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stmmac: reset last TSO segment size after device open 

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>
This commit is contained in:
Lars Persson 2017-12-01 11:12:44 +01:00 committed by David S. Miller
parent a98a4ebc8c
commit 45ab4b13e4
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -2588,6 +2588,7 @@ static int stmmac_open(struct net_device *dev)
priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
priv->rx_copybreak = STMMAC_RX_COPYBREAK;
priv->mss = 0;
ret = alloc_dma_desc_resources(priv);
if (ret < 0) {