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From: Jiayu Hu <jiayu.hu@intel.com>
To: "Tan, Jianfeng" <jianfeng.tan@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"yliu@fridaylinux.org" <yliu@fridaylinux.org>,
	"Wiles, Keith" <keith.wiles@intel.com>,
	"Bie, Tiwei" <tiwei.bie@intel.com>,
	"Yao, Lei A" <lei.a.yao@intel.com>,
	stephen@networkplumber.org
Subject: Re: [dpdk-dev] [PATCH v5 2/3] lib/gro: add TCP/IPv4 GRO support
Date: Thu, 22 Jun 2017 21:55:55 +0800	[thread overview]
Message-ID: <20170622135555.GA101615@localhost.localdomain> (raw)
In-Reply-To: <ED26CBA2FAD1BF48A8719AEF02201E36512137F8@SHSMSX103.ccr.corp.intel.com>

Hi Jianfeng,

On Thu, Jun 22, 2017 at 05:35:23PM +0800, Tan, Jianfeng wrote:
> Hi Jiayu,
> 
> > -----Original Message-----
> > From: Hu, Jiayu
> > Sent: Thursday, June 22, 2017 4:18 PM
> > To: Tan, Jianfeng
> > Cc: dev@dpdk.org; Ananyev, Konstantin; yliu@fridaylinux.org; Wiles, Keith;
> > Bie, Tiwei; Yao, Lei A
> > Subject: Re: [PATCH v5 2/3] lib/gro: add TCP/IPv4 GRO support
> > 
> > On Mon, Jun 19, 2017 at 11:43:20PM +0800, Tan, Jianfeng wrote:
> > >
> > >
> > > On 6/18/2017 3:21 PM, Jiayu Hu wrote:
> > > >
> > > > Each element in the flow array records the information of one flow,
> > > > which includes two parts:
> > > > - key: the criteria of the same flow. If packets have the same key
> > > >      value, they belong to the same flow.
> > > > - start_index: the index of the first incoming packet of this flow in
> > > >      the item array. With start_index, we can locate the first incoming
> > > >      packet of this flow.
> > > > Each element in the item array records one packet information. It mainly
> > > > includes two parts:
> > > > - pkt: packet address
> > > > - next_pkt_index: index of the next packet of the same flow in the item
> > > >      array. All packets of the same flow are chained by next_pkt_index.
> > > >      With next_pkt_index, we can locate all packets of the same flow
> > > >      one by one.
> > > >
> > > > To process an incoming packet, we need three steps:
> > > > a. check if the packet should be processed. Packets with the following
> > > >      properties won't be processed:
> > > > 	- packets without data;
> > > > 	- packets with wrong checksums;
> > >
> > > Why do we care to check this kind of error? Can we just suppose the
> > > applications have already dropped the packets with wrong cksum?
> > >
> > > > 	- fragmented packets.
> > >
> > > IP fragmented? I don't think we need to check it here either. It's the
> > > application's responsibility to call librte_ip_frag firstly to reassemble
> > > IP-fragmented packets, and then call this gro library to merge TCP packets.
> > > And this procedure should be shown in an example for other users to refer.
> > 
> > If we leave this check to applications, they have to call librte_ip_frag
> > first, then call GRO library. If they call GRO library first, error
> > happens. But if GRO checks if the packet is fragmented, no error happens.
> > IMO, it's more flexible. Besides, for GRO library, to check if the packet
> > is fragmented is very simple. Just to check if DF bit is set is enough.
> > So I still think GRO library need to check it.
> 
> I would expect ip fragment is also a gro engine (might be two for ipv4 and ipv6).

The case you mentioned is that packets are TSOed and also
IP fragmented. But current GRO doesn't support this case.
If we want to add a IP engine to perform IP reassembly
and cooperate with TCP engine to handle this case, I think
it's very hard to implement in current GRO. Because the
correct processing logic to process these packets is:
perform IP reassembly on N packets --> IP reassembled
packets to perform TCP GRO. So if we want to support
this case, I would prefer to ask applications to call
librte_ip_frag first and then to call GRO library,
rather than to add this IP engine.

Besides, to support this case, we also need to assume all
inputted packets are IP reassembled. Fragments which don't
have L4 header shouldn't be inputted. How do you think?

Thanks,
Jiayu

  reply	other threads:[~2017-06-22 13:54 UTC|newest]

Thread overview: 141+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22  9:32 [dpdk-dev] [PATCH 0/2] lib: add TCP IPv4 " Jiayu Hu
2017-03-22  9:32 ` [dpdk-dev] [PATCH 1/2] lib: add Generic Receive Offload support for TCP IPv4 packets Jiayu Hu
2017-03-22  9:32 ` [dpdk-dev] [PATCH 2/2] app/testpmd: provide TCP IPv4 GRO function in iofwd mode Jiayu Hu
     [not found] ` <1B893F1B-4DA8-4F88-9583-8C0BAA570832@intel.com>
     [not found]   ` <20170323021502.GA114662@localhost.localdomain>
     [not found]     ` <C830A6FC-F440-4E68-AB4E-2FD502722E3F@intel.com>
     [not found]       ` <20170323062433.GA120139@localhost.localdomain>
     [not found]         ` <59AF69C657FD0841A61C55336867B5B066729E3F@IRSMSX103.ger.corp.intel.com>
     [not found]           ` <20170323102135.GA124301@localhost.localdomain>
     [not found]             ` <2601191342CEEE43887BDE71AB9772583FAD410A@IRSMSX109.ger.corp.intel.com>
2017-03-24  2:23               ` [dpdk-dev] [PATCH 0/2] lib: add TCP IPv4 GRO support Jiayu Hu
2017-03-24  6:18                 ` Wiles, Keith
2017-03-24  7:22                   ` Yuanhan Liu
2017-03-24  8:06                     ` Jiayu Hu
2017-03-24 11:43                       ` Ananyev, Konstantin
2017-03-24 14:37                         ` Wiles, Keith
2017-03-24 14:59                           ` Olivier Matz
2017-03-24 15:07                             ` Wiles, Keith
2017-03-28 13:40                               ` Wiles, Keith
2017-03-28 13:57                                 ` Hu, Jiayu
2017-03-28 16:06                                   ` Wiles, Keith
2017-03-29 10:47                         ` Morten Brørup
2017-03-29 12:12                           ` Wiles, Keith
2017-04-04 12:31 ` [dpdk-dev] [PATCH v2 0/3] support GRO in DPDK Jiayu Hu
2017-04-04 12:31   ` [dpdk-dev] [PATCH v2 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-04-04 12:31   ` [dpdk-dev] [PATCH v2 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-04-04 12:31   ` [dpdk-dev] [PATCH v2 3/3] app/testpmd: enable GRO feature Jiayu Hu
2017-04-24  8:09   ` [dpdk-dev] [PATCH v3 0/3] support GRO in DPDK Jiayu Hu
2017-04-24  8:09     ` [dpdk-dev] [PATCH v3 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-05-22  9:19       ` Ananyev, Konstantin
2017-05-23 10:31         ` Jiayu Hu
2017-05-24 12:38           ` Ananyev, Konstantin
2017-05-26  7:26             ` Jiayu Hu
2017-05-26 23:10               ` Ananyev, Konstantin
2017-05-27  3:41                 ` Jiayu Hu
2017-05-27 11:12                   ` Ananyev, Konstantin
2017-05-27 14:09                     ` Jiayu Hu
2017-05-27 16:51                       ` Ananyev, Konstantin
2017-05-29 10:22                         ` Hu, Jiayu
2017-05-29 12:18                           ` Bruce Richardson
2017-05-30 14:10                             ` Hu, Jiayu
2017-05-29 12:51                           ` Ananyev, Konstantin
2017-05-30  5:29                             ` Hu, Jiayu
2017-05-30 11:56                               ` Ananyev, Konstantin
2017-04-24  8:09     ` [dpdk-dev] [PATCH v3 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-04-24  8:09     ` [dpdk-dev] [PATCH v3 3/3] app/testpmd: enable GRO feature Jiayu Hu
2017-06-07  9:24       ` Wu, Jingjing
2017-06-07 11:08     ` [dpdk-dev] [PATCH v4 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-06-07 11:08       ` [dpdk-dev] [PATCH v4 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-07 11:08       ` [dpdk-dev] [PATCH v4 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-07 11:08       ` [dpdk-dev] [PATCH v4 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-06-18  7:21       ` [dpdk-dev] [PATCH v5 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-06-18  7:21         ` [dpdk-dev] [PATCH v5 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-19  4:03           ` Tiwei Bie
2017-06-19  5:16             ` Jiayu Hu
2017-06-19 15:43           ` Tan, Jianfeng
2017-06-19 15:55           ` Stephen Hemminger
2017-06-20  1:48             ` Jiayu Hu
2017-06-18  7:21         ` [dpdk-dev] [PATCH v5 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-19 15:43           ` Tan, Jianfeng
2017-06-20  3:22             ` Jiayu Hu
2017-06-20 15:15               ` Ananyev, Konstantin
2017-06-20 16:16                 ` Jiayu Hu
2017-06-20 15:21               ` Ananyev, Konstantin
2017-06-20 23:30               ` Tan, Jianfeng
2017-06-20 23:55                 ` Stephen Hemminger
2017-06-22  7:39                 ` Jiayu Hu
2017-06-22  8:18             ` Jiayu Hu
2017-06-22  9:35               ` Tan, Jianfeng
2017-06-22 13:55                 ` Jiayu Hu [this message]
2017-06-18  7:21         ` [dpdk-dev] [PATCH v5 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-06-19  1:24           ` Yao, Lei A
2017-06-19  2:27           ` Wu, Jingjing
2017-06-19  3:22             ` Jiayu Hu
2017-06-19  1:39         ` [dpdk-dev] [PATCH v5 0/3] Support TCP/IPv4 GRO in DPDK Tan, Jianfeng
2017-06-19  3:07           ` Jiayu Hu
2017-06-19  5:12             ` Jiayu Hu
2017-06-23 14:43         ` [dpdk-dev] [PATCH v6 " Jiayu Hu
2017-06-23 14:43           ` [dpdk-dev] [PATCH v6 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-25 16:53             ` Tan, Jianfeng
2017-06-23 14:43           ` [dpdk-dev] [PATCH v6 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-25 16:53             ` Tan, Jianfeng
2017-06-26  1:58               ` Jiayu Hu
2017-06-23 14:43           ` [dpdk-dev] [PATCH v6 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-06-24  8:01             ` Yao, Lei A
2017-06-25 16:03           ` [dpdk-dev] [PATCH v6 0/3] Support TCP/IPv4 GRO in DPDK Tan, Jianfeng
2017-06-26  1:35             ` Jiayu Hu
2017-06-26  6:43           ` [dpdk-dev] [PATCH v7 " Jiayu Hu
2017-06-26  6:43             ` [dpdk-dev] [PATCH v7 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-27 23:42               ` Ananyev, Konstantin
2017-06-28  2:17                 ` Jiayu Hu
2017-06-28 17:41                   ` Ananyev, Konstantin
2017-06-29  1:19                     ` Jiayu Hu
2017-06-26  6:43             ` [dpdk-dev] [PATCH v7 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-28 23:56               ` Ananyev, Konstantin
2017-06-29  2:26                 ` Jiayu Hu
2017-06-30 12:07                   ` Ananyev, Konstantin
2017-06-30 15:40                     ` Hu, Jiayu
2017-06-26  6:43             ` [dpdk-dev] [PATCH v7 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-06-29 10:58             ` [dpdk-dev] [PATCH v8 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-06-29 10:58               ` [dpdk-dev] [PATCH v8 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-29 10:58               ` [dpdk-dev] [PATCH v8 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-29 17:51                 ` Stephen Hemminger
2017-06-30  2:07                   ` Jiayu Hu
2017-06-29 10:59               ` [dpdk-dev] [PATCH v8 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-06-30  2:26                 ` Wu, Jingjing
2017-06-30  6:53               ` [dpdk-dev] [PATCH v9 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-06-30  6:53                 ` [dpdk-dev] [PATCH v9 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-06-30  6:53                 ` [dpdk-dev] [PATCH v9 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-06-30  6:53                 ` [dpdk-dev] [PATCH v9 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-01 11:08                 ` [dpdk-dev] [PATCH v10 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-07-01 11:08                   ` [dpdk-dev] [PATCH v10 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-07-02 10:19                     ` Tan, Jianfeng
2017-07-03  5:56                       ` Hu, Jiayu
2017-07-04  8:11                         ` Yuanhan Liu
2017-07-04  8:37                     ` Yuanhan Liu
2017-07-04 16:01                       ` Hu, Jiayu
2017-07-01 11:08                   ` [dpdk-dev] [PATCH v10 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-07-02 10:19                     ` Tan, Jianfeng
2017-07-03  5:13                       ` Hu, Jiayu
2017-07-04  9:03                     ` Yuanhan Liu
2017-07-04 16:03                       ` Hu, Jiayu
2017-07-01 11:08                   ` [dpdk-dev] [PATCH v10 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-05  4:08                   ` [dpdk-dev] [PATCH v11 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-07-05  4:08                     ` [dpdk-dev] [PATCH v11 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-07-07  6:55                       ` Tan, Jianfeng
2017-07-07  9:19                         ` Tan, Jianfeng
2017-07-05  4:08                     ` [dpdk-dev] [PATCH v11 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-07-07  6:55                       ` Tan, Jianfeng
2017-07-05  4:08                     ` [dpdk-dev] [PATCH v11 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-07 10:39                     ` [dpdk-dev] [PATCH v12 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-07-07 10:39                       ` [dpdk-dev] [PATCH v12 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-07-08 16:37                         ` Tan, Jianfeng
2017-07-07 10:39                       ` [dpdk-dev] [PATCH v12 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-07-08 16:37                         ` Tan, Jianfeng
2017-07-07 10:39                       ` [dpdk-dev] [PATCH v12 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-09  1:13                       ` [dpdk-dev] [PATCH v13 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-07-09  1:13                         ` [dpdk-dev] [PATCH v13 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-07-09  1:13                         ` [dpdk-dev] [PATCH v13 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-07-09  1:13                         ` [dpdk-dev] [PATCH v13 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-09  5:46                         ` [dpdk-dev] [PATCH v14 0/3] Support TCP/IPv4 GRO in DPDK Jiayu Hu
2017-07-09  5:46                           ` [dpdk-dev] [PATCH v14 1/3] lib: add Generic Receive Offload API framework Jiayu Hu
2017-07-09  5:46                           ` [dpdk-dev] [PATCH v14 2/3] lib/gro: add TCP/IPv4 GRO support Jiayu Hu
2017-07-09  5:46                           ` [dpdk-dev] [PATCH v14 3/3] app/testpmd: enable TCP/IPv4 GRO Jiayu Hu
2017-07-09  7:59                             ` Yao, Lei A
2017-07-09 16:14                           ` [dpdk-dev] [PATCH v14 0/3] Support TCP/IPv4 GRO in DPDK Thomas Monjalon
2017-07-10  2:21                             ` Hu, Jiayu
2017-07-10  7:03                               ` Thomas Monjalon

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