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-rw-r--r--doc/guides/testpmd_app_ug/testpmd_funcs.rst7
1 files changed, 7 insertions, 0 deletions
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 <port_id>
+ 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
~~~~~~~~~~~~~