linux-kernel - RE: [PATCH] net: export netdev_txq_to_tc to allow sch

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Date:   Tue, 17 Oct 2017 14:31:59 +0000
From:   "Duyck, Alexander H" <alexander.h.duyck@...el.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        Henrik Austad <henrik@...tad.us>
CC:     netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsahern@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        John Fastabend <john.fastabend@...il.com>,
        tcharding <me@...in.cc>, LKML <linux-kernel@...r.kernel.org>,
        Henrik Austad <haustad@...co.com>,
        "Sanchez-Palencia, Jesus" <jesus.sanchez-palencia@...el.com>
Subject: RE: [PATCH] net: export netdev_txq_to_tc to allow sch_mqprio to
 compile as module

> -----Original Message-----
> From: Eric Dumazet [mailto:edumazet@...gle.com]
> Sent: Tuesday, October 17, 2017 4:21 AM
> To: Henrik Austad <henrik@...tad.us>
> Cc: netdev <netdev@...r.kernel.org>; David S . Miller
> <davem@...emloft.net>; Daniel Borkmann <daniel@...earbox.net>; David
> Ahern <dsahern@...il.com>; Duyck, Alexander H
> <alexander.h.duyck@...el.com>; Willem de Bruijn <willemb@...gle.com>;
> John Fastabend <john.fastabend@...il.com>; tcharding <me@...in.cc>; LKML
> <linux-kernel@...r.kernel.org>; Henrik Austad <haustad@...co.com>; Sanchez-
> Palencia, Jesus <jesus.sanchez-palencia@...el.com>
> Subject: Re: [PATCH] net: export netdev_txq_to_tc to allow sch_mqprio to
> compile as module
> 
> On Tue, Oct 17, 2017 at 3:10 AM, Henrik Austad <henrik@...tad.us> wrote:
> > In commit 32302902ff09 ("mqprio: Reserve last 32 classid values for HW
> > traffic classes and misc IDs") sch_mqprio started using
> > netdev_txq_to_tc to find the correct tc instead of dev->tc_to_txq[]
> >
> > However, when mqprio is compiled as a module, it cannot resolve the
> > symbol, leading to this error:
> >
> >      ERROR: "netdev_txq_to_tc" [net/sched/sch_mqprio.ko] undefined!
> >
> > This adds an EXPORT_SYMBOL() since the other user in the kernel
> > (netif_set_xps_queue) is also EXPORT_SYMBOL() (and not _GPL) or in a
> > sysfs-callback.
> >
> > Cc: Alexander Duyck <alexander.h.duyck@...el.com>
> > Cc: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
> > Cc: David S. Miller <davem@...emloft.net>
> > Signed-off-by: Henrik Austad <haustad@...co.com>
> 
> 
> Reviewed-by: Eric Dumazet <edumazet@...gle.com>

This is identical to a patch I submitted yesterday when I got the report from the kbuild robot. I would say your description looks much better than mine though so I would be good with dropping my patch in favor of this one.

Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>