linux-kernel - Re: [PATCH v8 net-next 11/15] netfilter: nft_flow_offload: Add DEV_PATH_MTK_WDMA to nft_dev_path

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Message-ID: <350a057e-39ae-4e8d-a4ec-12b2f78f51cb@blackwall.org>
Date: Wed, 5 Mar 2025 10:22:35 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Eric Woudstra <ericwouds@...il.com>,
 Michal Ostrowski <mostrows@...thlink.net>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>, Pablo Neira Ayuso <pablo@...filter.org>,
 Jozsef Kadlecsik <kadlec@...filter.org>, Jiri Pirko <jiri@...nulli.us>,
 Ivan Vecera <ivecera@...hat.com>, Roopa Prabhu <roopa@...dia.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Kuniyuki Iwashima <kuniyu@...zon.com>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Ahmed Zaki <ahmed.zaki@...el.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Vladimir Oltean <olteanv@...il.com>,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 netfilter-devel@...r.kernel.org, coreteam@...filter.org,
 bridge@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-hardening@...r.kernel.org,
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v8 net-next 11/15] netfilter: nft_flow_offload: Add
 DEV_PATH_MTK_WDMA to nft_dev_path_info()

On 2/28/25 22:15, Eric Woudstra wrote:
> In case of using mediatek wireless, in nft_dev_fill_forward_path(), the
> forward path is filled, ending with mediatek wlan1.
> 
> Because DEV_PATH_MTK_WDMA is unknown inside nft_dev_path_info() it returns
> with info.indev = NULL. Then nft_dev_forward_path() returns without
> setting the direct transmit parameters.
> 
> This results in a neighbor transmit, and direct transmit not possible.
> But we want to use it for flow between bridged interfaces.
> 
> So this patch adds DEV_PATH_MTK_WDMA to nft_dev_path_info() and makes
> direct transmission possible.
> 
> Signed-off-by: Eric Woudstra <ericwouds@...il.com>
> ---
>  net/netfilter/nft_flow_offload.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
> index 323c531c7046..b9e6d9e6df66 100644
> --- a/net/netfilter/nft_flow_offload.c
> +++ b/net/netfilter/nft_flow_offload.c
> @@ -105,6 +105,7 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack,
>  		switch (path->type) {
>  		case DEV_PATH_ETHERNET:
>  		case DEV_PATH_DSA:
> +		case DEV_PATH_MTK_WDMA:
>  		case DEV_PATH_VLAN:
>  		case DEV_PATH_PPPOE:
>  			info->indev = path->dev;
> @@ -117,6 +118,10 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack,
>  				i = stack->num_paths;
>  				break;
>  			}
> +			if (path->type == DEV_PATH_MTK_WDMA) {
> +				i = stack->num_paths;
> +				break;
> +			}
>  
>  			/* DEV_PATH_VLAN and DEV_PATH_PPPOE */
>  			if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>