From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 522791BE1E for ; Fri, 6 Jul 2018 02:54:30 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jul 2018 17:54:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,314,1526367600"; d="scan'208";a="213788580" Received: from dpdk15.sh.intel.com ([10.67.111.146]) by orsmga004.jf.intel.com with ESMTP; 05 Jul 2018 17:54:29 -0700 From: Jiayu Hu To: dev@dpdk.org Cc: thomas@monjalon.net, Jiayu Hu Date: Fri, 6 Jul 2018 09:02:24 +0800 Message-Id: <1530838944-51791-4-git-send-email-jiayu.hu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530838944-51791-1-git-send-email-jiayu.hu@intel.com> References: <1529646843-45903-1-git-send-email-jiayu.hu@intel.com> <1530838944-51791-1-git-send-email-jiayu.hu@intel.com> Subject: [dpdk-dev] [PATCH v4 3/3] gso: update documents for UDP/IPv4 GSO X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Jul 2018 00:54:31 -0000 This patch updates the programmer guide and testpmd user guide for UDP/IPv4 GSO. Signed-off-by: Jiayu Hu Acked-by: Xiao Wang --- doc/guides/prog_guide/generic_segmentation_offload_lib.rst | 10 ++++++++++ doc/guides/testpmd_app_ug/testpmd_funcs.rst | 7 +++++++ 2 files changed, 17 insertions(+) diff --git a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst index 9959f0d..0cfc119 100644 --- a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst +++ b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst @@ -43,6 +43,7 @@ Limitations #. Currently, the GSO library supports the following IPv4 packet types: - TCP + - UDP - VxLAN - GRE @@ -146,6 +147,15 @@ TCP/IPv4 GSO TCP/IPv4 GSO supports segmentation of suitably large TCP/IPv4 packets, which may also contain an optional VLAN tag. +UDP/IPv4 GSO +~~~~~~~~~~~~ +UDP/IPv4 GSO supports segmentation of suitably large UDP/IPv4 packets, which +may also contain an optional VLAN tag. UDP GSO is the same as IP fragmentation. +Specifically, UDP GSO treats the UDP header as a part of the payload and +does not modify it during segmentation. Therefore, after UDP GSO, only the +first output packet has the original UDP header, and others just have l2 +and l3 headers. + VxLAN GSO ~~~~~~~~~ VxLAN packets GSO supports segmentation of suitably large VxLAN packets, diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst index 0d6fd50..6f2de24 100644 --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst @@ -1059,6 +1059,13 @@ By default, GSO is disabled for all ports. testpmd> csum set tcp hw + UDP GSO is the same as IP fragmentation, which treats the UDP header + as the payload and does not modify it during segmentation. That is, + after UDP GSO, only the first output fragment has the original UDP + header. Therefore, users need to enable HW IP checksum calculation + and SW UDP checksum calculation for GSO-enabled ports, if they want + correct checksums for UDP/IPv4 packets. + set gso segsz ~~~~~~~~~~~~~ -- 2.7.4