netdev - Re: USO / UFO status ?

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Message-ID: <99c9e80e-7e97-8490-fb43-b159fe6e8d7b@akamai.com>
Date:   Wed, 30 Oct 2019 14:22:32 -0700
From:   Josh Hunt <johunt@...mai.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: USO / UFO status ?

On 10/30/19 12:48 PM, Willem de Bruijn wrote:
> On Wed, Oct 30, 2019 at 3:16 PM Jose Abreu <Jose.Abreu@...opsys.com> wrote:
>>
>> Hi netdev,
>>
>> What's the status of UDP Segmentation Offload (USO) and UDP
>> Fragmentation Offloading (UFO) on current mainline ?
>>
>> I see that NETIF_F_GSO_UDP_L4 is only supported by Mellanox NIC's but I
>> also saw some patches from Intel submitting the support. Is there any
>> tool to test this (besides the -net selftests) ?
> 
> UDP segmentation offload with UDP_SEGMENT is always available with
> software segmentation. The only driver with hardware offload (USO)
> merged so far is indeed mlx5. Patches for various Intel NICs are in
> review.
> 

I recently added UDP GSO offload support for ixgbe, igb, and i40e. I saw 
that Jeff sent the patches to Dave earlier today targeting net-next so 
you should be able to test with those once they land in net-next.

I also wrote a wrapper script around the selftest benchmark code to do 
my testing with, and believe the Intel folks used it as part of their 
validation as well. You can find it attached to this thread:

https://lore.kernel.org/netdev/0e0e706c-4ce9-c27a-af55-339b4eb6d524@akamai.com/

Unfortunately it's poorly named there since there's already a 
udpgso_bench.sh in the kernel tree... :|

Josh