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 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 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 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 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