svcrdma: Find rmsgp more reliably

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xdr_start() can return the wrong rmsgp address if an assumption
about how the xdr_buf was constructed changes.  When it gets it
wrong, the client receives a reply that has gibberish in the
RPC/RDMA header, preventing it from matching a waiting RPC request.

Instead, make (and document) just one assumption: that the RDMA
header for the client's RPC call is at the start of the first page
in rq_pages.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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Chuck Lever 2015-01-13 11:03:11 -05:00 • committed by J. Bruce Fields

parent 3fe04ee9f9

commit e5523bd281

1 changed files with 4 additions and 14 deletions

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net/sunrpc/xprtrdma/svc_rdma_sendto.c

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