netdev - Re: [PATCH net-next v2 2/2] ip_gre: propogate target device GSO capability to the tunnel device

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Date:	Tue, 19 Feb 2013 14:51:18 -0800
From:	pravin <pravin.shelar@...il.com>
To:	Dmitry Kravkov <dmitry@...adcom.com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/2] ip_gre: propogate target device GSO
 capability to the tunnel device

On Tue, Feb 19, 2013 at 11:31 AM, Dmitry Kravkov <dmitry@...adcom.com> wrote:
>> -----Original Message-----
>> From: pravin [mailto:pravin.shelar@...il.com]
>> Sent: Tuesday, February 19, 2013 8:40 PM
>> To: Dmitry Kravkov
>> Cc: davem@...emloft.net; netdev@...r.kernel.org
>> Subject: Re: [PATCH net-next v2 2/2] ip_gre: propogate target device GSO
>> capability to the tunnel device
>>
>> On Mon, Feb 18, 2013 at 11:50 AM, Dmitry Kravkov <dmitry@...adcom.com>
>> wrote:
>> >
>> > Signed-off-by: Dmitry Kravkov <dmitry@...adcom.com>
>> > ---
>> > Changes from v1: fixed email address
>> >
>> >
>> >  net/ipv4/ip_gre.c |   10 ++++++++--
>> >  1 files changed, 8 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
>> > index cdc31ac..31bc941 100644
>> > --- a/net/ipv4/ip_gre.c
>> > +++ b/net/ipv4/ip_gre.c
>> > @@ -1103,8 +1103,14 @@ static int ipgre_tunnel_bind_dev(struct net_device
>> *dev)
>> >         tunnel->hlen = addend;
>> >         /* TCP offload with GRE SEQ is not supported. */
>> >         if (!(tunnel->parms.o_flags & GRE_SEQ)) {
>> > -               dev->features           |= NETIF_F_GSO_SOFTWARE;
>> > -               dev->hw_features        |= NETIF_F_GSO_SOFTWARE;
>> > +               /* device supports enc gso offload*/
>> > +               if (tdev->hw_enc_features & NETIF_F_GRE_GSO) {
>> > +                       dev->features           |= NETIF_F_TSO;
>> > +                       dev->hw_features        |= NETIF_F_TSO;
>> > +               } else {
>> > +                       dev->features           |= NETIF_F_GSO_SOFTWARE;
>> > +                       dev->hw_features        |= NETIF_F_GSO_SOFTWARE;
>> > +               }
>> >         }
>>
>> I am not sure about this change, Are you trying to limit GRE TSO to
>> just IPV4  in case of GRE offload in hardware?
>>
> You're right,
> It probably should be fixed to:
>         if (tdev && tdev->hw_enc_features & NETIF_F_GRE_GSO) {
>                 dev->features           |= tdev-> hw_enc_features & NETIF_F_GSO_MASK;
>                 dev->hw_features        |= tdev-> hw_enc_features & NETIF_F_GSO_MASK;
>
>> >
>> >         return mtu;
>> > --
>> > 1.7.7.2
>> >

I think if device features are set right, dev_hard_start_xmit() should
do right thing without any of these changes. i.e. it will GSO ipv6
packets if hardware only supports GRE-ipv4 packets.
This patch changes that at encapsulated dev layer and disables rest of
GSO if one type of TSO available which is not optimal.

>> >
>> > --
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>
>
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