blob: 1e62d16ef05e8c8644f8c20d7a6047ce0d6a8137 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
.IP \(bu
When NICs use VLAN stripping on receive they must pass a pointer to a
\fBvlan_group\fR when reporting the stripped tag to the networking
core. If no \fBvlan_group\fR is in use then some drivers just drop
the extracted tag. Drivers are supposed to only enable stripping if a
\fBvlan_group\fR is registered but not all of them do that.
.
.IP \(bu
On receive, some drivers handle priority tagged packets specially and
don't pass the tag onto the network stack at all, so Open vSwitch
never has a chance to see it.
.
.IP \(bu
Some drivers size their receive buffers based on whether a
\fBvlan_group\fR is enabled, meaning that a maximum size packet with a
VLAN tag will not fit if no \fBvlan_group\fR is configured.
.
.IP \(bu
On transmit, some drivers expect that VLAN acceleration will be used
if it is available, which can only be done if a \fBvlan_group\fR is
configured. In these cases, the driver may fail to parse the packet
and correctly setup checksum offloading or TSO.
|
