[linux-2.6-block.git] / net / atm / lec.h

/*
 * Lan Emulation client header file
 *
 * Marko Kiiskila <mkiiskila@yahoo.com>
 */

#ifndef _LEC_H_
#define _LEC_H_

#include <linux/config.h>
#include <linux/atmdev.h>
#include <linux/netdevice.h>
#include <linux/atmlec.h>

#define LEC_HEADER_LEN 16

struct lecdatahdr_8023 {
	unsigned short le_header;
	unsigned char h_dest[ETH_ALEN];
	unsigned char h_source[ETH_ALEN];
	unsigned short h_type;
};

struct lecdatahdr_8025 {
	unsigned short le_header;
	unsigned char ac_pad;
	unsigned char fc;
	unsigned char h_dest[ETH_ALEN];
	unsigned char h_source[ETH_ALEN];
};

#define LEC_MINIMUM_8023_SIZE   62
#define LEC_MINIMUM_8025_SIZE   16

/*
 * Operations that LANE2 capable device can do. Two first functions
 * are used to make the device do things. See spec 3.1.3 and 3.1.4.
 *
 * The third function is intented for the MPOA component sitting on
 * top of the LANE device. The MPOA component assigns it's own function
 * to (*associate_indicator)() and the LANE device will use that
 * function to tell about TLVs it sees floating through.
 *
 */
struct lane2_ops {
	int (*resolve) (struct net_device *dev, u8 *dst_mac, int force,
			u8 **tlvs, u32 *sizeoftlvs);
	int (*associate_req) (struct net_device *dev, u8 *lan_dst,
			      u8 *tlvs, u32 sizeoftlvs);
	void (*associate_indicator) (struct net_device *dev, u8 *mac_addr,
				     u8 *tlvs, u32 sizeoftlvs);
};

/*
 * ATM LAN Emulation supports both LLC & Dix Ethernet EtherType
 * frames. 
 *
 * 1. Dix Ethernet EtherType frames encoded by placing EtherType
 *    field in h_type field. Data follows immediatelly after header.
 * 2. LLC Data frames whose total length, including LLC field and data,
 *    but not padding required to meet the minimum data frame length, 
 *    is less than 1536(0x0600) MUST be encoded by placing that length
 *    in the h_type field. The LLC field follows header immediatelly.
 * 3. LLC data frames longer than this maximum MUST be encoded by placing
 *    the value 0 in the h_type field.
 *
 */

/* Hash table size */
#define LEC_ARP_TABLE_SIZE 16

struct lec_priv {
	struct net_device_stats stats;
	unsigned short lecid;			/* Lecid of this client */
	struct lec_arp_table *lec_arp_empty_ones;
						/* Used for storing VCC's that don't have a MAC address attached yet */
	struct lec_arp_table *lec_arp_tables[LEC_ARP_TABLE_SIZE];
						/* Actual LE ARP table */
	struct lec_arp_table *lec_no_forward;
						/*
						 * Used for storing VCC's (and forward packets from) which are to
						 * age out by not using them to forward packets.
						 * This is because to some LE clients there will be 2 VCCs. Only
						 * one of them gets used.
						 */
	struct lec_arp_table *mcast_fwds;
						/*
						 * With LANEv2 it is possible that BUS (or a special multicast server)
						 * establishes multiple Multicast Forward VCCs to us. This list
						 * collects all those VCCs. LANEv1 client has only one item in this
						 * list. These entries are not aged out.
						 */
	spinlock_t lec_arp_lock;
	struct atm_vcc *mcast_vcc;		/* Default Multicast Send VCC */
	struct atm_vcc *lecd;
	struct timer_list lec_arp_timer;	/* C10 */
	unsigned int maximum_unknown_frame_count;
						/*
						 * Within the period of time defined by this variable, the client will send
						 * no more than C10 frames to BUS for a given unicast destination. (C11)
						 */
	unsigned long max_unknown_frame_time;
						/*
						 * If no traffic has been sent in this vcc for this period of time,
						 * vcc will be torn down (C12)
						 */
	unsigned long vcc_timeout_period;
						/*
						 * An LE Client MUST not retry an LE_ARP_REQUEST for a
						 * given frame's LAN Destination more than maximum retry count times,
						 * after the first LEC_ARP_REQUEST (C13)
						 */
	unsigned short max_retry_count;
						/*
						 * Max time the client will maintain an entry in its arp cache in
						 * absence of a verification of that relationship (C17)
						 */
	unsigned long aging_time;
						/*
						 * Max time the client will maintain an entry in cache when
						 * topology change flag is true (C18)
						 */
	unsigned long forward_delay_time;	/* Topology change flag (C19) */
	int topology_change;
						/*
						 * Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE
						 * cycle to take (C20)
						 */
	unsigned long arp_response_time;
						/*
						 * Time limit ot wait to receive an LE_FLUSH_RESPONSE after the
						 * LE_FLUSH_REQUEST has been sent before taking recover action. (C21)
						 */
	unsigned long flush_timeout;
						/* The time since sending a frame to the bus after which the
						 * LE Client may assume that the frame has been either discarded or
						 * delivered to the recipient (C22)
						 */
	unsigned long path_switching_delay;

	u8 *tlvs;				/* LANE2: TLVs are new */
	u32 sizeoftlvs;				/* The size of the tlv array in bytes */
	int lane_version;			/* LANE2 */
	int itfnum;				/* e.g. 2 for lec2, 5 for lec5 */
	struct lane2_ops *lane2_ops;		/* can be NULL for LANE v1 */
	int is_proxy;				/* bridge between ATM and Ethernet */
	int is_trdev;				/* Device type, 0 = Ethernet, 1 = TokenRing */
};

struct lec_vcc_priv {
	void (*old_pop) (struct atm_vcc *vcc, struct sk_buff *skb);
	int xoff;
};

#define LEC_VCC_PRIV(vcc)	((struct lec_vcc_priv *)((vcc)->user_back))

#endif				/* _LEC_H_ */
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Lan Emulation client header file
1da177e4 LT	3	*
1c9d3e72	4	* Marko Kiiskila <mkiiskila@yahoo.com>
1da177e4 LT	5	*/
	6
	7	#ifndef _LEC_H_
	8	#define _LEC_H_
	9
1c9d3e72	10	#include <linux/config.h>
1da177e4 LT	11	#include <linux/atmdev.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/atmlec.h>
	14
	15	#define LEC_HEADER_LEN 16
	16
	17	struct lecdatahdr_8023 {
1c9d3e72 CW	18	unsigned short le_header;
	19	unsigned char h_dest[ETH_ALEN];
	20	unsigned char h_source[ETH_ALEN];
	21	unsigned short h_type;
1da177e4 LT	22	};
	23
	24	struct lecdatahdr_8025 {
1c9d3e72 CW	25	unsigned short le_header;
	26	unsigned char ac_pad;
	27	unsigned char fc;
	28	unsigned char h_dest[ETH_ALEN];
	29	unsigned char h_source[ETH_ALEN];
1da177e4 LT	30	};
	31
	32	#define LEC_MINIMUM_8023_SIZE 62
	33	#define LEC_MINIMUM_8025_SIZE 16
	34
	35	/*
	36	* Operations that LANE2 capable device can do. Two first functions
	37	* are used to make the device do things. See spec 3.1.3 and 3.1.4.
	38	*
	39	* The third function is intented for the MPOA component sitting on
	40	* top of the LANE device. The MPOA component assigns it's own function
	41	* to (*associate_indicator)() and the LANE device will use that
	42	* function to tell about TLVs it sees floating through.
	43	*
	44	*/
	45	struct lane2_ops {
1c9d3e72 CW	46	int (resolve) (struct net_device dev, u8 *dst_mac, int force,
	47	u8 *tlvs, u32 sizeoftlvs);
	48	int (associate_req) (struct net_device dev, u8 *lan_dst,
	49	u8 *tlvs, u32 sizeoftlvs);
	50	void (associate_indicator) (struct net_device dev, u8 *mac_addr,
	51	u8 *tlvs, u32 sizeoftlvs);
1da177e4 LT	52	};
	53
	54	/*
	55	* ATM LAN Emulation supports both LLC & Dix Ethernet EtherType
	56	* frames.
1c9d3e72	57	*
1da177e4 LT	58	* 1. Dix Ethernet EtherType frames encoded by placing EtherType
	59	* field in h_type field. Data follows immediatelly after header.
	60	* 2. LLC Data frames whose total length, including LLC field and data,
	61	* but not padding required to meet the minimum data frame length,
	62	* is less than 1536(0x0600) MUST be encoded by placing that length
	63	* in the h_type field. The LLC field follows header immediatelly.
	64	* 3. LLC data frames longer than this maximum MUST be encoded by placing
	65	* the value 0 in the h_type field.
	66	*
	67	*/
	68
	69	/* Hash table size */
	70	#define LEC_ARP_TABLE_SIZE 16
	71
	72	struct lec_priv {
1c9d3e72 CW	73	struct net_device_stats stats;
	74	unsigned short lecid; /* Lecid of this client */
	75	struct lec_arp_table *lec_arp_empty_ones;
	76	/* Used for storing VCC's that don't have a MAC address attached yet */
	77	struct lec_arp_table *lec_arp_tables[LEC_ARP_TABLE_SIZE];
	78	/* Actual LE ARP table */
	79	struct lec_arp_table *lec_no_forward;
	80	/*
	81	* Used for storing VCC's (and forward packets from) which are to
	82	* age out by not using them to forward packets.
	83	* This is because to some LE clients there will be 2 VCCs. Only
	84	* one of them gets used.
	85	*/
	86	struct lec_arp_table *mcast_fwds;
	87	/*
	88	* With LANEv2 it is possible that BUS (or a special multicast server)
	89	* establishes multiple Multicast Forward VCCs to us. This list
	90	* collects all those VCCs. LANEv1 client has only one item in this
	91	* list. These entries are not aged out.
	92	*/
	93	spinlock_t lec_arp_lock;
	94	struct atm_vcc mcast_vcc; / Default Multicast Send VCC */
	95	struct atm_vcc *lecd;
	96	struct timer_list lec_arp_timer; /* C10 */
	97	unsigned int maximum_unknown_frame_count;
	98	/*
	99	* Within the period of time defined by this variable, the client will send
	100	* no more than C10 frames to BUS for a given unicast destination. (C11)
	101	*/
	102	unsigned long max_unknown_frame_time;
	103	/*
	104	* If no traffic has been sent in this vcc for this period of time,
	105	* vcc will be torn down (C12)
	106	*/
	107	unsigned long vcc_timeout_period;
	108	/*
	109	* An LE Client MUST not retry an LE_ARP_REQUEST for a
	110	* given frame's LAN Destination more than maximum retry count times,
	111	* after the first LEC_ARP_REQUEST (C13)
	112	*/
	113	unsigned short max_retry_count;
	114	/*
	115	* Max time the client will maintain an entry in its arp cache in
	116	* absence of a verification of that relationship (C17)
	117	*/
	118	unsigned long aging_time;
	119	/*
	120	* Max time the client will maintain an entry in cache when
	121	* topology change flag is true (C18)
	122	*/
	123	unsigned long forward_delay_time; /* Topology change flag (C19) */
	124	int topology_change;
	125	/*
	126	* Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE
	127	* cycle to take (C20)
	128	*/
	129	unsigned long arp_response_time;
	130	/*
	131	* Time limit ot wait to receive an LE_FLUSH_RESPONSE after the
	132	* LE_FLUSH_REQUEST has been sent before taking recover action. (C21)
	133	*/
	134	unsigned long flush_timeout;
	135	/* The time since sending a frame to the bus after which the
	136	* LE Client may assume that the frame has been either discarded or
137	* delivered to the recipient (C22)
138	*/
139	unsigned long path_switching_delay;
1da177e4	140
1c9d3e72 CW	141	u8 tlvs; / LANE2: TLVs are new */
	142	u32 sizeoftlvs; /* The size of the tlv array in bytes */
	143	int lane_version; /* LANE2 */
	144	int itfnum; /* e.g. 2 for lec2, 5 for lec5 */
	145	struct lane2_ops lane2_ops; / can be NULL for LANE v1 */
	146	int is_proxy; /* bridge between ATM and Ethernet */
	147	int is_trdev; /* Device type, 0 = Ethernet, 1 = TokenRing */
1da177e4 LT	148	};
	149
	150	struct lec_vcc_priv {
1c9d3e72	151	void (old_pop) (struct atm_vcc vcc, struct sk_buff *skb);
1da177e4 LT	152	int xoff;
	153	};
	154
	155	#define LEC_VCC_PRIV(vcc) ((struct lec_vcc_priv *)((vcc)->user_back))
	156
1c9d3e72	157	#endif /* _LEC_H_ */