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/* lnet structure which will keep a list of UDSPs */
struct lnet {
	...
	list_head ln_udsp_list;
	...
};

/* net descriptor */
struct lnet_ud_net_descr {
	__u32 udn_net_type;
	list_head udn_net_num_range;
};

/* each NID range is defined as net_id and an ip range */
struct lnet_ud_nid_descr {
	struct lnet_ud_u32net_descr ud_net_id;
	list_head ud_ip_range;
};

/* UDSP action types */
enum lnet_udsp_action_type {
	EN_LNET_UDSP_ACTION_NONE = 0,
	EN_LNET_UDSP_ACTION_PRIORITY,
};

 /*
 * a UDSP rule can have up to three user defined NID descriptors
 * 		- src: defines the local NID range for the rule
 * 		- dst: defines the peer NID range for the rule
 * 		- rte: defines the router NID range for the rule
 *
 * An action union defines the action to take when the rule
 * is matched
 */ 
struct lnet_udsp {
	list_head udsp_on_list;
	__u32 idx;
	lnet_ud_nid_descr *udsp_src;
	lnet_ud_nid_describedescr *udsp_dst;
	lnet_ud_nid_descr *udsp_rte;
	enum lnet_udsp_action_type udsp_action_type;
	union udsp_action {
		__u32 udsp_priority;
	};
};

/* The rules are flattened in the LNet structures as shown below */
struct lnet_net {
...
	/* defines the relative priority of this net compared to others in the system */
	__u32 net_priority;
...
};


struct lnet_ni {
...
	/* defines the relative priority of this NI compared to other NIs in the net */
	__u32 ni_priority;
...
};

struct lnet_peer_net {
...
	/* defines the relative priority of this peer net compared to others in the system */
	__u32 lpn_priority;
...
};

struct lnet_peer_ni {
...
	/* defines the relative peer_ni priority compared to other peer_nis in the peer */
	__u32 lpni_priority;

	/* defines the list of local NID(s) (>=1) which should be used as the source */
	union lpni_pref {
		lnet_nid_t nid;
		lnet_nid_t *nids;
	}

	/*
	 *	defines the list of router NID(s) to be used when sending to this peer NI
	 *	if the peer NI is remote
     */
	lnet_nid_t *lpni_rte_nids;
...
};

/* UDSPs will be passed to the kernel via IOCTL */
#define IOC_LIBCFS_ADD_UDSP _IOWR(IOC_LIBCFS_TYPE, 106, IOCTL_CONFIG_SIZE)
#define IOC_LIBCFS_DEL_UDSP _IOWR(IOC_LIBCFS_TYPE, 107, IOCTL_CONFIG_SIZE)
#define IOC_LIBCFS_GET_UDSP _IOWR(IOC_LIBCFS_TYPE, 108, IOCTL_CONFIG_SIZE)
#define IOC_LIBCFS_GET_UDSP_SIZE _IOWR(IOC_LIBCFS_TYPE, 108, IOCTL_CONFIG_SIZE)