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34 #ifndef MLX5_FPGA_SDK_H
35 #define MLX5_FPGA_SDK_H
37 #include <linux/types.h>
38 #include <linux/dma-direction.h>
42 * This header defines the in-kernel API for Innova FPGA client drivers.
44 #define SBU_QP_QUEUE_SIZE 8
45 #define MLX5_FPGA_CMD_TIMEOUT_MSEC (60 * 1000)
48 * enum mlx5_fpga_access_type - Enumerated the different methods possible for
49 * accessing the device memory address space
51 enum mlx5_fpga_access_type {
52 /** Use the slow CX-FPGA I2C bus */
53 MLX5_FPGA_ACCESS_TYPE_I2C = 0x0,
54 /** Use the fastest available method */
55 MLX5_FPGA_ACCESS_TYPE_DONTCARE = 0x0,
58 struct mlx5_fpga_conn;
59 struct mlx5_fpga_device;
62 * struct mlx5_fpga_dma_entry - A scatter-gather DMA entry
64 struct mlx5_fpga_dma_entry {
65 /** @data: Virtual address pointer to the data */
67 /** @size: Size in bytes of the data */
69 /** @dma_addr: Private member. Physical DMA-mapped address of the data */
74 * struct mlx5_fpga_dma_buf - A packet buffer
75 * May contain up to 2 scatter-gather data entries
77 struct mlx5_fpga_dma_buf {
78 /** @dma_dir: DMA direction */
79 enum dma_data_direction dma_dir;
80 /** @sg: Scatter-gather entries pointing to the data in memory */
81 struct mlx5_fpga_dma_entry sg[2];
82 /** @list: Item in SQ backlog, for TX packets */
83 struct list_head list;
85 * @complete: Completion routine, for TX packets
86 * @conn: FPGA Connection this packet was sent to
87 * @fdev: FPGA device this packet was sent to
88 * @buf: The packet buffer
89 * @status: 0 if successful, or an error code otherwise
91 void (*complete)(struct mlx5_fpga_conn *conn,
92 struct mlx5_fpga_device *fdev,
93 struct mlx5_fpga_dma_buf *buf, u8 status);
97 * struct mlx5_fpga_conn_attr - FPGA connection attributes
98 * Describes the attributes of a connection
100 struct mlx5_fpga_conn_attr {
101 /** @tx_size: Size of connection TX queue, in packets */
102 unsigned int tx_size;
103 /** @rx_size: Size of connection RX queue, in packets */
104 unsigned int rx_size;
106 * @recv_cb: Callback function which is called for received packets
107 * @cb_arg: The value provided in mlx5_fpga_conn_attr.cb_arg
108 * @buf: A buffer containing a received packet
110 * buf is guaranteed to only contain a single scatter-gather entry.
111 * The size of the actual packet received is specified in buf.sg[0].size
112 * When this callback returns, the packet buffer may be re-used for
113 * subsequent receives.
115 void (*recv_cb)(void *cb_arg, struct mlx5_fpga_dma_buf *buf);
120 * mlx5_fpga_sbu_conn_create() - Initialize a new FPGA SBU connection
121 * @fdev: The FPGA device
122 * @attr: Attributes of the new connection
124 * Sets up a new FPGA SBU connection with the specified attributes.
125 * The receive callback function may be called for incoming messages even
126 * before this function returns.
128 * The caller must eventually destroy the connection by calling
129 * mlx5_fpga_sbu_conn_destroy.
131 * Return: A new connection, or ERR_PTR() error value otherwise.
133 struct mlx5_fpga_conn *
134 mlx5_fpga_sbu_conn_create(struct mlx5_fpga_device *fdev,
135 struct mlx5_fpga_conn_attr *attr);
138 * mlx5_fpga_sbu_conn_destroy() - Destroy an FPGA SBU connection
139 * @conn: The FPGA SBU connection to destroy
141 * Cleans up an FPGA SBU connection which was previously created with
142 * mlx5_fpga_sbu_conn_create.
144 void mlx5_fpga_sbu_conn_destroy(struct mlx5_fpga_conn *conn);
147 * mlx5_fpga_sbu_conn_sendmsg() - Queue the transmission of a packet
148 * @fdev: An FPGA SBU connection
149 * @buf: The packet buffer
151 * Queues a packet for transmission over an FPGA SBU connection.
152 * The buffer should not be modified or freed until completion.
153 * Upon completion, the buf's complete() callback is invoked, indicating the
154 * success or error status of the transmission.
156 * Return: 0 if successful, or an error value otherwise.
158 int mlx5_fpga_sbu_conn_sendmsg(struct mlx5_fpga_conn *conn,
159 struct mlx5_fpga_dma_buf *buf);
162 * mlx5_fpga_mem_read() - Read from FPGA memory address space
163 * @fdev: The FPGA device
164 * @size: Size of chunk to read, in bytes
165 * @addr: Starting address to read from, in FPGA address space
166 * @buf: Buffer to read into
167 * @access_type: Method for reading
169 * Reads from the specified address into the specified buffer.
170 * The address may point to configuration space or to DDR.
171 * Large reads may be performed internally as several non-atomic operations.
172 * This function may sleep, so should not be called from atomic contexts.
174 * Return: 0 if successful, or an error value otherwise.
176 int mlx5_fpga_mem_read(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
177 void *buf, enum mlx5_fpga_access_type access_type);
180 * mlx5_fpga_mem_write() - Write to FPGA memory address space
181 * @fdev: The FPGA device
182 * @size: Size of chunk to write, in bytes
183 * @addr: Starting address to write to, in FPGA address space
184 * @buf: Buffer which contains data to write
185 * @access_type: Method for writing
187 * Writes the specified buffer data to FPGA memory at the specified address.
188 * The address may point to configuration space or to DDR.
189 * Large writes may be performed internally as several non-atomic operations.
190 * This function may sleep, so should not be called from atomic contexts.
192 * Return: 0 if successful, or an error value otherwise.
194 int mlx5_fpga_mem_write(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
195 void *buf, enum mlx5_fpga_access_type access_type);
198 * mlx5_fpga_get_sbu_caps() - Read the SBU capabilities
199 * @fdev: The FPGA device
200 * @size: Size of the buffer to read into
201 * @buf: Buffer to read the capabilities into
203 * Reads the FPGA SBU capabilities into the specified buffer.
204 * The format of the capabilities buffer is SBU-dependent.
206 * Return: 0 if successful
207 * -EINVAL if the buffer is not large enough to contain SBU caps
208 * or any other error value otherwise.
210 int mlx5_fpga_get_sbu_caps(struct mlx5_fpga_device *fdev, int size, void *buf);
212 #endif /* MLX5_FPGA_SDK_H */