121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/* $NetBSD: if_stats.c,v 1.4 2021/06/29 21:19:58 riastradh Exp $ */
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/*-
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* Copyright (c) 2020 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: if_stats.c,v 1.4 2021/06/29 21:19:58 riastradh Exp $");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <sys/xcall.h>
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#include <net/if.h>
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#define IF_STATS_SIZE (sizeof(uint64_t) * IF_NSTATS)
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/*
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* if_stats_init --
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* Initialize statistics storage for a network interface.
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*/
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void
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if_stats_init(ifnet_t * const ifp)
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{
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ifp->if_stats = percpu_alloc(IF_STATS_SIZE);
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}
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/*
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* if_stats_fini --
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* Tear down statistics storage for a network interface.
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*/
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void
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if_stats_fini(ifnet_t * const ifp)
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{
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percpu_t *pc = ifp->if_stats;
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ifp->if_stats = NULL;
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if (pc) {
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percpu_free(pc, IF_STATS_SIZE);
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}
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}
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struct if_stats_to_if_data_ctx {
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struct if_data * const ifi;
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const bool zero_stats;
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};
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static void
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if_stats_to_if_data_cb(void *v1, void *v2, struct cpu_info *ci)
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{
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const uint64_t * const local_counters = v1;
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struct if_stats_to_if_data_ctx *ctx = v2;
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int s = splnet();
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if (ctx->ifi) {
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ctx->ifi->ifi_ipackets += local_counters[if_ipackets];
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ctx->ifi->ifi_ierrors += local_counters[if_ierrors];
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ctx->ifi->ifi_opackets += local_counters[if_opackets];
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ctx->ifi->ifi_oerrors += local_counters[if_oerrors];
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ctx->ifi->ifi_collisions += local_counters[if_collisions];
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ctx->ifi->ifi_ibytes += local_counters[if_ibytes];
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ctx->ifi->ifi_obytes += local_counters[if_obytes];
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ctx->ifi->ifi_imcasts += local_counters[if_imcasts];
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ctx->ifi->ifi_omcasts += local_counters[if_omcasts];
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ctx->ifi->ifi_iqdrops += local_counters[if_iqdrops];
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ctx->ifi->ifi_noproto += local_counters[if_noproto];
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}
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if (ctx->zero_stats) {
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memset(v1, 0, IF_STATS_SIZE);
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}
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splx(s);
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}
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/*
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* if_stats_to_if_data --
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* Collect the interface statistics and place them into the
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* legacy if_data structure for reportig to user space.
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* Optionally zeros the stats after collection.
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*/
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void
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if_stats_to_if_data(ifnet_t * const ifp, struct if_data * const ifi,
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const bool zero_stats)
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{
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struct if_stats_to_if_data_ctx ctx = {
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.ifi = ifi,
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.zero_stats = zero_stats,
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};
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memset(ifi, 0, sizeof(*ifi));
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percpu_foreach_xcall(ifp->if_stats, XC_HIGHPRI_IPL(IPL_SOFTNET),
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if_stats_to_if_data_cb, &ctx);
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}
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