net: add Hisilicon Network Subsystem hnae framework support

HNAE (Hisilicon Network Acceleration Engine) is a framework to provide a
unified ring buffer interface for Hisilicon Network Acceleration
Engines.

With the interface, upper layer can work as ethernet driver, ODP driver
or other service driver on purpose.

Signed-off-by: huangdaode <huangdaode@hisilicon.com>
Signed-off-by: Kenneth Lee <liguozhu@huawei.com>
Signed-off-by: Yisen Zhuang <Yisen.Zhuang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 583 insertions, 0 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns/hnae.h b/drivers/net/ethernet/hisilicon/hns/hnae.h
new file mode 100644
index 000000000000..5edd8cdc2485
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hns/hnae.h
@@ -0,0 +1,583 @@
+/*
+ * Copyright (c) 2014-2015 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __HNAE_H
+#define __HNAE_H
+
+/* Names used in this framework:
+ *      ae handle (handle):
+ *        a set of queues provided by AE
+ *      ring buffer queue (rbq):
+ *        the channel between upper layer and the AE, can do tx and rx
+ *      ring:
+ *        a tx or rx channel within a rbq
+ *      ring description (desc):
+ *        an element in the ring with packet information
+ *      buffer:
+ *        a memory region referred by desc with the full packet payload
+ *
+ * "num" means a static number set as a parameter, "count" mean a dynamic
+ *   number set while running
+ * "cb" means control block
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/notifier.h>
+#include <linux/types.h>
+
+#define HNAE_DRIVER_VERSION "1.3.0"
+#define HNAE_DRIVER_NAME "hns"
+#define HNAE_COPYRIGHT "Copyright(c) 2015 Huawei Corporation."
+#define HNAE_DRIVER_STRING "Hisilicon Network Subsystem Driver"
+#define HNAE_DEFAULT_DEVICE_DESCR "Hisilicon Network Subsystem"
+
+#ifdef DEBUG
+
+#ifndef assert
+#define assert(expr) \
+do { \
+	if (!(expr)) { \
+		pr_err("Assertion failed! %s, %s, %s, line %d\n", \
+			   #expr, __FILE__, __func__, __LINE__); \
+	} \
+} while (0)
+#endif
+
+#else
+
+#ifndef assert
+#define assert(expr)
+#endif
+
+#endif
+
+#define AE_VERSION_1 ('6' << 16 | '6' << 8 | '0')
+#define AE_VERSION_2 ('1' << 24 | '6' << 16 | '1' << 8 | '0')
+#define AE_NAME_SIZE 16
+
+/* some said the RX and TX RCB format should not be the same in the future. But
+ * it is the same now...
+ */
+#define RCB_REG_BASEADDR_L         0x00 /* P660 support only 32bit accessing */
+#define RCB_REG_BASEADDR_H         0x04
+#define RCB_REG_BD_NUM             0x08
+#define RCB_REG_BD_LEN             0x0C
+#define RCB_REG_PKTLINE            0x10
+#define RCB_REG_TAIL               0x18
+#define RCB_REG_HEAD               0x1C
+#define RCB_REG_FBDNUM             0x20
+#define RCB_REG_OFFSET             0x24 /* pkt num to be handled */
+#define RCB_REG_PKTNUM_RECORD      0x2C /* total pkt received */
+
+#define HNS_RX_HEAD_SIZE 256
+
+#define HNAE_AE_REGISTER 0x1
+
+#define RCB_RING_NAME_LEN 16
+
+enum hnae_led_state {
+	HNAE_LED_INACTIVE,
+	HNAE_LED_ACTIVE,
+	HNAE_LED_ON,
+	HNAE_LED_OFF
+};
+
+#define HNS_RX_FLAG_VLAN_PRESENT 0x1
+#define HNS_RX_FLAG_L3ID_IPV4 0x0
+#define HNS_RX_FLAG_L3ID_IPV6 0x1
+#define HNS_RX_FLAG_L4ID_UDP 0x0
+#define HNS_RX_FLAG_L4ID_TCP 0x1
+
+#define HNS_TXD_ASID_S 0
+#define HNS_TXD_ASID_M (0xff << HNS_TXD_ASID_S)
+#define HNS_TXD_BUFNUM_S 8
+#define HNS_TXD_BUFNUM_M (0x3 << HNS_TXD_BUFNUM_S)
+#define HNS_TXD_PORTID_S 10
+#define HNS_TXD_PORTID_M (0x7 << HNS_TXD_PORTID_S)
+
+#define HNS_TXD_RA_B 8
+#define HNS_TXD_RI_B 9
+#define HNS_TXD_L4CS_B 10
+#define HNS_TXD_L3CS_B 11
+#define HNS_TXD_FE_B 12
+#define HNS_TXD_VLD_B 13
+#define HNS_TXD_IPOFFSET_S 14
+#define HNS_TXD_IPOFFSET_M (0xff << HNS_TXD_IPOFFSET_S)
+
+#define HNS_RXD_IPOFFSET_S 0
+#define HNS_RXD_IPOFFSET_M (0xff << HNS_TXD_IPOFFSET_S)
+#define HNS_RXD_BUFNUM_S 8
+#define HNS_RXD_BUFNUM_M (0x3 << HNS_RXD_BUFNUM_S)
+#define HNS_RXD_PORTID_S 10
+#define HNS_RXD_PORTID_M (0x7 << HNS_RXD_PORTID_S)
+#define HNS_RXD_DMAC_S 13
+#define HNS_RXD_DMAC_M (0x3 << HNS_RXD_DMAC_S)
+#define HNS_RXD_VLAN_S 15
+#define HNS_RXD_VLAN_M (0x3 << HNS_RXD_VLAN_S)
+#define HNS_RXD_L3ID_S 17
+#define HNS_RXD_L3ID_M (0xf << HNS_RXD_L3ID_S)
+#define HNS_RXD_L4ID_S 21
+#define HNS_RXD_L4ID_M (0xf << HNS_RXD_L4ID_S)
+#define HNS_RXD_FE_B 25
+#define HNS_RXD_FRAG_B 26
+#define HNS_RXD_VLD_B 27
+#define HNS_RXD_L2E_B 28
+#define HNS_RXD_L3E_B 29
+#define HNS_RXD_L4E_B 30
+#define HNS_RXD_DROP_B 31
+
+#define HNS_RXD_VLANID_S 8
+#define HNS_RXD_VLANID_M (0xfff << HNS_RXD_VLANID_S)
+#define HNS_RXD_CFI_B 20
+#define HNS_RXD_PRI_S 21
+#define HNS_RXD_PRI_M (0x7 << HNS_RXD_PRI_S)
+#define HNS_RXD_ASID_S 24
+#define HNS_RXD_ASID_M (0xff << HNS_RXD_ASID_S)
+
+/* hardware spec ring buffer format */
+struct __packed hnae_desc {
+	__le64 addr;
+	union {
+		struct {
+			__le16 asid_bufnum_pid;
+			__le16 send_size;
+			__le32 flag_ipoffset;
+			__le32 reserved_3[4];
+		} tx;
+
+		struct {
+			__le32 ipoff_bnum_pid_flag;
+			__le16 pkt_len;
+			__le16 size;
+			__le32 vlan_pri_asid;
+			__le32 reserved_2[3];
+		} rx;
+	};
+};
+
+struct hnae_desc_cb {
+	dma_addr_t dma; /* dma address of this desc */
+	void *buf;      /* cpu addr for a desc */
+
+	/* priv data for the desc, e.g. skb when use with ip stack*/
+	void *priv;
+	u16 page_offset;
+	u16 reuse_flag;
+
+	u16 length;     /* length of the buffer */
+
+       /* desc type, used by the ring user to mark the type of the priv data */
+	u16 type;
+};
+
+#define setflags(flags, bits) ((flags) |= (bits))
+#define unsetflags(flags, bits) ((flags) &= ~(bits))
+
+/* hnae_ring->flags fields */
+#define RINGF_DIR 0x1	    /* TX or RX ring, set if TX */
+#define is_tx_ring(ring) ((ring)->flags & RINGF_DIR)
+#define is_rx_ring(ring) (!is_tx_ring(ring))
+#define ring_to_dma_dir(ring) (is_tx_ring(ring) ? \
+	DMA_TO_DEVICE : DMA_FROM_DEVICE)
+
+struct ring_stats {
+	u64 io_err_cnt;
+	u64 sw_err_cnt;
+	u64 seg_pkt_cnt;
+	union {
+		struct {
+			u64 tx_pkts;
+			u64 tx_bytes;
+			u64 tx_err_cnt;
+			u64 restart_queue;
+			u64 tx_busy;
+		};
+		struct {
+			u64 rx_pkts;
+			u64 rx_bytes;
+			u64 rx_err_cnt;
+			u64 reuse_pg_cnt;
+			u64 err_pkt_len;
+			u64 non_vld_descs;
+			u64 err_bd_num;
+			u64 l2_err;
+			u64 l3l4_csum_err;
+		};
+	};
+};
+
+struct hnae_queue;
+
+struct hnae_ring {
+	u8 __iomem *io_base; /* base io address for the ring */
+	struct hnae_desc *desc; /* dma map address space */
+	struct hnae_desc_cb *desc_cb;
+	struct hnae_queue *q;
+	int irq;
+	char ring_name[RCB_RING_NAME_LEN];
+
+	/* statistic */
+	struct ring_stats stats;
+
+	dma_addr_t desc_dma_addr;
+	u32 buf_size;       /* size for hnae_desc->addr, preset by AE */
+	u16 desc_num;       /* total number of desc */
+	u16 max_desc_num_per_pkt;
+	u16 max_raw_data_sz_per_desc;
+	u16 max_pkt_size;
+	int next_to_use;    /* idx of next spare desc */
+
+	/* idx of lastest sent desc, the ring is empty when equal to
+	 * next_to_use
+	 */
+	int next_to_clean;
+
+	int flags;          /* ring attribute */
+	int irq_init_flag;
+};
+
+#define ring_ptr_move_fw(ring, p) \
+	((ring)->p = ((ring)->p + 1) % (ring)->desc_num)
+#define ring_ptr_move_bw(ring, p) \
+	((ring)->p = ((ring)->p - 1 + (ring)->desc_num) % (ring)->desc_num)
+
+enum hns_desc_type {
+	DESC_TYPE_SKB,
+	DESC_TYPE_PAGE,
+};
+
+#define assert_is_ring_idx(ring, idx) \
+	assert((idx) >= 0 && (idx) < (ring)->desc_num)
+
+/* the distance between [begin, end) in a ring buffer
+ * note: there is a unuse slot between the begin and the end
+ */
+static inline int ring_dist(struct hnae_ring *ring, int begin, int end)
+{
+	assert_is_ring_idx(ring, begin);
+	assert_is_ring_idx(ring, end);
+
+	return (end - begin + ring->desc_num) % ring->desc_num;
+}
+
+static inline int ring_space(struct hnae_ring *ring)
+{
+	return ring->desc_num -
+		ring_dist(ring, ring->next_to_clean, ring->next_to_use) - 1;
+}
+
+static inline int is_ring_empty(struct hnae_ring *ring)
+{
+	assert_is_ring_idx(ring, ring->next_to_use);
+	assert_is_ring_idx(ring, ring->next_to_clean);
+
+	return ring->next_to_use == ring->next_to_clean;
+}
+
+#define hnae_buf_size(_ring) ((_ring)->buf_size)
+#define hnae_page_order(_ring) (get_order(hnae_buf_size(_ring)))
+#define hnae_page_size(_ring) (PAGE_SIZE << hnae_page_order(_ring))
+
+struct hnae_handle;
+
+/* allocate and dma map space for hnae desc */
+struct hnae_buf_ops {
+	int (*alloc_buffer)(struct hnae_ring *ring, struct hnae_desc_cb *cb);
+	void (*free_buffer)(struct hnae_ring *ring, struct hnae_desc_cb *cb);
+	int (*map_buffer)(struct hnae_ring *ring, struct hnae_desc_cb *cb);
+	void (*unmap_buffer)(struct hnae_ring *ring, struct hnae_desc_cb *cb);
+};
+
+struct hnae_queue {
+	void __iomem *io_base;
+	phys_addr_t phy_base;
+	struct hnae_ae_dev *dev;	/* the device who use this queue */
+	struct hnae_ring rx_ring, tx_ring;
+	struct hnae_handle *handle;
+};
+
+/*hnae loop mode*/
+enum hnae_loop {
+	MAC_INTERNALLOOP_MAC = 0,
+	MAC_INTERNALLOOP_SERDES,
+	MAC_INTERNALLOOP_PHY,
+	MAC_LOOP_NONE,
+};
+
+/*hnae port type*/
+enum hnae_port_type {
+	HNAE_PORT_SERVICE = 0,
+	HNAE_PORT_DEBUG
+};
+
+/* This struct defines the operation on the handle.
+ *
+ * get_handle(): (mandatory)
+ *   Get a handle from AE according to its name and options.
+ *   the AE driver should manage the space used by handle and its queues while
+ *   the HNAE framework will allocate desc and desc_cb for all rings in the
+ *   queues.
+ * put_handle():
+ *   Release the handle.
+ * start():
+ *   Enable the hardware, include all queues
+ * stop():
+ *   Disable the hardware
+ * set_opts(): (mandatory)
+ *   Set options to the AE
+ * get_opts(): (mandatory)
+ *   Get options from the AE
+ * get_status():
+ *   Get the carrier state of the back channel of the handle, 1 for ok, 0 for
+ *   non-ok
+ * toggle_ring_irq(): (mandatory)
+ *   Set the ring irq to be enabled(0) or disable(1)
+ * toggle_queue_status(): (mandatory)
+ *   Set the queue to be enabled(1) or disable(0), this will not change the
+ *   ring irq state
+ * adjust_link()
+ *   adjust link status
+ * set_loopback()
+ *   set loopback
+ * get_ring_bdnum_limit()
+ *   get ring bd number limit
+ * get_pauseparam()
+ *   get tx and rx of pause frame use
+ * set_autoneg()
+ *   set auto autonegotiation of pause frame use
+ * get_autoneg()
+ *   get auto autonegotiation of pause frame use
+ * set_pauseparam()
+ *   set tx and rx of pause frame use
+ * get_coalesce_usecs()
+ *   get usecs to delay a TX interrupt after a packet is sent
+ * get_rx_max_coalesced_frames()
+ *   get Maximum number of packets to be sent before a TX interrupt.
+ * set_coalesce_usecs()
+ *   set usecs to delay a TX interrupt after a packet is sent
+ * set_coalesce_frames()
+ *   set Maximum number of packets to be sent before a TX interrupt.
+ * get_ringnum()
+ *   get RX/TX ring number
+ * get_max_ringnum()
+ *   get RX/TX ring maximum number
+ * get_mac_addr()
+ *   get mac address
+ * set_mac_addr()
+ *   set mac address
+ * set_mc_addr()
+ *   set multicast mode
+ * set_mtu()
+ *   set mtu
+ * update_stats()
+ *   update Old network device statistics
+ * get_ethtool_stats()
+ *   get ethtool network device statistics
+ * get_strings()
+ *   get a set of strings that describe the requested objects
+ * get_sset_count()
+ *   get number of strings that @get_strings will write
+ * update_led_status()
+ *   update the led status
+ * set_led_id()
+ *   set led id
+ * get_regs()
+ *   get regs dump
+ * get_regs_len()
+ *   get the len of the regs dump
+ */
+struct hnae_ae_ops {
+	struct hnae_handle *(*get_handle)(struct hnae_ae_dev *dev,
+					  u32 port_id);
+	void (*put_handle)(struct hnae_handle *handle);
+	void (*init_queue)(struct hnae_queue *q);
+	void (*fini_queue)(struct hnae_queue *q);
+	int (*start)(struct hnae_handle *handle);
+	void (*stop)(struct hnae_handle *handle);
+	void (*reset)(struct hnae_handle *handle);
+	int (*set_opts)(struct hnae_handle *handle, int type, void *opts);
+	int (*get_opts)(struct hnae_handle *handle, int type, void **opts);
+	int (*get_status)(struct hnae_handle *handle);
+	int (*get_info)(struct hnae_handle *handle,
+			u8 *auto_neg, u16 *speed, u8 *duplex);
+	void (*toggle_ring_irq)(struct hnae_ring *ring, u32 val);
+	void (*toggle_queue_status)(struct hnae_queue *queue, u32 val);
+	void (*adjust_link)(struct hnae_handle *handle, int speed, int duplex);
+	int (*set_loopback)(struct hnae_handle *handle,
+			    enum hnae_loop loop_mode, int en);
+	void (*get_ring_bdnum_limit)(struct hnae_queue *queue,
+				     u32 *uplimit);
+	void (*get_pauseparam)(struct hnae_handle *handle,
+			       u32 *auto_neg, u32 *rx_en, u32 *tx_en);
+	int (*set_autoneg)(struct hnae_handle *handle, u8 enable);
+	int (*get_autoneg)(struct hnae_handle *handle);
+	int (*set_pauseparam)(struct hnae_handle *handle,
+			      u32 auto_neg, u32 rx_en, u32 tx_en);
+	void (*get_coalesce_usecs)(struct hnae_handle *handle,
+				   u32 *tx_usecs, u32 *rx_usecs);
+	void (*get_rx_max_coalesced_frames)(struct hnae_handle *handle,
+					    u32 *tx_frames, u32 *rx_frames);
+	void (*set_coalesce_usecs)(struct hnae_handle *handle, u32 timeout);
+	int (*set_coalesce_frames)(struct hnae_handle *handle,
+				   u32 coalesce_frames);
+	int (*get_mac_addr)(struct hnae_handle *handle, void **p);
+	int (*set_mac_addr)(struct hnae_handle *handle, void *p);
+	int (*set_mc_addr)(struct hnae_handle *handle, void *addr);
+	int (*set_mtu)(struct hnae_handle *handle, int new_mtu);
+	void (*update_stats)(struct hnae_handle *handle,
+			     struct net_device_stats *net_stats);
+	void (*get_stats)(struct hnae_handle *handle, u64 *data);
+	void (*get_strings)(struct hnae_handle *handle,
+			    u32 stringset, u8 *data);
+	int (*get_sset_count)(struct hnae_handle *handle, int stringset);
+	void (*update_led_status)(struct hnae_handle *handle);
+	int (*set_led_id)(struct hnae_handle *handle,
+			  enum hnae_led_state status);
+	void (*get_regs)(struct hnae_handle *handle, void *data);
+	int (*get_regs_len)(struct hnae_handle *handle);
+};
+
+struct hnae_ae_dev {
+	struct device cls_dev; /* the class dev */
+	struct device *dev; /* the presented dev */
+	struct hnae_ae_ops *ops;
+	struct list_head node;
+	struct module *owner; /* the module who provides this dev */
+	int id;
+	char name[AE_NAME_SIZE];
+	struct list_head handle_list;
+	spinlock_t lock; /* lock to protect the handle_list */
+};
+
+struct hnae_handle {
+	struct device *owner_dev; /* the device which make use of this handle */
+	struct hnae_ae_dev *dev;  /* the device who provides this handle */
+	struct device_node *phy_node;
+	phy_interface_t phy_if;
+	u32 if_support;
+	int q_num;
+	int vf_id;
+	u32 eport_id;
+	enum hnae_port_type port_type;
+	struct list_head node;    /* list to hnae_ae_dev->handle_list */
+	struct hnae_buf_ops *bops; /* operation for the buffer */
+	struct hnae_queue **qs;  /* array base of all queues */
+};
+
+#define ring_to_dev(ring) ((ring)->q->dev->dev)
+
+struct hnae_handle *hnae_get_handle(struct device *owner_dev, const char *ae_id,
+				    u32 port_id, struct hnae_buf_ops *bops);
+void hnae_put_handle(struct hnae_handle *handle);
+int hnae_ae_register(struct hnae_ae_dev *dev, struct module *owner);
+void hnae_ae_unregister(struct hnae_ae_dev *dev);
+
+int hnae_register_notifier(struct notifier_block *nb);
+void hnae_unregister_notifier(struct notifier_block *nb);
+int hnae_reinit_handle(struct hnae_handle *handle);
+
+#define hnae_queue_xmit(q, buf_num) writel_relaxed(buf_num, \
+	(q)->tx_ring.io_base + RCB_REG_TAIL)
+
+#ifndef assert
+#define assert(cond)
+#endif
+
+static inline int hnae_reserve_buffer_map(struct hnae_ring *ring,
+					  struct hnae_desc_cb *cb)
+{
+	struct hnae_buf_ops *bops = ring->q->handle->bops;
+	int ret;
+
+	ret = bops->alloc_buffer(ring, cb);
+	if (ret)
+		goto out;
+
+	ret = bops->map_buffer(ring, cb);
+	if (ret)
+		goto out_with_buf;
+
+	return 0;
+
+out_with_buf:
+	bops->free_buffer(ring, cb);
+out:
+	return ret;
+}
+
+static inline int hnae_alloc_buffer_attach(struct hnae_ring *ring, int i)
+{
+	int ret = hnae_reserve_buffer_map(ring, &ring->desc_cb[i]);
+
+	if (ret)
+		return ret;
+
+	ring->desc[i].addr = (__le64)ring->desc_cb[i].dma;
+
+	return 0;
+}
+
+static inline void hnae_buffer_detach(struct hnae_ring *ring, int i)
+{
+	ring->q->handle->bops->unmap_buffer(ring, &ring->desc_cb[i]);
+	ring->desc[i].addr = 0;
+}
+
+static inline void hnae_free_buffer_detach(struct hnae_ring *ring, int i)
+{
+	struct hnae_buf_ops *bops = ring->q->handle->bops;
+	struct hnae_desc_cb *cb = &ring->desc_cb[i];
+
+	if (!ring->desc_cb[i].dma)
+		return;
+
+	hnae_buffer_detach(ring, i);
+	bops->free_buffer(ring, cb);
+}
+
+/* detach a in-used buffer and replace with a reserved one  */
+static inline void hnae_replace_buffer(struct hnae_ring *ring, int i,
+				       struct hnae_desc_cb *res_cb)
+{
+	struct hnae_buf_ops *bops = ring->q->handle->bops;
+	struct hnae_desc_cb tmp_cb = ring->desc_cb[i];
+
+	bops->unmap_buffer(ring, &ring->desc_cb[i]);
+	ring->desc_cb[i] = *res_cb;
+	*res_cb = tmp_cb;
+	ring->desc[i].addr = (__le64)ring->desc_cb[i].dma;
+	ring->desc[i].rx.ipoff_bnum_pid_flag = 0;
+}
+
+static inline void hnae_reuse_buffer(struct hnae_ring *ring, int i)
+{
+	ring->desc_cb[i].reuse_flag = 0;
+	ring->desc[i].addr = (__le64)(ring->desc_cb[i].dma
+		+ ring->desc_cb[i].page_offset);
+	ring->desc[i].rx.ipoff_bnum_pid_flag = 0;
+}
+
+#define hnae_set_field(origin, mask, shift, val) \
+	do { \
+		(origin) &= (~(mask)); \
+		(origin) |= ((val) << (shift)) & (mask); \
+	} while (0)
+
+#define hnae_set_bit(origin, shift, val) \
+	hnae_set_field((origin), (0x1 << (shift)), (shift), (val))
+
+#define hnae_get_field(origin, mask, shift) (((origin) & (mask)) >> (shift))
+
+#define hnae_get_bit(origin, shift) \
+	hnae_get_field((origin), (0x1 << (shift)), (shift))
+
+#endif