From: Olivier MATZ <olivier.matz@6wind.com>
To: "Liu, Jijiang" <jijiang.liu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v3 0/3] enhance TX checksum command and csum forwarding engine
Date: Wed, 21 Jan 2015 10:10:57 +0100 [thread overview]
Message-ID: <54BF6D21.3010506@6wind.com> (raw)
In-Reply-To: <1ED644BD7E0A5F4091CF203DAFB8E4CC01DB56B3@SHSMSX101.ccr.corp.intel.com>
Hi Jijiang,
On 01/21/2015 09:01 AM, Liu, Jijiang wrote:
>>> I still don't understand why you are so eager to 'forbid' it.
>>> Yes we support it for FVL, but no one forces you to use it.
>>
>> Well, how would you describe this 2 ways of doing the same thing in the
>> offload API? Would you talk about the i40e registers? It's not because i40e
>> has 2 ways to do the same operation that the DPDK should do the same.
>>
>> How will you explain to a user how to choose between these 2 cases?
>
> Talk about B method in http://dpdk.org/ml/archives/dev/2014-December/009213.html again.
>
> DPDK Never supports a NIC that can recognize tunneling packet for TX side before 1.8, right?
When you say "recognize tunnel", if you mean offlading checksum of
tunnel headers, I agree.
If you mean recognizing a tunnel packet in rx, I also agree
it's new to dpdk-1.8, but I think it's unrelated to what we
are talking about, which is tx checksum. A DPDK application
is able to generate tunnel packets by itself and offload the
checksums to the NIC.
> So when we need to support TX checksum offload for tunneling packet, and we have to choose B.2.
I don't see why we should choose either B.1 or B.2 (I guess you want
to say B.1 here, right?).
The m->lX_len are not filled in rx today. If one day they are, it won't
prevent the application to configure the lX_len fields and offload
flags according to the API.
> After introducing i40e(FVL), FVL is able to recognize tunneling packet and support outer IP, or inner IP or outer IP and inner IP TX checksum for tunneling packet.
> And you agree on "outer and inner at the same time", why do you object "only inner"?
>
> Actually, B.2 method is a software workaround using L2 length when NIC can't recognize tunneling packet.
> When NIC is able to recognize tunneling packet, I think you shouldn't take B.2 as a standard to 'forbid' other method.
Again, I'm not sure there is a link between "recognizing tunneling
packets" and tx checksum offload of tunnels.
Regards,
Olivier
next prev parent reply other threads:[~2015-01-21 9:10 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-10 1:03 Jijiang Liu
2014-12-10 1:03 ` [dpdk-dev] [PATCH v3 1/3] librte_ether:add outer IP offload capability flag Jijiang Liu
2014-12-11 10:33 ` Olivier MATZ
2014-12-10 1:03 ` [dpdk-dev] [PATCH v3 2/3] i40e:support outer IPv4 checksum capability Jijiang Liu
2014-12-11 10:34 ` Olivier MATZ
2014-12-10 1:03 ` [dpdk-dev] [PATCH v3 3/3] app/testpmd:change tx_checksum command and csum forwarding engine Jijiang Liu
2014-12-11 10:52 ` Olivier MATZ
2014-12-12 4:06 ` Liu, Jijiang
2014-12-11 10:17 ` [dpdk-dev] [PATCH v3 0/3] enhance TX checksum " Olivier MATZ
2014-12-12 3:48 ` Liu, Jijiang
2014-12-12 16:33 ` Olivier MATZ
2015-01-07 2:03 ` Liu, Jijiang
2015-01-07 9:59 ` Ananyev, Konstantin
2015-01-07 11:39 ` Liu, Jijiang
2015-01-07 12:07 ` Ananyev, Konstantin
2015-01-08 8:51 ` Liu, Jijiang
2015-01-08 10:54 ` Ananyev, Konstantin
2015-01-09 10:45 ` Olivier MATZ
2015-01-12 3:41 ` Liu, Jijiang
2015-01-12 11:43 ` Olivier MATZ
2015-01-13 3:04 ` Liu, Jijiang
2015-01-13 9:55 ` Olivier MATZ
2015-01-14 3:01 ` Liu, Jijiang
2015-01-15 13:31 ` Ananyev, Konstantin
2015-01-16 17:27 ` Olivier MATZ
2015-01-19 13:04 ` Ananyev, Konstantin
2015-01-19 14:38 ` Olivier MATZ
2015-01-20 1:12 ` Ananyev, Konstantin
2015-01-20 12:39 ` Olivier MATZ
2015-01-20 15:18 ` Thomas Monjalon
2015-01-20 17:10 ` Stephen Hemminger
2015-01-20 17:23 ` Ananyev, Konstantin
2015-01-20 18:15 ` Olivier MATZ
2015-01-21 3:12 ` Liu, Jijiang
2015-01-21 15:25 ` Olivier MATZ
2015-01-21 16:28 ` Ananyev, Konstantin
2015-01-21 17:13 ` Olivier MATZ
2015-01-26 4:13 ` Ananyev, Konstantin
2015-01-26 6:02 ` Liu, Jijiang
2015-01-26 14:07 ` Olivier MATZ
2015-01-26 14:15 ` Ananyev, Konstantin
2015-01-27 8:34 ` Olivier MATZ
2015-01-27 15:26 ` Ananyev, Konstantin
2015-01-21 19:44 ` Stephen Hemminger
2015-01-22 1:40 ` Liu, Jijiang
2015-01-21 8:01 ` Liu, Jijiang
2015-01-21 9:10 ` Olivier MATZ [this message]
2015-01-21 11:52 ` Ananyev, Konstantin
2015-01-07 13:06 ` Qiu, Michael
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