linux-kernel - Re: [RFC PATCH net-next 4/6] net: ethernet: implement data transaction interface

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Message-ID: <0601c914-a84d-c525-861e-b14dd8c45fda@microchip.com>
Date:   Tue, 19 Sep 2023 10:12:55 +0000
From:   <Parthiban.Veerasooran@...rochip.com>
To:     <andrew@...n.ch>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <corbet@....net>, <Steen.Hegelund@...rochip.com>,
        <rdunlap@...radead.org>, <horms@...nel.org>,
        <casper.casan@...il.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <Horatiu.Vultur@...rochip.com>,
        <Woojung.Huh@...rochip.com>, <Nicolas.Ferre@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <Thorsten.Kummermehr@...rochip.com>
Subject: Re: [RFC PATCH net-next 4/6] net: ethernet: implement data
 transaction interface

Hi Andrew,

On 18/09/23 6:31 pm, Andrew Lunn wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
>>>> +#define MAX_ETH_LEN  1536
>>>
>>> Where do 1536 come from? Maybe this needs an OA_TC6 prefix to make it
>>> clear this is specific to this protocol?
>> Ah it is a mistake. It is supposed to be an ethernet packet size which
>> is 1518 (1500 bytes MTU size + 18 bytes overhead) and it is not from OA.
>> It is a mistake and will correct it in the next version.
> 
> Please try to express this using ETH_DATA_LEN + sizeof(struct
> oa_tc6_overhead). Doing it like this will avoid errors like this since
> it is also part documentation.
Ok, in my case the define would be,

#define MAX_ETH_LEN      (ETH_DATA_LEN + ETH_HLEN + ETH_FCS_LEN)

Best Regards,
Parthiban V

> 
>     Andrew