From: Steve Wise <swise@opengridcomputing.com>
Date: Tue, 23 Sep 2014 22:11:22 +0000 (-0500)
Subject: svcrdma: advertise the correct max payload
X-Git-Tag: fixes-for-v3.18-merge-window~9^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e5be28827bf5c1989218c4b7bf64fdbc3d679b5;p=pandora-kernel.git

svcrdma: advertise the correct max payload

Svcrdma currently advertises 1MB, which is too large.  The correct value
is the minimum of RPCSVC_MAXPAYLOAD and the max scatter-gather allowed
in an NFSRDMA IO chunk * the host page size. This bug is usually benign
because the Linux X64 NFSRDMA client correctly limits the payload size to
the correct value (64*4096 = 256KB).  But if the Linux client is PPC64
with a 64KB page size, then the client will indeed use a payload size
that will overflow the server.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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