1. 10 Jun, 2019 9 commits
  2. 09 Jun, 2019 29 commits
  3. 08 Jun, 2019 2 commits
    • David S. Miller's avatar
      Merge branch 'PTP-support-for-the-SJA1105-DSA-driver' · 8d94a873
      David S. Miller authored
      Vladimir Oltean says:
      
      ====================
      PTP support for the SJA1105 DSA driver
      
      This patchset adds the following:
      
       - A timecounter/cyclecounter based PHC for the free-running
         timestamping clock of this switch.
      
       - A state machine implemented in the DSA tagger for SJA1105, which
         keeps track of metadata follow-up Ethernet frames (the switch's way
         of transmitting RX timestamps).
      
      Clock manipulations on the actual hardware PTP clock will have to be
      implemented anyway, for the TTEthernet block and the time-based ingress
      policer.
      
      v3 patchset can be found at:
      https://lkml.org/lkml/2019/6/4/954
      
      Changes from v3:
      
      - Made it compile with the SJA1105 DSA driver and PTP driver as modules.
      
      - Reworked/simplified/fixed some issues in 03/17
        (dsa_8021q_remove_header) and added an ASCII image that
        illustrates the transformation that is taking place.
      
      - Removed a useless check for sja1105_is_link_local from 16/17 (RX
        timestamping) which also made previous 08/17 patch ("Move
        sja1105_is_link_local to include/linux") useless and therefore dropped.
      
      v2 patchset can be found at:
      https://lkml.org/lkml/2019/6/2/146
      
      Changes from v2:
      
      - Broke previous 09/10 patch (timestamping) into multiple smaller
        patches.
      
      - Every patch in the series compiles.
      
      v1 patchset can be found at:
      https://lkml.org/lkml/2019/5/28/1093
      
      Changes from v1:
      
      - Removed the addition of the DSA .can_timestamp callback.
      
      - Waiting for meta frames is done completely inside the tagger, and all
        frames emitted on RX are already partially timestamped.
      
      - Added a global data structure for the tagger common to all ports.
      
      - Made PTP work with ports in standalone mode, by limiting use of the
        DMAC-mangling "incl_srcpt" mode only when ports are bridged, aka when
        the DSA master is already promiscuous and can receive anything.
        Also changed meta frames to be sent at the 01-80-C2-00-00-0E DMAC.
      
      - Made some progress w.r.t. observed negative path delay.  Apparently it
        only appears when the delay mechanism is the delay request-response
        (end-to-end) one. If peer delay is used (-P), the path delay is
        positive and appears reasonable for an 1000Base-T link (485 ns in
        steady state).
      
        SJA1105 as PTP slave (OC) with E2E path delay:
      
      ptp4l[55.600]: master offset          8 s2 freq  +83677 path delay     -2390
      ptp4l[56.600]: master offset         17 s2 freq  +83688 path delay     -2391
      ptp4l[57.601]: master offset          6 s2 freq  +83682 path delay     -2391
      ptp4l[58.601]: master offset         -1 s2 freq  +83677 path delay     -2391
      
        SJA1105 as PTP slave (OC) with P2P path delay:
      
      ptp4l[48.343]: master offset          5 s2 freq  +83715 path delay       484
      ptp4l[48.468]: master offset         -3 s2 freq  +83705 path delay       485
      ptp4l[48.593]: master offset          0 s2 freq  +83708 path delay       485
      ptp4l[48.718]: master offset          1 s2 freq  +83710 path delay       485
      ptp4l[48.844]: master offset          1 s2 freq  +83710 path delay       485
      ptp4l[48.969]: master offset         -5 s2 freq  +83702 path delay       485
      ptp4l[49.094]: master offset          3 s2 freq  +83712 path delay       485
      ptp4l[49.219]: master offset          4 s2 freq  +83714 path delay       485
      ptp4l[49.344]: master offset         -5 s2 freq  +83702 path delay       485
      ptp4l[49.469]: master offset          3 s2 freq  +83713 path delay       487
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d94a873
    • Vladimir Oltean's avatar
      net: dsa: sja1105: Expose PTP timestamping ioctls to userspace · a602afd2
      Vladimir Oltean authored
      This enables the PTP support towards userspace applications such as
      linuxptp.
      
      The switches can timestamp only trapped multicast MAC frames, and
      therefore only the profiles of 1588 over L2 are supported.
      
      TX timestamping can be enabled per port, but RX timestamping is enabled
      globally. As long as RX timestamping is enabled, the switch will emit
      metadata follow-up frames that will be processed by the tagger. It may
      be a problem that linuxptp does not restore the RX timestamping settings
      when exiting.
      Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a602afd2