netdev - Re: [net-next PATCH 2/5] GSO: Add GSO type for fixed IPv4 ID

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Date:	Fri, 8 Apr 2016 18:41:00 -0300
From:	Jesse Gross <jesse@...nel.org>
To:	Alexander Duyck <aduyck@...antis.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Tom Herbert <tom@...bertland.com>,
	Alexander Duyck <alexander.duyck@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [net-next PATCH 2/5] GSO: Add GSO type for fixed IPv4 ID

On Fri, Apr 8, 2016 at 5:33 PM, Alexander Duyck <aduyck@...antis.com> wrote:
> This patch adds support for TSO using IPv4 headers with a fixed IP ID
> field.  This is meant to allow us to do a lossless GRO in the case of TCP
> flows that use a fixed IP ID such as those that convert IPv6 header to IPv4
> headers.
>
> In addition I am adding a feature that for now I am referring to TSO with
> IP ID mangling.  Basically when this flag is enabled the device has the
> option to either output the flow with incrementing IP IDs or with a fixed
> IP ID regardless of what the original IP ID ordering was.  This is useful
> in cases where the DF bit is set and we do not care if the original IP ID
> value is maintained.
>
> Signed-off-by: Alexander Duyck <aduyck@...antis.com>

I think SKB_GSO_TCP_FIXEDID would also need to be added to the list of
enumerated OK GSO types for MPLS GSO.