From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 9 Dec 2020 21:16:31 +0000 (+0200)
Subject: iwlwifi: mvm: do more useful queue sync accounting
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2f7a04c7b03b7fd63b7618e29295fc25732faac1;p=linux.git

iwlwifi: mvm: do more useful queue sync accounting

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>
Link: https://lore.kernel.org/r/iwlwifi.20201209231352.0a3fa177cd6b.I7c69ff999419368266279ec27dd618eb450908b3@changeid
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 2ca57ca200af8..1f0176bb83893 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -5100,8 +5100,7 @@ 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);
@@ -5113,14 +5112,16 @@ 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 de43ffff0a5df..afa04952107e1 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 e54c48af19134..2a497fb77e3a4 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 ef5bd58ef7428..d4465164457d4 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,