1 /* $NetBSD: if_stats.c,v 1.5 2024/06/29 02:18:35 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: if_stats.c,v 1.5 2024/06/29 02:18:35 riastradh Exp $");
34
35 #include <sys/param.h>
36
37 #include <sys/mbuf.h>
38 #include <sys/sdt.h>
39 #include <sys/systm.h>
40 #include <sys/xcall.h>
41
42 #include <net/if.h>
43
44 #define IF_STATS_SIZE (sizeof(uint64_t) * IF_NSTATS)
45
46 SDT_PROBE_DEFINE3(sdt, net, interface, stat,
47 "struct ifnet *"/*ifp*/,
48 "if_stat_t"/*stat*/,
49 "int64_t"/*delta*/);
50
51 /*
52 * if_stats_init --
53 * Initialize statistics storage for a network interface.
54 */
55 void
if_stats_init(ifnet_t * const ifp)56 if_stats_init(ifnet_t * const ifp)
57 {
58 ifp->if_stats = percpu_alloc(IF_STATS_SIZE);
59 }
60
61 /*
62 * if_stats_fini --
63 * Tear down statistics storage for a network interface.
64 */
65 void
if_stats_fini(ifnet_t * const ifp)66 if_stats_fini(ifnet_t * const ifp)
67 {
68 percpu_t *pc = ifp->if_stats;
69 ifp->if_stats = NULL;
70 if (pc) {
71 percpu_free(pc, IF_STATS_SIZE);
72 }
73 }
74
75 struct if_stats_to_if_data_ctx {
76 struct if_data * const ifi;
77 const bool zero_stats;
78 };
79
80 static void
if_stats_to_if_data_cb(void * v1,void * v2,struct cpu_info * ci)81 if_stats_to_if_data_cb(void *v1, void *v2, struct cpu_info *ci)
82 {
83 const uint64_t * const local_counters = v1;
84 struct if_stats_to_if_data_ctx *ctx = v2;
85
86 int s = splnet();
87
88 if (ctx->ifi) {
89 ctx->ifi->ifi_ipackets += local_counters[if_ipackets];
90 ctx->ifi->ifi_ierrors += local_counters[if_ierrors];
91 ctx->ifi->ifi_opackets += local_counters[if_opackets];
92 ctx->ifi->ifi_oerrors += local_counters[if_oerrors];
93 ctx->ifi->ifi_collisions += local_counters[if_collisions];
94 ctx->ifi->ifi_ibytes += local_counters[if_ibytes];
95 ctx->ifi->ifi_obytes += local_counters[if_obytes];
96 ctx->ifi->ifi_imcasts += local_counters[if_imcasts];
97 ctx->ifi->ifi_omcasts += local_counters[if_omcasts];
98 ctx->ifi->ifi_iqdrops += local_counters[if_iqdrops];
99 ctx->ifi->ifi_noproto += local_counters[if_noproto];
100 }
101
102 if (ctx->zero_stats) {
103 memset(v1, 0, IF_STATS_SIZE);
104 }
105
106 splx(s);
107 }
108
109 /*
110 * if_stats_to_if_data --
111 * Collect the interface statistics and place them into the
112 * legacy if_data structure for reportig to user space.
113 * Optionally zeros the stats after collection.
114 */
115 void
if_stats_to_if_data(ifnet_t * const ifp,struct if_data * const ifi,const bool zero_stats)116 if_stats_to_if_data(ifnet_t * const ifp, struct if_data * const ifi,
117 const bool zero_stats)
118 {
119 struct if_stats_to_if_data_ctx ctx = {
120 .ifi = ifi,
121 .zero_stats = zero_stats,
122 };
123
124 memset(ifi, 0, sizeof(*ifi));
125 percpu_foreach_xcall(ifp->if_stats, XC_HIGHPRI_IPL(IPL_SOFTNET),
126 if_stats_to_if_data_cb, &ctx);
127 }
128