netdev - Re: [PATCH net-next v1 1/9] ethtool: Add support for configuring frame preemption

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Date:   Mon, 07 Dec 2020 16:24:02 -0800
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, m-karicheri2@...com, vladimir.oltean@....com,
        Jose.Abreu@...opsys.com, po.liu@....com,
        intel-wired-lan@...ts.osuosl.org, anthony.l.nguyen@...el.com
Subject: Re: [PATCH net-next v1 1/9] ethtool: Add support for configuring
 frame preemption

Jakub Kicinski <kuba@...nel.org> writes:

> On Mon, 07 Dec 2020 14:11:48 -0800 Vinicius Costa Gomes wrote:
>> Jakub Kicinski <kuba@...nel.org> writes:
>> >> + * @min_frag_size_mult: Minimum size for all non-final fragment size,
>> >> + * expressed in terms of X in '(1 + X)*64 + 4'  
>> >
>> > Is this way of expressing the min frag size from the standard?
>> >  
>> 
>> The standard has this: "A 2-bit integer value indicating, in units of 64
>> octets, the minimum number of octets over 64 octets required in
>> non-final fragments by the receiver" from IEEE 802.3br-2016, Table
>> 79-7a.
>
> Thanks! Let's drop the _mult suffix and add a mention of this
> controlling the addFragSize variable from the standard. Perhaps 
> it should in fact be called add_frag_size (with an explanation 
> that the "additional" means "above the 64B" which are required in
> Ethernet, and which are accounted for by the "1" in the 1 + X
> formula)?

Sounds good :-) Will add a comment with the standard reference and
change the name to 'add_frag_size'.


Cheers,
-- 
Vinicius