redonkable/alistair23-linux
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cxgb3: FIx VLAN over Jumbo frames

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The mac is expected to auto-inflate the Maximum Frame size for VLAN
tagged frames. It however does not work with jumbo frames.
Work around the bug adding 4 to the Maximum Frame for MTUs
greater than 1536.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Divy Le Ray 2010-02-13 09:44:30 +00:00 committed by David S. Miller
parent d41a5b7da2
commit 38a8fc0fcf
1 changed files with 3 additions and 0 deletions
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3
drivers/net/cxgb3/xgmac.c
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@ -353,6 +353,9 @@ int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
* packet size register includes header, but not FCS.
*/
mtu += 14;
if (mtu > 1536)
mtu += 4;
if (mtu > MAX_FRAME_SIZE - 4)
return -EINVAL;
t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);