad(pkt);
*p = ~crc;
return 0;
}
static void update_wqe_state(struct rxe_qp *qp,
struct rxe_send_wqe *wqe,
struct rxe_pkt_info *pkt)
{
if (pkt->mask & RXE_END_MASK) {
if (qp_type(qp) == IB_QPT_RC)
wqe->state = wqe_state_pending;
} else {
wqe->state = wqe_state_processing;
}
}
static void update_wqe_psn(struct rxe_qp *qp,
struct rxe_send_wqe *wqe,
struct rxe_pkt_info *pkt,
int payload)
{
/* number of packets left to send including current one */
int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;
/* handle zero length packet case */
if (num_pkt == 0)
num_pkt = 1;
if (pkt->mask & RXE_START_MASK) {
wqe->first_psn = qp->req.psn;
wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;
}
if (pkt->mask & RXE_READ_MASK)
qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;
else
qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
}
static void save_state(struct rxe_send_wqe *wqe,
struct rxe_qp *qp,
struct rxe_send_wqe *rollback_wqe,
u32 *rollback_psn)
{
rollback_wqe->state = wqe->state;
rollback_wqe->first_psn = wqe->first_psn;
rollback_wqe->last_psn = wqe->last_psn;
*rollback_psn = qp->req.psn;
}
static void rollback_state(struct rxe_send_wqe *wqe,
struct rxe_qp *qp,
struct rxe_send_wqe *rollback_wqe,
u32 rollback_psn)
{
wqe->state = rollback_wqe->state;
wqe->first_psn = rollback_wqe->first_psn;
wqe->last_psn = rollback_wqe->last_psn;
qp->req.psn = rollback_psn;
}
static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
struct rxe_pkt_info *pkt, int payload)
{
qp->req.opcode = pkt->opcode;
if (pkt->mask & RXE_END_MASK)
qp->req.wqe_index = next_index(qp->sq.queue, qp->req.wqe_index);
qp->need_req_skb = 0;
if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))
mod_timer(&qp->retrans_timer,
jiffies + qp->qp_timeout_jiffies);
}
int rxe_requester(void *arg)
{
struct rxe_qp *qp = (struct rxe_qp *)arg;
struct rxe_pkt_info pkt;
struct sk_buff *skb;
struct rxe_send_wqe *wqe;
enum rxe_hdr_mask mask;
int payload;
int mtu;
int opcode;
int ret;
struct rxe_send_wqe rollback_wqe;
u32 rollback_psn;
rxe_add_ref(qp);
next_wqe:
if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
goto exit;
if (unlikely(qp->req.state == QP_STATE_RESET)) {
qp->req.wqe_index = consumer_index(qp->sq.queue);
qp->req.opcode = -1;
qp->req.need_rd_atomic = 0;
qp->req.wait_psn = 0;
qp->req.need_retry = 0;
goto exit;
}
if (unlikely(qp->req.need_retry)) {
req_retry(qp);
qp->req.need_retry = 0;
}
wqe = req_next_wqe(qp);
if (unlikely(!wqe))
goto exit;
if (wqe->mask & WR_REG_MASK) {
if (wqe->wr.opcode == IB_WR_LOCAL_INV) {
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_mem *rmr;
rmr = rxe_pool_get_index(&rxe->mr_pool,
wqe->wr.ex.invalidate_rkey >> 8);
if (!rmr) {
pr_err("No mr for key %#x\n",
wqe->wr.ex.invalidate_rkey);
wqe->state = wqe_state_error;
wqe->status = IB_WC_MW_BIND_ERR;
goto exit;
}
rmr->state = RXE_MEM_STATE_FREE;
rxe_drop_ref(rmr);
wqe->state = wqe_state_done;
wqe->status = IB_WC_SUCCESS;
} else if (wqe->wr.opcode == IB_WR_REG_MR) {
struct rxe_mem *rmr = to_rmr(wqe->wr.wr.reg.mr);
rmr->state = RXE_MEM_STATE_VALID;
rmr->access = wqe->wr.wr.reg.access;
rmr->lkey = wqe->wr.wr.reg.key;
rmr->rkey = wqe->wr.wr.reg.key;
rmr->iova = wqe->wr.wr.reg.mr->iova;
wqe->state = wqe_state_done;
wqe->status = IB_WC_SUCCESS;
} else {
goto exit;
}
if ((wqe->wr.send_flags & IB_SEND_SIGNALED) ||
qp->sq_sig_type == IB_SIGNAL_ALL_WR)
rxe_run_task(&qp->comp.task, 1);
qp->req.wqe_index = next_index(qp->sq.queue,
qp->req.wqe_index);
goto next_wqe;
}
if (unlikely(qp_type(qp) == IB_QPT_RC &&
qp->req.psn > (qp->comp.psn + RXE_MAX_UNACKED_PSNS))) {
qp->req.wait_psn = 1;
goto exit;
}
/* Limit the number of inflight SKBs per QP */
if (unlikely(atomic_read(&qp->skb_out) >
RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {
qp->need_req_skb = 1;
goto exit;
}
opcode = next_opcode(qp, wqe, wqe->wr.opcode);
if (unlikely(opcode < 0)) {
wqe->status = IB_WC_LOC_QP_OP_ERR;
goto exit;
}
mask = rxe_opcode[opcode].mask;
if (unlikely(mask & RXE_READ_OR_ATOMIC)) {
if (check_init_depth(qp, wqe))
goto exit;
}
mtu = get_mtu(qp);
payload = (mask & RXE_WRITE_OR_SEND) ? wqe->dma.resid : 0;
if (payload > mtu) {
if (qp_type(qp) == IB_QPT_UD) {
/* C10-93.1.1: If the total sum of all the buffer lengths specified for a
* UD message exceeds the MTU of the port as returned by QueryHCA, the CI
* shall not emit any packets for this message. Further, the CI shall not
* generate an error due to this condition.
*/
/* fake a successful UD send */
wqe->first_psn = qp->req.psn;
wqe->last_psn = qp->req.psn;
qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;
qp->req.wqe_index = next_index(qp->sq.queue,
qp->req.wqe_index);
wqe->state = wqe_state_done;
wqe->status = IB_WC_SUCCESS;
__rxe_do_task(&qp->comp.task);
rxe_drop_ref(qp);
return 0;
}
payload = mtu;
}
skb = init_req_packet(qp, wqe, opcode, payload, &pkt);
if (unlikely(!skb)) {
pr_err("qp#%d Failed allocating skb\n", qp_num(qp));
goto err;
}
if (fill_packet(qp, wqe, &pkt, skb, payload)) {
pr_debug("qp#%d Error during fill packet\n", qp_num(qp));
kfree_skb(skb);
goto err;
}
/*
* To prevent a race on wqe access between requester and completer,
* wqe members state and psn need to be set before calling
* rxe_xmit_packet().
* Otherwise, completer might initiate an unjustified retry flow.
*/
save_state(wqe, qp, &rollback_wqe, &rollback_psn);
update_wqe_state(qp, wqe, &pkt);
update_wqe_psn(qp, wqe, &pkt, payload);
ret = rxe_xmit_packet(qp, &pkt, skb);
if (ret) {
qp->need_req_skb = 1;
rollback_state(wqe, qp, &rollback_wqe, rollback_psn);
if (ret == -EAGAIN) {
rxe_run_task(&qp->req.task, 1);
goto exit;
}
goto err;
}
update_state(qp, wqe, &pkt, payload);
goto next_wqe;
err:
wqe->status = IB_WC_LOC_PROT_ERR;
wqe->state = wqe_state_error;
__rxe_do_task(&qp->comp.task);
exit:
rxe_drop_ref(qp);
return -EAGAIN;
}
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