1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Lan Emulation client header file 4 * 5 * Marko Kiiskila <mkiiskila@yahoo.com> 6 */ 7 8#ifndef _LEC_H_ 9#define _LEC_H_ 10 11#include <linux/atmdev.h> 12#include <linux/netdevice.h> 13#include <linux/atmlec.h> 14 15#define LEC_HEADER_LEN 16 16 17struct lecdatahdr_8023 { 18 __be16 le_header; 19 unsigned char h_dest[ETH_ALEN]; 20 unsigned char h_source[ETH_ALEN]; 21 __be16 h_type; 22}; 23 24struct lecdatahdr_8025 { 25 __be16 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]; 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 intended 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 */ 45struct lane2_ops { 46 int (*resolve) (struct net_device *dev, const u8 *dst_mac, int force, 47 u8 **tlvs, u32 *sizeoftlvs); 48 int (*associate_req) (struct net_device *dev, const u8 *lan_dst, 49 const u8 *tlvs, u32 sizeoftlvs); 50 void (*associate_indicator) (struct net_device *dev, const u8 *mac_addr, 51 const u8 *tlvs, u32 sizeoftlvs); 52}; 53 54/* 55 * ATM LAN Emulation supports both LLC & Dix Ethernet EtherType 56 * frames. 57 * 58 * 1. Dix Ethernet EtherType frames encoded by placing EtherType 59 * field in h_type field. Data follows immediately 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 ETH_P_802_3_MIN MUST be encoded by placing that length 63 * in the h_type field. The LLC field follows header immediately. 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 72struct lec_priv { 73 unsigned short lecid; /* Lecid of this client */ 74 struct hlist_head lec_arp_empty_ones; 75 /* Used for storing VCC's that don't have a MAC address attached yet */ 76 struct hlist_head lec_arp_tables[LEC_ARP_TABLE_SIZE]; 77 /* Actual LE ARP table */ 78 struct hlist_head lec_no_forward; 79 /* 80 * Used for storing VCC's (and forward packets from) which are to 81 * age out by not using them to forward packets. 82 * This is because to some LE clients there will be 2 VCCs. Only 83 * one of them gets used. 84 */ 85 struct hlist_head mcast_fwds; 86 /* 87 * With LANEv2 it is possible that BUS (or a special multicast server) 88 * establishes multiple Multicast Forward VCCs to us. This list 89 * collects all those VCCs. LANEv1 client has only one item in this 90 * list. These entries are not aged out. 91 */ 92 spinlock_t lec_arp_lock; 93 struct atm_vcc *mcast_vcc; /* Default Multicast Send VCC */ 94 struct atm_vcc *lecd; 95 struct delayed_work lec_arp_work; /* C10 */ 96 unsigned int maximum_unknown_frame_count; 97 /* 98 * Within the period of time defined by this variable, the client will send 99 * no more than C10 frames to BUS for a given unicast destination. (C11) 100 */ 101 unsigned long max_unknown_frame_time; 102 /* 103 * If no traffic has been sent in this vcc for this period of time, 104 * vcc will be torn down (C12) 105 */ 106 unsigned long vcc_timeout_period; 107 /* 108 * An LE Client MUST not retry an LE_ARP_REQUEST for a 109 * given frame's LAN Destination more than maximum retry count times, 110 * after the first LEC_ARP_REQUEST (C13) 111 */ 112 unsigned short max_retry_count; 113 /* 114 * Max time the client will maintain an entry in its arp cache in 115 * absence of a verification of that relationship (C17) 116 */ 117 unsigned long aging_time; 118 /* 119 * Max time the client will maintain an entry in cache when 120 * topology change flag is true (C18) 121 */ 122 unsigned long forward_delay_time; /* Topology change flag (C19) */ 123 int topology_change; 124 /* 125 * Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE 126 * cycle to take (C20) 127 */ 128 unsigned long arp_response_time; 129 /* 130 * Time limit ot wait to receive an LE_FLUSH_RESPONSE after the 131 * LE_FLUSH_REQUEST has been sent before taking recover action. (C21) 132 */ 133 unsigned long flush_timeout; 134 /* The time since sending a frame to the bus after which the 135 * LE Client may assume that the frame has been either discarded or 136 * delivered to the recipient (C22) 137 */ 138 unsigned long path_switching_delay; 139 140 u8 *tlvs; /* LANE2: TLVs are new */ 141 u32 sizeoftlvs; /* The size of the tlv array in bytes */ 142 int lane_version; /* LANE2 */ 143 int itfnum; /* e.g. 2 for lec2, 5 for lec5 */ 144 struct lane2_ops *lane2_ops; /* can be NULL for LANE v1 */ 145 int is_proxy; /* bridge between ATM and Ethernet */ 146}; 147 148struct 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_ */ 156