[ovs-dev] [PATCH v2] userspace-tso: Document the minimum kernel version.

Flavio Leitner fbl at sysclose.org
Tue Mar 10 14:39:36 UTC 2020

The kernel needs to be at least 4.19-rc7 to include the commit
9d2f67e43b73 ("net/packet: fix packet drop as of virtio gso")
otherwise the TSO packets are dropped when using raw sockets.

Fixes: 29cf9c1b3b9c ("userspace: Add TCP Segmentation Offload support")
Reported-by: Yi Yang (杨燚)-云服务集团 <yangyi01 at inspur.com>
Signed-off-by: Flavio Leitner <fbl at sysclose.org>
 Documentation/topics/userspace-tso.rst | 6 ++++++
 1 file changed, 6 insertions(+)

  - Change wording to be more clear with regards to kernel
    versions and possible backports.

diff --git a/Documentation/topics/userspace-tso.rst b/Documentation/topics/userspace-tso.rst
index 0fbac93a5..65655c0c2 100644
--- a/Documentation/topics/userspace-tso.rst
+++ b/Documentation/topics/userspace-tso.rst
@@ -113,6 +113,12 @@ __ https://patches.dpdk.org/patch/64136/
 This fix is expected to be included in the 19.11.1 release. When OVS migrates
 to this DPDK release, this limitation can be removed.
+All kernel devices that use the raw socket interface (veth, for example)
+require the kernel commit 9d2f67e43b73 ("net/packet: fix packet drop
+as of virtio gso") in order to work properly. This commit was merged
+in upstream kernel 4.19-rc7, so make sure your kernel is either
+newer or contains the backport.
 Performance Tuning

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