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

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Date:	Thu, 04 Dec 2014 10:15:04 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, tgraf@...g.ch, dborkman@...hat.com,
	ogerlitz@...lanox.com, jesse@...ira.com, pshelar@...ira.com,
	azhou@...ira.com, ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...il.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
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	nicolas.dichtel@...nd.com, ryazanov.s.a@...il.com,
	buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org,
	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
	ronye@...lanox.com, simon.horman@...ronome.com,
	alexander.h.duyck@...hat.com, john.ronciak@...el.com,
	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org, hemal@...adcom.com
Subject: Re: [patch iproute2 1/6] iproute2: ipa: show switch id

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).

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.

> 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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