1 /* $NetBSD: if_stats.c,v 1.4 2021/06/29 21:19:58 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 1.4 2021/06/29 21:19:58 riastradh Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/mbuf.h> 37 #include <sys/systm.h> 38 #include <sys/xcall.h> 39 40 #include <net/if.h> 41 42 #define IF_STATS_SIZE (sizeof(uint64_t) * IF_NSTATS) 43 44 /* 45 * if_stats_init -- 46 * Initialize statistics storage for a network interface. 47 */ 48 void 49 if_stats_init(ifnet_t * const ifp) 50 { 51 ifp->if_stats = percpu_alloc(IF_STATS_SIZE); 52 } 53 54 /* 55 * if_stats_fini -- 56 * Tear down statistics storage for a network interface. 57 */ 58 void 59 if_stats_fini(ifnet_t * const ifp) 60 { 61 percpu_t *pc = ifp->if_stats; 62 ifp->if_stats = NULL; 63 if (pc) { 64 percpu_free(pc, IF_STATS_SIZE); 65 } 66 } 67 68 struct if_stats_to_if_data_ctx { 69 struct if_data * const ifi; 70 const bool zero_stats; 71 }; 72 73 static void 74 if_stats_to_if_data_cb(void *v1, void *v2, struct cpu_info *ci) 75 { 76 const uint64_t * const local_counters = v1; 77 struct if_stats_to_if_data_ctx *ctx = v2; 78 79 int s = splnet(); 80 81 if (ctx->ifi) { 82 ctx->ifi->ifi_ipackets += local_counters[if_ipackets]; 83 ctx->ifi->ifi_ierrors += local_counters[if_ierrors]; 84 ctx->ifi->ifi_opackets += local_counters[if_opackets]; 85 ctx->ifi->ifi_oerrors += local_counters[if_oerrors]; 86 ctx->ifi->ifi_collisions += local_counters[if_collisions]; 87 ctx->ifi->ifi_ibytes += local_counters[if_ibytes]; 88 ctx->ifi->ifi_obytes += local_counters[if_obytes]; 89 ctx->ifi->ifi_imcasts += local_counters[if_imcasts]; 90 ctx->ifi->ifi_omcasts += local_counters[if_omcasts]; 91 ctx->ifi->ifi_iqdrops += local_counters[if_iqdrops]; 92 ctx->ifi->ifi_noproto += local_counters[if_noproto]; 93 } 94 95 if (ctx->zero_stats) { 96 memset(v1, 0, IF_STATS_SIZE); 97 } 98 99 splx(s); 100 } 101 102 /* 103 * if_stats_to_if_data -- 104 * Collect the interface statistics and place them into the 105 * legacy if_data structure for reportig to user space. 106 * Optionally zeros the stats after collection. 107 */ 108 void 109 if_stats_to_if_data(ifnet_t * const ifp, struct if_data * const ifi, 110 const bool zero_stats) 111 { 112 struct if_stats_to_if_data_ctx ctx = { 113 .ifi = ifi, 114 .zero_stats = zero_stats, 115 }; 116 117 memset(ifi, 0, sizeof(*ifi)); 118 percpu_foreach_xcall(ifp->if_stats, XC_HIGHPRI_IPL(IPL_SOFTNET), 119 if_stats_to_if_data_cb, &ctx); 120 } 121