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

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Date:	Fri, 18 Mar 2016 17:30:25 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	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 5:18 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> On Fri, 2016-03-18 at 16:25 -0700, Alexander Duyck wrote:
>
>> The strings were missing for several of the GSO offloads that are
>> available.  This patch provides the missing strings so that we can toggle
>> or query any of them via the ethtool command.
>>
>> Signed-off-by: Alexander Duyck <aduyck@...antis.com>
>> ---
>>  net/core/ethtool.c |    3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
>> index 2966cd0d7c93..b3c39d531469 100644
>> --- a/net/core/ethtool.c
>> +++ b/net/core/ethtool.c
>> @@ -82,9 +82,12 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
>>       [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
>>       [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
>>       [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
>> +     [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
>
> All of the existing checksum offload names include the word "checksum"
> in full, so I think the new names should do the same.

It isn't a checksum offload though, it is a segmentation offload for a
tunnel that has an outer checksum.  I was hoping to avoid using the
word checksum as that might make it confusing as it is a segmentation
offload, not a checksum offload.

>>       [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.

- Alex