diff mbox series

[03/12] iwlwifi: mvm: do more useful queue sync accounting

Message ID iwlwifi.20201206130357.49566b6a57d9.I7c69ff999419368266279ec27dd618eb450908b3@changeid
State Superseded
Headers show
Series iwlwifi: updates intended for v5.11 2020-12-06 part 2 | expand

Commit Message

Luca Coelho Dec. 6, 2020, 11:07 a.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

We're currently doing accounting on the queue sync with an
atomic variable that counts down the number of remaining
notifications that we still need.

As we've been hitting issues in this area, modify this to
track a bitmap of queues, not just the number of queues,
and print out the remaining bitmap in the warning.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 11 ++++++-----
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h      |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c      |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c     | 10 +++++++---
 4 files changed, 15 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 766aeeaf1fcf..be3d4515b772 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -5097,8 +5097,7 @@  void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 
 	if (notif->sync) {
 		notif->cookie = mvm->queue_sync_cookie;
-		atomic_set(&mvm->queue_sync_counter,
-			   mvm->trans->num_rx_queues);
+		mvm->queue_sync_state = (1 << mvm->trans->num_rx_queues) - 1;
 	}
 
 	ret = iwl_mvm_notify_rx_queue(mvm, qmask, notif, size, !notif->sync);
@@ -5110,14 +5109,16 @@  void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 	if (notif->sync) {
 		lockdep_assert_held(&mvm->mutex);
 		ret = wait_event_timeout(mvm->rx_sync_waitq,
-					 atomic_read(&mvm->queue_sync_counter) == 0 ||
+					 READ_ONCE(mvm->queue_sync_state) == 0 ||
 					 iwl_mvm_is_radio_killed(mvm),
 					 HZ);
-		WARN_ON_ONCE(!ret && !iwl_mvm_is_radio_killed(mvm));
+		WARN_ONCE(!ret && !iwl_mvm_is_radio_killed(mvm),
+			  "queue sync: failed to sync, state is 0x%lx\n",
+			  mvm->queue_sync_state);
 	}
 
 out:
-	atomic_set(&mvm->queue_sync_counter, 0);
+	mvm->queue_sync_state = 0;
 	if (notif->sync)
 		mvm->queue_sync_cookie++;
 }
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index de43ffff0a5d..afa04952107e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -842,7 +842,7 @@  struct iwl_mvm {
 	unsigned long status;
 
 	u32 queue_sync_cookie;
-	atomic_t queue_sync_counter;
+	unsigned long queue_sync_state;
 	/*
 	 * for beacon filtering -
 	 * currently only one interface can be supported
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index e54c48af1913..2a497fb77e3a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -703,7 +703,7 @@  iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 
 	init_waitqueue_head(&mvm->rx_sync_waitq);
 
-	atomic_set(&mvm->queue_sync_counter, 0);
+	mvm->queue_sync_state = 0;
 
 	SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index ef5bd58ef742..d4465164457d 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -827,9 +827,13 @@  void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi,
 		WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 	}
 
-	if (internal_notif->sync &&
-	    !atomic_dec_return(&mvm->queue_sync_counter))
-		wake_up(&mvm->rx_sync_waitq);
+	if (internal_notif->sync) {
+		WARN_ONCE(!test_and_clear_bit(queue, &mvm->queue_sync_state),
+			  "queue sync: queue %d responded a second time!\n",
+			  queue);
+		if (READ_ONCE(mvm->queue_sync_state) == 0)
+			wake_up(&mvm->rx_sync_waitq);
+	}
 }
 
 static void iwl_mvm_oldsn_workaround(struct iwl_mvm *mvm,