diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/port.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/port.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/port.c b/drivers/net/ethernet/mellanox/mlx4/port.c index 94eeb2c7d7e4..30eb1ead0fe6 100644 --- a/drivers/net/ethernet/mellanox/mlx4/port.c +++ b/drivers/net/ethernet/mellanox/mlx4/port.c @@ -1311,3 +1311,159 @@ int mlx4_get_roce_gid_from_slave(struct mlx4_dev *dev, int port, int slave_id, return 0; } EXPORT_SYMBOL(mlx4_get_roce_gid_from_slave); + +/* Cable Module Info */ +#define MODULE_INFO_MAX_READ 48 + +#define I2C_ADDR_LOW 0x50 +#define I2C_ADDR_HIGH 0x51 +#define I2C_PAGE_SIZE 256 + +/* Module Info Data */ +struct mlx4_cable_info { + u8 i2c_addr; + u8 page_num; + __be16 dev_mem_address; + __be16 reserved1; + __be16 size; + __be32 reserved2[2]; + u8 data[MODULE_INFO_MAX_READ]; +}; + +enum cable_info_err { + CABLE_INF_INV_PORT = 0x1, + CABLE_INF_OP_NOSUP = 0x2, + CABLE_INF_NOT_CONN = 0x3, + CABLE_INF_NO_EEPRM = 0x4, + CABLE_INF_PAGE_ERR = 0x5, + CABLE_INF_INV_ADDR = 0x6, + CABLE_INF_I2C_ADDR = 0x7, + CABLE_INF_QSFP_VIO = 0x8, + CABLE_INF_I2C_BUSY = 0x9, +}; + +#define MAD_STATUS_2_CABLE_ERR(mad_status) ((mad_status >> 8) & 0xFF) + +static inline const char *cable_info_mad_err_str(u16 mad_status) +{ + u8 err = MAD_STATUS_2_CABLE_ERR(mad_status); + + switch (err) { + case CABLE_INF_INV_PORT: + return "invalid port selected"; + case CABLE_INF_OP_NOSUP: + return "operation not supported for this port (the port is of type CX4 or internal)"; + case CABLE_INF_NOT_CONN: + return "cable is not connected"; + case CABLE_INF_NO_EEPRM: + return "the connected cable has no EPROM (passive copper cable)"; + case CABLE_INF_PAGE_ERR: + return "page number is greater than 15"; + case CABLE_INF_INV_ADDR: + return "invalid device_address or size (that is, size equals 0 or address+size is greater than 256)"; + case CABLE_INF_I2C_ADDR: + return "invalid I2C slave address"; + case CABLE_INF_QSFP_VIO: + return "at least one cable violates the QSFP specification and ignores the modsel signal"; + case CABLE_INF_I2C_BUSY: + return "I2C bus is constantly busy"; + } + return "Unknown Error"; +} + +/** + * mlx4_get_module_info - Read cable module eeprom data + * @dev: mlx4_dev. + * @port: port number. + * @offset: byte offset in eeprom to start reading data from. + * @size: num of bytes to read. + * @data: output buffer to put the requested data into. + * + * Reads cable module eeprom data, puts the outcome data into + * data pointer paramer. + * Returns num of read bytes on success or a negative error + * code. + */ +int mlx4_get_module_info(struct mlx4_dev *dev, u8 port, + u16 offset, u16 size, u8 *data) +{ + struct mlx4_cmd_mailbox *inbox, *outbox; + struct mlx4_mad_ifc *inmad, *outmad; + struct mlx4_cable_info *cable_info; + u16 i2c_addr; + int ret; + + if (size > MODULE_INFO_MAX_READ) + size = MODULE_INFO_MAX_READ; + + inbox = mlx4_alloc_cmd_mailbox(dev); + if (IS_ERR(inbox)) + return PTR_ERR(inbox); + + outbox = mlx4_alloc_cmd_mailbox(dev); + if (IS_ERR(outbox)) { + mlx4_free_cmd_mailbox(dev, inbox); + return PTR_ERR(outbox); + } + + inmad = (struct mlx4_mad_ifc *)(inbox->buf); + outmad = (struct mlx4_mad_ifc *)(outbox->buf); + + inmad->method = 0x1; /* Get */ + inmad->class_version = 0x1; + inmad->mgmt_class = 0x1; + inmad->base_version = 0x1; + inmad->attr_id = cpu_to_be16(0xFF60); /* Module Info */ + + if (offset < I2C_PAGE_SIZE && offset + size > I2C_PAGE_SIZE) + /* Cross pages reads are not allowed + * read until offset 256 in low page + */ + size -= offset + size - I2C_PAGE_SIZE; + + i2c_addr = I2C_ADDR_LOW; + if (offset >= I2C_PAGE_SIZE) { + /* Reset offset to high page */ + i2c_addr = I2C_ADDR_HIGH; + offset -= I2C_PAGE_SIZE; + } + + cable_info = (struct mlx4_cable_info *)inmad->data; + cable_info->dev_mem_address = cpu_to_be16(offset); + cable_info->page_num = 0; + cable_info->i2c_addr = i2c_addr; + cable_info->size = cpu_to_be16(size); + + ret = mlx4_cmd_box(dev, inbox->dma, outbox->dma, port, 3, + MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C, + MLX4_CMD_NATIVE); + if (ret) + goto out; + + if (be16_to_cpu(outmad->status)) { + /* Mad returned with bad status */ + ret = be16_to_cpu(outmad->status); + mlx4_warn(dev, + "MLX4_CMD_MAD_IFC Get Module info attr(%x) port(%d) i2c_addr(%x) offset(%d) size(%d): Response Mad Status(%x) - %s\n", + 0xFF60, port, i2c_addr, offset, size, + ret, cable_info_mad_err_str(ret)); + + if (i2c_addr == I2C_ADDR_HIGH && + MAD_STATUS_2_CABLE_ERR(ret) == CABLE_INF_I2C_ADDR) + /* Some SFP cables do not support i2c slave + * address 0x51 (high page), abort silently. + */ + ret = 0; + else + ret = -ret; + goto out; + } + cable_info = (struct mlx4_cable_info *)outmad->data; + memcpy(data, cable_info->data, size); + ret = size; +out: + mlx4_free_cmd_mailbox(dev, inbox); + mlx4_free_cmd_mailbox(dev, outbox); + return ret; +} +EXPORT_SYMBOL(mlx4_get_module_info); |