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

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Date:	Thu, 4 Dec 2014 09:57:43 -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 03:33:06PM +0100, Jiri Pirko wrote:
> Thu, Dec 04, 2014 at 03:20:15PM CET, gospo@...ulusnetworks.com wrote:
> >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.
> 
> well ovs is all about flows and has the "switch" word in the name. I
> believe that people are talking about "switches" in case of these "flow
> devices" as well. I see nothing wrong in that. I think that "switch"
> became generic name for "packet forwarding machines".

Just because one chose to use it that way does not mean I agree with it
and that we should copy their bad decision.  :-)

> "parent" is very generic and may mean 100 things...

But in this case, it means 1 thing.  The netdev you are using is
connected to another device that controls it rather than being just a
NIC.

> 
> 
> >- I wanted to combine this for use with SR-IOV use case, so one can more
> >  easily map PF->VF using this.
> 
> Ugh, please don't mix this up with pf, vf. That is completely different
> thing.
> 
> pf vf mapping is done in sysfs. In netlink, physportid is used for that
> purpose. We can expose this phys port id for pf as well (as a different
> attr) and we are done.

I know that attribute is there, but I find it more valuable for
solutions like nPAR than for PF/VF use-case.  Parent/child relationship
makes more sense to me since for forwarding will be controlled by the
embedded switch on those devices.  (Notice I specifically chose not to
use 'master' since that is already overloaded by bridge, bonding,
teaming, etc.)

> 
> >
> >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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