linux/net/atm/lec.h
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   1/*
   2 * Lan Emulation client header file
   3 *
   4 * Marko Kiiskila <mkiiskila@yahoo.com>
   5 */
   6
   7#ifndef _LEC_H_
   8#define _LEC_H_
   9
  10#include <linux/atmdev.h>
  11#include <linux/netdevice.h>
  12#include <linux/atmlec.h>
  13
  14#define LEC_HEADER_LEN 16
  15
  16struct lecdatahdr_8023 {
  17        __be16 le_header;
  18        unsigned char h_dest[ETH_ALEN];
  19        unsigned char h_source[ETH_ALEN];
  20        __be16 h_type;
  21};
  22
  23struct lecdatahdr_8025 {
  24        __be16 le_header;
  25        unsigned char ac_pad;
  26        unsigned char fc;
  27        unsigned char h_dest[ETH_ALEN];
  28        unsigned char h_source[ETH_ALEN];
  29};
  30
  31#define LEC_MINIMUM_8023_SIZE   62
  32#define LEC_MINIMUM_8025_SIZE   16
  33
  34/*
  35 * Operations that LANE2 capable device can do. Two first functions
  36 * are used to make the device do things. See spec 3.1.3 and 3.1.4.
  37 *
  38 * The third function is intended for the MPOA component sitting on
  39 * top of the LANE device. The MPOA component assigns it's own function
  40 * to (*associate_indicator)() and the LANE device will use that
  41 * function to tell about TLVs it sees floating through.
  42 *
  43 */
  44struct lane2_ops {
  45        int (*resolve) (struct net_device *dev, const u8 *dst_mac, int force,
  46                        u8 **tlvs, u32 *sizeoftlvs);
  47        int (*associate_req) (struct net_device *dev, const u8 *lan_dst,
  48                              const u8 *tlvs, u32 sizeoftlvs);
  49        void (*associate_indicator) (struct net_device *dev, const u8 *mac_addr,
  50                                     const u8 *tlvs, u32 sizeoftlvs);
  51};
  52
  53/*
  54 * ATM LAN Emulation supports both LLC & Dix Ethernet EtherType
  55 * frames.
  56 *
  57 * 1. Dix Ethernet EtherType frames encoded by placing EtherType
  58 *    field in h_type field. Data follows immediately after header.
  59 * 2. LLC Data frames whose total length, including LLC field and data,
  60 *    but not padding required to meet the minimum data frame length,
  61 *    is less than 1536(0x0600) MUST be encoded by placing that length
  62 *    in the h_type field. The LLC field follows header immediately.
  63 * 3. LLC data frames longer than this maximum MUST be encoded by placing
  64 *    the value 0 in the h_type field.
  65 *
  66 */
  67
  68/* Hash table size */
  69#define LEC_ARP_TABLE_SIZE 16
  70
  71struct lec_priv {
  72        unsigned short lecid;                   /* Lecid of this client */
  73        struct hlist_head lec_arp_empty_ones;
  74                                                /* Used for storing VCC's that don't have a MAC address attached yet */
  75        struct hlist_head lec_arp_tables[LEC_ARP_TABLE_SIZE];
  76                                                /* Actual LE ARP table */
  77        struct hlist_head lec_no_forward;
  78                                                /*
  79                                                 * Used for storing VCC's (and forward packets from) which are to
  80                                                 * age out by not using them to forward packets.
  81                                                 * This is because to some LE clients there will be 2 VCCs. Only
  82                                                 * one of them gets used.
  83                                                 */
  84        struct hlist_head mcast_fwds;
  85                                                /*
  86                                                 * With LANEv2 it is possible that BUS (or a special multicast server)
  87                                                 * establishes multiple Multicast Forward VCCs to us. This list
  88                                                 * collects all those VCCs. LANEv1 client has only one item in this
  89                                                 * list. These entries are not aged out.
  90                                                 */
  91        spinlock_t lec_arp_lock;
  92        struct atm_vcc *mcast_vcc;              /* Default Multicast Send VCC */
  93        struct atm_vcc *lecd;
  94        struct delayed_work lec_arp_work;       /* C10 */
  95        unsigned int maximum_unknown_frame_count;
  96                                                /*
  97                                                 * Within the period of time defined by this variable, the client will send
  98                                                 * no more than C10 frames to BUS for a given unicast destination. (C11)
  99                                                 */
 100        unsigned long max_unknown_frame_time;
 101                                                /*
 102                                                 * If no traffic has been sent in this vcc for this period of time,
 103                                                 * vcc will be torn down (C12)
 104                                                 */
 105        unsigned long vcc_timeout_period;
 106                                                /*
 107                                                 * An LE Client MUST not retry an LE_ARP_REQUEST for a
 108                                                 * given frame's LAN Destination more than maximum retry count times,
 109                                                 * after the first LEC_ARP_REQUEST (C13)
 110                                                 */
 111        unsigned short max_retry_count;
 112                                                /*
 113                                                 * Max time the client will maintain an entry in its arp cache in
 114                                                 * absence of a verification of that relationship (C17)
 115                                                 */
 116        unsigned long aging_time;
 117                                                /*
 118                                                 * Max time the client will maintain an entry in cache when
 119                                                 * topology change flag is true (C18)
 120                                                 */
 121        unsigned long forward_delay_time;       /* Topology change flag (C19) */
 122        int topology_change;
 123                                                /*
 124                                                 * Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE
 125                                                 * cycle to take (C20)
 126                                                 */
 127        unsigned long arp_response_time;
 128                                                /*
 129                                                 * Time limit ot wait to receive an LE_FLUSH_RESPONSE after the
 130                                                 * LE_FLUSH_REQUEST has been sent before taking recover action. (C21)
 131                                                 */
 132        unsigned long flush_timeout;
 133                                                /* The time since sending a frame to the bus after which the
 134                                                 * LE Client may assume that the frame has been either discarded or
 135                                                 * delivered to the recipient (C22)
 136                                                 */
 137        unsigned long path_switching_delay;
 138
 139        u8 *tlvs;                               /* LANE2: TLVs are new */
 140        u32 sizeoftlvs;                         /* The size of the tlv array in bytes */
 141        int lane_version;                       /* LANE2 */
 142        int itfnum;                             /* e.g. 2 for lec2, 5 for lec5 */
 143        struct lane2_ops *lane2_ops;            /* can be NULL for LANE v1 */
 144        int is_proxy;                           /* bridge between ATM and Ethernet */
 145};
 146
 147struct lec_vcc_priv {
 148        void (*old_pop) (struct atm_vcc *vcc, struct sk_buff *skb);
 149        int xoff;
 150};
 151
 152#define LEC_VCC_PRIV(vcc)       ((struct lec_vcc_priv *)((vcc)->user_back))
 153
 154#endif                          /* _LEC_H_ */
 155
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