Messages in this thread | | | Subject | Re: [PATCH v2 net-next 09/15] net: dsa: tag_8021q: support up to 8 VLANs per port using sub-VLANs | From | Florian Fainelli <> | Date | Mon, 11 May 2020 20:35:38 -0700 |
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On 5/11/2020 6:53 AM, Vladimir Oltean wrote: > From: Vladimir Oltean <vladimir.oltean@nxp.com> > > For switches that support VLAN retagging, such as sja1105, we extend > dsa_8021q by encoding a "sub-VLAN" into the remaining 3 free bits in the > dsa_8021q tag. > > A sub-VLAN is nothing more than a number in the range 0-7, which serves > as an index into a per-port driver lookup table. The sub-VLAN value of > zero means that traffic is untagged (this is also backwards-compatible > with dsa_8021q without retagging). > > The switch should be configured to retag VLAN-tagged traffic that gets > transmitted towards the CPU port (and towards the CPU only). Example: > > bridge vlan add dev sw1p0 vid 100 > > The switch retags frames received on port 0, going to the CPU, and > having VID 100, to the VID of 1104 (0x0450). In dsa_8021q language: > > | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | > +-----------+-----+-----------------+-----------+-----------------------+ > | DIR | SVL | SWITCH_ID | SUBVLAN | PORT | > +-----------+-----+-----------------+-----------+-----------------------+ > > 0x0450 means: > - DIR = 0b01: this is an RX VLAN > - SUBVLAN = 0b001: this is subvlan #1 > - SWITCH_ID = 0b001: this is switch 1 (see the name "sw1p0") > - PORT = 0b0000: this is port 0 (see the name "sw1p0") > > The driver also remembers the "1 -> 100" mapping. In the hotpath, if the > sub-VLAN from the tag encodes a non-untagged frame, this mapping is used > to create a VLAN hwaccel tag, with the value of 100. > > Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> -- Florian
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