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iwlwifi: mvm: implement driver RX queues sync command

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mac80211 will call the driver whenever there is a race between
RSS queues and control path that requires a processing of all
pending frames in RSS queues.
Implement that by utilizing the internal notification mechanism:
queue a message to all queues. When the message is received on
a queue it decrements the atomic counter. This guarantees that
all pending frames in the RX queue were processed since the message
is in order inside the queue.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Sara Sharon 2016-02-18 14:21:12 +02:00 committed by Luca Coelho
parent e5ed17929b
commit 0636b93821
5 changed files with 58 additions and 0 deletions
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4
drivers/net/wireless/intel/iwlwifi/mvm/fw-api-rx.h
View File

@ -437,9 +437,11 @@ struct iwl_rxq_sync_notification {
/**
* Internal message identifier
*
* @IWL_MVM_RXQ_SYNC: sync RSS queues
* @IWL_MVM_RXQ_NOTIF_DEL_BA: notify RSS queues of delBA
*/
enum iwl_mvm_rxq_notif_type {
IWL_MVM_RXQ_SYNC,
IWL_MVM_RXQ_NOTIF_DEL_BA,
};
@ -448,10 +450,12 @@ enum iwl_mvm_rxq_notif_type {
* in &iwl_rxq_sync_cmd. Should be DWORD aligned.
*
* @type: value from &iwl_mvm_rxq_notif_type
* @cookie: internal cookie to identify old notifications
* @data: payload
*/
struct iwl_mvm_internal_rxq_notif {
u32 type;
u32 cookie;
u8 data[];
} __packed;

43
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -4037,6 +4037,47 @@ static void iwl_mvm_mac_event_callback(struct ieee80211_hw *hw,
}
}
static void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm)
{
struct iwl_mvm_internal_rxq_notif data = {
.type = IWL_MVM_RXQ_SYNC,
.cookie = mvm->queue_sync_cookie,
};
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(notif_waitq);
u32 qmask = BIT(mvm->trans->num_rx_queues) - 1;
int ret;
lockdep_assert_held(&mvm->mutex);
if (!iwl_mvm_has_new_rx_api(mvm))
return;
atomic_set(&mvm->queue_sync_counter, mvm->trans->num_rx_queues);
ret = iwl_mvm_notify_rx_queue(mvm, qmask, (u8 *)&data, sizeof(data));
if (ret) {
IWL_ERR(mvm, "Failed to trigger RX queues sync (%d)\n", ret);
goto out;
}
ret = wait_event_timeout(notif_waitq,
atomic_read(&mvm->queue_sync_counter) == 0,
HZ);
WARN_ON_ONCE(!ret);
out:
atomic_set(&mvm->queue_sync_counter, 0);
mvm->queue_sync_cookie++;
}
static void iwl_mvm_sync_rx_queues(struct ieee80211_hw *hw)
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
mutex_lock(&mvm->mutex);
iwl_mvm_sync_rx_queues_internal(mvm);
mutex_unlock(&mvm->mutex);
}
const struct ieee80211_ops iwl_mvm_hw_ops = {
.tx = iwl_mvm_mac_tx,
.ampdu_action = iwl_mvm_mac_ampdu_action,
@ -4093,6 +4134,8 @@ const struct ieee80211_ops iwl_mvm_hw_ops = {
.event_callback = iwl_mvm_mac_event_callback,
.sync_rx_queues = iwl_mvm_sync_rx_queues,
CFG80211_TESTMODE_CMD(iwl_mvm_mac_testmode_cmd)
#ifdef CONFIG_PM_SLEEP

2
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
View File

@ -633,6 +633,8 @@ struct iwl_mvm {
unsigned long status;
u32 queue_sync_cookie;
atomic_t queue_sync_counter;
/*
* for beacon filtering -
* currently only one interface can be supported

2
drivers/net/wireless/intel/iwlwifi/mvm/ops.c
View File

@ -586,6 +586,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
skb_queue_head_init(&mvm->d0i3_tx);
init_waitqueue_head(&mvm->d0i3_exit_waitq);
atomic_set(&mvm->queue_sync_counter, 0);
SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);
/*

7
drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
View File

@ -406,6 +406,13 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
internal_notif = (void *)notif->payload;
switch (internal_notif->type) {
case IWL_MVM_RXQ_SYNC:
if (mvm->queue_sync_cookie == internal_notif->cookie)
atomic_dec(&mvm->queue_sync_counter);
else
WARN_ONCE(1,
"Received expired RX queue sync message\n");
break;
case IWL_MVM_RXQ_NOTIF_DEL_BA:
/* TODO */
break;