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From: "Liu, Jijiang" <jijiang.liu@intel.com>
To: "Liu, Jijiang" <jijiang.liu@intel.com>,
	Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v8 10/10] app/testpmd:test VxLAN Tx checksum offload
Date: Thu, 13 Nov 2014 05:39:26 +0000
Message-ID: <1ED644BD7E0A5F4091CF203DAFB8E4CC01D9926D@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <1ED644BD7E0A5F4091CF203DAFB8E4CC01D99258@SHSMSX101.ccr.corp.intel.com>

Please Ignore this mail.


> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Liu, Jijiang
> Sent: Thursday, November 13, 2014 1:35 PM
> To: Thomas Monjalon
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v8 10/10] app/testpmd:test VxLAN Tx checksum
> offload
> 
> 
> 
> > -----Original Message-----
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > Sent: Thursday, November 13, 2014 1:26 AM
> > To: Liu, Jijiang
> > Cc: dev@dpdk.org; Olivier MATZ
> > Subject: Re: [dpdk-dev] [PATCH v8 10/10] app/testpmd:test VxLAN Tx
> > checksum offload
> >
> > 2014-11-11 05:29, Liu, Jijiang:
> > > From: Olivier MATZ
> > > > On 11/10/2014 07:03 AM, Liu, Jijiang wrote:
> > > > > > - if PKT_TX_VXLAN_CKSUM is not set (legacy use case), then the
> > > > > >    driver use l2_len and l3_len to offload inner IP/UDP/TCP checksums.
> > > > >
> > > > > If the flag is not set, and imply that it is not VXLAN packet,
> > > > > and do TX checksum offload as regular packet.
> > > > >
> > > > > > - if PKT_TX_VXLAN_CKSUM is set, then the driver has to use
> > > > > >    inner_l{23}_len instead of l{23}_len for the same operation.
> > > > >
> > > > > Your understanding is not fully correct.
> > > > > The l{23}_len is still used for TX checksum offload, please
> > > > > refer to
> > > > > i40e_txd_enable_checksum()  implementation.
> > > >
> > > > This fields are part of public mbuf API. You cannot say to refer
> > > > to i40e PMD code to understand how to use it.
> > > >
> > > > > > Adding PKT_TX_VXLAN_CKSUM changes the semantic of l2_len and
> > l3_len.
> > > > > > To fix this, I suggest to remove the new fields
> > > > > > inner_l{23}_len then add outer_l{23}_len instead. Therefore,
> > > > > > the semantic of l2_len and l3_len would not change, and a
> > > > > > driver would always use the same field for a specific offload.
> > > > >
> > > > > Oh...
> > > >
> > > > Does it mean you agree?
> > >
> > > I don't agree to change inner_l{23}_len the name.
> > > The reason is that using the "inner" word means incoming packet is
> > > tunneling
> > packet or encapsulation packet.
> > > if we add "outer"{2,3}_len, which will cause confusion when
> > > processing non-
> > tunneling packet.
> >
> > Sorry Jijiang, maybe I don't understand what you are saying, but I
> > think you missed something. Let me explain the problem.
> >
> > For PKT_TX_IP_CKSUM, we must set l{2,3}_len.
> > When PKT_TX_VXLAN_CKSUM is set, PKT_TX_IP_CKSUM is related to inner
> > IP, right?
> First of all, I want to explain that what PKT_TX_VXLAN_CKSUM meaning is,  when
> the flag is set, driver know that it need set TX checksum for whole packet, not
> only for inner part.
> 
> So When PKT_TX_VXLAN_CKSUM is set, PKT_TX_IP_CKSUM is related to inner
> IP,right?
> 
> 
> 
> > So we must set inner_l{2,3}_len.
> > It means that PKT_TX_IP_CKSUM requires different fields to be set,
> > depending of PKT_TX_VXLAN_CKSUM. That's what Olivier calls a semantic
> change.
> > It's not acceptable for an API.
> >
> > PKT_TX_IP_CKSUM should always be related to l{2,3}_len.
> > When PKT_TX_VXLAN_CKSUM is set, we should add outer_l{2,3}_len.
> >
> > Please, correct me if I'm wrong or fix the API.
> >
> > Thanks
> > --
> > Thomas

  reply	other threads:[~2014-11-13  5:30 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-27  2:13 [dpdk-dev] [PATCH v8 00/10] Support VxLAN on Fortville Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 01/10] librte_mbuf:the rte_mbuf structure changes Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 02/10] librte_ether:add the basic data structures of VxLAN Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 03/10] librte_ether:add VxLAN packet identification API Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 04/10] i40e:support VxLAN packet identification in i40e Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 05/10] app/test-pmd:test VxLAN packet identification Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 06/10] librte_ether:add data structures of VxLAN filter Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 07/10] i40e:implement the API of VxLAN filter in librte_pmd_i40e Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 08/10] app/testpmd:test VxLAN packet filter Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 09/10] i40e:support VxLAN Tx checksum offload Jijiang Liu
2014-10-27  2:13 ` [dpdk-dev] [PATCH v8 10/10] app/testpmd:test " Jijiang Liu
2014-11-04  8:19   ` Olivier MATZ
2014-11-05  6:02     ` Liu, Jijiang
2014-11-05 10:28       ` Olivier MATZ
2014-11-06 11:24         ` Liu, Jijiang
2014-11-06 13:08           ` Olivier MATZ
2014-11-06 14:27             ` Liu, Jijiang
2014-11-07  0:43         ` Yong Wang
2014-11-07 17:16           ` Olivier MATZ
2014-11-10 11:39             ` Ananyev, Konstantin
2014-11-10 15:57               ` Olivier MATZ
2014-11-12  9:55                 ` Ananyev, Konstantin
2014-11-12 13:05                   ` Olivier MATZ
2014-11-12 13:40                     ` Thomas Monjalon
2014-11-12 23:14                       ` Ananyev, Konstantin
2014-11-12 14:39                     ` Ananyev, Konstantin
2014-11-12 14:56                       ` Olivier MATZ
     [not found]             ` <D0868B54.24DBB%yongwang@vmware.com>
2014-11-11  0:07               ` [dpdk-dev] FW: " Yong Wang
2014-11-10  6:03         ` [dpdk-dev] " Liu, Jijiang
2014-11-10 16:17           ` Olivier MATZ
     [not found]             ` <1ED644BD7E0A5F4091CF203DAFB8E4CC01D8F7A7@SHSMSX101.ccr.corp.intel.com>
2014-11-12 17:26               ` Thomas Monjalon
2014-11-13  5:35                 ` Liu, Jijiang
2014-11-13  5:39                   ` Liu, Jijiang [this message]
2014-11-13  6:51                 ` Liu, Jijiang
2014-11-13  9:10                   ` Thomas Monjalon
2014-11-14  8:15                     ` Liu, Jijiang
2014-11-14  9:09                       ` Olivier MATZ
2014-11-17  6:52                         ` Liu, Jijiang
2014-11-17 11:21                           ` Olivier MATZ
2014-11-20  7:28                             ` Liu, Jijiang
2014-11-20 16:36                               ` Olivier MATZ
2014-11-21  5:40                                 ` Liu, Jijiang
2014-10-27  2:20 ` [dpdk-dev] [PATCH v8 00/10] Support VxLAN on Fortville Liu, Yong
2014-10-27  2:41 ` Zhang, Helin
2014-10-27 13:46   ` Thomas Monjalon
2014-10-27 14:34     ` Liu, Jijiang
2014-10-27 15:15       ` Thomas Monjalon

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