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VLAN filtering cannot be properly disabled in SJA1105. So in order to emulate the "no VLAN awareness" behavior (not dropping traffic that is tagged with a VID that isn't configured on the port), we need to hack another switch feature: programmable TPID (which is 0x8100 for 802.1Q). We are reprogramming the TPID to a bogus value which leaves the switch thinking that all traffic is untagged, and therefore accepts it. Under a vlan_filtering bridge, the proper TPID of ETH_P_8021Q is installed again, and the switch starts identifying 802.1Q-tagged traffic. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
24 lines
736 B
C
24 lines
736 B
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
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*/
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/* Included by drivers/net/dsa/sja1105/sja1105.h */
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#ifndef _NET_DSA_SJA1105_H
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#define _NET_DSA_SJA1105_H
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#include <linux/etherdevice.h>
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#define ETH_P_SJA1105 ETH_P_DSA_8021Q
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/* The switch can only be convinced to stay in unmanaged mode and not trap any
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* link-local traffic by actually telling it to filter frames sent at the
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* 00:00:00:00:00:00 destination MAC.
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*/
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#define SJA1105_LINKLOCAL_FILTER_A 0x000000000000ull
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#define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFFFFFFFFull
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#define SJA1105_LINKLOCAL_FILTER_B 0x000000000000ull
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#define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFFFFFFFFull
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#endif /* _NET_DSA_SJA1105_H */
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