Author: sam
Date: Mon Jan 12 22:50:55 2009
New Revision: 187120
URL: http://svn.freebsd.org/changeset/base/187120
Log:
add tool to calculate air time for 802.11 packets
Added:
head/tools/tools/net80211/wlantxtime/
head/tools/tools/net80211/wlantxtime/Makefile (contents, props changed)
head/tools/tools/net80211/wlantxtime/wlantxtime.c (contents, props changed)
Modified:
head/tools/tools/net80211/Makefile
Modified: head/tools/tools/net80211/Makefile
==============================================================================
--- head/tools/tools/net80211/Makefile Mon Jan 12 22:37:05 2009
(r187119)
+++ head/tools/tools/net80211/Makefile Mon Jan 12 22:50:55 2009
(r187120)
@@ -1,5 +1,5 @@
# $FreeBSD$
-SUBDIR= stumbler w00t wesside wlaninject wlanstats wlanwatch wlanwds
+SUBDIR= stumbler w00t wesside wlaninject wlanstats wlantxtime wlanwatch
wlanwds
.include <bsd.subdir.mk>
Added: head/tools/tools/net80211/wlantxtime/Makefile
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/tools/tools/net80211/wlantxtime/Makefile Mon Jan 12 22:50:55
2009 (r187120)
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG= wlantxtime
+BINDIR= /usr/local/bin
+NO_MAN=
+
+.include <bsd.prog.mk>
Added: head/tools/tools/net80211/wlantxtime/wlantxtime.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/tools/tools/net80211/wlantxtime/wlantxtime.c Mon Jan 12 22:50:55
2009 (r187120)
@@ -0,0 +1,596 @@
+/*-
+ * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
+ * All rights reserved.
+ *
+ * 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 AUTHOR ``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 AUTHOR 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>
+__FBSDID("$FreeBSD$");
+
+/*
+ * IEEE 802.11 PHY-related support.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include <net/if_llc.h>
+
+#include <net80211/_ieee80211.h>
+#include <net80211/ieee80211.h>
+
+#define IEEE80211_F_SHPREAMBLE 0x00040000 /* STATUS: use short
preamble */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <unistd.h>
+
+struct ieee80211_rate_table {
+ int rateCount; /* NB: for proper padding */
+ uint8_t rateCodeToIndex[256]; /* back mapping */
+ struct {
+ uint8_t phy; /* CCK/OFDM/TURBO */
+ uint32_t rateKbps; /* transfer rate in kbs */
+ uint8_t shortPreamble; /* mask for enabling short
+ * preamble in CCK rate code */
+ uint8_t dot11Rate; /* value for supported rates
+ * info element of MLME */
+ uint8_t ctlRateIndex; /* index of next lower basic
+ * rate; used for dur. calcs */
+ uint16_t lpAckDuration; /* long preamble ACK dur. */
+ uint16_t spAckDuration; /* short preamble ACK dur. */
+ } info[32];
+};
+
+uint16_t
+ieee80211_compute_duration(const struct ieee80211_rate_table *rt,
+ uint32_t frameLen, uint16_t rate, int isShortPreamble);
+
+#define KASSERT(c, msg) do { \
+ if (!(c)) { \
+ printf msg; \
+ putchar('\n'); \
+ exit(-1); \
+ } \
+} while (0)
+
+static void
+panic(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vprintf(fmt, ap);
+ va_end(ap);
+ exit(-1);
+}
+
+/* shorthands to compact tables for readability */
+#define OFDM IEEE80211_T_OFDM
+#define CCK IEEE80211_T_CCK
+#define TURBO IEEE80211_T_TURBO
+#define PBCC (IEEE80211_T_HT+1) /* XXX */
+#define B(r) (0x80 | r)
+#define Mb(x) (x*1000)
+
+static struct ieee80211_rate_table ieee80211_11b_table = {
+ .rateCount = 4, /* XXX no PBCC */
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = CCK, 1000, 0x00, B(2), 0 },/* 1 Mb */
+ [1] = { .phy = CCK, 2000, 0x04, B(4), 1 },/* 2 Mb */
+ [2] = { .phy = CCK, 5500, 0x04, B(11), 1 },/* 5.5 Mb */
+ [3] = { .phy = CCK, 11000, 0x04, B(22), 1 },/* 11 Mb */
+ [4] = { .phy = PBCC, 22000, 0x04, 44, 3 } /* 22 Mb */
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_11g_table = {
+ .rateCount = 12,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = CCK, 1000, 0x00, B(2), 0 },
+ [1] = { .phy = CCK, 2000, 0x04, B(4), 1 },
+ [2] = { .phy = CCK, 5500, 0x04, B(11), 2 },
+ [3] = { .phy = CCK, 11000, 0x04, B(22), 3 },
+ [4] = { .phy = OFDM, 6000, 0x00, 12, 4 },
+ [5] = { .phy = OFDM, 9000, 0x00, 18, 4 },
+ [6] = { .phy = OFDM, 12000, 0x00, 24, 6 },
+ [7] = { .phy = OFDM, 18000, 0x00, 36, 6 },
+ [8] = { .phy = OFDM, 24000, 0x00, 48, 8 },
+ [9] = { .phy = OFDM, 36000, 0x00, 72, 8 },
+ [10] = { .phy = OFDM, 48000, 0x00, 96, 8 },
+ [11] = { .phy = OFDM, 54000, 0x00, 108, 8 }
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_11a_table = {
+ .rateCount = 8,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = OFDM, 6000, 0x00, B(12), 0 },
+ [1] = { .phy = OFDM, 9000, 0x00, 18, 0 },
+ [2] = { .phy = OFDM, 12000, 0x00, B(24), 2 },
+ [3] = { .phy = OFDM, 18000, 0x00, 36, 2 },
+ [4] = { .phy = OFDM, 24000, 0x00, B(48), 4 },
+ [5] = { .phy = OFDM, 36000, 0x00, 72, 4 },
+ [6] = { .phy = OFDM, 48000, 0x00, 96, 4 },
+ [7] = { .phy = OFDM, 54000, 0x00, 108, 4 }
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_half_table = {
+ .rateCount = 8,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = OFDM, 3000, 0x00, B(6), 0 },
+ [1] = { .phy = OFDM, 4500, 0x00, 9, 0 },
+ [2] = { .phy = OFDM, 6000, 0x00, B(12), 2 },
+ [3] = { .phy = OFDM, 9000, 0x00, 18, 2 },
+ [4] = { .phy = OFDM, 12000, 0x00, B(24), 4 },
+ [5] = { .phy = OFDM, 18000, 0x00, 36, 4 },
+ [6] = { .phy = OFDM, 24000, 0x00, 48, 4 },
+ [7] = { .phy = OFDM, 27000, 0x00, 54, 4 }
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_quarter_table = {
+ .rateCount = 8,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = OFDM, 1500, 0x00, B(3), 0 },
+ [1] = { .phy = OFDM, 2250, 0x00, 4, 0 },
+ [2] = { .phy = OFDM, 3000, 0x00, B(9), 2 },
+ [3] = { .phy = OFDM, 4500, 0x00, 9, 2 },
+ [4] = { .phy = OFDM, 6000, 0x00, B(12), 4 },
+ [5] = { .phy = OFDM, 9000, 0x00, 18, 4 },
+ [6] = { .phy = OFDM, 12000, 0x00, 24, 4 },
+ [7] = { .phy = OFDM, 13500, 0x00, 27, 4 }
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_turbog_table = {
+ .rateCount = 7,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = TURBO, 12000, 0x00, B(12), 0 },
+ [1] = { .phy = TURBO, 24000, 0x00, B(24), 1 },
+ [2] = { .phy = TURBO, 36000, 0x00, 36, 1 },
+ [3] = { .phy = TURBO, 48000, 0x00, B(48), 3 },
+ [4] = { .phy = TURBO, 72000, 0x00, 72, 3 },
+ [5] = { .phy = TURBO, 96000, 0x00, 96, 3 },
+ [6] = { .phy = TURBO, 108000, 0x00, 108, 3 }
+ },
+};
+
+static struct ieee80211_rate_table ieee80211_turboa_table = {
+ .rateCount = 8,
+ .info = {
+/* short ctrl */
+/* Preamble dot11Rate Rate */
+ [0] = { .phy = TURBO, 12000, 0x00, B(12), 0 },
+ [1] = { .phy = TURBO, 18000, 0x00, 18, 0 },
+ [2] = { .phy = TURBO, 24000, 0x00, B(24), 2 },
+ [3] = { .phy = TURBO, 36000, 0x00, 36, 2 },
+ [4] = { .phy = TURBO, 48000, 0x00, B(48), 4 },
+ [5] = { .phy = TURBO, 72000, 0x00, 72, 4 },
+ [6] = { .phy = TURBO, 96000, 0x00, 96, 4 },
+ [7] = { .phy = TURBO, 108000, 0x00, 108, 4 }
+ },
+};
+
+#undef Mb
+#undef B
+#undef OFDM
+#undef CCK
+#undef TURBO
+#undef XR
+
+/*
+ * Setup a rate table's reverse lookup table and fill in
+ * ack durations. The reverse lookup tables are assumed
+ * to be initialized to zero (or at least the first entry).
+ * We use this as a key that indicates whether or not
+ * we've previously setup the reverse lookup table.
+ *
+ * XXX not reentrant, but shouldn't matter
+ */
+static void
+ieee80211_setup_ratetable(struct ieee80211_rate_table *rt)
+{
+#define N(a) (sizeof(a)/sizeof(a[0]))
+#define WLAN_CTRL_FRAME_SIZE \
+ (sizeof(struct ieee80211_frame_ack) + IEEE80211_CRC_LEN)
+
+ int i;
+
+ for (i = 0; i < N(rt->rateCodeToIndex); i++)
+ rt->rateCodeToIndex[i] = (uint8_t) -1;
+ for (i = 0; i < rt->rateCount; i++) {
+ uint8_t code = rt->info[i].dot11Rate;
+ uint8_t cix = rt->info[i].ctlRateIndex;
+ uint8_t ctl_rate = rt->info[cix].dot11Rate;
+
+ rt->rateCodeToIndex[code] = i;
+ if (code & IEEE80211_RATE_BASIC) {
+ /*
+ * Map w/o basic rate bit too.
+ */
+ code &= IEEE80211_RATE_VAL;
+ rt->rateCodeToIndex[code] = i;
+ }
+
+ /*
+ * XXX for 11g the control rate to use for 5.5 and 11 Mb/s
+ * depends on whether they are marked as basic rates;
+ * the static tables are setup with an 11b-compatible
+ * 2Mb/s rate which will work but is suboptimal
+ *
+ * NB: Control rate is always less than or equal to the
+ * current rate, so control rate's reverse lookup entry
+ * has been installed and following call is safe.
+ */
+ rt->info[i].lpAckDuration = ieee80211_compute_duration(rt,
+ WLAN_CTRL_FRAME_SIZE, ctl_rate, 0);
+ rt->info[i].spAckDuration = ieee80211_compute_duration(rt,
+ WLAN_CTRL_FRAME_SIZE, ctl_rate, IEEE80211_F_SHPREAMBLE);
+ }
+
+#undef WLAN_CTRL_FRAME_SIZE
+#undef N
+}
+
+/* Setup all rate tables */
+static void
+ieee80211_phy_init(void)
+{
+#define N(arr) (int)(sizeof(arr) / sizeof(arr[0]))
+ static struct ieee80211_rate_table * const ratetables[] = {
+ &ieee80211_half_table,
+ &ieee80211_quarter_table,
+ &ieee80211_11a_table,
+ &ieee80211_11g_table,
+ &ieee80211_turbog_table,
+ &ieee80211_turboa_table,
+ &ieee80211_turboa_table,
+ &ieee80211_11a_table,
+ &ieee80211_11g_table,
+ &ieee80211_11b_table
+ };
+ int i;
+
+ for (i = 0; i < N(ratetables); ++i)
+ ieee80211_setup_ratetable(ratetables[i]);
+
+#undef N
+}
+
+/*
+ * Compute the time to transmit a frame of length frameLen bytes
+ * using the specified rate, phy, and short preamble setting.
+ * SIFS is included.
+ */
+uint16_t
+ieee80211_compute_duration(const struct ieee80211_rate_table *rt,
+ uint32_t frameLen, uint16_t rate, int isShortPreamble)
+{
+ uint8_t rix = rt->rateCodeToIndex[rate];
+ uint32_t bitsPerSymbol, numBits, numSymbols, phyTime, txTime;
+ uint32_t kbps;
+
+ KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
+ kbps = rt->info[rix].rateKbps;
+ if (kbps == 0) /* XXX bandaid for channel changes */
+ return 0;
+
+ switch (rt->info[rix].phy) {
+ case IEEE80211_T_CCK:
+#define CCK_SIFS_TIME 10
+#define CCK_PREAMBLE_BITS 144
+#define CCK_PLCP_BITS 48
+ phyTime = CCK_PREAMBLE_BITS + CCK_PLCP_BITS;
+ if (isShortPreamble && rt->info[rix].shortPreamble)
+ phyTime >>= 1;
+ numBits = frameLen << 3;
+ txTime = CCK_SIFS_TIME + phyTime
+ + ((numBits * 1000)/kbps);
+ break;
+#undef CCK_SIFS_TIME
+#undef CCK_PREAMBLE_BITS
+#undef CCK_PLCP_BITS
+
+ case IEEE80211_T_OFDM:
+#define OFDM_SIFS_TIME 16
+#define OFDM_PREAMBLE_TIME 20
+#define OFDM_PLCP_BITS 22
+#define OFDM_SYMBOL_TIME 4
+
+#define OFDM_SIFS_TIME_HALF 32
+#define OFDM_PREAMBLE_TIME_HALF 40
+#define OFDM_PLCP_BITS_HALF 22
+#define OFDM_SYMBOL_TIME_HALF 8
+
+#define OFDM_SIFS_TIME_QUARTER 64
+#define OFDM_PREAMBLE_TIME_QUARTER 80
+#define OFDM_PLCP_BITS_QUARTER 22
+#define OFDM_SYMBOL_TIME_QUARTER 16
+ if (rt == &ieee80211_half_table) {
+ bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_QUARTER) /
1000;
+ KASSERT(bitsPerSymbol != 0, ("1/2 rate bps"));
+
+ numBits = OFDM_PLCP_BITS + (frameLen << 3);
+ numSymbols = howmany(numBits, bitsPerSymbol);
+ txTime = OFDM_SIFS_TIME_QUARTER
+ + OFDM_PREAMBLE_TIME_QUARTER
+ + (numSymbols *
OFDM_SYMBOL_TIME_QUARTER);
+ } else if (rt == &ieee80211_quarter_table) {
+ bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_HALF) / 1000;
+ KASSERT(bitsPerSymbol != 0, ("1/4 rate bps"));
+
+ numBits = OFDM_PLCP_BITS + (frameLen << 3);
+ numSymbols = howmany(numBits, bitsPerSymbol);
+ txTime = OFDM_SIFS_TIME_HALF
+ + OFDM_PREAMBLE_TIME_HALF
+ + (numSymbols * OFDM_SYMBOL_TIME_HALF);
+ } else { /* full rate channel */
+ bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME) / 1000;
+ KASSERT(bitsPerSymbol != 0, ("full rate bps"));
+
+ numBits = OFDM_PLCP_BITS + (frameLen << 3);
+ numSymbols = howmany(numBits, bitsPerSymbol);
+ txTime = OFDM_SIFS_TIME
+ + OFDM_PREAMBLE_TIME
+ + (numSymbols * OFDM_SYMBOL_TIME);
+ }
+ break;
+
+#undef OFDM_SIFS_TIME
+#undef OFDM_PREAMBLE_TIME
+#undef OFDM_PLCP_BITS
+#undef OFDM_SYMBOL_TIME
+
+ case IEEE80211_T_TURBO:
+#define TURBO_SIFS_TIME 8
+#define TURBO_PREAMBLE_TIME 14
+#define TURBO_PLCP_BITS 22
+#define TURBO_SYMBOL_TIME 4
+ /* we still save OFDM rates in kbps - so double them */
+ bitsPerSymbol = ((kbps << 1) * TURBO_SYMBOL_TIME) / 1000;
+ KASSERT(bitsPerSymbol != 0, ("turbo bps"));
+
+ numBits = TURBO_PLCP_BITS + (frameLen << 3);
+ numSymbols = howmany(numBits, bitsPerSymbol);
+ txTime = TURBO_SIFS_TIME + TURBO_PREAMBLE_TIME
+ + (numSymbols * TURBO_SYMBOL_TIME);
+ break;
+#undef TURBO_SIFS_TIME
+#undef TURBO_PREAMBLE_TIME
+#undef TURBO_PLCP_BITS
+#undef TURBO_SYMBOL_TIME
+
+ default:
+ panic("%s: unknown phy %u (rate %u)\n", __func__,
+ rt->info[rix].phy, rate);
+ break;
+ }
+ return txTime;
+}
+
+#define OFDM_PLCP_BITS 22
+#define HT_L_STF 8
+#define HT_L_LTF 8
+#define HT_L_SIG 4
+#define HT_SIG 8
+#define HT_STF 4
+#define HT_LTF(n) ((n) * 4)
+
+uint32_t
+ieee80211_compute_duration_ht(const struct ieee80211_rate_table *rt,
+ uint32_t frameLen, uint16_t rate,
+ int streams, int isht40, int isShortGI)
+{
+ static const uint16_t ht20_bps[16] = {
+ 26, 52, 78, 104, 156, 208, 234, 260,
+ 52, 104, 156, 208, 312, 416, 468, 520
+ };
+ static const uint16_t ht40_bps[16] = {
+ 54, 108, 162, 216, 324, 432, 486, 540,
+ 108, 216, 324, 432, 648, 864, 972, 1080,
+ };
+ uint32_t bitsPerSymbol, numBits, numSymbols, txTime;
+
+ KASSERT(rate & IEEE80211_RATE_MCS, ("not mcs %d", rate));
+ KASSERT((rate &~ IEEE80211_RATE_MCS) < 16, ("bad mcs 0x%x", rate));
+
+ if (isht40)
+ bitsPerSymbol = ht40_bps[rate & 0xf];
+ else
+ bitsPerSymbol = ht20_bps[rate & 0xf];
+ numBits = OFDM_PLCP_BITS + (frameLen << 3);
+ numSymbols = howmany(numBits, bitsPerSymbol);
+ if (isShortGI)
+ txTime = ((numSymbols * 18) + 4) / 5; /* 3.6us */
+ else
+ txTime = numSymbols * 4; /* 4us */
+ return txTime + HT_L_STF + HT_L_LTF +
+ HT_L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
+}
+
+static const struct ieee80211_rate_table *
+mode2table(const char *mode)
+{
+ if (strcasecmp(mode, "half") == 0)
+ return &ieee80211_half_table;
+ else if (strcasecmp(mode, "quarter") == 0)
+ return &ieee80211_quarter_table;
+ else if (strcasecmp(mode, "hta") == 0)
+ return &ieee80211_11a_table; /* XXX */
+ else if (strcasecmp(mode, "htg") == 0)
+ return &ieee80211_11g_table; /* XXX */
+ else if (strcasecmp(mode, "108g") == 0)
+ return &ieee80211_turbog_table;
+ else if (strcasecmp(mode, "sturbo") == 0)
+ return &ieee80211_turboa_table;
+ else if (strcasecmp(mode, "turbo") == 0)
+ return &ieee80211_turboa_table;
+ else if (strcasecmp(mode, "11a") == 0)
+ return &ieee80211_11a_table;
+ else if (strcasecmp(mode, "11g") == 0)
+ return &ieee80211_11g_table;
+ else if (strcasecmp(mode, "11b") == 0)
+ return &ieee80211_11b_table;
+ else
+ return NULL;
+}
+
+const char *
+srate(int rate)
+{
+ static char buf[32];
+ if (rate & 1)
+ snprintf(buf, sizeof(buf), "%u.5", rate/2);
+ else
+ snprintf(buf, sizeof(buf), "%u", rate/2);
+ return buf;
+}
+
+static int
+checkpreamble(const struct ieee80211_rate_table *rt, uint8_t rix,
+ int isShortPreamble, int verbose)
+{
+ if (isShortPreamble) {
+ if (rt->info[rix].phy != IEEE80211_T_CCK) {
+ if (verbose)
+ warnx("short preamble not meaningful, ignored");
+ isShortPreamble = 0;
+ } else if (!rt->info[rix].shortPreamble) {
+ if (verbose)
+ warnx("short preamble not meaningful with "
+ "rate %s, ignored",
+ srate(rt->info[rix].dot11Rate &~
IEEE80211_RATE_BASIC));
+ isShortPreamble = 0;
+ }
+ }
+ return isShortPreamble;
+}
+
+static void
+usage(const char *progname)
+{
+ fprintf(stderr, "usage: %s [-a] [-l framelen] [-m mode] [-r rate]
[-s]\n",
+ progname);
+ fprintf(stderr, "-a display calculations for all possible
rates\n");
+ fprintf(stderr, "-l framelen length in bytes of 802.11 payload
(default 1536)\n");
+ fprintf(stderr, "-m 11a calculate for 11a channel\n");
+ fprintf(stderr, "-m 11b calculate for 11b channel\n");
+ fprintf(stderr, "-m 11g calculate for 11g channel (default)\n");
+ fprintf(stderr, "-m half calculate for 1/2 width channel\n");
+ fprintf(stderr, "-m quarter calculate for 1/4 width channel\n");
+ fprintf(stderr, "-m 108g calculate for dynamic turbo 11g
channel\n");
+ fprintf(stderr, "-m sturbo calculate for static turbo channel\n");
+ fprintf(stderr, "-m turbo calculate for dynamic turbo 11a
channel\n");
+ fprintf(stderr, "-r rate IEEE rate code (default 54)\n");
+ fprintf(stderr, "-s short preamble (default long)\n");
+ exit(0);
+}
+
+int
+main(int argc, char *argv[])
+{
+ const struct ieee80211_rate_table *rt;
+ const char *mode;
+ uint32_t frameLen;
+ uint16_t rate;
+ uint16_t time;
+ uint8_t rix;
+ int ch, allrates, isShortPreamble, isShort;
+ float frate;
+
+ ieee80211_phy_init();
+
+ mode = "11g";
+ isShortPreamble = 0;
+ frameLen = 1500
+ + sizeof(struct ieee80211_frame)
+ + LLC_SNAPFRAMELEN
+ + IEEE80211_CRC_LEN
+ ;
+ rate = 2*54;
+ allrates = 0;
+ while ((ch = getopt(argc, argv, "al:m:r:s")) != -1) {
+ switch (ch) {
+ case 'a':
+ allrates = 1;
+ break;
+ case 'l':
+ frameLen = strtoul(optarg, NULL, 0);
+ break;
+ case 'm':
+ mode = optarg;
+ break;
+ case 'r':
+ frate = atof(optarg);
+ rate = (int) 2*frate;
+ break;
+ case 's':
+ isShortPreamble = 1;
+ break;
+ default:
+ usage(argv[0]);
+ break;
+ }
+ }
+ rt = mode2table(mode);
+ if (rt == NULL)
+ errx(-1, "unknown mode %s", mode);
+ if (!allrates) {
+ rix = rt->rateCodeToIndex[rate];
+ if (rix == (uint8_t) -1)
+ errx(-1, "rate %s not valid for mode %s", srate(rate),
mode);
+ isShort = checkpreamble(rt, rix, isShortPreamble, 1);
+
+ time = ieee80211_compute_duration(rt, frameLen, rate, isShort);
+ printf("%u usec to send %u bytes @ %s Mb/s, %s preamble\n",
+ time, frameLen, srate(rate),
+ isShort ? "short" : "long");
+ } else {
+ for (rix = 0; rix < rt->rateCount; rix++) {
+ rate = rt->info[rix].dot11Rate &~ IEEE80211_RATE_BASIC;
+ isShort = checkpreamble(rt, rix, isShortPreamble, 0);
+ time = ieee80211_compute_duration(rt, frameLen, rate,
+ isShort);
+ printf("%u usec to send %u bytes @ %s Mb/s, %s
preamble\n",
+ time, frameLen, srate(rate),
+ isShort ? "short" : "long");
+ }
+ }
+ return 0;
+}
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
