From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olivier MATZ <olivier.matz-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v3 0/3] enhance TX checksum command and csum
 forwarding engine
Date: Fri, 09 Jan 2015 11:45:18 +0100
Message-ID: <54AFB13E.2080200@6wind.com>
References: <1418173403-30202-1-git-send-email-jijiang.liu@intel.com>
 <54896F4A.4070601@6wind.com>
 <1ED644BD7E0A5F4091CF203DAFB8E4CC01DA1B70@SHSMSX101.ccr.corp.intel.com>
 <548B18C9.3020408@6wind.com>
 <1ED644BD7E0A5F4091CF203DAFB8E4CC01DA7699@SHSMSX101.ccr.corp.intel.com>
 <2601191342CEEE43887BDE71AB977258213D337B@irsmsx105.ger.corp.intel.com>
 <1ED644BD7E0A5F4091CF203DAFB8E4CC01DA789E@SHSMSX101.ccr.corp.intel.com>
 <2601191342CEEE43887BDE71AB977258213D34AE@irsmsx105.ger.corp.intel.com>
 <1ED644BD7E0A5F4091CF203DAFB8E4CC01DA7CC5@SHSMSX101.ccr.corp.intel.com>
 <2601191342CEEE43887BDE71AB977258213D3897@irsmsx105.ger.corp.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Cc: "dev-VfR2kkLFssw@public.gmane.org" <dev-VfR2kkLFssw@public.gmane.org>
To: "Ananyev, Konstantin" <konstantin.ananyev-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
 "Liu, Jijiang" <jijiang.liu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Return-path: <dev-bounces-VfR2kkLFssw@public.gmane.org>
In-Reply-To: <2601191342CEEE43887BDE71AB977258213D3897-pww93C2UFcwu0RiL9chJVbfspsVTdybXVpNB7YpNyf8@public.gmane.org>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev-VfR2kkLFssw@public.gmane.org>
List-Help: <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=subscribe>
Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org
Sender: "dev" <dev-bounces-VfR2kkLFssw@public.gmane.org>

Hi,

Thank you Jijiang for taking the time to get back on this.

On 01/08/2015 11:54 AM, Ananyev, Konstantin wrote:
>> And we are able to test all of cases in  http://dpdk.org/ml/archives/dev/2014-December/009213.html
>>
>> Test case A:
>>
>> tx_checksum set sw-tunnel-mode off
>> tx_checksum set hw-tunnel-mode off
>> tx_checksum set  ip   hw
>>
>> test case B.1:
>>
>> tx_checksum set sw-tunnel-mode on
>> tx_checksum set hw-tunnel-mode on
>> tx_checksum set  ip   hw
>> tx_checksum set  tcp   hw
>>
>> test case B.2:
>>
>> tx_checksum set sw-tunnel-mode on
>> tx_checksum set hw-tunnel-mode off
>> tx_checksum set  ip   hw
>>
>> test case C:
>>
>> tx_checksum set sw-tunnel-mode on
>> tx_checksum set hw-tunnel-mode on
>> tx_checksum set  outer-ip   hw
>> tx_checksum set  ip   hw
>> tx_checksum set  tcp   hw

There is something I don't understand. A forward engine takes any packet
in input and output. Packets can be of any kind (eth/arp, eth/ip/tcp,
eth/vlan/ip/udp/vxlan/eth/ip/tcp, ...)

Today, the behavior of csum forward engine is defined for any kind of
packet. See the description and the table in
http://dpdk.org/ml/archives/dev/2014-December/009886.html

All packets that are not "Ether[/vlan]/(IP|IP6)/(UDP|TCP|SCTP)" or
"Ether[/vlan]/(IP|IP6)/UDP/VxLAN/Ether[/vlan]/(IP|IP6)/UDP|TCP|SCTP"
are forwarded without beeing modified.

In my understanding, the use-case you are describing correspond to
specific packet types. So a configuration would work only for one
packet format only. Is it correct?

I think that the test-pmd command API should define a behavior for
the csum forward engine for any packet. What do you think?

Regards,
Olivier