netdev - Re: [PATCH net-next 2/2] bnx2x: add RSS capability for GRE traffic

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Message-ID: <CAPshTCgpE3MoR3D8=EZa_CFVDBwN+fYDZZQrTchhtq-OM_rKzQ@mail.gmail.com>
Date:	Sat, 17 Aug 2013 10:53:00 -0700
From:	Jerry Chu <hkchu@...gle.com>
To:	Dmitry Kravkov <dmitry@...adcom.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eilon Greenstein <eilong@...adcom.com>,
	Tom Herbert <therbert@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: Re: [PATCH net-next 2/2] bnx2x: add RSS capability for GRE traffic

Dmitry,

On Mon, Mar 18, 2013 at 11:30 PM, Dmitry Kravkov <dmitry@...adcom.com> wrote:
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On Behalf Of Eric Dumazet
>> Sent: Tuesday, March 19, 2013 2:08 AM
>> To: Dmitry Kravkov
>> Cc: davem@...emloft.net; netdev@...r.kernel.org; Eilon Greenstein; Tom Herbert; Maciej Żenczykowski
>> Subject: Re: [PATCH net-next 2/2] bnx2x: add RSS capability for GRE traffic
>>
>> On Mon, 2013-03-18 at 18:51 +0200, Dmitry Kravkov wrote:
>> > The patch drives FW to perform RSS for GRE traffic,
>> > based on inner headers.
>> >
>> > Signed-off-by: Dmitry Kravkov <dmitry@...adcom.com>
>> > Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
>> > ---
>> >  drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h |    3 +++
>> >  drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c  |   23 ++++++++++++-----------
>> >  drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h  |    9 +++++++++
>> >  3 files changed, 24 insertions(+), 11 deletions(-)
>>
>> This works very well.
>>
>> Problem is we skb_set_queue_mapping(skb, 0); in __skb_tunnel_rx()
>>
>> (this was a patch from Tom Herbert, commit
>> 693019e90ca45d881109d32c0c6d29adf03f6447 (net: reset skb queue mapping
>> when rx'ing over tunnel )
>>
>> Meaning we hit a single cpu for the GRO stuff in ip_gre.
>>
>> I have to think about it.
>>
>>
>> Another question is :
>>
>> Can bnx2x check the tcp checksum if GRE encapsulated ?
>>
> Current HW can't provide this. Probably, it's possible to separate CSUM from GRO/TPA then stack will have to handle CSUM validation for huge packets. Is it worth?

Could you elaborate on what you meant above? (I'm looking for any form
of h/w assist for
csum validation for GRO/TPA pkts since csum computation can be expensive and  as
you said below CHECKSUM_COMPLETE is out of the question.)

Thanks,

Jerry

>
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