xprtrdma: Provide a buffer to pad Write chunks of unaligned length

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This is a buffer to be left persistently registered while a
connection is up. Connection tear-down will automatically DMA-unmap,
invalidate, and dereg the MR. A persistently registered buffer is
lower in cost to provide, and it can never be coalesced into the
RDMA segment that carries the data payload.

An RPC that provisions a Write chunk with a non-aligned length now
uses this MR rather than the tail buffer of the RPC's rq_rcv_buf.

Reviewed-By: Tom Talpey <tom@talpey.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

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This commit is contained in:

Chuck Lever 2021-10-05 10:17:59 -04:00 • committed by Trond Myklebust

parent d5f458a979

commit 21037b8c22

5 changed files with 65 additions and 12 deletions

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13

include/trace/events/rpcrdma.h

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35

net/sunrpc/xprtrdma/frwr_ops.c

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23

net/sunrpc/xprtrdma/rpc_rdma.c

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1

net/sunrpc/xprtrdma/verbs.c

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5

net/sunrpc/xprtrdma/xprt_rdma.h

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