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

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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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Mike Marciniszyn 2011-01-10 17:42:22 -08:00 • committed by Roland Dreier

parent 2a600f14d2

commit 994bcd28a3

1 changed files with 137 additions and 4 deletions

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141

drivers/infiniband/hw/qib/qib_driver.c

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