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> |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 9 | * Copyright 2007-2010, Intel Corporation |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 18 | #include <linux/export.h> |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 19 | #include <net/mac80211.h> |
| 20 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 21 | #include "driver-ops.h" |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 22 | #include "wme.h" |
| 23 | |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 24 | /** |
Johannes Berg | 73a72a8 | 2010-06-10 10:21:50 +0200 | [diff] [blame] | 25 | * DOC: TX A-MPDU aggregation |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 26 | * |
| 27 | * Aggregation on the TX side requires setting the hardware flag |
Johannes Berg | 73a72a8 | 2010-06-10 10:21:50 +0200 | [diff] [blame] | 28 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
| 29 | * packets with a flag indicating A-MPDU aggregation. The driver |
| 30 | * or device is responsible for actually aggregating the frames, |
| 31 | * as well as deciding how many and which to aggregate. |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 32 | * |
Johannes Berg | 73a72a8 | 2010-06-10 10:21:50 +0200 | [diff] [blame] | 33 | * When TX aggregation is started by some subsystem (usually the rate |
| 34 | * control algorithm would be appropriate) by calling the |
| 35 | * ieee80211_start_tx_ba_session() function, the driver will be |
| 36 | * notified via its @ampdu_action function, with the |
| 37 | * %IEEE80211_AMPDU_TX_START action. |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 38 | * |
| 39 | * In response to that, the driver is later required to call the |
Johannes Berg | 73a72a8 | 2010-06-10 10:21:50 +0200 | [diff] [blame] | 40 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
| 41 | * start the aggregation session after the peer has also responded. |
| 42 | * If the peer responds negatively, the session will be stopped |
| 43 | * again right away. Note that it is possible for the aggregation |
| 44 | * session to be stopped before the driver has indicated that it |
| 45 | * is done setting it up, in which case it must not indicate the |
| 46 | * setup completion. |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 47 | * |
Johannes Berg | 73a72a8 | 2010-06-10 10:21:50 +0200 | [diff] [blame] | 48 | * Also note that, since we also need to wait for a response from |
| 49 | * the peer, the driver is notified of the completion of the |
| 50 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the |
| 51 | * @ampdu_action callback. |
| 52 | * |
| 53 | * Similarly, when the aggregation session is stopped by the peer |
| 54 | * or something calling ieee80211_stop_tx_ba_session(), the driver's |
| 55 | * @ampdu_action function will be called with the action |
| 56 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, |
| 57 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). |
Yogesh Ashok Powar | 42624d4 | 2011-12-08 14:56:15 +0530 | [diff] [blame] | 58 | * Note that the sta can get destroyed before the BA tear down is |
| 59 | * complete. |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 60 | */ |
| 61 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 62 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
| 63 | const u8 *da, u16 tid, |
| 64 | u8 dialog_token, u16 start_seq_num, |
| 65 | u16 agg_size, u16 timeout) |
| 66 | { |
| 67 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 68 | struct sk_buff *skb; |
| 69 | struct ieee80211_mgmt *mgmt; |
| 70 | u16 capab; |
| 71 | |
| 72 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 73 | |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 74 | if (!skb) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 75 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 76 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 77 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 78 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 79 | memset(mgmt, 0, 24); |
| 80 | memcpy(mgmt->da, da, ETH_ALEN); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 81 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 82 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
Thomas Pedersen | ae2772b | 2011-10-26 14:47:29 -0700 | [diff] [blame] | 83 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
| 84 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 85 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 86 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| 87 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
Alexander Simon | 13c40c5 | 2011-11-30 16:56:34 +0100 | [diff] [blame] | 88 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| 89 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 90 | |
| 91 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 92 | IEEE80211_STYPE_ACTION); |
| 93 | |
| 94 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); |
| 95 | |
| 96 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 97 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
| 98 | |
| 99 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
| 100 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ |
| 101 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| 102 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ |
| 103 | |
| 104 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
| 105 | |
| 106 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
| 107 | mgmt->u.action.u.addba_req.start_seq_num = |
| 108 | cpu_to_le16(start_seq_num << 4); |
| 109 | |
Karl Beldan | c6e1332 | 2014-01-23 20:06:34 +0100 | [diff] [blame] | 110 | ieee80211_tx_skb(sdata, skb); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 111 | } |
| 112 | |
Felix Fietkau | 8c77124 | 2011-08-20 15:53:55 +0200 | [diff] [blame] | 113 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 114 | { |
Felix Fietkau | 8c77124 | 2011-08-20 15:53:55 +0200 | [diff] [blame] | 115 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 116 | struct ieee80211_local *local = sdata->local; |
| 117 | struct sk_buff *skb; |
| 118 | struct ieee80211_bar *bar; |
| 119 | u16 bar_control = 0; |
| 120 | |
| 121 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 122 | if (!skb) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 123 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 124 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 125 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 126 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); |
| 127 | memset(bar, 0, sizeof(*bar)); |
| 128 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
| 129 | IEEE80211_STYPE_BACK_REQ); |
| 130 | memcpy(bar->ra, ra, ETH_ALEN); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 131 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 132 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
| 133 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
Helmut Schaa | c1407b6 | 2011-08-11 16:17:41 +0200 | [diff] [blame] | 134 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 135 | bar->control = cpu_to_le16(bar_control); |
| 136 | bar->start_seq_num = cpu_to_le16(ssn); |
| 137 | |
Christian Lamparter | 2f7916f | 2012-07-07 15:13:08 +0200 | [diff] [blame] | 138 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
| 139 | IEEE80211_TX_CTL_REQ_TX_STATUS; |
Helmut Schaa | cf6bb79 | 2011-12-15 10:18:34 +0100 | [diff] [blame] | 140 | ieee80211_tx_skb_tid(sdata, skb, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 141 | } |
Felix Fietkau | 8c77124 | 2011-08-20 15:53:55 +0200 | [diff] [blame] | 142 | EXPORT_SYMBOL(ieee80211_send_bar); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 143 | |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 144 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
| 145 | struct tid_ampdu_tx *tid_tx) |
| 146 | { |
| 147 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| 148 | lockdep_assert_held(&sta->lock); |
| 149 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
| 150 | } |
| 151 | |
Johannes Berg | 30bf5f1 | 2012-12-28 09:43:03 +0100 | [diff] [blame] | 152 | /* |
| 153 | * When multiple aggregation sessions on multiple stations |
| 154 | * are being created/destroyed simultaneously, we need to |
| 155 | * refcount the global queue stop caused by that in order |
| 156 | * to not get into a situation where one of the aggregation |
| 157 | * setup or teardown re-enables queues before the other is |
| 158 | * ready to handle that. |
| 159 | * |
| 160 | * These two functions take care of this issue by keeping |
| 161 | * a global "agg_queue_stop" refcount. |
| 162 | */ |
| 163 | static void __acquires(agg_queue) |
| 164 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| 165 | { |
| 166 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 167 | |
Luciano Coelho | cca07b0 | 2014-06-13 16:30:05 +0300 | [diff] [blame] | 168 | /* we do refcounting here, so don't use the queue reason refcounting */ |
| 169 | |
Johannes Berg | 30bf5f1 | 2012-12-28 09:43:03 +0100 | [diff] [blame] | 170 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
| 171 | ieee80211_stop_queue_by_reason( |
| 172 | &sdata->local->hw, queue, |
Luciano Coelho | cca07b0 | 2014-06-13 16:30:05 +0300 | [diff] [blame] | 173 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| 174 | false); |
Johannes Berg | 30bf5f1 | 2012-12-28 09:43:03 +0100 | [diff] [blame] | 175 | __acquire(agg_queue); |
| 176 | } |
| 177 | |
| 178 | static void __releases(agg_queue) |
| 179 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| 180 | { |
| 181 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 182 | |
| 183 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) |
| 184 | ieee80211_wake_queue_by_reason( |
| 185 | &sdata->local->hw, queue, |
Luciano Coelho | cca07b0 | 2014-06-13 16:30:05 +0300 | [diff] [blame] | 186 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| 187 | false); |
Johannes Berg | 30bf5f1 | 2012-12-28 09:43:03 +0100 | [diff] [blame] | 188 | __release(agg_queue); |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * splice packets from the STA's pending to the local pending, |
| 193 | * requires a call to ieee80211_agg_splice_finish later |
| 194 | */ |
| 195 | static void __acquires(agg_queue) |
| 196 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, |
| 197 | struct tid_ampdu_tx *tid_tx, u16 tid) |
| 198 | { |
| 199 | struct ieee80211_local *local = sdata->local; |
| 200 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 201 | unsigned long flags; |
| 202 | |
| 203 | ieee80211_stop_queue_agg(sdata, tid); |
| 204 | |
| 205 | if (WARN(!tid_tx, |
| 206 | "TID %d gone but expected when splicing aggregates from the pending queue\n", |
| 207 | tid)) |
| 208 | return; |
| 209 | |
| 210 | if (!skb_queue_empty(&tid_tx->pending)) { |
| 211 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| 212 | /* copy over remaining packets */ |
| 213 | skb_queue_splice_tail_init(&tid_tx->pending, |
| 214 | &local->pending[queue]); |
| 215 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | static void __releases(agg_queue) |
| 220 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) |
| 221 | { |
| 222 | ieee80211_wake_queue_agg(sdata, tid); |
| 223 | } |
| 224 | |
| 225 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) |
| 226 | { |
| 227 | struct tid_ampdu_tx *tid_tx; |
| 228 | |
| 229 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| 230 | lockdep_assert_held(&sta->lock); |
| 231 | |
| 232 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 233 | |
| 234 | /* |
| 235 | * When we get here, the TX path will not be lockless any more wrt. |
| 236 | * aggregation, since the OPERATIONAL bit has long been cleared. |
| 237 | * Thus it will block on getting the lock, if it occurs. So if we |
| 238 | * stop the queue now, we will not get any more packets, and any |
| 239 | * that might be being processed will wait for us here, thereby |
| 240 | * guaranteeing that no packets go to the tid_tx pending queue any |
| 241 | * more. |
| 242 | */ |
| 243 | |
| 244 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
| 245 | |
| 246 | /* future packets must not find the tid_tx struct any more */ |
| 247 | ieee80211_assign_tid_tx(sta, tid, NULL); |
| 248 | |
| 249 | ieee80211_agg_splice_finish(sta->sdata, tid); |
| 250 | |
| 251 | kfree_rcu(tid_tx, rcu_head); |
| 252 | } |
| 253 | |
Johannes Berg | 67c282c | 2010-06-10 10:21:43 +0200 | [diff] [blame] | 254 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
Johannes Berg | c82c4a8 | 2012-07-18 13:31:31 +0200 | [diff] [blame] | 255 | enum ieee80211_agg_stop_reason reason) |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 256 | { |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 257 | struct ieee80211_local *local = sta->local; |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 258 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 259 | enum ieee80211_ampdu_mlme_action action; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 260 | int ret; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 261 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 262 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 263 | |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 264 | switch (reason) { |
| 265 | case AGG_STOP_DECLINED: |
| 266 | case AGG_STOP_LOCAL_REQUEST: |
| 267 | case AGG_STOP_PEER_REQUEST: |
| 268 | action = IEEE80211_AMPDU_TX_STOP_CONT; |
| 269 | break; |
| 270 | case AGG_STOP_DESTROY_STA: |
| 271 | action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
| 272 | break; |
| 273 | default: |
| 274 | WARN_ON_ONCE(1); |
| 275 | return -EINVAL; |
| 276 | } |
| 277 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 278 | spin_lock_bh(&sta->lock); |
| 279 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 280 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 281 | if (!tid_tx) { |
| 282 | spin_unlock_bh(&sta->lock); |
| 283 | return -ENOENT; |
| 284 | } |
| 285 | |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 286 | /* |
| 287 | * if we're already stopping ignore any new requests to stop |
| 288 | * unless we're destroying it in which case notify the driver |
| 289 | */ |
Johannes Berg | 24f50a9 | 2011-11-24 20:06:14 +0100 | [diff] [blame] | 290 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 291 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 292 | if (reason != AGG_STOP_DESTROY_STA) |
| 293 | return -EALREADY; |
| 294 | ret = drv_ampdu_action(local, sta->sdata, |
| 295 | IEEE80211_AMPDU_TX_STOP_FLUSH_CONT, |
| 296 | &sta->sta, tid, NULL, 0); |
| 297 | WARN_ON_ONCE(ret); |
Johannes Berg | 8147dc7 | 2013-01-18 23:47:05 +0100 | [diff] [blame] | 298 | return 0; |
Johannes Berg | 24f50a9 | 2011-11-24 20:06:14 +0100 | [diff] [blame] | 299 | } |
| 300 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 301 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
| 302 | /* not even started yet! */ |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 303 | ieee80211_assign_tid_tx(sta, tid, NULL); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 304 | spin_unlock_bh(&sta->lock); |
Lai Jiangshan | 0744371 | 2011-03-15 18:02:42 +0800 | [diff] [blame] | 305 | kfree_rcu(tid_tx, rcu_head); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 306 | return 0; |
| 307 | } |
| 308 | |
Johannes Berg | 24f50a9 | 2011-11-24 20:06:14 +0100 | [diff] [blame] | 309 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
| 310 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 311 | spin_unlock_bh(&sta->lock); |
| 312 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 313 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
| 314 | sta->sta.addr, tid); |
Johannes Berg | 827d42c | 2009-11-22 12:28:41 +0100 | [diff] [blame] | 315 | |
Johannes Berg | 4427148 | 2010-10-05 21:40:33 +0200 | [diff] [blame] | 316 | del_timer_sync(&tid_tx->addba_resp_timer); |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 317 | del_timer_sync(&tid_tx->session_timer); |
Johannes Berg | 4427148 | 2010-10-05 21:40:33 +0200 | [diff] [blame] | 318 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 319 | /* |
| 320 | * After this packets are no longer handed right through |
| 321 | * to the driver but are put onto tid_tx->pending instead, |
| 322 | * with locking to ensure proper access. |
| 323 | */ |
| 324 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
Vasanthakumar Thiagarajan | 736708b | 2009-06-09 14:11:46 +0530 | [diff] [blame] | 325 | |
Emmanuel Grumbach | 2a1e0fd | 2011-11-27 15:29:44 +0200 | [diff] [blame] | 326 | /* |
| 327 | * There might be a few packets being processed right now (on |
| 328 | * another CPU) that have already gotten past the aggregation |
| 329 | * check when it was still OPERATIONAL and consequently have |
| 330 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might |
| 331 | * call into the driver at the same time or even before the |
| 332 | * TX paths calls into it, which could confuse the driver. |
| 333 | * |
| 334 | * Wait for all currently running TX paths to finish before |
| 335 | * telling the driver. New packets will not go through since |
| 336 | * the aggregation session is no longer OPERATIONAL. |
| 337 | */ |
| 338 | synchronize_net(); |
| 339 | |
Johannes Berg | c82c4a8 | 2012-07-18 13:31:31 +0200 | [diff] [blame] | 340 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
| 341 | WLAN_BACK_RECIPIENT : |
| 342 | WLAN_BACK_INITIATOR; |
| 343 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 344 | |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 345 | ret = drv_ampdu_action(local, sta->sdata, action, |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 346 | &sta->sta, tid, NULL, 0); |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 347 | |
| 348 | /* HW shall not deny going back to legacy */ |
| 349 | if (WARN_ON(ret)) { |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 350 | /* |
| 351 | * We may have pending packets get stuck in this case... |
| 352 | * Not bothering with a workaround for now. |
| 353 | */ |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 354 | } |
| 355 | |
Johannes Berg | 8147dc7 | 2013-01-18 23:47:05 +0100 | [diff] [blame] | 356 | /* |
| 357 | * In the case of AGG_STOP_DESTROY_STA, the driver won't |
| 358 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may |
| 359 | * seem like we can leave the tid_tx data pending forever. |
| 360 | * This is true, in a way, but "forever" is only until the |
| 361 | * station struct is actually destroyed. In the meantime, |
| 362 | * leaving it around ensures that we don't transmit packets |
| 363 | * to the driver on this TID which might confuse it. |
| 364 | */ |
Johannes Berg | 18b559d | 2012-07-18 13:51:25 +0200 | [diff] [blame] | 365 | |
| 366 | return 0; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 367 | } |
| 368 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 369 | /* |
| 370 | * After sending add Block Ack request we activated a timer until |
| 371 | * add Block Ack response will arrive from the recipient. |
| 372 | * If this timer expires sta_addba_resp_timer_expired will be executed. |
| 373 | */ |
| 374 | static void sta_addba_resp_timer_expired(unsigned long data) |
| 375 | { |
| 376 | /* not an elegant detour, but there is no choice as the timer passes |
| 377 | * only one argument, and both sta_info and TID are needed, so init |
| 378 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 379 | * array gives the sta through container_of */ |
| 380 | u16 tid = *(u8 *)data; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 381 | struct sta_info *sta = container_of((void *)data, |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 382 | struct sta_info, timer_to_tid[tid]); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 383 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 384 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 385 | /* check if the TID waits for addBA response */ |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 386 | rcu_read_lock(); |
| 387 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 388 | if (!tid_tx || |
| 389 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 390 | rcu_read_unlock(); |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 391 | ht_dbg(sta->sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 392 | "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n", |
| 393 | sta->sta.addr, tid); |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 394 | return; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 395 | } |
| 396 | |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 397 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
| 398 | sta->sta.addr, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 399 | |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 400 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| 401 | rcu_read_unlock(); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 402 | } |
| 403 | |
Johannes Berg | 67c282c | 2010-06-10 10:21:43 +0200 | [diff] [blame] | 404 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 405 | { |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 406 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 407 | struct ieee80211_local *local = sta->local; |
| 408 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 409 | u16 start_seq_num; |
| 410 | int ret; |
| 411 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 412 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 413 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 414 | /* |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 415 | * Start queuing up packets for this aggregation session. |
| 416 | * We're going to release them once the driver is OK with |
| 417 | * that. |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 418 | */ |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 419 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| 420 | |
| 421 | /* |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 422 | * Make sure no packets are being processed. This ensures that |
| 423 | * we have a valid starting sequence number and that in-flight |
| 424 | * packets have been flushed out and no packets for this TID |
| 425 | * will go into the driver during the ampdu_action call. |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 426 | */ |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 427 | synchronize_net(); |
| 428 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 429 | start_seq_num = sta->tid_seq[tid] >> 4; |
| 430 | |
| 431 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 432 | &sta->sta, tid, &start_seq_num, 0); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 433 | if (ret) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 434 | ht_dbg(sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 435 | "BA request denied - HW unavailable for %pM tid %d\n", |
| 436 | sta->sta.addr, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 437 | spin_lock_bh(&sta->lock); |
Johannes Berg | 3a25a8c | 2012-04-03 16:28:50 +0200 | [diff] [blame] | 438 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 439 | ieee80211_assign_tid_tx(sta, tid, NULL); |
Johannes Berg | 3a25a8c | 2012-04-03 16:28:50 +0200 | [diff] [blame] | 440 | ieee80211_agg_splice_finish(sdata, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 441 | spin_unlock_bh(&sta->lock); |
| 442 | |
Lai Jiangshan | 0744371 | 2011-03-15 18:02:42 +0800 | [diff] [blame] | 443 | kfree_rcu(tid_tx, rcu_head); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 444 | return; |
| 445 | } |
| 446 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 447 | /* activate the timer for the recipient's addBA response */ |
| 448 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 449 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
| 450 | sta->sta.addr, tid); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 451 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 452 | spin_lock_bh(&sta->lock); |
Nikolay Martynov | 84381b4 | 2011-12-17 19:39:35 -0500 | [diff] [blame] | 453 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 454 | sta->ampdu_mlme.addba_req_num[tid]++; |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 455 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 456 | |
| 457 | /* send AddBA request */ |
| 458 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, |
| 459 | tid_tx->dialog_token, start_seq_num, |
Johannes Berg | 5dd36bc | 2011-01-18 13:52:23 +0100 | [diff] [blame] | 460 | local->hw.max_tx_aggregation_subframes, |
| 461 | tid_tx->timeout); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 462 | } |
| 463 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 464 | /* |
| 465 | * After accepting the AddBA Response we activated a timer, |
| 466 | * resetting it after each frame that we send. |
| 467 | */ |
| 468 | static void sta_tx_agg_session_timer_expired(unsigned long data) |
| 469 | { |
| 470 | /* not an elegant detour, but there is no choice as the timer passes |
| 471 | * only one argument, and various sta_info are needed here, so init |
| 472 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 473 | * array gives the sta through container_of */ |
| 474 | u8 *ptid = (u8 *)data; |
| 475 | u8 *timer_to_id = ptid - *ptid; |
| 476 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
| 477 | timer_to_tid[0]); |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 478 | struct tid_ampdu_tx *tid_tx; |
| 479 | unsigned long timeout; |
| 480 | |
Johannes Berg | 9e73dee | 2012-05-07 17:57:36 +0200 | [diff] [blame] | 481 | rcu_read_lock(); |
| 482 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); |
| 483 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 484 | rcu_read_unlock(); |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 485 | return; |
Johannes Berg | 9e73dee | 2012-05-07 17:57:36 +0200 | [diff] [blame] | 486 | } |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 487 | |
| 488 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); |
| 489 | if (time_is_after_jiffies(timeout)) { |
| 490 | mod_timer(&tid_tx->session_timer, timeout); |
Johannes Berg | 9e73dee | 2012-05-07 17:57:36 +0200 | [diff] [blame] | 491 | rcu_read_unlock(); |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 492 | return; |
| 493 | } |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 494 | |
Johannes Berg | 9e73dee | 2012-05-07 17:57:36 +0200 | [diff] [blame] | 495 | rcu_read_unlock(); |
| 496 | |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 497 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
| 498 | sta->sta.addr, (u16)*ptid); |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 499 | |
| 500 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); |
| 501 | } |
| 502 | |
Sujith Manoharan | bd2ce6e | 2010-12-15 07:47:10 +0530 | [diff] [blame] | 503 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| 504 | u16 timeout) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 505 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 506 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 507 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 508 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 509 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | e4e72fb | 2009-03-23 17:28:42 +0100 | [diff] [blame] | 510 | int ret = 0; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 511 | |
Liad Kaufman | b6da911 | 2014-11-19 13:47:38 +0200 | [diff] [blame] | 512 | if (WARN(sta->reserved_tid == tid, |
| 513 | "Requested to start BA session on reserved tid=%d", tid)) |
| 514 | return -EINVAL; |
| 515 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 516 | trace_api_start_tx_ba_session(pubsta, tid); |
| 517 | |
Chaitanya | 50c16e2 | 2012-12-07 12:19:34 +0530 | [diff] [blame] | 518 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 519 | return -EINVAL; |
| 520 | |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 521 | if ((tid >= IEEE80211_NUM_TIDS) || |
Arik Nemtsov | edf6b78 | 2011-08-30 09:32:38 +0300 | [diff] [blame] | 522 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
| 523 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 524 | return -EINVAL; |
| 525 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 526 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
| 527 | pubsta->addr, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 528 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 529 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
Thomas Pedersen | ae2772b | 2011-10-26 14:47:29 -0700 | [diff] [blame] | 530 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 531 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
Alexander Simon | 13c40c5 | 2011-11-30 16:56:34 +0100 | [diff] [blame] | 532 | sdata->vif.type != NL80211_IFTYPE_AP && |
| 533 | sdata->vif.type != NL80211_IFTYPE_ADHOC) |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 534 | return -EINVAL; |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 535 | |
Johannes Berg | c2c98fd | 2011-09-29 16:04:36 +0200 | [diff] [blame] | 536 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 537 | ht_dbg(sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 538 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
| 539 | sta->sta.addr, tid); |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 540 | return -EINVAL; |
Sujith | 722f069 | 2009-03-17 08:50:06 +0530 | [diff] [blame] | 541 | } |
| 542 | |
Simon Wunderlich | ff3cc5f | 2011-11-30 16:56:33 +0100 | [diff] [blame] | 543 | /* |
| 544 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a |
| 545 | * member of an IBSS, and has no other existing Block Ack agreement |
| 546 | * with the recipient STA, then the initiating STA shall transmit a |
| 547 | * Probe Request frame to the recipient STA and shall not transmit an |
| 548 | * ADDBA Request frame unless it receives a Probe Response frame |
| 549 | * from the recipient within dot11ADDBAFailureTimeout. |
| 550 | * |
| 551 | * The probe request mechanism for ADDBA is currently not implemented, |
| 552 | * but we only build up Block Ack session with HT STAs. This information |
| 553 | * is set when we receive a bss info from a probe response or a beacon. |
| 554 | */ |
| 555 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && |
| 556 | !sta->sta.ht_cap.ht_supported) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 557 | ht_dbg(sdata, |
| 558 | "BA request denied - IBSS STA %pM does not advertise HT support\n", |
| 559 | pubsta->addr); |
Simon Wunderlich | ff3cc5f | 2011-11-30 16:56:33 +0100 | [diff] [blame] | 560 | return -EINVAL; |
| 561 | } |
| 562 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 563 | spin_lock_bh(&sta->lock); |
| 564 | |
| 565 | /* we have tried too many times, receiver does not want A-MPDU */ |
| 566 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { |
| 567 | ret = -EBUSY; |
| 568 | goto err_unlock_sta; |
| 569 | } |
| 570 | |
Nikolay Martynov | 84381b4 | 2011-12-17 19:39:35 -0500 | [diff] [blame] | 571 | /* |
| 572 | * if we have tried more than HT_AGG_BURST_RETRIES times we |
| 573 | * will spread our requests in time to avoid stalling connection |
| 574 | * for too long |
| 575 | */ |
| 576 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && |
| 577 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + |
| 578 | HT_AGG_RETRIES_PERIOD)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 579 | ht_dbg(sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 580 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
| 581 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); |
Nikolay Martynov | 84381b4 | 2011-12-17 19:39:35 -0500 | [diff] [blame] | 582 | ret = -EBUSY; |
| 583 | goto err_unlock_sta; |
| 584 | } |
| 585 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 586 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 587 | /* check if the TID is not in aggregation flow already */ |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 588 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 589 | ht_dbg(sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 590 | "BA request denied - session is not idle on %pM tid %u\n", |
| 591 | sta->sta.addr, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 592 | ret = -EAGAIN; |
| 593 | goto err_unlock_sta; |
| 594 | } |
| 595 | |
| 596 | /* prepare A-MPDU MLME for Tx aggregation */ |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 597 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| 598 | if (!tid_tx) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 599 | ret = -ENOMEM; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 600 | goto err_unlock_sta; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 601 | } |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 602 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 603 | skb_queue_head_init(&tid_tx->pending); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 604 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 605 | |
Sujith Manoharan | bd2ce6e | 2010-12-15 07:47:10 +0530 | [diff] [blame] | 606 | tid_tx->timeout = timeout; |
| 607 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 608 | /* response timer */ |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 609 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
| 610 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| 611 | init_timer(&tid_tx->addba_resp_timer); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 612 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 613 | /* tx timer */ |
| 614 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; |
| 615 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 616 | init_timer_deferrable(&tid_tx->session_timer); |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 617 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 618 | /* assign a dialog token */ |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 619 | sta->ampdu_mlme.dialog_token_allocator++; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 620 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 621 | |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 622 | /* |
| 623 | * Finally, assign it to the start array; the work item will |
| 624 | * collect it and move it to the normal array. |
| 625 | */ |
| 626 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 627 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 628 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
Johannes Berg | 51a0d38 | 2010-05-31 12:00:12 +0200 | [diff] [blame] | 629 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 630 | /* this flow continues off the work */ |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 631 | err_unlock_sta: |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 632 | spin_unlock_bh(&sta->lock); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 633 | return ret; |
| 634 | } |
| 635 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| 636 | |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 637 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| 638 | struct sta_info *sta, u16 tid) |
| 639 | { |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 640 | struct tid_ampdu_tx *tid_tx; |
| 641 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 642 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 643 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 644 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 645 | |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 646 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
| 647 | sta->sta.addr, tid); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 648 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 649 | drv_ampdu_action(local, sta->sdata, |
| 650 | IEEE80211_AMPDU_TX_OPERATIONAL, |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 651 | &sta->sta, tid, NULL, tid_tx->buf_size); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 652 | |
| 653 | /* |
| 654 | * synchronize with TX path, while splicing the TX path |
| 655 | * should block so it won't put more packets onto pending. |
| 656 | */ |
| 657 | spin_lock_bh(&sta->lock); |
| 658 | |
Johannes Berg | 3a25a8c | 2012-04-03 16:28:50 +0200 | [diff] [blame] | 659 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 660 | /* |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 661 | * Now mark as operational. This will be visible |
| 662 | * in the TX path, and lets it go lock-free in |
| 663 | * the common case. |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 664 | */ |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 665 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
Johannes Berg | 3a25a8c | 2012-04-03 16:28:50 +0200 | [diff] [blame] | 666 | ieee80211_agg_splice_finish(sta->sdata, tid); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 667 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 668 | spin_unlock_bh(&sta->lock); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 669 | } |
| 670 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 671 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 672 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 673 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 674 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 675 | struct sta_info *sta; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 676 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 677 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 678 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
| 679 | |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 680 | if (tid >= IEEE80211_NUM_TIDS) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 681 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 682 | tid, IEEE80211_NUM_TIDS); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 683 | return; |
| 684 | } |
| 685 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 686 | mutex_lock(&local->sta_mtx); |
Felix Fietkau | bc192f8 | 2011-11-23 21:09:49 +0700 | [diff] [blame] | 687 | sta = sta_info_get_bss(sdata, ra); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 688 | if (!sta) { |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 689 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 690 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 691 | return; |
| 692 | } |
| 693 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 694 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 695 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 696 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 697 | if (WARN_ON(!tid_tx)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 698 | ht_dbg(sdata, "addBA was not requested!\n"); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 699 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 700 | } |
| 701 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 702 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 703 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 704 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 705 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 706 | ieee80211_agg_tx_operational(local, sta, tid); |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 707 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 708 | unlock: |
| 709 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 710 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 711 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 712 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 713 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 714 | const u8 *ra, u16 tid) |
| 715 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 716 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 717 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 718 | struct ieee80211_ra_tid *ra_tid; |
| 719 | struct sk_buff *skb = dev_alloc_skb(0); |
| 720 | |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 721 | if (unlikely(!skb)) |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 722 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 723 | |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 724 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 725 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 726 | ra_tid->tid = tid; |
| 727 | |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 728 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
| 729 | skb_queue_tail(&sdata->skb_queue, skb); |
| 730 | ieee80211_queue_work(&local->hw, &sdata->work); |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 731 | } |
| 732 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| 733 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 734 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
Johannes Berg | c82c4a8 | 2012-07-18 13:31:31 +0200 | [diff] [blame] | 735 | enum ieee80211_agg_stop_reason reason) |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 736 | { |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 737 | int ret; |
| 738 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 739 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 740 | |
Johannes Berg | c82c4a8 | 2012-07-18 13:31:31 +0200 | [diff] [blame] | 741 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 742 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 743 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 744 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 745 | return ret; |
| 746 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 747 | |
Johannes Berg | 6a8579d | 2010-05-27 14:41:07 +0200 | [diff] [blame] | 748 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 749 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 750 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 751 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 752 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 753 | struct tid_ampdu_tx *tid_tx; |
| 754 | int ret = 0; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 755 | |
Johannes Berg | 6a8579d | 2010-05-27 14:41:07 +0200 | [diff] [blame] | 756 | trace_api_stop_tx_ba_session(pubsta, tid); |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 757 | |
Johannes Berg | 4253119 | 2009-11-20 09:15:51 +0100 | [diff] [blame] | 758 | if (!local->ops->ampdu_action) |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 759 | return -EINVAL; |
| 760 | |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 761 | if (tid >= IEEE80211_NUM_TIDS) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 762 | return -EINVAL; |
| 763 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 764 | spin_lock_bh(&sta->lock); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 765 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 766 | |
| 767 | if (!tid_tx) { |
| 768 | ret = -ENOENT; |
| 769 | goto unlock; |
| 770 | } |
| 771 | |
Liad Kaufman | b6da911 | 2014-11-19 13:47:38 +0200 | [diff] [blame] | 772 | WARN(sta->reserved_tid == tid, |
| 773 | "Requested to stop BA session on reserved tid=%d", tid); |
| 774 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 775 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 776 | /* already in progress stopping it */ |
| 777 | ret = 0; |
| 778 | goto unlock; |
| 779 | } |
| 780 | |
| 781 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); |
| 782 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| 783 | |
| 784 | unlock: |
| 785 | spin_unlock_bh(&sta->lock); |
| 786 | return ret; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 787 | } |
| 788 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| 789 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 790 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 791 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 792 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 793 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 794 | struct sta_info *sta; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 795 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 796 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 797 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
| 798 | |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 799 | if (tid >= IEEE80211_NUM_TIDS) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 800 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
Johannes Berg | 5a306f5 | 2012-11-14 23:22:21 +0100 | [diff] [blame] | 801 | tid, IEEE80211_NUM_TIDS); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 802 | return; |
| 803 | } |
| 804 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 805 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 806 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 807 | mutex_lock(&local->sta_mtx); |
| 808 | |
Felix Fietkau | bc192f8 | 2011-11-23 21:09:49 +0700 | [diff] [blame] | 809 | sta = sta_info_get_bss(sdata, ra); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 810 | if (!sta) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 811 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 812 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 813 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 814 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 815 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 816 | spin_lock_bh(&sta->lock); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 817 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 818 | |
| 819 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 820 | ht_dbg(sdata, |
| 821 | "unexpected callback to A-MPDU stop for %pM tid %d\n", |
| 822 | sta->sta.addr, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 823 | goto unlock_sta; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 824 | } |
| 825 | |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 826 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 827 | ieee80211_send_delba(sta->sdata, ra, tid, |
| 828 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| 829 | |
Johannes Berg | faec12e | 2012-07-18 14:12:44 +0200 | [diff] [blame] | 830 | ieee80211_remove_tid_tx(sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 831 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 832 | unlock_sta: |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 833 | spin_unlock_bh(&sta->lock); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 834 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 835 | unlock: |
| 836 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 837 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 838 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 839 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 840 | const u8 *ra, u16 tid) |
| 841 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 842 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 843 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 844 | struct ieee80211_ra_tid *ra_tid; |
| 845 | struct sk_buff *skb = dev_alloc_skb(0); |
| 846 | |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 847 | if (unlikely(!skb)) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 848 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 849 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 850 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 851 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 852 | ra_tid->tid = tid; |
| 853 | |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 854 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
| 855 | skb_queue_tail(&sdata->skb_queue, skb); |
| 856 | ieee80211_queue_work(&local->hw, &sdata->work); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 857 | } |
| 858 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| 859 | |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 860 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 861 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| 862 | struct sta_info *sta, |
| 863 | struct ieee80211_mgmt *mgmt, |
| 864 | size_t len) |
| 865 | { |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 866 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 867 | u16 capab, tid; |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 868 | u8 buf_size; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 869 | |
| 870 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| 871 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 872 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 873 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 874 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 875 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 876 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 877 | if (!tid_tx) |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 878 | goto out; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 879 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 880 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 881 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
| 882 | sta->sta.addr, tid); |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 883 | goto out; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 884 | } |
| 885 | |
Nikolay Martynov | d305a65 | 2011-11-28 09:18:00 +0100 | [diff] [blame] | 886 | del_timer_sync(&tid_tx->addba_resp_timer); |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 887 | |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 888 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
| 889 | sta->sta.addr, tid); |
Nikolay Martynov | d305a65 | 2011-11-28 09:18:00 +0100 | [diff] [blame] | 890 | |
| 891 | /* |
| 892 | * addba_resp_timer may have fired before we got here, and |
| 893 | * caused WANT_STOP to be set. If the stop then was already |
| 894 | * processed further, STOPPING might be set. |
| 895 | */ |
| 896 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || |
| 897 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 898 | ht_dbg(sta->sdata, |
Johannes Berg | 0a214d3 | 2013-01-16 10:39:44 +0100 | [diff] [blame] | 899 | "got addBA resp for %pM tid %d but we already gave up\n", |
| 900 | sta->sta.addr, tid); |
Nikolay Martynov | d305a65 | 2011-11-28 09:18:00 +0100 | [diff] [blame] | 901 | goto out; |
| 902 | } |
| 903 | |
Helmut Schaa | 3ca9788 | 2011-07-26 12:18:27 +0200 | [diff] [blame] | 904 | /* |
| 905 | * IEEE 802.11-2007 7.3.1.14: |
| 906 | * In an ADDBA Response frame, when the Status Code field |
| 907 | * is set to 0, the Buffer Size subfield is set to a value |
| 908 | * of at least 1. |
| 909 | */ |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 910 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
Helmut Schaa | 3ca9788 | 2011-07-26 12:18:27 +0200 | [diff] [blame] | 911 | == WLAN_STATUS_SUCCESS && buf_size) { |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 912 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
| 913 | &tid_tx->state)) { |
| 914 | /* ignore duplicate response */ |
| 915 | goto out; |
| 916 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 917 | |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 918 | tid_tx->buf_size = buf_size; |
| 919 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 920 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 921 | ieee80211_agg_tx_operational(local, sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 922 | |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 923 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 924 | |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 925 | if (tid_tx->timeout) { |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 926 | mod_timer(&tid_tx->session_timer, |
| 927 | TU_TO_EXP_TIME(tid_tx->timeout)); |
Felix Fietkau | 12d3952f | 2012-03-18 22:58:06 +0100 | [diff] [blame] | 928 | tid_tx->last_tx = jiffies; |
| 929 | } |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 930 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 931 | } else { |
Johannes Berg | c82c4a8 | 2012-07-18 13:31:31 +0200 | [diff] [blame] | 932 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 933 | } |
Johannes Berg | 2171abc | 2009-10-29 08:34:00 +0100 | [diff] [blame] | 934 | |
Johannes Berg | 2171abc | 2009-10-29 08:34:00 +0100 | [diff] [blame] | 935 | out: |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 936 | mutex_unlock(&sta->ampdu_mlme.mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 937 | } |