stmmac: reset last TSO segment size after device open

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[ Upstream commit 45ab4b13e4 ]

The mss variable tracks the last max segment size sent to the TSO
engine. We do not update the hardware as long as we receive skb:s with
the same value in gso_size.

During a network device down/up cycle (mapped to stmmac_release() and
stmmac_open() callbacks) we issue a reset to the hardware and it
forgets the setting for mss. However we did not zero out our mss
variable so the next transmission of a gso packet happens with an
undefined hardware setting.

This triggers a hang in the TSO engine and eventuelly the netdev
watchdog will bark.

Fixes: f748be531d ("stmmac: support new GMAC4")
Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Lars Persson 2017-12-01 11:12:44 +01:00 • committed by Greg Kroah-Hartman

parent 6878a06356

commit 8b01623c73

1 changed files with 1 additions and 0 deletions

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drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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