[dpdk-dev] [PATCH v3 1/5] gso: add Generic Segmentation Offload API framework
jiayu.hu at intel.com
Fri Sep 15 03:12:16 CEST 2017
> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Friday, September 15, 2017 2:33 AM
> To: Hu, Jiayu <jiayu.hu at intel.com>; dev at dpdk.org
> Cc: Ananyev, Konstantin <konstantin.ananyev at intel.com>; Kavanagh, Mark
> B <mark.b.kavanagh at intel.com>; Tan, Jianfeng <jianfeng.tan at intel.com>
> Subject: Re: [dpdk-dev] [PATCH v3 1/5] gso: add Generic Segmentation
> Offload API framework
> On 9/12/2017 3:43 AM, Jiayu Hu wrote:
> > 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 introduces the GSO API framework to DPDK.
> > The GSO library provides a segmentation API, rte_gso_segment(), for
> > applications. It splits an input packet into small ones in each
> > invocation. The GSO library refers to these small packets generated
> > by rte_gso_segment() as GSO segments. Each of the newly-created GSO
> > segments is organized as a two-segment MBUF, where the first segment is
> > standard MBUF, which stores a copy of packet header, and the second is an
> > indirect MBUF which points to a section of data in the input packet.
> > rte_gso_segment() reduces the refcnt of the input packet by 1. Therefore,
> > when all GSO segments are freed, the input packet is freed automatically.
> > Additionally, since each GSO segment has multiple MBUFs (i.e. 2 MBUFs),
> > the driver of the interface which the GSO segments are sent to should
> > support to transmit multi-segment packets.
> > Signed-off-by: Jiayu Hu <jiayu.hu at intel.com>
> > Signed-off-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
> > ---
> > config/common_base | 5 ++
> > lib/Makefile | 2 +
> > lib/librte_gso/Makefile | 49 ++++++++++++++
> > lib/librte_gso/rte_gso.c | 50 ++++++++++++++
> > lib/librte_gso/rte_gso.h | 133
> > lib/librte_gso/rte_gso_version.map | 7 ++
> > mk/rte.app.mk | 1 +
> Can you please update documentation for new library:
> - library documentation "doc/guides/prog_guide/xxx.rst"
> - api documentation: doc/api/doxy-api.conf, doc/api/doxy-api-index.md
> - release notes update to announce new library
> - release notes, "Shared Library Versions" section with new library.
Thanks for your reminder. I will update them sooner.
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