net/atm/lec.h

   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
  16 struct 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
  23 struct 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 intented 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  */
  44 struct 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 immediatelly 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 immediatelly.
  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
  71 struct 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         int is_trdev;                           /* Device type, 0 = Ethernet, 1 = TokenRing */
 146 };
 147
 148 struct lec_vcc_priv {
 149         void (*old_pop) (struct atm_vcc *vcc, struct sk_buff *skb);
 150         int xoff;
 151 };
 152
 153 #define LEC_VCC_PRIV(vcc)       ((struct lec_vcc_priv *)((vcc)->user_back))
 154
 155 #endif                          /* _LEC_H_ */