156 lines
5.1 KiB
C
156 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Lan Emulation client header file
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*
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* Marko Kiiskila <mkiiskila@yahoo.com>
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*/
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#ifndef _LEC_H_
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#define _LEC_H_
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#include <linux/atmdev.h>
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#include <linux/netdevice.h>
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#include <linux/atmlec.h>
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#define LEC_HEADER_LEN 16
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struct lecdatahdr_8023 {
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__be16 le_header;
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unsigned char h_dest[ETH_ALEN];
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unsigned char h_source[ETH_ALEN];
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__be16 h_type;
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};
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struct lecdatahdr_8025 {
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__be16 le_header;
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unsigned char ac_pad;
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unsigned char fc;
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unsigned char h_dest[ETH_ALEN];
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unsigned char h_source[ETH_ALEN];
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};
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#define LEC_MINIMUM_8023_SIZE 62
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#define LEC_MINIMUM_8025_SIZE 16
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/*
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* Operations that LANE2 capable device can do. Two first functions
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* are used to make the device do things. See spec 3.1.3 and 3.1.4.
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*
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* The third function is intended for the MPOA component sitting on
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* top of the LANE device. The MPOA component assigns it's own function
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* to (*associate_indicator)() and the LANE device will use that
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* function to tell about TLVs it sees floating through.
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*
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*/
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struct lane2_ops {
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int (*resolve) (struct net_device *dev, const u8 *dst_mac, int force,
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u8 **tlvs, u32 *sizeoftlvs);
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int (*associate_req) (struct net_device *dev, const u8 *lan_dst,
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const u8 *tlvs, u32 sizeoftlvs);
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void (*associate_indicator) (struct net_device *dev, const u8 *mac_addr,
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const u8 *tlvs, u32 sizeoftlvs);
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};
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/*
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* ATM LAN Emulation supports both LLC & Dix Ethernet EtherType
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* frames.
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*
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* 1. Dix Ethernet EtherType frames encoded by placing EtherType
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* field in h_type field. Data follows immediately after header.
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* 2. LLC Data frames whose total length, including LLC field and data,
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* but not padding required to meet the minimum data frame length,
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* is less than ETH_P_802_3_MIN MUST be encoded by placing that length
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* in the h_type field. The LLC field follows header immediately.
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* 3. LLC data frames longer than this maximum MUST be encoded by placing
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* the value 0 in the h_type field.
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*
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*/
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/* Hash table size */
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#define LEC_ARP_TABLE_SIZE 16
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struct lec_priv {
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unsigned short lecid; /* Lecid of this client */
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struct hlist_head lec_arp_empty_ones;
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/* Used for storing VCC's that don't have a MAC address attached yet */
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struct hlist_head lec_arp_tables[LEC_ARP_TABLE_SIZE];
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/* Actual LE ARP table */
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struct hlist_head lec_no_forward;
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/*
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* Used for storing VCC's (and forward packets from) which are to
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* age out by not using them to forward packets.
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* This is because to some LE clients there will be 2 VCCs. Only
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* one of them gets used.
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*/
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struct hlist_head mcast_fwds;
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/*
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* With LANEv2 it is possible that BUS (or a special multicast server)
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* establishes multiple Multicast Forward VCCs to us. This list
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* collects all those VCCs. LANEv1 client has only one item in this
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* list. These entries are not aged out.
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*/
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spinlock_t lec_arp_lock;
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struct atm_vcc *mcast_vcc; /* Default Multicast Send VCC */
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struct atm_vcc *lecd;
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struct delayed_work lec_arp_work; /* C10 */
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unsigned int maximum_unknown_frame_count;
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/*
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* Within the period of time defined by this variable, the client will send
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* no more than C10 frames to BUS for a given unicast destination. (C11)
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*/
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unsigned long max_unknown_frame_time;
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/*
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* If no traffic has been sent in this vcc for this period of time,
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* vcc will be torn down (C12)
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*/
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unsigned long vcc_timeout_period;
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/*
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* An LE Client MUST not retry an LE_ARP_REQUEST for a
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* given frame's LAN Destination more than maximum retry count times,
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* after the first LEC_ARP_REQUEST (C13)
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*/
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unsigned short max_retry_count;
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/*
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* Max time the client will maintain an entry in its arp cache in
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* absence of a verification of that relationship (C17)
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*/
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unsigned long aging_time;
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/*
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* Max time the client will maintain an entry in cache when
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* topology change flag is true (C18)
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*/
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unsigned long forward_delay_time; /* Topology change flag (C19) */
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int topology_change;
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/*
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* Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE
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* cycle to take (C20)
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*/
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unsigned long arp_response_time;
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/*
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* Time limit ot wait to receive an LE_FLUSH_RESPONSE after the
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* LE_FLUSH_REQUEST has been sent before taking recover action. (C21)
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*/
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unsigned long flush_timeout;
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/* The time since sending a frame to the bus after which the
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* LE Client may assume that the frame has been either discarded or
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* delivered to the recipient (C22)
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*/
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unsigned long path_switching_delay;
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u8 *tlvs; /* LANE2: TLVs are new */
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u32 sizeoftlvs; /* The size of the tlv array in bytes */
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int lane_version; /* LANE2 */
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int itfnum; /* e.g. 2 for lec2, 5 for lec5 */
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struct lane2_ops *lane2_ops; /* can be NULL for LANE v1 */
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int is_proxy; /* bridge between ATM and Ethernet */
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};
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struct lec_vcc_priv {
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void (*old_pop) (struct atm_vcc *vcc, struct sk_buff *skb);
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int xoff;
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};
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#define LEC_VCC_PRIV(vcc) ((struct lec_vcc_priv *)((vcc)->user_back))
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#endif /* _LEC_H_ */
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