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author | adrian <adrian@FreeBSD.org> | 2013-07-04 21:16:49 +0000 |
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committer | adrian <adrian@FreeBSD.org> | 2013-07-04 21:16:49 +0000 |
commit | 1724725351eecf54f5bef13e26ebaf0bfe28fd50 (patch) | |
tree | 86ccd407ab7baf589b507d268c141171983167c7 /sys/net80211/ieee80211_phy.c | |
parent | 083dd1de651813c2c5b040ffe3cba771aa583df1 (diff) | |
download | FreeBSD-src-1724725351eecf54f5bef13e26ebaf0bfe28fd50.zip FreeBSD-src-1724725351eecf54f5bef13e26ebaf0bfe28fd50.tar.gz |
Implement basic 802.11n awareness in the PHY and AMRR rate control code.
* Add 802.11n 2ghz and 5ghz tables, including legacy rates and up to
MCS23 rates (3x3.)
* Populate the rate code -> rate index lookup table with MCS _and_
normal rates, but _not_ the basic rate flag. Since the basic rate flag
is the same as the MCS flag, we can only use one.
* Introduce some accessor inlines that do PLCP and rate table lookup/access
and enforce that it doesn't set the basic rate bit. They're not
designed for MCS rates, so it will panic.
* Start converting drivers that use the rate table stuff to use the
accessor inlines and strip the basic flag.
* Teach AMRR about basic 11n - it's still as crap for MCS as it is
being used by iwn, so it's not a step _backwardS_.
* Convert iwn over to accept 11n MCS rates rather than 'translate' legacy
to MCS rates. It doesn't use a lookup table any longer; instead it's a
function which takes the current node (for HT parameters) and the
rate code, and returns the hardware PLCP code to use.
Tested:
* ath - it's a no-op, and it works that way
* iwn - both 11n and non-11n
Diffstat (limited to 'sys/net80211/ieee80211_phy.c')
-rw-r--r-- | sys/net80211/ieee80211_phy.c | 193 |
1 files changed, 180 insertions, 13 deletions
diff --git a/sys/net80211/ieee80211_phy.c b/sys/net80211/ieee80211_phy.c index d2ad60d..d1924d8 100644 --- a/sys/net80211/ieee80211_phy.c +++ b/sys/net80211/ieee80211_phy.c @@ -60,8 +60,11 @@ struct ieee80211_ds_plcp_hdr { #define TURBO IEEE80211_T_TURBO #define HALF IEEE80211_T_OFDM_HALF #define QUART IEEE80211_T_OFDM_QUARTER +#define HT IEEE80211_T_HT +/* XXX the 11n and the basic rate flag are unfortunately overlapping. Grr. */ +#define N(r) (IEEE80211_RATE_MCS | r) #define PBCC (IEEE80211_T_OFDM_QUARTER+1) /* XXX */ -#define B(r) (0x80 | r) +#define B(r) (IEEE80211_RATE_BASIC | r) #define Mb(x) (x*1000) static struct ieee80211_rate_table ieee80211_11b_table = { @@ -176,6 +179,98 @@ static struct ieee80211_rate_table ieee80211_turboa_table = { }, }; +static struct ieee80211_rate_table ieee80211_11ng_table = { + .rateCount = 36, + .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 }, + + [12] = { .phy = HT, 6500, 0x00, N(0), 4 }, + [13] = { .phy = HT, 13000, 0x00, N(1), 6 }, + [14] = { .phy = HT, 19500, 0x00, N(2), 6 }, + [15] = { .phy = HT, 26000, 0x00, N(3), 8 }, + [16] = { .phy = HT, 39000, 0x00, N(4), 8 }, + [17] = { .phy = HT, 52000, 0x00, N(5), 8 }, + [18] = { .phy = HT, 58500, 0x00, N(6), 8 }, + [19] = { .phy = HT, 65000, 0x00, N(7), 8 }, + + [20] = { .phy = HT, 13000, 0x00, N(8), 4 }, + [21] = { .phy = HT, 26000, 0x00, N(9), 6 }, + [22] = { .phy = HT, 39000, 0x00, N(10), 6 }, + [23] = { .phy = HT, 52000, 0x00, N(11), 8 }, + [24] = { .phy = HT, 78000, 0x00, N(12), 8 }, + [25] = { .phy = HT, 104000, 0x00, N(13), 8 }, + [26] = { .phy = HT, 117000, 0x00, N(14), 8 }, + [27] = { .phy = HT, 130000, 0x00, N(15), 8 }, + + [28] = { .phy = HT, 19500, 0x00, N(16), 4 }, + [29] = { .phy = HT, 39000, 0x00, N(17), 6 }, + [30] = { .phy = HT, 58500, 0x00, N(18), 6 }, + [31] = { .phy = HT, 78000, 0x00, N(19), 8 }, + [32] = { .phy = HT, 117000, 0x00, N(20), 8 }, + [33] = { .phy = HT, 156000, 0x00, N(21), 8 }, + [34] = { .phy = HT, 175500, 0x00, N(22), 8 }, + [35] = { .phy = HT, 195000, 0x00, N(23), 8 }, + + }, +}; + +static struct ieee80211_rate_table ieee80211_11na_table = { + .rateCount = 32, + .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 }, + + [8] = { .phy = HT, 6500, 0x00, N(0), 0 }, + [9] = { .phy = HT, 13000, 0x00, N(1), 2 }, + [10] = { .phy = HT, 19500, 0x00, N(2), 2 }, + [11] = { .phy = HT, 26000, 0x00, N(3), 4 }, + [12] = { .phy = HT, 39000, 0x00, N(4), 4 }, + [13] = { .phy = HT, 52000, 0x00, N(5), 4 }, + [14] = { .phy = HT, 58500, 0x00, N(6), 4 }, + [15] = { .phy = HT, 65000, 0x00, N(7), 4 }, + + [16] = { .phy = HT, 13000, 0x00, N(8), 0 }, + [17] = { .phy = HT, 26000, 0x00, N(9), 2 }, + [18] = { .phy = HT, 39000, 0x00, N(10), 2 }, + [19] = { .phy = HT, 52000, 0x00, N(11), 4 }, + [20] = { .phy = HT, 78000, 0x00, N(12), 4 }, + [21] = { .phy = HT, 104000, 0x00, N(13), 4 }, + [22] = { .phy = HT, 117000, 0x00, N(14), 4 }, + [23] = { .phy = HT, 130000, 0x00, N(15), 4 }, + + [24] = { .phy = HT, 19500, 0x00, N(16), 0 }, + [25] = { .phy = HT, 39000, 0x00, N(17), 2 }, + [26] = { .phy = HT, 58500, 0x00, N(18), 2 }, + [27] = { .phy = HT, 78000, 0x00, N(19), 4 }, + [28] = { .phy = HT, 117000, 0x00, N(20), 4 }, + [29] = { .phy = HT, 156000, 0x00, N(21), 4 }, + [30] = { .phy = HT, 175500, 0x00, N(22), 4 }, + [31] = { .phy = HT, 195000, 0x00, N(23), 4 }, + + }, +}; + #undef Mb #undef B #undef OFDM @@ -184,6 +279,8 @@ static struct ieee80211_rate_table ieee80211_turboa_table = { #undef CCK #undef TURBO #undef XR +#undef HT +#undef N /* * Setup a rate table's reverse lookup table and fill in @@ -210,15 +307,23 @@ ieee80211_setup_ratetable(struct ieee80211_rate_table *rt) 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; + /* + * Map without the basic rate bit. + * + * It's up to the caller to ensure that the basic + * rate bit is stripped here. + * + * For HT, use the MCS rate bit. + */ + code &= IEEE80211_RATE_VAL; + if (rt->info[i].phy == IEEE80211_T_HT) { + code |= IEEE80211_RATE_MCS; } + /* XXX assume the control rate is non-MCS? */ + ctl_rate &= 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; @@ -247,11 +352,10 @@ ieee80211_phy_init(void) static struct ieee80211_rate_table * const ratetables[] = { &ieee80211_half_table, &ieee80211_quarter_table, - &ieee80211_11a_table, - &ieee80211_11g_table, + &ieee80211_11na_table, + &ieee80211_11ng_table, &ieee80211_turbog_table, &ieee80211_turboa_table, - &ieee80211_turboa_table, &ieee80211_11a_table, &ieee80211_11g_table, &ieee80211_11b_table @@ -276,9 +380,9 @@ ieee80211_get_ratetable(struct ieee80211_channel *c) else if (IEEE80211_IS_CHAN_QUARTER(c)) rt = &ieee80211_quarter_table; else if (IEEE80211_IS_CHAN_HTA(c)) - rt = &ieee80211_11a_table; /* XXX */ + rt = &ieee80211_11na_table; else if (IEEE80211_IS_CHAN_HTG(c)) - rt = &ieee80211_11g_table; /* XXX */ + rt = &ieee80211_11ng_table; else if (IEEE80211_IS_CHAN_108G(c)) rt = &ieee80211_turbog_table; else if (IEEE80211_IS_CHAN_ST(c)) @@ -463,3 +567,66 @@ ieee80211_compute_duration(const struct ieee80211_rate_table *rt, } 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) + +#define HT_RC_2_MCS(_rc) ((_rc) & 0xf) +#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1) +#define IS_HT_RATE(_rc) ( (_rc) & IEEE80211_RATE_MCS) + +/* + * 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 IS_HT_RATE +#undef HT_RC_2_STREAMS +#undef HT_RC_2_MCS +#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 |