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[ovs-dev,V3,4/4] Update Documentation/topics/userspace-tso.rst

Message ID 20200807105648.94860-5-yang_y_yi@163.com
State Changes Requested
Headers show
Series userspace: enable VXLAN TSO, GSO and GRO | expand

Commit Message

yang_y_yi Aug. 7, 2020, 10:56 a.m. UTC 
From: Yi Yang <yangyi01@inspur.com>

With GSO and GRO enabled, OVS DPDK can do GSO by software
if NIC can't support TSO or VXLAN TSO hardware offload.

Signed-off-by: Yi Yang <yangyi01@inspur.com>
---
 Documentation/topics/userspace-tso.rst | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)
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Patch

diff --git a/Documentation/topics/userspace-tso.rst b/Documentation/topics/userspace-tso.rst
index aafa4a1..3a255cd 100644
--- a/Documentation/topics/userspace-tso.rst
+++ b/Documentation/topics/userspace-tso.rst
@@ -87,8 +87,8 @@  used to enable same::
 Limitations
 ~~~~~~~~~~~
 
-The current OvS userspace `TSO` implementation supports flat and VLAN networks
-only (i.e. no support for `TSO` over tunneled connection [VxLAN, GRE, IPinIP,
+The current OvS userspace `TSO` implementation supports flat, VLAN and VXLAN
+networks only (i.e. no support for `TSO` over tunneled connection [GRE, IPinIP,
 etc.]).
 
 The NIC driver must support and advertise checksum offload for TCP and UDP.
@@ -98,11 +98,10 @@  in Open vSwitch. Currently, if the NIC supports that, then the feature is
 enabled, otherwise TSO can still be enabled but SCTP packets sent to the NIC
 will be dropped.
 
-There is no software implementation of TSO, so all ports attached to the
-datapath must support TSO or packets using that feature will be dropped
-on ports without TSO support.  That also means guests using vhost-user
-in client mode will receive TSO packet regardless of TSO being enabled
-or disabled within the guest.
+There is software implementation of TSO, which is called as GSO (Generic
+Segment Offload), so all ports attached to the datapath mustn't support TSO.
+That also means guests using vhost-user in client mode can receive TSO packet
+regardless of TSO being enabled or disabled within the guest.
 
 ~~~~~~~~~~~~~~~~~~
 Performance Tuning