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svcrdma: Maintain a Receive water mark

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Post more Receives when the number of pending Receives drops below
a water mark. The batch mechanism is disabled if the underlying
device cannot support a reasonably-sized Receive Queue.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2021-03-11 18:32:30 -05:00
parent 7b748c30cc
commit c558d47596
3 changed files with 14 additions and 3 deletions
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10
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@@ -285,6 +285,7 @@ static bool svc_rdma_refresh_recvs(struct svcxprt_rdma *rdma,
ctxt->rc_temp = temp;
ctxt->rc_recv_wr.next = recv_chain;
recv_chain = &ctxt->rc_recv_wr;
rdma->sc_pending_recvs++;
}
if (!recv_chain)
return false;
@@ -302,6 +303,8 @@ err_free:
bad_wr = bad_wr->next;
svc_rdma_recv_ctxt_put(rdma, ctxt);
}
/* Since we're destroying the xprt, no need to reset
* sc_pending_recvs. */
return false;
}
@@ -328,6 +331,8 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
struct ib_cqe *cqe = wc->wr_cqe;
struct svc_rdma_recv_ctxt *ctxt;
rdma->sc_pending_recvs--;
/* WARNING: Only wc->wr_cqe and wc->status are reliable */
ctxt = container_of(cqe, struct svc_rdma_recv_ctxt, rc_cqe);
@@ -344,8 +349,9 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
* to reduce the likelihood of replayed requests once the
* client reconnects.
*/
if (!svc_rdma_refresh_recvs(rdma, 1, false))
goto flushed;
if (rdma->sc_pending_recvs < rdma->sc_max_requests)
if (!svc_rdma_refresh_recvs(rdma, rdma->sc_recv_batch, false))
goto flushed;
/* All wc fields are now known to be valid */
ctxt->rc_byte_len = wc->byte_len;