> Um, unless I'm mistaken, this is unneeded, because you can specify a
> VLAN interface just like a normal interface. In the kernel, the VLAN
> interface stacks on top of the physical one and passes the time
> stamping APIs through.
It seems that it is true if you create VLAN interface on top of “hardware”
interface (the one that support PTP):
$ 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: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
$ ip -j link show vlan1 | jq '.[] | .link’
“eth1"
$ ethtool -T vlan1
Time stamping parameters for vlan1:
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: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
However in a bit more complex network configuration when your VLAN interface is
created on top of bridge that includes “hardware” interface your VLAN interface
doesn’t support same timestamping capabilities as “hardware” interface,
obviously:
$ ip -j link show vlan1 | jq '.[] | .link’
“br1”
$ ip -j link show eth1 | jq '.[] | .master'
"br1"
$ ethtool -T vlan1
Time stamping parameters for vlan1:
Capabilities:
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
PTP Hardware Clock: none
Hardware Transmit Timestamp Modes: none
Hardware Receive Filter Modes: none
Regard,
Zaripov Kamil_______________________________________________
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