igc: Add interrupt support

This patch set adds interrupt support for the igc interfaces.
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/igc.h

@@ -28,6 +28,17 @@
 extern char igc_driver_name[];
 extern char igc_driver_version[];
 
+/* Interrupt defines */
+#define IGC_START_ITR			648 /* ~6000 ints/sec */
+#define IGC_FLAG_HAS_MSI		BIT(0)
+#define IGC_FLAG_QUEUE_PAIRS		BIT(4)
+#define IGC_FLAG_HAS_MSIX		BIT(13)
+
+#define IGC_START_ITR			648 /* ~6000 ints/sec */
+#define IGC_4K_ITR			980
+#define IGC_20K_ITR			196
+#define IGC_70K_ITR			56
+
 /* Transmit and receive queues */
 #define IGC_MAX_RX_QUEUES		4
 #define IGC_MAX_TX_QUEUES		4
@@ -42,10 +53,96 @@ enum igc_state_t {
 	__IGC_PTP_TX_IN_PROGRESS,
 };
 
+struct igc_tx_queue_stats {
+	u64 packets;
+	u64 bytes;
+	u64 restart_queue;
+};
+
+struct igc_rx_queue_stats {
+	u64 packets;
+	u64 bytes;
+	u64 drops;
+	u64 csum_err;
+	u64 alloc_failed;
+};
+
+struct igc_rx_packet_stats {
+	u64 ipv4_packets;      /* IPv4 headers processed */
+	u64 ipv4e_packets;     /* IPv4E headers with extensions processed */
+	u64 ipv6_packets;      /* IPv6 headers processed */
+	u64 ipv6e_packets;     /* IPv6E headers with extensions processed */
+	u64 tcp_packets;       /* TCP headers processed */
+	u64 udp_packets;       /* UDP headers processed */
+	u64 sctp_packets;      /* SCTP headers processed */
+	u64 nfs_packets;       /* NFS headers processe */
+	u64 other_packets;
+};
+
+struct igc_ring_container {
+	struct igc_ring *ring;          /* pointer to linked list of rings */
+	unsigned int total_bytes;       /* total bytes processed this int */
+	unsigned int total_packets;     /* total packets processed this int */
+	u16 work_limit;                 /* total work allowed per interrupt */
+	u8 count;                       /* total number of rings in vector */
+	u8 itr;                         /* current ITR setting for ring */
+};
+
+struct igc_ring {
+	struct igc_q_vector *q_vector;  /* backlink to q_vector */
+	struct net_device *netdev;      /* back pointer to net_device */
+	struct device *dev;             /* device for dma mapping */
+	union {                         /* array of buffer info structs */
+		struct igc_tx_buffer *tx_buffer_info;
+		struct igc_rx_buffer *rx_buffer_info;
+	};
+	void *desc;                     /* descriptor ring memory */
+	unsigned long flags;            /* ring specific flags */
+	void __iomem *tail;             /* pointer to ring tail register */
+	dma_addr_t dma;                 /* phys address of the ring */
+	unsigned int size;              /* length of desc. ring in bytes */
+
+	u16 count;                      /* number of desc. in the ring */
+	u8 queue_index;                 /* logical index of the ring*/
+	u8 reg_idx;                     /* physical index of the ring */
+
+	/* everything past this point are written often */
+	u16 next_to_clean;
+	u16 next_to_use;
+	u16 next_to_alloc;
+
+	union {
+		/* TX */
+		struct {
+			struct igc_tx_queue_stats tx_stats;
+		};
+		/* RX */
+		struct {
+			struct igc_rx_queue_stats rx_stats;
+			struct igc_rx_packet_stats pkt_stats;
+			struct sk_buff *skb;
+		};
+	};
+} ____cacheline_internodealigned_in_smp;
+
 struct igc_q_vector {
 	struct igc_adapter *adapter;    /* backlink */
+	void __iomem *itr_register;
+	u32 eims_value;                 /* EIMS mask value */
+
+	u16 itr_val;
+	u8 set_itr;
+
+	struct igc_ring_container rx, tx;
 
 	struct napi_struct napi;
+
+	struct rcu_head rcu;    /* to avoid race with update stats on free */
+	char name[IFNAMSIZ + 9];
+	struct net_device poll_dev;
+
+	/* for dynamic allocation of rings associated with this q_vector */
+	struct igc_ring ring[0] ____cacheline_internodealigned_in_smp;
 };
 
 struct igc_mac_addr {
@@ -65,13 +162,35 @@ struct igc_adapter {
 	unsigned long state;
 	unsigned int flags;
 	unsigned int num_q_vectors;
+
+	struct msix_entry *msix_entries;
+
+	/* TX */
+	u16 tx_work_limit;
+	int num_tx_queues;
+	struct igc_ring *tx_ring[IGC_MAX_TX_QUEUES];
+
+	/* RX */
+	int num_rx_queues;
+	struct igc_ring *rx_ring[IGC_MAX_RX_QUEUES];
+
+	struct timer_list watchdog_timer;
+	struct timer_list dma_err_timer;
+	struct timer_list phy_info_timer;
+
 	u16 link_speed;
 	u16 link_duplex;
 
 	u8 port_num;
 
 	u8 __iomem *io_addr;
+	/* Interrupt Throttle Rate */
+	u32 rx_itr_setting;
+	u32 tx_itr_setting;
+
+	struct work_struct reset_task;
 	struct work_struct watchdog_task;
+	struct work_struct dma_err_task;
 
 	int msg_enable;
 	u32 max_frame_size;
@@ -81,8 +200,16 @@ struct igc_adapter {
 
 	/* structs defined in igc_hw.h */
 	struct igc_hw hw;
+	struct igc_hw_stats stats;
 
 	struct igc_q_vector *q_vector[MAX_Q_VECTORS];
+	u32 eims_enable_mask;
+	u32 eims_other;
+
+	u16 tx_ring_count;
+	u16 rx_ring_count;
+
+	u32 rss_queues;
 
 	struct igc_mac_addr *mac_table;
 };

drivers/net/ethernet/intel/igc/igc_defines.h

@@ -42,4 +42,44 @@
 #define IGC_STATUS_SPEED_100	0x00000040      /* Speed 100Mb/s */
 #define IGC_STATUS_SPEED_1000	0x00000080      /* Speed 1000Mb/s */
 
+/* Interrupt Cause Read */
+#define IGC_ICR_TXDW		BIT(0)	/* Transmit desc written back */
+#define IGC_ICR_TXQE		BIT(1)	/* Transmit Queue empty */
+#define IGC_ICR_LSC		BIT(2)	/* Link Status Change */
+#define IGC_ICR_RXSEQ		BIT(3)	/* Rx sequence error */
+#define IGC_ICR_RXDMT0		BIT(4)	/* Rx desc min. threshold (0) */
+#define IGC_ICR_RXO		BIT(6)	/* Rx overrun */
+#define IGC_ICR_RXT0		BIT(7)	/* Rx timer intr (ring 0) */
+#define IGC_ICR_DRSTA		BIT(30)	/* Device Reset Asserted */
+#define IGC_ICS_RXT0		IGC_ICR_RXT0 /* Rx timer intr */
+
+#define IMS_ENABLE_MASK ( \
+	IGC_IMS_RXT0   |    \
+	IGC_IMS_TXDW   |    \
+	IGC_IMS_RXDMT0 |    \
+	IGC_IMS_RXSEQ  |    \
+	IGC_IMS_LSC)
+
+/* Interrupt Mask Set */
+#define IGC_IMS_TXDW		IGC_ICR_TXDW	/* Tx desc written back */
+#define IGC_IMS_RXSEQ		IGC_ICR_RXSEQ	/* Rx sequence error */
+#define IGC_IMS_LSC		IGC_ICR_LSC	/* Link Status Change */
+#define IGC_IMS_DOUTSYNC	IGC_ICR_DOUTSYNC /* NIC DMA out of sync */
+#define IGC_IMS_DRSTA		IGC_ICR_DRSTA	/* Device Reset Asserted */
+#define IGC_IMS_RXT0		IGC_ICR_RXT0	/* Rx timer intr */
+#define IGC_IMS_RXDMT0		IGC_ICR_RXDMT0	/* Rx desc min. threshold */
+
+#define IGC_QVECTOR_MASK	0x7FFC		/* Q-vector mask */
+#define IGC_ITR_VAL_MASK	0x04		/* ITR value mask */
+
+#define IGC_ICR_DOUTSYNC	0x10000000 /* NIC DMA out of sync */
+#define IGC_EITR_CNT_IGNR	0x80000000 /* Don't reset counters on write */
+#define IGC_IVAR_VALID		0x80
+#define IGC_GPIE_NSICR		0x00000001
+#define IGC_GPIE_MSIX_MODE	0x00000010
+#define IGC_GPIE_EIAME		0x40000000
+#define IGC_GPIE_PBA		0x80000000
+
+#define IGC_N0_QUEUE -1
+
 #endif /* _IGC_DEFINES_H_ */

drivers/net/ethernet/intel/igc/igc_hw.h

@@ -85,6 +85,90 @@ struct igc_hw {
 	u8 revision_id;
 };
 
+/* Statistics counters collected by the MAC */
+struct igc_hw_stats {
+	u64 crcerrs;
+	u64 algnerrc;
+	u64 symerrs;
+	u64 rxerrc;
+	u64 mpc;
+	u64 scc;
+	u64 ecol;
+	u64 mcc;
+	u64 latecol;
+	u64 colc;
+	u64 dc;
+	u64 tncrs;
+	u64 sec;
+	u64 cexterr;
+	u64 rlec;
+	u64 xonrxc;
+	u64 xontxc;
+	u64 xoffrxc;
+	u64 xofftxc;
+	u64 fcruc;
+	u64 prc64;
+	u64 prc127;
+	u64 prc255;
+	u64 prc511;
+	u64 prc1023;
+	u64 prc1522;
+	u64 gprc;
+	u64 bprc;
+	u64 mprc;
+	u64 gptc;
+	u64 gorc;
+	u64 gotc;
+	u64 rnbc;
+	u64 ruc;
+	u64 rfc;
+	u64 roc;
+	u64 rjc;
+	u64 mgprc;
+	u64 mgpdc;
+	u64 mgptc;
+	u64 tor;
+	u64 tot;
+	u64 tpr;
+	u64 tpt;
+	u64 ptc64;
+	u64 ptc127;
+	u64 ptc255;
+	u64 ptc511;
+	u64 ptc1023;
+	u64 ptc1522;
+	u64 mptc;
+	u64 bptc;
+	u64 tsctc;
+	u64 tsctfc;
+	u64 iac;
+	u64 icrxptc;
+	u64 icrxatc;
+	u64 ictxptc;
+	u64 ictxatc;
+	u64 ictxqec;
+	u64 ictxqmtc;
+	u64 icrxdmtc;
+	u64 icrxoc;
+	u64 cbtmpc;
+	u64 htdpmc;
+	u64 cbrdpc;
+	u64 cbrmpc;
+	u64 rpthc;
+	u64 hgptc;
+	u64 htcbdpc;
+	u64 hgorc;
+	u64 hgotc;
+	u64 lenerrs;
+	u64 scvpc;
+	u64 hrmpc;
+	u64 doosync;
+	u64 o2bgptc;
+	u64 o2bspc;
+	u64 b2ospc;
+	u64 b2ogprc;
+};
+
 s32  igc_read_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value);
 s32  igc_write_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value);
 void igc_read_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value);