netdev - Re: [PATCH bpf 1/7] xdp: remove the xdp_attachment_flags

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Message-ID: <20201203174217.7717ea84@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date:   Thu, 3 Dec 2020 17:42:17 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Romain Perier <romain.perier@...il.com>,
        Allen Pais <apais@...ux.microsoft.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Simon Horman <simon.horman@...ronome.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Jiri Benc <jbenc@...hat.com>, oss-drivers@...ronome.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf 1/7] xdp: remove the xdp_attachment_flags_ok()
 callback

On Thu, 03 Dec 2020 22:35:18 +0100 Toke Høiland-Jørgensen wrote:
> Since we offloaded and non-offloaded programs can co-exist there doesn't
> really seem to be any reason for the check anyway, and it's only used in
> three drivers so let's just get rid of the callback entirely.

I don't remember exactly now, but I think the concern was that using 
the unspecified mode is pretty ambiguous when interface has multiple
programs attached.