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Diffstat (limited to 'sys/dev/ath/ath_rate/sample/sample.h')
| -rw-r--r-- | sys/dev/ath/ath_rate/sample/sample.h | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/sys/dev/ath/ath_rate/sample/sample.h b/sys/dev/ath/ath_rate/sample/sample.h new file mode 100644 index 000000000000..c5a4a23c5c0d --- /dev/null +++ b/sys/dev/ath/ath_rate/sample/sample.h @@ -0,0 +1,286 @@ +/*- + * Copyright (c) 2005 John Bicket + * 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, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any + * redistribution must be conditioned upon including a substantially + * similar Disclaimer requirement for further binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY + * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES. + * + * $FreeBSD$ + */ + +/* + * Defintions for the Atheros Wireless LAN controller driver. + */ +#ifndef _DEV_ATH_RATE_SAMPLE_H +#define _DEV_ATH_RATE_SAMPLE_H + +/* per-device state */ +struct sample_softc { + struct ath_ratectrl arc; /* base state */ + int ath_smoothing_rate; /* ewma percentage (out of 100) */ + int ath_sample_rate; /* send a different bit-rate 1/X packets */ +}; +#define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc) + +struct rate_info { + int rate; + int rix; + int rateCode; + int shortPreambleRateCode; +}; + + +struct rate_stats { + unsigned average_tx_time; + int successive_failures; + int tries; + int total_packets; + int packets_acked; + unsigned perfect_tx_time; /* transmit time for 0 retries */ + int last_tx; +}; + +/* + * for now, we track performance for three different packet + * size buckets + */ +#define NUM_PACKET_SIZE_BINS 3 +static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000}; + +/* per-node state */ +struct sample_node { + int static_rate_ndx; + int num_rates; + + struct rate_info rates[IEEE80211_RATE_MAXSIZE]; + + struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE]; + int last_sample_ndx[NUM_PACKET_SIZE_BINS]; + + int current_sample_ndx[NUM_PACKET_SIZE_BINS]; + int packets_sent[NUM_PACKET_SIZE_BINS]; + + int current_rate[NUM_PACKET_SIZE_BINS]; + int packets_since_switch[NUM_PACKET_SIZE_BINS]; + unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS]; + + int packets_since_sample[NUM_PACKET_SIZE_BINS]; + unsigned sample_tt[NUM_PACKET_SIZE_BINS]; +}; +#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1]) + +#ifndef MIN +#define MIN(a,b) ((a) < (b) ? (a) : (b)) +#endif +#ifndef MAX +#define MAX(a,b) ((a) > (b) ? (a) : (b)) +#endif + +#define WIFI_CW_MIN 31 +#define WIFI_CW_MAX 1023 + +struct ar5212_desc { + /* + * tx_control_0 + */ + u_int32_t frame_len:12; + u_int32_t reserved_12_15:4; + u_int32_t xmit_power:6; + u_int32_t rts_cts_enable:1; + u_int32_t veol:1; + u_int32_t clear_dest_mask:1; + u_int32_t ant_mode_xmit:4; + u_int32_t inter_req:1; + u_int32_t encrypt_key_valid:1; + u_int32_t cts_enable:1; + + /* + * tx_control_1 + */ + u_int32_t buf_len:12; + u_int32_t more:1; + u_int32_t encrypt_key_index:7; + u_int32_t frame_type:4; + u_int32_t no_ack:1; + u_int32_t comp_proc:2; + u_int32_t comp_iv_len:2; + u_int32_t comp_icv_len:2; + u_int32_t reserved_31:1; + + /* + * tx_control_2 + */ + u_int32_t rts_duration:15; + u_int32_t duration_update_enable:1; + u_int32_t xmit_tries0:4; + u_int32_t xmit_tries1:4; + u_int32_t xmit_tries2:4; + u_int32_t xmit_tries3:4; + + /* + * tx_control_3 + */ + u_int32_t xmit_rate0:5; + u_int32_t xmit_rate1:5; + u_int32_t xmit_rate2:5; + u_int32_t xmit_rate3:5; + u_int32_t rts_cts_rate:5; + u_int32_t reserved_25_31:7; + + /* + * tx_status_0 + */ + u_int32_t frame_xmit_ok:1; + u_int32_t excessive_retries:1; + u_int32_t fifo_underrun:1; + u_int32_t filtered:1; + u_int32_t rts_fail_count:4; + u_int32_t data_fail_count:4; + u_int32_t virt_coll_count:4; + u_int32_t send_timestamp:16; + + /* + * tx_status_1 + */ + u_int32_t done:1; + u_int32_t seq_num:12; + u_int32_t ack_sig_strength:8; + u_int32_t final_ts_index:2; + u_int32_t comp_success:1; + u_int32_t xmit_antenna:1; + u_int32_t reserved_25_31_x:7; +} __packed; + +/* + * Calculate the transmit duration of a frame. + */ +static unsigned calc_usecs_unicast_packet(struct ath_softc *sc, + int length, + int rix, int short_retries, int long_retries) { + const HAL_RATE_TABLE *rt = sc->sc_currates; + int rts, cts; + + unsigned t_slot = 20; + unsigned t_difs = 50; + unsigned t_sifs = 10; + struct ieee80211com *ic = &sc->sc_ic; + int tt = 0; + int x = 0; + int cw = WIFI_CW_MIN; + int cix = rt->info[rix].controlRate; + + KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); + + if (!rt->info[rix].rateKbps) { + printf("rix %d (%d) bad ratekbps %d mode %u\n", + rix, rt->info[rix].dot11Rate, + rt->info[rix].rateKbps, + sc->sc_curmode); + + return 0; + } + /* + * XXX getting mac/phy level timings should be fixed for turbo + * rates, and there is probably a way to get this from the + * hal... + */ + switch (rt->info[rix].phy) { + case IEEE80211_T_OFDM: + t_slot = 9; + t_sifs = 16; + t_difs = 28; + /* fall through */ + case IEEE80211_T_TURBO: + t_slot = 9; + t_sifs = 8; + t_difs = 28; + break; + case IEEE80211_T_DS: + /* fall through to default */ + default: + /* pg 205 ieee.802.11.pdf */ + t_slot = 20; + t_difs = 50; + t_sifs = 10; + } + + rts = cts = 0; + + if ((ic->ic_flags & IEEE80211_F_USEPROT) && + rt->info[rix].phy == IEEE80211_T_OFDM) { + if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) + rts = 1; + else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) + cts = 1; + + cix = rt->info[sc->sc_protrix].controlRate; + + } + + if (0 /*length > ic->ic_rtsthreshold */) { + rts = 1; + } + + if (rts || cts) { + int ctsrate = rt->info[cix].rateCode; + int ctsduration = 0; + + if (!rt->info[cix].rateKbps) { + printf("cix %d (%d) bad ratekbps %d mode %u\n", + cix, rt->info[cix].dot11Rate, + rt->info[cix].rateKbps, + sc->sc_curmode); + return 0; + } + + ctsrate |= rt->info[cix].shortPreamble; + if (rts) /* SIFS + CTS */ + ctsduration += rt->info[cix].spAckDuration; + + ctsduration += ath_hal_computetxtime(sc->sc_ah, + rt, length, rix, AH_TRUE); + + if (cts) /* SIFS + ACK */ + ctsduration += rt->info[cix].spAckDuration; + + tt += (short_retries + 1) * ctsduration; + } + tt += t_difs; + tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration); + tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length, + rix, AH_TRUE); + for (x = 0; x <= short_retries + long_retries; x++) { + cw = MIN(WIFI_CW_MAX, (cw + 1) * 2); + tt += (t_slot * cw/2); + } + return tt; +} +#endif /* _DEV_ATH_RATE_SAMPLE_H */ |