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lec.h
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1 /*
2  * Lan Emulation client header file
3  *
4  * Marko Kiiskila <[email protected]>
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 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  */
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 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 
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 };
146 
147 struct 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_ */
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