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Diffstat (limited to 'Documentation/networking/operstates.txt')
| -rw-r--r-- | Documentation/networking/operstates.txt | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/networking/operstates.txt b/Documentation/networking/operstates.txt index 4a21d9bb836..355c6d8ef8a 100644 --- a/Documentation/networking/operstates.txt +++ b/Documentation/networking/operstates.txt @@ -2,7 +2,7 @@ 1. Introduction Linux distinguishes between administrative and operational state of an -interface. Admininstrative state is the result of "ip link set dev +interface. Administrative state is the result of "ip link set dev <dev> up or down" and reflects whether the administrator wants to use the device for traffic. @@ -38,9 +38,6 @@ ifinfomsg::if_flags & IFF_LOWER_UP: ifinfomsg::if_flags & IFF_DORMANT: Driver has signaled netif_dormant_on() -These interface flags can also be queried without netlink using the -SIOCGIFFLAGS ioctl. - TLV IFLA_OPERSTATE contains RFC2863 state of the interface in numeric representation: @@ -91,6 +88,10 @@ set this flag. On netif_carrier_off(), the scheduler stops sending packets. The name 'carrier' and the inversion are historical, think of it as lower layer. +Note that for certain kind of soft-devices, which are not managing any +real hardware, it is possible to set this bit from userspace. One +should use TVL IFLA_CARRIER to do so. + netif_carrier_ok() can be used to query that bit. __LINK_STATE_DORMANT, maps to IFF_DORMANT: |