iwlwifi: move rx queue read pointer into rxq

This patch moves rx status/read registers into
iwl_rx_queue structures. This solution is more memory
hungry but is more structured and provides needed RX/TX
separation

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965-hw.h

@@ -927,33 +927,6 @@ struct iwl4965_schedq_bc_tbl {
  */
 struct iwl4965_shared {
 	struct iwl4965_schedq_bc_tbl queues_bc_tbls[IWL49_NUM_QUEUES];
-	__le32 rb_closed;
-
-	/* __le32 rb_closed_stts_rb_num:12; */
-#define IWL_rb_closed_stts_rb_num_POS 0
-#define IWL_rb_closed_stts_rb_num_LEN 12
-#define IWL_rb_closed_stts_rb_num_SYM rb_closed
-	/* __le32 rsrv1:4; */
-	/* __le32 rb_closed_stts_rx_frame_num:12; */
-#define IWL_rb_closed_stts_rx_frame_num_POS 16
-#define IWL_rb_closed_stts_rx_frame_num_LEN 12
-#define IWL_rb_closed_stts_rx_frame_num_SYM rb_closed
-	/* __le32 rsrv2:4; */
-
-	__le32 frm_finished;
-	/* __le32 frame_finished_stts_rb_num:12; */
-#define IWL_frame_finished_stts_rb_num_POS 0
-#define IWL_frame_finished_stts_rb_num_LEN 12
-#define IWL_frame_finished_stts_rb_num_SYM frm_finished
-	/* __le32 rsrv3:4; */
-	/* __le32 frame_finished_stts_rx_frame_num:12; */
-#define IWL_frame_finished_stts_rx_frame_num_POS 16
-#define IWL_frame_finished_stts_rx_frame_num_LEN 12
-#define IWL_frame_finished_stts_rx_frame_num_SYM frm_finished
-	/* __le32 rsrv4:4; */
-
-	__le32 padding1;  /* so that allocation will be aligned to 16B */
-	__le32 padding2;
 } __attribute__ ((packed));
 
 #endif /* __iwl4965_4965_hw_h__ */

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -1631,12 +1631,6 @@ static int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
 }
 #endif
 
-static int iwl4965_shared_mem_rx_idx(struct iwl_priv *priv)
-{
-	struct iwl4965_shared *s = priv->shared_virt;
-	return le32_to_cpu(s->rb_closed) & 0xFFF;
-}
-
 static int iwl4965_alloc_shared_mem(struct iwl_priv *priv)
 {
 	priv->shared_virt = pci_alloc_consistent(priv->pci_dev,
@@ -1647,8 +1641,6 @@ static int iwl4965_alloc_shared_mem(struct iwl_priv *priv)
 
 	memset(priv->shared_virt, 0, sizeof(struct iwl4965_shared));
 
-	priv->rb_closed_offset = offsetof(struct iwl4965_shared, rb_closed);
-
 	return 0;
 }
 
@@ -2306,7 +2298,6 @@ static struct iwl_lib_ops iwl4965_lib = {
 	.set_hw_params = iwl4965_hw_set_hw_params,
 	.alloc_shared_mem = iwl4965_alloc_shared_mem,
 	.free_shared_mem = iwl4965_free_shared_mem,
-	.shared_mem_rx_idx = iwl4965_shared_mem_rx_idx,
 	.txq_update_byte_cnt_tbl = iwl4965_txq_update_byte_cnt_tbl,
 	.txq_set_sched = iwl4965_txq_set_sched,
 	.txq_agg_enable = iwl4965_txq_agg_enable,

drivers/net/wireless/iwlwifi/iwl-5000-hw.h

@@ -96,38 +96,9 @@ struct iwl5000_schedq_bc_tbl {
 
 /**
  * struct iwl5000_shared
- * @rb_closed
- * 	address is provided to FH_RSCSR_CHNL0_STTS_WPTR_REG
  */
 struct iwl5000_shared {
 	struct iwl5000_schedq_bc_tbl queues_bc_tbls[IWL50_NUM_QUEUES];
-	__le32 rb_closed;
-
-	/* __le32 rb_closed_stts_rb_num:12; */
-#define IWL_rb_closed_stts_rb_num_POS 0
-#define IWL_rb_closed_stts_rb_num_LEN 12
-#define IWL_rb_closed_stts_rb_num_SYM rb_closed
-	/* __le32 rsrv1:4; */
-	/* __le32 rb_closed_stts_rx_frame_num:12; */
-#define IWL_rb_closed_stts_rx_frame_num_POS 16
-#define IWL_rb_closed_stts_rx_frame_num_LEN 12
-#define IWL_rb_closed_stts_rx_frame_num_SYM rb_closed
-	/* __le32 rsrv2:4; */
-
-	__le32 frm_finished;
-	/* __le32 frame_finished_stts_rb_num:12; */
-#define IWL_frame_finished_stts_rb_num_POS 0
-#define IWL_frame_finished_stts_rb_num_LEN 12
-#define IWL_frame_finished_stts_rb_num_SYM frm_finished
-	/* __le32 rsrv3:4; */
-	/* __le32 frame_finished_stts_rx_frame_num:12; */
-#define IWL_frame_finished_stts_rx_frame_num_POS 16
-#define IWL_frame_finished_stts_rx_frame_num_LEN 12
-#define IWL_frame_finished_stts_rx_frame_num_SYM frm_finished
-	/* __le32 rsrv4:4; */
-
-	__le32 padding1;  /* so that allocation will be aligned to 16B */
-	__le32 padding2;
 } __attribute__ ((packed));
 
 #endif /* __iwl_5000_hw_h__ */

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -863,8 +863,6 @@ static int iwl5000_alloc_shared_mem(struct iwl_priv *priv)
 
 	memset(priv->shared_virt, 0, sizeof(struct iwl5000_shared));
 
-	priv->rb_closed_offset = offsetof(struct iwl5000_shared, rb_closed);
-
 	return 0;
 }
 
@@ -877,12 +875,6 @@ static void iwl5000_free_shared_mem(struct iwl_priv *priv)
 				    priv->shared_phys);
 }
 
-static int iwl5000_shared_mem_rx_idx(struct iwl_priv *priv)
-{
-	struct iwl5000_shared *s = priv->shared_virt;
-	return le32_to_cpu(s->rb_closed) & 0xFFF;
-}
-
 /**
  * iwl5000_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
  */
@@ -1460,7 +1452,6 @@ static struct iwl_lib_ops iwl5000_lib = {
 	.set_hw_params = iwl5000_hw_set_hw_params,
 	.alloc_shared_mem = iwl5000_alloc_shared_mem,
 	.free_shared_mem = iwl5000_free_shared_mem,
-	.shared_mem_rx_idx = iwl5000_shared_mem_rx_idx,
 	.txq_update_byte_cnt_tbl = iwl5000_txq_update_byte_cnt_tbl,
 	.txq_inval_byte_cnt_tbl = iwl5000_txq_inval_byte_cnt_tbl,
 	.txq_set_sched = iwl5000_txq_set_sched,

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -1359,7 +1359,7 @@ void iwl_rx_handle(struct iwl_priv *priv)
 
 	/* uCode's read index (stored in shared DRAM) indicates the last Rx
 	 * buffer that the driver may process (last buffer filled by ucode). */
-	r = priv->cfg->ops->lib->shared_mem_rx_idx(priv);
+	r = le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF;
 	i = rxq->read;
 
 	/* Rx interrupt, but nothing sent from uCode */

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -105,7 +105,6 @@ struct iwl_lib_ops {
 	/* ucode shared memory */
 	int (*alloc_shared_mem)(struct iwl_priv *priv);
 	void (*free_shared_mem)(struct iwl_priv *priv);
-	int (*shared_mem_rx_idx)(struct iwl_priv *priv);
 	/* Handling TX */
 	void (*txq_update_byte_cnt_tbl)(struct iwl_priv *priv,
 					struct iwl_tx_queue *txq,

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -301,7 +301,6 @@ struct iwl_host_cmd {
 
 /**
  * struct iwl_rx_queue - Rx queue
- * @processed: Internal index to last handled Rx packet
  * @read: Shared index to newest available Rx buffer
  * @write: Shared index to oldest written Rx packet
  * @free_count: Number of pre-allocated buffers in rx_free
@@ -316,13 +315,14 @@ struct iwl_rx_queue {
 	dma_addr_t dma_addr;
 	struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS];
 	struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE];
-	u32 processed;
 	u32 read;
 	u32 write;
 	u32 free_count;
 	struct list_head rx_free;
 	struct list_head rx_used;
 	int need_update;
+	struct iwl_rb_status *rb_stts;
+	dma_addr_t rb_stts_dma;
 	spinlock_t lock;
 };
 
@@ -967,10 +967,9 @@ struct iwl_priv {
 	struct ieee80211_vif *vif;
 
 	struct iwl_hw_params hw_params;
-	/* driver/uCode shared Tx Byte Counts and Rx status */
+	/* driver/uCode shared Tx Byte Counts */
 	void *shared_virt;
-	int rb_closed_offset;
-	/* Physical Pointer to Tx Byte Counts and Rx status */
+	/* Physical Pointer to Tx Byte Counts */
 	dma_addr_t shared_phys;
 
 	/* Current association information needed to configure the

drivers/net/wireless/iwlwifi/iwl-fh.h

@@ -403,5 +403,21 @@
 #define TFD_QUEUE_SIZE_BC_DUP	(64)
 #define TFD_QUEUE_BC_SIZE	(TFD_QUEUE_SIZE_MAX + TFD_QUEUE_SIZE_BC_DUP)
 
+/**
+ * struct iwl_rb_status - reseve buffer status
+ * 	host memory mapped FH registers
+ * @closed_rb_num [0:11] - Indicates the index of the RB which was closed
+ * @closed_fr_num [0:11] - Indicates the index of the RX Frame which was closed
+ * @finished_rb_num [0:11] - Indicates the index of the current RB
+ * 	in which the last frame was written to
+ * @finished_fr_num [0:11] - Indicates the index of the RX Frame
+ * 	which was transfered
+ */
+struct iwl_rb_status {
+	__le16 closed_rb_num;
+	__le16 closed_fr_num;
+	__le16 finished_rb_num;
+	__le16 finished_fr_nam;
+} __attribute__ ((packed));
 
 #endif /* !__iwl_fh_h__ */

drivers/net/wireless/iwlwifi/iwl-rx.c

@@ -317,7 +317,10 @@ void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 
 	pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 			    rxq->dma_addr);
+	pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
+			    rxq->rb_stts, rxq->rb_stts_dma);
 	rxq->bd = NULL;
+	rxq->rb_stts  = NULL;
 }
 EXPORT_SYMBOL(iwl_rx_queue_free);
 
@@ -334,7 +337,12 @@ int iwl_rx_queue_alloc(struct iwl_priv *priv)
 	/* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 	rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
 	if (!rxq->bd)
-		return -ENOMEM;
+		goto err_bd;
+
+	rxq->rb_stts = pci_alloc_consistent(dev, sizeof(struct iwl_rb_status),
+					&rxq->rb_stts_dma);
+	if (!rxq->rb_stts)
+		goto err_rb;
 
 	/* Fill the rx_used queue with _all_ of the Rx buffers */
 	for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
@@ -346,6 +354,12 @@ int iwl_rx_queue_alloc(struct iwl_priv *priv)
 	rxq->free_count = 0;
 	rxq->need_update = 0;
 	return 0;
+
+err_rb:
+	pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
+			    rxq->dma_addr);
+err_bd:
+	return -ENOMEM;
 }
 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 
@@ -412,7 +426,7 @@ int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 
 	/* Tell device where in DRAM to update its Rx status */
 	iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
-			   (priv->shared_phys + priv->rb_closed_offset) >> 4);
+			   rxq->rb_stts_dma >> 4);
 
 	/* Enable Rx DMA
 	 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in