45c700291a
In contrast to the direct access to the single SFF frame filters (which are indexed by the SFF CAN ID itself) the single EFF frame filters are arranged in a single linked hlist. To reduce the hlist traversal in the case of many filter subscriptions a hash based access is introduced for single EFF filters. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*/
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#ifndef AF_CAN_H
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#define AF_CAN_H
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/list.h>
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#include <linux/rcupdate.h>
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#include <linux/can.h>
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/* af_can rx dispatcher structures */
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struct receiver {
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struct hlist_node list;
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struct rcu_head rcu;
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canid_t can_id;
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canid_t mask;
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unsigned long matches;
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void (*func)(struct sk_buff *, void *);
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void *data;
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char *ident;
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};
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#define CAN_SFF_RCV_ARRAY_SZ (1 << CAN_SFF_ID_BITS)
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#define CAN_EFF_RCV_HASH_BITS 10
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#define CAN_EFF_RCV_ARRAY_SZ (1 << CAN_EFF_RCV_HASH_BITS)
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enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_MAX };
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/* per device receive filters linked at dev->ml_priv */
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struct dev_rcv_lists {
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struct hlist_head rx[RX_MAX];
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struct hlist_head rx_sff[CAN_SFF_RCV_ARRAY_SZ];
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struct hlist_head rx_eff[CAN_EFF_RCV_ARRAY_SZ];
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int remove_on_zero_entries;
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int entries;
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};
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/* statistic structures */
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/* can be reset e.g. by can_init_stats() */
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struct s_stats {
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unsigned long jiffies_init;
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unsigned long rx_frames;
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unsigned long tx_frames;
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unsigned long matches;
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unsigned long total_rx_rate;
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unsigned long total_tx_rate;
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unsigned long total_rx_match_ratio;
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unsigned long current_rx_rate;
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unsigned long current_tx_rate;
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unsigned long current_rx_match_ratio;
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unsigned long max_rx_rate;
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unsigned long max_tx_rate;
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unsigned long max_rx_match_ratio;
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unsigned long rx_frames_delta;
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unsigned long tx_frames_delta;
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unsigned long matches_delta;
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};
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/* persistent statistics */
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struct s_pstats {
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unsigned long stats_reset;
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unsigned long user_reset;
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unsigned long rcv_entries;
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unsigned long rcv_entries_max;
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};
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/* receive filters subscribed for 'all' CAN devices */
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extern struct dev_rcv_lists can_rx_alldev_list;
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/* function prototypes for the CAN networklayer procfs (proc.c) */
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void can_init_proc(void);
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void can_remove_proc(void);
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void can_stat_update(unsigned long data);
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/* structures and variables from af_can.c needed in proc.c for reading */
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extern struct timer_list can_stattimer; /* timer for statistics update */
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extern struct s_stats can_stats; /* packet statistics */
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extern struct s_pstats can_pstats; /* receive list statistics */
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extern struct hlist_head can_rx_dev_list; /* rx dispatcher structures */
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#endif /* AF_CAN_H */
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