From: "Kavanagh, Mark B" <mark.b.kavanagh@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Hu, Jiayu" <jiayu.hu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Tan, Jianfeng" <jianfeng.tan@intel.com>
Subject: Re: [dpdk-dev] [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK
Date: Wed, 30 Aug 2017 13:32:23 +0000 [thread overview]
Message-ID: <DC5AD7FA266D86499789B1BCAEC715F8C31A777E@IRSMSX101.ger.corp.intel.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB9772584F23E240@IRSMSX103.ger.corp.intel.com>
>From: Ananyev, Konstantin
>Sent: Wednesday, August 30, 2017 11:49 AM
>To: Hu, Jiayu <jiayu.hu@intel.com>
>Cc: dev@dpdk.org; Kavanagh, Mark B <mark.b.kavanagh@intel.com>; Tan, Jianfeng
><jianfeng.tan@intel.com>
>Subject: RE: [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK
>
>
>
>> -----Original Message-----
>> From: Hu, Jiayu
>> Sent: Wednesday, August 30, 2017 8:37 AM
>> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>
>> Cc: dev@dpdk.org; Kavanagh, Mark B <mark.b.kavanagh@intel.com>; Tan,
>Jianfeng <jianfeng.tan@intel.com>
>> Subject: Re: [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK
>>
>> Hi Konstantin,
>>
>> Thanks for your suggestions. Feedbacks are inline.
>>
>> Thanks,
>> Jiayu
>>
>> On Wed, Aug 30, 2017 at 09:37:42AM +0800, Ananyev, Konstantin wrote:
>> >
>> > Hi Jiayu,
>> > Few questions/comments from me below in in next few mails.
>> > Thanks
>> > Konstantin
>> >
>> > >
>> > > Generic Segmentation Offload (GSO) is a SW technique to split large
>> > > packets into small ones. Akin to TSO, GSO enables applications to
>> > > operate on large packets, thus reducing per-packet processing overhead.
>> > >
>> > > To enable more flexibility to applications, DPDK GSO is implemented
>> > > as a standalone library. Applications explicitly use the GSO library
>> > > to segment packets. This patch adds GSO support to DPDK for specific
>> > > packet types: specifically, TCP/IPv4, VxLAN, and GRE.
>> > >
>> > > The first patch introduces the GSO API framework. The second patch
>> > > adds GSO support for TCP/IPv4 packets (containing an optional VLAN
>> > > tag). The third patch adds GSO support for VxLAN packets that contain
>> > > outer IPv4, and inner TCP/IPv4 headers (plus optional inner and/or
>> > > outer VLAN tags). The fourth patch adds GSO support for GRE packets
>> > > that contain outer IPv4, and inner TCP/IPv4 headers (with optional
>> > > outer VLAN tag). The last patch in the series enables TCP/IPv4, VxLAN,
>> > > and GRE GSO in testpmd's checksum forwarding engine.
>> > >
>> > > The performance of TCP/IPv4 GSO on a 10Gbps link is demonstrated using
>> > > iperf. Setup for the test is described as follows:
>> > >
>> > > a. Connect 2 x 10Gbps physical ports (P0, P1), together physically.
>> > > b. Launch testpmd with P0 and a vhost-user port, and use csum
>> > > forwarding engine.
>> > > c. Select IP and TCP HW checksum calculation for P0; select TCP HW
>> > > checksum calculation for vhost-user port.
>> > > d. Launch a VM with csum and tso offloading enabled.
>> > > e. Run iperf-client on virtio-net port in the VM to send TCP packets.
>> >
>> > Not sure I understand the setup correctly:
>> > So testpmd forwards packets between P0 and vhost-user port, right?
>>
>> Yes.
>>
>> > And who uses P1? iperf-server over linux kernel?
>>
>> P1 is possessed by linux kernel.
>>
>> > Also is P1 on another box or not?
>>
>> P0 and P1 are in the same machine and are connected physically.
>>
>> >
>> > >
>> > > With GSO enabled for P0 in testpmd, observed iperf throughput is ~9Gbps.
>> >
>> > Ok, and if GSO is disabled what is the throughput?
>> > Another stupid question: if P0 is physical 10G (ixgbe?) we can just enable
>a TSO on it, right?
>> > If so, what would be the TSO numbers here?
>>
>> Here are more detailed experiment information:
>>
>> test1: only enable GSO for p0, GSO size is 1518, use two iperf-clients (i.e.
>"-P 2")
>> test2: only enable TSO for p0, TSO size is 1518, use two iperf-clients
>> test3: disable TSO and GSO, use two iperf-clients
>>
>> test1 performance: 8.6Gpbs
>> test2 throughput: 9.5Gbps
>> test3 throughput: 3Mbps
>
>Ok thanks for detailed explanation.
>I' d suggest you put it into next version cover letter.
Thanks Konstantin - will do.
>
>>
>> >
>> > In fact, could you probably explain a bit more, what supposed to be a main
>usage model for that library?
>>
>> The GSO library is just a SW segmentation method, which can be used by
>applications, like OVS.
>> Currently, most of NICs supports to segment TCP and UDP packets, but not for
>all NICs. So current
>> OVS doesn't enable TSO, as a result of lacking a SW segmentation fallback.
>Besides, the protocol
>> types in HW segmentation are limited. So it's necessary to provide a SW
>segmentation solution.
>>
>> With the GSO library, OVS and other applications are able to receive large
>packets from VMs and
>> process these large packets, instead of standard ones (i.e. 1518B). So the
>per-packet overhead is
>> reduced, since the number of packets needed processing is much fewer.
>
>Ok, just for my curiosity what is the size of the packets coming from VM?
>Konstantin
In the case of TSO (and as a corollary, GSO), I guess that the packet size is bounded to ~64k. In OvS, that packet is dequeued using the rte_vhost_dequeue_burst API, and stored in an mbuf chain. The data capacity of mbufs in OvS is user-defined, up to a limit of 9728B.
Thanks,
Mark
>
>
>>
>> > Is that to perform segmentation on (virtual) devices that doesn't support
>HW TSO or ...?
>>
>> When launch qemu with enabling TSO or GSO, the virtual device doesn't really
>do segmentation.
>> It directly sends large packets. Therefore, testpmd can receive large
>packets from the VM and
>> then perform GSO. The GSO/TSO behavior of virtual devices is different from
>physical NICs.
>>
>> > Again would it be for a termination point (packets were just formed and
>filled) by the caller,
>> > or is that for box in the middle which just forwards packets between
>nodes?
>> > If the later one, then we'll probably already have most of our packets
>segmented properly, no?
>> >
>> > > The experimental data of VxLAN and GRE will be shown later.
>> > >
>> > > Jiayu Hu (3):
>> > > lib: add Generic Segmentation Offload API framework
>> > > gso/lib: add TCP/IPv4 GSO support
>> > > app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO
>> > >
>> > > Mark Kavanagh (2):
>> > > lib/gso: add VxLAN GSO support
>> > > lib/gso: add GRE GSO support
>> > >
>> > > app/test-pmd/cmdline.c | 121 +++++++++
>> > > app/test-pmd/config.c | 25 ++
>> > > app/test-pmd/csumonly.c | 68 ++++-
>> > > app/test-pmd/testpmd.c | 9 +
>> > > app/test-pmd/testpmd.h | 10 +
>> > > config/common_base | 5 +
>> > > lib/Makefile | 2 +
>> > > lib/librte_eal/common/include/rte_log.h | 1 +
>> > > lib/librte_gso/Makefile | 52 ++++
>> > > lib/librte_gso/gso_common.c | 431
>++++++++++++++++++++++++++++++++
>> > > lib/librte_gso/gso_common.h | 180 +++++++++++++
>> > > lib/librte_gso/gso_tcp.c | 82 ++++++
>> > > lib/librte_gso/gso_tcp.h | 73 ++++++
>> > > lib/librte_gso/gso_tunnel.c | 62 +++++
>> > > lib/librte_gso/gso_tunnel.h | 46 ++++
>> > > lib/librte_gso/rte_gso.c | 100 ++++++++
>> > > lib/librte_gso/rte_gso.h | 122 +++++++++
>> > > lib/librte_gso/rte_gso_version.map | 7 +
>> > > mk/rte.app.mk | 1 +
>> > > 19 files changed, 1392 insertions(+), 5 deletions(-)
>> > > create mode 100644 lib/librte_gso/Makefile
>> > > create mode 100644 lib/librte_gso/gso_common.c
>> > > create mode 100644 lib/librte_gso/gso_common.h
>> > > create mode 100644 lib/librte_gso/gso_tcp.c
>> > > create mode 100644 lib/librte_gso/gso_tcp.h
>> > > create mode 100644 lib/librte_gso/gso_tunnel.c
>> > > create mode 100644 lib/librte_gso/gso_tunnel.h
>> > > create mode 100644 lib/librte_gso/rte_gso.c
>> > > create mode 100644 lib/librte_gso/rte_gso.h
>> > > create mode 100644 lib/librte_gso/rte_gso_version.map
>> > >
>> > > --
>> > > 2.7.4
next prev parent reply other threads:[~2017-08-30 13:36 UTC|newest]
Thread overview: 157+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-24 14:15 Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 1/5] lib: add Generic Segmentation Offload API framework Jiayu Hu
2017-08-30 1:38 ` Ananyev, Konstantin
2017-08-30 7:57 ` Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 2/5] gso/lib: add TCP/IPv4 GSO support Jiayu Hu
2017-08-30 1:38 ` Ananyev, Konstantin
2017-08-30 2:55 ` Jiayu Hu
2017-08-30 9:25 ` Kavanagh, Mark B
2017-08-30 9:39 ` Ananyev, Konstantin
2017-08-30 9:59 ` Ananyev, Konstantin
2017-08-30 13:27 ` Kavanagh, Mark B
2017-08-30 9:03 ` Jiayu Hu
2017-09-04 3:31 ` Jiayu Hu
2017-09-04 9:54 ` Ananyev, Konstantin
2017-09-05 1:09 ` Hu, Jiayu
2017-09-11 13:04 ` Ananyev, Konstantin
2017-08-24 14:15 ` [dpdk-dev] [PATCH 3/5] lib/gso: add VxLAN " Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 4/5] lib/gso: add GRE " Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-08-30 1:37 ` [dpdk-dev] [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Ananyev, Konstantin
2017-08-30 7:36 ` Jiayu Hu
2017-08-30 10:49 ` Ananyev, Konstantin
2017-08-30 13:32 ` Kavanagh, Mark B [this message]
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 3/5] gso: add VxLAN " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 4/5] gso: add GRE " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-12 10:36 ` Ananyev, Konstantin
2017-09-13 2:11 ` Jiayu Hu
2017-09-14 18:33 ` Ferruh Yigit
2017-09-15 1:12 ` Hu, Jiayu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-12 11:17 ` Ananyev, Konstantin
2017-09-13 2:48 ` Jiayu Hu
2017-09-13 9:38 ` Ananyev, Konstantin
2017-09-13 10:23 ` Hu, Jiayu
2017-09-13 14:52 ` Kavanagh, Mark B
2017-09-13 15:13 ` Ananyev, Konstantin
2017-09-14 0:59 ` Hu, Jiayu
2017-09-14 8:35 ` Kavanagh, Mark B
2017-09-14 8:39 ` Ananyev, Konstantin
2017-09-14 9:00 ` Kavanagh, Mark B
2017-09-14 9:10 ` Ananyev, Konstantin
2017-09-14 9:35 ` Kavanagh, Mark B
2017-09-12 14:17 ` Ananyev, Konstantin
2017-09-13 10:44 ` Jiayu Hu
2017-09-13 22:10 ` Ananyev, Konstantin
2017-09-14 6:07 ` Jiayu Hu
2017-09-14 8:47 ` Ananyev, Konstantin
2017-09-14 9:29 ` Hu, Jiayu
2017-09-14 9:35 ` Ananyev, Konstantin
2017-09-14 10:01 ` Hu, Jiayu
2017-09-14 15:42 ` Kavanagh, Mark B
2017-09-14 18:38 ` Ananyev, Konstantin
2017-09-15 7:54 ` Hu, Jiayu
2017-09-15 8:15 ` Ananyev, Konstantin
2017-09-15 8:17 ` Ananyev, Konstantin
2017-09-15 8:38 ` Hu, Jiayu
2017-09-14 8:51 ` Kavanagh, Mark B
2017-09-14 9:45 ` Hu, Jiayu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 3/5] gso: add VxLAN " Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 4/5] gso: add GRE " Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-14 18:33 ` Ferruh Yigit
2017-09-15 1:13 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Jiayu Hu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-20 7:03 ` Yao, Lei A
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 3/5] gso: add VxLAN " Jiayu Hu
2017-09-20 3:11 ` Tan, Jianfeng
2017-09-20 3:17 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 4/5] gso: add GRE " Jiayu Hu
2017-09-20 2:53 ` Tan, Jianfeng
2017-09-20 6:01 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 0/6] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Mark Kavanagh
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 0/6] Support TCP/IPv4, VxLAN, " Mark Kavanagh
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-04 13:11 ` Ananyev, Konstantin
2017-10-04 13:21 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-04 13:32 ` Ananyev, Konstantin
2017-10-04 14:30 ` Kavanagh, Mark B
2017-10-04 14:49 ` Ananyev, Konstantin
2017-10-04 14:59 ` Kavanagh, Mark B
2017-10-04 13:35 ` Ananyev, Konstantin
2017-10-04 14:22 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-04 14:12 ` Ananyev, Konstantin
2017-10-04 14:35 ` Kavanagh, Mark B
2017-10-04 16:13 ` Kavanagh, Mark B
2017-10-04 16:17 ` Ananyev, Konstantin
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 4/6] gso: add GRE " Mark Kavanagh
2017-10-04 14:15 ` Ananyev, Konstantin
2017-10-04 14:36 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-04 15:08 ` Ananyev, Konstantin
2017-10-04 16:23 ` Kavanagh, Mark B
2017-10-04 16:26 ` Ananyev, Konstantin
2017-10-04 16:51 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-04 13:51 ` Mcnamara, John
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-05 13:22 ` [dpdk-dev] [PATCH v7 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Ananyev, Konstantin
2017-10-05 14:39 ` Kavanagh, Mark B
2017-10-05 15:43 ` [dpdk-dev] [PATCH v8 " Mark Kavanagh
2017-10-05 17:12 ` Ananyev, Konstantin
2017-10-05 20:16 ` Kavanagh, Mark B
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 " Mark Kavanagh
2017-10-05 22:24 ` Ananyev, Konstantin
2017-10-06 8:24 ` [dpdk-dev] FW: " Kavanagh, Mark B
2017-10-06 10:35 ` [dpdk-dev] " Kavanagh, Mark B
2017-10-06 23:32 ` Ferruh Yigit
2017-10-06 23:34 ` Ferruh Yigit
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 1/6] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 2/6] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 3/6] gso: add VxLAN " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 4/6] gso: add GRE " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 6/6] doc: add GSO programmer's guide Jiayu Hu
2017-10-08 3:40 ` [dpdk-dev] [PATCH v10 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Ferruh Yigit
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-06 13:34 ` Mcnamara, John
2017-10-06 13:41 ` Kavanagh, Mark B
2017-10-05 15:43 ` [dpdk-dev] [PATCH v8 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-05 17:57 ` Mcnamara, John
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-09-29 3:12 ` Jiayu Hu
2017-09-29 9:05 ` Kavanagh, Mark B
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 3/6] gso: add VxLAN " Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 4/6] gso: add GRE " Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-09-28 22:18 ` [dpdk-dev] [PATCH v5 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
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