linux-kernel - Re: [PATCH net-next 1/1] net: stmmac: Add support for HW-accelerated VLAN stripping

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Date:   Thu, 9 Nov 2023 17:22:58 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Gan Yi Fang <yi.fang.gan@...el.com>
Cc:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Halaney <ahalaney@...hat.com>,
        Simon Horman <horms@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Shenwei Wang <shenwei.wang@....com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Johannes Zink <j.zink@...gutronix.de>,
        Jochen Henneberg <jh@...neberg-systemdesign.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Looi Hong Aun <hong.aun.looi@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Song Yoong Siang <yoong.siang.song@...el.com>
Subject: Re: [PATCH net-next 1/1] net: stmmac: Add support for HW-accelerated
 VLAN stripping

> +static void dwmac4_rx_hw_vlan(struct mac_device_info *hw,
> +			      struct dma_desc *rx_desc, struct sk_buff *skb)
> +{
> +	if (hw->desc->get_rx_vlan_valid(rx_desc)) {
> +		u16 vid = (u16)hw->desc->get_rx_vlan_tci(rx_desc);
> +
> +		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
> +	}
> +}

> +static inline int dwmac4_wrback_get_rx_vlan_tci(struct dma_desc *p)
> +{
> +	return (le32_to_cpu(p->des0) & RDES0_VLAN_TAG_MASK);
> +}

A tci is a u16. If you make this function return a u16, you can avoid
the cast.

  Andrew