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      1 /*	$NetBSD: net_stats.h,v 1.6 2024/06/29 13:01:30 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _NET_NET_STATS_H_
     33 #define _NET_NET_STATS_H_
     34 
     35 #ifdef _KERNEL
     36 #include <sys/percpu.h>
     37 
     38 typedef struct net_stat_ref {
     39 	/*
     40 	 * Flexible array member annoyingly requires some other
     41 	 * non-flexible array member.
     42 	 */
     43 	uint64_t	nsr_stat[1];
     44 	uint64_t	nsr_stats[];
     45 } *net_stat_ref_t;
     46 
     47 #define	_NET_STAT_GETREF(stat)	((net_stat_ref_t)percpu_getref((stat)))
     48 #define	_NET_STAT_PUTREF(stat)	percpu_putref((stat))
     49 
     50 #define	_NET_STATINC_REF(r, x)						\
     51 do {									\
     52 	uint64_t *_stat_ = (r)->nsr_stat;				\
     53 	_stat_[x]++;							\
     54 } while (/*CONSTCOND*/0)
     55 
     56 #define	_NET_STATINC(stat, x)						\
     57 do {									\
     58 	net_stat_ref_t _nsr_ = _NET_STAT_GETREF(stat);			\
     59 	_NET_STATINC_REF(_nsr_, x);					\
     60 	_NET_STAT_PUTREF(stat);						\
     61 } while (/*CONSTCOND*/0)
     62 
     63 #define	_NET_STATDEC_REF(r, x)						\
     64 do {									\
     65 	uint64_t *_stat_ = (r)->nsr_stat;				\
     66 	_stat_[x]--;							\
     67 } while (/*CONSTCOND*/0)
     68 
     69 #define	_NET_STATDEC(stat, x)						\
     70 do {									\
     71 	net_stat_ref_t _nsr_ = _NET_STAT_GETREF(stat);			\
     72 	_NET_STATDEC_REF(_nsr_, x);					\
     73 	_NET_STAT_PUTREF(stat);						\
     74 } while (/*CONSTCOND*/0)
     75 
     76 #define	_NET_STATADD_REF(r, x, v)					\
     77 do {									\
     78 	uint64_t *_stat_ = (r)->nsr_stat;				\
     79 	_stat_[x] += (v);						\
     80 } while (/*CONSTCOND*/0)
     81 
     82 #define	_NET_STATADD(stat, x, v)					\
     83 do {									\
     84 	net_stat_ref_t _nsr_ = _NET_STAT_GETREF(stat);			\
     85 	_NET_STATADD_REF(_nsr_, x, v);					\
     86 	_NET_STAT_PUTREF(stat);						\
     87 } while (/*CONSTCOND*/0)
     88 
     89 #define	_NET_STATSUB_REF(r, x, v)					\
     90 do {									\
     91 	uint64_t *_stat_ = (r)->nsr_stat;				\
     92 	_stat_[x] -= (v);						\
     93 } while (/*CONSTCOND*/0)
     94 
     95 #define	_NET_STATSUB(stat, x, v)					\
     96 do {									\
     97 	net_stat_ref_t _nsr_ = _NET_STAT_GETREF(stat);			\
     98 	_NET_STATSUB_REF(_nsr_, x, v);					\
     99 	_NET_STAT_PUTREF(stat);						\
    100 } while (/*CONSTCOND*/0)
    101 
    102 __BEGIN_DECLS
    103 struct lwp;
    104 struct sysctlnode;
    105 
    106 int	netstat_sysctl(percpu_t *, u_int,
    107 		       const int *, u_int, void *,
    108 		       size_t *, const void *, size_t,
    109 		       const int *, struct lwp *, const struct sysctlnode *);
    110 
    111 #define	NETSTAT_SYSCTL(stat, nctrs)					\
    112 	netstat_sysctl((stat), (nctrs), name, namelen, oldp, oldlenp,	\
    113 		       newp, newlen, oname, l, rnode)
    114 __END_DECLS
    115 #endif /* _KERNEL */
    116 
    117 #endif /* !_NET_NET_STATS_H_ */
    118