iwlwifi: 802.11n add support to 8K A-MSDU Rx frames

This patch give the iwlwifi the ability to support A-MSDU up to 8K

Please notice - in order to work in 8K A-MSDU ucode support is needed,
version 4.44.1.19 (soon to be published). 4K A-MSDU works in current ucode
version as well.
Signed-off-by: NRon Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945-hw.h

@@ -646,9 +646,6 @@ struct iwl3945_eeprom {
 #define RX_FREE_BUFFERS 64
 #define RX_LOW_WATERMARK 8
 
-/* Size of one Rx buffer in host DRAM */
-#define IWL_RX_BUF_SIZE 3000
-
 /* Sizes and addresses for instruction and data memory (SRAM) in
  * 3945's embedded processor.  Driver access is via HBUS_TARG_MEM_* regs. */
 #define RTC_INST_LOWER_BOUND			(0x000000)

drivers/net/wireless/iwlwifi/iwl-3945.c

@@ -2229,7 +2229,8 @@ int iwl3945_hw_set_hw_setting(struct iwl3945_priv *priv)
 	}
 
 	priv->hw_setting.ac_queue_count = AC_NUM;
-	priv->hw_setting.rx_buffer_size = IWL_RX_BUF_SIZE;
+	priv->hw_setting.rx_buf_size = IWL_RX_BUF_SIZE;
+	priv->hw_setting.max_pkt_size = 2342;
 	priv->hw_setting.tx_cmd_len = sizeof(struct iwl3945_tx_cmd);
 	priv->hw_setting.max_rxq_size = RX_QUEUE_SIZE;
 	priv->hw_setting.max_rxq_log = RX_QUEUE_SIZE_LOG;

drivers/net/wireless/iwlwifi/iwl-3945.h

@@ -75,6 +75,7 @@ enum iwl3945_antenna {
  * else RTS for data/management frames where MPDU is larger
  *   than RTS value.
  */
+#define IWL_RX_BUF_SIZE           3000U
 #define DEFAULT_RTS_THRESHOLD     2347U
 #define MIN_RTS_THRESHOLD         0U
 #define MAX_RTS_THRESHOLD         2347U
@@ -452,6 +453,30 @@ union iwl3945_ht_rate_supp {
 	};
 };
 
+#ifdef CONFIG_IWL3945_HT
+#define CFG_HT_RX_AMPDU_FACTOR_DEF  (0x3)
+#define CFG_HT_MPDU_DENSITY_2USEC   (0x5)
+#define CFG_HT_MPDU_DENSITY_DEF CFG_HT_MPDU_DENSITY_2USEC
+
+struct sta_ht_info {
+	u8 is_ht;
+	u16 rx_mimo_ps_mode;
+	u16 tx_mimo_ps_mode;
+	u16 control_channel;
+	u8 max_amsdu_size;
+	u8 ampdu_factor;
+	u8 mpdu_density;
+	u8 operating_mode;
+	u8 supported_chan_width;
+	u8 extension_chan_offset;
+	u8 is_green_field;
+	u8 sgf;
+	u8 supp_rates[16];
+	u8 tx_chan_width;
+	u8 chan_width_cap;
+};
+#endif				/*CONFIG_IWL3945_HT */
+
 #ifdef CONFIG_IWL3945_QOS
 
 union iwl3945_qos_capabity {
@@ -535,7 +560,8 @@ struct iwl3945_ibss_seq {
  * @ac_queue_count: # Tx queues for EDCA Access Categories (AC)
  * @tx_cmd_len: Size of Tx command (but not including frame itself)
  * @max_rxq_size: Max # Rx frames in Rx queue (must be power-of-2)
- * @rx_buffer_size:
+ * @rx_buf_size:
+ * @max_pkt_size:
  * @max_rxq_log: Log-base-2 of max_rxq_size
  * @max_stations:
  * @bcast_sta_id:
@@ -547,7 +573,8 @@ struct iwl3945_driver_hw_info {
 	u16 ac_queue_count;
 	u16 tx_cmd_len;
 	u16 max_rxq_size;
-	u32 rx_buffer_size;
+	u32 rx_buf_size;
+	u32 max_pkt_size;
 	u16 max_rxq_log;
 	u8  max_stations;
 	u8  bcast_sta_id;

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

@@ -609,7 +609,8 @@ struct iwl4965_eeprom {
 #define RX_LOW_WATERMARK 8
 
 /* Size of one Rx buffer in host DRAM */
-#define IWL_RX_BUF_SIZE (4 * 1024)
+#define IWL_RX_BUF_SIZE_4K (4 * 1024)
+#define IWL_RX_BUF_SIZE_8K (8 * 1024)
 
 /* Sizes and addresses for instruction and data memory (SRAM) in
  * 4965's embedded processor.  Driver access is via HBUS_TARG_MEM_* regs. */
@@ -1457,13 +1458,17 @@ enum {
 #define FH_RCSR_CHNL0_RX_CONFIG_DMA_CHNL_EN_MASK  (0xC0000000) /* bits 30-31 */
 
 #define FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT	(20)
-#define FH_RCSR_RX_CONFIG_RB_SIZE_BITSHIFT	(16)
+#define FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_BITSHIFT	(4)
+#define RX_RB_TIMEOUT	(0x10)
 
 #define FH_RCSR_RX_CONFIG_CHNL_EN_PAUSE_VAL         (0x00000000)
 #define FH_RCSR_RX_CONFIG_CHNL_EN_PAUSE_EOF_VAL     (0x40000000)
 #define FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL        (0x80000000)
 
-#define IWL_FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K    (0x00000000)
+#define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K    (0x00000000)
+#define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K    (0x00010000)
+#define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_12K   (0x00020000)
+#define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_16K   (0x00030000)
 
 #define FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_NO_INT_VAL       (0x00000000)
 #define FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL     (0x00001000)

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

@@ -226,6 +226,7 @@ static int iwl4965_rx_init(struct iwl4965_priv *priv, struct iwl4965_rx_queue *r
 {
 	int rc;
 	unsigned long flags;
+	unsigned int rb_size;
 
 	spin_lock_irqsave(&priv->lock, flags);
 	rc = iwl4965_grab_nic_access(priv);
@@ -234,6 +235,11 @@ static int iwl4965_rx_init(struct iwl4965_priv *priv, struct iwl4965_rx_queue *r
 		return rc;
 	}
 
+	if (iwl4965_param_amsdu_size_8K)
+		rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
+	else
+		rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
+
 	/* Stop Rx DMA */
 	iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 
@@ -253,7 +259,7 @@ static int iwl4965_rx_init(struct iwl4965_priv *priv, struct iwl4965_rx_queue *r
 	iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 			     FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 			     FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
-			     IWL_FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K |
+			     rb_size |
 			     /*0x10 << 4 | */
 			     (RX_QUEUE_SIZE_LOG <<
 			      FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT));
@@ -1771,7 +1777,11 @@ int iwl4965_hw_set_hw_setting(struct iwl4965_priv *priv)
 	priv->hw_setting.tx_cmd_len = sizeof(struct iwl4965_tx_cmd);
 	priv->hw_setting.max_rxq_size = RX_QUEUE_SIZE;
 	priv->hw_setting.max_rxq_log = RX_QUEUE_SIZE_LOG;
-
+	if (iwl4965_param_amsdu_size_8K)
+		priv->hw_setting.rx_buf_size = IWL_RX_BUF_SIZE_8K;
+	else
+		priv->hw_setting.rx_buf_size = IWL_RX_BUF_SIZE_4K;
+	priv->hw_setting.max_pkt_size = priv->hw_setting.rx_buf_size - 256;
 	priv->hw_setting.max_stations = IWL4965_STATION_COUNT;
 	priv->hw_setting.bcast_sta_id = IWL4965_BROADCAST_ID;
 	return 0;
@@ -3619,7 +3629,7 @@ static void iwl4965_handle_data_packet(struct iwl4965_priv *priv, int is_data,
 		rx_start->byte_count = amsdu->byte_count;
 		rx_end = (__le32 *) (((u8 *) hdr) + len);
 	}
-	if (len > IWL_RX_BUF_SIZE || len < 16) {
+	if (len > priv->hw_setting.max_pkt_size || len < 16) {
 		IWL_WARNING("byte count out of range [16,4K]"
 			       " : %d\n", len);
 		return;
@@ -3785,6 +3795,10 @@ void iwl4965_init_ht_hw_capab(struct ieee80211_ht_info *ht_info, int mode)
 	ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_20;
 	ht_info->cap |= (u16)(IEEE80211_HT_CAP_MIMO_PS &
 			     (IWL_MIMO_PS_NONE << 2));
+	if (iwl4965_param_amsdu_size_8K) {
+		printk(KERN_DEBUG "iwl4965 in A-MSDU 8K support mode\n");
+		ht_info->cap |= (u16)IEEE80211_HT_CAP_MAX_AMSDU;
+	}
 
 	ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
 	ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;

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

@@ -60,6 +60,7 @@ extern struct pci_device_id iwl4965_hw_card_ids[];
 /* Module parameters accessible from iwl-*.c */
 extern int iwl4965_param_hwcrypto;
 extern int iwl4965_param_queues_num;
+extern int iwl4965_param_amsdu_size_8K;
 
 enum iwl4965_antenna {
 	IWL_ANTENNA_DIVERSITY,
@@ -506,7 +507,6 @@ union iwl4965_ht_rate_supp {
 
 #ifdef CONFIG_IWL4965_HT
 #define CFG_HT_RX_AMPDU_FACTOR_DEF  (0x3)
-#define HT_IE_MAX_AMSDU_SIZE_4K     (0)
 #define CFG_HT_MPDU_DENSITY_2USEC   (0x5)
 #define CFG_HT_MPDU_DENSITY_DEF CFG_HT_MPDU_DENSITY_2USEC
 
@@ -618,7 +618,8 @@ struct iwl4965_driver_hw_info {
 	u16 ac_queue_count;
 	u16 tx_cmd_len;
 	u16 max_rxq_size;
-	u32 rx_buffer_size;
+	u32 rx_buf_size;
+	u32 max_pkt_size;
 	u16 max_rxq_log;
 	u8  max_stations;
 	u8  bcast_sta_id;

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -70,6 +70,7 @@ static int iwl4965_param_antenna;  /* def: 0 = both antennas (use diversity) */
 int iwl4965_param_hwcrypto;        /* def: using software encryption */
 static int iwl4965_param_qos_enable = 1; /* def: 1 = use quality of service */
 int iwl4965_param_queues_num = IWL_MAX_NUM_QUEUES; /* def: 16 Tx queues */
+int iwl4965_param_amsdu_size_8K;   /* def: enable 8K amsdu size */
 
 /*
  * module name, copyright, version, etc.
@@ -3263,7 +3264,7 @@ void iwl4965_handle_data_packet_monitor(struct iwl4965_priv *priv,
 	__le16 phy_flags_hw = cpu_to_le16(phy_flags);
 
 	/* We received data from the HW, so stop the watchdog */
-	if (len > IWL_RX_BUF_SIZE - sizeof(*iwl4965_rt)) {
+	if (len > priv->hw_setting.rx_buf_size - sizeof(*iwl4965_rt)) {
 		IWL_DEBUG_DROP("Dropping too large packet in monitor\n");
 		return;
 	}
@@ -4506,7 +4507,8 @@ static void iwl4965_rx_allocate(struct iwl4965_priv *priv)
 
 		/* Alloc a new receive buffer */
 		rxb->skb =
-		    alloc_skb(IWL_RX_BUF_SIZE, __GFP_NOWARN | GFP_ATOMIC);
+		    alloc_skb(priv->hw_setting.rx_buf_size,
+				__GFP_NOWARN | GFP_ATOMIC);
 		if (!rxb->skb) {
 			if (net_ratelimit())
 				printk(KERN_CRIT DRV_NAME
@@ -4522,7 +4524,7 @@ static void iwl4965_rx_allocate(struct iwl4965_priv *priv)
 		/* Get physical address of RB/SKB */
 		rxb->dma_addr =
 		    pci_map_single(priv->pci_dev, rxb->skb->data,
-				   IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+			   priv->hw_setting.rx_buf_size, PCI_DMA_FROMDEVICE);
 		list_add_tail(&rxb->list, &rxq->rx_free);
 		rxq->free_count++;
 	}
@@ -4565,7 +4567,8 @@ static void iwl4965_rx_queue_free(struct iwl4965_priv *priv, struct iwl4965_rx_q
 		if (rxq->pool[i].skb != NULL) {
 			pci_unmap_single(priv->pci_dev,
 					 rxq->pool[i].dma_addr,
-					 IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+					 priv->hw_setting.rx_buf_size,
+					 PCI_DMA_FROMDEVICE);
 			dev_kfree_skb(rxq->pool[i].skb);
 		}
 	}
@@ -4616,7 +4619,8 @@ void iwl4965_rx_queue_reset(struct iwl4965_priv *priv, struct iwl4965_rx_queue *
 		if (rxq->pool[i].skb != NULL) {
 			pci_unmap_single(priv->pci_dev,
 					 rxq->pool[i].dma_addr,
-					 IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+					 priv->hw_setting.rx_buf_size,
+					 PCI_DMA_FROMDEVICE);
 			priv->alloc_rxb_skb--;
 			dev_kfree_skb(rxq->pool[i].skb);
 			rxq->pool[i].skb = NULL;
@@ -4750,7 +4754,7 @@ static void iwl4965_rx_handle(struct iwl4965_priv *priv)
 		rxq->queue[i] = NULL;
 
 		pci_dma_sync_single_for_cpu(priv->pci_dev, rxb->dma_addr,
-					    IWL_RX_BUF_SIZE,
+					    priv->hw_setting.rx_buf_size,
 					    PCI_DMA_FROMDEVICE);
 		pkt = (struct iwl4965_rx_packet *)rxb->skb->data;
 
@@ -4803,7 +4807,8 @@ static void iwl4965_rx_handle(struct iwl4965_priv *priv)
 		}
 
 		pci_unmap_single(priv->pci_dev, rxb->dma_addr,
-				 IWL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+				 priv->hw_setting.rx_buf_size,
+				 PCI_DMA_FROMDEVICE);
 		spin_lock_irqsave(&rxq->lock, flags);
 		list_add_tail(&rxb->list, &priv->rxq.rx_used);
 		spin_unlock_irqrestore(&rxq->lock, flags);
@@ -9523,6 +9528,8 @@ MODULE_PARM_DESC(queues_num, "number of hw queues.");
 /* QoS */
 module_param_named(qos_enable, iwl4965_param_qos_enable, int, 0444);
 MODULE_PARM_DESC(qos_enable, "enable all QoS functionality");
+module_param_named(amsdu_size_8K, iwl4965_param_amsdu_size_8K, int, 0444);
+MODULE_PARM_DESC(amsdu_size_8K, "enable 8K amsdu size");
 
 module_exit(iwl4965_exit);
 module_init(iwl4965_init);