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linux-zen-desktop/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (C) 2012-2014, 2018-2022 Intel Corporation
* Copyright (C) 2013-2015 Intel Mobile Communications GmbH
* Copyright (C) 2017 Intel Deutschland GmbH
*/
#include <linux/jiffies.h>
#include <net/mac80211.h>
#include "fw/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"
/*
* 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 || !te_data->vif)
return;
list_del(&te_data->list);
/*
* the list is only used for AUX ROC events so make sure it is always
* initialized
*/
INIT_LIST_HEAD(&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);
/*
* 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);
synchronize_net();
/*
* Flush the offchannel queue -- this is called when the time
* event finishes or is canceled, so that frames queued for it
* won't get stuck on the queue and be transmitted in the next
* time event.
*/
mutex_lock(&mvm->mutex);
if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
struct iwl_mvm_vif *mvmvif;
/*
* NB: access to this pointer would be racy, but the flush bit
* can only be set when we had a P2P-Device VIF, and we have a
* flush of this work in iwl_mvm_prepare_mac_removal() so it's
* not really racy.
*/
if (!WARN_ON(!mvm->p2p_device_vif)) {
mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true);
}
}
/*
* Clear the ROC_AUX_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).
*/
if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
/* do the same in case of hot spot 2.0 */
iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true);
/* In newer version of this command an aux station is added only
* in cases of dedicated tx queue and need to be removed in end
* of use */
if (iwl_fw_lookup_cmd_ver(mvm->fw, ADD_STA, 0) >= 12)
iwl_mvm_rm_aux_sta(mvm);
}
mutex_unlock(&mvm->mutex);
}
static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
{
/*
* 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 void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
{
struct ieee80211_vif *csa_vif;
rcu_read_lock();
csa_vif = rcu_dereference(mvm->csa_vif);
if (!csa_vif || !csa_vif->bss_conf.csa_active)
goto out_unlock;
IWL_DEBUG_TE(mvm, "CSA NOA started\n");
/*
* CSA NoA is started but we still have beacons to
* transmit on the current channel.
* So we just do nothing here and the switch
* will be performed on the last TBTT.
*/
if (!ieee80211_beacon_cntdwn_is_complete(csa_vif)) {
IWL_WARN(mvm, "CSA NOA started too early\n");
goto out_unlock;
}
ieee80211_csa_finish(csa_vif);
rcu_read_unlock();
RCU_INIT_POINTER(mvm->csa_vif, NULL);
return;
out_unlock:
rcu_read_unlock();
}
static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
const char *errmsg)
{
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (vif->type != NL80211_IFTYPE_STATION)
return false;
if (!mvmvif->csa_bcn_pending && vif->cfg.assoc &&
vif->bss_conf.dtim_period)
return false;
if (errmsg)
IWL_ERR(mvm, "%s\n", errmsg);
if (mvmvif->csa_bcn_pending) {
struct iwl_mvm_sta *mvmsta;
rcu_read_lock();
mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, mvmvif->ap_sta_id);
if (!WARN_ON(!mvmsta))
iwl_mvm_sta_modify_disable_tx(mvm, mvmsta, false);
rcu_read_unlock();
}
if (vif->cfg.assoc) {
/*
* When not associated, this will be called from
* iwl_mvm_event_mlme_callback_ini()
*/
iwl_dbg_tlv_time_point(&mvm->fwrt,
IWL_FW_INI_TIME_POINT_ASSOC_FAILED,
NULL);
}
iwl_mvm_connection_loss(mvm, vif, errmsg);
return true;
}
static void
iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
struct iwl_mvm_time_event_data *te_data,
struct iwl_time_event_notif *notif)
{
struct ieee80211_vif *vif = te_data->vif;
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (!notif->status)
IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
switch (te_data->vif->type) {
case NL80211_IFTYPE_AP:
if (!notif->status)
mvmvif->csa_failed = true;
iwl_mvm_csa_noa_start(mvm);
break;
case NL80211_IFTYPE_STATION:
if (!notif->status) {
iwl_mvm_connection_loss(mvm, vif,
"CSA TE failed to start");
break;
}
iwl_mvm_csa_client_absent(mvm, te_data->vif);
cancel_delayed_work(&mvmvif->csa_work);
ieee80211_chswitch_done(te_data->vif, true);
break;
default:
/* should never happen */
WARN_ON_ONCE(1);
break;
}
/* we don't need it anymore */
iwl_mvm_te_clear_data(mvm, te_data);
}
static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
struct iwl_time_event_notif *notif,
struct iwl_mvm_time_event_data *te_data)
{
struct iwl_fw_dbg_trigger_tlv *trig;
struct iwl_fw_dbg_trigger_time_event *te_trig;
int i;
trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
ieee80211_vif_to_wdev(te_data->vif),
FW_DBG_TRIGGER_TIME_EVENT);
if (!trig)
return;
te_trig = (void *)trig->data;
for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
u32 trig_action_bitmap =
le32_to_cpu(te_trig->time_events[i].action_bitmap);
u32 trig_status_bitmap =
le32_to_cpu(te_trig->time_events[i].status_bitmap);
if (trig_te_id != te_data->id ||
!(trig_action_bitmap & le32_to_cpu(notif->action)) ||
!(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
continue;
iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
"Time event %d Action 0x%x received status: %d",
te_data->id,
le32_to_cpu(notif->action),
le32_to_cpu(notif->status));
break;
}
}
static void iwl_mvm_p2p_roc_finished(struct iwl_mvm *mvm)
{
/*
* If the IWL_MVM_STATUS_NEED_FLUSH_P2P is already set, then the
* roc_done_wk is already scheduled or running, so don't schedule it
* again to avoid a race where the roc_done_wk clears this bit after
* it is set here, affecting the next run of the roc_done_wk.
*/
if (!test_and_set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status))
iwl_mvm_roc_finished(mvm);
}
/*
* 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));
iwl_mvm_te_check_trigger(mvm, notif, te_data);
/*
* 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)) {
const char *msg;
if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
msg = "Time Event start notification failure";
else
msg = "Time Event end notification failure";
IWL_DEBUG_TE(mvm, "%s\n", msg);
if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
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);
switch (te_data->vif->type) {
case NL80211_IFTYPE_P2P_DEVICE:
ieee80211_remain_on_channel_expired(mvm->hw);
iwl_mvm_p2p_roc_finished(mvm);
break;
case NL80211_IFTYPE_STATION:
/*
* If we are switching channel, don't disconnect
* if the time event is already done. Beacons can
* be delayed a bit after the switch.
*/
if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
IWL_DEBUG_TE(mvm,
"No beacon heard and the CS time event is over, don't disconnect\n");
break;
}
/*
* By now, we should have finished association
* and know the dtim period.
*/
iwl_mvm_te_check_disconnect(mvm, te_data->vif,
!te_data->vif->cfg.assoc ?
"Not associated and the time event is over already..." :
"No beacon heard and the time event is over already...");
break;
default:
break;
}
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);
ieee80211_ready_on_channel(mvm->hw);
} else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
}
} else {
IWL_WARN(mvm, "Got TE with unknown action\n");
}
}
/*
* Handle A Aux ROC time event
*/
static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
struct iwl_time_event_notif *notif)
{
struct iwl_mvm_time_event_data *aux_roc_te = NULL, *te_data;
list_for_each_entry(te_data, &mvm->aux_roc_te_list, list) {
if (le32_to_cpu(notif->unique_id) == te_data->uid) {
aux_roc_te = te_data;
break;
}
}
if (!aux_roc_te) /* Not a Aux ROC time event */
return -EINVAL;
iwl_mvm_te_check_trigger(mvm, notif, te_data);
IWL_DEBUG_TE(mvm,
"Aux ROC time event notification - UID = 0x%x action %d (error = %d)\n",
le32_to_cpu(notif->unique_id),
le32_to_cpu(notif->action), le32_to_cpu(notif->status));
if (!le32_to_cpu(notif->status) ||
le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
/* End TE, notify mac80211 */
ieee80211_remain_on_channel_expired(mvm->hw);
iwl_mvm_roc_finished(mvm); /* flush aux queue */
list_del(&te_data->list); /* remove from list */
te_data->running = false;
te_data->vif = NULL;
te_data->uid = 0;
te_data->id = TE_MAX;
} else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
te_data->running = true;
ieee80211_ready_on_channel(mvm->hw); /* Start TE */
} else {
IWL_DEBUG_TE(mvm,
"ERROR: Unknown Aux ROC Time Event (action = %d)\n",
le32_to_cpu(notif->action));
return -EINVAL;
}
return 0;
}
/*
* The Rx handler for time event notifications
*/
void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
struct iwl_rx_cmd_buffer *rxb)
{
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);
/* This time event is triggered for Aux ROC request */
if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
goto unlock;
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);
}
unlock:
spin_unlock_bh(&mvm->time_event_lock);
}
static bool iwl_mvm_te_notif(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_notif *resp;
int resp_len = iwl_rx_packet_payload_len(pkt);
if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
return true;
if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
return true;
}
resp = (void *)pkt->data;
/* te_data->uid is already set in the TIME_EVENT_CMD response */
if (le32_to_cpu(resp->unique_id) != te_data->uid)
return false;
IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
te_data->uid);
if (!resp->status)
IWL_ERR(mvm,
"TIME_EVENT_NOTIFICATION received but not executed\n");
return true;
}
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 u16 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, 0,
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, bool wait_for_notif)
{
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
struct iwl_notification_wait wait_te_notif;
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(0);
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 |
TE_V2_START_IMMEDIATELY);
if (!wait_for_notif) {
iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
return;
}
/*
* Create notification_wait for the TIME_EVENT_NOTIFICATION to use
* right after we send the time event
*/
iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
te_notif_response,
ARRAY_SIZE(te_notif_response),
iwl_mvm_te_notif, te_data);
/* If TE was sent OK - wait for the notification that started */
if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
IWL_ERR(mvm, "Failed to add TE to protect session\n");
iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
} else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
TU_TO_JIFFIES(max_delay))) {
IWL_ERR(mvm, "Failed to protect session until TE\n");
}
}
static void iwl_mvm_cancel_session_protection(struct iwl_mvm *mvm,
struct iwl_mvm_vif *mvmvif,
u32 id)
{
struct iwl_mvm_session_prot_cmd cmd = {
.id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
mvmvif->color)),
.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE),
.conf_id = cpu_to_le32(id),
};
int ret;
ret = iwl_mvm_send_cmd_pdu(mvm,
WIDE_ID(MAC_CONF_GROUP, SESSION_PROTECTION_CMD),
0, sizeof(cmd), &cmd);
if (ret)
IWL_ERR(mvm,
"Couldn't send the SESSION_PROTECTION_CMD: %d\n", ret);
}
static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
struct iwl_mvm_time_event_data *te_data,
u32 *uid)
{
u32 id;
struct iwl_mvm_vif *mvmvif;
enum nl80211_iftype iftype;
if (!te_data->vif)
return false;
mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
iftype = te_data->vif->type;
/*
* 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);
/* When session protection is used, the te_data->id field
* is reused to save session protection's configuration.
* For AUX ROC, HOT_SPOT_CMD is used and the te_data->id field is set
* to HOT_SPOT_CMD.
*/
if (fw_has_capa(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD) &&
id != HOT_SPOT_CMD) {
if (mvmvif && id < SESSION_PROTECT_CONF_MAX_ID) {
/* Session protection is still ongoing. Cancel it */
iwl_mvm_cancel_session_protection(mvm, mvmvif, id);
if (iftype == NL80211_IFTYPE_P2P_DEVICE) {
iwl_mvm_p2p_roc_finished(mvm);
}
}
return false;
} else {
/* 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 false;
}
}
return true;
}
/*
* Explicit request to remove a aux roc 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.
*/
static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
struct iwl_mvm_vif *mvmvif,
struct iwl_mvm_time_event_data *te_data)
{
struct iwl_hs20_roc_req aux_cmd = {};
u16 len = sizeof(aux_cmd) - iwl_mvm_chan_info_padding(mvm);
u32 uid;
int ret;
if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
return;
aux_cmd.event_unique_id = cpu_to_le32(uid);
aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
aux_cmd.id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
le32_to_cpu(aux_cmd.event_unique_id));
ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
len, &aux_cmd);
if (WARN_ON(ret))
return;
}
/*
* 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 uid;
int ret;
if (!__iwl_mvm_remove_time_event(mvm, te_data, &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, 0,
sizeof(time_cmd), &time_cmd);
if (ret)
IWL_ERR(mvm, "Couldn't remove the time event\n");
}
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;
u32 id;
lockdep_assert_held(&mvm->mutex);
spin_lock_bh(&mvm->time_event_lock);
id = te_data->id;
spin_unlock_bh(&mvm->time_event_lock);
if (fw_has_capa(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
if (id != SESSION_PROTECT_CONF_ASSOC) {
IWL_DEBUG_TE(mvm,
"don't remove session protection id=%u\n",
id);
return;
}
} else if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
IWL_DEBUG_TE(mvm,
"don't remove TE with id=%u (not session protection)\n",
id);
return;
}
iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
}
void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_mvm_session_prot_notif *notif = (void *)pkt->data;
struct ieee80211_vif *vif;
struct iwl_mvm_vif *mvmvif;
rcu_read_lock();
vif = iwl_mvm_rcu_dereference_vif_id(mvm, le32_to_cpu(notif->mac_id),
true);
if (!vif)
goto out_unlock;
mvmvif = iwl_mvm_vif_from_mac80211(vif);
/* The vif is not a P2P_DEVICE, maintain its time_event_data */
if (vif->type != NL80211_IFTYPE_P2P_DEVICE) {
struct iwl_mvm_time_event_data *te_data =
&mvmvif->time_event_data;
if (!le32_to_cpu(notif->status)) {
iwl_mvm_te_check_disconnect(mvm, vif,
"Session protection failure");
spin_lock_bh(&mvm->time_event_lock);
iwl_mvm_te_clear_data(mvm, te_data);
spin_unlock_bh(&mvm->time_event_lock);
}
if (le32_to_cpu(notif->start)) {
spin_lock_bh(&mvm->time_event_lock);
te_data->running = le32_to_cpu(notif->start);
te_data->end_jiffies =
TU_TO_EXP_TIME(te_data->duration);
spin_unlock_bh(&mvm->time_event_lock);
} else {
/*
* By now, we should have finished association
* and know the dtim period.
*/
iwl_mvm_te_check_disconnect(mvm, vif,
!vif->cfg.assoc ?
"Not associated and the session protection is over already..." :
"No beacon heard and the session protection is over already...");
spin_lock_bh(&mvm->time_event_lock);
iwl_mvm_te_clear_data(mvm, te_data);
spin_unlock_bh(&mvm->time_event_lock);
}
goto out_unlock;
}
if (!le32_to_cpu(notif->status) || !le32_to_cpu(notif->start)) {
/* End TE, notify mac80211 */
mvmvif->time_event_data.id = SESSION_PROTECT_CONF_MAX_ID;
ieee80211_remain_on_channel_expired(mvm->hw);
iwl_mvm_p2p_roc_finished(mvm);
} else if (le32_to_cpu(notif->start)) {
if (WARN_ON(mvmvif->time_event_data.id !=
le32_to_cpu(notif->conf_id)))
goto out_unlock;
set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
ieee80211_ready_on_channel(mvm->hw); /* Start TE */
}
out_unlock:
rcu_read_unlock();
}
static int
iwl_mvm_start_p2p_roc_session_protection(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_session_prot_cmd cmd = {
.id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
mvmvif->color)),
.action = cpu_to_le32(FW_CTXT_ACTION_ADD),
.duration_tu = cpu_to_le32(MSEC_TO_TU(duration)),
};
lockdep_assert_held(&mvm->mutex);
/* The time_event_data.id field is reused to save session
* protection's configuration.
*/
switch (type) {
case IEEE80211_ROC_TYPE_NORMAL:
mvmvif->time_event_data.id =
SESSION_PROTECT_CONF_P2P_DEVICE_DISCOV;
break;
case IEEE80211_ROC_TYPE_MGMT_TX:
mvmvif->time_event_data.id =
SESSION_PROTECT_CONF_P2P_GO_NEGOTIATION;
break;
default:
WARN_ONCE(1, "Got an invalid ROC type\n");
return -EINVAL;
}
cmd.conf_id = cpu_to_le32(mvmvif->time_event_data.id);
return iwl_mvm_send_cmd_pdu(mvm,
WIDE_ID(MAC_CONF_GROUP, SESSION_PROTECTION_CMD),
0, sizeof(cmd), &cmd);
}
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;
}
if (fw_has_capa(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD))
return iwl_mvm_start_p2p_roc_session_protection(mvm, vif,
duration,
type);
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 |
TE_V2_START_IMMEDIATELY);
return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
}
static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
{
struct iwl_mvm_time_event_data *te_data;
lockdep_assert_held(&mvm->mutex);
spin_lock_bh(&mvm->time_event_lock);
/*
* 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
*/
list_for_each_entry(te_data, &mvm->time_event_list, list) {
if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
goto out;
}
/* There can only be at most one AUX ROC time event, we just use the
* list to simplify/unify code. Remove it if it exists.
*/
te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
struct iwl_mvm_time_event_data,
list);
out:
spin_unlock_bh(&mvm->time_event_lock);
return te_data;
}
void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
{
struct iwl_mvm_time_event_data *te_data;
u32 uid;
te_data = iwl_mvm_get_roc_te(mvm);
if (te_data)
__iwl_mvm_remove_time_event(mvm, te_data, &uid);
}
void iwl_mvm_stop_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
struct iwl_mvm_vif *mvmvif;
struct iwl_mvm_time_event_data *te_data;
if (fw_has_capa(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
iwl_mvm_cancel_session_protection(mvm, mvmvif,
mvmvif->time_event_data.id);
iwl_mvm_p2p_roc_finished(mvm);
} else {
iwl_mvm_remove_aux_roc_te(mvm, mvmvif,
&mvmvif->hs_time_event_data);
iwl_mvm_roc_finished(mvm);
}
return;
}
te_data = iwl_mvm_get_roc_te(mvm);
if (!te_data) {
IWL_WARN(mvm, "No remain on channel event\n");
return;
}
mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
iwl_mvm_p2p_roc_finished(mvm);
} else {
iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
iwl_mvm_roc_finished(mvm);
}
}
void iwl_mvm_remove_csa_period(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;
u32 id;
lockdep_assert_held(&mvm->mutex);
spin_lock_bh(&mvm->time_event_lock);
id = te_data->id;
spin_unlock_bh(&mvm->time_event_lock);
if (id != TE_CHANNEL_SWITCH_PERIOD)
return;
iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
}
int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
u32 duration, u32 apply_time)
{
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) {
u32 id;
spin_lock_bh(&mvm->time_event_lock);
id = te_data->id;
spin_unlock_bh(&mvm->time_event_lock);
if (id == TE_CHANNEL_SWITCH_PERIOD) {
IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
return -EBUSY;
}
/*
* Remove the session protection time event to allow the
* channel switch. If we got here, we just heard a beacon so
* the session protection is not needed anymore anyway.
*/
iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
}
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_CHANNEL_SWITCH_PERIOD);
time_cmd.apply_time = cpu_to_le32(apply_time);
time_cmd.max_frags = TE_V2_FRAG_NONE;
time_cmd.duration = cpu_to_le32(duration);
time_cmd.repeat = 1;
time_cmd.interval = cpu_to_le32(1);
time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
TE_V2_ABSENCE);
if (!apply_time)
time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
}
static bool iwl_mvm_session_prot_notif(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_session_prot_notif *resp;
int resp_len = iwl_rx_packet_payload_len(pkt);
if (WARN_ON(pkt->hdr.cmd != SESSION_PROTECTION_NOTIF ||
pkt->hdr.group_id != MAC_CONF_GROUP))
return true;
if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
IWL_ERR(mvm, "Invalid SESSION_PROTECTION_NOTIF response\n");
return true;
}
resp = (void *)pkt->data;
if (!resp->status)
IWL_ERR(mvm,
"TIME_EVENT_NOTIFICATION received but not executed\n");
return true;
}
void iwl_mvm_schedule_session_protection(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
u32 duration, u32 min_duration,
bool wait_for_notif)
{
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
const u16 notif[] = { WIDE_ID(MAC_CONF_GROUP, SESSION_PROTECTION_NOTIF) };
struct iwl_notification_wait wait_notif;
struct iwl_mvm_session_prot_cmd cmd = {
.id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
mvmvif->color)),
.action = cpu_to_le32(FW_CTXT_ACTION_ADD),
.conf_id = cpu_to_le32(SESSION_PROTECT_CONF_ASSOC),
.duration_tu = cpu_to_le32(MSEC_TO_TU(duration)),
};
lockdep_assert_held(&mvm->mutex);
spin_lock_bh(&mvm->time_event_lock);
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));
spin_unlock_bh(&mvm->time_event_lock);
return;
}
iwl_mvm_te_clear_data(mvm, te_data);
/*
* The time_event_data.id field is reused to save session
* protection's configuration.
*/
te_data->id = le32_to_cpu(cmd.conf_id);
te_data->duration = le32_to_cpu(cmd.duration_tu);
te_data->vif = vif;
spin_unlock_bh(&mvm->time_event_lock);
IWL_DEBUG_TE(mvm, "Add new session protection, duration %d TU\n",
le32_to_cpu(cmd.duration_tu));
if (!wait_for_notif) {
if (iwl_mvm_send_cmd_pdu(mvm,
WIDE_ID(MAC_CONF_GROUP, SESSION_PROTECTION_CMD),
0, sizeof(cmd), &cmd)) {
IWL_ERR(mvm,
"Couldn't send the SESSION_PROTECTION_CMD\n");
spin_lock_bh(&mvm->time_event_lock);
iwl_mvm_te_clear_data(mvm, te_data);
spin_unlock_bh(&mvm->time_event_lock);
}
return;
}
iwl_init_notification_wait(&mvm->notif_wait, &wait_notif,
notif, ARRAY_SIZE(notif),
iwl_mvm_session_prot_notif, NULL);
if (iwl_mvm_send_cmd_pdu(mvm,
WIDE_ID(MAC_CONF_GROUP, SESSION_PROTECTION_CMD),
0, sizeof(cmd), &cmd)) {
IWL_ERR(mvm,
"Couldn't send the SESSION_PROTECTION_CMD\n");
iwl_remove_notification(&mvm->notif_wait, &wait_notif);
} else if (iwl_wait_notification(&mvm->notif_wait, &wait_notif,
TU_TO_JIFFIES(100))) {
IWL_ERR(mvm,
"Failed to protect session until session protection\n");
}
}