netdev - Re: [PATCH] net: hsr: Use correct offset for HSR TLV values in supervisory HSR frames

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Message-ID: <ZdyzgHtizHlVS2vn@nanopsycho>
Date: Mon, 26 Feb 2024 16:51:28 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Lukasz Majewski <lukma@...x.de>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	Tristram.Ha@...rochip.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH] net: hsr: Use correct offset for HSR TLV values in
 supervisory HSR frames

Mon, Feb 26, 2024 at 04:24:47PM CET, lukma@...x.de wrote:
>Current HSR implementation uses following supervisory frame (even for
>HSRv1 the HSR tag is not is not present):
>
>00000000: 01 15 4e 00 01 2d XX YY ZZ 94 77 10 88 fb 00 01
>00000010: 7e 1c 17 06 XX YY ZZ 94 77 10 1e 06 XX YY ZZ 94
>00000020: 77 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>00000030: 00 00 00 00 00 00 00 00 00 00 00 00
>
>The current code adds extra two bytes (i.e. sizeof(struct hsr_sup_tlv))
>when offset for skb_pull() is calculated.
>This is wrong, as both 'struct hsrv1_ethhdr_sp' and 'hsrv0_ethhdr_sp'
>already have 'struct hsr_sup_tag' defined in them, so there is no need
>for adding extra two bytes.
>
>This code was working correctly as with no RedBox support, the check for
>HSR_TLV_EOT (0x00) was off by two bytes, which were corresponding to
>zeroed padded bytes for minimal packet size.
>
>Fixes: f43200a2c98b ("net: hsr: Provide RedBox support")
>

No need for this empty line.

>Signed-off-by: Lukasz Majewski <lukma@...x.de>

Reviewed-by: Jiri Pirko <jiri@...dia.com>