tree 5a55fdc7b2d013effdf0fdd7c5e4217deb754e16
parent 5f46feab87bb105d6a217d966b327fdc56696802
author Michael Chan <michael.chan@broadcom.com> 1462922279 -0400
committer David S. Miller <davem@davemloft.net> 1463024769 -0400

bnxt_en: Add workaround to detect bad opaque in rx completion (part 1)

There is a rare hardware bug that can cause a bad opaque value in the RX
or TPA completion.  When this happens, the hardware may have used the
same buffer twice for 2 rx packets.  In addition, the driver will also
crash later using the bad opaque as the index into the ring.

The rx opaque value is predictable and is always monotonically increasing.
The workaround is to keep track of the expected next opaque value and
compare it with the one returned by hardware during RX and TPA start
completions.  If they miscompare, we will not process any more RX and
TPA completions and exit NAPI.  We will then schedule a workqueue to
reset the function.

This patch adds the logic to keep track of the next rx consumer index.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>