Merge tag 'mailbox-v4.20' of git://git.linaro.org/landing-teams/working/fujitsu/integ...

[sfrench/cifs-2.6.git] / Documentation / ABI / testing / sysfs-class-net

diff --git a/Documentation/ABI/testing/sysfs-class-net b/Documentation/ABI/testing/sysfs-class-net
index e2e0fe553ad80ffd8d643cf24198a0bc604b1240..664a8f6a634f3588e769f4e72cc764f66d9c5f1e 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-net
+++ b/Documentation/ABI/testing/sysfs-class-net
@@ -91,6 +91,24 @@ Description:
                stacked (e.g: VLAN interfaces) but still have the same MAC
                address as their parent device.
 
+What:          /sys/class/net/<iface>/dev_port
+Date:          February 2014
+KernelVersion: 3.15
+Contact:       netdev@vger.kernel.org
+Description:
+               Indicates the port number of this network device, formatted
+               as a decimal value. Some NICs have multiple independent ports
+               on the same PCI bus, device and function. This attribute allows
+               userspace to distinguish the respective interfaces.
+
+               Note: some device drivers started to use 'dev_id' for this
+               purpose since long before 3.15 and have not adopted the new
+               attribute ever since. To query the port number, some tools look
+               exclusively at 'dev_port', while others only consult 'dev_id'.
+               If a network device has multiple client adapter ports as
+               described in the previous paragraph and does not set this
+               attribute to its port number, it's a kernel bug.
+
 What:          /sys/class/net/<iface>/dormant
 Date:          March 2006
 KernelVersion: 2.6.17