Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * This file is provided under a dual BSD/GPLv2 license. When using or |
| 4 | * redistributing this file, you may do so under either license. |
| 5 | * |
| 6 | * GPL LICENSE SUMMARY |
| 7 | * |
| 8 | * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of version 2 of the GNU General Public License as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, |
| 22 | * USA |
| 23 | * |
| 24 | * The full GNU General Public License is included in this distribution |
Emmanuel Grumbach | 410dc5a | 2013-02-18 09:22:28 +0200 | [diff] [blame] | 25 | * in the file called COPYING. |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 26 | * |
| 27 | * Contact Information: |
| 28 | * Intel Linux Wireless <ilw@linux.intel.com> |
| 29 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| 30 | * |
| 31 | * BSD LICENSE |
| 32 | * |
| 33 | * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved. |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * Redistribution and use in source and binary forms, with or without |
| 37 | * modification, are permitted provided that the following conditions |
| 38 | * are met: |
| 39 | * |
| 40 | * * Redistributions of source code must retain the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer. |
| 42 | * * Redistributions in binary form must reproduce the above copyright |
| 43 | * notice, this list of conditions and the following disclaimer in |
| 44 | * the documentation and/or other materials provided with the |
| 45 | * distribution. |
| 46 | * * Neither the name Intel Corporation nor the names of its |
| 47 | * contributors may be used to endorse or promote products derived |
| 48 | * from this software without specific prior written permission. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 51 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 52 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 53 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 54 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 55 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 56 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 57 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 58 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 59 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 60 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 61 | * |
| 62 | *****************************************************************************/ |
| 63 | |
| 64 | #include <linux/jiffies.h> |
| 65 | #include <net/mac80211.h> |
| 66 | |
| 67 | #include "iwl-notif-wait.h" |
| 68 | #include "iwl-trans.h" |
| 69 | #include "fw-api.h" |
| 70 | #include "time-event.h" |
| 71 | #include "mvm.h" |
| 72 | #include "iwl-io.h" |
| 73 | #include "iwl-prph.h" |
| 74 | |
| 75 | /* A TimeUnit is 1024 microsecond */ |
| 76 | #define TU_TO_JIFFIES(_tu) (usecs_to_jiffies((_tu) * 1024)) |
| 77 | #define MSEC_TO_TU(_msec) (_msec*1000/1024) |
| 78 | |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 79 | /* |
| 80 | * For the high priority TE use a time event type that has similar priority to |
| 81 | * the FW's action scan priority. |
Ilan Peer | 456f6dd | 2013-02-04 14:09:37 +0200 | [diff] [blame] | 82 | */ |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 83 | #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE |
| 84 | #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC |
Ilan Peer | 456f6dd | 2013-02-04 14:09:37 +0200 | [diff] [blame] | 85 | |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 86 | void iwl_mvm_te_clear_data(struct iwl_mvm *mvm, |
| 87 | struct iwl_mvm_time_event_data *te_data) |
| 88 | { |
| 89 | lockdep_assert_held(&mvm->time_event_lock); |
| 90 | |
| 91 | if (te_data->id == TE_MAX) |
| 92 | return; |
| 93 | |
| 94 | list_del(&te_data->list); |
| 95 | te_data->running = false; |
| 96 | te_data->uid = 0; |
| 97 | te_data->id = TE_MAX; |
| 98 | te_data->vif = NULL; |
| 99 | } |
| 100 | |
| 101 | void iwl_mvm_roc_done_wk(struct work_struct *wk) |
| 102 | { |
| 103 | struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk); |
| 104 | |
| 105 | synchronize_net(); |
| 106 | |
| 107 | /* |
| 108 | * Flush the offchannel queue -- this is called when the time |
| 109 | * event finishes or is cancelled, so that frames queued for it |
| 110 | * won't get stuck on the queue and be transmitted in the next |
| 111 | * time event. |
| 112 | * We have to send the command asynchronously since this cannot |
| 113 | * be under the mutex for locking reasons, but that's not an |
| 114 | * issue as it will have to complete before the next command is |
| 115 | * executed, and a new time event means a new command. |
| 116 | */ |
Ilan Peer | 398e8c6 | 2013-03-13 15:20:35 +0200 | [diff] [blame] | 117 | iwl_mvm_flush_tx_path(mvm, BIT(IWL_MVM_OFFCHANNEL_QUEUE), false); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | static void iwl_mvm_roc_finished(struct iwl_mvm *mvm) |
| 121 | { |
| 122 | /* |
| 123 | * First, clear the ROC_RUNNING status bit. This will cause the TX |
| 124 | * path to drop offchannel transmissions. That would also be done |
| 125 | * by mac80211, but it is racy, in particular in the case that the |
| 126 | * time event actually completed in the firmware (which is handled |
| 127 | * in iwl_mvm_te_handle_notif). |
| 128 | */ |
| 129 | clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); |
| 130 | |
| 131 | /* |
| 132 | * Of course, our status bit is just as racy as mac80211, so in |
| 133 | * addition, fire off the work struct which will drop all frames |
| 134 | * from the hardware queues that made it through the race. First |
| 135 | * it will of course synchronize the TX path to make sure that |
| 136 | * any *new* TX will be rejected. |
| 137 | */ |
| 138 | schedule_work(&mvm->roc_done_wk); |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Handles a FW notification for an event that is known to the driver. |
| 143 | * |
| 144 | * @mvm: the mvm component |
| 145 | * @te_data: the time event data |
| 146 | * @notif: the notification data corresponding the time event data. |
| 147 | */ |
| 148 | static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm, |
| 149 | struct iwl_mvm_time_event_data *te_data, |
| 150 | struct iwl_time_event_notif *notif) |
| 151 | { |
| 152 | lockdep_assert_held(&mvm->time_event_lock); |
| 153 | |
| 154 | IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n", |
| 155 | le32_to_cpu(notif->unique_id), |
| 156 | le32_to_cpu(notif->action)); |
| 157 | |
| 158 | /* |
| 159 | * The FW sends the start/end time event notifications even for events |
| 160 | * that it fails to schedule. This is indicated in the status field of |
| 161 | * the notification. This happens in cases that the scheduler cannot |
| 162 | * find a schedule that can handle the event (for example requesting a |
| 163 | * P2P Device discoveribility, while there are other higher priority |
| 164 | * events in the system). |
| 165 | */ |
| 166 | WARN_ONCE(!le32_to_cpu(notif->status), |
| 167 | "Failed to schedule time event\n"); |
| 168 | |
Ilan Peer | 1da80e8 | 2013-03-19 16:28:56 +0200 | [diff] [blame] | 169 | if (le32_to_cpu(notif->action) & TE_NOTIF_HOST_EVENT_END) { |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 170 | IWL_DEBUG_TE(mvm, |
| 171 | "TE ended - current time %lu, estimated end %lu\n", |
| 172 | jiffies, te_data->end_jiffies); |
| 173 | |
| 174 | if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { |
| 175 | ieee80211_remain_on_channel_expired(mvm->hw); |
| 176 | iwl_mvm_roc_finished(mvm); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * By now, we should have finished association |
| 181 | * and know the dtim period. |
| 182 | */ |
| 183 | if (te_data->vif->type == NL80211_IFTYPE_STATION && |
| 184 | (!te_data->vif->bss_conf.assoc || |
Johannes Berg | 210a544 | 2013-01-24 23:48:23 +0100 | [diff] [blame] | 185 | !te_data->vif->bss_conf.dtim_period)) { |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 186 | IWL_ERR(mvm, |
Masanari Iida | 0b1587b | 2013-07-17 04:37:44 +0900 | [diff] [blame] | 187 | "No association and the time event is over already...\n"); |
Johannes Berg | 210a544 | 2013-01-24 23:48:23 +0100 | [diff] [blame] | 188 | ieee80211_connection_loss(te_data->vif); |
| 189 | } |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 190 | |
| 191 | iwl_mvm_te_clear_data(mvm, te_data); |
Ilan Peer | 1da80e8 | 2013-03-19 16:28:56 +0200 | [diff] [blame] | 192 | } else if (le32_to_cpu(notif->action) & TE_NOTIF_HOST_EVENT_START) { |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 193 | te_data->running = true; |
| 194 | te_data->end_jiffies = jiffies + |
| 195 | TU_TO_JIFFIES(te_data->duration); |
| 196 | |
| 197 | if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { |
| 198 | set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); |
| 199 | ieee80211_ready_on_channel(mvm->hw); |
| 200 | } |
| 201 | } else { |
| 202 | IWL_WARN(mvm, "Got TE with unknown action\n"); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * The Rx handler for time event notifications |
| 208 | */ |
| 209 | int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm, |
| 210 | struct iwl_rx_cmd_buffer *rxb, |
| 211 | struct iwl_device_cmd *cmd) |
| 212 | { |
| 213 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
| 214 | struct iwl_time_event_notif *notif = (void *)pkt->data; |
| 215 | struct iwl_mvm_time_event_data *te_data, *tmp; |
| 216 | |
| 217 | IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n", |
| 218 | le32_to_cpu(notif->unique_id), |
| 219 | le32_to_cpu(notif->action)); |
| 220 | |
| 221 | spin_lock_bh(&mvm->time_event_lock); |
| 222 | list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) { |
| 223 | if (le32_to_cpu(notif->unique_id) == te_data->uid) |
| 224 | iwl_mvm_te_handle_notif(mvm, te_data, notif); |
| 225 | } |
| 226 | spin_unlock_bh(&mvm->time_event_lock); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 231 | static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait, |
| 232 | struct iwl_rx_packet *pkt, void *data) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 233 | { |
| 234 | struct iwl_mvm *mvm = |
| 235 | container_of(notif_wait, struct iwl_mvm, notif_wait); |
| 236 | struct iwl_mvm_time_event_data *te_data = data; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 237 | struct iwl_time_event_resp *resp; |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 238 | int resp_len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 239 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 240 | if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD)) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 241 | return true; |
| 242 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 243 | if (WARN_ON_ONCE(resp_len != sizeof(pkt->hdr) + sizeof(*resp))) { |
| 244 | IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n"); |
| 245 | return true; |
| 246 | } |
| 247 | |
| 248 | resp = (void *)pkt->data; |
Johannes Berg | e372282 | 2013-02-16 00:11:34 +0100 | [diff] [blame] | 249 | |
| 250 | /* we should never get a response to another TIME_EVENT_CMD here */ |
| 251 | if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id)) |
| 252 | return false; |
| 253 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 254 | te_data->uid = le32_to_cpu(resp->unique_id); |
| 255 | IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n", |
| 256 | te_data->uid); |
| 257 | return true; |
| 258 | } |
| 259 | |
| 260 | static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm, |
| 261 | struct ieee80211_vif *vif, |
| 262 | struct iwl_mvm_time_event_data *te_data, |
| 263 | struct iwl_time_event_cmd *te_cmd) |
| 264 | { |
| 265 | static const u8 time_event_response[] = { TIME_EVENT_CMD }; |
| 266 | struct iwl_notification_wait wait_time_event; |
| 267 | int ret; |
| 268 | |
| 269 | lockdep_assert_held(&mvm->mutex); |
| 270 | |
Johannes Berg | 93630dc | 2013-02-15 23:54:10 +0100 | [diff] [blame] | 271 | IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n", |
| 272 | le32_to_cpu(te_cmd->duration)); |
| 273 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 274 | spin_lock_bh(&mvm->time_event_lock); |
| 275 | if (WARN_ON(te_data->id != TE_MAX)) { |
| 276 | spin_unlock_bh(&mvm->time_event_lock); |
| 277 | return -EIO; |
| 278 | } |
| 279 | te_data->vif = vif; |
| 280 | te_data->duration = le32_to_cpu(te_cmd->duration); |
| 281 | te_data->id = le32_to_cpu(te_cmd->id); |
| 282 | list_add_tail(&te_data->list, &mvm->time_event_list); |
| 283 | spin_unlock_bh(&mvm->time_event_lock); |
| 284 | |
| 285 | /* |
| 286 | * Use a notification wait, which really just processes the |
| 287 | * command response and doesn't wait for anything, in order |
| 288 | * to be able to process the response and get the UID inside |
| 289 | * the RX path. Using CMD_WANT_SKB doesn't work because it |
| 290 | * stores the buffer and then wakes up this thread, by which |
| 291 | * time another notification (that the time event started) |
| 292 | * might already be processed unsuccessfully. |
| 293 | */ |
| 294 | iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event, |
| 295 | time_event_response, |
| 296 | ARRAY_SIZE(time_event_response), |
| 297 | iwl_mvm_time_event_response, te_data); |
| 298 | |
| 299 | ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC, |
| 300 | sizeof(*te_cmd), te_cmd); |
| 301 | if (ret) { |
| 302 | IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret); |
| 303 | iwl_remove_notification(&mvm->notif_wait, &wait_time_event); |
| 304 | goto out_clear_te; |
| 305 | } |
| 306 | |
| 307 | /* No need to wait for anything, so just pass 1 (0 isn't valid) */ |
| 308 | ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1); |
| 309 | /* should never fail */ |
| 310 | WARN_ON_ONCE(ret); |
| 311 | |
| 312 | if (ret) { |
| 313 | out_clear_te: |
| 314 | spin_lock_bh(&mvm->time_event_lock); |
| 315 | iwl_mvm_te_clear_data(mvm, te_data); |
| 316 | spin_unlock_bh(&mvm->time_event_lock); |
| 317 | } |
| 318 | return ret; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | void iwl_mvm_protect_session(struct iwl_mvm *mvm, |
| 322 | struct ieee80211_vif *vif, |
| 323 | u32 duration, u32 min_duration) |
| 324 | { |
| 325 | struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); |
| 326 | struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 327 | struct iwl_time_event_cmd time_cmd = {}; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 328 | |
| 329 | lockdep_assert_held(&mvm->mutex); |
| 330 | |
| 331 | if (te_data->running && |
| 332 | time_after(te_data->end_jiffies, |
| 333 | jiffies + TU_TO_JIFFIES(min_duration))) { |
| 334 | IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n", |
| 335 | jiffies_to_msecs(te_data->end_jiffies - jiffies)); |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | if (te_data->running) { |
| 340 | IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n", |
| 341 | te_data->uid, |
| 342 | jiffies_to_msecs(te_data->end_jiffies - jiffies)); |
| 343 | /* |
| 344 | * we don't have enough time |
| 345 | * cancel the current TE and issue a new one |
| 346 | * Of course it would be better to remove the old one only |
| 347 | * when the new one is added, but we don't care if we are off |
| 348 | * channel for a bit. All we need to do, is not to return |
| 349 | * before we actually begin to be on the channel. |
| 350 | */ |
| 351 | iwl_mvm_stop_session_protection(mvm, vif); |
| 352 | } |
| 353 | |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 354 | time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); |
| 355 | time_cmd.id_and_color = |
| 356 | cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); |
| 357 | time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC); |
| 358 | |
| 359 | time_cmd.apply_time = |
| 360 | cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG)); |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 361 | |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 362 | time_cmd.dep_policy = TE_INDEPENDENT; |
| 363 | time_cmd.is_present = cpu_to_le32(1); |
| 364 | time_cmd.max_frags = cpu_to_le32(TE_FRAG_NONE); |
| 365 | time_cmd.max_delay = cpu_to_le32(500); |
| 366 | /* TODO: why do we need to interval = bi if it is not periodic? */ |
| 367 | time_cmd.interval = cpu_to_le32(1); |
| 368 | time_cmd.interval_reciprocal = cpu_to_le32(iwl_mvm_reciprocal(1)); |
| 369 | time_cmd.duration = cpu_to_le32(duration); |
| 370 | time_cmd.repeat = cpu_to_le32(1); |
Ilan Peer | 1da80e8 | 2013-03-19 16:28:56 +0200 | [diff] [blame] | 371 | time_cmd.notify = cpu_to_le32(TE_NOTIF_HOST_EVENT_START | |
| 372 | TE_NOTIF_HOST_EVENT_END); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 373 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 374 | iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Explicit request to remove a time event. The removal of a time event needs to |
| 379 | * be synchronized with the flow of a time event's end notification, which also |
| 380 | * removes the time event from the op mode data structures. |
| 381 | */ |
| 382 | void iwl_mvm_remove_time_event(struct iwl_mvm *mvm, |
| 383 | struct iwl_mvm_vif *mvmvif, |
| 384 | struct iwl_mvm_time_event_data *te_data) |
| 385 | { |
| 386 | struct iwl_time_event_cmd time_cmd = {}; |
| 387 | u32 id, uid; |
| 388 | int ret; |
| 389 | |
| 390 | /* |
| 391 | * It is possible that by the time we got to this point the time |
| 392 | * event was already removed. |
| 393 | */ |
| 394 | spin_lock_bh(&mvm->time_event_lock); |
| 395 | |
| 396 | /* Save time event uid before clearing its data */ |
| 397 | uid = te_data->uid; |
| 398 | id = te_data->id; |
| 399 | |
| 400 | /* |
| 401 | * The clear_data function handles time events that were already removed |
| 402 | */ |
| 403 | iwl_mvm_te_clear_data(mvm, te_data); |
| 404 | spin_unlock_bh(&mvm->time_event_lock); |
| 405 | |
| 406 | /* |
| 407 | * It is possible that by the time we try to remove it, the time event |
| 408 | * has already ended and removed. In such a case there is no need to |
| 409 | * send a removal command. |
| 410 | */ |
| 411 | if (id == TE_MAX) { |
| 412 | IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid); |
| 413 | return; |
| 414 | } |
| 415 | |
| 416 | /* When we remove a TE, the UID is to be set in the id field */ |
| 417 | time_cmd.id = cpu_to_le32(uid); |
| 418 | time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE); |
| 419 | time_cmd.id_and_color = |
| 420 | cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); |
| 421 | |
| 422 | IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id)); |
Johannes Berg | e372282 | 2013-02-16 00:11:34 +0100 | [diff] [blame] | 423 | ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC, |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 424 | sizeof(time_cmd), &time_cmd); |
| 425 | if (WARN_ON(ret)) |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm, |
| 430 | struct ieee80211_vif *vif) |
| 431 | { |
| 432 | struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); |
| 433 | struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; |
| 434 | |
| 435 | lockdep_assert_held(&mvm->mutex); |
| 436 | iwl_mvm_remove_time_event(mvm, mvmvif, te_data); |
| 437 | } |
| 438 | |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 439 | int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif, |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 440 | int duration, enum ieee80211_roc_type type) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 441 | { |
| 442 | struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); |
| 443 | struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 444 | struct iwl_time_event_cmd time_cmd = {}; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 445 | |
| 446 | lockdep_assert_held(&mvm->mutex); |
| 447 | if (te_data->running) { |
| 448 | IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n"); |
| 449 | return -EBUSY; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * Flush the done work, just in case it's still pending, so that |
| 454 | * the work it does can complete and we can accept new frames. |
| 455 | */ |
| 456 | flush_work(&mvm->roc_done_wk); |
| 457 | |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 458 | time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); |
| 459 | time_cmd.id_and_color = |
| 460 | cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 461 | |
| 462 | switch (type) { |
| 463 | case IEEE80211_ROC_TYPE_NORMAL: |
| 464 | time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL); |
| 465 | break; |
| 466 | case IEEE80211_ROC_TYPE_MGMT_TX: |
| 467 | time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX); |
| 468 | break; |
| 469 | default: |
| 470 | WARN_ONCE(1, "Got an invalid ROC type\n"); |
| 471 | return -EINVAL; |
| 472 | } |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 473 | |
| 474 | time_cmd.apply_time = cpu_to_le32(0); |
| 475 | time_cmd.dep_policy = cpu_to_le32(TE_INDEPENDENT); |
| 476 | time_cmd.is_present = cpu_to_le32(1); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 477 | time_cmd.interval = cpu_to_le32(1); |
| 478 | |
| 479 | /* |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 480 | * The P2P Device TEs can have lower priority than other events |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 481 | * that are being scheduled by the driver/fw, and thus it might not be |
Ilan Peer | e635c79 | 2013-02-13 11:05:18 +0200 | [diff] [blame] | 482 | * scheduled. To improve the chances of it being scheduled, allow them |
| 483 | * to be fragmented, and in addition allow them to be delayed. |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 484 | */ |
| 485 | time_cmd.max_frags = cpu_to_le32(MSEC_TO_TU(duration)/20); |
| 486 | time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2)); |
| 487 | time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration)); |
| 488 | time_cmd.repeat = cpu_to_le32(1); |
Ilan Peer | 1da80e8 | 2013-03-19 16:28:56 +0200 | [diff] [blame] | 489 | time_cmd.notify = cpu_to_le32(TE_NOTIF_HOST_EVENT_START | |
| 490 | TE_NOTIF_HOST_EVENT_END); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 491 | |
Johannes Berg | ffdf968 | 2013-01-29 15:28:17 +0100 | [diff] [blame] | 492 | return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm) |
| 496 | { |
| 497 | struct iwl_mvm_vif *mvmvif; |
| 498 | struct iwl_mvm_time_event_data *te_data; |
| 499 | |
| 500 | lockdep_assert_held(&mvm->mutex); |
| 501 | |
| 502 | /* |
| 503 | * Iterate over the list of time events and find the time event that is |
| 504 | * associated with a P2P_DEVICE interface. |
| 505 | * This assumes that a P2P_DEVICE interface can have only a single time |
| 506 | * event at any given time and this time event coresponds to a ROC |
| 507 | * request |
| 508 | */ |
| 509 | mvmvif = NULL; |
| 510 | spin_lock_bh(&mvm->time_event_lock); |
| 511 | list_for_each_entry(te_data, &mvm->time_event_list, list) { |
| 512 | if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { |
| 513 | mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif); |
| 514 | break; |
| 515 | } |
| 516 | } |
| 517 | spin_unlock_bh(&mvm->time_event_lock); |
| 518 | |
| 519 | if (!mvmvif) { |
| 520 | IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n"); |
| 521 | return; |
| 522 | } |
| 523 | |
| 524 | iwl_mvm_remove_time_event(mvm, mvmvif, te_data); |
| 525 | |
| 526 | iwl_mvm_roc_finished(mvm); |
| 527 | } |