Re: [PATCH v1 3/8] net: dsa: hellcreek: Add PTP clock support

Kurt Kanzenbach
2020-07-13T06:34:06Z

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On Sat Jul 11 2020, Florian Fainelli wrote:
> On 7/10/2020 4:36 AM, Kurt Kanzenbach wrote:
>> From: Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>
>>
>> The switch has internal PTP hardware clocks. Add support for it. There are three
>> clocks:
>>
>> * Synchronized
>> * Syntonized
>> * Free running
>>
>> Currently the synchronized clock is exported to user space which is a good
>> default for the beginning. The free running clock might be exported later
>> e.g. for implementing 802.1AS-2011/2020 Time Aware Bridges (TAB). The switch
>> also supports cross time stamping for that purpose.
>>
>> The implementation adds support setting/getting the time as well as offset and
>> frequency adjustments. However, the clock only holds a partial timeofday
>> timestamp. This is why we track the seconds completely in software (see overflow
>> work and last_ts).
>>
>> Furthermore, add the PTP multicast addresses into the FDB to forward that
>> packages only to the CPU port where they are processed by a PTP program.
>>
>> Signed-off-by: Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>
>> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
>
> Are not you missing an depends on PTP_1588_CLOCK somewhere?

Most likely. Thanks!

>
>> ---
>
> [snip]
>
>>
>> +static int hellcreek_setup_fdb(struct hellcreek *hellcreek)
>> +{
>> + static struct hellcreek_fdb_entry ptp = {
>> + /* MAC: 01-1B-19-00-00-00 */
>> + .mac = { 0x01, 0x1b, 0x19, 0x00, 0x00, 0x00 },
>> + .portmask = 0x03, /* Management ports */
>
> Should not this depend on the actual number of ports enabled by the user
> and so it would be more logical to program those entries (or update
> them) at port_enable() time?

For me this is a switch configuration. It means forward all PTP traffic
to the switch's CPU port and therefore it doesn't depend on the enabled
ports.

Thanks,
Kurt

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