From: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Date: Tue, 11 Jan 2011 01:42:22 +0000 (-0800)
Subject: IB/qib: Issue pre-emptive NAKs on eager buffer overflow
X-Git-Tag: v2.6.38-rc1~406^2^7~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=994bcd28a36af1413381dfe0aac065e2cbc2af40;p=pandora-kernel.git

IB/qib: Issue pre-emptive NAKs on eager buffer overflow

Under congestion resulting in eager buffer overflow attempt to send
pre-emptive NAKs if header queue entries with TID errors are generated
and a valid header is present.  This prevents long timeouts and flow
restarts if a trailing set of packets are dropped due to eager
overflows.  Pre-emptive NAKs are currently only supported for RDMA
writes.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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