FreeBSD/Linux Kernel Cross Reference
sys/net/net_stats.c

     /*      $NetBSD: net_stats.c,v 1.4 2008/05/04 07:22:14 thorpej Exp $    */
     
     /*-
      * Copyright (c) 2008 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: net_stats.c,v 1.4 2008/05/04 07:22:14 thorpej Exp $");
    
    #include <sys/types.h>
    #include <sys/systm.h>
    #include <sys/sysctl.h>
    #include <sys/kmem.h>
    
    #include <net/net_stats.h>
    
    typedef struct {
            uint64_t        *ctx_counters;  /* pointer to collated counter array */
            u_int            ctx_ncounters; /* number of counters in array */
    } netstat_sysctl_context;
    
    /*
     * netstat_convert_to_user_cb --
     *      Internal routine used as a call-back for percpu data enumeration.
     */
    static void
    netstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
    {
            const uint64_t *local_counters = v1;
            netstat_sysctl_context *ctx = v2;
            u_int i;
    
            for (i = 0; i < ctx->ctx_ncounters; i++)
                    ctx->ctx_counters[i] += local_counters[i];
    }
    
    /*
     * netstat_sysctl --
     *      Common routine for collating and reporting network statistics
     *      that are gathered per-CPU.  Statistics counters are assumed
     *      to be arrays of uint64_t's.
     */
    int
    netstat_sysctl(percpu_t *stat, u_int ncounters, SYSCTLFN_ARGS)
    {
            netstat_sysctl_context ctx;
            struct sysctlnode node;
            uint64_t *counters;
            size_t countersize;
            int rv;
    
            countersize = sizeof(uint64_t) * ncounters;
    
            counters = kmem_zalloc(countersize, KM_SLEEP);
            if (counters == NULL)
                    return (ENOMEM);
    
            ctx.ctx_counters = counters;
            ctx.ctx_ncounters = ncounters;
    
            percpu_foreach(stat, netstat_convert_to_user_cb, &ctx);
    
            node = *rnode;
            node.sysctl_data = counters;
            node.sysctl_size = countersize;
            rv = sysctl_lookup(SYSCTLFN_CALL(&node));
    
            kmem_free(counters, countersize);
    
            return (rv);
    }

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