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stmmac: reset last TSO segment size after device open

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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: f748be531d70 ("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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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) {