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-rw-r--r--Documentation/networking/operstates.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/networking/operstates.txt b/Documentation/networking/operstates.txt
index 1a77a3cfae54..97694572338b 100644
--- a/Documentation/networking/operstates.txt
+++ b/Documentation/networking/operstates.txt
@@ -88,6 +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, there is possible to set this bit from userpsace.
+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: