Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * HT handling |
| 3 | * |
| 4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 5 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 6 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| 9 | * Copyright 2007-2008, Intel Corporation |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/ieee80211.h> |
| 17 | #include <net/mac80211.h> |
| 18 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 19 | #include "driver-ops.h" |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 20 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 21 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
| 22 | u16 initiator, u16 reason) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 23 | { |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 24 | struct ieee80211_local *local = sta->local; |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 25 | int i; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 26 | |
| 27 | /* check if TID is in operational state */ |
| 28 | spin_lock_bh(&sta->lock); |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 29 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 30 | spin_unlock_bh(&sta->lock); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 31 | return; |
| 32 | } |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 33 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 34 | sta->ampdu_mlme.tid_state_rx[tid] = |
| 35 | HT_AGG_STATE_REQ_STOP_BA_MSK | |
| 36 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); |
| 37 | spin_unlock_bh(&sta->lock); |
| 38 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 39 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 40 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 41 | sta->sta.addr, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 42 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 43 | |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 44 | if (drv_ampdu_action(local, IEEE80211_AMPDU_RX_STOP, |
| 45 | &sta->sta, tid, NULL)) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 46 | printk(KERN_DEBUG "HW problem - can not stop rx " |
| 47 | "aggregation for tid %d\n", tid); |
| 48 | |
| 49 | /* shutdown timer has not expired */ |
| 50 | if (initiator != WLAN_BACK_TIMER) |
| 51 | del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); |
| 52 | |
| 53 | /* check if this is a self generated aggregation halt */ |
| 54 | if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 55 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
| 56 | tid, 0, reason); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 57 | |
| 58 | /* free the reordering buffer */ |
| 59 | for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { |
| 60 | if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { |
| 61 | /* release the reordered frames */ |
| 62 | dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); |
| 63 | sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; |
| 64 | sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; |
| 65 | } |
| 66 | } |
Johannes Berg | 55687e3 | 2009-02-10 21:25:51 +0100 | [diff] [blame] | 67 | |
| 68 | spin_lock_bh(&sta->lock); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 69 | /* free resources */ |
| 70 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); |
Jouni Malinen | 4d050f1 | 2009-05-05 20:35:14 +0300 | [diff] [blame] | 71 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time); |
Johannes Berg | 55687e3 | 2009-02-10 21:25:51 +0100 | [diff] [blame] | 72 | |
| 73 | if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { |
| 74 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
| 75 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
| 76 | } |
| 77 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 78 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; |
Johannes Berg | 55687e3 | 2009-02-10 21:25:51 +0100 | [diff] [blame] | 79 | spin_unlock_bh(&sta->lock); |
Johannes Berg | d75636e | 2009-02-10 21:25:53 +0100 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, |
| 83 | u16 initiator, u16 reason) |
| 84 | { |
| 85 | struct ieee80211_local *local = sdata->local; |
| 86 | struct sta_info *sta; |
| 87 | |
| 88 | /* stop HW Rx aggregation. ampdu_action existence |
| 89 | * already verified in session init so we add the BUG_ON */ |
| 90 | BUG_ON(!local->ops->ampdu_action); |
| 91 | |
| 92 | rcu_read_lock(); |
| 93 | |
| 94 | sta = sta_info_get(local, ra); |
| 95 | if (!sta) { |
| 96 | rcu_read_unlock(); |
| 97 | return; |
| 98 | } |
| 99 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 100 | __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 101 | |
| 102 | rcu_read_unlock(); |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * After accepting the AddBA Request we activated a timer, |
| 107 | * resetting it after each frame that arrives from the originator. |
| 108 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. |
| 109 | */ |
| 110 | static void sta_rx_agg_session_timer_expired(unsigned long data) |
| 111 | { |
| 112 | /* not an elegant detour, but there is no choice as the timer passes |
| 113 | * only one argument, and various sta_info are needed here, so init |
| 114 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 115 | * array gives the sta through container_of */ |
| 116 | u8 *ptid = (u8 *)data; |
| 117 | u8 *timer_to_id = ptid - *ptid; |
| 118 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
| 119 | timer_to_tid[0]); |
| 120 | |
| 121 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 122 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); |
| 123 | #endif |
| 124 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
| 125 | (u16)*ptid, WLAN_BACK_TIMER, |
| 126 | WLAN_REASON_QSTA_TIMEOUT); |
| 127 | } |
| 128 | |
| 129 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, |
| 130 | u8 dialog_token, u16 status, u16 policy, |
| 131 | u16 buf_size, u16 timeout) |
| 132 | { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 133 | struct ieee80211_local *local = sdata->local; |
| 134 | struct sk_buff *skb; |
| 135 | struct ieee80211_mgmt *mgmt; |
| 136 | u16 capab; |
| 137 | |
| 138 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 139 | |
| 140 | if (!skb) { |
| 141 | printk(KERN_DEBUG "%s: failed to allocate buffer " |
| 142 | "for addba resp frame\n", sdata->dev->name); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 147 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 148 | memset(mgmt, 0, 24); |
| 149 | memcpy(mgmt->da, da, ETH_ALEN); |
| 150 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 151 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
| 152 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 153 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 154 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| 155 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| 156 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 157 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 158 | IEEE80211_STYPE_ACTION); |
| 159 | |
| 160 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); |
| 161 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 162 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; |
| 163 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; |
| 164 | |
| 165 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ |
| 166 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| 167 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ |
| 168 | |
| 169 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); |
| 170 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); |
| 171 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); |
| 172 | |
| 173 | ieee80211_tx_skb(sdata, skb, 1); |
| 174 | } |
| 175 | |
| 176 | void ieee80211_process_addba_request(struct ieee80211_local *local, |
| 177 | struct sta_info *sta, |
| 178 | struct ieee80211_mgmt *mgmt, |
| 179 | size_t len) |
| 180 | { |
| 181 | struct ieee80211_hw *hw = &local->hw; |
| 182 | struct ieee80211_conf *conf = &hw->conf; |
| 183 | struct tid_ampdu_rx *tid_agg_rx; |
| 184 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; |
| 185 | u8 dialog_token; |
| 186 | int ret = -EOPNOTSUPP; |
| 187 | |
| 188 | /* extract session parameters from addba request frame */ |
| 189 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; |
| 190 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); |
| 191 | start_seq_num = |
| 192 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; |
| 193 | |
| 194 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); |
| 195 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; |
| 196 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| 197 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
| 198 | |
| 199 | status = WLAN_STATUS_REQUEST_DECLINED; |
| 200 | |
Sujith | 722f069 | 2009-03-17 08:50:06 +0530 | [diff] [blame] | 201 | if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { |
| 202 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 203 | printk(KERN_DEBUG "Suspend in progress. " |
| 204 | "Denying ADDBA request\n"); |
| 205 | #endif |
| 206 | goto end_no_lock; |
| 207 | } |
| 208 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 209 | /* sanity check for incoming parameters: |
| 210 | * check if configuration can support the BA policy |
| 211 | * and if buffer size does not exceeds max value */ |
| 212 | /* XXX: check own ht delayed BA capability?? */ |
| 213 | if (((ba_policy != 1) |
| 214 | && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) |
| 215 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { |
| 216 | status = WLAN_STATUS_INVALID_QOS_PARAM; |
| 217 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 218 | if (net_ratelimit()) |
| 219 | printk(KERN_DEBUG "AddBA Req with bad params from " |
| 220 | "%pM on tid %u. policy %d, buffer size %d\n", |
| 221 | mgmt->sa, tid, ba_policy, |
| 222 | buf_size); |
| 223 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 224 | goto end_no_lock; |
| 225 | } |
| 226 | /* determine default buffer size */ |
| 227 | if (buf_size == 0) { |
| 228 | struct ieee80211_supported_band *sband; |
| 229 | |
| 230 | sband = local->hw.wiphy->bands[conf->channel->band]; |
| 231 | buf_size = IEEE80211_MIN_AMPDU_BUF; |
| 232 | buf_size = buf_size << sband->ht_cap.ampdu_factor; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | /* examine state machine */ |
| 237 | spin_lock_bh(&sta->lock); |
| 238 | |
| 239 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { |
| 240 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 241 | if (net_ratelimit()) |
| 242 | printk(KERN_DEBUG "unexpected AddBA Req from " |
| 243 | "%pM on tid %u\n", |
| 244 | mgmt->sa, tid); |
| 245 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 246 | goto end; |
| 247 | } |
| 248 | |
| 249 | /* prepare A-MPDU MLME for Rx aggregation */ |
| 250 | sta->ampdu_mlme.tid_rx[tid] = |
| 251 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); |
| 252 | if (!sta->ampdu_mlme.tid_rx[tid]) { |
| 253 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 254 | if (net_ratelimit()) |
| 255 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", |
| 256 | tid); |
| 257 | #endif |
| 258 | goto end; |
| 259 | } |
| 260 | /* rx timer */ |
| 261 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = |
| 262 | sta_rx_agg_session_timer_expired; |
| 263 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = |
| 264 | (unsigned long)&sta->timer_to_tid[tid]; |
| 265 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); |
| 266 | |
| 267 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
| 268 | |
| 269 | /* prepare reordering buffer */ |
| 270 | tid_agg_rx->reorder_buf = |
| 271 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); |
Jouni Malinen | 4d050f1 | 2009-05-05 20:35:14 +0300 | [diff] [blame] | 272 | tid_agg_rx->reorder_time = |
| 273 | kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC); |
| 274 | if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 275 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 276 | if (net_ratelimit()) |
| 277 | printk(KERN_ERR "can not allocate reordering buffer " |
| 278 | "to tid %d\n", tid); |
| 279 | #endif |
Jouni Malinen | 4d050f1 | 2009-05-05 20:35:14 +0300 | [diff] [blame] | 280 | kfree(tid_agg_rx->reorder_buf); |
| 281 | kfree(tid_agg_rx->reorder_time); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 282 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
Jouni Malinen | 4d050f1 | 2009-05-05 20:35:14 +0300 | [diff] [blame] | 283 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 284 | goto end; |
| 285 | } |
| 286 | |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 287 | ret = drv_ampdu_action(local, IEEE80211_AMPDU_RX_START, |
| 288 | &sta->sta, tid, &start_seq_num); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 289 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 290 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); |
| 291 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 292 | |
| 293 | if (ret) { |
| 294 | kfree(tid_agg_rx->reorder_buf); |
| 295 | kfree(tid_agg_rx); |
| 296 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
| 297 | goto end; |
| 298 | } |
| 299 | |
| 300 | /* change state and send addba resp */ |
| 301 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; |
| 302 | tid_agg_rx->dialog_token = dialog_token; |
| 303 | tid_agg_rx->ssn = start_seq_num; |
| 304 | tid_agg_rx->head_seq_num = start_seq_num; |
| 305 | tid_agg_rx->buf_size = buf_size; |
| 306 | tid_agg_rx->timeout = timeout; |
| 307 | tid_agg_rx->stored_mpdu_num = 0; |
| 308 | status = WLAN_STATUS_SUCCESS; |
| 309 | end: |
| 310 | spin_unlock_bh(&sta->lock); |
| 311 | |
| 312 | end_no_lock: |
| 313 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, |
| 314 | dialog_token, status, 1, buf_size, timeout); |
| 315 | } |