linux-kernel - Re: [PATCH 01/14] net: ethernet: mtk_eth_soc: account for vlan in rx header length

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Date:   Tue, 8 Nov 2022 07:18:24 +0100
From:   Felix Fietkau <nbd@....name>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] net: ethernet: mtk_eth_soc: account for vlan in rx
 header length

On 07.11.22 21:55, Vladimir Oltean wrote:
> On Mon, Nov 07, 2022 at 07:54:39PM +0100, Felix Fietkau wrote:
>> This may be needed for correct MTU settings on devices using DSA
>> 
>> Signed-off-by: Felix Fietkau <nbd@....name>
>> ---
>>  drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
>> index 589f27ddc401..dcf2a0d5da33 100644
>> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
>> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
>> @@ -29,7 +29,7 @@
>>  #define MTK_TX_DMA_BUF_LEN_V2	0xffff
>>  #define MTK_DMA_SIZE		512
>>  #define MTK_MAC_COUNT		2
>> -#define MTK_RX_ETH_HLEN		(ETH_HLEN + ETH_FCS_LEN)
>> +#define MTK_RX_ETH_HLEN		(VLAN_ETH_HLEN + ETH_HLEN + ETH_FCS_LEN)
> 
> Commit title says account for VLAN (VLAN_HLEN, 4 bytes), code says add
> VLAN_ETH_HLEN (18) more bytes.
> 
> Also, why is DSA mentioned in the commit message? Is accounting for VLAN
> hlen not needed if DSA is not used? Why?
Will fix the code and improve the comments in v2.

- Felix