netdev - Re: [PATCH iwl-next 1/1] igc: Allow hot-swapping XDP program

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Message-ID: <ZztcErmTWW1KjSYq@boxer>
Date: Mon, 18 Nov 2024 16:24:02 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Song Yoong Siang <yoong.siang.song@...el.com>
CC: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, "David S . Miller" <davem@...emloft.net>, "Jakub
 Kicinski" <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
 Fastabend" <john.fastabend@...il.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>, Vinicius Costa Gomes
	<vinicius.gomes@...el.com>, <intel-wired-lan@...ts.osuosl.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<bpf@...r.kernel.org>
Subject: Re: [PATCH iwl-next 1/1] igc: Allow hot-swapping XDP program

On Mon, Nov 18, 2024 at 12:15:45PM +0800, Song Yoong Siang wrote:
> Currently, the driver would always close and reopen the network interface
> when setting/removing the XDP program, regardless of the presence of XDP
> resources. This could cause unnecessary disruptions.
> 
> To avoid this, introduces a check to determine if there is a need to
> close and reopen the interface, allowing for seamless hot-swapping of
> XDP programs.
> 
> Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>

Acked-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> ---
>  drivers/net/ethernet/intel/igc/igc_xdp.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c
> index e27af72aada8..869815f48ac1 100644
> --- a/drivers/net/ethernet/intel/igc/igc_xdp.c
> +++ b/drivers/net/ethernet/intel/igc/igc_xdp.c
> @@ -13,6 +13,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
>  	struct net_device *dev = adapter->netdev;
>  	bool if_running = netif_running(dev);
>  	struct bpf_prog *old_prog;
> +	bool need_update;
>  
>  	if (dev->mtu > ETH_DATA_LEN) {
>  		/* For now, the driver doesn't support XDP functionality with
> @@ -22,7 +23,8 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
>  		return -EOPNOTSUPP;
>  	}
>  
> -	if (if_running)
> +	need_update = !!adapter->xdp_prog != !!prog;
> +	if (if_running && need_update)
>  		igc_close(dev);
>  
>  	old_prog = xchg(&adapter->xdp_prog, prog);
> @@ -34,7 +36,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
>  	else
>  		xdp_features_clear_redirect_target(dev);
>  
> -	if (if_running)
> +	if (if_running && need_update)
>  		igc_open(dev);
>  
>  	return 0;
> -- 
> 2.34.1
> 
>