Skip to content
Snippets Groups Projects
  1. Dec 09, 2020
  2. Dec 08, 2020
  3. Dec 07, 2020
  4. Dec 06, 2020
    • Vladimir Oltean's avatar
      net: mscc: ocelot: fix dropping of unknown IPv4 multicast on Seville · edd2410b
      Vladimir Oltean authored
      
      The current assumption is that the felix DSA driver has flooding knobs
      per traffic class, while ocelot switchdev has a single flooding knob.
      This was correct for felix VSC9959 and ocelot VSC7514, but with the
      introduction of seville VSC9953, we see a switch driven by felix.c which
      has a single flooding knob.
      
      So it is clear that we must do what should have been done from the
      beginning, which is not to overwrite the configuration done by ocelot.c
      in felix, but instead to teach the common ocelot library about the
      differences in our switches, and set up the flooding PGIDs centrally.
      
      The effect that the bogus iteration through FELIX_NUM_TC has upon
      seville is quite dramatic. ANA_FLOODING is located at 0x00b548, and
      ANA_FLOODING_IPMC is located at 0x00b54c. So the bogus iteration will
      actually overwrite ANA_FLOODING_IPMC when attempting to write
      ANA_FLOODING[1]. There is no ANA_FLOODING[1] in sevile, just ANA_FLOODING.
      
      And when ANA_FLOODING_IPMC is overwritten with a bogus value, the effect
      is that ANA_FLOODING_IPMC gets the value of 0x0003CF7D:
      	MC6_DATA = 61,
      	MC6_CTRL = 61,
      	MC4_DATA = 60,
      	MC4_CTRL = 0.
      Because MC4_CTRL is zero, this means that IPv4 multicast control packets
      are not flooded, but dropped. An invalid configuration, and this is how
      the issue was actually spotted.
      
      Reported-by: default avatarEldar Gasanov <eldargasanov2@gmail.com>
      Reported-by: default avatarMaxim Kochetkov <fido_max@inbox.ru>
      Tested-by: default avatarEldar Gasanov <eldargasanov2@gmail.com>
      Fixes: 84705fc1 ("net: dsa: felix: introduce support for Seville VSC9953 switch")
      Fixes: 3c7b51bd ("net: dsa: felix: allow flooding for all traffic classes")
      Signed-off-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
      Reviewed-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
      Link: https://lore.kernel.org/r/20201204175416.1445937-1-vladimir.oltean@nxp.com
      
      
      Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      edd2410b
  5. Dec 05, 2020
  6. Dec 04, 2020
  7. Dec 03, 2020
Loading