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https://github.com/openvswitch/ovs
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23 lines
988 B
Groff
23 lines
988 B
Groff
.IP \(bu
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When NICs use VLAN stripping on receive they must pass a pointer to a
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\fBvlan_group\fR when reporting the stripped tag to the networking
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core. If no \fBvlan_group\fR is in use then some drivers just drop
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the extracted tag. Drivers are supposed to only enable stripping if a
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\fBvlan_group\fR is registered but not all of them do that.
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.
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.IP \(bu
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On receive, some drivers handle priority tagged packets specially and
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don't pass the tag onto the network stack at all, so Open vSwitch
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never has a chance to see it.
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.
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.IP \(bu
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Some drivers size their receive buffers based on whether a
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\fBvlan_group\fR is enabled, meaning that a maximum size packet with a
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VLAN tag will not fit if no \fBvlan_group\fR is configured.
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.
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.IP \(bu
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On transmit, some drivers expect that VLAN acceleration will be used
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if it is available, which can only be done if a \fBvlan_group\fR is
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configured. In these cases, the driver may fail to parse the packet
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and correctly setup checksum offloading or TSO.
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