netdev - Re: [PATCH net v2 7/8] net/mlx5e: take into account device reconfiguration for xdp

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Date:   Wed, 15 Mar 2023 17:29:32 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        saeedm@...dia.com, leon@...nel.org, shayagr@...zon.com,
        akiyano@...zon.com, darinzon@...zon.com, sgoutham@...vell.com,
        lorenzo.bianconi@...hat.com, toke@...hat.com, teknoraver@...a.com,
        ttoukan.linux@...il.com
Subject: Re: [PATCH net v2 7/8] net/mlx5e: take into account device
 reconfiguration for xdp_features flag

On Wed, 15 Mar 2023 16:39:00 -0700 Jakub Kicinski wrote:
> diff --git a/net/core/xdp.c b/net/core/xdp.c
> index 87e654b7d06c..5722a1fc6e9e 100644
> --- a/net/core/xdp.c
> +++ b/net/core/xdp.c
> @@ -781,6 +781,9 @@ void xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
>                 return;
>  
>         dev->xdp_features = val;
> +
> +       if (dev->reg_state < NETREG_REGISTERED)
> +               return;
>         call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
>  }
>  EXPORT_SYMBOL_GPL(xdp_set_features_flag);
> 
> ? The notifiers are not needed until the device is actually live.

I think so.. let me send a full patch.