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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
	Alexei Starovoitov <ast@fb.com>, bpf <bpf@vger.kernel.org>,
	Networking <netdev@vger.kernel.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Subject: Re: [PATCH bpf] xdp: Handle device unregister for devmap_hash map type
Date: Thu, 17 Oct 2019 12:17:01 -0700	[thread overview]
Message-ID: <CAEf4BzbshfC2VXXbnWnjCA=Mcz8OSO=ACNSRNrNr2mHOm9uCmw@mail.gmail.com> (raw)
In-Reply-To: <20191016132802.2760149-1-toke@redhat.com>

On Wed, Oct 16, 2019 at 9:07 AM Toke Høiland-Jørgensen <toke@redhat.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@I-love.SAKURA.ne.jp>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.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);

[...]

  parent reply	other threads:[~2019-10-17 19:17 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16 13:28 [PATCH bpf] xdp: Handle device unregister for devmap_hash map type Toke Høiland-Jørgensen
2019-10-16 16:24 ` Martin Lau
2019-10-17 10:27   ` Toke Høiland-Jørgensen
2019-10-16 20:09 ` Tetsuo Handa
2019-10-17 10:28   ` Toke Høiland-Jørgensen
2019-10-17 15:23     ` Alexei Starovoitov
2019-10-17 15:40       ` Toke Høiland-Jørgensen
2019-10-17 19:17 ` Andrii Nakryiko [this message]
2019-10-18 10:31   ` Toke Høiland-Jørgensen
2019-10-18 16:28     ` Andrii Nakryiko

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