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 | |
Helmut Schaa | cf6bb79 | 2011-12-15 10:18:34 +0100 | [diff] [blame] | 110 | ieee80211_tx_skb_tid(sdata, skb, tid); |
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 | |
Johannes Berg | 62ae67b | 2009-11-18 18:42:05 +0100 | [diff] [blame] | 138 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
Helmut Schaa | cf6bb79 | 2011-12-15 10:18:34 +0100 | [diff] [blame] | 139 | ieee80211_tx_skb_tid(sdata, skb, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 140 | } |
Felix Fietkau | 8c77124 | 2011-08-20 15:53:55 +0200 | [diff] [blame] | 141 | EXPORT_SYMBOL(ieee80211_send_bar); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 142 | |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 143 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
| 144 | struct tid_ampdu_tx *tid_tx) |
| 145 | { |
| 146 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| 147 | lockdep_assert_held(&sta->lock); |
| 148 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
| 149 | } |
| 150 | |
Johannes Berg | 67c282c | 2010-06-10 10:21:43 +0200 | [diff] [blame] | 151 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 152 | enum ieee80211_back_parties initiator, |
| 153 | bool tx) |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 154 | { |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 155 | struct ieee80211_local *local = sta->local; |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 156 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 157 | int ret; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 158 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 159 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 160 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 161 | spin_lock_bh(&sta->lock); |
| 162 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 163 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 164 | if (!tid_tx) { |
| 165 | spin_unlock_bh(&sta->lock); |
| 166 | return -ENOENT; |
| 167 | } |
| 168 | |
Johannes Berg | 24f50a9 | 2011-11-24 20:06:14 +0100 | [diff] [blame] | 169 | /* if we're already stopping ignore any new requests to stop */ |
| 170 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 171 | spin_unlock_bh(&sta->lock); |
| 172 | return -EALREADY; |
| 173 | } |
| 174 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 175 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
| 176 | /* not even started yet! */ |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 177 | ieee80211_assign_tid_tx(sta, tid, NULL); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 178 | spin_unlock_bh(&sta->lock); |
Lai Jiangshan | 0744371 | 2011-03-15 18:02:42 +0800 | [diff] [blame] | 179 | kfree_rcu(tid_tx, rcu_head); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 180 | return 0; |
| 181 | } |
| 182 | |
Johannes Berg | 24f50a9 | 2011-11-24 20:06:14 +0100 | [diff] [blame] | 183 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
| 184 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 185 | spin_unlock_bh(&sta->lock); |
| 186 | |
Johannes Berg | 827d42c | 2009-11-22 12:28:41 +0100 | [diff] [blame] | 187 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 188 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", |
| 189 | sta->sta.addr, tid); |
| 190 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 191 | |
Johannes Berg | 4427148 | 2010-10-05 21:40:33 +0200 | [diff] [blame] | 192 | del_timer_sync(&tid_tx->addba_resp_timer); |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 193 | del_timer_sync(&tid_tx->session_timer); |
Johannes Berg | 4427148 | 2010-10-05 21:40:33 +0200 | [diff] [blame] | 194 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 195 | /* |
| 196 | * After this packets are no longer handed right through |
| 197 | * to the driver but are put onto tid_tx->pending instead, |
| 198 | * with locking to ensure proper access. |
| 199 | */ |
| 200 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
Vasanthakumar Thiagarajan | 736708b | 2009-06-09 14:11:46 +0530 | [diff] [blame] | 201 | |
Emmanuel Grumbach | 2a1e0fd | 2011-11-27 15:29:44 +0200 | [diff] [blame] | 202 | /* |
| 203 | * There might be a few packets being processed right now (on |
| 204 | * another CPU) that have already gotten past the aggregation |
| 205 | * check when it was still OPERATIONAL and consequently have |
| 206 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might |
| 207 | * call into the driver at the same time or even before the |
| 208 | * TX paths calls into it, which could confuse the driver. |
| 209 | * |
| 210 | * Wait for all currently running TX paths to finish before |
| 211 | * telling the driver. New packets will not go through since |
| 212 | * the aggregation session is no longer OPERATIONAL. |
| 213 | */ |
| 214 | synchronize_net(); |
| 215 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 216 | tid_tx->stop_initiator = initiator; |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 217 | tid_tx->tx_stop = tx; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 218 | |
Johannes Berg | 12375ef | 2009-11-25 20:30:31 +0100 | [diff] [blame] | 219 | ret = drv_ampdu_action(local, sta->sdata, |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 220 | IEEE80211_AMPDU_TX_STOP, |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 221 | &sta->sta, tid, NULL, 0); |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 222 | |
| 223 | /* HW shall not deny going back to legacy */ |
| 224 | if (WARN_ON(ret)) { |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 225 | /* |
| 226 | * We may have pending packets get stuck in this case... |
| 227 | * Not bothering with a workaround for now. |
| 228 | */ |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | return ret; |
| 232 | } |
| 233 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 234 | /* |
| 235 | * After sending add Block Ack request we activated a timer until |
| 236 | * add Block Ack response will arrive from the recipient. |
| 237 | * If this timer expires sta_addba_resp_timer_expired will be executed. |
| 238 | */ |
| 239 | static void sta_addba_resp_timer_expired(unsigned long data) |
| 240 | { |
| 241 | /* not an elegant detour, but there is no choice as the timer passes |
| 242 | * only one argument, and both sta_info and TID are needed, so init |
| 243 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 244 | * array gives the sta through container_of */ |
| 245 | u16 tid = *(u8 *)data; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 246 | struct sta_info *sta = container_of((void *)data, |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 247 | struct sta_info, timer_to_tid[tid]); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 248 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 249 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 250 | /* check if the TID waits for addBA response */ |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 251 | rcu_read_lock(); |
| 252 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 253 | if (!tid_tx || |
| 254 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 255 | rcu_read_unlock(); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 256 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 257 | printk(KERN_DEBUG "timer expired on tid %d but we are not " |
Johannes Berg | 67e0f39 | 2010-04-19 11:03:13 +0200 | [diff] [blame] | 258 | "(or no longer) expecting addBA response there\n", |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 259 | tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 260 | #endif |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 261 | return; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 265 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); |
| 266 | #endif |
| 267 | |
Johannes Berg | 83a5cbf | 2010-06-10 10:21:47 +0200 | [diff] [blame] | 268 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| 269 | rcu_read_unlock(); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 270 | } |
| 271 | |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 272 | static inline int ieee80211_ac_from_tid(int tid) |
| 273 | { |
| 274 | return ieee802_1d_to_ac[tid & 7]; |
| 275 | } |
| 276 | |
Johannes Berg | a6a67db | 2010-06-10 10:21:41 +0200 | [diff] [blame] | 277 | /* |
| 278 | * When multiple aggregation sessions on multiple stations |
| 279 | * are being created/destroyed simultaneously, we need to |
| 280 | * refcount the global queue stop caused by that in order |
| 281 | * to not get into a situation where one of the aggregation |
| 282 | * setup or teardown re-enables queues before the other is |
| 283 | * ready to handle that. |
| 284 | * |
| 285 | * These two functions take care of this issue by keeping |
| 286 | * a global "agg_queue_stop" refcount. |
| 287 | */ |
| 288 | static void __acquires(agg_queue) |
| 289 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) |
| 290 | { |
| 291 | int queue = ieee80211_ac_from_tid(tid); |
| 292 | |
| 293 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) |
| 294 | ieee80211_stop_queue_by_reason( |
| 295 | &local->hw, queue, |
| 296 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| 297 | __acquire(agg_queue); |
| 298 | } |
| 299 | |
| 300 | static void __releases(agg_queue) |
| 301 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) |
| 302 | { |
| 303 | int queue = ieee80211_ac_from_tid(tid); |
| 304 | |
| 305 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) |
| 306 | ieee80211_wake_queue_by_reason( |
| 307 | &local->hw, queue, |
| 308 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| 309 | __release(agg_queue); |
| 310 | } |
| 311 | |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 312 | /* |
| 313 | * splice packets from the STA's pending to the local pending, |
| 314 | * requires a call to ieee80211_agg_splice_finish later |
| 315 | */ |
| 316 | static void __acquires(agg_queue) |
| 317 | ieee80211_agg_splice_packets(struct ieee80211_local *local, |
| 318 | struct tid_ampdu_tx *tid_tx, u16 tid) |
| 319 | { |
| 320 | int queue = ieee80211_ac_from_tid(tid); |
| 321 | unsigned long flags; |
| 322 | |
| 323 | ieee80211_stop_queue_agg(local, tid); |
| 324 | |
| 325 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
| 326 | " from the pending queue\n", tid)) |
| 327 | return; |
| 328 | |
| 329 | if (!skb_queue_empty(&tid_tx->pending)) { |
| 330 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| 331 | /* copy over remaining packets */ |
| 332 | skb_queue_splice_tail_init(&tid_tx->pending, |
| 333 | &local->pending[queue]); |
| 334 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | static void __releases(agg_queue) |
| 339 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) |
| 340 | { |
| 341 | ieee80211_wake_queue_agg(local, tid); |
| 342 | } |
| 343 | |
Johannes Berg | 67c282c | 2010-06-10 10:21:43 +0200 | [diff] [blame] | 344 | 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] | 345 | { |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 346 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 347 | struct ieee80211_local *local = sta->local; |
| 348 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 349 | u16 start_seq_num; |
| 350 | int ret; |
| 351 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 352 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 353 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 354 | /* |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 355 | * Start queuing up packets for this aggregation session. |
| 356 | * We're going to release them once the driver is OK with |
| 357 | * that. |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 358 | */ |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 359 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| 360 | |
| 361 | /* |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 362 | * Make sure no packets are being processed. This ensures that |
| 363 | * we have a valid starting sequence number and that in-flight |
| 364 | * packets have been flushed out and no packets for this TID |
| 365 | * will go into the driver during the ampdu_action call. |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 366 | */ |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 367 | synchronize_net(); |
| 368 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 369 | start_seq_num = sta->tid_seq[tid] >> 4; |
| 370 | |
| 371 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 372 | &sta->sta, tid, &start_seq_num, 0); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 373 | if (ret) { |
| 374 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 375 | printk(KERN_DEBUG "BA request denied - HW unavailable for" |
| 376 | " tid %d\n", tid); |
| 377 | #endif |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 378 | spin_lock_bh(&sta->lock); |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 379 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 380 | ieee80211_assign_tid_tx(sta, tid, NULL); |
Johannes Berg | 15062e6 | 2011-12-07 09:02:21 +0100 | [diff] [blame] | 381 | ieee80211_agg_splice_finish(local, tid); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 382 | spin_unlock_bh(&sta->lock); |
| 383 | |
Lai Jiangshan | 0744371 | 2011-03-15 18:02:42 +0800 | [diff] [blame] | 384 | kfree_rcu(tid_tx, rcu_head); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 385 | return; |
| 386 | } |
| 387 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 388 | /* activate the timer for the recipient's addBA response */ |
| 389 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); |
| 390 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 391 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); |
| 392 | #endif |
| 393 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 394 | spin_lock_bh(&sta->lock); |
Nikolay Martynov | 84381b4 | 2011-12-17 19:39:35 -0500 | [diff] [blame] | 395 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 396 | sta->ampdu_mlme.addba_req_num[tid]++; |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 397 | spin_unlock_bh(&sta->lock); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 398 | |
| 399 | /* send AddBA request */ |
| 400 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, |
| 401 | tid_tx->dialog_token, start_seq_num, |
Johannes Berg | 5dd36bc | 2011-01-18 13:52:23 +0100 | [diff] [blame] | 402 | local->hw.max_tx_aggregation_subframes, |
| 403 | tid_tx->timeout); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 404 | } |
| 405 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 406 | /* |
| 407 | * After accepting the AddBA Response we activated a timer, |
| 408 | * resetting it after each frame that we send. |
| 409 | */ |
| 410 | static void sta_tx_agg_session_timer_expired(unsigned long data) |
| 411 | { |
| 412 | /* not an elegant detour, but there is no choice as the timer passes |
| 413 | * only one argument, and various sta_info are needed here, so init |
| 414 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
| 415 | * array gives the sta through container_of */ |
| 416 | u8 *ptid = (u8 *)data; |
| 417 | u8 *timer_to_id = ptid - *ptid; |
| 418 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
| 419 | timer_to_tid[0]); |
| 420 | |
| 421 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 422 | printk(KERN_DEBUG "tx session timer expired on tid %d\n", (u16)*ptid); |
| 423 | #endif |
| 424 | |
| 425 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); |
| 426 | } |
| 427 | |
Sujith Manoharan | bd2ce6e | 2010-12-15 07:47:10 +0530 | [diff] [blame] | 428 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| 429 | u16 timeout) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 430 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 431 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 432 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 433 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 434 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | e4e72fb | 2009-03-23 17:28:42 +0100 | [diff] [blame] | 435 | int ret = 0; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 436 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 437 | trace_api_start_tx_ba_session(pubsta, tid); |
| 438 | |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 439 | if (WARN_ON(!local->ops->ampdu_action)) |
| 440 | return -EINVAL; |
| 441 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 442 | if ((tid >= STA_TID_NUM) || |
Arik Nemtsov | edf6b78 | 2011-08-30 09:32:38 +0300 | [diff] [blame] | 443 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
| 444 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 445 | return -EINVAL; |
| 446 | |
| 447 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 448 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 449 | pubsta->addr, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 450 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 451 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 452 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
Thomas Pedersen | ae2772b | 2011-10-26 14:47:29 -0700 | [diff] [blame] | 453 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 454 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
Alexander Simon | 13c40c5 | 2011-11-30 16:56:34 +0100 | [diff] [blame] | 455 | sdata->vif.type != NL80211_IFTYPE_AP && |
| 456 | sdata->vif.type != NL80211_IFTYPE_ADHOC) |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 457 | return -EINVAL; |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 458 | |
Johannes Berg | c2c98fd | 2011-09-29 16:04:36 +0200 | [diff] [blame] | 459 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
Sujith | 722f069 | 2009-03-17 08:50:06 +0530 | [diff] [blame] | 460 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | 2a41905 | 2010-06-10 10:21:29 +0200 | [diff] [blame] | 461 | printk(KERN_DEBUG "BA sessions blocked. " |
Sujith | 722f069 | 2009-03-17 08:50:06 +0530 | [diff] [blame] | 462 | "Denying BA session request\n"); |
| 463 | #endif |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 464 | return -EINVAL; |
Sujith | 722f069 | 2009-03-17 08:50:06 +0530 | [diff] [blame] | 465 | } |
| 466 | |
Simon Wunderlich | ff3cc5f | 2011-11-30 16:56:33 +0100 | [diff] [blame] | 467 | /* |
| 468 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a |
| 469 | * member of an IBSS, and has no other existing Block Ack agreement |
| 470 | * with the recipient STA, then the initiating STA shall transmit a |
| 471 | * Probe Request frame to the recipient STA and shall not transmit an |
| 472 | * ADDBA Request frame unless it receives a Probe Response frame |
| 473 | * from the recipient within dot11ADDBAFailureTimeout. |
| 474 | * |
| 475 | * The probe request mechanism for ADDBA is currently not implemented, |
| 476 | * but we only build up Block Ack session with HT STAs. This information |
| 477 | * is set when we receive a bss info from a probe response or a beacon. |
| 478 | */ |
| 479 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && |
| 480 | !sta->sta.ht_cap.ht_supported) { |
| 481 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 482 | printk(KERN_DEBUG "BA request denied - IBSS STA %pM" |
| 483 | "does not advertise HT support\n", pubsta->addr); |
| 484 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 485 | return -EINVAL; |
| 486 | } |
| 487 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 488 | spin_lock_bh(&sta->lock); |
| 489 | |
| 490 | /* we have tried too many times, receiver does not want A-MPDU */ |
| 491 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { |
| 492 | ret = -EBUSY; |
| 493 | goto err_unlock_sta; |
| 494 | } |
| 495 | |
Nikolay Martynov | 84381b4 | 2011-12-17 19:39:35 -0500 | [diff] [blame] | 496 | /* |
| 497 | * if we have tried more than HT_AGG_BURST_RETRIES times we |
| 498 | * will spread our requests in time to avoid stalling connection |
| 499 | * for too long |
| 500 | */ |
| 501 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && |
| 502 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + |
| 503 | HT_AGG_RETRIES_PERIOD)) { |
| 504 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 505 | printk(KERN_DEBUG "BA request denied - " |
| 506 | "waiting a grace period after %d failed requests " |
| 507 | "on tid %u\n", |
| 508 | sta->ampdu_mlme.addba_req_num[tid], tid); |
| 509 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 510 | ret = -EBUSY; |
| 511 | goto err_unlock_sta; |
| 512 | } |
| 513 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 514 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 515 | /* check if the TID is not in aggregation flow already */ |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 516 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 517 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 518 | printk(KERN_DEBUG "BA request denied - session is not " |
| 519 | "idle on tid %u\n", tid); |
| 520 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 521 | ret = -EAGAIN; |
| 522 | goto err_unlock_sta; |
| 523 | } |
| 524 | |
| 525 | /* prepare A-MPDU MLME for Tx aggregation */ |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 526 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| 527 | if (!tid_tx) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 528 | ret = -ENOMEM; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 529 | goto err_unlock_sta; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 530 | } |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 531 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 532 | skb_queue_head_init(&tid_tx->pending); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 533 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 534 | |
Sujith Manoharan | bd2ce6e | 2010-12-15 07:47:10 +0530 | [diff] [blame] | 535 | tid_tx->timeout = timeout; |
| 536 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 537 | /* response timer */ |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 538 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
| 539 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| 540 | init_timer(&tid_tx->addba_resp_timer); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 541 | |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 542 | /* tx timer */ |
| 543 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; |
| 544 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| 545 | init_timer(&tid_tx->session_timer); |
| 546 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 547 | /* assign a dialog token */ |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 548 | sta->ampdu_mlme.dialog_token_allocator++; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 549 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 550 | |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 551 | /* |
| 552 | * Finally, assign it to the start array; the work item will |
| 553 | * collect it and move it to the normal array. |
| 554 | */ |
| 555 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 556 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 557 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
Johannes Berg | 51a0d38 | 2010-05-31 12:00:12 +0200 | [diff] [blame] | 558 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 559 | /* this flow continues off the work */ |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 560 | err_unlock_sta: |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 561 | spin_unlock_bh(&sta->lock); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 562 | return ret; |
| 563 | } |
| 564 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| 565 | |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 566 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| 567 | struct sta_info *sta, u16 tid) |
| 568 | { |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 569 | struct tid_ampdu_tx *tid_tx; |
| 570 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 571 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 572 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 573 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 574 | |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 575 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Frans Pop | 55f9893 | 2010-03-24 19:46:29 +0100 | [diff] [blame] | 576 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 577 | #endif |
| 578 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 579 | drv_ampdu_action(local, sta->sdata, |
| 580 | IEEE80211_AMPDU_TX_OPERATIONAL, |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 581 | &sta->sta, tid, NULL, tid_tx->buf_size); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 582 | |
| 583 | /* |
| 584 | * synchronize with TX path, while splicing the TX path |
| 585 | * should block so it won't put more packets onto pending. |
| 586 | */ |
| 587 | spin_lock_bh(&sta->lock); |
| 588 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 589 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 590 | /* |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 591 | * Now mark as operational. This will be visible |
| 592 | * in the TX path, and lets it go lock-free in |
| 593 | * the common case. |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 594 | */ |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 595 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 596 | ieee80211_agg_splice_finish(local, tid); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 597 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 598 | spin_unlock_bh(&sta->lock); |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 599 | } |
| 600 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 601 | 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] | 602 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 603 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 604 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 605 | struct sta_info *sta; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 606 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 607 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 608 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
| 609 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 610 | if (tid >= STA_TID_NUM) { |
| 611 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 612 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| 613 | tid, STA_TID_NUM); |
| 614 | #endif |
| 615 | return; |
| 616 | } |
| 617 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 618 | mutex_lock(&local->sta_mtx); |
Felix Fietkau | bc192f8 | 2011-11-23 21:09:49 +0700 | [diff] [blame] | 619 | sta = sta_info_get_bss(sdata, ra); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 620 | if (!sta) { |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 621 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 622 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 623 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| 624 | #endif |
| 625 | return; |
| 626 | } |
| 627 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 628 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 629 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 630 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 631 | if (WARN_ON(!tid_tx)) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 632 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 633 | printk(KERN_DEBUG "addBA was not requested!\n"); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 634 | #endif |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 635 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 636 | } |
| 637 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 638 | 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] | 639 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 640 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 641 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 642 | ieee80211_agg_tx_operational(local, sta, tid); |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 643 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 644 | unlock: |
| 645 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 646 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 647 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 648 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 649 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 650 | const u8 *ra, u16 tid) |
| 651 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 652 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 653 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 654 | struct ieee80211_ra_tid *ra_tid; |
| 655 | struct sk_buff *skb = dev_alloc_skb(0); |
| 656 | |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 657 | if (unlikely(!skb)) |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 658 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 659 | |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 660 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 661 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 662 | ra_tid->tid = tid; |
| 663 | |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 664 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
| 665 | skb_queue_tail(&sdata->skb_queue, skb); |
| 666 | ieee80211_queue_work(&local->hw, &sdata->work); |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 667 | } |
| 668 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| 669 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 670 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 671 | enum ieee80211_back_parties initiator, |
| 672 | bool tx) |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 673 | { |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 674 | int ret; |
| 675 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 676 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 677 | |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 678 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 679 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 680 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 681 | |
Johannes Berg | 849b796 | 2009-02-10 21:25:54 +0100 | [diff] [blame] | 682 | return ret; |
| 683 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 684 | |
Johannes Berg | 6a8579d | 2010-05-27 14:41:07 +0200 | [diff] [blame] | 685 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 686 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 687 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 688 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 689 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 690 | struct tid_ampdu_tx *tid_tx; |
| 691 | int ret = 0; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 692 | |
Johannes Berg | 6a8579d | 2010-05-27 14:41:07 +0200 | [diff] [blame] | 693 | trace_api_stop_tx_ba_session(pubsta, tid); |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 694 | |
Johannes Berg | 4253119 | 2009-11-20 09:15:51 +0100 | [diff] [blame] | 695 | if (!local->ops->ampdu_action) |
Johannes Berg | 23e6a7e | 2009-02-10 21:25:50 +0100 | [diff] [blame] | 696 | return -EINVAL; |
| 697 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 698 | if (tid >= STA_TID_NUM) |
| 699 | return -EINVAL; |
| 700 | |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 701 | spin_lock_bh(&sta->lock); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 702 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | 0ab3370 | 2010-06-10 10:21:42 +0200 | [diff] [blame] | 703 | |
| 704 | if (!tid_tx) { |
| 705 | ret = -ENOENT; |
| 706 | goto unlock; |
| 707 | } |
| 708 | |
| 709 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 710 | /* already in progress stopping it */ |
| 711 | ret = 0; |
| 712 | goto unlock; |
| 713 | } |
| 714 | |
| 715 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); |
| 716 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| 717 | |
| 718 | unlock: |
| 719 | spin_unlock_bh(&sta->lock); |
| 720 | return ret; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 721 | } |
| 722 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| 723 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 724 | 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] | 725 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 726 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 727 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 728 | struct sta_info *sta; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 729 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 730 | |
Johannes Berg | b5878a2 | 2010-04-07 16:48:40 +0200 | [diff] [blame] | 731 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
| 732 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 733 | if (tid >= STA_TID_NUM) { |
| 734 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 735 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| 736 | tid, STA_TID_NUM); |
| 737 | #endif |
| 738 | return; |
| 739 | } |
| 740 | |
| 741 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 742 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", |
| 743 | ra, tid); |
| 744 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| 745 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 746 | mutex_lock(&local->sta_mtx); |
| 747 | |
Felix Fietkau | bc192f8 | 2011-11-23 21:09:49 +0700 | [diff] [blame] | 748 | sta = sta_info_get_bss(sdata, ra); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 749 | if (!sta) { |
| 750 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 751 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| 752 | #endif |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 753 | goto unlock; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 754 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 755 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 756 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 757 | spin_lock_bh(&sta->lock); |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 758 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 759 | |
| 760 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 761 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 762 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); |
| 763 | #endif |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 764 | goto unlock_sta; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 765 | } |
| 766 | |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 767 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 768 | ieee80211_send_delba(sta->sdata, ra, tid, |
| 769 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| 770 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 771 | /* |
| 772 | * When we get here, the TX path will not be lockless any more wrt. |
| 773 | * aggregation, since the OPERATIONAL bit has long been cleared. |
| 774 | * Thus it will block on getting the lock, if it occurs. So if we |
| 775 | * stop the queue now, we will not get any more packets, and any |
| 776 | * that might be being processed will wait for us here, thereby |
| 777 | * guaranteeing that no packets go to the tid_tx pending queue any |
| 778 | * more. |
| 779 | */ |
| 780 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 781 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 782 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 783 | /* future packets must not find the tid_tx struct any more */ |
Johannes Berg | ec034b2 | 2011-05-13 13:35:40 +0200 | [diff] [blame] | 784 | ieee80211_assign_tid_tx(sta, tid, NULL); |
Johannes Berg | 96f5e66 | 2009-02-12 00:51:53 +0100 | [diff] [blame] | 785 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 786 | ieee80211_agg_splice_finish(local, tid); |
Johannes Berg | cd8ffc8 | 2009-03-23 17:28:41 +0100 | [diff] [blame] | 787 | |
Lai Jiangshan | 0744371 | 2011-03-15 18:02:42 +0800 | [diff] [blame] | 788 | kfree_rcu(tid_tx, rcu_head); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 789 | |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 790 | unlock_sta: |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 791 | spin_unlock_bh(&sta->lock); |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 792 | mutex_unlock(&sta->ampdu_mlme.mtx); |
| 793 | unlock: |
| 794 | mutex_unlock(&local->sta_mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 795 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 796 | |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 797 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 798 | const u8 *ra, u16 tid) |
| 799 | { |
Johannes Berg | c951ad3 | 2009-11-16 12:00:38 +0100 | [diff] [blame] | 800 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 801 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 802 | struct ieee80211_ra_tid *ra_tid; |
| 803 | struct sk_buff *skb = dev_alloc_skb(0); |
| 804 | |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 805 | if (unlikely(!skb)) |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 806 | return; |
Joe Perches | d15b845 | 2011-08-29 14:17:31 -0700 | [diff] [blame] | 807 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 808 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| 809 | memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| 810 | ra_tid->tid = tid; |
| 811 | |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 812 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
| 813 | skb_queue_tail(&sdata->skb_queue, skb); |
| 814 | ieee80211_queue_work(&local->hw, &sdata->work); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 815 | } |
| 816 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| 817 | |
Johannes Berg | 86ab6c5 | 2009-02-10 21:25:49 +0100 | [diff] [blame] | 818 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 819 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| 820 | struct sta_info *sta, |
| 821 | struct ieee80211_mgmt *mgmt, |
| 822 | size_t len) |
| 823 | { |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 824 | struct tid_ampdu_tx *tid_tx; |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 825 | u16 capab, tid; |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 826 | u8 buf_size; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 827 | |
| 828 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| 829 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 830 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
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 | mutex_lock(&sta->ampdu_mlme.mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 833 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 834 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 835 | if (!tid_tx) |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 836 | goto out; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 837 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 838 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 839 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 840 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 841 | #endif |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 842 | goto out; |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 843 | } |
| 844 | |
Nikolay Martynov | d305a65 | 2011-11-28 09:18:00 +0100 | [diff] [blame] | 845 | del_timer_sync(&tid_tx->addba_resp_timer); |
Johannes Berg | 8ade008 | 2009-11-18 17:15:06 +0100 | [diff] [blame] | 846 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 847 | #ifdef CONFIG_MAC80211_HT_DEBUG |
Frans Pop | 55f9893 | 2010-03-24 19:46:29 +0100 | [diff] [blame] | 848 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 849 | #endif |
Nikolay Martynov | d305a65 | 2011-11-28 09:18:00 +0100 | [diff] [blame] | 850 | |
| 851 | /* |
| 852 | * addba_resp_timer may have fired before we got here, and |
| 853 | * caused WANT_STOP to be set. If the stop then was already |
| 854 | * processed further, STOPPING might be set. |
| 855 | */ |
| 856 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || |
| 857 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 858 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 859 | printk(KERN_DEBUG |
| 860 | "got addBA resp for tid %d but we already gave up\n", |
| 861 | tid); |
| 862 | #endif |
| 863 | goto out; |
| 864 | } |
| 865 | |
Helmut Schaa | 3ca9788 | 2011-07-26 12:18:27 +0200 | [diff] [blame] | 866 | /* |
| 867 | * IEEE 802.11-2007 7.3.1.14: |
| 868 | * In an ADDBA Response frame, when the Status Code field |
| 869 | * is set to 0, the Buffer Size subfield is set to a value |
| 870 | * of at least 1. |
| 871 | */ |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 872 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
Helmut Schaa | 3ca9788 | 2011-07-26 12:18:27 +0200 | [diff] [blame] | 873 | == WLAN_STATUS_SUCCESS && buf_size) { |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 874 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
| 875 | &tid_tx->state)) { |
| 876 | /* ignore duplicate response */ |
| 877 | goto out; |
| 878 | } |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 879 | |
Johannes Berg | 0b01f03 | 2011-01-18 13:51:05 +0100 | [diff] [blame] | 880 | tid_tx->buf_size = buf_size; |
| 881 | |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 882 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 883 | ieee80211_agg_tx_operational(local, sta, tid); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 884 | |
Johannes Berg | b172023 | 2009-03-23 17:28:39 +0100 | [diff] [blame] | 885 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
Nikolay Martynov | 285fa69 | 2011-11-22 21:50:28 -0500 | [diff] [blame] | 886 | |
| 887 | if (tid_tx->timeout) |
| 888 | mod_timer(&tid_tx->session_timer, |
| 889 | TU_TO_EXP_TIME(tid_tx->timeout)); |
| 890 | |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 891 | } else { |
Johannes Berg | 53f73c0 | 2010-10-05 19:37:40 +0200 | [diff] [blame] | 892 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
| 893 | true); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 894 | } |
Johannes Berg | 2171abc | 2009-10-29 08:34:00 +0100 | [diff] [blame] | 895 | |
Johannes Berg | 2171abc | 2009-10-29 08:34:00 +0100 | [diff] [blame] | 896 | out: |
Johannes Berg | cfcdbde | 2010-06-10 10:21:48 +0200 | [diff] [blame] | 897 | mutex_unlock(&sta->ampdu_mlme.mtx); |
Johannes Berg | b8695a8 | 2009-02-10 21:25:46 +0100 | [diff] [blame] | 898 | } |