[PATCH 00/16] iwlwifi: fixes intended for 5.3 2019-07-20

[PATCH 00/16] iwlwifi: fixes intended for 5.3 2019-07-20

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

This is the second patchset with fixes for v5.3.

The changes are:

* Fix for an NSSN syncronization issue;
* Some fixes in rate-scaling;
* Fix for an "unknown command" bug with some FW versions;
* A couple of debug infrastructure fixes;
* One locking fix with GTK;
* Small fix for an error path (the error was ignored due to a type
  issue);

As usual, I'm pushing this to a pending branch, for kbuild bot.  I can
send you a pull-request for this or I can assign them to you so you
can apply them directly to wireless-drivers.  Let me know what you
prefer.


Cheers,
Luca.


Colin Ian King (1):
  iwlwifi: mvm: fix comparison of u32 variable with less than zero

Emmanuel Grumbach (5):
  iwlwifi: mvm: prepare the ground for more RSS notifications
  iwlwifi: mvm: add a new RSS sync notification for NSSN sync
  iwlwiif: mvm: refactor iwl_mvm_notify_rx_queue
  iwlwifi: mvm: add a loose synchronization of the NSSN across Rx queues
  iwlwifi: mvm: fix frame drop from the reordering buffer

Gregory Greenman (4):
  iwlwifi: mvm: add a wrapper around rs_tx_status to handle locks
  iwlwifi: mvm: send LQ command always ASYNC
  iwlwifi: mvm: replace RS mutex with a spin_lock
  iwlwifi: mvm: fix possible out-of-bounds read when accessing lq_info

Ihab Zhaika (1):
  iwlwifi: add 3 new IDs for the 9000 series (iwl9260_2ac_160_cfg)

Johannes Berg (1):
  iwlwifi: fix locking in delayed GTK setting

Luca Coelho (2):
  iwlwifi: mvm: don't send GEO_TX_POWER_LIMIT on version < 41
  iwlwifi: mvm: fix version check for GEO_TX_POWER_LIMIT support

Shahar S Matityahu (2):
  iwlwifi: dbg_ini: move iwl_dbg_tlv_load_bin out of debug override
    ifdef
  iwlwifi: dbg_ini: move iwl_dbg_tlv_free outside of debugfs ifdef

 .../net/wireless/intel/iwlwifi/fw/api/rx.h    |   3 +-
 drivers/net/wireless/intel/iwlwifi/iwl-drv.c  |   4 +-
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c   |  27 +-
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c |  44 +-
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |   8 +-
 drivers/net/wireless/intel/iwlwifi/mvm/nvm.c  |   2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c  |   4 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c   | 559 +++++++++---------
 drivers/net/wireless/intel/iwlwifi/mvm/rs.h   |   6 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 185 ++++--
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c  |  10 +-
 drivers/net/wireless/intel/iwlwifi/mvm/sta.h  |  13 +-
 .../net/wireless/intel/iwlwifi/mvm/utils.c    |   4 +-
 drivers/net/wireless/intel/iwlwifi/pcie/drv.c |   3 +
 14 files changed, 496 insertions(+), 376 deletions(-)

-- 
2.20.1

[PATCH 01/16] iwlwifi: mvm: don't send GEO_TX_POWER_LIMIT on version < 41

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

Firmware versions before 41 don't support the GEO_TX_POWER_LIMIT
command, and sending it to the firmware will cause a firmware crash.
We allow this via debugfs, so we need to return an error value in case
it's not supported.

This had already been fixed during init, when we send the command if
the ACPI WGDS table is present.  Fix it also for the other,
userspace-triggered case.

Cc: stable@vger.kernel.org
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 22 ++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 1d608e9e9101..a837cf40afde 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -880,6 +880,17 @@ int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b)
 	return iwl_mvm_send_cmd_pdu(mvm, REDUCE_TX_POWER_CMD, 0, len, &cmd);
 }
 
+static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
+{
+	/*
+	 * The GEO_TX_POWER_LIMIT command is not supported on earlier
+	 * firmware versions.  Unfortunately, we don't have a TLV API
+	 * flag to rely on, so rely on the major version which is in
+	 * the first byte of ucode_ver.
+	 */
+	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 41;
+}
+
 int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
 {
 	struct iwl_geo_tx_power_profiles_resp *resp;
@@ -909,6 +920,9 @@ int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
 		.data = { data },
 	};
 
+	if (!iwl_mvm_sar_geo_support(mvm))
+		return -EOPNOTSUPP;
+
 	ret = iwl_mvm_send_cmd(mvm, &cmd);
 	if (ret) {
 		IWL_ERR(mvm, "Failed to get geographic profile info %d\n", ret);
@@ -934,13 +948,7 @@ static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
 	int ret, i, j;
 	u16 cmd_wide_id =  WIDE_ID(PHY_OPS_GROUP, GEO_TX_POWER_LIMIT);
 
-	/*
-	 * This command is not supported on earlier firmware versions.
-	 * Unfortunately, we don't have a TLV API flag to rely on, so
-	 * rely on the major version which is in the first byte of
-	 * ucode_ver.
-	 */
-	if (IWL_UCODE_SERIAL(mvm->fw->ucode_ver) < 41)
+	if (!iwl_mvm_sar_geo_support(mvm))
 		return 0;
 
 	ret = iwl_mvm_sar_get_wgds_table(mvm);
-- 
2.20.1

[PATCH 02/16] iwlwifi: mvm: prepare the ground for more RSS notifications

[Luca Coelho]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

We will need a new type of synchronization message going
through all the RSS queues. Prepare the ground for this.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/sta.h | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index ac9bc65c4d15..23fd3108adb9 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -2427,7 +2427,7 @@ int iwl_mvm_rm_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 
 static void iwl_mvm_sync_rxq_del_ba(struct iwl_mvm *mvm, u8 baid)
 {
-	struct iwl_mvm_delba_notif notif = {
+	struct iwl_mvm_rss_sync_notif notif = {
 		.metadata.type = IWL_MVM_RXQ_NOTIF_DEL_BA,
 		.metadata.sync = 1,
 		.delba.baid = baid,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index 84139fc38c34..79d655b3fce0 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -343,9 +343,11 @@ struct iwl_mvm_delba_data {
 	u32 baid;
 } __packed;
 
-struct iwl_mvm_delba_notif {
+struct iwl_mvm_rss_sync_notif {
 	struct iwl_mvm_internal_rxq_notif metadata;
-	struct iwl_mvm_delba_data delba;
+	union {
+		struct iwl_mvm_delba_data delba;
+	};
 } __packed;
 
 /**
-- 
2.20.1

[PATCH 03/16] iwlwifi: mvm: add a new RSS sync notification for NSSN sync

[Luca Coelho]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

We will soon be using a new notification that will be
initiated by the driver, sent to the firmware and sent
back to all the RSS queues by the firmware. This new
notification will be useful to synchronize the NSSN across
all the queues.

For now, don't send the notification, just add the code to
handle it. Later patch will add the code to actually send
it.

While at it, validate the baid coming from the firmware to
avoid accessing an array with a bad index in the driver.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 .../net/wireless/intel/iwlwifi/fw/api/rx.h    |  2 +
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  4 +-
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c  |  4 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 84 ++++++++++++-------
 drivers/net/wireless/intel/iwlwifi/mvm/sta.h  |  6 ++
 5 files changed, 64 insertions(+), 36 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
index d55312ef58c9..ed69eec4fcd9 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
@@ -812,10 +812,12 @@ struct iwl_rxq_sync_notification {
  *
  * @IWL_MVM_RXQ_EMPTY: empty sync notification
  * @IWL_MVM_RXQ_NOTIF_DEL_BA: notify RSS queues of delBA
+ * @IWL_MVM_RXQ_NSSN_SYNC: notify all the RSS queues with the new NSSN
  */
 enum iwl_mvm_rxq_notif_type {
 	IWL_MVM_RXQ_EMPTY,
 	IWL_MVM_RXQ_NOTIF_DEL_BA,
+	IWL_MVM_RXQ_NSSN_SYNC,
 };
 
 /**
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 48c77af54e99..c1e8b4766b0c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -1665,8 +1665,8 @@ void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 			      struct iwl_rx_cmd_buffer *rxb, int queue);
 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 			    const u8 *data, u32 count);
-void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
-			    int queue);
+void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi,
+			    struct iwl_rx_cmd_buffer *rxb, int queue);
 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb);
 void iwl_mvm_mfu_assert_dump_notif(struct iwl_mvm *mvm,
 				   struct iwl_rx_cmd_buffer *rxb);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index d7d6f3398f86..4888054dc3d8 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -1088,7 +1088,7 @@ static void iwl_mvm_rx_mq(struct iwl_op_mode *op_mode,
 		iwl_mvm_rx_mpdu_mq(mvm, napi, rxb, 0);
 	else if (unlikely(cmd == WIDE_ID(DATA_PATH_GROUP,
 					 RX_QUEUES_NOTIFICATION)))
-		iwl_mvm_rx_queue_notif(mvm, rxb, 0);
+		iwl_mvm_rx_queue_notif(mvm, napi, rxb, 0);
 	else if (cmd == WIDE_ID(LEGACY_GROUP, FRAME_RELEASE))
 		iwl_mvm_rx_frame_release(mvm, napi, rxb, 0);
 	else if (cmd == WIDE_ID(DATA_PATH_GROUP, RX_NO_DATA_NOTIF))
@@ -1812,7 +1812,7 @@ static void iwl_mvm_rx_mq_rss(struct iwl_op_mode *op_mode,
 		iwl_mvm_rx_frame_release(mvm, napi, rxb, queue);
 	else if (unlikely(cmd == WIDE_ID(DATA_PATH_GROUP,
 					 RX_QUEUES_NOTIFICATION)))
-		iwl_mvm_rx_queue_notif(mvm, rxb, queue);
+		iwl_mvm_rx_queue_notif(mvm, napi, rxb, queue);
 	else if (likely(cmd == WIDE_ID(LEGACY_GROUP, REPLY_RX_MPDU_CMD)))
 		iwl_mvm_rx_mpdu_mq(mvm, napi, rxb, queue);
 }
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 64f950501287..bf097329efa2 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -665,8 +665,51 @@ static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 	rcu_read_unlock();
 }
 
-void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
-			    int queue)
+static void iwl_mvm_release_frames_from_notif(struct iwl_mvm *mvm,
+					      struct napi_struct *napi,
+					      u8 baid, u16 nssn, int queue)
+{
+	struct ieee80211_sta *sta;
+	struct iwl_mvm_reorder_buffer *reorder_buf;
+	struct iwl_mvm_baid_data *ba_data;
+
+	IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
+		     baid, nssn);
+
+	if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID ||
+			 baid >= ARRAY_SIZE(mvm->baid_map)))
+		return;
+
+	rcu_read_lock();
+
+	ba_data = rcu_dereference(mvm->baid_map[baid]);
+	if (WARN_ON_ONCE(!ba_data))
+		goto out;
+
+	sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
+	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
+		goto out;
+
+	reorder_buf = &ba_data->reorder_buf[queue];
+
+	spin_lock_bh(&reorder_buf->lock);
+	iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf, nssn);
+	spin_unlock_bh(&reorder_buf->lock);
+
+out:
+	rcu_read_unlock();
+}
+
+static void iwl_mvm_nssn_sync(struct iwl_mvm *mvm,
+			      struct napi_struct *napi, int queue,
+			      const struct iwl_mvm_nssn_sync_data *data)
+{
+	iwl_mvm_release_frames_from_notif(mvm, napi, data->baid,
+					  data->nssn, queue);
+}
+
+void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi,
+			    struct iwl_rx_cmd_buffer *rxb, int queue)
 {
 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_rxq_sync_notification *notif;
@@ -687,6 +730,10 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 	case IWL_MVM_RXQ_NOTIF_DEL_BA:
 		iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 		break;
+	case IWL_MVM_RXQ_NSSN_SYNC:
+		iwl_mvm_nssn_sync(mvm, napi, queue,
+				  (void *)internal_notif->data);
+		break;
 	default:
 		WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 	}
@@ -1840,40 +1887,13 @@ void iwl_mvm_rx_monitor_no_data(struct iwl_mvm *mvm, struct napi_struct *napi,
 out:
 	rcu_read_unlock();
 }
+
 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 			      struct iwl_rx_cmd_buffer *rxb, int queue)
 {
 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_frame_release *release = (void *)pkt->data;
-	struct ieee80211_sta *sta;
-	struct iwl_mvm_reorder_buffer *reorder_buf;
-	struct iwl_mvm_baid_data *ba_data;
-
-	int baid = release->baid;
 
-	IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
-		     release->baid, le16_to_cpu(release->nssn));
-
-	if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
-		return;
-
-	rcu_read_lock();
-
-	ba_data = rcu_dereference(mvm->baid_map[baid]);
-	if (WARN_ON_ONCE(!ba_data))
-		goto out;
-
-	sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
-	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
-		goto out;
-
-	reorder_buf = &ba_data->reorder_buf[queue];
-
-	spin_lock_bh(&reorder_buf->lock);
-	iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf,
-			       le16_to_cpu(release->nssn));
-	spin_unlock_bh(&reorder_buf->lock);
-
-out:
-	rcu_read_unlock();
+	iwl_mvm_release_frames_from_notif(mvm, napi, release->baid,
+					  le16_to_cpu(release->nssn), queue);
 }
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index 79d655b3fce0..4823c06e6909 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -343,10 +343,16 @@ struct iwl_mvm_delba_data {
 	u32 baid;
 } __packed;
 
+struct iwl_mvm_nssn_sync_data {
+	u32 baid;
+	u32 nssn;
+} __packed;
+
 struct iwl_mvm_rss_sync_notif {
 	struct iwl_mvm_internal_rxq_notif metadata;
 	union {
 		struct iwl_mvm_delba_data delba;
+		struct iwl_mvm_nssn_sync_data nssn_sync;
 	};
 } __packed;
 
-- 
2.20.1

[PATCH 04/16] iwlwiif: mvm: refactor iwl_mvm_notify_rx_queue

[Luca Coelho]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

Instead of allocating memory for which we have an upper
limit, use a small buffer on stack.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/fw/api/rx.h |  1 -
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c  | 17 +++++++++--------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
index ed69eec4fcd9..9b0bb89599fc 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h
@@ -776,7 +776,6 @@ struct iwl_rss_config_cmd {
 	u8 indirection_table[IWL_RSS_INDIRECTION_TABLE_SIZE];
 } __packed; /* RSS_CONFIG_CMD_API_S_VER_1 */
 
-#define IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE 128
 #define IWL_MULTI_QUEUE_SYNC_SENDER_POS 0
 #define IWL_MULTI_QUEUE_SYNC_SENDER_MSK 0xf
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index bf097329efa2..16078aa7c95f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -465,18 +465,20 @@ static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue,
 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 			    const u8 *data, u32 count)
 {
-	struct iwl_rxq_sync_cmd *cmd;
+	u8 buf[sizeof(struct iwl_rxq_sync_cmd) +
+	       sizeof(struct iwl_mvm_rss_sync_notif)];
+	struct iwl_rxq_sync_cmd *cmd = (void *)buf;
 	u32 data_size = sizeof(*cmd) + count;
 	int ret;
 
-	/* should be DWORD aligned */
-	if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
+	/*
+	 * size must be a multiple of DWORD
+	 * Ensure we don't overflow buf
+	 */
+	if (WARN_ON(count & 3 ||
+		    count > sizeof(struct iwl_mvm_rss_sync_notif)))
 		return -EINVAL;
 
-	cmd = kzalloc(data_size, GFP_KERNEL);
-	if (!cmd)
-		return -ENOMEM;
-
 	cmd->rxq_mask = cpu_to_le32(rxq_mask);
 	cmd->count =  cpu_to_le32(count);
 	cmd->flags = 0;
@@ -487,7 +489,6 @@ int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 					   TRIGGER_RX_QUEUES_NOTIF_CMD),
 				   0, data_size, cmd);
 
-	kfree(cmd);
 	return ret;
 }
 
-- 
2.20.1

[PATCH 05/16] iwlwifi: mvm: add a loose synchronization of the NSSN across Rx queues

[Luca Coelho]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

In order to support MSI-X efficiently, we want to avoid
communication across Rx queues. Each Rx queue should have
all the data it needs to process a packet.

The reordering buffer is a challenge in the MSI-X world
since we can have a single BA session whose packets are
directed to different queues. This is why each queue has
its own reordering buffer. The hardware is able to hint
the driver whether we have a hole or not, which allows
the driver to know whether it can release a packet or not.
This indication is called NSSN. Roughly, if the packet's
SN is lower than the NSSN, we can release the packet to
the stack. The NSSN is the SN of the newest packet received
without any holes + 1.

This is working as long as we don't have packets that we
release because of a timeout. When that happens, we could
have taken the decision to release a packet after we have
been waiting for its predecessor for too long. If this
predecessor comes later, we have to drop it because we
can't release packets out of order. In that case, the
hardware will give us an indication that we can we release
the packet (SN < NSSN), but the packet still needs to be
dropped.
This is why we sometimes need to ignore the NSSN and we
track the head_sn in software.
Here is a specific example of this:

1) Rx queue 1 got packets: 480, 482, 483
2) We release 480 to to the stack and wait for 481
3) NSSN is now 481
4) The timeout expires
5) We release 482 and 483, NSSN is still 480
6) 481 arrives its NSSN is 484.

We need to drop 481 even if 481 < 484. This is why we'll
update the head_sn to 484 at step 2. The flow now is:

1) Rx queue 1 got packets: 480, 482, 483
2) We release 480 to to the stack and wait for 481
3) NSSN is now 481 / head_sn is 481
4) The timeout expires
5) We release 482 and 483, NSSN is still 480 but head_sn is 484.
6) 481 arrives its NSSN is 484, but head_sn is 484 and we drop it.

This code introduces another problem in case all the traffic
goes well (no hole, no timeout):

Rx queue 1: 0   -> 483   (head_sn = 484)
Rx queue 2: 501 -> 4095  (head_sn = 0)
Rx queue 2: 0   -> 480   (head_sn = 481)
Rx queue 1: 481 but head_sn = 484 and we drop it.

At this point, the SN of queue 1 is far behind: more than
4040 packets behind. Queue 1 will consider 481 "old"
because 481 is in [501-64:501] whereas it is a very new
packet.

In order to fix that, send an Rx notification from time to
time (twice across the full set of 4096 packets) to make
sure no Rx queue is lagging too far behind.

What will happen then is:

Rx queue 1: 0    -> 483       (head_sn = 484)
Rx queue 2: 501  -> 2047      (head_sn = 2048)
Rx queue 1: Sync nofication   (head_sn = 2048)
Rx queue 2: 2048 -> 4095      (head_sn = 0)
Rx queue 1: Sync notification (head_sn = 0)
Rx queue 2: 1    -> 481       (head_sn = 482)
Rx queue 1: 481 and head_sn = 0.

In queue 1's data, head_sn is now 0, the packet coming in
is 481, it'll understand that the new packet is new and it
won't be dropped.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c |  5 +-
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 64 +++++++++++++++----
 3 files changed, 56 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 99fa440bc639..982682ec74fd 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -5053,7 +5053,6 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 	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;
@@ -5064,13 +5063,15 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 		atomic_set(&mvm->queue_sync_counter,
 			   mvm->trans->num_rx_queues);
 
-	ret = iwl_mvm_notify_rx_queue(mvm, qmask, (u8 *)notif, size);
+	ret = iwl_mvm_notify_rx_queue(mvm, qmask, (u8 *)notif,
+				      size, !notif->sync);
 	if (ret) {
 		IWL_ERR(mvm, "Failed to trigger RX queues sync (%d)\n", ret);
 		goto out;
 	}
 
 	if (notif->sync) {
+		lockdep_assert_held(&mvm->mutex);
 		ret = wait_event_timeout(mvm->rx_sync_waitq,
 					 atomic_read(&mvm->queue_sync_counter) == 0 ||
 					 iwl_mvm_is_radio_killed(mvm),
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index c1e8b4766b0c..fd1764df592f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -1664,7 +1664,7 @@ void iwl_mvm_rx_monitor_no_data(struct iwl_mvm *mvm, struct napi_struct *napi,
 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 			      struct iwl_rx_cmd_buffer *rxb, int queue);
 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
-			    const u8 *data, u32 count);
+			    const u8 *data, u32 count, bool async);
 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi,
 			    struct iwl_rx_cmd_buffer *rxb, int queue);
 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 16078aa7c95f..4f4fdaf49eef 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -463,7 +463,7 @@ static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue,
 }
 
 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
-			    const u8 *data, u32 count)
+			    const u8 *data, u32 count, bool async)
 {
 	u8 buf[sizeof(struct iwl_rxq_sync_cmd) +
 	       sizeof(struct iwl_mvm_rss_sync_notif)];
@@ -487,7 +487,7 @@ int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 	ret = iwl_mvm_send_cmd_pdu(mvm,
 				   WIDE_ID(DATA_PATH_GROUP,
 					   TRIGGER_RX_QUEUES_NOTIF_CMD),
-				   0, data_size, cmd);
+				   async ? CMD_ASYNC : 0, data_size, cmd);
 
 	return ret;
 }
@@ -504,6 +504,18 @@ static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 	       !ieee80211_sn_less(sn1, sn2 - buffer_size);
 }
 
+static void iwl_mvm_sync_nssn(struct iwl_mvm *mvm, u8 baid, u16 nssn)
+{
+	struct iwl_mvm_rss_sync_notif notif = {
+		.metadata.type = IWL_MVM_RXQ_NSSN_SYNC,
+		.metadata.sync = 0,
+		.nssn_sync.baid = baid,
+		.nssn_sync.nssn = nssn,
+	};
+
+	iwl_mvm_sync_rx_queues_internal(mvm, (void *)&notif, sizeof(notif));
+}
+
 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 
 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
@@ -511,7 +523,7 @@ static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 				   struct napi_struct *napi,
 				   struct iwl_mvm_baid_data *baid_data,
 				   struct iwl_mvm_reorder_buffer *reorder_buf,
-				   u16 nssn)
+				   u16 nssn, bool sync_rss)
 {
 	struct iwl_mvm_reorder_buf_entry *entries =
 		&baid_data->entries[reorder_buf->queue *
@@ -530,6 +542,8 @@ static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 		struct sk_buff *skb;
 
 		ssn = ieee80211_sn_inc(ssn);
+		if (sync_rss && (ssn == 2048 || ssn == 0))
+			iwl_mvm_sync_nssn(mvm, baid_data->baid, ssn);
 
 		/*
 		 * Empty the list. Will have more than one frame for A-MSDU.
@@ -616,7 +630,8 @@ void iwl_mvm_reorder_timer_expired(struct timer_list *t)
 			     sta_id, sn);
 		iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif,
 						     sta, baid_data->tid);
-		iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data, buf, sn);
+		iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data,
+				       buf, sn, true);
 		rcu_read_unlock();
 	} else {
 		/*
@@ -658,7 +673,8 @@ static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 	spin_lock_bh(&reorder_buf->lock);
 	iwl_mvm_release_frames(mvm, sta, NULL, ba_data, reorder_buf,
 			       ieee80211_sn_add(reorder_buf->head_sn,
-						reorder_buf->buf_size));
+						reorder_buf->buf_size),
+			       false);
 	spin_unlock_bh(&reorder_buf->lock);
 	del_timer_sync(&reorder_buf->reorder_timer);
 
@@ -694,7 +710,8 @@ static void iwl_mvm_release_frames_from_notif(struct iwl_mvm *mvm,
 	reorder_buf = &ba_data->reorder_buf[queue];
 
 	spin_lock_bh(&reorder_buf->lock);
-	iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf, nssn);
+	iwl_mvm_release_frames(mvm, sta, napi, ba_data,
+			       reorder_buf, nssn, false);
 	spin_unlock_bh(&reorder_buf->lock);
 
 out:
@@ -833,7 +850,8 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	}
 
 	if (ieee80211_is_back_req(hdr->frame_control)) {
-		iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn);
+		iwl_mvm_release_frames(mvm, sta, napi, baid_data,
+				       buffer, nssn, false);
 		goto drop;
 	}
 
@@ -842,7 +860,10 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	 * If the SN is smaller than the NSSN it might need to first go into
 	 * the reorder buffer, in which case we just release up to it and the
 	 * rest of the function will take care of storing it and releasing up to
-	 * the nssn
+	 * the nssn.
+	 * This should not happen. This queue has been lagging and it should
+	 * have been updated by a IWL_MVM_RXQ_NSSN_SYNC notification. Be nice
+	 * and update the other queues.
 	 */
 	if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 				buffer->buf_size) ||
@@ -850,7 +871,7 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 		u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 
 		iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer,
-				       min_sn);
+				       min_sn, true);
 	}
 
 	/* drop any oudated packets */
@@ -861,8 +882,23 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 		if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 				       buffer->buf_size) &&
-		   (!amsdu || last_subframe))
+		   (!amsdu || last_subframe)) {
+			/*
+			 * If we crossed the 2048 or 0 SN, notify all the
+			 * queues. This is done in order to avoid having a
+			 * head_sn that lags behind for too long. When that
+			 * happens, we can get to a situation where the head_sn
+			 * is within the interval [nssn - buf_size : nssn]
+			 * which will make us think that the nssn is a packet
+			 * that we already freed because of the reordering
+			 * buffer and we will ignore it. So maintain the
+			 * head_sn somewhat updated across all the queues:
+			 * when it crosses 0 and 2048.
+			 */
+			if (sn == 2048 || sn == 0)
+				iwl_mvm_sync_nssn(mvm, baid, sn);
 			buffer->head_sn = nssn;
+		}
 		/* No need to update AMSDU last SN - we are moving the head */
 		spin_unlock_bh(&buffer->lock);
 		return false;
@@ -877,8 +913,11 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	 * while technically there is no hole and we can move forward.
 	 */
 	if (!buffer->num_stored && sn == buffer->head_sn) {
-		if (!amsdu || last_subframe)
+		if (!amsdu || last_subframe) {
+			if (sn == 2048 || sn == 0)
+				iwl_mvm_sync_nssn(mvm, baid, sn);
 			buffer->head_sn = ieee80211_sn_inc(buffer->head_sn);
+		}
 		/* No need to update AMSDU last SN - we are moving the head */
 		spin_unlock_bh(&buffer->lock);
 		return false;
@@ -923,7 +962,8 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	 * release notification with up to date NSSN.
 	 */
 	if (!amsdu || last_subframe)
-		iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn);
+		iwl_mvm_release_frames(mvm, sta, napi, baid_data,
+				       buffer, nssn, true);
 
 	spin_unlock_bh(&buffer->lock);
 	return true;
-- 
2.20.1

[PATCH 06/16] iwlwifi: mvm: add a wrapper around rs_tx_status to handle locks

[Luca Coelho]

From: Gregory Greenman <gregory.greenman@intel.com>

iwl_mvm_rs_tx_status can be called from two places in the code, but the
mutex is taken only on one of the calls. Split it into a wrapper taking
locks and an internal __iwl_mvm_rs_tx_status function.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c | 28 ++++++++++++++-------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index 02b4ef92543f..b50a47e86ef0 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -1218,8 +1218,10 @@ void iwl_mvm_rs_init_wk(struct work_struct *wk)
 	rcu_read_unlock();
 }
 
-void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			  int tid, struct ieee80211_tx_info *info, bool ndp)
+static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
+				   struct ieee80211_sta *sta,
+				   int tid, struct ieee80211_tx_info *info,
+				   bool ndp)
 {
 	int legacy_success;
 	int retries;
@@ -1451,6 +1453,21 @@ void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
 }
 
+void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
+			  int tid, struct ieee80211_tx_info *info, bool ndp)
+{
+	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
+
+	/* If it's locked we are in middle of init flow
+	 * just wait for next tx status to update the lq_sta data
+	 */
+	if (!mutex_trylock(&mvmsta->lq_sta.rs_drv.mutex))
+		return;
+
+	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
+	mutex_unlock(&mvmsta->lq_sta.rs_drv.mutex);
+}
+
 /*
  * mac80211 sends us Tx status
  */
@@ -1472,15 +1489,8 @@ static void rs_drv_mac80211_tx_status(void *mvm_r,
 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
 		return;
 
-	/* If it's locked we are in middle of init flow
-	 * just wait for next tx status to update the lq_sta data
-	 */
-	if (!mutex_trylock(&mvmsta->lq_sta.rs_drv.mutex))
-		return;
-
 	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
 			     ieee80211_is_qos_nullfunc(hdr->frame_control));
-	mutex_unlock(&mvmsta->lq_sta.rs_drv.mutex);
 }
 
 /*
-- 
2.20.1

[PATCH 07/16] iwlwifi: dbg_ini: move iwl_dbg_tlv_load_bin out of debug override ifdef

[Luca Coelho]

From: Shahar S Matityahu <shahar.s.matityahu@intel.com>

ini debug mode should work even if debug override is not defined.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Fixes: 68f6f492c4fa ("iwlwifi: trans: support loading ini TLVs from external file")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index 57d09049e615..d91686b9a540 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1640,6 +1640,8 @@ struct iwl_drv *iwl_drv_start(struct iwl_trans *trans)
 	init_completion(&drv->request_firmware_complete);
 	INIT_LIST_HEAD(&drv->list);
 
+	iwl_load_fw_dbg_tlv(drv->trans->dev, drv->trans);
+
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	/* Create the device debugfs entries. */
 	drv->dbgfs_drv = debugfs_create_dir(dev_name(trans->dev),
-- 
2.20.1

[PATCH 08/16] iwlwifi: dbg_ini: move iwl_dbg_tlv_free outside of debugfs ifdef

[Luca Coelho]

From: Shahar S Matityahu <shahar.s.matityahu@intel.com>

The driver should call iwl_dbg_tlv_free even if debugfs is not defined
since ini mode does not depend on debugfs ifdef.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Fixes: 68f6f492c4fa ("iwlwifi: trans: support loading ini TLVs from external file")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index d91686b9a540..38672dd5aae9 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1662,8 +1662,8 @@ struct iwl_drv *iwl_drv_start(struct iwl_trans *trans)
 err_fw:
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	debugfs_remove_recursive(drv->dbgfs_drv);
-	iwl_fw_dbg_free(drv->trans);
 #endif
+	iwl_fw_dbg_free(drv->trans);
 	kfree(drv);
 err:
 	return ERR_PTR(ret);
-- 
2.20.1

[PATCH 09/16] iwlwifi: fix locking in delayed GTK setting

[Luca Coelho]

From: Johannes Berg <johannes.berg@intel.com>

This code clearly never could have worked, since it locks
while already locked. Add an unlocked __iwl_mvm_mac_set_key()
variant that doesn't do locking to fix that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 39 ++++++++++++-------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 982682ec74fd..1c904b5226aa 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -207,11 +207,11 @@ static const struct cfg80211_pmsr_capabilities iwl_mvm_pmsr_capa = {
 	},
 };
 
-static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
-			       enum set_key_cmd cmd,
-			       struct ieee80211_vif *vif,
-			       struct ieee80211_sta *sta,
-			       struct ieee80211_key_conf *key);
+static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+				 enum set_key_cmd cmd,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_sta *sta,
+				 struct ieee80211_key_conf *key);
 
 void iwl_mvm_ref(struct iwl_mvm *mvm, enum iwl_mvm_ref_type ref_type)
 {
@@ -2738,7 +2738,7 @@ static int iwl_mvm_start_ap_ibss(struct ieee80211_hw *hw,
 
 		mvmvif->ap_early_keys[i] = NULL;
 
-		ret = iwl_mvm_mac_set_key(hw, SET_KEY, vif, NULL, key);
+		ret = __iwl_mvm_mac_set_key(hw, SET_KEY, vif, NULL, key);
 		if (ret)
 			goto out_quota_failed;
 	}
@@ -3506,11 +3506,11 @@ static int iwl_mvm_mac_sched_scan_stop(struct ieee80211_hw *hw,
 	return ret;
 }
 
-static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
-			       enum set_key_cmd cmd,
-			       struct ieee80211_vif *vif,
-			       struct ieee80211_sta *sta,
-			       struct ieee80211_key_conf *key)
+static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+				 enum set_key_cmd cmd,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_sta *sta,
+				 struct ieee80211_key_conf *key)
 {
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
@@ -3565,8 +3565,6 @@ static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
 			return -EOPNOTSUPP;
 	}
 
-	mutex_lock(&mvm->mutex);
-
 	switch (cmd) {
 	case SET_KEY:
 		if ((vif->type == NL80211_IFTYPE_ADHOC ||
@@ -3712,7 +3710,22 @@ static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
 		ret = -EINVAL;
 	}
 
+	return ret;
+}
+
+static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+			       enum set_key_cmd cmd,
+			       struct ieee80211_vif *vif,
+			       struct ieee80211_sta *sta,
+			       struct ieee80211_key_conf *key)
+{
+	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
+	int ret;
+
+	mutex_lock(&mvm->mutex);
+	ret = __iwl_mvm_mac_set_key(hw, cmd, vif, sta, key);
 	mutex_unlock(&mvm->mutex);
+
 	return ret;
 }
 
-- 
2.20.1

[PATCH 10/16] iwlwifi: mvm: fix comparison of u32 variable with less than zero

[Luca Coelho]

From: Colin Ian King <colin.king@canonical.com>

The comparison of the u32 variable wgds_tbl_idx with less than zero is
always going to be false because it is unsigned.  Fix this by making
wgds_tbl_idx a plain signed int.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 4fd445a2c855 ("iwlwifi: mvm: Add log information about SAR status")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/nvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c b/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
index 719f793b3487..a9bb43a2f27b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
@@ -620,7 +620,7 @@ void iwl_mvm_rx_chub_update_mcc(struct iwl_mvm *mvm,
 	enum iwl_mcc_source src;
 	char mcc[3];
 	struct ieee80211_regdomain *regd;
-	u32 wgds_tbl_idx;
+	int wgds_tbl_idx;
 
 	lockdep_assert_held(&mvm->mutex);
 
-- 
2.20.1

[PATCH 11/16] iwlwifi: mvm: send LQ command always ASYNC

[Luca Coelho]

From: Gregory Greenman <gregory.greenman@intel.com>

The only place where the command was sent as SYNC is during
init and this is not really critical. This change is required
for replacing RS mutex with a spinlock (in the subsequent patch),
since SYNC comamnd requres sleeping and thus the flow cannot
be done when holding a spinlock.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c   | 23 ++++++++++---------
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c  |  2 +-
 .../net/wireless/intel/iwlwifi/mvm/utils.c    |  4 ++--
 4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index fd1764df592f..a263cc629d75 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -1813,7 +1813,7 @@ iwl_mvm_vif_dbgfs_clean(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 #endif /* CONFIG_IWLWIFI_DEBUGFS */
 
 /* rate scaling */
-int iwl_mvm_send_lq_cmd(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq, bool sync);
+int iwl_mvm_send_lq_cmd(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq);
 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg);
 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate);
 void rs_update_last_rssi(struct iwl_mvm *mvm,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index b50a47e86ef0..bd977ec8629b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -1328,7 +1328,7 @@ static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
 			IWL_DEBUG_RATE(mvm,
 				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
 				       lq_sta->rs_state);
-			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
+			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
 		}
 		/* Regardless, ignore this status info for outdated rate */
 		return;
@@ -1390,7 +1390,8 @@ static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
 		if (info->status.ampdu_ack_len == 0)
 			info->status.ampdu_len = 1;
 
-		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
+		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
+				    tx_resp_rate.index,
 				    info->status.ampdu_len,
 				    info->status.ampdu_ack_len);
 
@@ -1833,7 +1834,7 @@ static void rs_update_rate_tbl(struct iwl_mvm *mvm,
 			       struct iwl_scale_tbl_info *tbl)
 {
 	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
-	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
+	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
 }
 
 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
@@ -2935,7 +2936,7 @@ void rs_update_last_rssi(struct iwl_mvm *mvm,
 static void rs_initialize_lq(struct iwl_mvm *mvm,
 			     struct ieee80211_sta *sta,
 			     struct iwl_lq_sta *lq_sta,
-			     enum nl80211_band band, bool update)
+			     enum nl80211_band band)
 {
 	struct iwl_scale_tbl_info *tbl;
 	struct rs_rate *rate;
@@ -2965,7 +2966,7 @@ static void rs_initialize_lq(struct iwl_mvm *mvm,
 	rs_set_expected_tpt_table(lq_sta, tbl);
 	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
 	/* TODO restore station should remember the lq cmd */
-	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
+	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
 }
 
 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
@@ -3214,7 +3215,7 @@ void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
  * Called after adding a new station to initialize rate scaling
  */
 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			     enum nl80211_band band, bool update)
+			     enum nl80211_band band)
 {
 	int i, j;
 	struct ieee80211_hw *hw = mvm->hw;
@@ -3294,7 +3295,7 @@ static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	iwl_mvm_reset_frame_stats(mvm);
 #endif
-	rs_initialize_lq(mvm, sta, lq_sta, band, update);
+	rs_initialize_lq(mvm, sta, lq_sta, band);
 }
 
 static void rs_drv_rate_update(void *mvm_r,
@@ -3608,7 +3609,7 @@ static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
 
 		bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
 		bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
-		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
+		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
 
 		ss_params |= LQ_SS_BFER_ALLOWED;
 		IWL_DEBUG_RATE(mvm,
@@ -3774,7 +3775,7 @@ static void rs_program_fix_rate(struct iwl_mvm *mvm,
 
 	if (lq_sta->pers.dbg_fixed_rate) {
 		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
-		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
+		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
 	}
 }
 
@@ -4177,7 +4178,7 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 
 		mutex_lock(&mvmsta->lq_sta.rs_drv.mutex);
-		rs_drv_rate_init(mvm, sta, band, update);
+		rs_drv_rate_init(mvm, sta, band);
 		mutex_unlock(&mvmsta->lq_sta.rs_drv.mutex);
 	}
 }
@@ -4209,7 +4210,7 @@ static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
 	}
 
-	return iwl_mvm_send_lq_cmd(mvm, lq, false);
+	return iwl_mvm_send_lq_cmd(mvm, lq);
 }
 
 /**
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 23fd3108adb9..88d16b5442e7 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -2978,7 +2978,7 @@ int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	IWL_DEBUG_HT(mvm, "Tx aggregation enabled on ra = %pM tid = %d\n",
 		     sta->addr, tid);
 
-	return iwl_mvm_send_lq_cmd(mvm, &mvmsta->lq_sta.rs_drv.lq, false);
+	return iwl_mvm_send_lq_cmd(mvm, &mvmsta->lq_sta.rs_drv.lq);
 }
 
 static void iwl_mvm_unreserve_agg_queue(struct iwl_mvm *mvm,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
index 9ecd5f09615a..b8e20a01c192 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
@@ -653,12 +653,12 @@ int iwl_mvm_reconfig_scd(struct iwl_mvm *mvm, int queue, int fifo, int sta_id,
  * this case to clear the state indicating that station creation is in
  * progress.
  */
-int iwl_mvm_send_lq_cmd(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq, bool sync)
+int iwl_mvm_send_lq_cmd(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq)
 {
 	struct iwl_host_cmd cmd = {
 		.id = LQ_CMD,
 		.len = { sizeof(struct iwl_lq_cmd), },
-		.flags = sync ? 0 : CMD_ASYNC,
+		.flags = CMD_ASYNC,
 		.data = { lq, },
 	};
 
-- 
2.20.1

[PATCH 12/16] iwlwifi: mvm: replace RS mutex with a spin_lock

[Luca Coelho]

From: Gregory Greenman <gregory.greenman@intel.com>

The solution with the worker still had a bug, as in order
to get sta, rcu_read_lock should be used and thus no mutex
can be used inside iwl_mvm_rs_rate_init.

Also, spin_lock is a simpler solution, no need to spawn a
dedicated worker.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c  | 530 +++++++++----------
 drivers/net/wireless/intel/iwlwifi/mvm/rs.h  |   6 +-
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c |   6 +-
 drivers/net/wireless/intel/iwlwifi/mvm/sta.h |   1 -
 4 files changed, 258 insertions(+), 285 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index bd977ec8629b..3fa50b1955bb 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -1197,278 +1197,6 @@ static u8 rs_get_tid(struct ieee80211_hdr *hdr)
 	return tid;
 }
 
-void iwl_mvm_rs_init_wk(struct work_struct *wk)
-{
-	struct iwl_mvm_sta *mvmsta = container_of(wk, struct iwl_mvm_sta,
-						  rs_init_wk);
-	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
-	struct ieee80211_sta *sta;
-
-	rcu_read_lock();
-
-	sta = rcu_dereference(mvmvif->mvm->fw_id_to_mac_id[mvmsta->sta_id]);
-	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
-		rcu_read_unlock();
-		return;
-	}
-
-	iwl_mvm_rs_rate_init(mvmvif->mvm, sta, mvmvif->phy_ctxt->channel->band,
-			     true);
-
-	rcu_read_unlock();
-}
-
-static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
-				   struct ieee80211_sta *sta,
-				   int tid, struct ieee80211_tx_info *info,
-				   bool ndp)
-{
-	int legacy_success;
-	int retries;
-	int i;
-	struct iwl_lq_cmd *table;
-	u32 lq_hwrate;
-	struct rs_rate lq_rate, tx_resp_rate;
-	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
-	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
-	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
-	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
-	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
-	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
-	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
-
-	/* Treat uninitialized rate scaling data same as non-existing. */
-	if (!lq_sta) {
-		IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
-		return;
-	} else if (!lq_sta->pers.drv) {
-		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
-		return;
-	}
-
-	/* This packet was aggregated but doesn't carry status info */
-	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
-	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
-		return;
-
-	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
-				    &tx_resp_rate)) {
-		WARN_ON_ONCE(1);
-		return;
-	}
-
-#ifdef CONFIG_MAC80211_DEBUGFS
-	/* Disable last tx check if we are debugging with fixed rate but
-	 * update tx stats */
-	if (lq_sta->pers.dbg_fixed_rate) {
-		int index = tx_resp_rate.index;
-		enum rs_column column;
-		int attempts, success;
-
-		column = rs_get_column_from_rate(&tx_resp_rate);
-		if (WARN_ONCE(column == RS_COLUMN_INVALID,
-			      "Can't map rate 0x%x to column",
-			      tx_resp_hwrate))
-			return;
-
-		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
-			attempts = info->status.ampdu_len;
-			success = info->status.ampdu_ack_len;
-		} else {
-			attempts = info->status.rates[0].count;
-			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
-		}
-
-		lq_sta->pers.tx_stats[column][index].total += attempts;
-		lq_sta->pers.tx_stats[column][index].success += success;
-
-		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
-			       tx_resp_hwrate, success, attempts);
-		return;
-	}
-#endif
-
-	if (time_after(jiffies,
-		       (unsigned long)(lq_sta->last_tx +
-				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
-		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
-		schedule_work(&mvmsta->rs_init_wk);
-		return;
-	}
-	lq_sta->last_tx = jiffies;
-
-	/* Ignore this Tx frame response if its initial rate doesn't match
-	 * that of latest Link Quality command.  There may be stragglers
-	 * from a previous Link Quality command, but we're no longer interested
-	 * in those; they're either from the "active" mode while we're trying
-	 * to check "search" mode, or a prior "search" mode after we've moved
-	 * to a new "search" mode (which might become the new "active" mode).
-	 */
-	table = &lq_sta->lq;
-	lq_hwrate = le32_to_cpu(table->rs_table[0]);
-	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
-		WARN_ON_ONCE(1);
-		return;
-	}
-
-	/* Here we actually compare this rate to the latest LQ command */
-	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
-		IWL_DEBUG_RATE(mvm,
-			       "tx resp color 0x%x does not match 0x%x\n",
-			       lq_color, LQ_FLAG_COLOR_GET(table->flags));
-
-		/*
-		 * Since rates mis-match, the last LQ command may have failed.
-		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
-		 * ... driver.
-		 */
-		lq_sta->missed_rate_counter++;
-		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
-			lq_sta->missed_rate_counter = 0;
-			IWL_DEBUG_RATE(mvm,
-				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
-				       lq_sta->rs_state);
-			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
-		}
-		/* Regardless, ignore this status info for outdated rate */
-		return;
-	} else
-		/* Rate did match, so reset the missed_rate_counter */
-		lq_sta->missed_rate_counter = 0;
-
-	if (!lq_sta->search_better_tbl) {
-		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
-		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
-	} else {
-		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
-		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
-	}
-
-	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
-		IWL_DEBUG_RATE(mvm,
-			       "Neither active nor search matches tx rate\n");
-		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
-		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
-		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
-		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
-		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
-
-		/*
-		 * no matching table found, let's by-pass the data collection
-		 * and continue to perform rate scale to find the rate table
-		 */
-		rs_stay_in_table(lq_sta, true);
-		goto done;
-	}
-
-	/*
-	 * Updating the frame history depends on whether packets were
-	 * aggregated.
-	 *
-	 * For aggregation, all packets were transmitted at the same rate, the
-	 * first index into rate scale table.
-	 */
-	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
-		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
-				    info->status.ampdu_len,
-				    info->status.ampdu_ack_len,
-				    reduced_txp);
-
-		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
-		 * it as a single frame loss as we don't want the success ratio
-		 * to dip too quickly because a BA wasn't received.
-		 * For TPC, there's no need for this optimisation since we want
-		 * to recover very quickly from a bad power reduction and,
-		 * therefore we'd like the success ratio to get an immediate hit
-		 * when failing to get a BA, so we'd switch back to a lower or
-		 * zero power reduction. When FW transmits agg with a rate
-		 * different from the initial rate, it will not use reduced txp
-		 * and will send BA notification twice (one empty with reduced
-		 * txp equal to the value from LQ and one with reduced txp 0).
-		 * We need to update counters for each txp level accordingly.
-		 */
-		if (info->status.ampdu_ack_len == 0)
-			info->status.ampdu_len = 1;
-
-		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
-				    tx_resp_rate.index,
-				    info->status.ampdu_len,
-				    info->status.ampdu_ack_len);
-
-		/* Update success/fail counts if not searching for new mode */
-		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
-			lq_sta->total_success += info->status.ampdu_ack_len;
-			lq_sta->total_failed += (info->status.ampdu_len -
-					info->status.ampdu_ack_len);
-		}
-	} else {
-		/* For legacy, update frame history with for each Tx retry. */
-		retries = info->status.rates[0].count - 1;
-		/* HW doesn't send more than 15 retries */
-		retries = min(retries, 15);
-
-		/* The last transmission may have been successful */
-		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
-		/* Collect data for each rate used during failed TX attempts */
-		for (i = 0; i <= retries; ++i) {
-			lq_hwrate = le32_to_cpu(table->rs_table[i]);
-			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
-						    &lq_rate)) {
-				WARN_ON_ONCE(1);
-				return;
-			}
-
-			/*
-			 * Only collect stats if retried rate is in the same RS
-			 * table as active/search.
-			 */
-			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
-				tmp_tbl = curr_tbl;
-			else if (rs_rate_column_match(&lq_rate,
-						      &other_tbl->rate))
-				tmp_tbl = other_tbl;
-			else
-				continue;
-
-			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
-					    tx_resp_rate.index, 1,
-					    i < retries ? 0 : legacy_success,
-					    reduced_txp);
-			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
-					    tx_resp_rate.index, 1,
-					    i < retries ? 0 : legacy_success);
-		}
-
-		/* Update success/fail counts if not searching for new mode */
-		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
-			lq_sta->total_success += legacy_success;
-			lq_sta->total_failed += retries + (1 - legacy_success);
-		}
-	}
-	/* The last TX rate is cached in lq_sta; it's set in if/else above */
-	lq_sta->last_rate_n_flags = lq_hwrate;
-	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
-done:
-	/* See if there's a better rate or modulation mode to try. */
-	if (sta->supp_rates[info->band])
-		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
-}
-
-void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			  int tid, struct ieee80211_tx_info *info, bool ndp)
-{
-	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
-
-	/* If it's locked we are in middle of init flow
-	 * just wait for next tx status to update the lq_sta data
-	 */
-	if (!mutex_trylock(&mvmsta->lq_sta.rs_drv.mutex))
-		return;
-
-	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
-	mutex_unlock(&mvmsta->lq_sta.rs_drv.mutex);
-}
-
 /*
  * mac80211 sends us Tx status
  */
@@ -3226,6 +2954,8 @@ static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	struct ieee80211_supported_band *sband;
 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
 
+	lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
+
 	/* clear all non-persistent lq data */
 	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
 
@@ -3318,6 +3048,258 @@ static void rs_drv_rate_update(void *mvm_r,
 	iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
 }
 
+static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
+				   struct ieee80211_sta *sta,
+				   int tid, struct ieee80211_tx_info *info,
+				   bool ndp)
+{
+	int legacy_success;
+	int retries;
+	int i;
+	struct iwl_lq_cmd *table;
+	u32 lq_hwrate;
+	struct rs_rate lq_rate, tx_resp_rate;
+	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
+	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
+	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
+	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
+	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
+	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
+	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
+
+	/* Treat uninitialized rate scaling data same as non-existing. */
+	if (!lq_sta) {
+		IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
+		return;
+	} else if (!lq_sta->pers.drv) {
+		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
+		return;
+	}
+
+	/* This packet was aggregated but doesn't carry status info */
+	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
+	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
+		return;
+
+	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
+				    &tx_resp_rate)) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+	/* Disable last tx check if we are debugging with fixed rate but
+	 * update tx stats
+	 */
+	if (lq_sta->pers.dbg_fixed_rate) {
+		int index = tx_resp_rate.index;
+		enum rs_column column;
+		int attempts, success;
+
+		column = rs_get_column_from_rate(&tx_resp_rate);
+		if (WARN_ONCE(column == RS_COLUMN_INVALID,
+			      "Can't map rate 0x%x to column",
+			      tx_resp_hwrate))
+			return;
+
+		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
+			attempts = info->status.ampdu_len;
+			success = info->status.ampdu_ack_len;
+		} else {
+			attempts = info->status.rates[0].count;
+			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
+		}
+
+		lq_sta->pers.tx_stats[column][index].total += attempts;
+		lq_sta->pers.tx_stats[column][index].success += success;
+
+		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
+			       tx_resp_hwrate, success, attempts);
+		return;
+	}
+#endif
+
+	if (time_after(jiffies,
+		       (unsigned long)(lq_sta->last_tx +
+				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
+		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
+		/* reach here only in case of driver RS, call directly
+		 * the unlocked version
+		 */
+		rs_drv_rate_init(mvm, sta, info->band);
+		return;
+	}
+	lq_sta->last_tx = jiffies;
+
+	/* Ignore this Tx frame response if its initial rate doesn't match
+	 * that of latest Link Quality command.  There may be stragglers
+	 * from a previous Link Quality command, but we're no longer interested
+	 * in those; they're either from the "active" mode while we're trying
+	 * to check "search" mode, or a prior "search" mode after we've moved
+	 * to a new "search" mode (which might become the new "active" mode).
+	 */
+	table = &lq_sta->lq;
+	lq_hwrate = le32_to_cpu(table->rs_table[0]);
+	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+
+	/* Here we actually compare this rate to the latest LQ command */
+	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
+		IWL_DEBUG_RATE(mvm,
+			       "tx resp color 0x%x does not match 0x%x\n",
+			       lq_color, LQ_FLAG_COLOR_GET(table->flags));
+
+		/* Since rates mis-match, the last LQ command may have failed.
+		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
+		 * ... driver.
+		 */
+		lq_sta->missed_rate_counter++;
+		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
+			lq_sta->missed_rate_counter = 0;
+			IWL_DEBUG_RATE(mvm,
+				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
+				       lq_sta->rs_state);
+			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
+		}
+		/* Regardless, ignore this status info for outdated rate */
+		return;
+	}
+
+	/* Rate did match, so reset the missed_rate_counter */
+	lq_sta->missed_rate_counter = 0;
+
+	if (!lq_sta->search_better_tbl) {
+		curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
+		other_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+	} else {
+		curr_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+		other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
+	}
+
+	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
+		IWL_DEBUG_RATE(mvm,
+			       "Neither active nor search matches tx rate\n");
+		tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
+		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
+		tmp_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
+		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
+
+		/* no matching table found, let's by-pass the data collection
+		 * and continue to perform rate scale to find the rate table
+		 */
+		rs_stay_in_table(lq_sta, true);
+		goto done;
+	}
+
+	/* Updating the frame history depends on whether packets were
+	 * aggregated.
+	 *
+	 * For aggregation, all packets were transmitted at the same rate, the
+	 * first index into rate scale table.
+	 */
+	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
+		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
+				    info->status.ampdu_len,
+				    info->status.ampdu_ack_len,
+				    reduced_txp);
+
+		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
+		 * it as a single frame loss as we don't want the success ratio
+		 * to dip too quickly because a BA wasn't received.
+		 * For TPC, there's no need for this optimisation since we want
+		 * to recover very quickly from a bad power reduction and,
+		 * therefore we'd like the success ratio to get an immediate hit
+		 * when failing to get a BA, so we'd switch back to a lower or
+		 * zero power reduction. When FW transmits agg with a rate
+		 * different from the initial rate, it will not use reduced txp
+		 * and will send BA notification twice (one empty with reduced
+		 * txp equal to the value from LQ and one with reduced txp 0).
+		 * We need to update counters for each txp level accordingly.
+		 */
+		if (info->status.ampdu_ack_len == 0)
+			info->status.ampdu_len = 1;
+
+		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
+				    tx_resp_rate.index,
+				    info->status.ampdu_len,
+				    info->status.ampdu_ack_len);
+
+		/* Update success/fail counts if not searching for new mode */
+		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
+			lq_sta->total_success += info->status.ampdu_ack_len;
+			lq_sta->total_failed += (info->status.ampdu_len -
+					info->status.ampdu_ack_len);
+		}
+	} else {
+		/* For legacy, update frame history with for each Tx retry. */
+		retries = info->status.rates[0].count - 1;
+		/* HW doesn't send more than 15 retries */
+		retries = min(retries, 15);
+
+		/* The last transmission may have been successful */
+		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
+		/* Collect data for each rate used during failed TX attempts */
+		for (i = 0; i <= retries; ++i) {
+			lq_hwrate = le32_to_cpu(table->rs_table[i]);
+			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
+						    &lq_rate)) {
+				WARN_ON_ONCE(1);
+				return;
+			}
+
+			/* Only collect stats if retried rate is in the same RS
+			 * table as active/search.
+			 */
+			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
+				tmp_tbl = curr_tbl;
+			else if (rs_rate_column_match(&lq_rate,
+						      &other_tbl->rate))
+				tmp_tbl = other_tbl;
+			else
+				continue;
+
+			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
+					    tx_resp_rate.index, 1,
+					    i < retries ? 0 : legacy_success,
+					    reduced_txp);
+			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
+					    tx_resp_rate.index, 1,
+					    i < retries ? 0 : legacy_success);
+		}
+
+		/* Update success/fail counts if not searching for new mode */
+		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
+			lq_sta->total_success += legacy_success;
+			lq_sta->total_failed += retries + (1 - legacy_success);
+		}
+	}
+	/* The last TX rate is cached in lq_sta; it's set in if/else above */
+	lq_sta->last_rate_n_flags = lq_hwrate;
+	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
+done:
+	/* See if there's a better rate or modulation mode to try. */
+	if (sta->supp_rates[info->band])
+		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
+}
+
+void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
+			  int tid, struct ieee80211_tx_info *info, bool ndp)
+{
+	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
+
+	/* If it's locked we are in middle of init flow
+	 * just wait for next tx status to update the lq_sta data
+	 */
+	if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
+		return;
+
+	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
+	spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
+}
+
 #ifdef CONFIG_MAC80211_DEBUGFS
 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
 					    struct iwl_lq_cmd *lq_cmd,
@@ -4177,9 +4159,9 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	} else {
 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 
-		mutex_lock(&mvmsta->lq_sta.rs_drv.mutex);
+		spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
 		rs_drv_rate_init(mvm, sta, band);
-		mutex_unlock(&mvmsta->lq_sta.rs_drv.mutex);
+		spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
 	}
 }
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.h b/drivers/net/wireless/intel/iwlwifi/mvm/rs.h
index 086f47e2a4f0..428642e66658 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.h
@@ -376,9 +376,6 @@ struct iwl_lq_sta {
 	/* tx power reduce for this sta */
 	int tpc_reduce;
 
-	/* avoid races of reinit and update table from rx_tx */
-	struct mutex mutex;
-
 	/* persistent fields - initialized only once - keep last! */
 	struct lq_sta_pers {
 #ifdef CONFIG_MAC80211_DEBUGFS
@@ -393,6 +390,7 @@ struct iwl_lq_sta {
 		s8 last_rssi;
 		struct rs_rate_stats tx_stats[RS_COLUMN_COUNT][IWL_RATE_COUNT];
 		struct iwl_mvm *drv;
+		spinlock_t lock; /* for races in reinit/update table */
 	} pers;
 };
 
@@ -443,8 +441,6 @@ struct iwl_mvm_sta;
 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 			  bool enable);
 
-void iwl_mvm_rs_init_wk(struct work_struct *wk);
-
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm);
 #endif
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 88d16b5442e7..10f18536dd0d 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -1685,9 +1685,7 @@ int iwl_mvm_add_sta(struct iwl_mvm *mvm,
 	if (iwl_mvm_has_tlc_offload(mvm))
 		iwl_mvm_rs_add_sta(mvm, mvm_sta);
 	else
-		mutex_init(&mvm_sta->lq_sta.rs_drv.mutex);
-
-	INIT_WORK(&mvm_sta->rs_init_wk, iwl_mvm_rs_init_wk);
+		spin_lock_init(&mvm_sta->lq_sta.rs_drv.pers.lock);
 
 	iwl_mvm_toggle_tx_ant(mvm, &mvm_sta->tx_ant);
 
@@ -1850,8 +1848,6 @@ int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
 	if (ret)
 		return ret;
 
-	cancel_work_sync(&mvm_sta->rs_init_wk);
-
 	/* flush its queues here since we are freeing mvm_sta */
 	ret = iwl_mvm_flush_sta(mvm, mvm_sta, false, 0);
 	if (ret)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index 4823c06e6909..8d70093847cb 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -432,7 +432,6 @@ struct iwl_mvm_sta {
 		struct iwl_lq_sta_rs_fw rs_fw;
 		struct iwl_lq_sta rs_drv;
 	} lq_sta;
-	struct work_struct rs_init_wk;
 	struct ieee80211_vif *vif;
 	struct iwl_mvm_key_pn __rcu *ptk_pn[4];
 	struct iwl_mvm_rxq_dup_data *dup_data;
-- 
2.20.1

[PATCH 13/16] iwlwifi: mvm: fix frame drop from the reordering buffer

[Luca Coelho]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

An earlier patch made sure that the queues are not lagging
too far behind. This means that iwl_mvm_release_frames
should not be called with a head_sn too far behind NSSN.

Don't take the risk to change completely the entry
condition to iwl_mvm_release_frames, but don't update
the head_sn is the NSSN is more than 2048 packets ahead
of us. Since this just cannot be right. This means that
the scenario described here happened. We are queue 0.

	Q:0				Q:1
	head_sn: 0    -> 2047
					head_sn: 2048

	Lots of packets arrive:
	head_sn: 2047 -> 2150

					send NSSN_SYNC notification

	Handle notification
	from the firmware and
	do NOT move the head_sn
	back to 2048

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 44 ++++++++++++++-----
 1 file changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 4f4fdaf49eef..854edd7d7103 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -518,12 +518,17 @@ static void iwl_mvm_sync_nssn(struct iwl_mvm *mvm, u8 baid, u16 nssn)
 
 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 
+enum iwl_mvm_release_flags {
+	IWL_MVM_RELEASE_SEND_RSS_SYNC = BIT(0),
+	IWL_MVM_RELEASE_FROM_RSS_SYNC = BIT(1),
+};
+
 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 				   struct ieee80211_sta *sta,
 				   struct napi_struct *napi,
 				   struct iwl_mvm_baid_data *baid_data,
 				   struct iwl_mvm_reorder_buffer *reorder_buf,
-				   u16 nssn, bool sync_rss)
+				   u16 nssn, u32 flags)
 {
 	struct iwl_mvm_reorder_buf_entry *entries =
 		&baid_data->entries[reorder_buf->queue *
@@ -532,6 +537,18 @@ static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 
 	lockdep_assert_held(&reorder_buf->lock);
 
+	/*
+	 * We keep the NSSN not too far behind, if we are sync'ing it and it
+	 * is more than 2048 ahead of us, it must be behind us. Discard it.
+	 * This can happen if the queue that hit the 0 / 2048 seqno was lagging
+	 * behind and this queue already processed packets. The next if
+	 * would have caught cases where this queue would have processed less
+	 * than 64 packets, but it may have processed more than 64 packets.
+	 */
+	if ((flags & IWL_MVM_RELEASE_FROM_RSS_SYNC) &&
+	    ieee80211_sn_less(nssn, ssn))
+		goto set_timer;
+
 	/* ignore nssn smaller than head sn - this can happen due to timeout */
 	if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 		goto set_timer;
@@ -542,7 +559,8 @@ static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 		struct sk_buff *skb;
 
 		ssn = ieee80211_sn_inc(ssn);
-		if (sync_rss && (ssn == 2048 || ssn == 0))
+		if ((flags & IWL_MVM_RELEASE_SEND_RSS_SYNC) &&
+		    (ssn == 2048 || ssn == 0))
 			iwl_mvm_sync_nssn(mvm, baid_data->baid, ssn);
 
 		/*
@@ -631,7 +649,7 @@ void iwl_mvm_reorder_timer_expired(struct timer_list *t)
 		iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif,
 						     sta, baid_data->tid);
 		iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data,
-				       buf, sn, true);
+				       buf, sn, IWL_MVM_RELEASE_SEND_RSS_SYNC);
 		rcu_read_unlock();
 	} else {
 		/*
@@ -674,7 +692,7 @@ static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 	iwl_mvm_release_frames(mvm, sta, NULL, ba_data, reorder_buf,
 			       ieee80211_sn_add(reorder_buf->head_sn,
 						reorder_buf->buf_size),
-			       false);
+			       0);
 	spin_unlock_bh(&reorder_buf->lock);
 	del_timer_sync(&reorder_buf->reorder_timer);
 
@@ -684,7 +702,8 @@ static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 
 static void iwl_mvm_release_frames_from_notif(struct iwl_mvm *mvm,
 					      struct napi_struct *napi,
-					      u8 baid, u16 nssn, int queue)
+					      u8 baid, u16 nssn, int queue,
+					      u32 flags)
 {
 	struct ieee80211_sta *sta;
 	struct iwl_mvm_reorder_buffer *reorder_buf;
@@ -711,7 +730,7 @@ static void iwl_mvm_release_frames_from_notif(struct iwl_mvm *mvm,
 
 	spin_lock_bh(&reorder_buf->lock);
 	iwl_mvm_release_frames(mvm, sta, napi, ba_data,
-			       reorder_buf, nssn, false);
+			       reorder_buf, nssn, flags);
 	spin_unlock_bh(&reorder_buf->lock);
 
 out:
@@ -723,7 +742,8 @@ static void iwl_mvm_nssn_sync(struct iwl_mvm *mvm,
 			      const struct iwl_mvm_nssn_sync_data *data)
 {
 	iwl_mvm_release_frames_from_notif(mvm, napi, data->baid,
-					  data->nssn, queue);
+					  data->nssn, queue,
+					  IWL_MVM_RELEASE_FROM_RSS_SYNC);
 }
 
 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi,
@@ -851,7 +871,7 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 
 	if (ieee80211_is_back_req(hdr->frame_control)) {
 		iwl_mvm_release_frames(mvm, sta, napi, baid_data,
-				       buffer, nssn, false);
+				       buffer, nssn, 0);
 		goto drop;
 	}
 
@@ -871,7 +891,7 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 		u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 
 		iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer,
-				       min_sn, true);
+				       min_sn, IWL_MVM_RELEASE_SEND_RSS_SYNC);
 	}
 
 	/* drop any oudated packets */
@@ -963,7 +983,8 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 	 */
 	if (!amsdu || last_subframe)
 		iwl_mvm_release_frames(mvm, sta, napi, baid_data,
-				       buffer, nssn, true);
+				       buffer, nssn,
+				       IWL_MVM_RELEASE_SEND_RSS_SYNC);
 
 	spin_unlock_bh(&buffer->lock);
 	return true;
@@ -1936,5 +1957,6 @@ void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 	struct iwl_frame_release *release = (void *)pkt->data;
 
 	iwl_mvm_release_frames_from_notif(mvm, napi, release->baid,
-					  le16_to_cpu(release->nssn), queue);
+					  le16_to_cpu(release->nssn),
+					  queue, 0);
 }
-- 
2.20.1

[PATCH 14/16] iwlwifi: mvm: fix possible out-of-bounds read when accessing lq_info

[Luca Coelho]

From: Gregory Greenman <gregory.greenman@intel.com>

lq_info is an arary of size 2, active_tbl index is u8.
When accessing lq_info[1 - active_tbl], theoretically it's possible
that the access will be made to a negative index value.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c | 28 +++++++++++++++------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index 3fa50b1955bb..d3f04acfbacb 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -1352,6 +1352,18 @@ static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 	tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
 }
 
+/* rs uses two tables, one is active and the second is for searching better
+ * configuration. This function, according to the index of the currently
+ * active table returns the search table, which is located at the
+ * index complementary to 1 according to the active table (active = 1,
+ * search = 0 or active = 0, search = 1).
+ * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
+ */
+static inline u8 rs_search_tbl(u8 active_tbl)
+{
+	return (active_tbl ^ 1) & 1;
+}
+
 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
 			    struct iwl_lq_sta *lq_sta,
 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
@@ -1699,9 +1711,9 @@ static int rs_switch_to_column(struct iwl_mvm *mvm,
 			       struct ieee80211_sta *sta,
 			       enum rs_column col_id)
 {
-	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
+	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
 	struct iwl_scale_tbl_info *search_tbl =
-				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
+		&lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
 	struct rs_rate *rate = &search_tbl->rate;
 	const struct rs_tx_column *column = &rs_tx_columns[col_id];
 	const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
@@ -2109,7 +2121,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 	if (!lq_sta->search_better_tbl)
 		active_tbl = lq_sta->active_tbl;
 	else
-		active_tbl = 1 - lq_sta->active_tbl;
+		active_tbl = rs_search_tbl(lq_sta->active_tbl);
 
 	tbl = &(lq_sta->lq_info[active_tbl]);
 	rate = &tbl->rate;
@@ -2333,7 +2345,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 		/* If new "search" mode was selected, set up in uCode table */
 		if (lq_sta->search_better_tbl) {
 			/* Access the "search" table, clear its history. */
-			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
+			tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
 
 			/* Use new "search" start rate */
@@ -2676,7 +2688,7 @@ static void rs_initialize_lq(struct iwl_mvm *mvm,
 	if (!lq_sta->search_better_tbl)
 		active_tbl = lq_sta->active_tbl;
 	else
-		active_tbl = 1 - lq_sta->active_tbl;
+		active_tbl = rs_search_tbl(lq_sta->active_tbl);
 
 	tbl = &(lq_sta->lq_info[active_tbl]);
 	rate = &tbl->rate;
@@ -3172,9 +3184,9 @@ static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
 
 	if (!lq_sta->search_better_tbl) {
 		curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
-		other_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+		other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
 	} else {
-		curr_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+		curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
 		other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
 	}
 
@@ -3183,7 +3195,7 @@ static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
 			       "Neither active nor search matches tx rate\n");
 		tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
 		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
-		tmp_tbl = &lq_sta->lq_info[1 - lq_sta->active_tbl];
+		tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
 		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
 		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
 
-- 
2.20.1

[PATCH 15/16] iwlwifi: add 3 new IDs for the 9000 series (iwl9260_2ac_160_cfg)

[Luca Coelho]

From: Ihab Zhaika <ihab.zhaika@intel.com>

Add a few PCI ID'S for 9000 series.

Signed-off-by: Ihab Zhaika <ihab.zhaika@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/pcie/drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index ea2a03d4bf55..de711c1160d3 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -604,10 +604,13 @@ static const struct pci_device_id iwl_hw_card_ids[] = {
 	{IWL_PCI_DEVICE(0x2526, 0x40A4, iwl9460_2ac_cfg)},
 	{IWL_PCI_DEVICE(0x2526, 0x4234, iwl9560_2ac_cfg_soc)},
 	{IWL_PCI_DEVICE(0x2526, 0x42A4, iwl9462_2ac_cfg_soc)},
+	{IWL_PCI_DEVICE(0x2526, 0x6010, iwl9260_2ac_160_cfg)},
 	{IWL_PCI_DEVICE(0x2526, 0x6014, iwl9260_2ac_160_cfg)},
 	{IWL_PCI_DEVICE(0x2526, 0x8014, iwl9260_2ac_160_cfg)},
 	{IWL_PCI_DEVICE(0x2526, 0x8010, iwl9260_2ac_160_cfg)},
 	{IWL_PCI_DEVICE(0x2526, 0xA014, iwl9260_2ac_160_cfg)},
+	{IWL_PCI_DEVICE(0x2526, 0xE010, iwl9260_2ac_160_cfg)},
+	{IWL_PCI_DEVICE(0x2526, 0xE014, iwl9260_2ac_160_cfg)},
 	{IWL_PCI_DEVICE(0x271B, 0x0010, iwl9160_2ac_cfg)},
 	{IWL_PCI_DEVICE(0x271B, 0x0014, iwl9160_2ac_cfg)},
 	{IWL_PCI_DEVICE(0x271B, 0x0210, iwl9160_2ac_cfg)},
-- 
2.20.1

[PATCH 16/16] iwlwifi: mvm: fix version check for GEO_TX_POWER_LIMIT support

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

We erroneously added a check for FW API version 41 before sending
GEO_TX_POWER_LIMIT, but this was already implemented in version 38.
Additionally, it was cherry-picked to older versions, namely 17, 26
and 29, so check for those as well.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index a837cf40afde..00c89bcfdf6a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -886,9 +886,14 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
 	 * The GEO_TX_POWER_LIMIT command is not supported on earlier
 	 * firmware versions.  Unfortunately, we don't have a TLV API
 	 * flag to rely on, so rely on the major version which is in
-	 * the first byte of ucode_ver.
+	 * the first byte of ucode_ver.  This was implemented
+	 * initially on version 38 and then backported to 36, 29 and
+	 * 17.
 	 */
-	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 41;
+	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
+	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 36 ||
+	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
+	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
 }
 
 int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
-- 
2.20.1

Re: [PATCH 16/16] iwlwifi: mvm: fix version check for GEO_TX_POWER_LIMIT support

[Jonas Hahnfeld]

[-- Attachment #1: Type: text/plain, Size: 2111 bytes --]

Am Samstag, den 20.07.2019, 13:25 +0300 schrieb Luca Coelho:
> From: Luca Coelho <
> luciano.coelho@intel.com
> >
> 
> We erroneously added a check for FW API version 41 before sending
> GEO_TX_POWER_LIMIT, but this was already implemented in version 38.
> Additionally, it was cherry-picked to older versions, namely 17, 26
> and 29, so check for those as well.
> 
> Signed-off-by: Luca Coelho <
> luciano.coelho@intel.com
> >
> ---
>  drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> index a837cf40afde..00c89bcfdf6a 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> @@ -886,9 +886,14 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
>  	 * The GEO_TX_POWER_LIMIT command is not supported on earlier
>  	 * firmware versions.  Unfortunately, we don't have a TLV API
>  	 * flag to rely on, so rely on the major version which is in
> -	 * the first byte of ucode_ver.
> +	 * the first byte of ucode_ver.  This was implemented
> +	 * initially on version 38 and then backported to 36, 29 and
> +	 * 17.
>  	 */
> -	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 41;
> +	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 36 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
>  }
>  
>  int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)

After pulling iwlwifi-fixes-for-kvalo-2019-07-30, I still get firmware
crashes on my "Intel(R) Dual Band Wireless AC 8260" which uses firmware
version 36. I tried the latest ucode in linux-firmware (36.77d01142.0),
but it seems GEO_TX_POWER_LIMIT is not yet implemented there.

Could you let me know which firmware version I need for Linux 5.3? Can
there be a check in iwl_mvm_sar_geo_support() that the backported
support is indeed available?

Thanks,
Jonas

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH 01/16] iwlwifi: mvm: don't send GEO_TX_POWER_LIMIT on version < 41

[Luca Coelho]

On Sat, 2019-07-20 at 12:23 +0000, Sasha Levin wrote:
> Hi,
> 
> [This is an automated email]
> 
> This commit has been processed because it contains a -stable tag.
> The stable tag indicates that it's relevant for the following trees: all
> 
> The bot has tested the following trees: v5.2.1, v5.1.18, v4.19.59, v4.14.133, v4.9.185, v4.4.185.
> 
> v5.2.1: Build OK!
> v5.1.18: Build OK!
> v4.19.59: Build OK!
> v4.14.133: Build OK!
> v4.9.185: Failed to apply! Possible dependencies:
>     1f3706508395 ("iwlwifi: mvm: support unification of INIT and RT images")
>     42ce76d615e7 ("iwlwifi: mvm: spin off SAR profile selection function")
>     6996490501ed ("iwlwifi: mvm: add support for EWRD (Dynamic SAR) ACPI table")
>     7fe90e0e3d60 ("iwlwifi: mvm: refactor geo init")
>     a6bff3cb19b7 ("iwlwifi: mvm: add GEO_TX_POWER_LIMIT cmd for geographic tx power table")
>     c386dacb4ed6 ("iwlwifi: mvm: refactor SAR init to prepare for dynamic SAR")
> 
> v4.4.185: Failed to apply! Possible dependencies:
>     13555e8ba2f4 ("iwlwifi: mvm: add 9000-series RX API")
>     1a616dd2f171 ("iwlwifi: dump prph registers in a common place for all transports")
>     2f89a5d7d377 ("iwlwifi: mvm: move fw-dbg code to separate file")
>     321c2104f2f1 ("iwlwifi: mvm: Support setting continuous recording debug mode")
>     39bdb17ebb5b ("iwlwifi: update host command messages to new format")
>     42ce76d615e7 ("iwlwifi: mvm: spin off SAR profile selection function")
>     43413a975d06 ("iwlwifi: mvm: support rss queues configuration command")
>     4707fde5cdef ("iwlwifi: mvm: use build-time assertion for fw trigger ID")
>     6c4fbcbc1c95 ("iwlwifi: add support for 12K Receive Buffers")
>     854d773e4ab5 ("iwlwifi: mvm: improve RSS configuration")
>     92fe83430b89 ("iwlwifi: uninline iwl_trans_send_cmd")
>     9e7dce286595 ("iwlwifi: mvm: allow to limit the A-MSDU from debugfs")
>     da2830acf15a ("iwlwifi: mvm: read SAR BIOS table from ACPI")
>     dcbb4746286a ("iwlwifi: trans: support a callback for ASYNC commands")
>     dd4d3161d0f2 ("iwlwifi: mvm: fix RSS key sizing")
> 
> 
> NOTE: The patch will not be queued to stable trees until it is upstream.
> 
> How should we proceed with this patch?

Hi Sasha,

In this specific case, the patch does not have to be applied on 4.9 and
4.4.  What is the right way to handle these cases? Should I simply
ignore them, so they won't go into those kernels by default or do you
want me to follow up somehow and let you know that those kernels can be
ignore?

--
Cheers,
Luca.

Re: [PATCH 16/16] iwlwifi: mvm: fix version check for GEO_TX_POWER_LIMIT support

[Luca Coelho]

On Thu, 2019-08-01 at 16:07 +0200, Jonas Hahnfeld wrote:
> Am Samstag, den 20.07.2019, 13:25 +0300 schrieb Luca Coelho:
> > From: Luca Coelho <
> > luciano.coelho@intel.com
> > 
> > We erroneously added a check for FW API version 41 before sending
> > GEO_TX_POWER_LIMIT, but this was already implemented in version 38.
> > Additionally, it was cherry-picked to older versions, namely 17, 26
> > and 29, so check for those as well.
> > 
> > Signed-off-by: Luca Coelho <
> > luciano.coelho@intel.com
> > ---
> >  drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 9 +++++++--
> >  1 file changed, 7 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> > index a837cf40afde..00c89bcfdf6a 100644
> > --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> > +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> > @@ -886,9 +886,14 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
> >  	 * The GEO_TX_POWER_LIMIT command is not supported on earlier
> >  	 * firmware versions.  Unfortunately, we don't have a TLV API
> >  	 * flag to rely on, so rely on the major version which is in
> > -	 * the first byte of ucode_ver.
> > +	 * the first byte of ucode_ver.  This was implemented
> > +	 * initially on version 38 and then backported to 36, 29 and
> > +	 * 17.
> >  	 */
> > -	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 41;
> > +	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
> > +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 36 ||
> > +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
> > +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
> >  }
> >  
> >  int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
> 
> After pulling iwlwifi-fixes-for-kvalo-2019-07-30, I still get firmware
> crashes on my "Intel(R) Dual Band Wireless AC 8260" which uses firmware
> version 36. I tried the latest ucode in linux-firmware (36.77d01142.0),
> but it seems GEO_TX_POWER_LIMIT is not yet implemented there.
> 
> Could you let me know which firmware version I need for Linux 5.3? Can
> there be a check in iwl_mvm_sar_geo_support() that the backported
> support is indeed available?

We have some issues detecting whether the FW supports this command or
not.  There is already a bugzilla[1] for this (and a bunch of
duplicates), so let's track it there.

https://bugzilla.kernel.org/show_bug.cgi?id=204151


--
Cheers,
Luca.