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

/* each NID range is defined as net_id and an ip range */
struct lnet_ud_nid_descr {
	__u32 ud_net_id;
	list_head ud_ip_range;
}

/* UDSP action types */
enum lnet_udsp_action_type {
	EN_LNET_UDSP_ACTION_PRIORITY = 0,
	EN_LNET_UDSP_ACTION_NONE = 1,
}

 /*
 * 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_describe *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_remotenet {
...
	/* defines the relative priority of the remote net compared to other remote nets */
	__u32 lrn_priority;
...
}

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

/*
 * api-ni.c will be modified to handle adding a UDSP 
 * All UDSP operations are done under mutex and exclusive spin
 * lock to avoid constructs changing during application of the
 * policies.
 */
int
LNetCtl(unsigned int cmd, void *arg)
{
...
	case IOC_LIBCFS_ADD_UDSP: {
		struct lnet_ioctl_config_udsp *config_udsp = arg;
		mutex_lock(&the_lnet.ln_api_mutex);
		/*
		 * add and do initial flattening of the UDSP into
		 * internal structures.
		 */
		rc = lnet_add_and_flatten_udsp(config_udsp);
		mutex_unlock(&the_lnet.ln_api_mutex);
		return rc;
	}

	case IOC_LIBCFS_DEL_UDSP: {
		struct lnet_ioctl_config_udsp *del_udsp = arg;
		mutex_lock(&the_lnet.ln_api_mutex);
		/*
		 * delete the rule identified by index
		 */
		rc = lnet_del_udsp(del_udsp->udsp_idx);
		mutex_unlock(&the_lnet.ln_api_mutex);
		return rc;
	}

	case IOC_LIBCFS_GET_UDSP_SIZE: {
		struct lnet_ioctl_config_udsp *get_udsp = arg;
		mutex_lock(&the_lnet.ln_api_mutex);
		/*
		 * get the UDSP size specified by idx
		 */
		rc = lnet_get_udsp_num(get_udsp);
		mutex_unlock(&the_lnet.ln_api_mutex);
		return rc
	}

	case IOC_LIBCFS_GET_UDSP: {
		struct lnet_ioctl_config_udsp *get_udsp = arg;
		mutex_lock(&the_lnet.ln_api_mutex);
		/*
		 * get the udsp at index provided. Return -ENOENT if
		 * no more UDSPs to get
		 */
		rc = lnet_add_udsp(get_udsp, get_udsp->udsp_idx);
		mutex_unlock(&the_lnet.ln_api_mutex);
		return rc
	}
...
}