iwlwifi: mvm: implement driver RX queues sync command
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>
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 5ace468..d6ad77a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -4037,6 +4037,47 @@
}
}
+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 @@
.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