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| author |   Vladimir Oltean <olteanv@gmail.com> | 2019-05-02 23:23:34 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-05-03 10:49:17 -0400 |
| commit | 6666cebc5e306f49a25bd20aa8c1cb8ef8950df5 (patch) | |
| tree | feac9879b812fff6394bba7c875007002847a759 /arch | |
| parent | ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging (diff) | |
| download | linux-dev-6666cebc5e306f49a25bd20aa8c1cb8ef8950df5.tar.xz linux-dev-6666cebc5e306f49a25bd20aa8c1cb8ef8950df5.zip | |
net: dsa: sja1105: Add support for VLAN operations
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>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions