svcrdma: Post Send WR chain

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Eventually I'd like the server to post the reply's Send WR along
with any Write WRs using only a single call to ib_post_send(), in
order to reduce the NIC's doorbell rate.

To do this, add an anchor for a WR chain to svc_rdma_send_ctxt, and
refactor svc_rdma_send() to post this WR chain to the Send Queue. For
the moment, the posted chain will continue to contain a single Send
WR.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Chuck Lever 2024-02-04 18:17:22 -05:00

parent fc709d82dd

commit 71b43531ee

3 changed files with 38 additions and 19 deletions

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6

include/linux/sunrpc/svc_rdma.h

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2

net/sunrpc/xprtrdma/svc_rdma_backchannel.c

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49

net/sunrpc/xprtrdma/svc_rdma_sendto.c

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