netdev - Re: [PATCH bpf-next 03/12] net: Add IFLA_XDP_EGRESS for XDP programs in the egress path

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Message-ID: <335b624a-655a-c0c6-ca27-102e6dac790b@gmail.com>
Date:   Thu, 23 Jan 2020 14:33:42 -0700
From:   David Ahern <dsahern@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Cc:     prashantbhole.linux@...il.com, jasowang@...hat.com,
        davem@...emloft.net, jbrouer@...hat.com, mst@...hat.com,
        toshiaki.makita1@...il.com, daniel@...earbox.net,
        john.fastabend@...il.com, ast@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com,
        David Ahern <dahern@...italocean.com>
Subject: Re: [PATCH bpf-next 03/12] net: Add IFLA_XDP_EGRESS for XDP programs
 in the egress path

On 1/23/20 4:35 AM, Toke Høiland-Jørgensen wrote:
> David Ahern <dsahern@...nel.org> writes:
> 
>> From: David Ahern <dahern@...italocean.com>
>>
>> Add IFLA_XDP_EGRESS to if_link.h uapi to handle an XDP program attached
>> to the egress path of a device. Add rtnl_xdp_egress_fill and helpers as
>> the egress counterpart to the existing rtnl_xdp_fill. The expectation
>> is that going forward egress path will acquire the various levels of
>> attach - generic, driver and hardware.
> 
> How would a 'hardware' attach work for this? As I said in my reply to
> the previous patch, isn't this explicitly for emulating XDP on the other
> end of a point-to-point link? How would that work with offloaded
> programs?
> 
> -Toke
> 

Nothing about this patch set is limited to point-to-point links.