netdev - Re: [PATCH net v2 2/2] udp: only do GSO if # of segs

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Message-ID: <CA+FuTSf89E1wOyT09=dLN0BJU-z_xmHSDi=_d1AXkhSs4sfnzw@mail.gmail.com>
Date:   Wed, 2 Oct 2019 16:41:32 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Josh Hunt <johunt@...mai.com>
Cc:     David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH net v2 2/2] udp: only do GSO if # of segs > 1

On Wed, Oct 2, 2019 at 1:29 PM Josh Hunt <johunt@...mai.com> wrote:
>
> Prior to this change an application sending <= 1MSS worth of data and
> enabling UDP GSO would fail if the system had SW GSO enabled, but the
> same send would succeed if HW GSO offload is enabled. In addition to this
> inconsistency the error in the SW GSO case does not get back to the
> application if sending out of a real device so the user is unaware of this
> failure.
>
> With this change we only perform GSO if the # of segments is > 1 even
> if the application has enabled segmentation. I've also updated the
> relevant udpgso selftests.
>
> Fixes: bec1f6f69736 ("udp: generate gso with UDP_SEGMENT")
> Signed-off-by: Josh Hunt <johunt@...mai.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>

Thanks Josh.