netdev - Re: [PATCH v3 net-next 2/5] net: ethernet: mtk_eth

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Message-ID: <5b6d4061bd12a9079e882742c750962816ee6567.camel@redhat.com>
Date:   Tue, 19 Jul 2022 11:22:26 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org
Cc:     nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
        Mark-MC.Lee@...iatek.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, matthias.bgg@...il.com,
        linux-mediatek@...ts.infradead.org, ilias.apalodimas@...aro.org,
        lorenzo.bianconi@...hat.com, jbrouer@...hat.com
Subject: Re: [PATCH v3 net-next 2/5] net: ethernet: mtk_eth_soc: add basic
 XDP support

On Sat, 2022-07-16 at 09:34 +0200, Lorenzo Bianconi wrote:
> Introduce basic XDP support to mtk_eth_soc driver.
> Supported XDP verdicts:
> - XDP_PASS
> - XDP_DROP
> - XDP_REDIRECT
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 147 +++++++++++++++++---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h |   2 +
>  2 files changed, 131 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 9a92d602ebd5..bc3a7dcab207 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -1494,11 +1494,44 @@ static void mtk_rx_put_buff(struct mtk_rx_ring *ring, void *data, bool napi)
>  		skb_free_frag(data);
>  }
>  
> +static u32 mtk_xdp_run(struct mtk_eth *eth, struct mtk_rx_ring *ring,
> +		       struct xdp_buff *xdp, struct net_device *dev)
> +{
> +	struct bpf_prog *prog = rcu_dereference(eth->prog);

It looks like here you need to acquire the RCU read lock. lockdep
should splat otherwise.

/P