netdev - Re: [PATCH net-next v3 2/5] net: dsa: add out-of-band tagging protocol

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Message-ID: <YwpoXpcRickYzD9K@lunn.ch>
Date:   Sat, 27 Aug 2022 20:54:22 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, thomas.petazzoni@...tlin.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v3 2/5] net: dsa: add out-of-band tagging
 protocol

> +struct dsa_oob_tag_info {
> +	u16 proto;
> +	u16 dp;
> +};

> +#define DSA_OOB_TAG_LEN 4
> +
> +int dsa_oob_tag_push(struct sk_buff *skb, struct dsa_oob_tag_info *ti)
> +{
> +	struct dsa_oob_tag_info *tag_info;
> +
> +	tag_info = (struct dsa_oob_tag_info *)skb->head;
> +
> +	tag_info->proto = ti->proto;
> +	tag_info->dp = ti->dp;

Do you need to be worried about alignment here? Is skb->head
guaranteed to be at least 16 bit aligned? I think you would be safer
to use get_unaligned_le16(val, tag);

	Andrew