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net/mlx5: Fix eeprom support for SFP module 

[ Upstream commit 47afbdd2fa ]

Fix eeprom SFP query support by setting i2c_addr, offset and page number
correctly. Unlike QSFP modules, SFP eeprom params are as follow:
- i2c_addr is 0x50 for offset 0 - 255 and 0x51 for offset 256 - 511.
- Page number is always zero.
- Page offset is always relative to zero.

As part of eeprom query, query the module ID (SFP / QSFP*) via helper
function to set the params accordingly.

In addition, change mlx5_qsfp_eeprom_page() input type to be u16 to avoid
unnecessary casting.

Fixes: a708fb7b1f ("net/mlx5e: ethtool, Add support for EEPROM high pages query")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Eran Ben Elisha 2020-06-14 17:31:26 +03:00 committed by Greg Kroah-Hartman
parent f277e0be69
commit ce27893535
1 changed files with 77 additions and 16 deletions
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93
drivers/net/ethernet/mellanox/mlx5/core/port.c
View File

@ -293,7 +293,40 @@ static int mlx5_query_module_num(struct mlx5_core_dev *dev, int *module_num)
return 0;
}
static int mlx5_eeprom_page(int offset)
static int mlx5_query_module_id(struct mlx5_core_dev *dev, int module_num,
u8 *module_id)
{
u32 in[MLX5_ST_SZ_DW(mcia_reg)] = {};
u32 out[MLX5_ST_SZ_DW(mcia_reg)];
int err, status;
u8 *ptr;
MLX5_SET(mcia_reg, in, i2c_device_address, MLX5_I2C_ADDR_LOW);
MLX5_SET(mcia_reg, in, module, module_num);
MLX5_SET(mcia_reg, in, device_address, 0);
MLX5_SET(mcia_reg, in, page_number, 0);
MLX5_SET(mcia_reg, in, size, 1);
MLX5_SET(mcia_reg, in, l, 0);
err = mlx5_core_access_reg(dev, in, sizeof(in), out,
sizeof(out), MLX5_REG_MCIA, 0, 0);
if (err)
return err;
status = MLX5_GET(mcia_reg, out, status);
if (status) {
mlx5_core_err(dev, "query_mcia_reg failed: status: 0x%x\n",
status);
return -EIO;
}
ptr = MLX5_ADDR_OF(mcia_reg, out, dword_0);
*module_id = ptr[0];
return 0;
}
static int mlx5_qsfp_eeprom_page(u16 offset)
{
if (offset < MLX5_EEPROM_PAGE_LENGTH)
/* Addresses between 0-255 - page 00 */
@ -307,7 +340,7 @@ static int mlx5_eeprom_page(int offset)
MLX5_EEPROM_HIGH_PAGE_LENGTH);
}
static int mlx5_eeprom_high_page_offset(int page_num)
static int mlx5_qsfp_eeprom_high_page_offset(int page_num)
{
if (!page_num) /* Page 0 always start from low page */
return 0;
@ -316,35 +349,62 @@ static int mlx5_eeprom_high_page_offset(int page_num)
return page_num * MLX5_EEPROM_HIGH_PAGE_LENGTH;
}
static void mlx5_qsfp_eeprom_params_set(u16 *i2c_addr, int *page_num, u16 *offset)
{
*i2c_addr = MLX5_I2C_ADDR_LOW;
*page_num = mlx5_qsfp_eeprom_page(*offset);
*offset -= mlx5_qsfp_eeprom_high_page_offset(*page_num);
}
static void mlx5_sfp_eeprom_params_set(u16 *i2c_addr, int *page_num, u16 *offset)
{
*i2c_addr = MLX5_I2C_ADDR_LOW;
*page_num = 0;
if (*offset < MLX5_EEPROM_PAGE_LENGTH)
return;
*i2c_addr = MLX5_I2C_ADDR_HIGH;
*offset -= MLX5_EEPROM_PAGE_LENGTH;
}
int mlx5_query_module_eeprom(struct mlx5_core_dev *dev,
u16 offset, u16 size, u8 *data)
{
int module_num, page_num, status, err;
int module_num, status, err, page_num = 0;
u32 in[MLX5_ST_SZ_DW(mcia_reg)] = {};
u32 out[MLX5_ST_SZ_DW(mcia_reg)];
u32 in[MLX5_ST_SZ_DW(mcia_reg)];
u16 i2c_addr;
void *ptr = MLX5_ADDR_OF(mcia_reg, out, dword_0);
u16 i2c_addr = 0;
u8 module_id;
void *ptr;
err = mlx5_query_module_num(dev, &module_num);
if (err)
return err;
memset(in, 0, sizeof(in));
size = min_t(int, size, MLX5_EEPROM_MAX_BYTES);
err = mlx5_query_module_id(dev, module_num, &module_id);
if (err)
return err;
/* Get the page number related to the given offset */
page_num = mlx5_eeprom_page(offset);
/* Set the right offset according to the page number,
* For page_num > 0, relative offset is always >= 128 (high page).
*/
offset -= mlx5_eeprom_high_page_offset(page_num);
switch (module_id) {
case MLX5_MODULE_ID_SFP:
mlx5_sfp_eeprom_params_set(&i2c_addr, &page_num, &offset);
break;
case MLX5_MODULE_ID_QSFP:
case MLX5_MODULE_ID_QSFP_PLUS:
case MLX5_MODULE_ID_QSFP28:
mlx5_qsfp_eeprom_params_set(&i2c_addr, &page_num, &offset);
break;
default:
mlx5_core_err(dev, "Module ID not recognized: 0x%x\n", module_id);
return -EINVAL;
}
if (offset + size > MLX5_EEPROM_PAGE_LENGTH)
/* Cross pages read, read until offset 256 in low page */
size -= offset + size - MLX5_EEPROM_PAGE_LENGTH;
i2c_addr = MLX5_I2C_ADDR_LOW;
size = min_t(int, size, MLX5_EEPROM_MAX_BYTES);
MLX5_SET(mcia_reg, in, l, 0);
MLX5_SET(mcia_reg, in, module, module_num);
@ -365,6 +425,7 @@ int mlx5_query_module_eeprom(struct mlx5_core_dev *dev,
return -EIO;
}
ptr = MLX5_ADDR_OF(mcia_reg, out, dword_0);
memcpy(data, ptr, size);
return size;