bsd/net/net_perf.c

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <net/if_var.h>
  29 #include <net/net_perf.h>
  30 #include <netinet/in_var.h>
  31 #include <sys/sysctl.h>
  32
  33 static void ip_perf_record_stats(net_perf_t *npp, struct timeval *tv1,
  34     struct timeval *tv2, uint64_t num_pkts);
  35 static void update_bins(net_perf_t *npp, uint64_t bins);
  36
  37 void
  38 net_perf_start_time(net_perf_t *npp, struct timeval *tv)
  39 {
  40 #pragma unused(npp)
  41         microtime(tv);
  42 }
  43
  44 void
  45 net_perf_measure_time(net_perf_t *npp, struct timeval *start, uint64_t num_pkts)
  46 {
  47         struct timeval stop;
  48         microtime(&stop);
  49         ip_perf_record_stats(npp, start, &stop, num_pkts);
  50 }
  51
  52 static void
  53 ip_perf_record_stats(net_perf_t *npp, struct timeval *tv1, struct timeval *tv2, uint64_t num_pkts)
  54 {
  55         struct timeval tv_diff;
  56         uint64_t usecs;
  57         timersub(tv2, tv1, &tv_diff);
  58         usecs = tv_diff.tv_sec * 1000000ULL + tv_diff.tv_usec;
  59         OSAddAtomic64(usecs, &npp->np_total_usecs);
  60         OSAddAtomic64(num_pkts, &npp->np_total_pkts);
  61 }
  62
  63 static void
  64 update_bins(net_perf_t *npp, uint64_t bins)
  65 {
  66         bzero(&npp->np_hist_bars, sizeof(npp->np_hist_bars));
  67
  68         for (uint8_t i = 1, j = 0; i <= 64 && j < NET_PERF_BARS; i++) {
  69                 if (bins & 0x1) {
  70                         npp->np_hist_bars[j] = i;
  71                         j++;
  72                 }
  73                 bins >>= 1;
  74         }
  75 }
  76
  77 void
  78 net_perf_initialize(net_perf_t *npp, uint64_t bins)
  79 {
  80         bzero(npp, sizeof(net_perf_t));
  81         /* initialize np_hist_bars array */
  82         update_bins(npp, bins);
  83 }
  84
  85 void
  86 net_perf_histogram(net_perf_t *npp, uint64_t num_pkts)
  87 {
  88         if (num_pkts <= npp->np_hist_bars[0]) {
  89                 OSAddAtomic64(num_pkts, &npp->np_hist1);
  90         } else if (npp->np_hist_bars[0] < num_pkts && num_pkts <= npp->np_hist_bars[1]) {
  91                 OSAddAtomic64(num_pkts, &npp->np_hist2);
  92         } else if (npp->np_hist_bars[1] < num_pkts && num_pkts <= npp->np_hist_bars[2]) {
  93                 OSAddAtomic64(num_pkts, &npp->np_hist3);
  94         } else if (npp->np_hist_bars[2] < num_pkts && num_pkts <= npp->np_hist_bars[3]) {
  95                 OSAddAtomic64(num_pkts, &npp->np_hist4);
  96         } else if (npp->np_hist_bars[3] < num_pkts) {
  97                 OSAddAtomic64(num_pkts, &npp->np_hist5);
  98         }
  99 }
 100
 101 boolean_t
 102 net_perf_validate_bins(uint64_t bins)
 103 {
 104         return NET_PERF_BARS == __builtin_popcountll(bins);
 105 }