netdev - Re: [PATCH net-next 7/8] net/mlx5e: XDP TX forwarding support

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Message-ID: <20160920154036.GA98644@ast-mbp.thefacebook.com>
Date:   Tue, 20 Sep 2016 08:40:37 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Tariq Toukan <ttoukan.linux@...il.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Rana Shahout <ranas@...lanox.com>
Subject: Re: [PATCH net-next 7/8] net/mlx5e: XDP TX forwarding support

On Tue, Sep 20, 2016 at 03:53:10PM +0300, Tariq Toukan wrote:
> >>>+	case XDP_ABORTED:
> >>It is not clearly defined, but I believe XDP_ABORTED should also result
> >>in a warning (calling bpf_warn_invalid_xdp_action(act)).
> I'll add this.

Certainly NOT.
XDP_ABORTED is an exception case when program does divide by zero.
It should NOT do bpf_warn. It must drop the packet.
We discussed it several months ago.
See mlx4/en_rx.c for canonical implementation.