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Release 4.11 drivers/net/wireless/ath/ath9k/common-beacon.c

/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "common.h"


#define FUDGE 2


static u32 ath9k_get_next_tbtt(struct ath_hw *ah, u64 tsf, unsigned int interval) { unsigned int offset, divisor; tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time); divisor = TU_TO_USEC(interval); div_u64_rem(tsf, divisor, &offset); return (u32) tsf + divisor - offset; }

Contributors

PersonTokensPropCommitsCommitProp
Oleksij Rempel5078.12%150.00%
Janusz Dziedzic1421.88%150.00%
Total64100.00%2100.00%

/* * This sets up the beacon timers according to the timestamp of the last * received beacon and the current TSF, configures PCF and DTIM * handling, programs the sleep registers so the hardware will wakeup in * time to receive beacons, and configures the beacon miss handling so * we'll receive a BMISS interrupt when we stop seeing beacons from the AP * we've associated with. */
int ath9k_cmn_beacon_config_sta(struct ath_hw *ah, struct ath_beacon_config *conf, struct ath9k_beacon_state *bs) { struct ath_common *common = ath9k_hw_common(ah); int dtim_intval; u64 tsf; /* No need to configure beacon if we are not associated */ if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) { ath_dbg(common, BEACON, "STA is not yet associated..skipping beacon config\n"); return -EPERM; } memset(bs, 0, sizeof(*bs)); conf->intval = conf->beacon_interval; /* * Setup dtim parameters according to * last beacon we received (which may be none). */ dtim_intval = conf->intval * conf->dtim_period; /* * Pull nexttbtt forward to reflect the current * TSF and calculate dtim state for the result. */ tsf = ath9k_hw_gettsf64(ah); conf->nexttbtt = ath9k_get_next_tbtt(ah, tsf, conf->intval); bs->bs_intval = TU_TO_USEC(conf->intval); bs->bs_dtimperiod = conf->dtim_period * bs->bs_intval; bs->bs_nexttbtt = conf->nexttbtt; bs->bs_nextdtim = conf->nexttbtt; if (conf->dtim_period > 1) bs->bs_nextdtim = ath9k_get_next_tbtt(ah, tsf, dtim_intval); /* * Calculate the number of consecutive beacons to miss* before taking * a BMISS interrupt. The configuration is specified in TU so we only * need calculate based on the beacon interval. Note that we clamp the * result to at most 15 beacons. */ bs->bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, conf->intval); if (bs->bs_bmissthreshold > 15) bs->bs_bmissthreshold = 15; else if (bs->bs_bmissthreshold <= 0) bs->bs_bmissthreshold = 1; /* * Calculate sleep duration. The configuration is given in ms. * We ensure a multiple of the beacon period is used. Also, if the sleep * duration is greater than the DTIM period then it makes senses * to make it a multiple of that. * * XXX fixed at 100ms */ bs->bs_sleepduration = TU_TO_USEC(roundup(IEEE80211_MS_TO_TU(100), conf->intval)); if (bs->bs_sleepduration > bs->bs_dtimperiod) bs->bs_sleepduration = bs->bs_dtimperiod; /* TSF out of range threshold fixed at 1 second */ bs->bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; ath_dbg(common, BEACON, "bmiss: %u sleep: %u\n", bs->bs_bmissthreshold, bs->bs_sleepduration); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Oleksij Rempel28798.97%150.00%
Sujith Manoharan31.03%150.00%
Total290100.00%2100.00%

EXPORT_SYMBOL(ath9k_cmn_beacon_config_sta);
void ath9k_cmn_beacon_config_adhoc(struct ath_hw *ah, struct ath_beacon_config *conf) { struct ath_common *common = ath9k_hw_common(ah); conf->intval = TU_TO_USEC(conf->beacon_interval); if (conf->ibss_creator) conf->nexttbtt = conf->intval; else conf->nexttbtt = ath9k_get_next_tbtt(ah, ath9k_hw_gettsf64(ah), conf->beacon_interval); if (conf->enable_beacon) ah->imask |= ATH9K_INT_SWBA; else ah->imask &= ~ATH9K_INT_SWBA; ath_dbg(common, BEACON, "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", (conf->enable_beacon) ? "Enable" : "Disable", conf->nexttbtt, conf->intval, conf->beacon_interval); }

Contributors

PersonTokensPropCommitsCommitProp
Oleksij Rempel120100.00%1100.00%
Total120100.00%1100.00%

EXPORT_SYMBOL(ath9k_cmn_beacon_config_adhoc); /* * For multi-bss ap support beacons are either staggered evenly over N slots or * burst together. For the former arrange for the SWBA to be delivered for each * slot. Slots that are not occupied will generate nothing. */
void ath9k_cmn_beacon_config_ap(struct ath_hw *ah, struct ath_beacon_config *conf, unsigned int bc_buf) { struct ath_common *common = ath9k_hw_common(ah); /* NB: the beacon interval is kept internally in TU's */ conf->intval = TU_TO_USEC(conf->beacon_interval); conf->intval /= bc_buf; conf->nexttbtt = ath9k_get_next_tbtt(ah, ath9k_hw_gettsf64(ah), conf->beacon_interval); if (conf->enable_beacon) ah->imask |= ATH9K_INT_SWBA; else ah->imask &= ~ATH9K_INT_SWBA; ath_dbg(common, BEACON, "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", (conf->enable_beacon) ? "Enable" : "Disable", conf->nexttbtt, conf->intval, conf->beacon_interval); }

Contributors

PersonTokensPropCommitsCommitProp
Oleksij Rempel116100.00%1100.00%
Total116100.00%1100.00%

EXPORT_SYMBOL(ath9k_cmn_beacon_config_ap);

Overall Contributors

PersonTokensPropCommitsCommitProp
Oleksij Rempel59897.24%360.00%
Janusz Dziedzic142.28%120.00%
Sujith Manoharan30.49%120.00%
Total615100.00%5100.00%
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