netdev - Re: [RFC PATCH 6/9] ethtool: Add support for toggling any of the GSO offloads

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Message-ID: <CAEh+42ihKJ30O_i9f7H0KzQBjNrBfQFXN=S3-ZsdYKssBkTSXg@mail.gmail.com>
Date:	Fri, 18 Mar 2016 19:01:16 -0700
From:	Jesse Gross <jesse@...nel.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	Alexander Duyck <aduyck@...antis.com>,
	Edward Cree <ecree@...arflare.com>,
	Netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Tom Herbert <tom@...bertland.com>
Subject: Re: [RFC PATCH 6/9] ethtool: Add support for toggling any of the GSO offloads

On Fri, Mar 18, 2016 at 6:42 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> On Fri, 2016-03-18 at 17:30 -0700, Alexander Duyck wrote:
>> On Fri, Mar 18, 2016 at 5:18 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
>> > On Fri, 2016-03-18 at 16:25 -0700, Alexander Duyck wrote:
>> > >       [NETIF_F_GSO_IPIP_BIT] =         "tx-ipip-segmentation",
>> > >       [NETIF_F_GSO_SIT_BIT] =          "tx-sit-segmentation",
>> > >       [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
>> > > +     [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
>> > > +     [NETIF_F_GSO_TUNNEL_REMCSUM_BIT] = "tx-remcsum-segmentation",
>> > I think this should be "tx-tunnel-remote-checksum-segmentation", though
>> > that is getting quite unwieldy.
>> Right.  As it is I think we might be coming up on the 32 character
>> limit for the strings.  Replacing csum with checksum would probably
>> push us over.
>
> Right, I wasn't even thinking about the static limit!  That does weigh
> rather heavily in favour of abbreviation here.
>
> Please do at least hyphenate "remcsum" though.

I think that remote checksum offload is just a purely internal feature
- that is no device will ever expose support for it, since it is
explicitly to work around lack of hardware support. As a result, I
don't know if it makes sense to show it through ethtool at all.