• Vladimir Oltean's avatar
    net: dsa: add a second tagger for Ocelot switches based on tag_8021q · 7c83a7c5
    Vladimir Oltean authored
    There are use cases for which the existing tagger, based on the NPI
    (Node Processor Interface) functionality, is insufficient.
    
    Namely:
    - Frames injected through the NPI port bypass the frame analyzer, so no
      source address learning is performed, no TSN stream classification,
      etc.
    - Flow control is not functional over an NPI port (PAUSE frames are
      encapsulated in the same Extraction Frame Header as all other frames)
    - There can be at most one NPI port configured for an Ocelot switch. But
      in NXP LS1028A and T1040 there are two Ethernet CPU ports. The non-NPI
      port is currently either disabled, or operated as a plain user port
      (albeit an internally-facing one). Having the ability to configure the
      two CPU ports symmetrically could pave the way for e.g. creating a LAG
      between them, to increase bandwidth seamlessly for the system.
    
    So there is a desire to have an alternative to the NPI mode. This change
    keeps the default tagger for the Seville and Felix switches as "ocelot",
    but it can be changed via the following device attribute:
    
    echo ocelot-8021q > /sys/class/<dsa-master>/dsa/tagging
    Signed-off-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
    Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
    Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
    7c83a7c5
Kconfig 5.35 KB