b76f5a8427
For the reclamation phase we use the SLAB_DESTROY_BY_RCU mechanism, which require some extra checks in the lookup code: a) If the current socket was released, reallocated & inserted in another list it will short circuit the iteration for the current list, thus we need to restart the lookup. b) If the current socket was released, reallocated & inserted in the same list we just need to recheck it matches the look-up criteria and if not we can skip to the next element. In this case there is no need to restart the lookup, since sockets are inserted at the start of the list and the worst that will happen is that we will iterate throught some of the list elements more then once. Note that the /proc and multicast delivery was not yet converted to RCU, it still uses spinlocks for protection. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
#ifndef LLC_H
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#define LLC_H
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/*
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* Copyright (c) 1997 by Procom Technology, Inc.
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License as published by the Free Software Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License for more details.
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*/
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/rculist_nulls.h>
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#include <asm/atomic.h>
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struct net_device;
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struct packet_type;
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struct sk_buff;
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struct llc_addr {
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unsigned char lsap;
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unsigned char mac[IFHWADDRLEN];
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};
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#define LLC_SAP_STATE_INACTIVE 1
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#define LLC_SAP_STATE_ACTIVE 2
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/**
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* struct llc_sap - Defines the SAP component
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*
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* @station - station this sap belongs to
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* @state - sap state
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* @p_bit - only lowest-order bit used
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* @f_bit - only lowest-order bit used
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* @laddr - SAP value in this 'lsap'
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* @node - entry in station sap_list
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* @sk_list - LLC sockets this one manages
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*/
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struct llc_sap {
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unsigned char state;
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unsigned char p_bit;
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unsigned char f_bit;
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atomic_t refcnt;
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int (*rcv_func)(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt,
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struct net_device *orig_dev);
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struct llc_addr laddr;
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struct list_head node;
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spinlock_t sk_lock;
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struct hlist_nulls_head sk_list;
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};
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#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */
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#define LLC_DEST_SAP 1 /* Type 1 goes here */
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#define LLC_DEST_CONN 2 /* Type 2 goes here */
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extern struct list_head llc_sap_list;
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extern rwlock_t llc_sap_list_lock;
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extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev);
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extern int llc_mac_hdr_init(struct sk_buff *skb,
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const unsigned char *sa, const unsigned char *da);
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extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
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struct sk_buff *skb));
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extern void llc_remove_pack(int type);
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extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
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extern struct llc_sap *llc_sap_open(unsigned char lsap,
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int (*rcv)(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt,
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struct net_device *orig_dev));
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static inline void llc_sap_hold(struct llc_sap *sap)
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{
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atomic_inc(&sap->refcnt);
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}
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extern void llc_sap_close(struct llc_sap *sap);
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static inline void llc_sap_put(struct llc_sap *sap)
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{
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if (atomic_dec_and_test(&sap->refcnt))
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llc_sap_close(sap);
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}
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extern struct llc_sap *llc_sap_find(unsigned char sap_value);
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extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
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unsigned char *dmac, unsigned char dsap);
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extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
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extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
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extern int llc_station_init(void);
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extern void llc_station_exit(void);
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#ifdef CONFIG_PROC_FS
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extern int llc_proc_init(void);
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extern void llc_proc_exit(void);
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#else
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#define llc_proc_init() (0)
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#define llc_proc_exit() do { } while(0)
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#endif /* CONFIG_PROC_FS */
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#ifdef CONFIG_SYSCTL
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extern int llc_sysctl_init(void);
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extern void llc_sysctl_exit(void);
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extern int sysctl_llc2_ack_timeout;
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extern int sysctl_llc2_busy_timeout;
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extern int sysctl_llc2_p_timeout;
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extern int sysctl_llc2_rej_timeout;
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extern int sysctl_llc_station_ack_timeout;
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#else
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#define llc_sysctl_init() (0)
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#define llc_sysctl_exit() do { } while(0)
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#endif /* CONFIG_SYSCTL */
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#endif /* LLC_H */
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