/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting * 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. * * 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. */ #include __FBSDID("$FreeBSD$"); /* * Driver for the Atheros Wireless LAN controller. * * This software is derived from work of Atsushi Onoe; his contribution * is greatly appreciated. */ #include "opt_inet.h" #include "opt_ath.h" /* * This is needed for register operations which are performed * by the driver - eg, calls to ath_hal_gettsf32(). * * It's also required for any AH_DEBUG checks in here, eg the * module dependencies. */ #include "opt_ah.h" #include "opt_wlan.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for mp_ncpus */ #include #include #include #include #include #include #include #include #include #include #include #ifdef IEEE80211_SUPPORT_SUPERG #include #endif #include #ifdef INET #include #include #endif #include #include #include #include #include #ifdef ATH_TX99_DIAG #include #endif /* * Setup a h/w transmit queue for beacons. */ int ath_beaconq_setup(struct ath_softc *sc) { struct ath_hal *ah = sc->sc_ah; HAL_TXQ_INFO qi; memset(&qi, 0, sizeof(qi)); qi.tqi_aifs = HAL_TXQ_USEDEFAULT; qi.tqi_cwmin = HAL_TXQ_USEDEFAULT; qi.tqi_cwmax = HAL_TXQ_USEDEFAULT; /* NB: for dynamic turbo, don't enable any other interrupts */ qi.tqi_qflags = HAL_TXQ_TXDESCINT_ENABLE; if (sc->sc_isedma) qi.tqi_qflags |= HAL_TXQ_TXOKINT_ENABLE | HAL_TXQ_TXERRINT_ENABLE; return ath_hal_setuptxqueue(ah, HAL_TX_QUEUE_BEACON, &qi); } /* * Setup the transmit queue parameters for the beacon queue. */ int ath_beaconq_config(struct ath_softc *sc) { #define ATH_EXPONENT_TO_VALUE(v) ((1<<(v))-1) struct ieee80211com *ic = &sc->sc_ic; struct ath_hal *ah = sc->sc_ah; HAL_TXQ_INFO qi; ath_hal_gettxqueueprops(ah, sc->sc_bhalq, &qi); if (ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_MBSS) { /* * Always burst out beacon and CAB traffic. */ qi.tqi_aifs = ATH_BEACON_AIFS_DEFAULT; qi.tqi_cwmin = ATH_BEACON_CWMIN_DEFAULT; qi.tqi_cwmax = ATH_BEACON_CWMAX_DEFAULT; } else { struct chanAccParams chp; struct wmeParams *wmep; ieee80211_wme_ic_getparams(ic, &chp); wmep = &chp.cap_wmeParams[WME_AC_BE]; /* * Adhoc mode; important thing is to use 2x cwmin. */ qi.tqi_aifs = wmep->wmep_aifsn; qi.tqi_cwmin = 2*ATH_EXPONENT_TO_VALUE(wmep->wmep_logcwmin); qi.tqi_cwmax = ATH_EXPONENT_TO_VALUE(wmep->wmep_logcwmax); } if (!ath_hal_settxqueueprops(ah, sc->sc_bhalq, &qi)) { device_printf(sc->sc_dev, "unable to update parameters for " "beacon hardware queue!\n"); return 0; } else { ath_hal_resettxqueue(ah, sc->sc_bhalq); /* push to h/w */ return 1; } #undef ATH_EXPONENT_TO_VALUE } /* * Allocate and setup an initial beacon frame. */ int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_node *ni) { struct ieee80211vap *vap = ni->ni_vap; struct ath_vap *avp = ATH_VAP(vap); struct ath_buf *bf; struct mbuf *m; int error; bf = avp->av_bcbuf; DPRINTF(sc, ATH_DEBUG_NODE, "%s: bf_m=%p, bf_node=%p\n", __func__, bf->bf_m, bf->bf_node); if (bf->bf_m != NULL) { bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); m_freem(bf->bf_m); bf->bf_m = NULL; } if (bf->bf_node != NULL) { ieee80211_free_node(bf->bf_node); bf->bf_node = NULL; } /* * NB: the beacon data buffer must be 32-bit aligned; * we assume the mbuf routines will return us something * with this alignment (perhaps should assert). */ m = ieee80211_beacon_alloc(ni); if (m == NULL) { device_printf(sc->sc_dev, "%s: cannot get mbuf\n", __func__); sc->sc_stats.ast_be_nombuf++; return ENOMEM; } error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m, bf->bf_segs, &bf->bf_nseg, BUS_DMA_NOWAIT); if (error != 0) { device_printf(sc->sc_dev, "%s: cannot map mbuf, bus_dmamap_load_mbuf_sg returns %d\n", __func__, error); m_freem(m); return error; } /* * Calculate a TSF adjustment factor required for staggered * beacons. Note that we assume the format of the beacon * frame leaves the tstamp field immediately following the * header. */ if (sc->sc_stagbeacons && avp->av_bslot > 0) { uint64_t tsfadjust; struct ieee80211_frame *wh; /* * The beacon interval is in TU's; the TSF is in usecs. * We figure out how many TU's to add to align the timestamp * then convert to TSF units and handle byte swapping before * inserting it in the frame. The hardware will then add this * each time a beacon frame is sent. Note that we align vap's * 1..N and leave vap 0 untouched. This means vap 0 has a * timestamp in one beacon interval while the others get a * timstamp aligned to the next interval. */ tsfadjust = ni->ni_intval * (ATH_BCBUF - avp->av_bslot) / ATH_BCBUF; tsfadjust = htole64(tsfadjust << 10); /* TU -> TSF */ DPRINTF(sc, ATH_DEBUG_BEACON, "%s: %s beacons bslot %d intval %u tsfadjust %llu\n", __func__, sc->sc_stagbeacons ? "stagger" : "burst", avp->av_bslot, ni->ni_intval, (long long unsigned) le64toh(tsfadjust)); wh = mtod(m, struct ieee80211_frame *); memcpy(&wh[1], &tsfadjust, sizeof(tsfadjust)); } bf->bf_m = m; bf->bf_node = ieee80211_ref_node(ni); return 0; } /* * Setup the beacon frame for transmit. */ static void ath_beacon_setup(struct ath_softc *sc, struct ath_buf *bf) { #define USE_SHPREAMBLE(_ic) \ (((_ic)->ic_flags & (IEEE80211_F_SHPREAMBLE | IEEE80211_F_USEBARKER))\ == IEEE80211_F_SHPREAMBLE) struct ieee80211_node *ni = bf->bf_node; struct ieee80211com *ic = ni->ni_ic; struct mbuf *m = bf->bf_m; struct ath_hal *ah = sc->sc_ah; struct ath_desc *ds; int flags, antenna; const HAL_RATE_TABLE *rt; u_int8_t rix, rate; HAL_DMA_ADDR bufAddrList[4]; uint32_t segLenList[4]; HAL_11N_RATE_SERIES rc[4]; DPRINTF(sc, ATH_DEBUG_BEACON_PROC, "%s: m %p len %u\n", __func__, m, m->m_len); /* setup descriptors */ ds = bf->bf_desc; bf->bf_last = bf; bf->bf_lastds = ds; flags = HAL_TXDESC_NOACK; if (ic->ic_opmode == IEEE80211_M_IBSS && sc->sc_hasveol) { /* self-linked descriptor */ ath_hal_settxdesclink(sc->sc_ah, ds, bf->bf_daddr); flags |= HAL_TXDESC_VEOL; /* * Let hardware handle antenna switching. */ antenna = sc->sc_txantenna; } else { ath_hal_settxdesclink(sc->sc_ah, ds, 0); /* * Switch antenna every 4 beacons. * XXX assumes two antenna */ if (sc->sc_txantenna != 0) antenna = sc->sc_txantenna; else if (sc->sc_stagbeacons && sc->sc_nbcnvaps != 0) antenna = ((sc->sc_stats.ast_be_xmit / sc->sc_nbcnvaps) & 4 ? 2 : 1); else antenna = (sc->sc_stats.ast_be_xmit & 4 ? 2 : 1); } KASSERT(bf->bf_nseg == 1, ("multi-segment beacon frame; nseg %u", bf->bf_nseg)); /* * Calculate rate code. * XXX everything at min xmit rate */ rix = 0; rt = sc->sc_currates; rate = rt->info[rix].rateCode; if (USE_SHPREAMBLE(ic)) rate |= rt->info[rix].shortPreamble; ath_hal_setuptxdesc(ah, ds , m->m_len + IEEE80211_CRC_LEN /* frame length */ , sizeof(struct ieee80211_frame)/* header length */ , HAL_PKT_TYPE_BEACON /* Atheros packet type */ , ieee80211_get_node_txpower(ni) /* txpower XXX */ , rate, 1 /* series 0 rate/tries */ , HAL_TXKEYIX_INVALID /* no encryption */ , antenna /* antenna mode */ , flags /* no ack, veol for beacons */ , 0 /* rts/cts rate */ , 0 /* rts/cts duration */ ); /* * The EDMA HAL currently assumes that _all_ rate control * settings are done in ath_hal_set11nratescenario(), rather * than in ath_hal_setuptxdesc(). */ if (sc->sc_isedma) { memset(&rc, 0, sizeof(rc)); rc[0].ChSel = sc->sc_txchainmask; rc[0].Tries = 1; rc[0].Rate = rt->info[rix].rateCode; rc[0].RateIndex = rix; rc[0].tx_power_cap = 0x3f; rc[0].PktDuration = ath_hal_computetxtime(ah, rt, roundup(m->m_len, 4), rix, 0, AH_TRUE); ath_hal_set11nratescenario(ah, ds, 0, 0, rc, 4, flags); } /* NB: beacon's BufLen must be a multiple of 4 bytes */ segLenList[0] = roundup(m->m_len, 4); segLenList[1] = segLenList[2] = segLenList[3] = 0; bufAddrList[0] = bf->bf_segs[0].ds_addr; bufAddrList[1] = bufAddrList[2] = bufAddrList[3] = 0; ath_hal_filltxdesc(ah, ds , bufAddrList , segLenList , 0 /* XXX desc id */ , sc->sc_bhalq /* hardware TXQ */ , AH_TRUE /* first segment */ , AH_TRUE /* last segment */ , ds /* first descriptor */ ); #if 0 ath_desc_swap(ds); #endif #undef USE_SHPREAMBLE } void ath_beacon_update(struct ieee80211vap *vap, int item) { struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; setbit(bo->bo_flags, item); } /* * Handle a beacon miss. */ void ath_beacon_miss(struct ath_softc *sc) { HAL_SURVEY_SAMPLE hs; HAL_BOOL ret; uint32_t hangs; bzero(&hs, sizeof(hs)); ret = ath_hal_get_mib_cycle_counts(sc->sc_ah, &hs); if (ath_hal_gethangstate(sc->sc_ah, 0xffff, &hangs) && hangs != 0) { DPRINTF(sc, ATH_DEBUG_BEACON, "%s: hang=0x%08x\n", __func__, hangs); } #ifdef ATH_DEBUG_ALQ if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_MISSED_BEACON)) if_ath_alq_post(&sc->sc_alq, ATH_ALQ_MISSED_BEACON, 0, NULL); #endif DPRINTF(sc, ATH_DEBUG_BEACON, "%s: valid=%d, txbusy=%u, rxbusy=%u, chanbusy=%u, " "extchanbusy=%u, cyclecount=%u\n", __func__, ret, hs.tx_busy, hs.rx_busy, hs.chan_busy, hs.ext_chan_busy, hs.cycle_count); } /* * Transmit a beacon frame at SWBA. Dynamic updates to the * frame contents are done as needed and the slot time is * also adjusted based on current state. */ void ath_beacon_proc(void *arg, int pending) { struct ath_softc *sc = arg; struct ath_hal *ah = sc->sc_ah; struct ieee80211vap *vap; struct ath_buf *bf; int slot, otherant; uint32_t bfaddr; DPRINTF(sc, ATH_DEBUG_BEACON_PROC, "%s: pending %u\n", __func__, pending); /* * Check if the previous beacon has gone out. If * not don't try to post another, skip this period * and wait for the next. Missed beacons indicate * a problem and should not occur. If we miss too * many consecutive beacons reset the device. */ if (ath_hal_numtxpending(ah, sc->sc_bhalq) != 0) { sc->sc_bmisscount++; sc->sc_stats.ast_be_missed++; ath_beacon_miss(sc); DPRINTF(sc, ATH_DEBUG_BEACON, "%s: missed %u consecutive beacons\n", __func__, sc->sc_bmisscount); if (sc->sc_bmisscount >= ath_bstuck_threshold) taskqueue_enqueue(sc->sc_tq, &sc->sc_bstucktask); return; } if (sc->sc_bmisscount != 0) { DPRINTF(sc, ATH_DEBUG_BEACON, "%s: resume beacon xmit after %u misses\n", __func__, sc->sc_bmisscount); sc->sc_bmisscount = 0; #ifdef ATH_DEBUG_ALQ if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_RESUME_BEACON)) if_ath_alq_post(&sc->sc_alq, ATH_ALQ_RESUME_BEACON, 0, NULL); #endif } if (sc->sc_stagbeacons) { /* staggered beacons */ struct ieee80211com *ic = &sc->sc_ic; uint32_t tsftu; tsftu = ath_hal_gettsf32(ah) >> 10; /* XXX lintval */ slot = ((tsftu % ic->ic_lintval) * ATH_BCBUF) / ic->ic_lintval; vap = sc->sc_bslot[(slot+1) % ATH_BCBUF]; bfaddr = 0; if (vap != NULL && vap->iv_state >= IEEE80211_S_RUN) { bf = ath_beacon_generate(sc, vap); if (bf != NULL) bfaddr = bf->bf_daddr; } } else { /* burst'd beacons */ uint32_t *bflink = &bfaddr; for (slot = 0; slot < ATH_BCBUF; slot++) { vap = sc->sc_bslot[slot]; if (vap != NULL && vap->iv_state >= IEEE80211_S_RUN) { bf = ath_beacon_generate(sc, vap); /* * XXX TODO: this should use settxdesclinkptr() * otherwise it won't work for EDMA chipsets! */ if (bf != NULL) { /* XXX should do this using the ds */ *bflink = bf->bf_daddr; ath_hal_gettxdesclinkptr(sc->sc_ah, bf->bf_desc, &bflink); } } } /* * XXX TODO: this should use settxdesclinkptr() * otherwise it won't work for EDMA chipsets! */ *bflink = 0; /* terminate list */ } /* * Handle slot time change when a non-ERP station joins/leaves * an 11g network. The 802.11 layer notifies us via callback, * we mark updateslot, then wait one beacon before effecting * the change. This gives associated stations at least one * beacon interval to note the state change. */ /* XXX locking */ if (sc->sc_updateslot == UPDATE) { sc->sc_updateslot = COMMIT; /* commit next beacon */ sc->sc_slotupdate = slot; } else if (sc->sc_updateslot == COMMIT && sc->sc_slotupdate == slot) ath_setslottime(sc); /* commit change to h/w */ /* * Check recent per-antenna transmit statistics and flip * the default antenna if noticeably more frames went out * on the non-default antenna. * XXX assumes 2 anntenae */ if (!sc->sc_diversity && (!sc->sc_stagbeacons || slot == 0)) { otherant = sc->sc_defant & 1 ? 2 : 1; if (sc->sc_ant_tx[otherant] > sc->sc_ant_tx[sc->sc_defant] + 2) ath_setdefantenna(sc, otherant); sc->sc_ant_tx[1] = sc->sc_ant_tx[2] = 0; } /* Program the CABQ with the contents of the CABQ txq and start it */ ATH_TXQ_LOCK(sc->sc_cabq); ath_beacon_cabq_start(sc); ATH_TXQ_UNLOCK(sc->sc_cabq); /* Program the new beacon frame if we have one for this interval */ if (bfaddr != 0) { /* * Stop any current dma and put the new frame on the queue. * This should never fail since we check above that no frames * are still pending on the queue. */ if (! sc->sc_isedma) { if (!ath_hal_stoptxdma(ah, sc->sc_bhalq)) { DPRINTF(sc, ATH_DEBUG_ANY, "%s: beacon queue %u did not stop?\n", __func__, sc->sc_bhalq); } } /* NB: cabq traffic should already be queued and primed */ ath_hal_puttxbuf(ah, sc->sc_bhalq, bfaddr); ath_hal_txstart(ah, sc->sc_bhalq); sc->sc_stats.ast_be_xmit++; } } static void ath_beacon_cabq_start_edma(struct ath_softc *sc) { struct ath_buf *bf, *bf_last; struct ath_txq *cabq = sc->sc_cabq; #if 0 struct ath_buf *bfi; int i = 0; #endif ATH_TXQ_LOCK_ASSERT(cabq); if (TAILQ_EMPTY(&cabq->axq_q)) return; bf = TAILQ_FIRST(&cabq->axq_q); bf_last = TAILQ_LAST(&cabq->axq_q, axq_q_s); /* * This is a dirty, dirty hack to push the contents of * the cabq staging queue into the FIFO. * * This ideally should live in the EDMA code file * and only push things into the CABQ if there's a FIFO * slot. * * We can't treat this like a normal TX queue because * in the case of multi-VAP traffic, we may have to flush * the CABQ each new (staggered) beacon that goes out. * But for non-staggered beacons, we could in theory * handle multicast traffic for all VAPs in one FIFO * push. Just keep all of this in mind if you're wondering * how to correctly/better handle multi-VAP CABQ traffic * with EDMA. */ /* * Is the CABQ FIFO free? If not, complain loudly and * don't queue anything. Maybe we'll flush the CABQ * traffic, maybe we won't. But that'll happen next * beacon interval. */ if (cabq->axq_fifo_depth >= HAL_TXFIFO_DEPTH) { device_printf(sc->sc_dev, "%s: Q%d: CAB FIFO queue=%d?\n", __func__, cabq->axq_qnum, cabq->axq_fifo_depth); return; } /* * Ok, so here's the gymnastics reqiured to make this * all sensible. */ /* * Tag the first/last buffer appropriately. */ bf->bf_flags |= ATH_BUF_FIFOPTR; bf_last->bf_flags |= ATH_BUF_FIFOEND; #if 0 i = 0; TAILQ_FOREACH(bfi, &cabq->axq_q, bf_list) { ath_printtxbuf(sc, bf, cabq->axq_qnum, i, 0); i++; } #endif /* * We now need to push this set of frames onto the tail * of the FIFO queue. We don't adjust the aggregate * count, only the queue depth counter(s). * We also need to blank the link pointer now. */ TAILQ_CONCAT(&cabq->fifo.axq_q, &cabq->axq_q, bf_list); cabq->axq_link = NULL; cabq->fifo.axq_depth += cabq->axq_depth; cabq->axq_depth = 0; /* Bump FIFO queue */ cabq->axq_fifo_depth++; /* Push the first entry into the hardware */ ath_hal_puttxbuf(sc->sc_ah, cabq->axq_qnum, bf->bf_daddr); cabq->axq_flags |= ATH_TXQ_PUTRUNNING; /* NB: gated by beacon so safe to start here */ ath_hal_txstart(sc->sc_ah, cabq->axq_qnum); } static void ath_beacon_cabq_start_legacy(struct ath_softc *sc) { struct ath_buf *bf; struct ath_txq *cabq = sc->sc_cabq; ATH_TXQ_LOCK_ASSERT(cabq); if (TAILQ_EMPTY(&cabq->axq_q)) return; bf = TAILQ_FIRST(&cabq->axq_q); /* Push the first entry into the hardware */ ath_hal_puttxbuf(sc->sc_ah, cabq->axq_qnum, bf->bf_daddr); cabq->axq_flags |= ATH_TXQ_PUTRUNNING; /* NB: gated by beacon so safe to start here */ ath_hal_txstart(sc->sc_ah, cabq->axq_qnum); } /* * Start CABQ transmission - this assumes that all frames are prepped * and ready in the CABQ. */ void ath_beacon_cabq_start(struct ath_softc *sc) { struct ath_txq *cabq = sc->sc_cabq; ATH_TXQ_LOCK_ASSERT(cabq); if (TAILQ_EMPTY(&cabq->axq_q)) return; if (sc->sc_isedma) ath_beacon_cabq_start_edma(sc); else ath_beacon_cabq_start_legacy(sc); } struct ath_buf * ath_beacon_generate(struct ath_softc *sc, struct ieee80211vap *vap) { struct ath_vap *avp = ATH_VAP(vap); struct ath_txq *cabq = sc->sc_cabq; struct ath_buf *bf; struct mbuf *m; int nmcastq, error; KASSERT(vap->iv_state >= IEEE80211_S_RUN, ("not running, state %d", vap->iv_state)); KASSERT(avp->av_bcbuf != NULL, ("no beacon buffer")); /* * Update dynamic beacon contents. If this returns * non-zero then we need to remap the memory because * the beacon frame changed size (probably because * of the TIM bitmap). */ bf = avp->av_bcbuf; m = bf->bf_m; /* XXX lock mcastq? */ nmcastq = avp->av_mcastq.axq_depth; if (ieee80211_beacon_update(bf->bf_node, m, nmcastq)) { /* XXX too conservative? */ bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m, bf->bf_segs, &bf->bf_nseg, BUS_DMA_NOWAIT); if (error != 0) { if_printf(vap->iv_ifp, "%s: bus_dmamap_load_mbuf_sg failed, error %u\n", __func__, error); return NULL; } } if ((vap->iv_bcn_off.bo_tim[4] & 1) && cabq->axq_depth) { DPRINTF(sc, ATH_DEBUG_BEACON, "%s: cabq did not drain, mcastq %u cabq %u\n", __func__, nmcastq, cabq->axq_depth); sc->sc_stats.ast_cabq_busy++; if (sc->sc_nvaps > 1 && sc->sc_stagbeacons) { /* * CABQ traffic from a previous vap is still pending. * We must drain the q before this beacon frame goes * out as otherwise this vap's stations will get cab * frames from a different vap. * XXX could be slow causing us to miss DBA */ /* * XXX TODO: this doesn't stop CABQ DMA - it assumes * that since we're about to transmit a beacon, we've * already stopped transmitting on the CABQ. But this * doesn't at all mean that the CABQ DMA QCU will * accept a new TXDP! So what, should we do a DMA * stop? What if it fails? * * More thought is required here. */ /* * XXX can we even stop TX DMA here? Check what the * reference driver does for cabq for beacons, given * that stopping TX requires RX is paused. */ ath_tx_draintxq(sc, cabq); } } ath_beacon_setup(sc, bf); bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE); /* * XXX TODO: tie into net80211 for quiet time IE update and program * local AP timer if we require it. The process of updating the * beacon will also update the IE with the relevant counters. */ /* * Enable the CAB queue before the beacon queue to * insure cab frames are triggered by this beacon. */ if (vap->iv_bcn_off.bo_tim[4] & 1) { /* NB: only at DTIM */ ATH_TXQ_LOCK(&avp->av_mcastq); if (nmcastq) { struct ath_buf *bfm, *bfc_last; /* * Move frames from the s/w mcast q to the h/w cab q. * * XXX TODO: if we chain together multiple VAPs * worth of CABQ traffic, should we keep the * MORE data bit set on the last frame of each * intermediary VAP (ie, only clear the MORE * bit of the last frame on the last vap?) */ bfm = TAILQ_FIRST(&avp->av_mcastq.axq_q); ATH_TXQ_LOCK(cabq); /* * If there's already a frame on the CABQ, we * need to link to the end of the last frame. * We can't use axq_link here because * EDMA descriptors require some recalculation * (checksum) to occur. */ bfc_last = ATH_TXQ_LAST(cabq, axq_q_s); if (bfc_last != NULL) { ath_hal_settxdesclink(sc->sc_ah, bfc_last->bf_lastds, bfm->bf_daddr); } ath_txqmove(cabq, &avp->av_mcastq); ATH_TXQ_UNLOCK(cabq); /* * XXX not entirely accurate, in case a mcast * queue frame arrived before we grabbed the TX * lock. */ sc->sc_stats.ast_cabq_xmit += nmcastq; } ATH_TXQ_UNLOCK(&avp->av_mcastq); } return bf; } void ath_beacon_start_adhoc(struct ath_softc *sc, struct ieee80211vap *vap) { struct ath_vap *avp = ATH_VAP(vap); struct ath_hal *ah = sc->sc_ah; struct ath_buf *bf; struct mbuf *m; int error; KASSERT(avp->av_bcbuf != NULL, ("no beacon buffer")); /* * Update dynamic beacon contents. If this returns * non-zero then we need to remap the memory because * the beacon frame changed size (probably because * of the TIM bitmap). */ bf = avp->av_bcbuf; m = bf->bf_m; if (ieee80211_beacon_update(bf->bf_node, m, 0)) { /* XXX too conservative? */ bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m, bf->bf_segs, &bf->bf_nseg, BUS_DMA_NOWAIT); if (error != 0) { if_printf(vap->iv_ifp, "%s: bus_dmamap_load_mbuf_sg failed, error %u\n", __func__, error); return; } } ath_beacon_setup(sc, bf); bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE); /* NB: caller is known to have already stopped tx dma */ ath_hal_puttxbuf(ah, sc->sc_bhalq, bf->bf_daddr); ath_hal_txstart(ah, sc->sc_bhalq); } /* * Reclaim beacon resources and return buffer to the pool. */ void ath_beacon_return(struct ath_softc *sc, struct ath_buf *bf) { DPRINTF(sc, ATH_DEBUG_NODE, "%s: free bf=%p, bf_m=%p, bf_node=%p\n", __func__, bf, bf->bf_m, bf->bf_node); if (bf->bf_m != NULL) { bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); m_freem(bf->bf_m); bf->bf_m = NULL; } if (bf->bf_node != NULL) { ieee80211_free_node(bf->bf_node); bf->bf_node = NULL; } TAILQ_INSERT_TAIL(&sc->sc_bbuf, bf, bf_list); } /* * Reclaim beacon resources. */ void ath_beacon_free(struct ath_softc *sc) { struct ath_buf *bf; TAILQ_FOREACH(bf, &sc->sc_bbuf, bf_list) { DPRINTF(sc, ATH_DEBUG_NODE, "%s: free bf=%p, bf_m=%p, bf_node=%p\n", __func__, bf, bf->bf_m, bf->bf_node); if (bf->bf_m != NULL) { bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); m_freem(bf->bf_m); bf->bf_m = NULL; } if (bf->bf_node != NULL) { ieee80211_free_node(bf->bf_node); bf->bf_node = NULL; } } } /* * Configure the beacon and sleep timers. * * When operating as an AP this resets the TSF and sets * up the hardware to notify us when we need to issue beacons. * * When operating in station mode 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. */ void ath_beacon_config(struct ath_softc *sc, struct ieee80211vap *vap) { #define TSF_TO_TU(_h,_l) \ ((((u_int32_t)(_h)) << 22) | (((u_int32_t)(_l)) >> 10)) #define FUDGE 2 struct ath_hal *ah = sc->sc_ah; struct ath_vap *avp; struct ieee80211com *ic = &sc->sc_ic; struct ieee80211_node *ni; u_int32_t nexttbtt, intval, tsftu; u_int32_t nexttbtt_u8, intval_u8; u_int64_t tsf, tsf_beacon; if (vap == NULL) vap = TAILQ_FIRST(&ic->ic_vaps); /* XXX */ /* * Just ensure that we aren't being called when the last * VAP is destroyed. */ if (vap == NULL) { device_printf(sc->sc_dev, "%s: called with no VAPs\n", __func__); return; } /* Now that we have a vap, we can do this bit */ avp = ATH_VAP(vap); ni = ieee80211_ref_node(vap->iv_bss); ATH_LOCK(sc); ath_power_set_power_state(sc, HAL_PM_AWAKE); ATH_UNLOCK(sc); /* Always clear the quiet IE timers; let the next update program them */ ath_hal_set_quiet(ah, 0, 0, 0, HAL_QUIET_DISABLE); memset(&avp->quiet_ie, 0, sizeof(avp->quiet_ie)); /* extract tstamp from last beacon and convert to TU */ nexttbtt = TSF_TO_TU(le32dec(ni->ni_tstamp.data + 4), le32dec(ni->ni_tstamp.data)); tsf_beacon = ((uint64_t) le32dec(ni->ni_tstamp.data + 4)) << 32; tsf_beacon |= le32dec(ni->ni_tstamp.data); if (ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_MBSS) { /* * For multi-bss ap/mesh 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. */ /* NB: the beacon interval is kept internally in TU's */ intval = ni->ni_intval & HAL_BEACON_PERIOD; if (sc->sc_stagbeacons) intval /= ATH_BCBUF; } else { /* NB: the beacon interval is kept internally in TU's */ intval = ni->ni_intval & HAL_BEACON_PERIOD; } /* * Note: rounding up to the next intval can cause problems with * bad APs when we're in powersave mode. * * In STA mode with powersave enabled, beacons are only received * whenever the beacon timer fires to wake up the hardware. * Now, if this is rounded up to the next intval, it assumes * that the AP has started transmitting beacons at TSF values that * are multiples of intval, versus say being 25 TU off. * * The specification (802.11-2012 10.1.3.2 - Beacon Generation in * Infrastructure Networks) requires APs be beaconing at a * mutiple of intval. So, if bintval=100, then we shouldn't * get beacons at intervals other than around multiples of 100. */ if (nexttbtt == 0) /* e.g. for ap mode */ nexttbtt = intval; else nexttbtt = roundup(nexttbtt, intval); DPRINTF(sc, ATH_DEBUG_BEACON, "%s: nexttbtt %u intval %u (%u)\n", __func__, nexttbtt, intval, ni->ni_intval); if (ic->ic_opmode == IEEE80211_M_STA && !sc->sc_swbmiss) { HAL_BEACON_STATE bs; int dtimperiod, dtimcount; int cfpperiod, cfpcount; /* * Setup dtim and cfp parameters according to * last beacon we received (which may be none). */ dtimperiod = ni->ni_dtim_period; if (dtimperiod <= 0) /* NB: 0 if not known */ dtimperiod = 1; dtimcount = ni->ni_dtim_count; if (dtimcount >= dtimperiod) /* NB: sanity check */ dtimcount = 0; /* XXX? */ cfpperiod = 1; /* NB: no PCF support yet */ cfpcount = 0; /* * Pull nexttbtt forward to reflect the current * TSF and calculate dtim+cfp state for the result. */ tsf = ath_hal_gettsf64(ah); tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; DPRINTF(sc, ATH_DEBUG_BEACON, "%s: beacon tsf=%llu, hw tsf=%llu, nexttbtt=%u, tsftu=%u\n", __func__, (unsigned long long) tsf_beacon, (unsigned long long) tsf, nexttbtt, tsftu); DPRINTF(sc, ATH_DEBUG_BEACON, "%s: beacon tsf=%llu, hw tsf=%llu, tsf delta=%lld\n", __func__, (unsigned long long) tsf_beacon, (unsigned long long) tsf, (long long) tsf - (long long) tsf_beacon); DPRINTF(sc, ATH_DEBUG_BEACON, "%s: nexttbtt=%llu, beacon tsf delta=%lld\n", __func__, (unsigned long long) nexttbtt, (long long) ((long long) nexttbtt * 1024LL) - (long long) tsf_beacon); /* XXX cfpcount? */ if (nexttbtt > tsftu) { uint32_t countdiff, oldtbtt, remainder; oldtbtt = nexttbtt; remainder = (nexttbtt - tsftu) % intval; nexttbtt = tsftu + remainder; countdiff = (oldtbtt - nexttbtt) / intval % dtimperiod; if (dtimcount > countdiff) { dtimcount -= countdiff; } else { dtimcount += dtimperiod - countdiff; } } else { //nexttbtt <= tsftu uint32_t countdiff, oldtbtt, remainder; oldtbtt = nexttbtt; remainder = (tsftu - nexttbtt) % intval; nexttbtt = tsftu - remainder + intval; countdiff = (nexttbtt - oldtbtt) / intval % dtimperiod; if (dtimcount > countdiff) { dtimcount -= countdiff; } else { dtimcount += dtimperiod - countdiff; } } DPRINTF(sc, ATH_DEBUG_BEACON, "%s: adj nexttbtt=%llu, rx tsf delta=%lld\n", __func__, (unsigned long long) nexttbtt, (long long) ((long long)nexttbtt * 1024LL) - (long long)tsf); memset(&bs, 0, sizeof(bs)); bs.bs_intval = intval; bs.bs_nexttbtt = nexttbtt; bs.bs_dtimperiod = dtimperiod*intval; bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; bs.bs_cfpmaxduration = 0; #if 0 /* * The 802.11 layer records the offset to the DTIM * bitmap while receiving beacons; use it here to * enable h/w detection of our AID being marked in * the bitmap vector (to indicate frames for us are * pending at the AP). * XXX do DTIM handling in s/w to WAR old h/w bugs * XXX enable based on h/w rev for newer chips */ bs.bs_timoffset = ni->ni_timoff; #endif /* * Calculate the number of consecutive beacons to miss * before taking a BMISS interrupt. * Note that we clamp the result to at most 10 beacons. */ bs.bs_bmissthreshold = vap->iv_bmissthreshold; if (bs.bs_bmissthreshold > 10) bs.bs_bmissthreshold = 10; else if (bs.bs_bmissthreshold <= 0) bs.bs_bmissthreshold = 1; /* * Calculate sleep duration. The configuration is * given in ms. We insure 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 = roundup(IEEE80211_MS_TO_TU(100), bs.bs_intval); if (bs.bs_sleepduration > bs.bs_dtimperiod) bs.bs_sleepduration = roundup(bs.bs_sleepduration, bs.bs_dtimperiod); DPRINTF(sc, ATH_DEBUG_BEACON, "%s: tsf %ju tsf:tu %u intval %u nexttbtt %u dtim %u " "nextdtim %u bmiss %u sleep %u cfp:period %u " "maxdur %u next %u timoffset %u\n" , __func__ , tsf , tsftu , bs.bs_intval , bs.bs_nexttbtt , bs.bs_dtimperiod , bs.bs_nextdtim , bs.bs_bmissthreshold , bs.bs_sleepduration , bs.bs_cfpperiod , bs.bs_cfpmaxduration , bs.bs_cfpnext , bs.bs_timoffset ); ath_hal_intrset(ah, 0); ath_hal_beacontimers(ah, &bs); sc->sc_imask |= HAL_INT_BMISS; ath_hal_intrset(ah, sc->sc_imask); } else { ath_hal_intrset(ah, 0); if (nexttbtt == intval) intval |= HAL_BEACON_RESET_TSF; if (ic->ic_opmode == IEEE80211_M_IBSS) { /* * In IBSS mode enable the beacon timers but only * enable SWBA interrupts if we need to manually * prepare beacon frames. Otherwise we use a * self-linked tx descriptor and let the hardware * deal with things. */ intval |= HAL_BEACON_ENA; if (!sc->sc_hasveol) sc->sc_imask |= HAL_INT_SWBA; if ((intval & HAL_BEACON_RESET_TSF) == 0) { /* * Pull nexttbtt forward to reflect * the current TSF. */ tsf = ath_hal_gettsf64(ah); tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; do { nexttbtt += intval; } while (nexttbtt < tsftu); } ath_beaconq_config(sc); } else if (ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_MBSS) { /* * In AP/mesh mode we enable the beacon timers * and SWBA interrupts to prepare beacon frames. */ intval |= HAL_BEACON_ENA; sc->sc_imask |= HAL_INT_SWBA; /* beacon prepare */ ath_beaconq_config(sc); } /* * Now dirty things because for now, the EDMA HAL has * nexttbtt and intval is TU/8. */ if (sc->sc_isedma) { nexttbtt_u8 = (nexttbtt << 3); intval_u8 = (intval << 3); if (intval & HAL_BEACON_ENA) intval_u8 |= HAL_BEACON_ENA; if (intval & HAL_BEACON_RESET_TSF) intval_u8 |= HAL_BEACON_RESET_TSF; ath_hal_beaconinit(ah, nexttbtt_u8, intval_u8); } else ath_hal_beaconinit(ah, nexttbtt, intval); sc->sc_bmisscount = 0; ath_hal_intrset(ah, sc->sc_imask); /* * When using a self-linked beacon descriptor in * ibss mode load it once here. */ if (ic->ic_opmode == IEEE80211_M_IBSS && sc->sc_hasveol) ath_beacon_start_adhoc(sc, vap); } ieee80211_free_node(ni); ATH_LOCK(sc); ath_power_restore_power_state(sc); ATH_UNLOCK(sc); #undef FUDGE #undef TSF_TO_TU }