netdev - Re: [PATCH bpf-next] net: xdp: introduce XDP_PACKET_HEADROOM

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Message-ID: <20220321113905.151608c5@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 21 Mar 2022 11:39:05 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, brouer@...hat.com,
        pabeni@...hat.com, toke@...hat.com, andrii@...nel.org, nbd@....name
Subject: Re: [PATCH bpf-next] net: xdp: introduce XDP_PACKET_HEADROOM_MIN
 for veth and generic-xdp

On Mon, 21 Mar 2022 13:17:51 +0100 Lorenzo Bianconi wrote:
> Do you mean set dev->needed_headroom based on XDP_HEADROOM if the device is
> running in xdp mode, right? I guess this is doable for veth, but what is
> the right value for generic-xdp?

#define XDP_PACKET_HEADROOM	256

What am I missing? :)