96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/* $NetBSD: net_stats.c,v 1.6 2020/02/07 12:35:33 thorpej Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: net_stats.c,v 1.6 2020/02/07 12:35:33 thorpej Exp $");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/kmem.h>
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#include <sys/xcall.h>
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#include <net/net_stats.h>
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typedef struct {
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uint64_t *ctx_counters; /* pointer to collated counter array */
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u_int ctx_ncounters; /* number of counters in array */
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} netstat_sysctl_context;
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/*
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* netstat_convert_to_user_cb --
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* Internal routine used as a call-back for percpu data enumeration.
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*/
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static void
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netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
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{
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const uint64_t *local_counters = v1;
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netstat_sysctl_context *ctx = v2;
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u_int i;
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for (i = 0; i < ctx->ctx_ncounters; i++)
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ctx->ctx_counters[i] += local_counters[i];
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}
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/*
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* netstat_sysctl --
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* Common routine for collating and reporting network statistics
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* that are gathered per-CPU. Statistics counters are assumed
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* to be arrays of uint64_t's.
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*/
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int
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netstat_sysctl(percpu_t *stat, u_int ncounters, SYSCTLFN_ARGS)
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{
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netstat_sysctl_context ctx;
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struct sysctlnode node;
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uint64_t *counters;
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size_t countersize;
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int rv;
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countersize = sizeof(uint64_t) * ncounters;
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counters = kmem_zalloc(countersize, KM_SLEEP);
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ctx.ctx_counters = counters;
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ctx.ctx_ncounters = ncounters;
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percpu_foreach_xcall(stat, XC_HIGHPRI_IPL(IPL_SOFTNET),
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netstat_convert_to_user_cb, &ctx);
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node = *rnode;
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node.sysctl_data = counters;
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node.sysctl_size = countersize;
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rv = sysctl_lookup(SYSCTLFN_CALL(&node));
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kmem_free(counters, countersize);
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return (rv);
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}
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