1 /* $NetBSD: net_stats.c,v 1.2 2008/04/26 08:17:01 yamt 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: net_stats.c,v 1.2 2008/04/26 08:17:01 yamt Exp $"); 41 42 #include <sys/types.h> 43 #include <sys/systm.h> 44 #include <sys/sysctl.h> 45 46 #include <net/net_stats.h> 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_convert_to_user -- 65 * Internal routine to convert per-CPU network statistics into 66 * collated form. 67 */ 68 static void 69 netstat_convert_to_user(netstat_sysctl_context *ctx) 70 { 71 72 memset(ctx->ctx_counters, 0, sizeof(uint64_t) * ctx->ctx_ncounters); 73 percpu_foreach(ctx->ctx_stat, netstat_convert_to_user_cb, ctx); 74 } 75 76 /* 77 * netstat_sysctl -- 78 * Common routine for collating and reporting network statistics 79 * that are gathered per-CPU. Statistics counters are assumed 80 * to be arrays of uint64_t's. 81 */ 82 int 83 netstat_sysctl(netstat_sysctl_context *ctx, SYSCTLFN_ARGS) 84 { 85 struct sysctlnode node; 86 87 netstat_convert_to_user(ctx); 88 node = *rnode; 89 node.sysctl_data = ctx->ctx_counters; 90 node.sysctl_size = sizeof(uint64_t) * ctx->ctx_ncounters; 91 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 92 } 93