netdev - Re: [PATCH bpf-next 3/3] bpf, netns: Keep a list of attached bpf

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Date:   Mon, 22 Jun 2020 23:26:40 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team@...udflare.com
Subject: Re: [PATCH bpf-next 3/3] bpf, netns: Keep a list of attached bpf_link's

On Mon, Jun 22, 2020 at 9:04 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> To support multi-prog link-based attachments for new netns attach types, we
> need to keep track of more than one bpf_link per attach type. Hence,
> convert net->bpf.links into a list, that currently can be either empty or
> have just one item.
>
> Instead of reusing bpf_prog_list from bpf-cgroup, we link together
> bpf_netns_link's themselves. This makes list management simpler as we don't
> have to allocate, initialize, and later release list elements. We can do
> this because multi-prog attachment will be available only for bpf_link, and
> we don't need to build a list of programs attached directly and indirectly
> via links.
>
> No functional changes intended.
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  include/net/netns/bpf.h    |  2 +-
>  kernel/bpf/net_namespace.c | 42 +++++++++++++++++++++-----------------
>  2 files changed, 24 insertions(+), 20 deletions(-)
>

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