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. This depends upon the "FDB updates for SJA1105 DSA driver" series at: https://patchwork.ozlabs.org/project/netdev/list/?series=111354&state=* 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 Vladimir Oltean (10): net: dsa: Keep a pointer to the skb clone for TX timestamping net: dsa: Add teardown callback for drivers net: dsa: tag_8021q: Create helper function for removing VLAN header net: dsa: sja1105: Move sja1105_change_tpid into sja1105_vlan_filtering net: dsa: sja1105: Limit use of incl_srcpt to bridge+vlan mode net: dsa: sja1105: Add support for the PTP clock net: dsa: sja1105: Move sja1105_is_link_local to include/linux net: dsa: sja1105: Make sja1105_is_link_local not match meta frames net: dsa: sja1105: Add support for PTP timestamping net: dsa: sja1105: Increase priority of CPU-trapped frames drivers/net/dsa/sja1105/Kconfig | 7 + drivers/net/dsa/sja1105/Makefile | 1 + drivers/net/dsa/sja1105/sja1105.h | 29 ++ .../net/dsa/sja1105/sja1105_dynamic_config.c | 2 + drivers/net/dsa/sja1105/sja1105_main.c | 317 ++++++++++++-- drivers/net/dsa/sja1105/sja1105_ptp.c | 392 ++++++++++++++++++ drivers/net/dsa/sja1105/sja1105_ptp.h | 64 +++ drivers/net/dsa/sja1105/sja1105_spi.c | 33 ++ .../net/dsa/sja1105/sja1105_static_config.c | 59 +++ .../net/dsa/sja1105/sja1105_static_config.h | 10 + include/linux/dsa/8021q.h | 7 + include/linux/dsa/sja1105.h | 51 +++ include/net/dsa.h | 1 + net/dsa/dsa2.c | 3 + net/dsa/slave.c | 3 + net/dsa/tag_8021q.c | 15 + net/dsa/tag_sja1105.c | 203 ++++++++- 17 files changed, 1150 insertions(+), 47 deletions(-) create mode 100644 drivers/net/dsa/sja1105/sja1105_ptp.c create mode 100644 drivers/net/dsa/sja1105/sja1105_ptp.h -- 2.17.1
