tree 26f4685a39d94dbfbab346862061ef6f577653f2
parent 2a600f14d25fda341b5633c75cc50a7574fc1007
author Mike Marciniszyn <mike.marciniszyn@qlogic.com> 1294710142 -0800
committer Roland Dreier <rolandd@cisco.com> 1294710142 -0800

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>