netdev - Re: [PATCH net] net: xdp: don't call notifiers during driver init

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Message-ID: <20230316145942.6e67e405@kernel.org>
Date:   Thu, 16 Mar 2023 14:59:42 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     Tariq Toukan <ttoukan.linux@...il.com>, davem@...emloft.net,
        netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com, tariqt@...dia.com, bpf@...r.kernel.org
Subject: Re: [PATCH net] net: xdp: don't call notifiers during driver init

On Thu, 16 Mar 2023 14:54:18 -0700 Jakub Kicinski wrote:
> > does it make sense to run call_netdevice_notifiers() in xdp_set_features_flag()
> > just if dev->reg_state is NETREG_REGISTERED?  
> 
> I was thinking - we'll adjust it if someone complains, but indeed
> the detection is somewhat weak, a call on a dead device but under
> rtnl_lock won't warn. Let me just copy what the queue helpers do,
> exactly, then.

It's just a notifier, I think I'll go with == REGISTERED.
Let me send v2.