diff options
author | Sam Leffler <sam@FreeBSD.org> | 2009-01-08 17:12:47 +0000 |
---|---|---|
committer | Sam Leffler <sam@FreeBSD.org> | 2009-01-08 17:12:47 +0000 |
commit | 10ad9a77f391233a7052a3715578dda5a6e9812e (patch) | |
tree | 6038542738398db4d8d4a8e36ed50ac642a506ac /sys/net80211/ieee80211_tdma.c | |
parent | ba181a0efd532a8ea381523d736a4c43d3794ac7 (diff) | |
download | src-10ad9a77f391233a7052a3715578dda5a6e9812e.tar.gz src-10ad9a77f391233a7052a3715578dda5a6e9812e.zip |
TDMA support for long distance point-to-point links using ath devices:
o add net80211 support for a tdma vap that is built on top of the
existing adhoc-demo support
o add tdma scheduling of frame transmission to the ath driver; it's
conceivable other devices might be capable of this too in which case
they can make use of the 802.11 protocol additions etc.
o add minor bits to user tools that need to know: ifconfig to setup and
configure, new statistics in athstats, and new debug mask bits
While the architecture can support >2 slots in a TDMA BSS the current
design is intended (and tested) for only 2 slots.
Sponsored by: Intel
Notes
Notes:
svn path=/head/; revision=186904
Diffstat (limited to 'sys/net80211/ieee80211_tdma.c')
-rw-r--r-- | sys/net80211/ieee80211_tdma.c | 715 |
1 files changed, 715 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_tdma.c b/sys/net80211/ieee80211_tdma.c new file mode 100644 index 000000000000..b41e0f83b39c --- /dev/null +++ b/sys/net80211/ieee80211_tdma.c @@ -0,0 +1,715 @@ +/*- + * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting + * Copyright (c) 2007-2009 Intel Corporation + * 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. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, 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 DAMAGE. + */ + +#include <sys/cdefs.h> +#ifdef __FreeBSD__ +__FBSDID("$FreeBSD$"); +#endif + +/* + * IEEE 802.11 TDMA mode support. + */ +#include "opt_inet.h" +#include "opt_wlan.h" + +#ifdef IEEE80211_SUPPORT_TDMA +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/malloc.h> +#include <sys/kernel.h> + +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/endian.h> +#include <sys/errno.h> +#include <sys/proc.h> +#include <sys/sysctl.h> + +#include <net/if.h> +#include <net/if_media.h> +#include <net/if_llc.h> +#include <net/ethernet.h> + +#include <net/bpf.h> + +#include <net80211/ieee80211_var.h> +#include <net80211/ieee80211_tdma.h> +#include <net80211/ieee80211_input.h> + +#include "opt_tdma.h" +#ifndef TDMA_SLOTLEN_DEFAULT +#define TDMA_SLOTLEN_DEFAULT 10*1000 /* 10ms */ +#endif +#ifndef TDMA_SLOTCNT_DEFAULT +#define TDMA_SLOTCNT_DEFAULT 2 /* 2x (pt-to-pt) */ +#endif +#ifndef TDMA_BINTVAL_DEFAULT +#define TDMA_BINTVAL_DEFAULT 5 /* 5x ~= 100TU beacon intvl */ +#endif +#ifndef TDMA_TXRATE_11B_DEFAULT +#define TDMA_TXRATE_11B_DEFAULT 2*11 +#endif +#ifndef TDMA_TXRATE_11G_DEFAULT +#define TDMA_TXRATE_11G_DEFAULT 2*24 +#endif +#ifndef TDMA_TXRATE_11A_DEFAULT +#define TDMA_TXRATE_11A_DEFAULT 2*24 +#endif + +static void tdma_vdetach(struct ieee80211vap *vap); +static int tdma_newstate(struct ieee80211vap *, enum ieee80211_state, int); +static void tdma_beacon_miss(struct ieee80211vap *vap); +static void tdma_recv_mgmt(struct ieee80211_node *, struct mbuf *, + int subtype, int rssi, int noise, uint32_t rstamp); +static int tdma_update(struct ieee80211vap *vap, + const struct ieee80211_tdma_param *tdma, struct ieee80211_node *ni, + int pickslot); +static int tdma_process_params(struct ieee80211_node *ni, + const u_int8_t *ie, u_int32_t rstamp, const struct ieee80211_frame *wh); + +static void +setackpolicy(struct ieee80211com *ic, int noack) +{ + struct ieee80211_wme_state *wme = &ic->ic_wme; + int ac; + + for (ac = 0; ac < WME_NUM_AC; ac++) { + wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; + wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; + } +} + +void +ieee80211_tdma_vattach(struct ieee80211vap *vap) +{ + struct ieee80211_tdma_state *ts; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + + ts = (struct ieee80211_tdma_state *) malloc( + sizeof(struct ieee80211_tdma_state), M_80211_VAP, M_NOWAIT | M_ZERO); + if (ts == NULL) { + printf("%s: cannot allocate TDMA state block\n", __func__); + /* NB: fall back to adhdemo mode */ + vap->iv_caps &= ~IEEE80211_C_TDMA; + return; + } + /* NB: default configuration is passive so no beacons */ + ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT; + ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT; + ts->tdma_bintval = TDMA_BINTVAL_DEFAULT; + ts->tdma_slot = 1; /* passive operation */ + + /* setup default fixed rates */ + vap->iv_txparms[IEEE80211_MODE_11B].ucastrate = TDMA_TXRATE_11B_DEFAULT; + vap->iv_txparms[IEEE80211_MODE_11B].mcastrate = TDMA_TXRATE_11B_DEFAULT; + vap->iv_txparms[IEEE80211_MODE_11G].ucastrate = TDMA_TXRATE_11G_DEFAULT; + vap->iv_txparms[IEEE80211_MODE_11G].mcastrate = TDMA_TXRATE_11G_DEFAULT; + vap->iv_txparms[IEEE80211_MODE_11A].ucastrate = TDMA_TXRATE_11A_DEFAULT; + vap->iv_txparms[IEEE80211_MODE_11A].mcastrate = TDMA_TXRATE_11A_DEFAULT; + + setackpolicy(vap->iv_ic, 1); /* disable ACK's */ + + ts->tdma_opdetach = vap->iv_opdetach; + vap->iv_opdetach = tdma_vdetach; + ts->tdma_newstate = vap->iv_newstate; + vap->iv_newstate = tdma_newstate; + vap->iv_bmiss = tdma_beacon_miss; + ts->tdma_recv_mgmt = vap->iv_recv_mgmt; + vap->iv_recv_mgmt = tdma_recv_mgmt; + + vap->iv_tdma = ts; +} + +static void +tdma_vdetach(struct ieee80211vap *vap) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + ts->tdma_opdetach(vap); + free(vap->iv_tdma, M_80211_VAP); + + setackpolicy(vap->iv_ic, 0); /* enable ACK's */ +} + +/* + * TDMA state machine handler. + */ +static int +tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + enum ieee80211_state ostate; + int status; + + IEEE80211_LOCK_ASSERT(vap->iv_ic); + + ostate = vap->iv_state; + IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", + __func__, ieee80211_state_name[ostate], + ieee80211_state_name[nstate], arg); + + if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) + callout_stop(&vap->iv_swbmiss); + if (nstate == IEEE80211_S_SCAN && + (ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) && + ts->tdma_slot != 0) { + /* + * Override adhoc behaviour when operating as a slave; + * we need to scan even if the channel is locked. + */ + vap->iv_state = nstate; /* state transition */ + ieee80211_cancel_scan(vap); /* background scan */ + if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { + ieee80211_check_scan(vap, + vap->iv_scanreq_flags, + vap->iv_scanreq_duration, + vap->iv_scanreq_mindwell, + vap->iv_scanreq_maxdwell, + vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); + vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; + } else + ieee80211_check_scan_current(vap); + status = 0; + } else { + status = ts->tdma_newstate(vap, nstate, arg); + } + if (status == 0 && + nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN && + (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) && + ts->tdma_slot != 0) { + /* + * Start s/w beacon miss timer for slave devices w/o + * hardware support. The 2x is a fudge for our doing + * this in software. + */ + vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( + 2 * vap->iv_bmissthreshold * ts->tdma_bintval * + ((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024)); + vap->iv_swbmiss_count = 0; + callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, + ieee80211_swbmiss, vap); + } + return status; +} + +static void +tdma_beacon_miss(struct ieee80211vap *vap) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); + KASSERT(vap->iv_state == IEEE80211_S_RUN, + ("wrong state %d", vap->iv_state)); + + IEEE80211_DPRINTF(vap, + IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG, + "beacon miss, mode %u state %s\n", + vap->iv_opmode, ieee80211_state_name[vap->iv_state]); + + if (ts->tdma_peer != NULL) { /* XXX? can this be null? */ + ieee80211_notify_node_leave(vap->iv_bss); + ts->tdma_peer = NULL; + /* + * Treat beacon miss like an associate failure wrt the + * scan policy; this forces the entry in the scan cache + * to be ignored after several tries. + */ + ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, + IEEE80211_STATUS_TIMEOUT); + } +#if 0 + ts->tdma_inuse = 0; /* clear slot usage */ +#endif + ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); +} + +static void +tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, + int subtype, int rssi, int noise, uint32_t rstamp) +{ + struct ieee80211com *ic = ni->ni_ic; + struct ieee80211vap *vap = ni->ni_vap; + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + if (subtype == IEEE80211_FC0_SUBTYPE_BEACON && + (ic->ic_flags & IEEE80211_F_SCAN) == 0) { + struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *); + struct ieee80211_scanparams scan; + + if (ieee80211_parse_beacon(ni, m0, &scan) != 0) + return; + if (scan.tdma == NULL) { + /* + * TDMA stations must beacon a TDMA ie; ignore + * any other station. + * XXX detect overlapping bss and change channel + */ + IEEE80211_DISCARD(vap, + IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, + wh, ieee80211_mgt_subtype_name[subtype >> + IEEE80211_FC0_SUBTYPE_SHIFT], + "%s", "no TDMA ie"); + vap->iv_stats.is_rx_mgtdiscard++; + return; + } + if (ni == vap->iv_bss && + !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { + /* + * Fake up a node for this newly + * discovered member of the IBSS. + */ + ni = ieee80211_add_neighbor(vap, wh, &scan); + if (ni == NULL) { + /* NB: stat kept for alloc failure */ + return; + } + } + /* + * Check for state updates. + */ + if (IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) { + /* + * Count frame now that we know it's to be processed. + */ + vap->iv_stats.is_rx_beacon++; + IEEE80211_NODE_STAT(ni, rx_beacons); + /* + * Record tsf of last beacon. NB: this must be + * done before calling tdma_process_params + * as deeper routines reference it. + */ + memcpy(&ni->ni_tstamp.data, scan.tstamp, + sizeof(ni->ni_tstamp.data)); + /* + * Count beacon frame for s/w bmiss handling. + */ + vap->iv_swbmiss_count++; + vap->iv_bmiss_count = 0; + /* + * Process tdma ie. The contents are used to sync + * the slot timing, reconfigure the bss, etc. + */ + (void) tdma_process_params(ni, scan.tdma, rstamp, wh); + return; + } + /* + * NB: defer remaining work to the adhoc code; this causes + * 2x parsing of the frame but should happen infrequently + */ + } + ts->tdma_recv_mgmt(ni, m0, subtype, rssi, noise, rstamp); +} + +/* + * Update TDMA state on receipt of a beacon frame with + * a TDMA information element. The sender's identity + * is provided so we can track who our peer is. If pickslot + * is non-zero we scan the slot allocation state in the ie + * locate a free slot for our use. + */ +static int +tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma, + struct ieee80211_node *ni, int pickslot) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + int slotlen, slotcnt, slot, bintval; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + + slotlen = le16toh(tdma->tdma_slotlen); + slotcnt = tdma->tdma_slotcnt; + bintval = tdma->tdma_bintval; + + /* XXX rate-limit printf's */ + if (!(2 <= slotcnt && slotcnt <= IEEE80211_TDMA_MAXSLOTS)) { + printf("%s: bogus slot cnt %u\n", __func__, slotcnt); + return 0; + } + /* XXX magic constants */ + if (slotlen < 2 || slotlen > (0xfffff/100)) { + printf("%s: bogus slot len %u\n", __func__, slotlen); + return 0; + } + if (bintval < 1) { + printf("%s: bogus beacon interval %u\n", __func__, bintval); + return 0; + } + if (pickslot) { + /* + * Pick unoccupied slot. Note we never choose slot 0. + */ + for (slot = slotcnt-1; slot > 0; slot--) + if (isclr(tdma->tdma_inuse, slot)) + break; + if (slot <= 0) { + printf("%s: no free slot, slotcnt %u inuse: 0x%x\n", + __func__, slotcnt, tdma->tdma_inuse[0]); + /* XXX need to do something better */ + return 0; + } + } else + slot = ts->tdma_slot; + + if (slotcnt != ts->tdma_slotcnt || + 100*slotlen != ts->tdma_slotlen || + bintval != ts->tdma_bintval || + slot != ts->tdma_slot || + ts->tdma_peer != ni) { + /* + * New/changed parameters; update runtime state. + */ + /* XXX overwrites user parameters */ + ts->tdma_slotcnt = slotcnt; + ts->tdma_slotlen = 100*slotlen; + ts->tdma_slot = slot; + ts->tdma_bintval = bintval; + /* mark beacon to be updated before next xmit */ + ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); + + IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, + "%s: slot %u slotcnt %u slotlen %u us bintval %u\n", + __func__, slot, slotcnt, 100*slotlen, tdma->tdma_bintval); + } + /* + * Notify driver. Note we can be called before + * entering RUN state if we scanned and are + * joining an existing bss. In that case do not + * call the driver because not all necessary state + * has been setup. The next beacon will dtrt. + */ + if (vap->iv_state == IEEE80211_S_RUN) + vap->iv_ic->ic_tdma_update(ni, tdma); + /* + * Dispatch join event on first beacon from new master. + */ + if (ts->tdma_peer != ni) { + if (ts->tdma_peer != NULL) + ieee80211_notify_node_leave(vap->iv_bss); + ieee80211_notify_node_join(ni, 1); + /* NB: no reference, we just use the address */ + ts->tdma_peer = ni; + } + return 1; +} + +/* + * Process received TDMA parameters. + */ +static int +tdma_process_params(struct ieee80211_node *ni, + const u_int8_t *ie, u_int32_t rstamp, const struct ieee80211_frame *wh) +{ + struct ieee80211vap *vap = ni->ni_vap; + struct ieee80211_tdma_state *ts = vap->iv_tdma; + const struct ieee80211_tdma_param *tdma = + (const struct ieee80211_tdma_param *) ie; + u_int len = ie[1]; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + + if (len < sizeof(*tdma) - 2) { + IEEE80211_DISCARD_IE(vap, + IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, + wh, "tdma", "too short, len %u", len); + return IEEE80211_REASON_IE_INVALID; + } + if (tdma->tdma_version != TDMA_VERSION) { + IEEE80211_DISCARD_IE(vap, + IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, + wh, "tdma", "bad version %u", tdma->tdma_version); + return IEEE80211_REASON_IE_INVALID; + } + /* + * Can reach here while scanning, update + * operational state only in RUN state. + */ + if (vap->iv_state == IEEE80211_S_RUN) { + if (tdma->tdma_slot != ts->tdma_slot && + isclr(ts->tdma_inuse, tdma->tdma_slot)) { + IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni, + "discovered in slot %u", tdma->tdma_slot); + setbit(ts->tdma_inuse, tdma->tdma_slot); + /* XXX dispatch event only when operating as master */ + if (ts->tdma_slot == 0) + ieee80211_notify_node_join(ni, 1); + } + setbit(ts->tdma_active, tdma->tdma_slot); + if (tdma->tdma_slot == ts->tdma_slot-1) { + /* + * Slave tsf synchronization to station + * just before us in the schedule. The driver + * is responsible for copying the timestamp + * of the received beacon into our beacon + * frame so the sender can calculate round + * trip time. We cannot do that here because + * we don't know how to update our beacon frame. + */ + (void) tdma_update(vap, tdma, ni, 0); + /* XXX reschedule swbmiss timer on parameter change */ + } else if (tdma->tdma_slot == ts->tdma_slot+1) { + uint64_t tstamp; + int32_t rtt; + /* + * Use returned timstamp to calculate the + * roundtrip time. + */ + memcpy(&tstamp, tdma->tdma_tstamp, 8); + /* XXX use only 15 bits of rstamp */ + rtt = rstamp - (le64toh(tstamp) & 0x7fff); + if (rtt < 0) + rtt += 0x7fff; + /* XXX hack to quiet normal use */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X, + "tdma rtt %5u [rstamp %5u tstamp %llu]\n", + rtt, rstamp, + (unsigned long long) le64toh(tstamp)); + } else if (tdma->tdma_slot == ts->tdma_slot && + le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) { + /* + * Station using the same slot as us and has + * been around longer than us; we must move. + * Note this can happen if stations do not + * see each other while scanning. + */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, + "slot %u collision rxtsf %llu tsf %llu\n", + tdma->tdma_slot, + (unsigned long long) le64toh(ni->ni_tstamp.tsf), + vap->iv_bss->ni_tstamp.tsf); + setbit(ts->tdma_inuse, tdma->tdma_slot); + + (void) tdma_update(vap, tdma, ni, 1); + } + } + return 0; +} + +int +ieee80211_tdma_getslot(struct ieee80211vap *vap) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + return ts->tdma_slot; +} + +/* + * Parse a TDMA ie on station join and use it to setup node state. + */ +void +ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie) +{ + struct ieee80211vap *vap = ni->ni_vap; + + if (vap->iv_caps & IEEE80211_C_TDMA) { + const struct ieee80211_tdma_param *tdma = + (const struct ieee80211_tdma_param *)ie; + struct ieee80211_tdma_state *ts = vap->iv_tdma; + /* + * Adopt TDMA configuration when joining an + * existing network. + */ + setbit(ts->tdma_inuse, tdma->tdma_slot); + (void) tdma_update(vap, tdma, ni, 1); + /* + * Propagate capabilities based on the local + * configuration and the remote station's advertised + * capabilities. In particular this permits us to + * enable use of QoS to disable ACK's. + */ + if ((vap->iv_flags & IEEE80211_F_WME) && + ni->ni_ies.wme_ie != NULL) + ni->ni_flags |= IEEE80211_NODE_QOS; + } +} + +#define TDMA_OUI_BYTES 0x00, 0x03, 0x7f +/* + * Add a TDMA parameters element to a frame. + */ +uint8_t * +ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap) +{ +#define ADDSHORT(frm, v) do { \ + frm[0] = (v) & 0xff; \ + frm[1] = (v) >> 8; \ + frm += 2; \ +} while (0) + static const struct ieee80211_tdma_param param = { + .tdma_id = IEEE80211_ELEMID_VENDOR, + .tdma_len = sizeof(struct ieee80211_tdma_param) - 2, + .tdma_oui = { TDMA_OUI_BYTES }, + .tdma_type = TDMA_OUI_TYPE, + .tdma_subtype = TDMA_SUBTYPE_PARAM, + .tdma_version = TDMA_VERSION, + }; + const struct ieee80211_tdma_state *tdma = vap->iv_tdma; + uint16_t slotlen; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + + memcpy(frm, ¶m, sizeof(param)); + frm += __offsetof(struct ieee80211_tdma_param, tdma_slot); + *frm++ = tdma->tdma_slot; + *frm++ = tdma->tdma_slotcnt; + /* NB: convert units to fit in 16-bits */ + slotlen = tdma->tdma_slotlen / 100; /* 100us units */ + ADDSHORT(frm, slotlen); + *frm++ = tdma->tdma_bintval; + *frm++ = tdma->tdma_inuse[0]; + frm += 10; /* pad+timestamp */ + return frm; +#undef ADDSHORT +} +#undef TDMA_OUI_BYTES + +/* + * Update TDMA state at TBTT. + */ +void +ieee80211_tdma_update_beacon(struct ieee80211vap *vap, + struct ieee80211_beacon_offsets *bo) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + KASSERT(vap->iv_caps & IEEE80211_C_TDMA, + ("not a tdma vap, caps 0x%x", vap->iv_caps)); + + if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) { + (void) ieee80211_add_tdma(bo->bo_tdma, vap); + clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA); + } + if (ts->tdma_slot != 0) /* only on master */ + return; + if (ts->tdma_count <= 0) { + /* + * Time to update the mask of active/inuse stations. + * We track stations that we've received a beacon + * frame from and update this mask periodically. + * This allows us to miss a few beacons before marking + * a slot free for re-use. + */ + ts->tdma_inuse[0] = ts->tdma_active[0]; + ts->tdma_active[0] = 0x01; + /* update next time 'round */ + /* XXX use notify framework */ + setbit(bo->bo_flags, IEEE80211_BEACON_TDMA); + /* NB: use s/w beacon miss threshold; may be too high */ + ts->tdma_count = vap->iv_bmissthreshold-1; + } else + ts->tdma_count--; +} + +int +ieee80211_tdma_ioctl_get80211(struct ieee80211vap *vap, + struct ieee80211req *ireq) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) + return EOPNOTSUPP; + + switch (ireq->i_type) { + case IEEE80211_IOC_TDMA_SLOT: + ireq->i_val = ts->tdma_slot; + break; + case IEEE80211_IOC_TDMA_SLOTCNT: + ireq->i_val = ts->tdma_slotcnt; + break; + case IEEE80211_IOC_TDMA_SLOTLEN: + ireq->i_val = ts->tdma_slotlen; + break; + case IEEE80211_IOC_TDMA_BINTERVAL: + ireq->i_val = ts->tdma_bintval; + break; + default: + return EINVAL; + } + return 0; +} + +int +ieee80211_tdma_ioctl_set80211(struct ieee80211vap *vap, + struct ieee80211req *ireq) +{ + struct ieee80211_tdma_state *ts = vap->iv_tdma; + + if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) + return EOPNOTSUPP; + + switch (ireq->i_type) { + case IEEE80211_IOC_TDMA_SLOT: + if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt)) + return EINVAL; + if (ireq->i_val != ts->tdma_slot) { + ts->tdma_slot = ireq->i_val; + return ERESTART; + } + break; + case IEEE80211_IOC_TDMA_SLOTCNT: + if (!(2 <= ireq->i_val && + ireq->i_val <= IEEE80211_TDMA_MAXSLOTS)) + return EINVAL; + if (ireq->i_val != ts->tdma_slotcnt) { + ts->tdma_slotcnt = ireq->i_val; + return ERESTART; + } + break; + case IEEE80211_IOC_TDMA_SLOTLEN: + /* + * XXX + * 150 insures at least 1/8 TU + * 0xfffff is the max duration for bursting + * (implict by way of 16-bit data type for i_val) + */ + if (ireq->i_val < 150) + return EINVAL; + if (ireq->i_val != ts->tdma_slotlen) { + ts->tdma_slotlen = ireq->i_val; + return ERESTART; + } + break; + case IEEE80211_IOC_TDMA_BINTERVAL: + if (ireq->i_val < 1) + return EINVAL; + if (ireq->i_val != ts->tdma_bintval) { + ts->tdma_bintval = ireq->i_val; + return ERESTART; + } + break; + default: + return EINVAL; + } + return 0; +} +#endif /* IEEE80211_SUPPORT_TDMA */ |