1 /* $NetBSD: net_stats.c,v 1.3 2008/04/28 20:24:09 martin 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 1.3 2008/04/28 20:24:09 martin Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 #include <sys/sysctl.h> 38 39 #include <net/net_stats.h> 40 41 /* 42 * netstat_convert_to_user_cb -- 43 * Internal routine used as a call-back for percpu data enumeration. 44 */ 45 static void 46 netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) 47 { 48 const uint64_t *local_counters = v1; 49 netstat_sysctl_context *ctx = v2; 50 u_int i; 51 52 for (i = 0; i < ctx->ctx_ncounters; i++) 53 ctx->ctx_counters[i] += local_counters[i]; 54 } 55 56 /* 57 * netstat_convert_to_user -- 58 * Internal routine to convert per-CPU network statistics into 59 * collated form. 60 */ 61 static void 62 netstat_convert_to_user(netstat_sysctl_context *ctx) 63 { 64 65 memset(ctx->ctx_counters, 0, sizeof(uint64_t) * ctx->ctx_ncounters); 66 percpu_foreach(ctx->ctx_stat, netstat_convert_to_user_cb, ctx); 67 } 68 69 /* 70 * netstat_sysctl -- 71 * Common routine for collating and reporting network statistics 72 * that are gathered per-CPU. Statistics counters are assumed 73 * to be arrays of uint64_t's. 74 */ 75 int 76 netstat_sysctl(netstat_sysctl_context *ctx, SYSCTLFN_ARGS) 77 { 78 struct sysctlnode node; 79 80 netstat_convert_to_user(ctx); 81 node = *rnode; 82 node.sysctl_data = ctx->ctx_counters; 83 node.sysctl_size = sizeof(uint64_t) * ctx->ctx_ncounters; 84 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 85 } 86