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svcrdma: Add a batch Receive posting mechanism

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Introduce a server-side mechanism similar to commit e340c2d6ef
("xprtrdma: Reduce the doorbell rate (Receive)") to post Receive
WRs in batch. Its first consumer is svc_rdma_post_recvs(), which
posts the initial set of Receive WRs.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2021-03-11 13:54:34 -05:00
parent c6b7ed8f94
commit 77f0a2aa5c
1 changed files with 42 additions and 14 deletions
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56
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
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@@ -264,6 +264,47 @@ void svc_rdma_release_rqst(struct svc_rqst *rqstp)
svc_rdma_recv_ctxt_put(rdma, ctxt); svc_rdma_recv_ctxt_put(rdma, ctxt);
} }
static bool svc_rdma_refresh_recvs(struct svcxprt_rdma *rdma,
unsigned int wanted, bool temp)
{
const struct ib_recv_wr *bad_wr = NULL;
struct svc_rdma_recv_ctxt *ctxt;
struct ib_recv_wr *recv_chain;
int ret;
if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))
return false;
recv_chain = NULL;
while (wanted--) {
ctxt = svc_rdma_recv_ctxt_get(rdma);
if (!ctxt)
break;
trace_svcrdma_post_recv(ctxt);
ctxt->rc_temp = temp;
ctxt->rc_recv_wr.next = recv_chain;
recv_chain = &ctxt->rc_recv_wr;
}
if (!recv_chain)
return false;
ret = ib_post_recv(rdma->sc_qp, recv_chain, &bad_wr);
if (ret)
goto err_free;
return true;
err_free:
trace_svcrdma_rq_post_err(rdma, ret);
while (bad_wr) {
ctxt = container_of(bad_wr, struct svc_rdma_recv_ctxt,
rc_recv_wr);
bad_wr = bad_wr->next;
svc_rdma_recv_ctxt_put(rdma, ctxt);
}
return false;
}
static int __svc_rdma_post_recv(struct svcxprt_rdma *rdma, static int __svc_rdma_post_recv(struct svcxprt_rdma *rdma,
struct svc_rdma_recv_ctxt *ctxt) struct svc_rdma_recv_ctxt *ctxt)
{ {
@@ -301,20 +342,7 @@ static int svc_rdma_post_recv(struct svcxprt_rdma *rdma)
*/ */
bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma) bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma)
{ {
struct svc_rdma_recv_ctxt *ctxt; return svc_rdma_refresh_recvs(rdma, rdma->sc_max_requests, true);
unsigned int i;
int ret;
for (i = 0; i < rdma->sc_max_requests; i++) {
ctxt = svc_rdma_recv_ctxt_get(rdma);
if (!ctxt)
return false;
ctxt->rc_temp = true;
ret = __svc_rdma_post_recv(rdma, ctxt);
if (ret)
return false;
}
return true;
} }
/** /**