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

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Message-ID: <20141204142015.GR27416@gospo.rtplab.test>
Date:	Thu, 4 Dec 2014 09:20:15 -0500
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
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,
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	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
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Subject: Re: [patch iproute2 1/6] iproute2: ipa: show switch id

On Thu, Dec 04, 2014 at 09:57:13AM +0100, Jiri Pirko wrote:
> 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,

Serious question for Stephen et al, once we take this to iproute2 are we
going to be able to change the name but the string diplayed if needed?

I had a patch that called this IFLA_PARENT_ID that I was using with the
older github tree used by Jiri and Scott before these were in net-next.
I wanted to submit that as a change to what became
82f2841291cfaf4d225aa1766424280254d3e3b2, but was waiting for things to
be accepted and the dust settled.

I like the parent/child/sibling nomenclature better for 4 reasons:

- Most did not seem to like the term 'offload' since that term would be
  confusing with, GRO, GSO, etc.
- A *significant* use case for many of the high-end ASICs in datacenters
  is routing.
- switchid does not make sense in the OVS/flow case because it is all
  about flows, not switches or routers, and parent made sense there.
- I wanted to combine this for use with SR-IOV use case, so one can more
  easily map PF->VF using this.

Can you give me a bit (a day) to clean-up that patch and submit an
alternative proposal to these?

>  	__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]));
>  
> -- 
> 1.9.3
> 
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