7 .TH ovs\-vlan\-bug\-workaround 8 "February 2011" "Open vSwitch" "Open vSwitch Manual"
8 .ds PN ovs\-vlan\-bug\-workaround
11 ovs\-vlan\-bug\-workaround \- utility for configuring Linux VLAN driver bug workaround
14 \fBovs\-vlan\-bug\-workaround \fInetdev\fR \fBon\fR
16 \fBovs\-vlan\-bug\-workaround \fInetdev\fR \fBoff\fR
18 \fBovs\-vlan\-bug\-workaround \-\-help
20 \fBovs\-vlan\-bug\-workaround \-\-version
24 Some Linux network drivers support a feature called ``VLAN
25 acceleration''. VLAN acceleration is associated with a data structure
26 called a \fBvlan_group\fR that is, abstractly, a dictionary that maps
27 from a VLAN ID (in the range 0 to 4095) to a VLAN device, that is, a
28 Linux network device associated with a particular VLAN,
29 e.g. \fBeth0.9\fR for VLAN 9 on \fBeth0\fR.
31 Some drivers that support VLAN acceleration have bugs that fall
32 roughly into the categories listed below. \fBovs\-vlan\-test\fR(8)
33 can test for these driver bugs.
34 .so utilities/ovs-vlan-bugs.man
37 The correct long term solution is to fix these driver bugs.
39 For now, \fBovs\-vlan\-bug\-workaround\fR can enable a special-purpose
40 workaround for devices with buggy VLAN acceleration. A kernel patch
41 must be applied for this workaround to work.
43 Use the command \fBovs\-vlan\-bug\-workaround \fInetdev\fR \fBon\fR to
44 enable the VLAN driver bug workaround for network device \fInetdev\fR.
45 Use the command \fBovs\-vlan\-bug\-workaround \fInetdev\fR \fBoff\fR to
46 disable the VLAN driver bug workaround for network device \fInetdev\fR.
49 The following drivers in Linux version
50 2.6.32.12-0.7.1.xs1.0.0.311.170586 implement VLAN acceleration and are
51 relevant to Open vSwitch on XenServer. We have not tested any version
52 of most of these drivers, so we do not know whether they have a VLAN
53 problem that needs to be fixed. The drivers are listed by the name
54 that they report in, e.g., \fBethtool \-i\fR output; in a few cases
55 this differs slightly from the name of the module's \fB.ko\fR file:
59 \fB8139cp acenic amd8111e atl1c ATL1E atl1
60 atl2 be2net bna bnx2 bnx2x cnic
61 cxgb cxgb3 e1000 e1000e enic forcedeth
62 igb igbvf ixgb ixgbe jme ml4x_core
63 ns83820 qlge r8169 S2IO sky2 starfire
64 tehuti tg3 typhoon via-velocity vxge
67 The following drivers use \fBvlan_group\fR but are irrelevant to Open
70 Not used with Open vSwitch on XenServer.
72 Not shipped with XenServer. A FreeScale CPU-integrated device.
74 Cannot be built on x86. IBM Power architecture only.
76 Cannot be built on x86. SH4 architecture only.
78 Not shipped with XenServer. For use inside VMware VMs only.
90 .BR ovs\-vlan\-test (8).