iwlwifi: mvm: prepare for scheduler config command

The scheduler is a HW sub-block that directs the work of the Flow
Handler by issuing requests for frame transfers, specifying source
and destination. Its primary function is to allocate flows into the
TX FIFOs based upon a pre-determined mapping.

The driver has some responsibilities to the scheduler, namely
initialising and maintaining the hardware registers. This is
currently done by directly accessing them, which can cause races
with the firmware also accessing the registers.

To address this problem, change the driver to no longer directly
access the registers but go through the firmware for this if the
firmware has support for DQA and thus the new command.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/fw-api.h b/drivers/net/wireless/iwlwifi/mvm/fw-api.h
index a2c662808a88..667a92274c87 100644
--- a/drivers/net/wireless/iwlwifi/mvm/fw-api.h
+++ b/drivers/net/wireless/iwlwifi/mvm/fw-api.h
@@ -116,6 +116,9 @@ enum {
 	TXPATH_FLUSH = 0x1e,
 	MGMT_MCAST_KEY = 0x1f,
 
+	/* scheduler config */
+	SCD_QUEUE_CFG = 0x1d,
+
 	/* global key */
 	WEP_KEY = 0x20,
 
@@ -1650,4 +1653,61 @@ struct iwl_dts_measurement_notif {
 	__le32 voltage;
 } __packed; /* TEMPERATURE_MEASUREMENT_TRIGGER_NTFY_S */
 
+/**
+ * enum iwl_scd_control - scheduler config command control flags
+ * @IWL_SCD_CONTROL_RM_TID: remove TID from this queue
+ * @IWL_SCD_CONTROL_SET_SSN: use the SSN and program it into HW
+ */
+enum iwl_scd_control {
+	IWL_SCD_CONTROL_RM_TID	= BIT(4),
+	IWL_SCD_CONTROL_SET_SSN	= BIT(5),
+};
+
+/**
+ * enum iwl_scd_flags - scheduler config command flags
+ * @IWL_SCD_FLAGS_SHARE_TID: multiple TIDs map to this queue
+ * @IWL_SCD_FLAGS_SHARE_RA: multiple RAs map to this queue
+ * @IWL_SCD_FLAGS_DQA_ENABLED: DQA is enabled
+ */
+enum iwl_scd_flags {
+	IWL_SCD_FLAGS_SHARE_TID		= BIT(0),
+	IWL_SCD_FLAGS_SHARE_RA		= BIT(1),
+	IWL_SCD_FLAGS_DQA_ENABLED	= BIT(2),
+};
+
+#define IWL_SCDQ_INVALID_STA	0xff
+
+/**
+ * struct iwl_scd_txq_cfg_cmd - New txq hw scheduler config command
+ * @token:	dialog token addba - unused legacy
+ * @sta_id:	station id 4-bit
+ * @tid:	TID 0..7
+ * @scd_queue:	TFD queue num 0 .. 31
+ * @enable:	1 queue enable, 0 queue disable
+ * @aggregate:	1 aggregated queue, 0 otherwise
+ * @tx_fifo:	tx fifo num 0..7
+ * @window:	up to 64
+ * @ssn:	starting seq num 12-bit
+ * @control:	command control flags
+ * @flags:	flags - see &enum iwl_scd_flags
+ *
+ * Note that every time the command is sent, all parameters must
+ * be filled with the exception of
+ *  - the SSN, which is only used with @IWL_SCD_CONTROL_SET_SSN
+ *  - the window, which is only relevant when starting aggregation
+ */
+struct iwl_scd_txq_cfg_cmd {
+	u8 token;
+	u8 sta_id;
+	u8 tid;
+	u8 scd_queue;
+	u8 enable;
+	u8 aggregate;
+	u8 tx_fifo;
+	u8 window;
+	__le16 ssn;
+	u8 control;
+	u8 flags;
+} __packed;
+
 #endif /* __fw_api_h__ */