netdev - Re: [PATCH bpf] xdp: Handle device unregister for devmap

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Message-ID: <CAEf4BzbshfC2VXXbnWnjCA=Mcz8OSO=ACNSRNrNr2mHOm9uCmw@mail.gmail.com>
Date:   Thu, 17 Oct 2019 12:17:01 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: [PATCH bpf] xdp: Handle device unregister for devmap_hash map type

On Wed, Oct 16, 2019 at 9:07 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> It seems I forgot to add handling of devmap_hash type maps to the device
> unregister hook for devmaps. This omission causes devices to not be
> properly released, which causes hangs.
>
> Fix this by adding the missing handler.
>
> Fixes: 6f9d451ab1a3 ("xdp: Add devmap_hash map type for looking up devices by hashed index")
> Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> ---
>  kernel/bpf/devmap.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>

[...]

> +
> +               while (dev) {
> +                       odev = (netdev == dev->dev) ? dev : NULL;
> +                       dev = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(&dev->index_hlist)),

Please run scripts/checkpatch.pl, this looks like a rather long line.

> +                                              struct bpf_dtab_netdev,
> +                                              index_hlist);

[...]