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Subject[PATCH v2 net-next 00/10] PTP support for the SJA1105 DSA driver
Date
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

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