X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fprog_guide%2Fgeneric_segmentation_offload_lib.rst;h=205cb8a866dc548a26db64c0c85d273894d16b3a;hb=cacf8267cc14e84384dbc86f24f6b10e8aedbcbc;hp=9959f0d29c998eb06286bbbcf3c3f5179e60cb7c;hpb=5630257fcc30397e7217139ec55da4f301f59fb7;p=dpdk.git

diff --git a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst
index 9959f0d29c..205cb8a866 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,
@@ -196,7 +206,7 @@ To segment an outgoing packet, an application must:
 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
+     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
@@ -227,4 +237,3 @@ To segment an outgoing packet, an application must:
    For tunneled packets, the outer IPv4 headers' checksums should also be
    updated. Alternatively, the application may offload checksum calculation
    to HW.
-