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{
    "id": 29767,
    "url": "https://patches.dpdk.org/api/patches/29767/?format=api",
    "web_url": "https://patches.dpdk.org/project/dpdk/patch/1507218244-29568-7-git-send-email-mark.b.kavanagh@intel.com/",
    "project": {
        "id": 1,
        "url": "https://patches.dpdk.org/api/projects/1/?format=api",
        "name": "DPDK",
        "link_name": "dpdk",
        "list_id": "dev.dpdk.org",
        "list_email": "dev@dpdk.org",
        "web_url": "http://core.dpdk.org",
        "scm_url": "git://dpdk.org/dpdk",
        "webscm_url": "http://git.dpdk.org/dpdk",
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    "msgid": "<1507218244-29568-7-git-send-email-mark.b.kavanagh@intel.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/1507218244-29568-7-git-send-email-mark.b.kavanagh@intel.com",
    "date": "2017-10-05T15:44:04",
    "name": "[dpdk-dev,v8,6/6] doc: add GSO programmer's guide",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "9e6f9651c907ed1d429a93aec6a56303e8dae03a",
    "submitter": {
        "id": 133,
        "url": "https://patches.dpdk.org/api/people/133/?format=api",
        "name": "Mark Kavanagh",
        "email": "mark.b.kavanagh@intel.com"
    },
    "delegate": null,
    "mbox": "https://patches.dpdk.org/project/dpdk/patch/1507218244-29568-7-git-send-email-mark.b.kavanagh@intel.com/mbox/",
    "series": [],
    "comments": "https://patches.dpdk.org/api/patches/29767/comments/",
    "check": "fail",
    "checks": "https://patches.dpdk.org/api/patches/29767/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<dev-bounces@dpdk.org>",
        "X-Original-To": "patchwork@dpdk.org",
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        "Received": [
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        "X-IronPort-AV": "E=Sophos; i=\"5.42,481,1500966000\"; d=\"scan'208\";\n\ta=\"1202622069\"",
        "From": "Mark Kavanagh <mark.b.kavanagh@intel.com>",
        "To": "dev@dpdk.org",
        "Cc": "jiayu.hu@intel.com, jianfeng.tan@intel.com, konstantin.ananyev@intel.com,\n\tferruh.yigit@intel.com, thomas@monjalon.net,\n\tMark Kavanagh <mark.b.kavanagh@intel.com>",
        "Date": "Thu,  5 Oct 2017 16:44:04 +0100",
        "Message-Id": "<1507218244-29568-7-git-send-email-mark.b.kavanagh@intel.com>",
        "X-Mailer": "git-send-email 1.7.0.7",
        "In-Reply-To": "<1507201331-228465-1-git-send-email-mark.b.kavanagh@intel.com>",
        "References": "<1507201331-228465-1-git-send-email-mark.b.kavanagh@intel.com>",
        "Subject": "[dpdk-dev] [PATCH v8 6/6] doc: add GSO programmer's guide",
        "X-BeenThere": "dev@dpdk.org",
        "X-Mailman-Version": "2.1.15",
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    },
    "content": "Add programmer's guide doc to explain the design and use of the\nGSO library.\n\nSigned-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>\nSigned-off-by: Jiayu Hu <jiayu.hu@intel.com>\n---\n MAINTAINERS                                        |   6 +\n .../generic_segmentation_offload_lib.rst           | 256 +++++++++++\n .../prog_guide/img/gso-output-segment-format.svg   | 313 ++++++++++++++\n doc/guides/prog_guide/img/gso-three-seg-mbuf.svg   | 477 +++++++++++++++++++++\n doc/guides/prog_guide/index.rst                    |   1 +\n 5 files changed, 1053 insertions(+)\n create mode 100644 doc/guides/prog_guide/generic_segmentation_offload_lib.rst\n create mode 100644 doc/guides/prog_guide/img/gso-output-segment-format.svg\n create mode 100644 doc/guides/prog_guide/img/gso-three-seg-mbuf.svg",
    "diff": "diff --git a/MAINTAINERS b/MAINTAINERS\nindex 8df2a7f..8f0a4bd 100644\n--- a/MAINTAINERS\n+++ b/MAINTAINERS\n@@ -644,6 +644,12 @@ M: Jiayu Hu <jiayu.hu@intel.com>\n F: lib/librte_gro/\n F: doc/guides/prog_guide/generic_receive_offload_lib.rst\n \n+Generic Segmentation Offload\n+M: Jiayu Hu <jiayu.hu@intel.com>\n+M: Mark Kavanagh <mark.b.kavanagh@intel.com>\n+F: lib/librte_gso/\n+F: doc/guides/prog_guide/generic_segmentation_offload_lib.rst\n+\n Distributor\n M: Bruce Richardson <bruce.richardson@intel.com>\n M: David Hunt <david.hunt@intel.com>\ndiff --git a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst\nnew file mode 100644\nindex 0000000..5e78f16\n--- /dev/null\n+++ b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst\n@@ -0,0 +1,256 @@\n+..  BSD LICENSE\n+    Copyright(c) 2017 Intel Corporation. All rights reserved.\n+    All rights reserved.\n+\n+    Redistribution and use in source and binary forms, with or without\n+    modification, are permitted provided that the following conditions\n+    are met:\n+\n+    * Redistributions of source code must retain the above copyright\n+    notice, this list of conditions and the following disclaimer.\n+    * Redistributions in binary form must reproduce the above copyright\n+    notice, this list of conditions and the following disclaimer in\n+    the documentation and/or other materials provided with the\n+    distribution.\n+    * Neither the name of Intel Corporation nor the names of its\n+    contributors may be used to endorse or promote products derived\n+    from this software without specific prior written permission.\n+\n+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n+    \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n+\n+Generic Segmentation Offload Library\n+====================================\n+\n+Overview\n+--------\n+Generic Segmentation Offload (GSO) is a widely used software implementation of\n+TCP Segmentation Offload (TSO), which reduces per-packet processing overhead.\n+Much like TSO, GSO gains performance by enabling upper layer applications to\n+process a smaller number of large packets (e.g. MTU size of 64KB), instead of\n+processing higher numbers of small packets (e.g. MTU size of 1500B), thus\n+reducing per-packet overhead.\n+\n+For example, GSO allows guest kernel stacks to transmit over-sized TCP segments\n+that far exceed the kernel interface's MTU; this eliminates the need to segment\n+packets within the guest, and improves the data-to-overhead ratio of both the\n+guest-host link, and PCI bus. The expectation of the guest network stack in this\n+scenario is that segmentation of egress frames will take place either in the NIC\n+HW, or where that hardware capability is unavailable, either in the host\n+application, or network stack.\n+\n+Bearing that in mind, the GSO library enables DPDK applications to segment\n+packets in software. Note however, that GSO is implemented as a standalone\n+library, and not via a 'fallback' mechanism (i.e. for when TSO is unsupported\n+in the underlying hardware); that is, applications must explicitly invoke the\n+GSO library to segment packets. The size of GSO segments ``(segsz)`` is\n+configurable by the application.\n+\n+Limitations\n+-----------\n+\n+#. The GSO library doesn't check if input packets have correct checksums.\n+\n+#. In addition, the GSO library doesn't re-calculate checksums for segmented\n+   packets (that task is left to the application).\n+\n+#. IP fragments are unsupported by the GSO library.\n+\n+#. The egress interface's driver must support multi-segment packets.\n+\n+#. Currently, the GSO library supports the following IPv4 packet types:\n+\n+ - TCP\n+ - VxLAN\n+ - GRE\n+\n+  See `Supported GSO Packet Types`_ for further details.\n+\n+Packet Segmentation\n+-------------------\n+\n+The ``rte_gso_segment()`` function is the GSO library's primary\n+segmentation API.\n+\n+Before performing segmentation, an application must create a GSO context object\n+``(struct rte_gso_ctx)``, which provides the library with some of the\n+information required to understand how the packet should be segmented. Refer to\n+`How to Segment a Packet`_ for additional details on same. Once the GSO context\n+has been created, and populated, the application can then use the\n+``rte_gso_segment()`` function to segment packets.\n+\n+The GSO library typically stores each segment that it creates in two parts: the\n+first part contains a copy of the original packet's headers, while the second\n+part contains a pointer to an offset within the original packet. This mechanism\n+is explained in more detail in `GSO Output Segment Format`_.\n+\n+The GSO library supports both single- and multi-segment input mbufs.\n+\n+GSO Output Segment Format\n+~~~~~~~~~~~~~~~~~~~~~~~~~\n+To reduce the number of expensive memcpy operations required when segmenting a\n+packet, the GSO library typically stores each segment that it creates as a\n+two-part mbuf (technically, this is termed a 'two-segment' mbuf; however, since\n+the elements produced by the API are also called 'segments', for clarity the\n+term 'part' is used here instead).\n+\n+The first part of each output segment is a direct mbuf and contains a copy of\n+the original packet's headers, which must be prepended to each output segment.\n+These headers are copied from the original packet into each output segment.\n+\n+The second part of each output segment, represents a section of data from the\n+original packet, i.e. a data segment. Rather than copy the data directly from\n+the original packet into the output segment (which would impact performance\n+considerably), the second part of each output segment is an indirect mbuf,\n+which contains no actual data, but simply points to an offset within the\n+original packet.\n+\n+The combination of the 'header' segment and the 'data' segment constitutes a\n+single logical output GSO segment of the original packet. This is illustrated\n+in :numref:`figure_gso-output-segment-format`.\n+\n+.. _figure_gso-output-segment-format:\n+\n+.. figure:: img/gso-output-segment-format.svg\n+   :align: center\n+\n+   Two-part GSO output segment\n+\n+In one situation, the output segment may contain additional 'data' segments.\n+This only occurs when:\n+\n+- the input packet on which GSO is to be performed is represented by a\n+  multi-segment mbuf.\n+\n+- the output segment is required to contain data that spans the boundaries\n+  between segments of the input multi-segment mbuf.\n+\n+The GSO library traverses each segment of the input packet, and produces\n+numerous output segments; for optimal performance, the number of output\n+segments is kept to a minimum. Consequently, the GSO library maximizes the\n+amount of data contained within each output segment; i.e. each output segment\n+``segsz`` bytes of data. The only exception to this is in the case of the very\n+final output segment; if ``pkt_len`` % ``segsz``, then the final segment is\n+smaller than the rest.\n+\n+In order for an output segment to meet its MSS, it may need to include data from\n+multiple input segments. Due to the nature of indirect mbufs (each indirect mbuf\n+can point to only one direct mbuf), the solution here is to add another indirect\n+mbuf to the output segment; this additional segment then points to the next\n+input segment. If necessary, this chaining process is repeated, until the sum of\n+all of the data 'contained' in the output segment reaches ``segsz``. This\n+ensures that the amount of data contained within each output segment is uniform,\n+with the possible exception of the last segment, as previously described.\n+\n+:numref:`figure_gso-three-seg-mbuf` illustrates an example of a three-part\n+output segment. In this example, the output segment needs to include data from\n+the end of one input segment, and the beginning of another. To achieve this,\n+an additional indirect mbuf is chained to the second part of the output segment,\n+and is attached to the next input segment (i.e. it points to the data in the\n+next input segment).\n+\n+.. _figure_gso-three-seg-mbuf:\n+\n+.. figure:: img/gso-three-seg-mbuf.svg\n+   :align: center\n+\n+   Three-part GSO output segment\n+\n+Supported GSO Packet Types\n+--------------------------\n+\n+TCP/IPv4 GSO\n+~~~~~~~~~~~~\n+TCP/IPv4 GSO supports segmentation of suitably large TCP/IPv4 packets, which\n+may also contain an optional VLAN tag.\n+\n+VxLAN GSO\n+~~~~~~~~~\n+VxLAN packets GSO supports segmentation of suitably large VxLAN packets,\n+which contain an outer IPv4 header, inner TCP/IPv4 headers, and optional\n+inner and/or outer VLAN tag(s).\n+\n+GRE GSO\n+~~~~~~~\n+GRE GSO supports segmentation of suitably large GRE packets, which contain\n+an outer IPv4 header, inner TCP/IPv4 headers, and an optional VLAN tag.\n+\n+How to Segment a Packet\n+-----------------------\n+\n+To segment an outgoing packet, an application must:\n+\n+#. First create a GSO context ``(struct rte_gso_ctx)``; this contains:\n+\n+   - a pointer to the mbuf pool for allocating the direct buffers, which are\n+     used to store the GSO segments' packet headers.\n+\n+   - a pointer to the mbuf pool for allocating indirect buffers, which are\n+     used to locate GSO segments' packet payloads.\n+\n+.. note::\n+\n+     An application may use the same pool for both direct and indirect\n+     buffers. However, since each indirect mbuf simply stores a pointer, the\n+     application may reduce its memory consumption by creating a separate memory\n+     pool, containing smaller elements, for the indirect pool.\n+\n+   - the size of each output segment, including packet headers and payload,\n+     measured in bytes.\n+\n+   - the bit mask of required GSO types. The GSO library uses the same macros as\n+     those that describe a physical device's TX offloading capabilities (i.e.\n+     ``DEV_TX_OFFLOAD_*_TSO``) for gso_types. For example, if an application\n+     wants to segment TCP/IPv4 packets, it should set gso_types to\n+     ``DEV_TX_OFFLOAD_TCP_TSO``. The only other supported values currently\n+     supported for gso_types are ``DEV_TX_OFFLOAD_VXLAN_TNL_TSO``, and\n+     ``DEV_TX_OFFLOAD_GRE_TNL_TSO``; a combination of these macros is also\n+     allowed.\n+\n+   - a flag, that indicates whether the IPv4 headers of output segments should\n+     contain fixed or incremental ID values.\n+\n+2. Set the appropriate ol_flags in the mbuf.\n+\n+   - The GSO library use the value of an mbuf's ``ol_flags`` attribute to\n+     to determine how a packet should be segmented. It is the application's\n+     responsibility to ensure that these flags are set.\n+\n+   - For example, in order to segment TCP/IPv4 packets, the application should\n+     add the ``PKT_TX_IPV4`` and ``PKT_TX_TCP_SEG`` flags to the mbuf's\n+     ol_flags.\n+\n+   - If checksum calculation in hardware is required, the application should\n+     also add the ``PKT_TX_TCP_CKSUM`` and ``PKT_TX_IP_CKSUM`` flags.\n+\n+#. Check if the packet should be processed. Packets with one of the\n+   following properties are not processed and are returned immediately:\n+\n+   - Packet length is less than ``segsz`` (i.e. GSO is not required).\n+\n+   - Packet type is not supported by GSO library (see\n+     `Supported GSO Packet Types`_).\n+\n+   - Application has not enabled GSO support for the packet type.\n+\n+   - Packet's ol_flags have been incorrectly set.\n+\n+#. Allocate space in which to store the output GSO segments. If the amount of\n+   space allocated by the application is insufficient, segmentation will fail.\n+\n+#. Invoke the GSO segmentation API, ``rte_gso_segment()``.\n+\n+#. If required, update the L3 and L4 checksums of the newly-created segments.\n+   For tunneled packets, the outer IPv4 headers' checksums should also be\n+   updated. 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ip_fragment_reassembly_lib\n     generic_receive_offload_lib\n+    generic_segmentation_offload_lib\n     pdump_lib\n     multi_proc_support\n     kernel_nic_interface\n",
    "prefixes": [
        "dpdk-dev",
        "v8",
        "6/6"
    ]
}