netdev - Re: [PATCH bpf-next 2/7] drivers: net: turn on XDP features

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Message-ID: <20230123120318.358ef9a8@kernel.org>
Date:   Mon, 23 Jan 2023 12:03:18 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        hawk@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
        toke@...hat.com, memxor@...il.com, alardam@...il.com,
        saeedm@...dia.com, anthony.l.nguyen@...el.com, gospo@...adcom.com,
        vladimir.oltean@....com, nbd@....name, john@...ozen.org,
        leon@...nel.org, simon.horman@...igine.com, aelior@...vell.com,
        christophe.jaillet@...adoo.fr, ecree.xilinx@...il.com,
        mst@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, intel-wired-lan@...ts.osuosl.org,
        lorenzo.bianconi@...hat.com, niklas.soderlund@...igine.com
Subject: Re: [PATCH bpf-next 2/7] drivers: net: turn on XDP features

On Sun, 22 Jan 2023 12:49:20 +0100 Lorenzo Bianconi wrote:
> > Shouldn't these generate netlink notifications?  
> 
> ack, I would say we need to add NETDEV_XDP_FEAT_CHANGE case in
> netdev_genl_netdevice_event routine and maybe add a new
> NETDEV_XDP_FEAT_CHANGE flag in netdev_cmd. What do you think?

No strong preference between a full event or just a direct call until
we have another in-kernel user interested in the notification.
The changes are wrapped nicely in helpers, so we can change it later
easily.