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Commit 38a8fc0f authored by Divy Le Ray's avatar Divy Le Ray Committed by David S. Miller
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cxgb3: FIx VLAN over Jumbo frames 



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: default avatarDivy Le Ray <divy@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d41a5b7d

drivers/net/cxgb3/xgmac.c

+3 −0
Original line number Diff line number Diff line
@@ -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);