/****************************************************************************** * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, * USA * * The full GNU General Public License is included in this distribution * in the file called COPYING. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * * BSD LICENSE * * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * *****************************************************************************/ #include #include #include "iwl-notif-wait.h" #include "iwl-trans.h" #include "fw-api.h" #include "time-event.h" #include "mvm.h" #include "iwl-io.h" #include "iwl-prph.h" /* A TimeUnit is 1024 microsecond */ #define MSEC_TO_TU(_msec) (_msec*1000/1024) /* * For the high priority TE use a time event type that has similar priority to * the FW's action scan priority. */ #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC void iwl_mvm_te_clear_data(struct iwl_mvm *mvm, struct iwl_mvm_time_event_data *te_data) { lockdep_assert_held(&mvm->time_event_lock); if (te_data->id == TE_MAX) return; list_del(&te_data->list); te_data->running = false; te_data->uid = 0; te_data->id = TE_MAX; te_data->vif = NULL; } void iwl_mvm_roc_done_wk(struct work_struct *wk) { struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk); synchronize_net(); /* * Flush the offchannel queue -- this is called when the time * event finishes or is cancelled, so that frames queued for it * won't get stuck on the queue and be transmitted in the next * time event. * We have to send the command asynchronously since this cannot * be under the mutex for locking reasons, but that's not an * issue as it will have to complete before the next command is * executed, and a new time event means a new command. */ iwl_mvm_flush_tx_path(mvm, BIT(IWL_MVM_OFFCHANNEL_QUEUE), false); } static void iwl_mvm_roc_finished(struct iwl_mvm *mvm) { /* * First, clear the ROC_RUNNING status bit. This will cause the TX * path to drop offchannel transmissions. That would also be done * by mac80211, but it is racy, in particular in the case that the * time event actually completed in the firmware (which is handled * in iwl_mvm_te_handle_notif). */ clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); iwl_mvm_unref(mvm, IWL_MVM_REF_ROC); /* * Of course, our status bit is just as racy as mac80211, so in * addition, fire off the work struct which will drop all frames * from the hardware queues that made it through the race. First * it will of course synchronize the TX path to make sure that * any *new* TX will be rejected. */ schedule_work(&mvm->roc_done_wk); } static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm, struct ieee80211_vif *vif, const char *errmsg) { if (vif->type != NL80211_IFTYPE_STATION) return false; if (vif->bss_conf.assoc && vif->bss_conf.dtim_period) return false; if (errmsg) IWL_ERR(mvm, "%s\n", errmsg); ieee80211_connection_loss(vif); return true; } /* * Handles a FW notification for an event that is known to the driver. * * @mvm: the mvm component * @te_data: the time event data * @notif: the notification data corresponding the time event data. */ static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm, struct iwl_mvm_time_event_data *te_data, struct iwl_time_event_notif *notif) { lockdep_assert_held(&mvm->time_event_lock); IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n", le32_to_cpu(notif->unique_id), le32_to_cpu(notif->action)); /* * The FW sends the start/end time event notifications even for events * that it fails to schedule. This is indicated in the status field of * the notification. This happens in cases that the scheduler cannot * find a schedule that can handle the event (for example requesting a * P2P Device discoveribility, while there are other higher priority * events in the system). */ if (!le32_to_cpu(notif->status)) { bool start = le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START; IWL_WARN(mvm, "Time Event %s notification failure\n", start ? "start" : "end"); if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, NULL)) { iwl_mvm_te_clear_data(mvm, te_data); return; } } if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) { IWL_DEBUG_TE(mvm, "TE ended - current time %lu, estimated end %lu\n", jiffies, te_data->end_jiffies); if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { ieee80211_remain_on_channel_expired(mvm->hw); iwl_mvm_roc_finished(mvm); } /* * By now, we should have finished association * and know the dtim period. */ iwl_mvm_te_check_disconnect(mvm, te_data->vif, "No association and the time event is over already..."); iwl_mvm_te_clear_data(mvm, te_data); } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) { te_data->running = true; te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration); if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); iwl_mvm_ref(mvm, IWL_MVM_REF_ROC); ieee80211_ready_on_channel(mvm->hw); } } else { IWL_WARN(mvm, "Got TE with unknown action\n"); } } /* * The Rx handler for time event notifications */ int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, struct iwl_device_cmd *cmd) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_time_event_notif *notif = (void *)pkt->data; struct iwl_mvm_time_event_data *te_data, *tmp; IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n", le32_to_cpu(notif->unique_id), le32_to_cpu(notif->action)); spin_lock_bh(&mvm->time_event_lock); list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) { if (le32_to_cpu(notif->unique_id) == te_data->uid) iwl_mvm_te_handle_notif(mvm, te_data, notif); } spin_unlock_bh(&mvm->time_event_lock); return 0; } static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait, struct iwl_rx_packet *pkt, void *data) { struct iwl_mvm *mvm = container_of(notif_wait, struct iwl_mvm, notif_wait); struct iwl_mvm_time_event_data *te_data = data; struct iwl_time_event_resp *resp; int resp_len = iwl_rx_packet_payload_len(pkt); if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD)) return true; if (WARN_ON_ONCE(resp_len != sizeof(*resp))) { IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n"); return true; } resp = (void *)pkt->data; /* we should never get a response to another TIME_EVENT_CMD here */ if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id)) return false; te_data->uid = le32_to_cpu(resp->unique_id); IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n", te_data->uid); return true; } static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif, struct iwl_mvm_time_event_data *te_data, struct iwl_time_event_cmd *te_cmd) { static const u8 time_event_response[] = { TIME_EVENT_CMD }; struct iwl_notification_wait wait_time_event; int ret; lockdep_assert_held(&mvm->mutex); IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n", le32_to_cpu(te_cmd->duration)); spin_lock_bh(&mvm->time_event_lock); if (WARN_ON(te_data->id != TE_MAX)) { spin_unlock_bh(&mvm->time_event_lock); return -EIO; } te_data->vif = vif; te_data->duration = le32_to_cpu(te_cmd->duration); te_data->id = le32_to_cpu(te_cmd->id); list_add_tail(&te_data->list, &mvm->time_event_list); spin_unlock_bh(&mvm->time_event_lock); /* * Use a notification wait, which really just processes the * command response and doesn't wait for anything, in order * to be able to process the response and get the UID inside * the RX path. Using CMD_WANT_SKB doesn't work because it * stores the buffer and then wakes up this thread, by which * time another notification (that the time event started) * might already be processed unsuccessfully. */ iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event, time_event_response, ARRAY_SIZE(time_event_response), iwl_mvm_time_event_response, te_data); ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC, sizeof(*te_cmd), te_cmd); if (ret) { IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret); iwl_remove_notification(&mvm->notif_wait, &wait_time_event); goto out_clear_te; } /* No need to wait for anything, so just pass 1 (0 isn't valid) */ ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1); /* should never fail */ WARN_ON_ONCE(ret); if (ret) { out_clear_te: spin_lock_bh(&mvm->time_event_lock); iwl_mvm_te_clear_data(mvm, te_data); spin_unlock_bh(&mvm->time_event_lock); } return ret; } void iwl_mvm_protect_session(struct iwl_mvm *mvm, struct ieee80211_vif *vif, u32 duration, u32 min_duration, u32 max_delay) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; struct iwl_time_event_cmd time_cmd = {}; lockdep_assert_held(&mvm->mutex); if (te_data->running && time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) { IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n", jiffies_to_msecs(te_data->end_jiffies - jiffies)); return; } if (te_data->running) { IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n", te_data->uid, jiffies_to_msecs(te_data->end_jiffies - jiffies)); /* * we don't have enough time * cancel the current TE and issue a new one * Of course it would be better to remove the old one only * when the new one is added, but we don't care if we are off * channel for a bit. All we need to do, is not to return * before we actually begin to be on the channel. */ iwl_mvm_stop_session_protection(mvm, vif); } time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); time_cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC); time_cmd.apply_time = cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG)); time_cmd.max_frags = TE_V2_FRAG_NONE; time_cmd.max_delay = cpu_to_le32(max_delay); /* TODO: why do we need to interval = bi if it is not periodic? */ time_cmd.interval = cpu_to_le32(1); time_cmd.duration = cpu_to_le32(duration); time_cmd.repeat = 1; time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START | TE_V2_NOTIF_HOST_EVENT_END | T2_V2_START_IMMEDIATELY); iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); } /* * Explicit request to remove a time event. The removal of a time event needs to * be synchronized with the flow of a time event's end notification, which also * removes the time event from the op mode data structures. */ void iwl_mvm_remove_time_event(struct iwl_mvm *mvm, struct iwl_mvm_vif *mvmvif, struct iwl_mvm_time_event_data *te_data) { struct iwl_time_event_cmd time_cmd = {}; u32 id, uid; int ret; /* * It is possible that by the time we got to this point the time * event was already removed. */ spin_lock_bh(&mvm->time_event_lock); /* Save time event uid before clearing its data */ uid = te_data->uid; id = te_data->id; /* * The clear_data function handles time events that were already removed */ iwl_mvm_te_clear_data(mvm, te_data); spin_unlock_bh(&mvm->time_event_lock); /* * It is possible that by the time we try to remove it, the time event * has already ended and removed. In such a case there is no need to * send a removal command. */ if (id == TE_MAX) { IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid); return; } /* When we remove a TE, the UID is to be set in the id field */ time_cmd.id = cpu_to_le32(uid); time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE); time_cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id)); ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC, sizeof(time_cmd), &time_cmd); if (WARN_ON(ret)) return; } void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm, struct ieee80211_vif *vif) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; lockdep_assert_held(&mvm->mutex); iwl_mvm_remove_time_event(mvm, mvmvif, te_data); } int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif, int duration, enum ieee80211_roc_type type) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; struct iwl_time_event_cmd time_cmd = {}; lockdep_assert_held(&mvm->mutex); if (te_data->running) { IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n"); return -EBUSY; } /* * Flush the done work, just in case it's still pending, so that * the work it does can complete and we can accept new frames. */ flush_work(&mvm->roc_done_wk); time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); time_cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); switch (type) { case IEEE80211_ROC_TYPE_NORMAL: time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL); break; case IEEE80211_ROC_TYPE_MGMT_TX: time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX); break; default: WARN_ONCE(1, "Got an invalid ROC type\n"); return -EINVAL; } time_cmd.apply_time = cpu_to_le32(0); time_cmd.interval = cpu_to_le32(1); /* * The P2P Device TEs can have lower priority than other events * that are being scheduled by the driver/fw, and thus it might not be * scheduled. To improve the chances of it being scheduled, allow them * to be fragmented, and in addition allow them to be delayed. */ time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS); time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2)); time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration)); time_cmd.repeat = 1; time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START | TE_V2_NOTIF_HOST_EVENT_END | T2_V2_START_IMMEDIATELY); return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); } void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm) { struct iwl_mvm_vif *mvmvif; struct iwl_mvm_time_event_data *te_data; lockdep_assert_held(&mvm->mutex); /* * Iterate over the list of time events and find the time event that is * associated with a P2P_DEVICE interface. * This assumes that a P2P_DEVICE interface can have only a single time * event at any given time and this time event coresponds to a ROC * request */ mvmvif = NULL; spin_lock_bh(&mvm->time_event_lock); list_for_each_entry(te_data, &mvm->time_event_list, list) { if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif); break; } } spin_unlock_bh(&mvm->time_event_lock); if (!mvmvif) { IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n"); return; } iwl_mvm_remove_time_event(mvm, mvmvif, te_data); iwl_mvm_roc_finished(mvm); }