[PATCH net-next 6/7] netdevsim: Simulate port function set state for a PCI port

Simulate port function state of a PCI port.
This enables users to get and set the state of the PCI port function.

Example of a PCI SF port which supports a port function:

Create a device with ID=10 and one physical port.
$ echo "10 1" > /sys/bus/netdevsim/new_device

Add PCI PF port:
$ devlink port add netdevsim/netdevsim10 flavour pcipf pfnum 2
netdevsim/netdevsim10/1: type eth netdev eth1 flavour pcipf controller 0 pfnum 2 external false splittable false
  function:
    hw_addr 00:00:00:00:00:00

$ devlink port add netdevsim/netdevsim10 flavour pcisf pfnum 2
netdevsim/netdevsim10/2: type eth netdev eth2 flavour pcisf controller 0 pfnum 2 sfnum 0 splittable false
  function:
    hw_addr 00:00:00:00:00:00

Show devlink port:
$ devlink port show netdevsim/netdevsim10/2
netdevsim/netdevsim10/2: type eth netdev eth2 flavour pcisf controller 0 pfnum 2 sfnum 0 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached

Set the MAC address and activate the function:
$ devlink port function set netdevsim/netdevsim10/2 hw_addr 00:11:22:33:44:55 state active

Show the port and function attributes in JSON format:
$ devlink port show netdevsim/netdevsim10/2 -jp
{
    "port": {
        "netdevsim/netdevsim10/2": {
            "type": "eth",
            "netdev": "eth2",
            "flavour": "pcisf",
            "controller": 0,
            "pfnum": 2,
            "sfnum": 0,
            "splittable": false,
            "function": {
                "hw_addr": "00:11:22:33:44:55",
                "state": "active",
                "opstate": "attached"
            }
        }
    }
}

Signed-off-by: Parav Pandit <redacted>
---
 drivers/net/netdevsim/dev.c           |  1 +
 drivers/net/netdevsim/netdevsim.h     |  4 ++++
 drivers/net/netdevsim/port_function.c | 15 +++++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 9f2164ea89cd..e8b6bd22fb1f 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c

@@ -910,6 +910,7 @@ static const struct devlink_ops nsim_dev_devlink_ops = {
 	.port_function_hw_addr_get = nsim_dev_port_fn_hw_addr_get,
 	.port_function_hw_addr_set = nsim_dev_port_fn_hw_addr_set,
 	.port_fn_state_get = nsim_dev_port_fn_state_get,
+	.port_fn_state_set = nsim_dev_port_fn_state_set,
 };
 
 #define NSIM_DEV_MAX_MACS_DEFAULT 32

diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index c0544d93e1e8..93bfa3e946b2 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h

@@ -333,3 +333,7 @@ int nsim_dev_port_fn_state_get(struct devlink *devlink,
 			       enum devlink_port_fn_state *state,
 			       enum devlink_port_fn_opstate *opstate,
 			       struct netlink_ext_ack *extack);
+int nsim_dev_port_fn_state_set(struct devlink *devlink,
+			       struct devlink_port *port,
+			       enum devlink_port_fn_state state,
+			       struct netlink_ext_ack *extack);

diff --git a/drivers/net/netdevsim/port_function.c b/drivers/net/netdevsim/port_function.c
index 10c692b8aea2..8e8e7d6df8a1 100644
--- a/drivers/net/netdevsim/port_function.c
+++ b/drivers/net/netdevsim/port_function.c

@@ -504,3 +504,18 @@ int nsim_dev_port_fn_state_get(struct devlink *devlink,
 		*opstate = DEVLINK_PORT_FN_OPSTATE_ATTACHED;
 	return 0;
 }
+
+int nsim_dev_port_fn_state_set(struct devlink *devlink,
+			       struct devlink_port *dl_port,
+			       enum devlink_port_fn_state state,
+			       struct netlink_ext_ack *extack)
+{
+	struct nsim_dev *nsim_dev = devlink_priv(devlink);
+	struct nsim_port_fn *port;
+
+	port = nsim_dev_to_port_fn(nsim_dev, dl_port, extack);
+	if (IS_ERR(port))
+		return PTR_ERR(port);
+	port->state = state;
+	return 0;
+}

-- 
2.26.2