doc: add GSO programmer's guide
authorMark Kavanagh <mark.b.kavanagh@intel.com>
Sat, 7 Oct 2017 14:56:44 +0000 (22:56 +0800)
committerFerruh Yigit <ferruh.yigit@intel.com>
Thu, 12 Oct 2017 00:36:57 +0000 (01:36 +0100)
Add programmer's guide doc to explain the design and use of the
GSO library.

Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
MAINTAINERS
doc/guides/prog_guide/generic_segmentation_offload_lib.rst [new file with mode: 0644]
doc/guides/prog_guide/img/gso-output-segment-format.svg [new file with mode: 0644]
doc/guides/prog_guide/img/gso-three-seg-mbuf.svg [new file with mode: 0644]
doc/guides/prog_guide/index.rst

index 2f3e106..8268ae1 100644 (file)
@@ -655,6 +655,12 @@ M: Jiayu Hu <jiayu.hu@intel.com>
 F: lib/librte_gro/
 F: doc/guides/prog_guide/generic_receive_offload_lib.rst
 
+Generic Segmentation Offload
+M: Jiayu Hu <jiayu.hu@intel.com>
+M: Mark Kavanagh <mark.b.kavanagh@intel.com>
+F: lib/librte_gso/
+F: doc/guides/prog_guide/generic_segmentation_offload_lib.rst
+
 Distributor
 M: Bruce Richardson <bruce.richardson@intel.com>
 M: David Hunt <david.hunt@intel.com>
diff --git a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst
new file mode 100644 (file)
index 0000000..5e78f16
--- /dev/null
@@ -0,0 +1,256 @@
+..  BSD LICENSE
+    Copyright(c) 2017 Intel Corporation. All rights reserved.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+    * Neither the name of Intel Corporation nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Generic Segmentation Offload Library
+====================================
+
+Overview
+--------
+Generic Segmentation Offload (GSO) is a widely used software implementation of
+TCP Segmentation Offload (TSO), which reduces per-packet processing overhead.
+Much like TSO, GSO gains performance by enabling upper layer applications to
+process a smaller number of large packets (e.g. MTU size of 64KB), instead of
+processing higher numbers of small packets (e.g. MTU size of 1500B), thus
+reducing per-packet overhead.
+
+For example, GSO allows guest kernel stacks to transmit over-sized TCP segments
+that far exceed the kernel interface's MTU; this eliminates the need to segment
+packets within the guest, and improves the data-to-overhead ratio of both the
+guest-host link, and PCI bus. The expectation of the guest network stack in this
+scenario is that segmentation of egress frames will take place either in the NIC
+HW, or where that hardware capability is unavailable, either in the host
+application, or network stack.
+
+Bearing that in mind, the GSO library enables DPDK applications to segment
+packets in software. Note however, that GSO is implemented as a standalone
+library, and not via a 'fallback' mechanism (i.e. for when TSO is unsupported
+in the underlying hardware); that is, applications must explicitly invoke the
+GSO library to segment packets. The size of GSO segments ``(segsz)`` is
+configurable by the application.
+
+Limitations
+-----------
+
+#. The GSO library doesn't check if input packets have correct checksums.
+
+#. In addition, the GSO library doesn't re-calculate checksums for segmented
+   packets (that task is left to the application).
+
+#. IP fragments are unsupported by the GSO library.
+
+#. The egress interface's driver must support multi-segment packets.
+
+#. Currently, the GSO library supports the following IPv4 packet types:
+
+ - TCP
+ - VxLAN
+ - GRE
+
+  See `Supported GSO Packet Types`_ for further details.
+
+Packet Segmentation
+-------------------
+
+The ``rte_gso_segment()`` function is the GSO library's primary
+segmentation API.
+
+Before performing segmentation, an application must create a GSO context object
+``(struct rte_gso_ctx)``, which provides the library with some of the
+information required to understand how the packet should be segmented. Refer to
+`How to Segment a Packet`_ for additional details on same. Once the GSO context
+has been created, and populated, the application can then use the
+``rte_gso_segment()`` function to segment packets.
+
+The GSO library typically stores each segment that it creates in two parts: the
+first part contains a copy of the original packet's headers, while the second
+part contains a pointer to an offset within the original packet. This mechanism
+is explained in more detail in `GSO Output Segment Format`_.
+
+The GSO library supports both single- and multi-segment input mbufs.
+
+GSO Output Segment Format
+~~~~~~~~~~~~~~~~~~~~~~~~~
+To reduce the number of expensive memcpy operations required when segmenting a
+packet, the GSO library typically stores each segment that it creates as a
+two-part mbuf (technically, this is termed a 'two-segment' mbuf; however, since
+the elements produced by the API are also called 'segments', for clarity the
+term 'part' is used here instead).
+
+The first part of each output segment is a direct mbuf and contains a copy of
+the original packet's headers, which must be prepended to each output segment.
+These headers are copied from the original packet into each output segment.
+
+The second part of each output segment, represents a section of data from the
+original packet, i.e. a data segment. Rather than copy the data directly from
+the original packet into the output segment (which would impact performance
+considerably), the second part of each output segment is an indirect mbuf,
+which contains no actual data, but simply points to an offset within the
+original packet.
+
+The combination of the 'header' segment and the 'data' segment constitutes a
+single logical output GSO segment of the original packet. This is illustrated
+in :numref:`figure_gso-output-segment-format`.
+
+.. _figure_gso-output-segment-format:
+
+.. figure:: img/gso-output-segment-format.svg
+   :align: center
+
+   Two-part GSO output segment
+
+In one situation, the output segment may contain additional 'data' segments.
+This only occurs when:
+
+- the input packet on which GSO is to be performed is represented by a
+  multi-segment mbuf.
+
+- the output segment is required to contain data that spans the boundaries
+  between segments of the input multi-segment mbuf.
+
+The GSO library traverses each segment of the input packet, and produces
+numerous output segments; for optimal performance, the number of output
+segments is kept to a minimum. Consequently, the GSO library maximizes the
+amount of data contained within each output segment; i.e. each output segment
+``segsz`` bytes of data. The only exception to this is in the case of the very
+final output segment; if ``pkt_len`` % ``segsz``, then the final segment is
+smaller than the rest.
+
+In order for an output segment to meet its MSS, it may need to include data from
+multiple input segments. Due to the nature of indirect mbufs (each indirect mbuf
+can point to only one direct mbuf), the solution here is to add another indirect
+mbuf to the output segment; this additional segment then points to the next
+input segment. If necessary, this chaining process is repeated, until the sum of
+all of the data 'contained' in the output segment reaches ``segsz``. This
+ensures that the amount of data contained within each output segment is uniform,
+with the possible exception of the last segment, as previously described.
+
+:numref:`figure_gso-three-seg-mbuf` illustrates an example of a three-part
+output segment. In this example, the output segment needs to include data from
+the end of one input segment, and the beginning of another. To achieve this,
+an additional indirect mbuf is chained to the second part of the output segment,
+and is attached to the next input segment (i.e. it points to the data in the
+next input segment).
+
+.. _figure_gso-three-seg-mbuf:
+
+.. figure:: img/gso-three-seg-mbuf.svg
+   :align: center
+
+   Three-part GSO output segment
+
+Supported GSO Packet Types
+--------------------------
+
+TCP/IPv4 GSO
+~~~~~~~~~~~~
+TCP/IPv4 GSO supports segmentation of suitably large TCP/IPv4 packets, which
+may also contain an optional VLAN tag.
+
+VxLAN GSO
+~~~~~~~~~
+VxLAN packets GSO supports segmentation of suitably large VxLAN packets,
+which contain an outer IPv4 header, inner TCP/IPv4 headers, and optional
+inner and/or outer VLAN tag(s).
+
+GRE GSO
+~~~~~~~
+GRE GSO supports segmentation of suitably large GRE packets, which contain
+an outer IPv4 header, inner TCP/IPv4 headers, and an optional VLAN tag.
+
+How to Segment a Packet
+-----------------------
+
+To segment an outgoing packet, an application must:
+
+#. First create a GSO context ``(struct rte_gso_ctx)``; this contains:
+
+   - a pointer to the mbuf pool for allocating the direct buffers, which are
+     used to store the GSO segments' packet headers.
+
+   - a pointer to the mbuf pool for allocating indirect buffers, which are
+     used to locate GSO segments' packet payloads.
+
+.. note::
+
+     An application may use the same pool for both direct and indirect
+     buffers. However, since each indirect mbuf simply stores a pointer, the
+     application may reduce its memory consumption by creating a separate memory
+     pool, containing smaller elements, for the indirect pool.
+
+   - the size of each output segment, including packet headers and payload,
+     measured in bytes.
+
+   - the bit mask of required GSO types. The GSO library uses the same macros as
+     those that describe a physical device's TX offloading capabilities (i.e.
+     ``DEV_TX_OFFLOAD_*_TSO``) for gso_types. For example, if an application
+     wants to segment TCP/IPv4 packets, it should set gso_types to
+     ``DEV_TX_OFFLOAD_TCP_TSO``. The only other supported values currently
+     supported for gso_types are ``DEV_TX_OFFLOAD_VXLAN_TNL_TSO``, and
+     ``DEV_TX_OFFLOAD_GRE_TNL_TSO``; a combination of these macros is also
+     allowed.
+
+   - a flag, that indicates whether the IPv4 headers of output segments should
+     contain fixed or incremental ID values.
+
+2. Set the appropriate ol_flags in the mbuf.
+
+   - The GSO library use the value of an mbuf's ``ol_flags`` attribute to
+     to determine how a packet should be segmented. It is the application's
+     responsibility to ensure that these flags are set.
+
+   - For example, in order to segment TCP/IPv4 packets, the application should
+     add the ``PKT_TX_IPV4`` and ``PKT_TX_TCP_SEG`` flags to the mbuf's
+     ol_flags.
+
+   - If checksum calculation in hardware is required, the application should
+     also add the ``PKT_TX_TCP_CKSUM`` and ``PKT_TX_IP_CKSUM`` flags.
+
+#. Check if the packet should be processed. Packets with one of the
+   following properties are not processed and are returned immediately:
+
+   - Packet length is less than ``segsz`` (i.e. GSO is not required).
+
+   - Packet type is not supported by GSO library (see
+     `Supported GSO Packet Types`_).
+
+   - Application has not enabled GSO support for the packet type.
+
+   - Packet's ol_flags have been incorrectly set.
+
+#. Allocate space in which to store the output GSO segments. If the amount of
+   space allocated by the application is insufficient, segmentation will fail.
+
+#. Invoke the GSO segmentation API, ``rte_gso_segment()``.
+
+#. If required, update the L3 and L4 checksums of the newly-created segments.
+   For tunneled packets, the outer IPv4 headers' checksums should also be
+   updated. Alternatively, the application may offload checksum calculation
+   to HW.
+
diff --git a/doc/guides/prog_guide/img/gso-output-segment-format.svg b/doc/guides/prog_guide/img/gso-output-segment-format.svg
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+               </g>
+               <g id="shape4-3" v:mID="4" v:groupContext="shape" transform="translate(184.298,-201.906)">
+                       <title>Sheet.4</title>
+                       <path d="M94.04 570.43 L117.87 557.26 L0 344.58 L47.68 318.26 L165.55 530.94 L189.39 517.79 L168.08 591.69 L94.04 570.43
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+               </g>
+               <g id="shape5-5" v:mID="5" v:groupContext="shape" transform="translate(184.298,-201.906)">
+                       <title>Sheet.5</title>
+                       <path d="M94.04 570.43 L117.87 557.26 L0 344.58 L47.68 318.26 L165.55 530.94 L189.39 517.79 L168.08 591.69 L94.04 570.43"
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+               <g id="shape6-8" v:mID="6" v:groupContext="shape" transform="translate(119.408,-447.917)">
+                       <title>Sheet.6</title>
+                       <path d="M0 510.21 L0 591.69 L129.86 591.69 L129.86 510.21 L0 510.21 L0 510.21 Z" class="st4"/>
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+               <g id="shape7-10" v:mID="7" v:groupContext="shape" transform="translate(119.408,-447.917)">
+                       <title>Sheet.7</title>
+                       <path d="M0 510.21 L129.86 510.21 L129.86 591.69 L0 591.69 L0 510.21" class="st5"/>
+               </g>
+               <g id="shape10-13" v:mID="10" v:groupContext="shape" transform="translate(250.819,-447.917)">
+                       <title>Sheet.10</title>
+                       <path d="M0 510.21 L0 591.69 L822.53 591.69 L822.53 510.21 L0 510.21 L0 510.21 Z" class="st6"/>
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+               <g id="shape11-15" v:mID="11" v:groupContext="shape" transform="translate(250.819,-447.917)">
+                       <title>Sheet.11</title>
+                       <path d="M0 510.21 L822.53 510.21 L822.53 591.69 L0 591.69 L0 510.21" class="st7"/>
+               </g>
+               <g id="shape12-18" v:mID="12" v:groupContext="shape" transform="translate(255.478,-470.123)">
+                       <title>Sheet.12</title>
+                       <desc>Payload 0</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="157.315" cy="574.07" width="314.63" height="35.245"/>
+                       <path d="M314.63 556.45 L0 556.45 L0 591.69 L314.63 591.69 L314.63 556.45" class="st8"/>
+                       <text x="102.08" y="581.27" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 0</text>             </g>
+               <g id="shape13-22" v:mID="13" v:groupContext="shape" transform="translate(577.354,-470.123)">
+                       <title>Sheet.13</title>
+                       <desc>Payload 1</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="167.112" cy="574.07" width="334.23" height="35.245"/>
+                       <path d="M334.22 556.45 L0 556.45 L0 591.69 L334.22 591.69 L334.22 556.45" class="st8"/>
+                       <text x="111.88" y="581.27" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 1</text>             </g>
+               <g id="shape14-26" v:mID="14" v:groupContext="shape" transform="translate(910.635,-470.956)">
+                       <title>Sheet.14</title>
+                       <desc>Payload 2</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="81.8509" cy="574.07" width="163.71" height="35.245"/>
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+                       <text x="26.61" y="581.27" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 2</text>              </g>
+               <g id="shape15-30" v:mID="15" v:groupContext="shape" transform="translate(909.144,-453.824)">
+                       <title>Sheet.15</title>
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+               <g id="shape16-32" v:mID="16" v:groupContext="shape" transform="translate(119.187,-447.917)">
+                       <title>Sheet.16</title>
+                       <path d="M0 510.21 L0 591.69 L129.86 591.69 L129.86 510.21 L0 510.21 L0 510.21 Z" class="st4"/>
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+               <g id="shape17-34" v:mID="17" v:groupContext="shape" transform="translate(119.187,-447.917)">
+                       <title>Sheet.17</title>
+                       <path d="M0 510.21 L129.86 510.21 L129.86 591.69 L0 591.69 L0 510.21" class="st5"/>
+               </g>
+               <g id="shape18-37" v:mID="18" v:groupContext="shape" transform="translate(121.944,-471.034)">
+                       <title>Sheet.18</title>
+                       <desc>Header</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="61.0973" cy="574.07" width="122.2" height="35.245"/>
+                       <path d="M122.19 556.45 L0 556.45 L0 591.69 L122.19 591.69 L122.19 556.45" class="st8"/>
+                       <text x="20.61" y="581.27" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Header</text>         </g>
+               <g id="shape19-41" v:mID="19" v:groupContext="shape" transform="translate(329.798,-1.87868)">
+                       <title>Sheet.19</title>
+                       <path d="M0 510.43 L0 591.69 L289.81 591.69 L289.81 510.43 L0 510.43 L0 510.43 Z" class="st4"/>
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+               <g id="shape20-43" v:mID="20" v:groupContext="shape" transform="translate(329.798,-1.87868)">
+                       <title>Sheet.20</title>
+                       <path d="M0 510.43 L289.81 510.43 L289.81 591.69 L0 591.69 L0 510.43" class="st5"/>
+               </g>
+               <g id="shape21-46" v:mID="21" v:groupContext="shape" transform="translate(424.908,-21.567)">
+                       <title>Sheet.21</title>
+                       <desc>Header</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="61.0973" cy="574.07" width="122.2" height="35.245"/>
+                       <path d="M122.19 556.45 L0 556.45 L0 591.69 L122.19 591.69 L122.19 556.45" class="st8"/>
+                       <text x="11.55" y="582.88" class="st11" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Header</text>                </g>
+               <g id="shape22-50" v:mID="22" v:groupContext="shape" transform="translate(619.609,-1.87868)">
+                       <title>Sheet.22</title>
+                       <path d="M0 510.43 L0 591.69 L453.74 591.69 L453.74 510.43 L0 510.43 L0 510.43 Z" class="st6"/>
+               </g>
+               <g id="shape23-52" v:mID="23" v:groupContext="shape" transform="translate(619.609,-1.87868)">
+                       <title>Sheet.23</title>
+                       <path d="M0 510.43 L453.74 510.43 L453.74 591.69 L0 591.69 L0 510.43" class="st7"/>
+               </g>
+               <g id="shape24-55" v:mID="24" v:groupContext="shape" transform="translate(778.624,-21.5672)">
+                       <title>Sheet.24</title>
+                       <desc>Payload 1</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="81.8509" cy="574.07" width="163.71" height="35.245"/>
+                       <path d="M163.7 556.45 L0 556.45 L0 591.69 L163.7 591.69 L163.7 556.45" class="st8"/>
+                       <text x="14.26" y="582.88" class="st11" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 1</text>             </g>
+               <g id="shape25-59" v:mID="25" v:groupContext="shape" transform="translate(710.092,-113.83)">
+                       <title>Sheet.25</title>
+                       <path d="M0 522.69 C0 515.07 6.19 508.89 13.83 508.89 L349.43 508.89 C357.12 508.89 363.26 515.07 363.26 522.69 L363.26
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+               <g id="shape26-61" v:mID="26" v:groupContext="shape" transform="translate(710.092,-113.83)">
+                       <title>Sheet.26</title>
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+               </g>
+               <g id="shape27-63" v:mID="27" v:groupContext="shape" transform="translate(813.057,-150.108)">
+                       <title>Sheet.27</title>
+                       <desc>Indirect mbuf</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="94.1386" cy="576.19" width="188.28" height="31.0055"/>
+                       <path d="M188.28 560.69 L0 560.69 L0 591.69 L188.28 591.69 L188.28 560.69" class="st8"/>
+                       <text x="15.43" y="583.94" class="st13" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Indirect mbuf</text>         </g>
+               <g id="shape28-67" v:mID="28" v:groupContext="shape" transform="translate(810.845,-123.854)">
+                       <title>Sheet.28</title>
+                       <desc>(pointer to data)</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="95.5065" cy="578.442" width="191.02" height="26.501"/>
+                       <path d="M191.01 565.19 L0 565.19 L0 591.69 L191.01 591.69 L191.01 565.19" class="st8"/>
+                       <text x="15.15" y="585.07" class="st14" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>(pointer to data)</text>             </g>
+               <g id="shape29-71" v:mID="29" v:groupContext="shape" transform="translate(573.151,-149.601)">
+                       <title>Sheet.29</title>
+                       <path d="M0 584.74 L127.76 584.74 L127.76 587.61 L0 587.61 L0 584.74 L0 584.74 ZM125.91 580.65 L136.97 586.17 L125.91
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+               </g>
+               <g id="shape30-73" v:mID="30" v:groupContext="shape" transform="translate(0,-309.671)">
+                       <title>Sheet.30</title>
+                       <desc>Memory copy</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="108.076" cy="574.07" width="216.16" height="35.245"/>
+                       <path d="M216.15 556.45 L0 556.45 L0 591.69 L216.15 591.69 L216.15 556.45" class="st8"/>
+                       <text x="17.68" y="582.88" class="st16" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Memory copy</text>           </g>
+               <g id="shape31-77" v:mID="31" v:groupContext="shape" transform="translate(680.77,-305.707)">
+                       <title>Sheet.31</title>
+                       <desc>No Memory Copy</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="136.547" cy="574.07" width="273.1" height="35.245"/>
+                       <path d="M273.09 556.45 L0 556.45 L0 591.69 L273.09 591.69 L273.09 556.45" class="st8"/>
+                       <text x="21.4" y="582.88" class="st17" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>No Memory Copy</text>         </g>
+               <g id="shape32-81" v:mID="32" v:groupContext="shape" transform="translate(1102.72,-26.7532)">
+                       <title>Sheet.32</title>
+                       <desc>Logical output segment</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="138.243" cy="578.442" width="276.49" height="26.501"/>
+                       <path d="M276.49 565.19 L0 565.19 L0 591.69 L276.49 591.69 L276.49 565.19" class="st8"/>
+                       <text x="20.73" y="585.07" class="st14" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Logical output segment</text>                </g>
+               <g id="shape36-85" v:mID="36" v:groupContext="shape" transform="translate(1106.81,-138.647)">
+                       <title>Sheet.36</title>
+                       <desc>Two-part output segment</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="144.906" cy="578.442" width="289.82" height="26.501"/>
+                       <path d="M289.81 565.19 L0 565.19 L0 591.69 L289.81 591.69 L289.81 565.19" class="st8"/>
+                       <text x="16.56" y="585.07" class="st14" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Two-part output segment</text>               </g>
+               <g id="shape37-89" v:mID="37" v:groupContext="shape" transform="translate(575.916,-453.879)">
+                       <title>Sheet.37</title>
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index 0000000..f18a327
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+               <g id="shape6-9" v:mID="6" v:groupContext="shape" transform="translate(2.5012,-522.82)">
+                       <title>Sheet.6</title>
+                       <path d="M0 597.01 L0 694.06 L154.68 694.06 L154.68 597.01 L0 597.01 L0 597.01 Z" class="st4"/>
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+               <g id="shape7-11" v:mID="7" v:groupContext="shape" transform="translate(2.5012,-522.82)">
+                       <title>Sheet.7</title>
+                       <path d="M0 597.01 L154.68 597.01 L154.68 694.06 L0 694.06 L0 597.01" class="st5"/>
+               </g>
+               <g id="shape10-14" v:mID="10" v:groupContext="shape" transform="translate(159.025,-522.82)">
+                       <title>Sheet.10</title>
+                       <path d="M0 597.01 L0 694.06 L563.73 694.06 L563.73 597.01 L0 597.01 L0 597.01 Z" class="st6"/>
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+               <g id="shape11-16" v:mID="11" v:groupContext="shape" transform="translate(159.025,-522.82)">
+                       <title>Sheet.11</title>
+                       <path d="M0 597.01 L563.73 597.01 L563.73 694.06 L0 694.06 L0 597.01" class="st7"/>
+               </g>
+               <g id="shape12-19" v:mID="12" v:groupContext="shape" transform="translate(262.039,-549.269)">
+                       <title>Sheet.12</title>
+                       <desc>Payload 0</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="97.4929" cy="673.065" width="194.99" height="41.9798"/>
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+                       <text x="46.92" y="680.57" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 0</text>              </g>
+               <g id="shape13-23" v:mID="13" v:groupContext="shape" transform="translate(547.615,-549.269)">
+                       <title>Sheet.13</title>
+                       <desc>Payload 1</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="87.5716" cy="673.065" width="175.15" height="41.9798"/>
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+                       <text x="37" y="680.57" class="st9" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Payload 1</text>         </g>
+               <g id="shape15-27" v:mID="15" v:groupContext="shape" transform="translate(2.2377,-522.82)">
+                       <title>Sheet.15</title>
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+               <g id="shape16-29" v:mID="16" v:groupContext="shape" transform="translate(2.2377,-522.82)">
+                       <title>Sheet.16</title>
+                       <path d="M0 597.01 L154.68 597.01 L154.68 694.06 L0 694.06 L0 597.01" class="st5"/>
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+               <g id="shape17-32" v:mID="17" v:groupContext="shape" transform="translate(6.52106,-546.331)">
+                       <title>Sheet.17</title>
+                       <desc>Header</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="72.773" cy="673.065" width="145.55" height="41.9798"/>
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+                       <title>Sheet.23</title>
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+               <g id="shape24-38" v:mID="24" v:groupContext="shape" transform="translate(286.548,-2.2377)">
+                       <title>Sheet.24</title>
+                       <path d="M0 597.27 L345.2 597.27 L345.2 694.06 L0 694.06 L0 597.27" class="st5"/>
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+               <g id="shape25-41" v:mID="25" v:groupContext="shape" transform="translate(399.834,-25.6887)">
+                       <title>Sheet.25</title>
+                       <desc>Header</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="72.773" cy="673.065" width="145.55" height="41.9798"/>
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+               <g id="shape31-45" v:mID="31" v:groupContext="shape" transform="translate(631.744,-2.2377)">
+                       <title>Sheet.31</title>
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+               <g id="shape32-47" v:mID="32" v:groupContext="shape" transform="translate(631.744,-2.2377)">
+                       <title>Sheet.32</title>
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+               <g id="shape33-50" v:mID="33" v:groupContext="shape" transform="translate(809.035,-25.6889)">
+                       <title>Sheet.33</title>
+                       <desc>Payload 1</desc>
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+                       <title>Sheet.35</title>
+                       <desc>Logical output segment</desc>
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+               <g id="shape38-58" v:mID="38" v:groupContext="shape" transform="translate(1204.65,-254.446)">
+                       <title>Sheet.38</title>
+                       <desc>Three-part output segment</desc>
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+               <g id="shape39-62" v:mID="39" v:groupContext="shape" transform="translate(546.25,-529.921)">
+                       <title>Sheet.39</title>
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+               <g id="shape47-68" v:mID="47" v:groupContext="shape" transform="translate(66.8445,-221.499)">
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+               <g id="shape48-70" v:mID="48" v:groupContext="shape" transform="translate(113.27,-263.667)">
+                       <title>Sheet.48</title>
+                       <desc>Direct mbuf</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="98.5041" cy="675.59" width="197.01" height="36.9302"/>
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+                       <text x="18.66" y="684.59" class="st13" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Direct mbuf</text>           </g>
+               <g id="shape51-74" v:mID="51" v:groupContext="shape" transform="translate(85.817,-233.439)">
+                       <title>Sheet.51</title>
+                       <desc>(copy of headers)</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="127.916" cy="678.273" width="255.84" height="31.5648"/>
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+                       <text x="34.33" y="685.47" class="st14" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>(copy of headers)</text>             </g>
+               <g id="shape53-78" v:mID="53" v:groupContext="shape" transform="translate(371.944,-275.998)">
+                       <title>Sheet.53</title>
+                       <desc>next</desc>
+                       <v:textBlock v:margins="rect(0,0,0,0)" v:tabSpace="42.5197"/>
+                       <v:textRect cx="33.3635" cy="678.273" width="66.73" height="31.5648"/>
+                       <path d="M66.73 662.49 L0 662.49 L0 694.06 L66.73 694.06 L66.73 662.49" class="st8"/>
+                       <text x="7.56" y="686.16" class="st15" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>next</text>           </g>
+               <g id="shape54-82" v:mID="54" v:groupContext="shape" transform="translate(695.132,-646.04)">
+                       <title>Sheet.54</title>
+                       <path d="M0 655.39 L0 694.06 L100.4 694.06 L100.4 655.39 L0 655.39 L0 655.39 Z" class="st16"/>
+               </g>
+               <g id="shape55-84" v:mID="55" v:groupContext="shape" transform="translate(709.033,-648.946)">
+                       <title>Sheet.55</title>
+                       <desc>segsz</desc>
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+               <g id="shape56-88" v:mID="56" v:groupContext="shape" transform="translate(785.874,-521.182)">
+                       <title>Sheet.56</title>
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+               <g id="shape57-90" v:mID="57" v:groupContext="shape" transform="translate(785.874,-521.182)">
+                       <title>Sheet.57</title>
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+                       <title>Sheet.58</title>
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+                       <title>Sheet.60</title>
+                       <desc>Payload 2</desc>
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+                       <title>Sheet.63</title>
+                       <desc>Multi-segment input packet</desc>
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+                       <title>Sheet.70</title>
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+                       <desc>Indirect mbuf</desc>
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+                       <title>Sheet.75</title>
+                       <desc>(pointer to data)</desc>
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+               <g id="shape77-119" v:mID="77" v:groupContext="shape" transform="translate(717.742,-563.523)">
+                       <title>Sheet.77</title>
+                       <desc>next</desc>
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+                       <v:textRect cx="33.3635" cy="678.273" width="66.73" height="31.5648"/>
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+               <g id="shape78-123" v:mID="78" v:groupContext="shape" transform="translate(1148.17,-529.067)">
+                       <title>Sheet.78</title>
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+                       <title>Sheet.82</title>
+                       <desc>% segsz</desc>
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+                       <title>Sheet.34</title>
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+                       <title>Sheet.95</title>
+                       <desc>next</desc>
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+                       <desc>Indirect mbuf</desc>
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+               <g id="shape106-165" v:mID="106" v:groupContext="shape" v:layerMember="0" transform="translate(895.672,-229.419)">
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+               <g id="shape107-169" v:mID="107" v:groupContext="shape" v:layerMember="0" transform="translate(863.297,-280.442)">
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+                       <desc>3</desc>
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+</svg>
index 7ff5144..b5ad6b8 100644 (file)
@@ -57,6 +57,7 @@ Programmer's Guide
     reorder_lib
     ip_fragment_reassembly_lib
     generic_receive_offload_lib
+    generic_segmentation_offload_lib
     pdump_lib
     multi_proc_support
     kernel_nic_interface