[ovs.git] / utilities / ovs-vlan-bugs.man

.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.
Commit	Line	Data
431488e6 BP	1	.IP \(bu
	2	When NICs use VLAN stripping on receive they must pass a pointer to a
	3	\fBvlan_group\fR when reporting the stripped tag to the networking
	4	core. If no \fBvlan_group\fR is in use then some drivers just drop
	5	the extracted tag. Drivers are supposed to only enable stripping if a
	6	\fBvlan_group\fR is registered but not all of them do that.
	7	.
	8	.IP \(bu
e028de5b BP	9	On receive, some drivers handle priority tagged packets specially and
	10	don't pass the tag onto the network stack at all, so Open vSwitch
	11	never has a chance to see it.
	12	.
	13	.IP \(bu
431488e6 BP	14	Some drivers size their receive buffers based on whether a
	15	\fBvlan_group\fR is enabled, meaning that a maximum size packet with a
	16	VLAN tag will not fit if no \fBvlan_group\fR is configured.
	17	.
	18	.IP \(bu
	19	On transmit, some drivers expect that VLAN acceleration will be used
	20	if it is available, which can only be done if a \fBvlan_group\fR is
	21	configured. In these cases, the driver may fail to parse the packet
	22	and correctly setup checksum offloading or TSO.