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 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 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