linux-kernel - Re: [RFC PATCH 3/7] tun: allow use of BPF_PROG_TYPE_SCHED

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Date:   Tue, 12 Jan 2021 11:46:46 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yuri Benditovich <yuri.benditovich@...nix.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Willem de Bruijn <willemb@...gle.com>, gustavoars@...nel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        nogikh@...gle.com, Pablo Neira Ayuso <pablo@...filter.org>,
        decui@...rosoft.com, cai@....pw,
        Jakub Sitnicki <jakub@...udflare.com>,
        Marco Elver <elver@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        bpf <bpf@...r.kernel.org>, Yan Vugenfirer <yan@...nix.com>
Subject: Re: [RFC PATCH 3/7] tun: allow use of BPF_PROG_TYPE_SCHED_CLS program type

On Tue, Jan 12, 2021 at 11:42 AM Yuri Benditovich
<yuri.benditovich@...nix.com> wrote:
>
> This program type can set skb hash value. It will be useful
> when the tun will support hash reporting feature if virtio-net.
>
> Signed-off-by: Yuri Benditovich <yuri.benditovich@...nix.com>
> ---
>  drivers/net/tun.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 7959b5c2d11f..455f7afc1f36 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -2981,6 +2981,8 @@ static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog __rcu **prog_p,
>                 prog = NULL;
>         } else {
>                 prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
> +               if (IS_ERR(prog))
> +                       prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SCHED_CLS);

You've ignored the feedback and just resend? what for?