qede: Add basic network device support

This patch includes the basic Rx/Tx support for the driver [although
carrier will still never be turned on].
Following this patch the driver registers a network device, initializes
it and prepares it for traffic.
Signed-off-by: NSudarsana Kalluru <Sudarsana.Kalluru@qlogic.com>
Signed-off-by: NYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: NAriel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qede/qede.h

@@ -51,6 +51,7 @@ struct qede_dev {
 #define QEDE_MAX_TSS_CNT(edev)	((edev)->dev_info.num_queues * \
 				 (edev)->dev_info.num_tc)
 
+	struct qede_fastpath		*fp_array;
 	u16				num_rss;
 	u8				num_tc;
 #define QEDE_RSS_CNT(edev)		((edev)->num_rss)
@@ -58,6 +59,9 @@ struct qede_dev {
 					 (edev)->num_tc)
 #define QEDE_TSS_IDX(edev, txqidx)	((txqidx) % (edev)->num_rss)
 #define QEDE_TC_IDX(edev, txqidx)	((txqidx) / (edev)->num_rss)
+#define QEDE_TX_QUEUE(edev, txqidx)	\
+	(&(edev)->fp_array[QEDE_TSS_IDX((edev), (txqidx))].txqs[QEDE_TC_IDX( \
+							(edev), (txqidx))])
 
 	struct qed_int_info		int_info;
 	unsigned char			primary_mac[ETH_ALEN];
@@ -65,9 +69,133 @@ struct qede_dev {
 	/* Smaller private varaiant of the RTNL lock */
 	struct mutex			qede_lock;
 	u32				state; /* Protected by qede_lock */
+	u16				rx_buf_size;
+	/* L2 header size + 2*VLANs (8 bytes) + LLC SNAP (8 bytes) */
+#define ETH_OVERHEAD			(ETH_HLEN + 8 + 8)
+	/* Max supported alignment is 256 (8 shift)
+	 * minimal alignment shift 6 is optimal for 57xxx HW performance
+	 */
+#define QEDE_RX_ALIGN_SHIFT		max(6, min(8, L1_CACHE_SHIFT))
+	/* We assume skb_build() uses sizeof(struct skb_shared_info) bytes
+	 * at the end of skb->data, to avoid wasting a full cache line.
+	 * This reduces memory use (skb->truesize).
+	 */
+#define QEDE_FW_RX_ALIGN_END					\
+	max_t(u64, 1UL << QEDE_RX_ALIGN_SHIFT,			\
+	      SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+
+	struct qed_update_vport_rss_params	rss_params;
+	u16			q_num_rx_buffers; /* Must be a power of two */
+	u16			q_num_tx_buffers; /* Must be a power of two */
+};
+
+enum QEDE_STATE {
+	QEDE_STATE_CLOSED,
+	QEDE_STATE_OPEN,
+};
+
+#define HILO_U64(hi, lo)		((((u64)(hi)) << 32) + (lo))
+
+#define	MAX_NUM_TC	8
+#define	MAX_NUM_PRI	8
+
+/* The driver supports the new build_skb() API:
+ * RX ring buffer contains pointer to kmalloc() data only,
+ * skb are built only after the frame was DMA-ed.
+ */
+struct sw_rx_data {
+	u8 *data;
+
+	DEFINE_DMA_UNMAP_ADDR(mapping);
+};
+
+struct qede_rx_queue {
+	__le16			*hw_cons_ptr;
+	struct sw_rx_data	*sw_rx_ring;
+	u16			sw_rx_cons;
+	u16			sw_rx_prod;
+	struct qed_chain	rx_bd_ring;
+	struct qed_chain	rx_comp_ring;
+	void __iomem		*hw_rxq_prod_addr;
+
+	int			rx_buf_size;
+
+	u16			num_rx_buffers;
+	u16			rxq_id;
+
+	u64			rx_hw_errors;
+	u64			rx_alloc_errors;
+};
+
+union db_prod {
+	struct eth_db_data data;
+	u32		raw;
+};
+
+struct sw_tx_bd {
+	struct sk_buff *skb;
+	u8 flags;
+/* Set on the first BD descriptor when there is a split BD */
+#define QEDE_TSO_SPLIT_BD		BIT(0)
+};
+
+struct qede_tx_queue {
+	int			index; /* Queue index */
+	__le16			*hw_cons_ptr;
+	struct sw_tx_bd		*sw_tx_ring;
+	u16			sw_tx_cons;
+	u16			sw_tx_prod;
+	struct qed_chain	tx_pbl;
+	void __iomem		*doorbell_addr;
+	union db_prod		tx_db;
+
+	u16			num_tx_buffers;
+};
+
+#define BD_UNMAP_ADDR(bd)		HILO_U64(le32_to_cpu((bd)->addr.hi), \
+						 le32_to_cpu((bd)->addr.lo))
+#define BD_SET_UNMAP_ADDR_LEN(bd, maddr, len)				\
+	do {								\
+		(bd)->addr.hi = cpu_to_le32(upper_32_bits(maddr));	\
+		(bd)->addr.lo = cpu_to_le32(lower_32_bits(maddr));	\
+		(bd)->nbytes = cpu_to_le16(len);			\
+	} while (0)
+#define BD_UNMAP_LEN(bd)		(le16_to_cpu((bd)->nbytes))
+
+struct qede_fastpath {
+	struct qede_dev	*edev;
+	u8			rss_id;
+	struct napi_struct	napi;
+	struct qed_sb_info	*sb_info;
+	struct qede_rx_queue	*rxq;
+	struct qede_tx_queue	*txqs;
+
+#define VEC_NAME_SIZE	(sizeof(((struct net_device *)0)->name) + 8)
+	char	name[VEC_NAME_SIZE];
 };
 
 /* Debug print definitions */
 #define DP_NAME(edev) ((edev)->ndev->name)
 
+#define XMIT_PLAIN		0
+#define XMIT_L4_CSUM		BIT(0)
+#define XMIT_LSO		BIT(1)
+#define XMIT_ENC		BIT(2)
+
+#define QEDE_CSUM_ERROR			BIT(0)
+#define QEDE_CSUM_UNNECESSARY		BIT(1)
+#define RX_RING_SIZE_POW	13
+#define RX_RING_SIZE		BIT(RX_RING_SIZE_POW)
+#define NUM_RX_BDS_MAX		(RX_RING_SIZE - 1)
+#define NUM_RX_BDS_MIN		128
+#define NUM_RX_BDS_DEF		NUM_RX_BDS_MAX
+
+#define TX_RING_SIZE_POW	13
+#define TX_RING_SIZE		BIT(TX_RING_SIZE_POW)
+#define NUM_TX_BDS_MAX		(TX_RING_SIZE - 1)
+#define NUM_TX_BDS_MIN		128
+#define NUM_TX_BDS_DEF		NUM_TX_BDS_MAX
+
+#define	for_each_rss(i) for (i = 0; i < edev->num_rss; i++)
+
 #endif /* _QEDE_H_ */