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net_stats.c revision 1.1 
      1 /*	$NetBSD: net_stats.c,v 1.1 2008/04/23 05:21:17 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  * 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 1.1 2008/04/23 05:21:17 thorpej 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 = ctx->ctx_ncounters;
     91 	return (sysctl_lookup(SYSCTLFN_CALL(&node)));
     92 }
     93