[PATCH iproute2-next 4/5] devlink: Support get port function state

[Parav Pandit <parav@nvidia.com>]

Print port function state and operational state whenever reported by
kernel.

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

$ devlink dev eswitch set pci/0000:06:00.0 mode switchdev

$ devlink port show
pci/0000:06:00.0/65535: type eth netdev ens2f0np0 flavour physical port 0 splittable false

$ devlink port add pci/0000:06:00.0 flavour pcisf pfnum 0 sfnum 88
pci/0000:08:00.0/32768: type eth netdev eth6 flavour pcisf controller 0 pfnum 0 sfnum 88 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached

$ devlink port show pci/0000:06:00.0/32768
pci/0000:06:00.0/32768: type eth netdev ens2f0npf0sf88 flavour pcisf controller 0 pfnum 0 sfnum 88 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached

$ devlink port function set pci/0000:06:00.0/32768 hw_addr 00:00:00:00:88:88

$ devlink port show pci/0000:06:00.0/32768 -jp
{
    "port": {
        "pci/0000:06:00.0/32768": {
            "type": "eth",
            "netdev": "ens2f0npf0sf88",
            "flavour": "pcisf",
            "controller": 0,
            "pfnum": 0,
            "sfnum": 88,
            "splittable": false,
            "function": {
                "hw_addr": "00:00:00:00:88:88",
                "state": "inactive",
                "opstate": "detached"
            }
        }
    }
}

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
 devlink/devlink.c | 55 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 47 insertions(+), 8 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 515dadc8..85b9bce9 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -3833,6 +3833,30 @@ static void pr_out_port_pfvfsf_num(struct dl *dl, struct nlattr **tb)
 	}
 }
 
+static const char *port_function_state(uint8_t state)
+{
+	switch (state) {
+	case DEVLINK_PORT_FN_STATE_INACTIVE:
+		return "inactive";
+	case DEVLINK_PORT_FN_STATE_ACTIVE:
+		return "active";
+	default:
+		return "unknown";
+	}
+}
+
+static const char *port_function_opstate(uint8_t state)
+{
+	switch (state) {
+	case DEVLINK_PORT_FN_OPSTATE_DETACHED:
+		return "detached";
+	case DEVLINK_PORT_FN_OPSTATE_ATTACHED:
+		return "attached";
+	default:
+		return "unknown";
+	}
+}
+
 static void pr_out_port_function(struct dl *dl, struct nlattr **tb_port)
 {
 	struct nlattr *tb[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {};
@@ -3849,16 +3873,31 @@ static void pr_out_port_function(struct dl *dl, struct nlattr **tb_port)
 	if (err != MNL_CB_OK)
 		return;
 
-	if (!tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR])
-		return;
-
-	len = mnl_attr_get_payload_len(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
-	data = mnl_attr_get_payload(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
-
 	pr_out_object_start(dl, "function");
 	check_indent_newline(dl);
-	print_string(PRINT_ANY, "hw_addr", "hw_addr %s",
-		     ll_addr_n2a(data, len, 0, hw_addr, sizeof(hw_addr)));
+
+	if (tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]) {
+		len = mnl_attr_get_payload_len(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
+		data = mnl_attr_get_payload(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
+
+		print_string(PRINT_ANY, "hw_addr", "hw_addr %s",
+			     ll_addr_n2a(data, len, 0, hw_addr, sizeof(hw_addr)));
+	}
+	if (tb[DEVLINK_PORT_FN_ATTR_STATE]) {
+		uint8_t state;
+
+		state = mnl_attr_get_u8(tb[DEVLINK_PORT_FN_ATTR_STATE]);
+
+		print_string(PRINT_ANY, "state", " state %s", port_function_state(state));
+	}
+	if (tb[DEVLINK_PORT_FN_ATTR_OPSTATE]) {
+		uint8_t state;
+
+		state = mnl_attr_get_u8(tb[DEVLINK_PORT_FN_ATTR_OPSTATE]);
+
+		print_string(PRINT_ANY, "opstate", " opstate %s", port_function_opstate(state));
+	}
+
 	if (!dl->json_output)
 		__pr_out_indent_dec();
 	pr_out_object_end(dl);
-- 
2.26.2