fe267a5590
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
627 lines
21 KiB
C
627 lines
21 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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/malloc.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 <net/ethernet.h>
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#include <net/route.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 HALF IEEE80211_T_OFDM_HALF
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#define QUART IEEE80211_T_OFDM_QUARTER
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#define HT IEEE80211_T_HT
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/* XXX the 11n and the basic rate flag are unfortunately overlapping. Grr. */
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#define N(r) (IEEE80211_RATE_MCS | r)
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#define PBCC (IEEE80211_T_OFDM_QUARTER+1) /* XXX */
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#define B(r) (IEEE80211_RATE_BASIC | 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 = HALF, 3000, 0x00, B(6), 0 },
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[1] = { .phy = HALF, 4500, 0x00, 9, 0 },
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[2] = { .phy = HALF, 6000, 0x00, B(12), 2 },
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[3] = { .phy = HALF, 9000, 0x00, 18, 2 },
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[4] = { .phy = HALF, 12000, 0x00, B(24), 4 },
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[5] = { .phy = HALF, 18000, 0x00, 36, 4 },
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[6] = { .phy = HALF, 24000, 0x00, 48, 4 },
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[7] = { .phy = HALF, 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 = QUART, 1500, 0x00, B(3), 0 },
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[1] = { .phy = QUART, 2250, 0x00, 4, 0 },
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[2] = { .phy = QUART, 3000, 0x00, B(9), 2 },
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[3] = { .phy = QUART, 4500, 0x00, 9, 2 },
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[4] = { .phy = QUART, 6000, 0x00, B(12), 4 },
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[5] = { .phy = QUART, 9000, 0x00, 18, 4 },
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[6] = { .phy = QUART, 12000, 0x00, 24, 4 },
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[7] = { .phy = QUART, 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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static struct ieee80211_rate_table ieee80211_11ng_table = {
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.rateCount = 36,
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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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[12] = { .phy = HT, 6500, 0x00, N(0), 4 },
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[13] = { .phy = HT, 13000, 0x00, N(1), 6 },
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[14] = { .phy = HT, 19500, 0x00, N(2), 6 },
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[15] = { .phy = HT, 26000, 0x00, N(3), 8 },
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[16] = { .phy = HT, 39000, 0x00, N(4), 8 },
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[17] = { .phy = HT, 52000, 0x00, N(5), 8 },
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[18] = { .phy = HT, 58500, 0x00, N(6), 8 },
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[19] = { .phy = HT, 65000, 0x00, N(7), 8 },
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[20] = { .phy = HT, 13000, 0x00, N(8), 4 },
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[21] = { .phy = HT, 26000, 0x00, N(9), 6 },
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[22] = { .phy = HT, 39000, 0x00, N(10), 6 },
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[23] = { .phy = HT, 52000, 0x00, N(11), 8 },
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[24] = { .phy = HT, 78000, 0x00, N(12), 8 },
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[25] = { .phy = HT, 104000, 0x00, N(13), 8 },
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[26] = { .phy = HT, 117000, 0x00, N(14), 8 },
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[27] = { .phy = HT, 130000, 0x00, N(15), 8 },
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[28] = { .phy = HT, 19500, 0x00, N(16), 4 },
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[29] = { .phy = HT, 39000, 0x00, N(17), 6 },
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[30] = { .phy = HT, 58500, 0x00, N(18), 6 },
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[31] = { .phy = HT, 78000, 0x00, N(19), 8 },
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[32] = { .phy = HT, 117000, 0x00, N(20), 8 },
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[33] = { .phy = HT, 156000, 0x00, N(21), 8 },
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[34] = { .phy = HT, 175500, 0x00, N(22), 8 },
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[35] = { .phy = HT, 195000, 0x00, N(23), 8 },
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},
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};
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static struct ieee80211_rate_table ieee80211_11na_table = {
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.rateCount = 32,
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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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[8] = { .phy = HT, 6500, 0x00, N(0), 0 },
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[9] = { .phy = HT, 13000, 0x00, N(1), 2 },
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[10] = { .phy = HT, 19500, 0x00, N(2), 2 },
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[11] = { .phy = HT, 26000, 0x00, N(3), 4 },
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[12] = { .phy = HT, 39000, 0x00, N(4), 4 },
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[13] = { .phy = HT, 52000, 0x00, N(5), 4 },
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[14] = { .phy = HT, 58500, 0x00, N(6), 4 },
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[15] = { .phy = HT, 65000, 0x00, N(7), 4 },
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[16] = { .phy = HT, 13000, 0x00, N(8), 0 },
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[17] = { .phy = HT, 26000, 0x00, N(9), 2 },
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[18] = { .phy = HT, 39000, 0x00, N(10), 2 },
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[19] = { .phy = HT, 52000, 0x00, N(11), 4 },
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[20] = { .phy = HT, 78000, 0x00, N(12), 4 },
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[21] = { .phy = HT, 104000, 0x00, N(13), 4 },
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[22] = { .phy = HT, 117000, 0x00, N(14), 4 },
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[23] = { .phy = HT, 130000, 0x00, N(15), 4 },
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[24] = { .phy = HT, 19500, 0x00, N(16), 0 },
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[25] = { .phy = HT, 39000, 0x00, N(17), 2 },
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[26] = { .phy = HT, 58500, 0x00, N(18), 2 },
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[27] = { .phy = HT, 78000, 0x00, N(19), 4 },
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[28] = { .phy = HT, 117000, 0x00, N(20), 4 },
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[29] = { .phy = HT, 156000, 0x00, N(21), 4 },
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[30] = { .phy = HT, 175500, 0x00, N(22), 4 },
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[31] = { .phy = HT, 195000, 0x00, N(23), 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 HALF
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#undef QUART
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#undef CCK
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#undef TURBO
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#undef XR
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#undef HT
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#undef N
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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 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 < nitems(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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/*
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* Map without the basic rate bit.
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*
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* It's up to the caller to ensure that the basic
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* rate bit is stripped here.
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*
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* For HT, use the MCS rate bit.
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*/
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code &= IEEE80211_RATE_VAL;
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if (rt->info[i].phy == IEEE80211_T_HT) {
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code |= IEEE80211_RATE_MCS;
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}
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/* XXX assume the control rate is non-MCS? */
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ctl_rate &= IEEE80211_RATE_VAL;
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rt->rateCodeToIndex[code] = i;
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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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}
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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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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_11na_table,
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&ieee80211_11ng_table,
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&ieee80211_turbog_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 < nitems(ratetables); ++i)
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ieee80211_setup_ratetable(ratetables[i]);
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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_11na_table;
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else if (IEEE80211_IS_CHAN_HTG(c))
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rt = &ieee80211_11ng_table;
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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;
|
|
else if (IEEE80211_IS_CHAN_ANYG(c))
|
|
rt = &ieee80211_11g_table;
|
|
else if (IEEE80211_IS_CHAN_B(c))
|
|
rt = &ieee80211_11b_table;
|
|
else {
|
|
/* NB: should not get here */
|
|
panic("%s: no rate table for channel; freq %u flags 0x%x\n",
|
|
__func__, c->ic_freq, c->ic_flags);
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
/*
|
|
* Convert PLCP signal/rate field to 802.11 rate (.5Mbits/s)
|
|
*
|
|
* Note we do no parameter checking; this routine is mainly
|
|
* used to derive an 802.11 rate for constructing radiotap
|
|
* header data for rx frames.
|
|
*
|
|
* XXX might be a candidate for inline
|
|
*/
|
|
uint8_t
|
|
ieee80211_plcp2rate(uint8_t plcp, enum ieee80211_phytype type)
|
|
{
|
|
if (type == IEEE80211_T_OFDM) {
|
|
static const uint8_t ofdm_plcp2rate[16] = {
|
|
[0xb] = 12,
|
|
[0xf] = 18,
|
|
[0xa] = 24,
|
|
[0xe] = 36,
|
|
[0x9] = 48,
|
|
[0xd] = 72,
|
|
[0x8] = 96,
|
|
[0xc] = 108
|
|
};
|
|
return ofdm_plcp2rate[plcp & 0xf];
|
|
}
|
|
if (type == IEEE80211_T_CCK) {
|
|
static const uint8_t cck_plcp2rate[16] = {
|
|
[0xa] = 2, /* 0x0a */
|
|
[0x4] = 4, /* 0x14 */
|
|
[0x7] = 11, /* 0x37 */
|
|
[0xe] = 22, /* 0x6e */
|
|
[0xc] = 44, /* 0xdc , actually PBCC */
|
|
};
|
|
return cck_plcp2rate[plcp & 0xf];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Covert 802.11 rate to PLCP signal.
|
|
*/
|
|
uint8_t
|
|
ieee80211_rate2plcp(int rate, enum ieee80211_phytype type)
|
|
{
|
|
/* XXX ignore type for now since rates are unique */
|
|
switch (rate) {
|
|
/* OFDM rates (cf IEEE Std 802.11a-1999, pp. 14 Table 80) */
|
|
case 12: return 0xb;
|
|
case 18: return 0xf;
|
|
case 24: return 0xa;
|
|
case 36: return 0xe;
|
|
case 48: return 0x9;
|
|
case 72: return 0xd;
|
|
case 96: return 0x8;
|
|
case 108: return 0xc;
|
|
/* CCK rates (IEEE Std 802.11b-1999 page 15, subclause 18.2.3.3) */
|
|
case 2: return 10;
|
|
case 4: return 20;
|
|
case 11: return 55;
|
|
case 22: return 110;
|
|
/* IEEE Std 802.11g-2003 page 19, subclause 19.3.2.1 */
|
|
case 44: return 220;
|
|
}
|
|
return 0; /* XXX unsupported/unknown rate */
|
|
}
|
|
|
|
#define CCK_SIFS_TIME 10
|
|
#define CCK_PREAMBLE_BITS 144
|
|
#define CCK_PLCP_BITS 48
|
|
|
|
#define OFDM_SIFS_TIME 16
|
|
#define OFDM_PREAMBLE_TIME 20
|
|
#define OFDM_PLCP_BITS 22
|
|
#define OFDM_SYMBOL_TIME 4
|
|
|
|
#define OFDM_HALF_SIFS_TIME 32
|
|
#define OFDM_HALF_PREAMBLE_TIME 40
|
|
#define OFDM_HALF_PLCP_BITS 22
|
|
#define OFDM_HALF_SYMBOL_TIME 8
|
|
|
|
#define OFDM_QUARTER_SIFS_TIME 64
|
|
#define OFDM_QUARTER_PREAMBLE_TIME 80
|
|
#define OFDM_QUARTER_PLCP_BITS 22
|
|
#define OFDM_QUARTER_SYMBOL_TIME 16
|
|
|
|
#define TURBO_SIFS_TIME 8
|
|
#define TURBO_PREAMBLE_TIME 14
|
|
#define TURBO_PLCP_BITS 22
|
|
#define TURBO_SYMBOL_TIME 4
|
|
|
|
/*
|
|
* 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:
|
|
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;
|
|
case IEEE80211_T_OFDM:
|
|
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;
|
|
case IEEE80211_T_OFDM_HALF:
|
|
bitsPerSymbol = (kbps * OFDM_HALF_SYMBOL_TIME) / 1000;
|
|
KASSERT(bitsPerSymbol != 0, ("1/4 rate bps"));
|
|
|
|
numBits = OFDM_PLCP_BITS + (frameLen << 3);
|
|
numSymbols = howmany(numBits, bitsPerSymbol);
|
|
txTime = OFDM_HALF_SIFS_TIME
|
|
+ OFDM_HALF_PREAMBLE_TIME
|
|
+ (numSymbols * OFDM_HALF_SYMBOL_TIME);
|
|
break;
|
|
case IEEE80211_T_OFDM_QUARTER:
|
|
bitsPerSymbol = (kbps * OFDM_QUARTER_SYMBOL_TIME) / 1000;
|
|
KASSERT(bitsPerSymbol != 0, ("1/2 rate bps"));
|
|
|
|
numBits = OFDM_PLCP_BITS + (frameLen << 3);
|
|
numSymbols = howmany(numBits, bitsPerSymbol);
|
|
txTime = OFDM_QUARTER_SIFS_TIME
|
|
+ OFDM_QUARTER_PREAMBLE_TIME
|
|
+ (numSymbols * OFDM_QUARTER_SYMBOL_TIME);
|
|
break;
|
|
case IEEE80211_T_TURBO:
|
|
/* 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;
|
|
default:
|
|
panic("%s: unknown phy %u (rate %u)\n", __func__,
|
|
rt->info[rix].phy, rate);
|
|
}
|
|
return txTime;
|
|
}
|
|
|
|
static const uint16_t ht20_bps[32] = {
|
|
26, 52, 78, 104, 156, 208, 234, 260,
|
|
52, 104, 156, 208, 312, 416, 468, 520,
|
|
78, 156, 234, 312, 468, 624, 702, 780,
|
|
104, 208, 312, 416, 624, 832, 936, 1040
|
|
};
|
|
static const uint16_t ht40_bps[32] = {
|
|
54, 108, 162, 216, 324, 432, 486, 540,
|
|
108, 216, 324, 432, 648, 864, 972, 1080,
|
|
162, 324, 486, 648, 972, 1296, 1458, 1620,
|
|
216, 432, 648, 864, 1296, 1728, 1944, 2160
|
|
};
|
|
|
|
|
|
#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)
|
|
|
|
/*
|
|
* Calculate the transmit duration of an 11n frame.
|
|
*/
|
|
uint32_t
|
|
ieee80211_compute_duration_ht(uint32_t frameLen, uint16_t rate,
|
|
int streams, int isht40, int isShortGI)
|
|
{
|
|
uint32_t bitsPerSymbol, numBits, numSymbols, txTime;
|
|
|
|
KASSERT(rate & IEEE80211_RATE_MCS, ("not mcs %d", rate));
|
|
KASSERT((rate &~ IEEE80211_RATE_MCS) < 31, ("bad mcs 0x%x", rate));
|
|
|
|
if (isht40)
|
|
bitsPerSymbol = ht40_bps[rate & 0x1f];
|
|
else
|
|
bitsPerSymbol = ht20_bps[rate & 0x1f];
|
|
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);
|
|
}
|
|
|
|
#undef HT_LTF
|
|
#undef HT_STF
|
|
#undef HT_SIG
|
|
#undef HT_L_SIG
|
|
#undef HT_L_LTF
|
|
#undef HT_L_STF
|
|
#undef OFDM_PLCP_BITS
|