474 lines
15 KiB
C
474 lines
15 KiB
C
/*-
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* Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
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* All rights reserved.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 PHY-related support.
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_phy.h>
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#ifdef notyet
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struct ieee80211_ds_plcp_hdr {
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uint8_t i_signal;
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uint8_t i_service;
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uint16_t i_length;
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uint16_t i_crc;
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} __packed;
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#endif /* notyet */
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/* shorthands to compact tables for readability */
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#define OFDM IEEE80211_T_OFDM
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#define CCK IEEE80211_T_CCK
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#define TURBO IEEE80211_T_TURBO
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#define PBCC (IEEE80211_T_HT+1) /* XXX */
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#define B(r) (0x80 | r)
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#define Mb(x) (x*1000)
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static struct ieee80211_rate_table ieee80211_11b_table = {
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.rateCount = 4, /* XXX no PBCC */
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = CCK, 1000, 0x00, B(2), 0 },/* 1 Mb */
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[1] = { .phy = CCK, 2000, 0x04, B(4), 1 },/* 2 Mb */
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[2] = { .phy = CCK, 5500, 0x04, B(11), 1 },/* 5.5 Mb */
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[3] = { .phy = CCK, 11000, 0x04, B(22), 1 },/* 11 Mb */
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[4] = { .phy = PBCC, 22000, 0x04, 44, 3 } /* 22 Mb */
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},
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};
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static struct ieee80211_rate_table ieee80211_11g_table = {
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.rateCount = 12,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = CCK, 1000, 0x00, B(2), 0 },
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[1] = { .phy = CCK, 2000, 0x04, B(4), 1 },
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[2] = { .phy = CCK, 5500, 0x04, B(11), 2 },
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[3] = { .phy = CCK, 11000, 0x04, B(22), 3 },
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[4] = { .phy = OFDM, 6000, 0x00, 12, 4 },
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[5] = { .phy = OFDM, 9000, 0x00, 18, 4 },
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[6] = { .phy = OFDM, 12000, 0x00, 24, 6 },
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[7] = { .phy = OFDM, 18000, 0x00, 36, 6 },
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[8] = { .phy = OFDM, 24000, 0x00, 48, 8 },
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[9] = { .phy = OFDM, 36000, 0x00, 72, 8 },
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[10] = { .phy = OFDM, 48000, 0x00, 96, 8 },
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[11] = { .phy = OFDM, 54000, 0x00, 108, 8 }
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},
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};
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static struct ieee80211_rate_table ieee80211_11a_table = {
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.rateCount = 8,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = OFDM, 6000, 0x00, B(12), 0 },
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[1] = { .phy = OFDM, 9000, 0x00, 18, 0 },
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[2] = { .phy = OFDM, 12000, 0x00, B(24), 2 },
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[3] = { .phy = OFDM, 18000, 0x00, 36, 2 },
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[4] = { .phy = OFDM, 24000, 0x00, B(48), 4 },
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[5] = { .phy = OFDM, 36000, 0x00, 72, 4 },
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[6] = { .phy = OFDM, 48000, 0x00, 96, 4 },
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[7] = { .phy = OFDM, 54000, 0x00, 108, 4 }
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},
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};
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static struct ieee80211_rate_table ieee80211_half_table = {
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.rateCount = 8,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = OFDM, 3000, 0x00, B(6), 0 },
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[1] = { .phy = OFDM, 4500, 0x00, 9, 0 },
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[2] = { .phy = OFDM, 6000, 0x00, B(12), 2 },
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[3] = { .phy = OFDM, 9000, 0x00, 18, 2 },
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[4] = { .phy = OFDM, 12000, 0x00, B(24), 4 },
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[5] = { .phy = OFDM, 18000, 0x00, 36, 4 },
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[6] = { .phy = OFDM, 24000, 0x00, 48, 4 },
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[7] = { .phy = OFDM, 27000, 0x00, 54, 4 }
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},
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};
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static struct ieee80211_rate_table ieee80211_quarter_table = {
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.rateCount = 8,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = OFDM, 1500, 0x00, B(3), 0 },
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[1] = { .phy = OFDM, 2250, 0x00, 4, 0 },
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[2] = { .phy = OFDM, 3000, 0x00, B(9), 2 },
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[3] = { .phy = OFDM, 4500, 0x00, 9, 2 },
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[4] = { .phy = OFDM, 6000, 0x00, B(12), 4 },
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[5] = { .phy = OFDM, 9000, 0x00, 18, 4 },
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[6] = { .phy = OFDM, 12000, 0x00, 24, 4 },
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[7] = { .phy = OFDM, 13500, 0x00, 27, 4 }
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},
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};
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static struct ieee80211_rate_table ieee80211_turbog_table = {
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.rateCount = 7,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = TURBO, 12000, 0x00, B(12), 0 },
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[1] = { .phy = TURBO, 24000, 0x00, B(24), 1 },
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[2] = { .phy = TURBO, 36000, 0x00, 36, 1 },
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[3] = { .phy = TURBO, 48000, 0x00, B(48), 3 },
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[4] = { .phy = TURBO, 72000, 0x00, 72, 3 },
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[5] = { .phy = TURBO, 96000, 0x00, 96, 3 },
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[6] = { .phy = TURBO, 108000, 0x00, 108, 3 }
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},
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};
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static struct ieee80211_rate_table ieee80211_turboa_table = {
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.rateCount = 8,
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.info = {
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/* short ctrl */
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/* Preamble dot11Rate Rate */
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[0] = { .phy = TURBO, 12000, 0x00, B(12), 0 },
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[1] = { .phy = TURBO, 18000, 0x00, 18, 0 },
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[2] = { .phy = TURBO, 24000, 0x00, B(24), 2 },
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[3] = { .phy = TURBO, 36000, 0x00, 36, 2 },
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[4] = { .phy = TURBO, 48000, 0x00, B(48), 4 },
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[5] = { .phy = TURBO, 72000, 0x00, 72, 4 },
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[6] = { .phy = TURBO, 96000, 0x00, 96, 4 },
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[7] = { .phy = TURBO, 108000, 0x00, 108, 4 }
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},
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};
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#undef Mb
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#undef B
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#undef OFDM
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#undef CCK
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#undef TURBO
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#undef XR
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/*
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* Setup a rate table's reverse lookup table and fill in
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* ack durations. The reverse lookup tables are assumed
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* to be initialized to zero (or at least the first entry).
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* We use this as a key that indicates whether or not
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* we've previously setup the reverse lookup table.
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*
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* XXX not reentrant, but shouldn't matter
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*/
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static void
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ieee80211_setup_ratetable(struct ieee80211_rate_table *rt)
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{
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#define N(a) (sizeof(a)/sizeof(a[0]))
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#define WLAN_CTRL_FRAME_SIZE \
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(sizeof(struct ieee80211_frame_ack) + IEEE80211_CRC_LEN)
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int i;
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for (i = 0; i < N(rt->rateCodeToIndex); i++)
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rt->rateCodeToIndex[i] = (uint8_t) -1;
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for (i = 0; i < rt->rateCount; i++) {
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uint8_t code = rt->info[i].dot11Rate;
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uint8_t cix = rt->info[i].ctlRateIndex;
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uint8_t ctl_rate = rt->info[cix].dot11Rate;
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rt->rateCodeToIndex[code] = i;
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if (code & IEEE80211_RATE_BASIC) {
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/*
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* Map w/o basic rate bit too.
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*/
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code &= IEEE80211_RATE_VAL;
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rt->rateCodeToIndex[code] = i;
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}
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/*
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* XXX for 11g the control rate to use for 5.5 and 11 Mb/s
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* depends on whether they are marked as basic rates;
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* the static tables are setup with an 11b-compatible
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* 2Mb/s rate which will work but is suboptimal
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*
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* NB: Control rate is always less than or equal to the
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* current rate, so control rate's reverse lookup entry
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* has been installed and following call is safe.
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*/
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rt->info[i].lpAckDuration = ieee80211_compute_duration(rt,
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WLAN_CTRL_FRAME_SIZE, ctl_rate, 0);
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rt->info[i].spAckDuration = ieee80211_compute_duration(rt,
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WLAN_CTRL_FRAME_SIZE, ctl_rate, IEEE80211_F_SHPREAMBLE);
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}
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#undef WLAN_CTRL_FRAME_SIZE
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#undef N
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}
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/* Setup all rate tables */
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static void
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ieee80211_phy_init(void)
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{
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#define N(arr) (int)(sizeof(arr) / sizeof(arr[0]))
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static struct ieee80211_rate_table * const ratetables[] = {
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&ieee80211_half_table,
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&ieee80211_quarter_table,
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&ieee80211_11a_table,
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&ieee80211_11g_table,
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&ieee80211_turbog_table,
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&ieee80211_turboa_table,
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&ieee80211_turboa_table,
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&ieee80211_11a_table,
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&ieee80211_11g_table,
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&ieee80211_11b_table
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};
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int i;
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for (i = 0; i < N(ratetables); ++i)
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ieee80211_setup_ratetable(ratetables[i]);
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#undef N
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}
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SYSINIT(wlan_phy, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_phy_init, NULL);
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const struct ieee80211_rate_table *
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ieee80211_get_ratetable(struct ieee80211_channel *c)
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{
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const struct ieee80211_rate_table *rt;
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/* XXX HT */
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if (IEEE80211_IS_CHAN_HALF(c))
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rt = &ieee80211_half_table;
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else if (IEEE80211_IS_CHAN_QUARTER(c))
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rt = &ieee80211_quarter_table;
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else if (IEEE80211_IS_CHAN_HTA(c))
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rt = &ieee80211_11a_table; /* XXX */
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else if (IEEE80211_IS_CHAN_HTG(c))
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rt = &ieee80211_11g_table; /* XXX */
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else if (IEEE80211_IS_CHAN_108G(c))
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rt = &ieee80211_turbog_table;
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else if (IEEE80211_IS_CHAN_ST(c))
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rt = &ieee80211_turboa_table;
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else if (IEEE80211_IS_CHAN_TURBO(c))
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rt = &ieee80211_turboa_table;
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else if (IEEE80211_IS_CHAN_A(c))
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rt = &ieee80211_11a_table;
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else if (IEEE80211_IS_CHAN_ANYG(c))
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rt = &ieee80211_11g_table;
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else if (IEEE80211_IS_CHAN_B(c))
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rt = &ieee80211_11b_table;
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else {
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/* NB: should not get here */
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panic("%s: no rate table for channel; freq %u flags 0x%x\n",
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__func__, c->ic_freq, c->ic_flags);
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}
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return rt;
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}
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/*
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* Convert PLCP signal/rate field to 802.11 rate (.5Mbits/s)
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*
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* Note we do no parameter checking; this routine is mainly
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* used to derive an 802.11 rate for constructing radiotap
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* header data for rx frames.
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*
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* XXX might be a candidate for inline
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*/
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uint8_t
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ieee80211_plcp2rate(uint8_t plcp, enum ieee80211_phytype type)
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{
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if (type == IEEE80211_T_OFDM) {
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static const uint8_t ofdm_plcp2rate[16] = {
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[0xb] = 12,
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[0xf] = 18,
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[0xa] = 24,
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[0xe] = 36,
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[0x9] = 48,
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[0xd] = 72,
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[0x8] = 96,
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[0xc] = 108
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};
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return ofdm_plcp2rate[plcp & 0xf];
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}
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if (type == IEEE80211_T_CCK) {
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static const uint8_t cck_plcp2rate[16] = {
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[0xa] = 2, /* 0x0a */
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[0x4] = 4, /* 0x14 */
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[0x7] = 11, /* 0x37 */
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[0xe] = 22, /* 0x6e */
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[0xc] = 44, /* 0xdc , actually PBCC */
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};
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return cck_plcp2rate[plcp & 0xf];
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}
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return 0;
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}
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/*
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* Covert 802.11 rate to PLCP signal.
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*/
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uint8_t
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ieee80211_rate2plcp(int rate, enum ieee80211_phytype type)
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{
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/* XXX ignore type for now since rates are unique */
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switch (rate) {
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/* OFDM rates (cf IEEE Std 802.11a-1999, pp. 14 Table 80) */
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case 12: return 0xb;
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case 18: return 0xf;
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case 24: return 0xa;
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case 36: return 0xe;
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case 48: return 0x9;
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case 72: return 0xd;
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case 96: return 0x8;
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case 108: return 0xc;
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/* CCK rates (IEEE Std 802.11b-1999 page 15, subclause 18.2.3.3) */
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case 2: return 10;
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case 4: return 20;
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case 11: return 55;
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case 22: return 110;
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/* IEEE Std 802.11g-2003 page 19, subclause 19.3.2.1 */
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case 44: return 220;
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}
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return 0; /* XXX unsupported/unknown rate */
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}
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/*
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* Compute the time to transmit a frame of length frameLen bytes
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* using the specified rate, phy, and short preamble setting.
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* SIFS is included.
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*/
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uint16_t
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ieee80211_compute_duration(const struct ieee80211_rate_table *rt,
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uint32_t frameLen, uint16_t rate, int isShortPreamble)
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{
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uint8_t rix = rt->rateCodeToIndex[rate];
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uint32_t bitsPerSymbol, numBits, numSymbols, phyTime, txTime;
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uint32_t kbps;
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KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
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kbps = rt->info[rix].rateKbps;
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if (kbps == 0) /* XXX bandaid for channel changes */
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return 0;
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switch (rt->info[rix].phy) {
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case IEEE80211_T_CCK:
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#define CCK_SIFS_TIME 10
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#define CCK_PREAMBLE_BITS 144
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#define CCK_PLCP_BITS 48
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phyTime = CCK_PREAMBLE_BITS + CCK_PLCP_BITS;
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if (isShortPreamble && rt->info[rix].shortPreamble)
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phyTime >>= 1;
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numBits = frameLen << 3;
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txTime = CCK_SIFS_TIME + phyTime
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+ ((numBits * 1000)/kbps);
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break;
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#undef CCK_SIFS_TIME
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#undef CCK_PREAMBLE_BITS
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#undef CCK_PLCP_BITS
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case IEEE80211_T_OFDM:
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#define OFDM_SIFS_TIME 16
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#define OFDM_PREAMBLE_TIME 20
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#define OFDM_PLCP_BITS 22
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#define OFDM_SYMBOL_TIME 4
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#define OFDM_SIFS_TIME_HALF 32
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#define OFDM_PREAMBLE_TIME_HALF 40
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#define OFDM_PLCP_BITS_HALF 22
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#define OFDM_SYMBOL_TIME_HALF 8
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#define OFDM_SIFS_TIME_QUARTER 64
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#define OFDM_PREAMBLE_TIME_QUARTER 80
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#define OFDM_PLCP_BITS_QUARTER 22
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#define OFDM_SYMBOL_TIME_QUARTER 16
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if (rt == &ieee80211_half_table) {
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bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_QUARTER) / 1000;
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KASSERT(bitsPerSymbol != 0, ("1/2 rate bps"));
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numBits = OFDM_PLCP_BITS + (frameLen << 3);
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numSymbols = howmany(numBits, bitsPerSymbol);
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txTime = OFDM_SIFS_TIME_QUARTER
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+ OFDM_PREAMBLE_TIME_QUARTER
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+ (numSymbols * OFDM_SYMBOL_TIME_QUARTER);
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} else if (rt == &ieee80211_quarter_table) {
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bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_HALF) / 1000;
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KASSERT(bitsPerSymbol != 0, ("1/4 rate bps"));
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numBits = OFDM_PLCP_BITS + (frameLen << 3);
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numSymbols = howmany(numBits, bitsPerSymbol);
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txTime = OFDM_SIFS_TIME_HALF
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+ OFDM_PREAMBLE_TIME_HALF
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+ (numSymbols * OFDM_SYMBOL_TIME_HALF);
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} else { /* full rate channel */
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bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME) / 1000;
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KASSERT(bitsPerSymbol != 0, ("full rate bps"));
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numBits = OFDM_PLCP_BITS + (frameLen << 3);
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numSymbols = howmany(numBits, bitsPerSymbol);
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txTime = OFDM_SIFS_TIME
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+ OFDM_PREAMBLE_TIME
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+ (numSymbols * OFDM_SYMBOL_TIME);
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}
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break;
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|
|
|
#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;
|
|
}
|