| 1 | /* $NetBSD: net_stats.c,v 1.4 2008/05/04 07:22:14 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 1.4 2008/05/04 07:22:14 thorpej Exp $" ); |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/systm.h> |
| 37 | #include <sys/sysctl.h> |
| 38 | #include <sys/kmem.h> |
| 39 | |
| 40 | #include <net/net_stats.h> |
| 41 | |
| 42 | typedef struct { |
| 43 | uint64_t *ctx_counters; /* pointer to collated counter array */ |
| 44 | u_int ctx_ncounters; /* number of counters in array */ |
| 45 | } netstat_sysctl_context; |
| 46 | |
| 47 | /* |
| 48 | * netstat_convert_to_user_cb -- |
| 49 | * Internal routine used as a call-back for percpu data enumeration. |
| 50 | */ |
| 51 | static void |
| 52 | netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) |
| 53 | { |
| 54 | const uint64_t *local_counters = v1; |
| 55 | netstat_sysctl_context *ctx = v2; |
| 56 | u_int i; |
| 57 | |
| 58 | for (i = 0; i < ctx->ctx_ncounters; i++) |
| 59 | ctx->ctx_counters[i] += local_counters[i]; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * netstat_sysctl -- |
| 64 | * Common routine for collating and reporting network statistics |
| 65 | * that are gathered per-CPU. Statistics counters are assumed |
| 66 | * to be arrays of uint64_t's. |
| 67 | */ |
| 68 | int |
| 69 | netstat_sysctl(percpu_t *stat, u_int ncounters, SYSCTLFN_ARGS) |
| 70 | { |
| 71 | netstat_sysctl_context ctx; |
| 72 | struct sysctlnode node; |
| 73 | uint64_t *counters; |
| 74 | size_t countersize; |
| 75 | int rv; |
| 76 | |
| 77 | countersize = sizeof(uint64_t) * ncounters; |
| 78 | |
| 79 | counters = kmem_zalloc(countersize, KM_SLEEP); |
| 80 | if (counters == NULL) |
| 81 | return (ENOMEM); |
| 82 | |
| 83 | ctx.ctx_counters = counters; |
| 84 | ctx.ctx_ncounters = ncounters; |
| 85 | |
| 86 | percpu_foreach(stat, netstat_convert_to_user_cb, &ctx); |
| 87 | |
| 88 | node = *rnode; |
| 89 | node.sysctl_data = counters; |
| 90 | node.sysctl_size = countersize; |
| 91 | rv = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 92 | |
| 93 | kmem_free(counters, countersize); |
| 94 | |
| 95 | return (rv); |
| 96 | } |
| 97 | |