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xprtrdma: Move credit update to RPC reply handler
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 e7ce710 ("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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