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      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