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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Olivier MATZ <olivier.matz@6wind.com>,
	"Liu, Jijiang" <jijiang.liu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 1/3] mbuf:add two TX offload flags and change three fields
Date: Mon, 1 Dec 2014 11:58:36 +0000	[thread overview]
Message-ID: <2601191342CEEE43887BDE71AB977258213BBB21@IRSMSX105.ger.corp.intel.com> (raw)
In-Reply-To: <547C3A43.8020009@6wind.com>



> -----Original Message-----
> From: Olivier MATZ [mailto:olivier.matz@6wind.com]
> Sent: Monday, December 01, 2014 9:52 AM
> To: Liu, Jijiang; Ananyev, Konstantin
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH 1/3] mbuf:add two TX offload flags and change three fields
> 
> Hi Jijiang,
> 
> On 12/01/2014 03:30 AM, Liu, Jijiang wrote:
> >> After another thought, I think that the way you proposed is a better one.
> >> I gives us more flexibility:
> >> let's say for now we'll keep both l2_len and outer_l2_len as 7 bit fields, and upper
> >> layer would have to:
> >> mb->l2_len =  eth_hdr_in + vxlan_hdr;
> >
> > A question, how to fill the mb->l2_len  for IP in IP, IP in GRE tunneling packet that is no inner L2 header?
> > What  is the rule?
> > Or you think it should be mb->l2_len =  0 + l4_tun_len;  ??

I think it should be:
l2_len =  0 + l4_tun_len;

>From your patch:
l4_tunnel_len = l4_tun_len + l2_len;

> 
> We could have the following rule:
> - the l2_len starts after the end of outer_l2_len + outer_l3_len (if
>   they are not 0)

I think it should start after the outer_l4_hdr.
I.e. right now we don't include udp header length into it.

> - l2_len is the length of all headers up to the first ip or ipv6
>   header

Yes, same thought here.

> 
> Examples:
> 
> Ether/IP/UDP/xxx
>   m->outer_l2_len = 0
>   m->outer_l3_len = 0
>   m->l2_len = sizeof(ether)
>   m->l3_len = sizeof(ip)
>   m->l4_len = sizeof(udp)
> 
> Ether/IP/IP/UDP/xxx
>   m->outer_l2_len = sizeof(ether)
>   m->outer_l3_len = sizeof(ip)
>   m->l2_len = 0
>   m->l3_len = sizeof(ip)
>   m->l4_len = sizeof(udp)
> 
> Ether/IP/GRE/IP/UDP/xxx
>   m->outer_l2_len = sizeof(ether)
>   m->outer_l3_len = sizeof(ip)
>   m->l2_len = sizeof(gre)
>   m->l3_len = sizeof(ip)
>   m->l4_len = sizeof(udp)
> 
> Ether/IP/UDP/vxlan/Ether/IP/UDP/xxx
>   m->outer_l2_len = sizeof(ether)
>   m->outer_l3_len = sizeof(ip)
>   m->l2_len = sizeof(udp) + sizeof(vxlan) + sizeof(ether)

I think it should be:
m->l2_len = sizeof(vxlan) + sizeof(ether)

We don't need to add sizeof(udp) as we already say to the HW that I t will be UDP TUNNELING vi the ol_flag: PKT_TX_UDP_TUNNEL_PKT.

>   m->l3_len = sizeof(ip)
>   m->l4_len = sizeof(udp)
> 
> Regards,
> Olivier

  reply	other threads:[~2014-12-01 11:58 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-27  8:18 [dpdk-dev] [PATCH 0/3] i40e VXLAN TX checksum rework Jijiang Liu
2014-11-27  8:18 ` [dpdk-dev] [PATCH 1/3] mbuf:add two TX offload flags and change three fields Jijiang Liu
2014-11-27 10:00   ` Olivier MATZ
2014-11-27 13:14     ` Liu, Jijiang
2014-11-28  9:17       ` Olivier MATZ
     [not found]     ` <1ED644BD7E0A5F4091CF203DAFB8E4CC01D9EEA0@SHSMSX101.ccr.corp.intel.com>
2014-11-27 14:56       ` Ananyev, Konstantin
2014-11-27 17:01         ` Ananyev, Konstantin
2014-11-28 10:45           ` Olivier MATZ
2014-11-28 11:16             ` Ananyev, Konstantin
2014-11-30 14:50             ` Ananyev, Konstantin
2014-12-01  2:30               ` Liu, Jijiang
2014-12-01  9:52                 ` Olivier MATZ
2014-12-01 11:58                   ` Ananyev, Konstantin [this message]
2014-12-01 12:28                     ` Olivier MATZ
2014-12-01 13:07                       ` Liu, Jijiang
2014-12-01 14:31                         ` Ananyev, Konstantin
2014-11-27  8:18 ` [dpdk-dev] [PATCH 2/3] i40e:PMD change for VXLAN TX checksum Jijiang Liu
2014-11-27  8:18 ` [dpdk-dev] [PATCH 3/3] testpmd:rework csum forward engine Jijiang Liu
2014-11-27 10:23   ` Olivier MATZ
2014-11-27  8:50 ` [dpdk-dev] [PATCH 0/3] i40e VXLAN TX checksum rework Liu, Jijiang
2014-11-27  9:44 ` Olivier MATZ
2014-11-27 10:12   ` Olivier MATZ
2014-11-27 12:06     ` Liu, Jijiang
2014-11-27 12:07   ` Liu, Jijiang
2014-11-27 15:29   ` Ananyev, Konstantin
2014-11-27 16:31     ` Liu, Jijiang
2014-12-03  8:02       ` Liu, Jijiang
2014-11-28  9:26     ` Olivier MATZ

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