Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 1 | /* |
| 2 | * HT handling |
| 3 | * |
| 4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 5 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 6 | * Copyright 2005-2006, Devicescape Software, Inc. |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 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/wireless.h> |
| 18 | #include <net/mac80211.h> |
| 19 | #include "ieee80211_i.h" |
| 20 | #include "sta_info.h" |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 21 | #include "wme.h" |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 22 | |
| 23 | int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie, |
| 24 | struct ieee80211_ht_info *ht_info) |
| 25 | { |
| 26 | |
| 27 | if (ht_info == NULL) |
| 28 | return -EINVAL; |
| 29 | |
| 30 | memset(ht_info, 0, sizeof(*ht_info)); |
| 31 | |
| 32 | if (ht_cap_ie) { |
| 33 | u8 ampdu_info = ht_cap_ie->ampdu_params_info; |
| 34 | |
| 35 | ht_info->ht_supported = 1; |
| 36 | ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info); |
| 37 | ht_info->ampdu_factor = |
| 38 | ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR; |
| 39 | ht_info->ampdu_density = |
| 40 | (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2; |
| 41 | memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16); |
| 42 | } else |
| 43 | ht_info->ht_supported = 0; |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | int ieee80211_ht_addt_info_ie_to_ht_bss_info( |
| 49 | struct ieee80211_ht_addt_info *ht_add_info_ie, |
| 50 | struct ieee80211_ht_bss_info *bss_info) |
| 51 | { |
| 52 | if (bss_info == NULL) |
| 53 | return -EINVAL; |
| 54 | |
| 55 | memset(bss_info, 0, sizeof(*bss_info)); |
| 56 | |
| 57 | if (ht_add_info_ie) { |
| 58 | u16 op_mode; |
| 59 | op_mode = le16_to_cpu(ht_add_info_ie->operation_mode); |
| 60 | |
| 61 | bss_info->primary_channel = ht_add_info_ie->control_chan; |
| 62 | bss_info->bss_cap = ht_add_info_ie->ht_param; |
| 63 | bss_info->bss_op_mode = (u8)(op_mode & 0xff); |
| 64 | } |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 69 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
| 70 | const u8 *da, u16 tid, |
| 71 | u8 dialog_token, u16 start_seq_num, |
| 72 | u16 agg_size, u16 timeout) |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 73 | { |
| 74 | struct ieee80211_local *local = sdata->local; |
| 75 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
| 76 | struct sk_buff *skb; |
| 77 | struct ieee80211_mgmt *mgmt; |
| 78 | u16 capab; |
| 79 | |
| 80 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 81 | |
| 82 | if (!skb) { |
| 83 | printk(KERN_ERR "%s: failed to allocate buffer " |
| 84 | "for addba request frame\n", sdata->dev->name); |
| 85 | return; |
| 86 | } |
| 87 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 88 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 89 | memset(mgmt, 0, 24); |
| 90 | memcpy(mgmt->da, da, ETH_ALEN); |
| 91 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 92 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 93 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
| 94 | else |
| 95 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); |
| 96 | |
| 97 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 98 | IEEE80211_STYPE_ACTION); |
| 99 | |
| 100 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); |
| 101 | |
| 102 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 103 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
| 104 | |
| 105 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
| 106 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ |
| 107 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| 108 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ |
| 109 | |
| 110 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
| 111 | |
| 112 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
| 113 | mgmt->u.action.u.addba_req.start_seq_num = |
| 114 | cpu_to_le16(start_seq_num << 4); |
| 115 | |
Johannes Berg | e50db65 | 2008-09-09 15:07:09 +0200 | [diff] [blame] | 116 | ieee80211_tx_skb(sdata, skb, 0); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 117 | } |
| 118 | |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 119 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, |
| 120 | u8 dialog_token, u16 status, u16 policy, |
| 121 | u16 buf_size, u16 timeout) |
| 122 | { |
| 123 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
| 124 | struct ieee80211_local *local = sdata->local; |
| 125 | struct sk_buff *skb; |
| 126 | struct ieee80211_mgmt *mgmt; |
| 127 | u16 capab; |
| 128 | |
| 129 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 130 | |
| 131 | if (!skb) { |
| 132 | printk(KERN_DEBUG "%s: failed to allocate buffer " |
| 133 | "for addba resp frame\n", sdata->dev->name); |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 138 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 139 | memset(mgmt, 0, 24); |
| 140 | memcpy(mgmt->da, da, ETH_ALEN); |
| 141 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 142 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 143 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
| 144 | else |
| 145 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); |
| 146 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 147 | IEEE80211_STYPE_ACTION); |
| 148 | |
| 149 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); |
| 150 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 151 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; |
| 152 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; |
| 153 | |
| 154 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ |
| 155 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| 156 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ |
| 157 | |
| 158 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); |
| 159 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); |
| 160 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); |
| 161 | |
Johannes Berg | e50db65 | 2008-09-09 15:07:09 +0200 | [diff] [blame] | 162 | ieee80211_tx_skb(sdata, skb, 0); |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | static void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
| 166 | const u8 *da, u16 tid, |
| 167 | u16 initiator, u16 reason_code) |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 168 | { |
| 169 | struct ieee80211_local *local = sdata->local; |
| 170 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
| 171 | struct sk_buff *skb; |
| 172 | struct ieee80211_mgmt *mgmt; |
| 173 | u16 params; |
| 174 | |
| 175 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 176 | |
| 177 | if (!skb) { |
| 178 | printk(KERN_ERR "%s: failed to allocate buffer " |
| 179 | "for delba frame\n", sdata->dev->name); |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 184 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 185 | memset(mgmt, 0, 24); |
| 186 | memcpy(mgmt->da, da, ETH_ALEN); |
| 187 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 188 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 189 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
| 190 | else |
| 191 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); |
| 192 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 193 | IEEE80211_STYPE_ACTION); |
| 194 | |
| 195 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); |
| 196 | |
| 197 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 198 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; |
| 199 | params = (u16)(initiator << 11); /* bit 11 initiator */ |
| 200 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ |
| 201 | |
| 202 | mgmt->u.action.u.delba.params = cpu_to_le16(params); |
| 203 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); |
| 204 | |
Johannes Berg | e50db65 | 2008-09-09 15:07:09 +0200 | [diff] [blame] | 205 | ieee80211_tx_skb(sdata, skb, 0); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) |
| 209 | { |
| 210 | struct ieee80211_local *local = sdata->local; |
| 211 | struct sk_buff *skb; |
| 212 | struct ieee80211_bar *bar; |
| 213 | u16 bar_control = 0; |
| 214 | |
| 215 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
| 216 | if (!skb) { |
| 217 | printk(KERN_ERR "%s: failed to allocate buffer for " |
| 218 | "bar frame\n", sdata->dev->name); |
| 219 | return; |
| 220 | } |
| 221 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 222 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); |
| 223 | memset(bar, 0, sizeof(*bar)); |
| 224 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
| 225 | IEEE80211_STYPE_BACK_REQ); |
| 226 | memcpy(bar->ra, ra, ETH_ALEN); |
| 227 | memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); |
| 228 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
| 229 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
| 230 | bar_control |= (u16)(tid << 12); |
| 231 | bar->control = cpu_to_le16(bar_control); |
| 232 | bar->start_seq_num = cpu_to_le16(ssn); |
| 233 | |
Johannes Berg | e50db65 | 2008-09-09 15:07:09 +0200 | [diff] [blame] | 234 | ieee80211_tx_skb(sdata, skb, 0); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, |
| 238 | u16 initiator, u16 reason) |
| 239 | { |
| 240 | struct ieee80211_local *local = sdata->local; |
| 241 | struct ieee80211_hw *hw = &local->hw; |
| 242 | struct sta_info *sta; |
| 243 | int ret, i; |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 244 | |
| 245 | rcu_read_lock(); |
| 246 | |
| 247 | sta = sta_info_get(local, ra); |
| 248 | if (!sta) { |
| 249 | rcu_read_unlock(); |
| 250 | return; |
| 251 | } |
| 252 | |
| 253 | /* check if TID is in operational state */ |
| 254 | spin_lock_bh(&sta->lock); |
| 255 | if (sta->ampdu_mlme.tid_state_rx[tid] |
| 256 | != HT_AGG_STATE_OPERATIONAL) { |
| 257 | spin_unlock_bh(&sta->lock); |
| 258 | rcu_read_unlock(); |
| 259 | return; |
| 260 | } |
| 261 | sta->ampdu_mlme.tid_state_rx[tid] = |
| 262 | HT_AGG_STATE_REQ_STOP_BA_MSK | |
| 263 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); |
| 264 | spin_unlock_bh(&sta->lock); |
| 265 | |
| 266 | /* stop HW Rx aggregation. ampdu_action existence |
| 267 | * already verified in session init so we add the BUG_ON */ |
| 268 | BUG_ON(!local->ops->ampdu_action); |
| 269 | |
| 270 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 271 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", |
| 272 | ra, tid); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 273 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 274 | |
| 275 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 276 | &sta->sta, tid, NULL); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 277 | if (ret) |
| 278 | printk(KERN_DEBUG "HW problem - can not stop rx " |
| 279 | "aggregation for tid %d\n", tid); |
| 280 | |
| 281 | /* shutdown timer has not expired */ |
| 282 | if (initiator != WLAN_BACK_TIMER) |
| 283 | del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); |
| 284 | |
| 285 | /* check if this is a self generated aggregation halt */ |
| 286 | if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) |
| 287 | ieee80211_send_delba(sdata, ra, tid, 0, reason); |
| 288 | |
| 289 | /* free the reordering buffer */ |
| 290 | for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { |
| 291 | if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { |
| 292 | /* release the reordered frames */ |
| 293 | dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); |
| 294 | sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; |
| 295 | sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; |
| 296 | } |
| 297 | } |
| 298 | /* free resources */ |
| 299 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); |
| 300 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
| 301 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
| 302 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; |
| 303 | |
| 304 | rcu_read_unlock(); |
| 305 | } |
| 306 | |
| 307 | |
| 308 | /* |
| 309 | * After sending add Block Ack request we activated a timer until |
| 310 | * add Block Ack response will arrive from the recipient. |
| 311 | * If this timer expires sta_addba_resp_timer_expired will be executed. |
| 312 | */ |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 313 | static void sta_addba_resp_timer_expired(unsigned long data) |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 314 | { |
| 315 | /* not an elegant detour, but there is no choice as the timer passes |
| 316 | * only one argument, and both sta_info and TID are needed, so init |
| 317 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 318 | * array gives the sta through container_of */ |
| 319 | u16 tid = *(u8 *)data; |
| 320 | struct sta_info *temp_sta = container_of((void *)data, |
| 321 | struct sta_info, timer_to_tid[tid]); |
| 322 | |
| 323 | struct ieee80211_local *local = temp_sta->local; |
| 324 | struct ieee80211_hw *hw = &local->hw; |
| 325 | struct sta_info *sta; |
| 326 | u8 *state; |
| 327 | |
| 328 | rcu_read_lock(); |
| 329 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 330 | sta = sta_info_get(local, temp_sta->sta.addr); |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 331 | if (!sta) { |
| 332 | rcu_read_unlock(); |
| 333 | return; |
| 334 | } |
| 335 | |
| 336 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 337 | /* check if the TID waits for addBA response */ |
| 338 | spin_lock_bh(&sta->lock); |
| 339 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { |
| 340 | spin_unlock_bh(&sta->lock); |
| 341 | *state = HT_AGG_STATE_IDLE; |
| 342 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 343 | printk(KERN_DEBUG "timer expired on tid %d but we are not " |
| 344 | "expecting addBA response there", tid); |
| 345 | #endif |
| 346 | goto timer_expired_exit; |
| 347 | } |
| 348 | |
| 349 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 350 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); |
| 351 | #endif |
| 352 | |
| 353 | /* go through the state check in stop_BA_session */ |
| 354 | *state = HT_AGG_STATE_OPERATIONAL; |
| 355 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 356 | ieee80211_stop_tx_ba_session(hw, temp_sta->sta.addr, tid, |
Johannes Berg | 44d414d | 2008-09-08 17:44:28 +0200 | [diff] [blame] | 357 | WLAN_BACK_INITIATOR); |
| 358 | |
| 359 | timer_expired_exit: |
| 360 | rcu_read_unlock(); |
| 361 | } |
| 362 | |
| 363 | void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr) |
| 364 | { |
| 365 | struct ieee80211_local *local = sdata->local; |
| 366 | int i; |
| 367 | |
| 368 | for (i = 0; i < STA_TID_NUM; i++) { |
| 369 | ieee80211_stop_tx_ba_session(&local->hw, addr, i, |
| 370 | WLAN_BACK_INITIATOR); |
| 371 | ieee80211_sta_stop_rx_ba_session(sdata, addr, i, |
| 372 | WLAN_BACK_RECIPIENT, |
| 373 | WLAN_REASON_QSTA_LEAVE_QBSS); |
| 374 | } |
| 375 | } |
| 376 | |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 377 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
| 378 | { |
| 379 | struct ieee80211_local *local = hw_to_local(hw); |
| 380 | struct sta_info *sta; |
| 381 | struct ieee80211_sub_if_data *sdata; |
| 382 | u16 start_seq_num; |
| 383 | u8 *state; |
| 384 | int ret; |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 385 | |
| 386 | if (tid >= STA_TID_NUM) |
| 387 | return -EINVAL; |
| 388 | |
| 389 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 390 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", |
| 391 | ra, tid); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 392 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 393 | |
| 394 | rcu_read_lock(); |
| 395 | |
| 396 | sta = sta_info_get(local, ra); |
| 397 | if (!sta) { |
| 398 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 399 | printk(KERN_DEBUG "Could not find the station\n"); |
| 400 | #endif |
| 401 | ret = -ENOENT; |
| 402 | goto exit; |
| 403 | } |
| 404 | |
| 405 | spin_lock_bh(&sta->lock); |
| 406 | |
| 407 | /* we have tried too many times, receiver does not want A-MPDU */ |
| 408 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { |
| 409 | ret = -EBUSY; |
| 410 | goto err_unlock_sta; |
| 411 | } |
| 412 | |
| 413 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 414 | /* check if the TID is not in aggregation flow already */ |
| 415 | if (*state != HT_AGG_STATE_IDLE) { |
| 416 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 417 | printk(KERN_DEBUG "BA request denied - session is not " |
| 418 | "idle on tid %u\n", tid); |
| 419 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 420 | ret = -EAGAIN; |
| 421 | goto err_unlock_sta; |
| 422 | } |
| 423 | |
| 424 | /* prepare A-MPDU MLME for Tx aggregation */ |
| 425 | sta->ampdu_mlme.tid_tx[tid] = |
| 426 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| 427 | if (!sta->ampdu_mlme.tid_tx[tid]) { |
| 428 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 429 | if (net_ratelimit()) |
| 430 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", |
| 431 | tid); |
| 432 | #endif |
| 433 | ret = -ENOMEM; |
| 434 | goto err_unlock_sta; |
| 435 | } |
| 436 | /* Tx timer */ |
| 437 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = |
| 438 | sta_addba_resp_timer_expired; |
| 439 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = |
| 440 | (unsigned long)&sta->timer_to_tid[tid]; |
| 441 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| 442 | |
| 443 | /* create a new queue for this aggregation */ |
| 444 | ret = ieee80211_ht_agg_queue_add(local, sta, tid); |
| 445 | |
| 446 | /* case no queue is available to aggregation |
| 447 | * don't switch to aggregation */ |
| 448 | if (ret) { |
| 449 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 450 | printk(KERN_DEBUG "BA request denied - queue unavailable for" |
| 451 | " tid %d\n", tid); |
| 452 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 453 | goto err_unlock_queue; |
| 454 | } |
| 455 | sdata = sta->sdata; |
| 456 | |
| 457 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
| 458 | * call back right away, it must see that the flow has begun */ |
| 459 | *state |= HT_ADDBA_REQUESTED_MSK; |
| 460 | |
| 461 | /* This is slightly racy because the queue isn't stopped */ |
| 462 | start_seq_num = sta->tid_seq[tid]; |
| 463 | |
| 464 | if (local->ops->ampdu_action) |
| 465 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 466 | &sta->sta, tid, &start_seq_num); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 467 | |
| 468 | if (ret) { |
| 469 | /* No need to requeue the packets in the agg queue, since we |
| 470 | * held the tx lock: no packet could be enqueued to the newly |
| 471 | * allocated queue */ |
| 472 | ieee80211_ht_agg_queue_remove(local, sta, tid, 0); |
| 473 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 474 | printk(KERN_DEBUG "BA request denied - HW unavailable for" |
| 475 | " tid %d\n", tid); |
| 476 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 477 | *state = HT_AGG_STATE_IDLE; |
| 478 | goto err_unlock_queue; |
| 479 | } |
| 480 | |
| 481 | /* Will put all the packets in the new SW queue */ |
| 482 | ieee80211_requeue(local, ieee802_1d_to_ac[tid]); |
| 483 | spin_unlock_bh(&sta->lock); |
| 484 | |
| 485 | /* send an addBA request */ |
| 486 | sta->ampdu_mlme.dialog_token_allocator++; |
| 487 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = |
| 488 | sta->ampdu_mlme.dialog_token_allocator; |
| 489 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; |
| 490 | |
| 491 | |
| 492 | ieee80211_send_addba_request(sta->sdata, ra, tid, |
| 493 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, |
| 494 | sta->ampdu_mlme.tid_tx[tid]->ssn, |
| 495 | 0x40, 5000); |
| 496 | /* activate the timer for the recipient's addBA response */ |
| 497 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = |
| 498 | jiffies + ADDBA_RESP_INTERVAL; |
| 499 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| 500 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 501 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); |
| 502 | #endif |
| 503 | goto exit; |
| 504 | |
| 505 | err_unlock_queue: |
| 506 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
| 507 | sta->ampdu_mlme.tid_tx[tid] = NULL; |
| 508 | ret = -EBUSY; |
| 509 | err_unlock_sta: |
| 510 | spin_unlock_bh(&sta->lock); |
| 511 | exit: |
| 512 | rcu_read_unlock(); |
| 513 | return ret; |
| 514 | } |
| 515 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| 516 | |
| 517 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, |
| 518 | u8 *ra, u16 tid, |
| 519 | enum ieee80211_back_parties initiator) |
| 520 | { |
| 521 | struct ieee80211_local *local = hw_to_local(hw); |
| 522 | struct sta_info *sta; |
| 523 | u8 *state; |
| 524 | int ret = 0; |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 525 | |
| 526 | if (tid >= STA_TID_NUM) |
| 527 | return -EINVAL; |
| 528 | |
| 529 | rcu_read_lock(); |
| 530 | sta = sta_info_get(local, ra); |
| 531 | if (!sta) { |
| 532 | rcu_read_unlock(); |
| 533 | return -ENOENT; |
| 534 | } |
| 535 | |
| 536 | /* check if the TID is in aggregation */ |
| 537 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 538 | spin_lock_bh(&sta->lock); |
| 539 | |
| 540 | if (*state != HT_AGG_STATE_OPERATIONAL) { |
| 541 | ret = -ENOENT; |
| 542 | goto stop_BA_exit; |
| 543 | } |
| 544 | |
| 545 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 546 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", |
| 547 | ra, tid); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 548 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 549 | |
| 550 | ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); |
| 551 | |
| 552 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
| 553 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); |
| 554 | |
| 555 | if (local->ops->ampdu_action) |
| 556 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 557 | &sta->sta, tid, NULL); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 558 | |
| 559 | /* case HW denied going back to legacy */ |
| 560 | if (ret) { |
| 561 | WARN_ON(ret != -EBUSY); |
| 562 | *state = HT_AGG_STATE_OPERATIONAL; |
| 563 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); |
| 564 | goto stop_BA_exit; |
| 565 | } |
| 566 | |
| 567 | stop_BA_exit: |
| 568 | spin_unlock_bh(&sta->lock); |
| 569 | rcu_read_unlock(); |
| 570 | return ret; |
| 571 | } |
| 572 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| 573 | |
| 574 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
| 575 | { |
| 576 | struct ieee80211_local *local = hw_to_local(hw); |
| 577 | struct sta_info *sta; |
| 578 | u8 *state; |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 579 | |
| 580 | if (tid >= STA_TID_NUM) { |
| 581 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 582 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| 583 | tid, STA_TID_NUM); |
| 584 | #endif |
| 585 | return; |
| 586 | } |
| 587 | |
| 588 | rcu_read_lock(); |
| 589 | sta = sta_info_get(local, ra); |
| 590 | if (!sta) { |
| 591 | rcu_read_unlock(); |
| 592 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 593 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 594 | #endif |
| 595 | return; |
| 596 | } |
| 597 | |
| 598 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 599 | spin_lock_bh(&sta->lock); |
| 600 | |
| 601 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { |
| 602 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 603 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", |
| 604 | *state); |
| 605 | #endif |
| 606 | spin_unlock_bh(&sta->lock); |
| 607 | rcu_read_unlock(); |
| 608 | return; |
| 609 | } |
| 610 | |
| 611 | WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); |
| 612 | |
| 613 | *state |= HT_ADDBA_DRV_READY_MSK; |
| 614 | |
| 615 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
| 616 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 617 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); |
| 618 | #endif |
| 619 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); |
| 620 | } |
| 621 | spin_unlock_bh(&sta->lock); |
| 622 | rcu_read_unlock(); |
| 623 | } |
| 624 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); |
| 625 | |
| 626 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) |
| 627 | { |
| 628 | struct ieee80211_local *local = hw_to_local(hw); |
| 629 | struct sta_info *sta; |
| 630 | u8 *state; |
| 631 | int agg_queue; |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 632 | |
| 633 | if (tid >= STA_TID_NUM) { |
| 634 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 635 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| 636 | tid, STA_TID_NUM); |
| 637 | #endif |
| 638 | return; |
| 639 | } |
| 640 | |
| 641 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 642 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", |
| 643 | ra, tid); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 644 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 645 | |
| 646 | rcu_read_lock(); |
| 647 | sta = sta_info_get(local, ra); |
| 648 | if (!sta) { |
| 649 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 650 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
Johannes Berg | bacac54 | 2008-09-08 17:44:29 +0200 | [diff] [blame] | 651 | #endif |
| 652 | rcu_read_unlock(); |
| 653 | return; |
| 654 | } |
| 655 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 656 | |
| 657 | /* NOTE: no need to use sta->lock in this state check, as |
| 658 | * ieee80211_stop_tx_ba_session will let only one stop call to |
| 659 | * pass through per sta/tid |
| 660 | */ |
| 661 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { |
| 662 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 663 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); |
| 664 | #endif |
| 665 | rcu_read_unlock(); |
| 666 | return; |
| 667 | } |
| 668 | |
| 669 | if (*state & HT_AGG_STATE_INITIATOR_MSK) |
| 670 | ieee80211_send_delba(sta->sdata, ra, tid, |
| 671 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| 672 | |
| 673 | agg_queue = sta->tid_to_tx_q[tid]; |
| 674 | |
| 675 | ieee80211_ht_agg_queue_remove(local, sta, tid, 1); |
| 676 | |
| 677 | /* We just requeued the all the frames that were in the |
| 678 | * removed queue, and since we might miss a softirq we do |
| 679 | * netif_schedule_queue. ieee80211_wake_queue is not used |
| 680 | * here as this queue is not necessarily stopped |
| 681 | */ |
| 682 | netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue)); |
| 683 | spin_lock_bh(&sta->lock); |
| 684 | *state = HT_AGG_STATE_IDLE; |
| 685 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
| 686 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
| 687 | sta->ampdu_mlme.tid_tx[tid] = NULL; |
| 688 | spin_unlock_bh(&sta->lock); |
| 689 | |
| 690 | rcu_read_unlock(); |
| 691 | } |
| 692 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); |
| 693 | |
| 694 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
| 695 | const u8 *ra, u16 tid) |
| 696 | { |
| 697 | struct ieee80211_local *local = hw_to_local(hw); |
| 698 | struct ieee80211_ra_tid *ra_tid; |
| 699 | struct sk_buff *skb = dev_alloc_skb(0); |
| 700 | |
| 701 | if (unlikely(!skb)) { |
| 702 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 703 | if (net_ratelimit()) |
| 704 | printk(KERN_WARNING "%s: Not enough memory, " |
| 705 | "dropping start BA session", skb->dev->name); |
| 706 | #endif |
| 707 | return; |
| 708 | } |
| 709 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 710 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 711 | ra_tid->tid = tid; |
| 712 | |
| 713 | skb->pkt_type = IEEE80211_ADDBA_MSG; |
| 714 | skb_queue_tail(&local->skb_queue, skb); |
| 715 | tasklet_schedule(&local->tasklet); |
| 716 | } |
| 717 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| 718 | |
| 719 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
| 720 | const u8 *ra, u16 tid) |
| 721 | { |
| 722 | struct ieee80211_local *local = hw_to_local(hw); |
| 723 | struct ieee80211_ra_tid *ra_tid; |
| 724 | struct sk_buff *skb = dev_alloc_skb(0); |
| 725 | |
| 726 | if (unlikely(!skb)) { |
| 727 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 728 | if (net_ratelimit()) |
| 729 | printk(KERN_WARNING "%s: Not enough memory, " |
| 730 | "dropping stop BA session", skb->dev->name); |
| 731 | #endif |
| 732 | return; |
| 733 | } |
| 734 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 735 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 736 | ra_tid->tid = tid; |
| 737 | |
| 738 | skb->pkt_type = IEEE80211_DELBA_MSG; |
| 739 | skb_queue_tail(&local->skb_queue, skb); |
| 740 | tasklet_schedule(&local->tasklet); |
| 741 | } |
| 742 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 743 | |
| 744 | /* |
| 745 | * After accepting the AddBA Request we activated a timer, |
| 746 | * resetting it after each frame that arrives from the originator. |
| 747 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. |
| 748 | */ |
| 749 | static void sta_rx_agg_session_timer_expired(unsigned long data) |
| 750 | { |
| 751 | /* not an elegant detour, but there is no choice as the timer passes |
| 752 | * only one argument, and various sta_info are needed here, so init |
| 753 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 754 | * array gives the sta through container_of */ |
| 755 | u8 *ptid = (u8 *)data; |
| 756 | u8 *timer_to_id = ptid - *ptid; |
| 757 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
| 758 | timer_to_tid[0]); |
| 759 | |
| 760 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 761 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); |
| 762 | #endif |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 763 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 764 | (u16)*ptid, WLAN_BACK_TIMER, |
| 765 | WLAN_REASON_QSTA_TIMEOUT); |
| 766 | } |
| 767 | |
| 768 | void ieee80211_process_addba_request(struct ieee80211_local *local, |
| 769 | struct sta_info *sta, |
| 770 | struct ieee80211_mgmt *mgmt, |
| 771 | size_t len) |
| 772 | { |
| 773 | struct ieee80211_hw *hw = &local->hw; |
| 774 | struct ieee80211_conf *conf = &hw->conf; |
| 775 | struct tid_ampdu_rx *tid_agg_rx; |
| 776 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; |
| 777 | u8 dialog_token; |
| 778 | int ret = -EOPNOTSUPP; |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 779 | |
| 780 | /* extract session parameters from addba request frame */ |
| 781 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; |
| 782 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); |
| 783 | start_seq_num = |
| 784 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; |
| 785 | |
| 786 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); |
| 787 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; |
| 788 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| 789 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
| 790 | |
| 791 | status = WLAN_STATUS_REQUEST_DECLINED; |
| 792 | |
| 793 | /* sanity check for incoming parameters: |
| 794 | * check if configuration can support the BA policy |
| 795 | * and if buffer size does not exceeds max value */ |
| 796 | if (((ba_policy != 1) |
| 797 | && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA))) |
| 798 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { |
| 799 | status = WLAN_STATUS_INVALID_QOS_PARAM; |
| 800 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 801 | if (net_ratelimit()) |
| 802 | printk(KERN_DEBUG "AddBA Req with bad params from " |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 803 | "%pM on tid %u. policy %d, buffer size %d\n", |
| 804 | mgmt->sa, tid, ba_policy, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 805 | buf_size); |
| 806 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 807 | goto end_no_lock; |
| 808 | } |
| 809 | /* determine default buffer size */ |
| 810 | if (buf_size == 0) { |
| 811 | struct ieee80211_supported_band *sband; |
| 812 | |
| 813 | sband = local->hw.wiphy->bands[conf->channel->band]; |
| 814 | buf_size = IEEE80211_MIN_AMPDU_BUF; |
| 815 | buf_size = buf_size << sband->ht_info.ampdu_factor; |
| 816 | } |
| 817 | |
| 818 | |
| 819 | /* examine state machine */ |
| 820 | spin_lock_bh(&sta->lock); |
| 821 | |
| 822 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { |
| 823 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 824 | if (net_ratelimit()) |
| 825 | printk(KERN_DEBUG "unexpected AddBA Req from " |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 826 | "%pM on tid %u\n", |
| 827 | mgmt->sa, tid); |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 828 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 829 | goto end; |
| 830 | } |
| 831 | |
| 832 | /* prepare A-MPDU MLME for Rx aggregation */ |
| 833 | sta->ampdu_mlme.tid_rx[tid] = |
| 834 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); |
| 835 | if (!sta->ampdu_mlme.tid_rx[tid]) { |
| 836 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 837 | if (net_ratelimit()) |
| 838 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", |
| 839 | tid); |
| 840 | #endif |
| 841 | goto end; |
| 842 | } |
| 843 | /* rx timer */ |
| 844 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = |
| 845 | sta_rx_agg_session_timer_expired; |
| 846 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = |
| 847 | (unsigned long)&sta->timer_to_tid[tid]; |
| 848 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); |
| 849 | |
| 850 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
| 851 | |
| 852 | /* prepare reordering buffer */ |
| 853 | tid_agg_rx->reorder_buf = |
| 854 | kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC); |
| 855 | if (!tid_agg_rx->reorder_buf) { |
| 856 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 857 | if (net_ratelimit()) |
| 858 | printk(KERN_ERR "can not allocate reordering buffer " |
| 859 | "to tid %d\n", tid); |
| 860 | #endif |
| 861 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
| 862 | goto end; |
| 863 | } |
| 864 | memset(tid_agg_rx->reorder_buf, 0, |
| 865 | buf_size * sizeof(struct sk_buff *)); |
| 866 | |
| 867 | if (local->ops->ampdu_action) |
| 868 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 869 | &sta->sta, tid, &start_seq_num); |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 870 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 871 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); |
| 872 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 873 | |
| 874 | if (ret) { |
| 875 | kfree(tid_agg_rx->reorder_buf); |
| 876 | kfree(tid_agg_rx); |
| 877 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
| 878 | goto end; |
| 879 | } |
| 880 | |
| 881 | /* change state and send addba resp */ |
| 882 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; |
| 883 | tid_agg_rx->dialog_token = dialog_token; |
| 884 | tid_agg_rx->ssn = start_seq_num; |
| 885 | tid_agg_rx->head_seq_num = start_seq_num; |
| 886 | tid_agg_rx->buf_size = buf_size; |
| 887 | tid_agg_rx->timeout = timeout; |
| 888 | tid_agg_rx->stored_mpdu_num = 0; |
| 889 | status = WLAN_STATUS_SUCCESS; |
| 890 | end: |
| 891 | spin_unlock_bh(&sta->lock); |
| 892 | |
| 893 | end_no_lock: |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 894 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 895 | dialog_token, status, 1, buf_size, timeout); |
| 896 | } |
| 897 | |
| 898 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| 899 | struct sta_info *sta, |
| 900 | struct ieee80211_mgmt *mgmt, |
| 901 | size_t len) |
| 902 | { |
| 903 | struct ieee80211_hw *hw = &local->hw; |
| 904 | u16 capab; |
| 905 | u16 tid; |
| 906 | u8 *state; |
| 907 | |
| 908 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| 909 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| 910 | |
| 911 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| 912 | |
| 913 | spin_lock_bh(&sta->lock); |
| 914 | |
| 915 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { |
| 916 | spin_unlock_bh(&sta->lock); |
| 917 | return; |
| 918 | } |
| 919 | |
| 920 | if (mgmt->u.action.u.addba_resp.dialog_token != |
| 921 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { |
| 922 | spin_unlock_bh(&sta->lock); |
| 923 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 924 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); |
| 925 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 926 | return; |
| 927 | } |
| 928 | |
| 929 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| 930 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 931 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); |
| 932 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 933 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
| 934 | == WLAN_STATUS_SUCCESS) { |
| 935 | *state |= HT_ADDBA_RECEIVED_MSK; |
| 936 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
| 937 | |
| 938 | if (*state == HT_AGG_STATE_OPERATIONAL) |
| 939 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); |
| 940 | |
| 941 | spin_unlock_bh(&sta->lock); |
| 942 | } else { |
| 943 | sta->ampdu_mlme.addba_req_num[tid]++; |
| 944 | /* this will allow the state check in stop_BA_session */ |
| 945 | *state = HT_AGG_STATE_OPERATIONAL; |
| 946 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 947 | ieee80211_stop_tx_ba_session(hw, sta->sta.addr, tid, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 948 | WLAN_BACK_INITIATOR); |
| 949 | } |
| 950 | } |
| 951 | |
| 952 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
| 953 | struct sta_info *sta, |
| 954 | struct ieee80211_mgmt *mgmt, size_t len) |
| 955 | { |
| 956 | struct ieee80211_local *local = sdata->local; |
| 957 | u16 tid, params; |
| 958 | u16 initiator; |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 959 | |
| 960 | params = le16_to_cpu(mgmt->u.action.u.delba.params); |
| 961 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; |
| 962 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; |
| 963 | |
| 964 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 965 | if (net_ratelimit()) |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame^] | 966 | printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", |
| 967 | mgmt->sa, initiator ? "initiator" : "recipient", tid, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 968 | mgmt->u.action.u.delba.reason_code); |
| 969 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 970 | |
| 971 | if (initiator == WLAN_BACK_INITIATOR) |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 972 | ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 973 | WLAN_BACK_INITIATOR, 0); |
| 974 | else { /* WLAN_BACK_RECIPIENT */ |
| 975 | spin_lock_bh(&sta->lock); |
| 976 | sta->ampdu_mlme.tid_state_tx[tid] = |
| 977 | HT_AGG_STATE_OPERATIONAL; |
| 978 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 979 | ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid, |
Johannes Berg | de1ede7 | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 980 | WLAN_BACK_RECIPIENT); |
| 981 | } |
| 982 | } |