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From: Andrew Lunn <andrew@lunn.ch>
To: Vladimir Oltean <olteanv@gmail.com>
Cc: Lino Sanfilippo <LinoSanfilippo@gmx.de>,
	woojung.huh@microchip.com, UNGLinuxDriver@microchip.com,
	vivien.didelot@gmail.com, f.fainelli@gmail.com,
	davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] net: dsa: tag_ksz: dont let the hardware process the layer 4 checksum
Date: Thu, 15 Jul 2021 17:50:36 +0200	[thread overview]
Message-ID: <YPBZTFlWwXK/hl95@lunn.ch> (raw)
In-Reply-To: <20210715143648.yutq6vceoblnhhfp@skbuf>

> Tell me more (show me some code).

https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/marvell/mvneta.c#L1747

and

https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/marvell/mvneta.c#L1944

It uses skb_network_offset(skb) to know where the real header is. This
should work independent of DSA or EDSA.

mvpp2_main.c looks to have something similar. The older mv643xx_eth.c
also has something, but it is more subtle. Ah, found it:

https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/marvell/mv643xx_eth.c#L683

> I expect Marvell switches to be equally broken on the Broadcom genet
> controller?

Maybe. Depends on how genet works. A Broadcom switch connected to a
Marvell MAC probably works, since the code is generic. It should work
for any switch which uses head tagging, although mv643xx_eth.c is
limited to 4 or 8 byte tags.

	Andrew

  reply	other threads:[~2021-07-15 15:50 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-14 19:17 [PATCH 0/2] Fixes for KSZ DSA switch Lino Sanfilippo
2021-07-14 19:17 ` [PATCH 1/2] net: dsa: tag_ksz: linearize SKB before adding DSA tag Lino Sanfilippo
2021-07-14 19:17 ` [PATCH 2/2] net: dsa: tag_ksz: dont let the hardware process the layer 4 checksum Lino Sanfilippo
2021-07-14 19:48   ` Vladimir Oltean
2021-07-14 20:15     ` Andrew Lunn
2021-07-15  6:54       ` Vladimir Oltean
2021-07-15 11:16         ` Aw: " Lino Sanfilippo
2021-07-15 11:49           ` Vladimir Oltean
2021-07-15 13:04             ` Aw: " Lino Sanfilippo
2021-07-15 13:12               ` Vladimir Oltean
2021-07-15 13:34                 ` Aw: " Lino Sanfilippo
2021-07-15 13:08         ` Andrew Lunn
2021-07-15 14:36           ` Vladimir Oltean
2021-07-15 15:50             ` Andrew Lunn [this message]
2021-07-19  8:20             ` Aw: " Lino Sanfilippo
2021-07-19  8:24               ` Vladimir Oltean
2021-07-15 16:24           ` Florian Fainelli
2021-07-15 23:23 ` [PATCH 0/2] Fixes for KSZ DSA switch Florian Fainelli
2021-07-16  8:49   ` Aw: " Lino Sanfilippo

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