netdev - Re: [patch iproute2 1/6] iproute2: ipa: show switch id

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Message-ID: <20141204163024.GG1861@nanopsycho.orion>
Date:	Thu, 4 Dec 2014 17:30:24 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, tgraf@...g.ch, dborkman@...hat.com,
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Subject: Re: [patch iproute2 1/6] iproute2: ipa: show switch id

Thu, Dec 04, 2014 at 05:15:04PM CET, ebiederm@...ssion.com wrote:
>Jiri Pirko <jiri@...nulli.us> writes:
>
>Would someone please explain to me what a switch id is?
>
>I looked in the kernel source, and I looked here and while I know
>switches I don't have a clue what a switch id is.
>
>My primary concern at this point is that you have introduced a global
>identifier that is isn't a hardware property (it certainly does not look
>like a mac address) and that is unique across network namespaces and
>thus breaks checkpoint/restart (aka CRIU).

IFLA_PHYS_SWITCH_ID is very similar to IFLA_PHYS_PORT_ID. It is
generated by the driver and ensures that there is the same switch id for
all ports belonging to the same switch chip/asic. It is up to the driver
how to implement the id. I would like to point you to driver
implementing ndo_get_phys_port_id

>
>Also what in the world does PHYS mean in IFLA_PHYS_SWITCH_ID?  Does that
>mean we can't have a purely software implementation of this interface?
>Given that we will want a software implementation at some point
>including PHYS in the name seems completely wrong.

We can remove the "PHYS", no problem. I do not understand what you say
about "software implementation". The point is to allow hw switch/ish
chips to be supported.


>
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  include/linux/if_link.h | 1 +
>>  ip/ipaddress.c          | 8 ++++++++
>>  2 files changed, 9 insertions(+)
>>
>> diff --git a/include/linux/if_link.h b/include/linux/if_link.h
>> index 4732063..a6e2594 100644
>> --- a/include/linux/if_link.h
>> +++ b/include/linux/if_link.h
>> @@ -145,6 +145,7 @@ enum {
>>  	IFLA_CARRIER,
>>  	IFLA_PHYS_PORT_ID,
>>  	IFLA_CARRIER_CHANGES,
>> +	IFLA_PHYS_SWITCH_ID,
>>  	__IFLA_MAX
>>  };
>>  
>> diff --git a/ip/ipaddress.c b/ip/ipaddress.c
>> index 4d99324..bd36a07 100644
>> --- a/ip/ipaddress.c
>> +++ b/ip/ipaddress.c
>> @@ -589,6 +589,14 @@ int print_linkinfo(const struct sockaddr_nl *who,
>>  				      b1, sizeof(b1)));
>>  	}
>>  
>> +	if (tb[IFLA_PHYS_SWITCH_ID]) {
>> +		SPRINT_BUF(b1);
>> +		fprintf(fp, "switchid %s ",
>> +			hexstring_n2a(RTA_DATA(tb[IFLA_PHYS_SWITCH_ID]),
>> +				      RTA_PAYLOAD(tb[IFLA_PHYS_SWITCH_ID]),
>> +				      b1, sizeof(b1)));
>> +	}
>> +
>>  	if (tb[IFLA_OPERSTATE])
>>  		print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));
--
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