netxen: add receive side scaling (rss) support

This patch enables the load balancing capability of firmware
and hardware to spray traffic into different cpus through
separate rx msix interrupts.

The feature is being enabled for NX3031, NX2031 (old) will be
enabled later. This depends on msi-x and compatibility with
msi and legacy is maintained by enabling single rx ring.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic.h

@@ -78,16 +78,17 @@
 
 #define PHAN_VENDOR_ID 0x4040
 
-#define RCV_DESC_RINGSIZE	\
-	(sizeof(struct rcv_desc) * adapter->num_rxd)
-#define STATUS_DESC_RINGSIZE	\
-	(sizeof(struct status_desc) * adapter->num_rxd)
-#define LRO_DESC_RINGSIZE	\
-	(sizeof(rcvDesc_t) * adapter->num_lro_rxd)
-#define TX_RINGSIZE	\
-	(sizeof(struct netxen_cmd_buffer) * adapter->num_txd)
-#define RCV_BUFFSIZE	\
+#define RCV_DESC_RINGSIZE(rds_ring)	\
+	(sizeof(struct rcv_desc) * (rds_ring)->num_desc)
+#define RCV_BUFF_RINGSIZE(rds_ring)	\
 	(sizeof(struct netxen_rx_buffer) * rds_ring->num_desc)
+#define STATUS_DESC_RINGSIZE(sds_ring)	\
+	(sizeof(struct status_desc) * (sds_ring)->num_desc)
+#define TX_BUFF_RINGSIZE(adapter)	\
+	(sizeof(struct netxen_cmd_buffer) * adapter->num_txd)
+#define TX_DESC_RINGSIZE(adapter)	\
+	(sizeof(struct cmd_desc_type0) * adapter->num_txd)
+
 #define find_diff_among(a,b,range) ((a)<(b)?((b)-(a)):((b)+(range)-(a)))
 
 #define NETXEN_RCV_PRODUCER_OFFSET	0
@@ -188,7 +189,8 @@
 /* Host writes the following to notify that it has done the init-handshake */
 #define PHAN_INITIALIZE_ACK	0xf00f
 
-#define NUM_RCV_DESC_RINGS	3	/* No of Rcv Descriptor contexts */
+#define NUM_RCV_DESC_RINGS	3
+#define NUM_STS_DESC_RINGS	4
 
 #define RCV_RING_NORMAL	0
 #define RCV_RING_JUMBO	1
@@ -722,7 +724,7 @@ extern char netxen_nic_driver_name[];
 #endif
 
 /* Number of status descriptors to handle per interrupt */
-#define MAX_STATUS_HANDLE	(128)
+#define MAX_STATUS_HANDLE	(64)
 
 /*
  * netxen_skb_frag{} is to contain mapping info for each SG list. This
@@ -827,17 +829,37 @@ struct netxen_adapter_stats {
  */
 struct nx_host_rds_ring {
 	u32 producer;
-	u32 crb_rcv_producer;	/* reg offset */
-	struct rcv_desc *desc_head;	/* address of rx ring in Phantom */
-	struct netxen_rx_buffer *rx_buf_arr;	/* rx buffers for receive   */
-	struct list_head free_list;
+	u32 crb_rcv_producer;
 	u32 num_desc;
 	u32 dma_size;
 	u32 skb_size;
 	u32 flags;
+	struct rcv_desc *desc_head;
+	struct netxen_rx_buffer *rx_buf_arr;
+	struct list_head free_list;
+	spinlock_t lock;
 	dma_addr_t phys_addr;
 };
 
+struct nx_host_sds_ring {
+	u32 consumer;
+	u32 crb_sts_consumer;
+	u32 crb_intr_mask;
+	u32 num_desc;
+
+	struct status_desc *desc_head;
+	struct netxen_adapter *adapter;
+	struct napi_struct napi;
+	struct list_head free_list[NUM_RCV_DESC_RINGS];
+
+	u16 clean_tx;
+	u16 post_rxd;
+	int irq;
+
+	dma_addr_t phys_addr;
+	char name[IFNAMSIZ+4];
+};
+
 /*
  * Receive context. There is one such structure per instance of the
  * receive processing. Any state information that is relevant to
@@ -850,10 +872,7 @@ struct netxen_recv_context {
 	u16 virt_port;
 
 	struct nx_host_rds_ring rds_rings[NUM_RCV_DESC_RINGS];
-	u32 status_rx_consumer;
-	u32 crb_sts_consumer;	/* reg offset */
-	dma_addr_t rcv_status_desc_phys_addr;
-	struct status_desc *rcv_status_desc_head;
+	struct nx_host_sds_ring sds_rings[NUM_STS_DESC_RINGS];
 };
 
 /* New HW context creation */
@@ -1179,13 +1198,13 @@ typedef struct {
 #define NETXEN_IS_MSI_FAMILY(adapter) \
 	((adapter)->flags & (NETXEN_NIC_MSI_ENABLED | NETXEN_NIC_MSIX_ENABLED))
 
-#define MSIX_ENTRIES_PER_ADAPTER	1
+#define MSIX_ENTRIES_PER_ADAPTER	NUM_STS_DESC_RINGS
 #define NETXEN_MSIX_TBL_SPACE		8192
 #define NETXEN_PCI_REG_MSIX_TBL		0x44
 
 #define NETXEN_DB_MAPSIZE_BYTES    	0x1000
 
-#define NETXEN_NETDEV_WEIGHT 120
+#define NETXEN_NETDEV_WEIGHT 128
 #define NETXEN_ADAPTER_UP_MAGIC 777
 #define NETXEN_NIC_PEG_TUNE 0
 
@@ -1200,7 +1219,6 @@ struct netxen_adapter {
 	struct net_device *netdev;
 	struct pci_dev *pdev;
 	int pci_using_dac;
-	struct napi_struct napi;
 	struct net_device_stats net_stats;
 	int mtu;
 	int portnum;
@@ -1212,7 +1230,6 @@ struct netxen_adapter {
 	nx_mac_list_t	*mac_list;
 
 	struct netxen_legacy_intr_set legacy_intr;
-	u32	crb_intr_mask;
 
 	struct work_struct watchdog_task;
 	struct timer_list watchdog_timer;
@@ -1227,13 +1244,15 @@ struct netxen_adapter {
 	u32 last_cmd_consumer;
 	u32 crb_addr_cmd_producer;
 	u32 crb_addr_cmd_consumer;
+	spinlock_t tx_clean_lock;
 
 	u32 num_txd;
 	u32 num_rxd;
 	u32 num_jumbo_rxd;
 	u32 num_lro_rxd;
 
 	int max_rds_rings;
+	int max_sds_rings;
 
 	u32 flags;
 	u32 irq;
@@ -1243,8 +1262,7 @@ struct netxen_adapter {
 	u32 fw_major;
 	u32 fw_version;
 
-	u8 msix_supported;
-	u8 max_possible_rss_rings;
+	int msix_supported;
 	struct msix_entry msix_entries[MSIX_ENTRIES_PER_ADAPTER];
 
 	struct netxen_adapter_stats stats;
@@ -1447,14 +1465,16 @@ void netxen_initialize_adapter_ops(struct netxen_adapter *adapter);
 int netxen_init_firmware(struct netxen_adapter *adapter);
 void netxen_nic_clear_stats(struct netxen_adapter *adapter);
 void netxen_watchdog_task(struct work_struct *work);
-void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ringid);
+void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ringid,
+		struct nx_host_rds_ring *rds_ring);
 int netxen_process_cmd_ring(struct netxen_adapter *adapter);
-int netxen_process_rcv_ring(struct netxen_adapter *adapter, int max);
+int netxen_process_rcv_ring(struct nx_host_sds_ring *sds_ring, int max);
 void netxen_p2_nic_set_multi(struct net_device *netdev);
 void netxen_p3_nic_set_multi(struct net_device *netdev);
 void netxen_p3_free_mac_list(struct netxen_adapter *adapter);
 int netxen_p3_nic_set_promisc(struct netxen_adapter *adapter, u32);
 int netxen_config_intr_coalesce(struct netxen_adapter *adapter);
+int netxen_config_rss(struct netxen_adapter *adapter, int enable);
 
 int nx_fw_cmd_set_mtu(struct netxen_adapter *adapter, int mtu);
 int netxen_nic_change_mtu(struct net_device *netdev, int new_mtu);