xprtrdma: Move credit update to RPC reply handler

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Reduce work in the receive CQ handler, which can be run at hardware
interrupt level, by moving the RPC/RDMA credit update logic to the
RPC reply handler.

This has some additional benefits: More header sanity checking is
done before trusting the incoming credit value, and the receive CQ
handler no longer touches the RPC/RDMA header (the CPU stalls while
waiting for the header contents to be brought into the cache).

This further extends work begun by commit e7ce710a88 ("xprtrdma:
Avoid deadlock when credit window is reset").

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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This commit is contained in:

Chuck Lever 2015-01-21 11:03:02 -05:00 • committed by Anna Schumaker

parent 3eb3581066

commit eba8ff660b

3 changed files with 10 additions and 16 deletions

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10

net/sunrpc/xprtrdma/rpc_rdma.c

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15

net/sunrpc/xprtrdma/verbs.c

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1

net/sunrpc/xprtrdma/xprt_rdma.h

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