netdev - Re: [patch net-next v2 04/10] net: sched: introduce block mechanism to handle netif_keep

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Message-ID: <20171113001723.089f77ca@cakuba>
Date:   Mon, 13 Nov 2017 00:17:23 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        ast@...nel.org, daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com
Subject: Re: [patch net-next v2 04/10] net: sched: introduce block mechanism
 to handle netif_keep_dst calls

On Mon, 13 Nov 2017 09:08:16 +0100, Jiri Pirko wrote:
> Mon, Nov 13, 2017 at 09:03:34AM CET, jakub.kicinski@...ronome.com wrote:
> >On Mon, 13 Nov 2017 08:58:44 +0100, Jiri Pirko wrote:  
> >> Mon, Nov 13, 2017 at 08:47:26AM CET, jakub.kicinski@...ronome.com wrote:  
> >> >On Sun, 12 Nov 2017 16:55:58 +0100, Jiri Pirko wrote:    
> >> >> From: Jiri Pirko <jiri@...lanox.com>
> >> >> 
> >> >> Couple of classifiers call netif_keep_dst directly on q->dev. That is
> >> >> not possible to do directly for shared blocke where multiple qdiscs are
> >> >> owning the block. So introduce a infrastructure to keep track of the
> >> >> block owners in list and use this list to implement block variant of
> >> >> netif_keep_dst.
> >> >> 
> >> >> Signed-off-by: Jiri Pirko <jiri@...lanox.com>    
> >> >
> >> >Could you use the list you add here to check the ethtool tc offload
> >> >flag? :)    
> >> 
> >> It is a list of qdisc sub parts. Not a list of netdevs  
> >
> >Hm.  OK, I won't pretend I understand the TC code in detail, I thought
> >that would give you all netdevs, but possibly duplicated.  
> 
> Yeah, eventually you can get it. But still, it is unusable to check the
> offload flag cause it has no relation with the block cbs.

OK.  Depends on which flags you intend to check.  I.e. is it OK to
offload filters of the bond, because all its slaves have offloads on
but the bond itself doesn't.  Is that what you mean?