1/* $NetBSD: net_stats.c,v 1.4 2008/05/04 07:22:14 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2008 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#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: net_stats.c,v 1.4 2008/05/04 07:22:14 thorpej Exp $");
34
35#include <sys/types.h>
36#include <sys/systm.h>
37#include <sys/sysctl.h>
38#include <sys/kmem.h>
39
40#include <net/net_stats.h>
41
42typedef struct {
43 uint64_t *ctx_counters; /* pointer to collated counter array */
44 u_int ctx_ncounters; /* number of counters in array */
45} netstat_sysctl_context;
46
47/*
48 * netstat_convert_to_user_cb --
49 * Internal routine used as a call-back for percpu data enumeration.
50 */
51static void
52netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
53{
54 const uint64_t *local_counters = v1;
55 netstat_sysctl_context *ctx = v2;
56 u_int i;
57
58 for (i = 0; i < ctx->ctx_ncounters; i++)
59 ctx->ctx_counters[i] += local_counters[i];
60}
61
62/*
63 * netstat_sysctl --
64 * Common routine for collating and reporting network statistics
65 * that are gathered per-CPU. Statistics counters are assumed
66 * to be arrays of uint64_t's.
67 */
68int
69netstat_sysctl(percpu_t *stat, u_int ncounters, SYSCTLFN_ARGS)
70{
71 netstat_sysctl_context ctx;
72 struct sysctlnode node;
73 uint64_t *counters;
74 size_t countersize;
75 int rv;
76
77 countersize = sizeof(uint64_t) * ncounters;
78
79 counters = kmem_zalloc(countersize, KM_SLEEP);
80 if (counters == NULL)
81 return (ENOMEM);
82
83 ctx.ctx_counters = counters;
84 ctx.ctx_ncounters = ncounters;
85
86 percpu_foreach(stat, netstat_convert_to_user_cb, &ctx);
87
88 node = *rnode;
89 node.sysctl_data = counters;
90 node.sysctl_size = countersize;
91 rv = sysctl_lookup(SYSCTLFN_CALL(&node));
92
93 kmem_free(counters, countersize);
94
95 return (rv);
96}
97