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svcrdma: Simplify svc_rdma_send()

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Clean up: No current caller of svc_rdma_send's passes in a chained
WR. The logic that counts the chain length can be replaced with a
constant (1).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2018-05-07 15:28:20 -04:00 committed by J. Bruce Fields
parent 986b78894b
commit 3abb03face
1 changed files with 15 additions and 15 deletions
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28
net/sunrpc/xprtrdma/svc_rdma_sendto.c
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@ -253,40 +253,40 @@ static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
svc_xprt_put(&rdma->sc_xprt);
}
/**
* svc_rdma_send - Post a single Send WR
* @rdma: transport on which to post the WR
* @wr: prepared Send WR to post
*
* Returns zero the Send WR was posted successfully. Otherwise, a
* negative errno is returned.
*/
int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr)
{
struct ib_send_wr *bad_wr, *n_wr;
int wr_count;
int i;
struct ib_send_wr *bad_wr;
int ret;
wr_count = 1;
for (n_wr = wr->next; n_wr; n_wr = n_wr->next)
wr_count++;
might_sleep();
/* If the SQ is full, wait until an SQ entry is available */
while (1) {
if ((atomic_sub_return(wr_count, &rdma->sc_sq_avail) < 0)) {
if ((atomic_dec_return(&rdma->sc_sq_avail) < 0)) {
atomic_inc(&rdma_stat_sq_starve);
trace_svcrdma_sq_full(rdma);
atomic_add(wr_count, &rdma->sc_sq_avail);
atomic_inc(&rdma->sc_sq_avail);
wait_event(rdma->sc_send_wait,
atomic_read(&rdma->sc_sq_avail) > wr_count);
atomic_read(&rdma->sc_sq_avail) > 1);
if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))
return -ENOTCONN;
trace_svcrdma_sq_retry(rdma);
continue;
}
/* Take a transport ref for each WR posted */
for (i = 0; i < wr_count; i++)
svc_xprt_get(&rdma->sc_xprt);
/* Bump used SQ WR count and post */
svc_xprt_get(&rdma->sc_xprt);
ret = ib_post_send(rdma->sc_qp, wr, &bad_wr);
trace_svcrdma_post_send(wr, ret);
if (ret) {
set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
for (i = 0; i < wr_count; i++)
svc_xprt_put(&rdma->sc_xprt);
wake_up(&rdma->sc_send_wait);
}