netdev - Re: [PATCH net-next] net: ipv6/gre: Add GRO support

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Date:   Mon, 2 Apr 2018 18:00:20 +0300
From:   Eran Ben Elisha <eranlinuxmellanox@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next] net: ipv6/gre: Add GRO support

>>> Seems good, but why isn't this handled directly in GRO native layer ?
>> ip6_tunnel and ip6_gre do not share initialization flow functions (unlike ipv4).
>> Changing the ipv6 init infrastructure should not be part of this
>> patch. we prefer to keep this one minimal, simple and safe.
>
>
>
> Looking at gre_gro_receive() and gre_gro_complete() I could not see why they
> could not be copied/pasted to IPv6.

These functions to handle GRO over GRE are already assigned in
gre_offload_init() (in net/ipv4/gre_offload.c under CONFIG_IPV6).
However without initializing the gro_cells, the receive path will not
go via napi_gro_receive path, but directly to netif_rx.
So AFAIU, only gcells->cells was missing for gro_cells_receive to
really go via GRO flow.

>
> Maybe give more details on the changelog, it is really not obvious.
Hopefully the above filled this request.
>