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net/mlx4_core: Introduce mlx4_get_module_info for cable module info reading 

Added new MAD_IFC command to read cable module info with attribute id (0xFF60).
Update include/linux/mlx4/device.h with function declaration (mlx4_get_module_info)
and the needed defines/enums for future use.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Saeed Mahameed 2014-10-27 11:37:35 +02:00 committed by David S. Miller
parent 941d8ebcf7
commit 32a173c7f9
2 changed files with 186 additions and 0 deletions
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156
drivers/net/ethernet/mellanox/mlx4/port.c
View File

@ -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);

30
include/linux/mlx4/device.h
View File

@ -379,6 +379,13 @@ enum {
#define MSTR_SM_CHANGE_MASK (MLX4_EQ_PORT_INFO_MSTR_SM_SL_CHANGE_MASK | \
MLX4_EQ_PORT_INFO_MSTR_SM_LID_CHANGE_MASK)
enum mlx4_module_id {
MLX4_MODULE_ID_SFP = 0x3,
MLX4_MODULE_ID_QSFP = 0xC,
MLX4_MODULE_ID_QSFP_PLUS = 0xD,
MLX4_MODULE_ID_QSFP28 = 0x11,
};
static inline u64 mlx4_fw_ver(u64 major, u64 minor, u64 subminor)
{
return (major << 32) | (minor << 16) | subminor;
@ -799,6 +806,26 @@ struct mlx4_init_port_param {
u64 si_guid;
};
#define MAD_IFC_DATA_SZ 192
/* MAD IFC Mailbox */
struct mlx4_mad_ifc {
u8 base_version;
u8 mgmt_class;
u8 class_version;
u8 method;
__be16 status;
__be16 class_specific;
__be64 tid;
__be16 attr_id;
__be16 resv;
__be32 attr_mod;
__be64 mkey;
__be16 dr_slid;
__be16 dr_dlid;
u8 reserved[28];
u8 data[MAD_IFC_DATA_SZ];
} __packed;
#define mlx4_foreach_port(port, dev, type) \
for ((port) = 1; (port) <= (dev)->caps.num_ports; (port)++) \
if ((type) == (dev)->caps.port_mask[(port)])
@ -1283,6 +1310,9 @@ int mlx4_mr_rereg_mem_write(struct mlx4_dev *dev, struct mlx4_mr *mr,
u64 iova, u64 size, int npages,
int page_shift, struct mlx4_mpt_entry *mpt_entry);
int mlx4_get_module_info(struct mlx4_dev *dev, u8 port,
u16 offset, u16 size, u8 *data);
/* Returns true if running in low memory profile (kdump kernel) */
static inline bool mlx4_low_memory_profile(void)
{