net: devlink: Add unused port flavour

Not all ports of a switch need to be used, particularly in embedded
systems. Add a port flavour for ports which physically exist in the
switch, but are not connected to the front panel etc, and so are
unused. By having unused ports present in devlink, it gives a more
accurate representation of the hardware. It also allows regions to be
associated to such ports, so allowing, for example, to determine
unused ports are correctly powered off, or to compare probable reset
defaults of unused ports to used ports experiences issues.

Actually registering unused ports and setting the flavour to unused is
optional. The DSA core will register all such switch ports, but such
ports are expected to be limited in number. Bigger ASICs may decide
not to list unused ports.

v2:
Expand the description about why it is useful

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Tested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This commit is contained in:

Andrew Lunn

2020-10-04 18:12:51 +02:00

committed by

David S. Miller

parent 321e921daa

commit cf1166349c

2 changed files with 6 additions and 1 deletions

									
										include/uapi/linux/devlink.h
									
		+3
		
												View File
												
				@@ -197,6 +197,9 @@ enum devlink_port_flavour {

								      * port that faces the PCI VF.

								      */

					DEVLINK_PORT_FLAVOUR_VIRTUAL, /* Any virtual port facing the user. */

					DEVLINK_PORT_FLAVOUR_UNUSED, /* Port which exists in the switch, but

								      * is not used in any way.

								      */

				};

				enum devlink_param_cmode {