devlink: Add support for u64 parameters

Only 8, 16 and 32-bit integers are supported for numeric devlink
parameters. The subsequent patch adds support for DPLL clock ID
that is defined as 64-bit number. Add support for u64 parameter
type.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20250704182202.1641943-4-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: ivecera

include/net/devlink.h

@@ -425,6 +425,7 @@ enum devlink_param_type {
 	DEVLINK_PARAM_TYPE_U8 = DEVLINK_VAR_ATTR_TYPE_U8,
 	DEVLINK_PARAM_TYPE_U16 = DEVLINK_VAR_ATTR_TYPE_U16,
 	DEVLINK_PARAM_TYPE_U32 = DEVLINK_VAR_ATTR_TYPE_U32,
+	DEVLINK_PARAM_TYPE_U64 = DEVLINK_VAR_ATTR_TYPE_U64,
 	DEVLINK_PARAM_TYPE_STRING = DEVLINK_VAR_ATTR_TYPE_STRING,
 	DEVLINK_PARAM_TYPE_BOOL = DEVLINK_VAR_ATTR_TYPE_FLAG,
 };
@@ -433,6 +434,7 @@ union devlink_param_value {
 	u8 vu8;
 	u16 vu16;
 	u32 vu32;
+	u64 vu64;
 	char vstr[__DEVLINK_PARAM_MAX_STRING_VALUE];
 	bool vbool;
 };

net/devlink/param.c

@@ -200,6 +200,11 @@ devlink_nl_param_value_fill_one(struct sk_buff *msg,
 		if (nla_put_u32(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu32))
 			goto value_nest_cancel;
 		break;
+	case DEVLINK_PARAM_TYPE_U64:
+		if (devlink_nl_put_u64(msg, DEVLINK_ATTR_PARAM_VALUE_DATA,
+				       val.vu64))
+			goto value_nest_cancel;
+		break;
 	case DEVLINK_PARAM_TYPE_STRING:
 		if (nla_put_string(msg, DEVLINK_ATTR_PARAM_VALUE_DATA,
 				   val.vstr))
@@ -434,6 +439,11 @@ devlink_param_value_get_from_info(const struct devlink_param *param,
 			return -EINVAL;
 		value->vu32 = nla_get_u32(param_data);
 		break;
+	case DEVLINK_PARAM_TYPE_U64:
+		if (nla_len(param_data) != sizeof(u64))
+			return -EINVAL;
+		value->vu64 = nla_get_u64(param_data);
+		break;
 	case DEVLINK_PARAM_TYPE_STRING:
 		len = strnlen(nla_data(param_data), nla_len(param_data));
 		if (len == nla_len(param_data) ||