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![Arvid Brodin](/assets/img/avatar_default.png)
This patch removes the separate paths for frames coming from the outside, and frames sent from the HSR device, and instead makes all frames go through hsr_forward_skb() in hsr_forward.c. This greatly improves code readability and also opens up the possibility for future support of the HSR Interlink device that is the basis for HSR RedBoxes and HSR QuadBoxes, as well as VLAN compatibility. Other improvements: * A reduction in the number of times an skb is copied on machines without HAVE_EFFICIENT_UNALIGNED_ACCESS, which improves throughput somewhat. * Headers are now created using the standard eth_header(), and using the standard hard_header_len. * Each HSR slave now gets its own private skb, so slave-specific fields can be correctly set. Signed-off-by: Arvid Brodin <arvid.brodin@alten.se> Signed-off-by: David S. Miller <davem@davemloft.net>
183 lines
4.9 KiB
C
183 lines
4.9 KiB
C
/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*/
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#ifndef __HSR_PRIVATE_H
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#define __HSR_PRIVATE_H
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#include <linux/netdevice.h>
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#include <linux/list.h>
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/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
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* Table 8.
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* All values in milliseconds.
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*/
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#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
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#define HSR_NODE_FORGET_TIME 60000 /* ms */
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#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
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/* By how much may slave1 and slave2 timestamps of latest received frame from
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* each node differ before we notify of communication problem?
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*/
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#define MAX_SLAVE_DIFF 3000 /* ms */
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#define HSR_SEQNR_START (USHRT_MAX - 1024)
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/* How often shall we check for broken ring and remove node entries older than
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* HSR_NODE_FORGET_TIME?
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*/
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#define PRUNE_PERIOD 3000 /* ms */
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#define HSR_TLV_ANNOUNCE 22
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#define HSR_TLV_LIFE_CHECK 23
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/* HSR Tag.
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* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
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* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
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* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
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* encapsulated protocol } instead.
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*
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_tag {
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__be16 path_and_LSDU_size;
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__be16 sequence_nr;
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__be16 encap_proto;
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} __packed;
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#define HSR_HLEN 6
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/* The helper functions below assumes that 'path' occupies the 4 most
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* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
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* equivalently, the 4 most significant bits of HSR tag byte 14).
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*
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* This is unclear in the IEC specification; its definition of MAC addresses
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* indicates the spec is written with the least significant bit first (to the
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* left). This, however, would mean that the LSDU field would be split in two
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* with the path field in-between, which seems strange. I'm guessing the MAC
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* address definition is in error.
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*/
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static inline u16 get_hsr_tag_path(struct hsr_tag *ht)
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{
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return ntohs(ht->path_and_LSDU_size) >> 12;
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}
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static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
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{
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return ntohs(ht->path_and_LSDU_size) & 0x0FFF;
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}
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static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
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{
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ht->path_and_LSDU_size = htons(
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(ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
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}
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static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
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{
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ht->path_and_LSDU_size = htons(
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(ntohs(ht->path_and_LSDU_size) & 0xF000) |
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(LSDU_size & 0x0FFF));
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}
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struct hsr_ethhdr {
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struct ethhdr ethhdr;
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struct hsr_tag hsr_tag;
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} __packed;
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/* HSR Supervision Frame data types.
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_sup_tag {
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__be16 path_and_HSR_Ver;
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__be16 sequence_nr;
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__u8 HSR_TLV_Type;
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__u8 HSR_TLV_Length;
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} __packed;
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struct hsr_sup_payload {
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unsigned char MacAddressA[ETH_ALEN];
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} __packed;
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static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
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{
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return get_hsr_tag_path((struct hsr_tag *) hst);
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}
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static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst)
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{
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return get_hsr_tag_LSDU_size((struct hsr_tag *) hst);
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}
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static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
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{
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set_hsr_tag_path((struct hsr_tag *) hst, path);
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}
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static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver)
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{
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set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver);
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}
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struct hsr_ethhdr_sp {
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struct ethhdr ethhdr;
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struct hsr_sup_tag hsr_sup;
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} __packed;
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enum hsr_port_type {
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HSR_PT_NONE = 0, /* Must be 0, used by framereg */
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HSR_PT_SLAVE_A,
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HSR_PT_SLAVE_B,
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HSR_PT_INTERLINK,
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HSR_PT_MASTER,
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HSR_PT_PORTS, /* This must be the last item in the enum */
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};
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struct hsr_port {
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struct list_head port_list;
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struct net_device *dev;
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struct hsr_priv *hsr;
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enum hsr_port_type type;
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};
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struct hsr_priv {
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struct rcu_head rcu_head;
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struct list_head ports;
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struct list_head node_db; /* Known HSR nodes */
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struct list_head self_node_db; /* MACs of slaves */
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struct timer_list announce_timer; /* Supervision frame dispatch */
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struct timer_list prune_timer;
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int announce_count;
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u16 sequence_nr;
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spinlock_t seqnr_lock; /* locking for sequence_nr */
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unsigned char sup_multicast_addr[ETH_ALEN];
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};
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#define hsr_for_each_port(hsr, port) \
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list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
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struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
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/* Caller must ensure skb is a valid HSR frame */
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static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
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return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
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}
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#endif /* __HSR_PRIVATE_H */
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