Yo Jacob E!
On Thu, 26 Feb 2015 18:11:06 +0000
"Keller, Jacob E" <jacob.e.kel...@intel.com> wrote:
> The absolute minimum
>
> HWTSTAMP_TX_ON for Transmit timestamps
>
> and
>
> HWTSTAMP_FILTER_V2_L4_SYNC if you are a slave in L4 (ipv4 or ipv6)
> mode. You would never be able to support master.
>
> HWTSTAMP_FILTER_V2_L4_DELAY_REQ if you are a master, in L4, never able
> to be a slave.
>
> (swap those for L2 if you are in L2 mode)
>
> This wouldn't work with P2P delay model, because those are yet another
> type of packet you'd have to Rx timestamp.
>
> The "best" minimal answer is "HWTSTAMP_FILTER_V2_EVENT"
>
> Almost all hardware supports some form of V2_EVENT, and honestly I
> wouldn't suggest hardware that does not support V2_EVENT, as it
> requires ptp4l to reconfigure timestamp mode upon state change from
> master to slave if you can't support the generic V2_EVENT.
Hmm, clearly a swamp. Somebody should be collecting a list of
known working cards...
And I am confused again. See below for my I210.
kong linuxptp # ethtool -T eth1
Time stamping parameters for eth1:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 1
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
Does HWTSTAMP_FILTER_ALL implicitly include HWTSTAMP_V2_EVENT,
HWTSTAMP_FILTER_V2_L4_SYNC, HWTSTAMP_FILTER_V2_L4_DELAY_REQ?
RGDS
GARY
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g...@rellim.com Tel:+1(541)382-8588
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