1 /* $NetBSD: net_stats.c,v 1.6 2020/02/07 12:35:33 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 1.6 2020/02/07 12:35:33 thorpej Exp $");
34
35 #include <sys/types.h>
36 #include <sys/systm.h>
37 #include <sys/sysctl.h>
38 #include <sys/kmem.h>
39 #include <sys/xcall.h>
40
41 #include <net/net_stats.h>
42
43 typedef struct {
44 uint64_t *ctx_counters; /* pointer to collated counter array */
45 u_int ctx_ncounters; /* number of counters in array */
46 } netstat_sysctl_context;
47
48 /*
49 * netstat_convert_to_user_cb --
50 * Internal routine used as a call-back for percpu data enumeration.
51 */
52 static void
netstat_convert_to_user_cb(void * v1,void * v2,struct cpu_info * ci)53 netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
54 {
55 const uint64_t *local_counters = v1;
56 netstat_sysctl_context *ctx = v2;
57 u_int i;
58
59 for (i = 0; i < ctx->ctx_ncounters; i++)
60 ctx->ctx_counters[i] += local_counters[i];
61 }
62
63 /*
64 * netstat_sysctl --
65 * Common routine for collating and reporting network statistics
66 * that are gathered per-CPU. Statistics counters are assumed
67 * to be arrays of uint64_t's.
68 */
69 int
netstat_sysctl(percpu_t * stat,u_int ncounters,SYSCTLFN_ARGS)70 netstat_sysctl(percpu_t *stat, u_int ncounters, SYSCTLFN_ARGS)
71 {
72 netstat_sysctl_context ctx;
73 struct sysctlnode node;
74 uint64_t *counters;
75 size_t countersize;
76 int rv;
77
78 countersize = sizeof(uint64_t) * ncounters;
79
80 counters = kmem_zalloc(countersize, KM_SLEEP);
81 ctx.ctx_counters = counters;
82 ctx.ctx_ncounters = ncounters;
83
84 percpu_foreach_xcall(stat, XC_HIGHPRI_IPL(IPL_SOFTNET),
85 netstat_convert_to_user_cb, &ctx);
86
87 node = *rnode;
88 node.sysctl_data = counters;
89 node.sysctl_size = countersize;
90 rv = sysctl_lookup(SYSCTLFN_CALL(&node));
91
92 kmem_free(counters, countersize);
93
94 return (rv);
95 }
96