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Commit 90358cb0 authored by Jan Hoffmann's avatar Jan Hoffmann Committed by Greg Kroah-Hartman
Browse files

net: dsa: lantiq_gswip: fix maximum frame length 



commit 552799f8b3b0074d2617f53a63a088f9514a66e3 upstream.

Currently, outgoing packets larger than 1496 bytes are dropped when
tagged VLAN is used on a switch port.

Add the frame check sequence length to the value of the register
GSWIP_MAC_FLEN to fix this. This matches the lantiq_ppa vendor driver,
which uses a value consisting of 1518 bytes for the MAC frame, plus the
lengths of special tag and VLAN tags.

Fixes: 14fceff4 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJan Hoffmann <jan@3e8.eu>
Acked-by: default avatarHauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c1f12f44

drivers/net/dsa/lantiq_gswip.c

+2 −1
Original line number Diff line number Diff line
@@ -837,7 +837,8 @@ static int gswip_setup(struct dsa_switch *ds) 


	gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN,

			  GSWIP_MAC_CTRL_2p(cpu_port));

	gswip_switch_w(priv, VLAN_ETH_FRAME_LEN + 8, GSWIP_MAC_FLEN);

	gswip_switch_w(priv, VLAN_ETH_FRAME_LEN + 8 + ETH_FCS_LEN,

		       GSWIP_MAC_FLEN);

	gswip_switch_mask(priv, 0, GSWIP_BM_QUEUE_GCTRL_GL_MOD,

			  GSWIP_BM_QUEUE_GCTRL);