Wiki code for DL_NOTE_LINK_{UP,DOWN}

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1: Device driver support for the {{code}}DL_NOTE_LINK_UP{{/code}} and {{code}}DL_NOTE_LINK_DOWN{{/code}} notification messages is required by the NWAM prototype in order to automatically detect plugging/unplugging of an ethernet cable. This requirement only affects ethernet drivers. The following sections provide more information about individual driver support of these notifications.
2: 
3: ===== [[Drivers that support the notifications>>#supported]] =====
4: 
5: ===== [[Drivers that do not support the notifications>>#unsupported]] =====
6: 
7: ===== [[How to determine if your driver supports them>>#howtocheck]] =====
8: 
9: ===== [[What to do if your driver does not support them>>#workaround]] =====
10: 
11: ==== Drivers that support the notifications ====
12: 
13:  We have confirmed that the bge, e1000g and eri drivers support these notifications.
14: 
15:  Other drivers which are believed (based on code inspection) to support this are:
16: 
17: * ce
18: * chxge
19: * dmfe
20: * gem
21: * hme
22: * ibd
23: * ipge
24: * ixgb
25: * ixge
26: * nge
27: * nxge
28: * qfe
29: * rge
30: * rtls
31: * xge
32: 
33: ==== Drivers that do not support the notifications ====
34: 
35:  The following drivers do not appear to support these notifications:
36: 
37: * bcme
38: * elxl
39: * ge
40: * iprb
41: * pcelx
42: * skge
43: 
44: ==== How to determine if your driver supports them ====
45: 
46:  A simple way to determine if your driver does or does not support this feature is by checking the {{code}}IFF_RUNNING{{/code}} flag in the {{code}}ifconfig{{/code}} output. When the cable is plugged in, the {{code}}IFF_RUNNING{{/code}} flag should be set, i.e. {{code}}RUNNING{{/code}} should appear in the {{code}}ifconfig{{/code}} output:
47: 
48: {{{bge0: flags=1000843&#x3c;UP,BROADCAST,RUNNING,MULTICAST,IPv4&#x3e; mtu 1500 index 2}}}
49: 
50:  When you unplug the cable, the {{code}}IFF_RUNNING{{/code}} flag should be cleared within a couple seconds, thus the word {{code}}RUNNING{{/code}} will not appear in the {{code}}ifconfig{{/code}} output:
51: 
52: {{{bge0: flags=1000803&#x3c;UP,BROADCAST,MULTICAST,IPv4&#x3e; mtu 1500 index 2}}}
53: 
54: ==== What to do if your driver does not support them ====
55: 
56:  These notifications are the signal to the nwam daemon that an ethernet interface has become available (the cable has been plugged in) or is no longer available (the cable has been unplugged). Therefore, if the driver does not send them, the nwam daemon cannot automatically react to these changes; instead, it believes that the ethernet interface is always available, and will never switch to an alternate interface.
57: 
58:  To force another interface to be used, you can change the order in which nwam attempts to bring up interfaces by editing {{code}}/etc/nwam/llp{{/code}}. This file contains one line for each interface in the system; on a laptop with one ethernet interface, bge0, and one wireless interface, ath0, that file will look like
59: 
60: {{{
61: bge0   dhcp
62: ath0   dhcp
63: 
64: }}}
65: 
66:  The order of the entries matters; by default, wired interfaces will be listed first, as they are preferred over wireless. If you change the order, so that, for example, ath0 appears before bge0, that wireless interface will be preferred and thus configured first.
67: 
68:  After editing {{code}}/etc/nwam/llp{{/code}}, you will need to restart the nwam service to force a reload of the file contents.
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