diff options
| author | Willem de Bruijn <willemb@google.com> | 2023-03-02 10:48:08 -0500 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2023-03-06 14:33:58 +0100 |
| commit | 3360dceb59e09bd77259d4b30db9b0c3bfe91309 (patch) | |
| tree | 60fc8ff01bc8205916792c3d26cfa4da230ed7db | |
| parent | 806eabd74910447f21005160e90957bde4db0183 (diff) | |
| download | man-pages-3360dceb59e09bd77259d4b30db9b0c3bfe91309.tar.gz | |
udp.7: add UDP_GRO
UDP_GRO was added in commit e20cf8d3f1f7
("udp: implement GRO for plain UDP sockets.")
$ git describe --contains e20cf8d3f1f7
linux/v5.0-rc1~129^2~379^2~8
Kernel source has example code in tools/testing/selftests/net/udpgro*
Per https://www.kernel.org/doc/man-pages/patches.html,
"Describe how you obtained the information in your patch":
I reviewed the relevant UDP_GRO patches.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Cc: <pabeni@redhat.com>
Cc: <netdev@vger.kernel.org>
[ alx: srcfix ]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
| -rw-r--r-- | man7/udp.7 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/man7/udp.7 b/man7/udp.7 index 79fe130fbd..a9fdfbac9c 100644 --- a/man7/udp.7 +++ b/man7/udp.7 @@ -233,6 +233,20 @@ calls by passing it as a .BR cmsg (7). A value of zero disables the feature. This option should not be used in code intended to be portable. +.TP +.BR UDP_GRO " (since Linux 5.0)" +Enables UDP receive offload. +If enabled, +the socket may receive multiple datagrams worth of data +as a single large buffer, +together with a +.BR cmsg (7) +that holds the segment size. +This option is the inverse of segmentation offload. +It reduces receive cost by handling multiple datagrams worth of data +as a single large packet in the kernel receive path, +even when that exceeds MTU. +This option should not be used in code intended to be portable. .SS Ioctls These ioctls can be accessed using .BR ioctl (2). |