netdev - Re: [PATCH v2 net-next 2/2] net: airoha: Introduce ethernet support for EN7581 SoC

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Date: Tue, 18 Jun 2024 15:46:40 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, nbd@....name, lorenzo.bianconi83@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, conor@...nel.org,
	linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, catalin.marinas@....com,
	will@...nel.org, upstream@...oha.com,
	angelogioacchino.delregno@...labora.com,
	benjamin.larsson@...exis.eu, linux-clk@...r.kernel.org,
	rkannoth@...vell.com, sgoutham@...vell.com
Subject: Re: [PATCH v2 net-next 2/2] net: airoha: Introduce ethernet support
 for EN7581 SoC

> +static void airoha_fe_maccr_init(struct airoha_eth *eth)
> +{

...

> +	airoha_fe_wr(eth, REG_FE_VIP_PATN(11), 0xc057); /* PPP->IPv6CP (0xc057) */

include/uapi/linux/ppp_defs.h
#define PPP_IPV6CP      0x8057  /* IPv6 Control Protocol */

Are these the same thing? Why is there one bit difference?


> +	airoha_fe_wr(eth, REG_FE_VIP_PATN(17), 0x1ae0);
> +	airoha_fe_wr(eth, REG_FE_VIP_EN(17),
> +		     PATN_FCPU_EN_MASK | PATN_SP_EN_MASK |
> +		     FIELD_PREP(PATN_TYPE_MASK, 3) | PATN_EN_MASK);
> +
> +	airoha_fe_wr(eth, REG_FE_VIP_PATN(18), 0x1ae00000);
> +	airoha_fe_wr(eth, REG_FE_VIP_EN(18),
> +		     PATN_FCPU_EN_MASK | PATN_DP_EN_MASK |
> +		     FIELD_PREP(PATN_TYPE_MASK, 3) | PATN_EN_MASK);

> +	airoha_fe_wr(eth, REG_FE_VIP_PATN(22), 0xaaaa);

Please add a comment what these match.

> +static int airoha_dev_change_mtu(struct net_device *dev, int new_mtu)
> +{
> +	dev->mtu = new_mtu;
> +
> +	return 0;
> +}
> +

I don't think this is needed. Look at __dev_set_mtu().

    Andrew

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