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

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Date:   Tue, 17 Oct 2017 04:21:24 -0700
From:   Eric Dumazet <edumazet@...gle.com>
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>,
        Alexander Duyck <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>,
        Jesus Sanchez-Palencia <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>