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Message-ID: <20190430203926.19284-8-saeedm@mellanox.com>
Date: Tue, 30 Apr 2019 20:39:58 +0000
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Erez Alfasi <ereza@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 07/15] net/mlx5e: ethtool, Add support for EEPROM high
pages query
From: Erez Alfasi <ereza@...lanox.com>
Add the support to read additional EEPROM information from high pages.
Information for modules such as SFF-8436 and SFF-8636:
1) Application select table
2) User writable EEPROM
3) Thresholds and alarms
Signed-off-by: Erez Alfasi <ereza@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
.../ethernet/mellanox/mlx5/core/en_ethtool.c | 8 ++--
.../net/ethernet/mellanox/mlx5/core/port.c | 40 ++++++++++++++++---
include/linux/mlx5/port.h | 1 +
3 files changed, 39 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 78dc8fe2a83c..7efaa58ae034 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1561,7 +1561,7 @@ static int mlx5e_get_module_info(struct net_device *netdev,
struct mlx5e_priv *priv = netdev_priv(netdev);
struct mlx5_core_dev *dev = priv->mdev;
int size_read = 0;
- u8 data[4];
+ u8 data[4] = {0};
size_read = mlx5_query_module_eeprom(dev, 0, 2, data);
if (size_read < 2)
@@ -1571,17 +1571,17 @@ static int mlx5e_get_module_info(struct net_device *netdev,
switch (data[0]) {
case MLX5_MODULE_ID_QSFP:
modinfo->type = ETH_MODULE_SFF_8436;
- modinfo->eeprom_len = ETH_MODULE_SFF_8436_LEN;
+ modinfo->eeprom_len = ETH_MODULE_SFF_8436_MAX_LEN;
break;
case MLX5_MODULE_ID_QSFP_PLUS:
case MLX5_MODULE_ID_QSFP28:
/* data[1] = revision id */
if (data[0] == MLX5_MODULE_ID_QSFP28 || data[1] >= 0x3) {
modinfo->type = ETH_MODULE_SFF_8636;
- modinfo->eeprom_len = ETH_MODULE_SFF_8636_LEN;
+ modinfo->eeprom_len = ETH_MODULE_SFF_8636_MAX_LEN;
} else {
modinfo->type = ETH_MODULE_SFF_8436;
- modinfo->eeprom_len = ETH_MODULE_SFF_8436_LEN;
+ modinfo->eeprom_len = ETH_MODULE_SFF_8436_MAX_LEN;
}
break;
case MLX5_MODULE_ID_SFP:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index 361468e0435d..cc262b30aed5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
@@ -293,15 +293,36 @@ static int mlx5_query_module_num(struct mlx5_core_dev *dev, int *module_num)
return 0;
}
+static int mlx5_eeprom_page(int offset)
+{
+ if (offset < MLX5_EEPROM_PAGE_LENGTH)
+ /* Addresses between 0-255 - page 00 */
+ return 0;
+
+ /* Addresses between 256 - 639 belongs to pages 01, 02 and 03
+ * For example, offset = 400 belongs to page 02:
+ * 1 + ((400 - 256)/128) = 2
+ */
+ return 1 + ((offset - MLX5_EEPROM_PAGE_LENGTH) /
+ MLX5_EEPROM_HIGH_PAGE_LENGTH);
+}
+
+static int mlx5_eeprom_high_page_offset(int page_num)
+{
+ if (!page_num) /* Page 0 always start from low page */
+ return 0;
+
+ /* High page */
+ return page_num * MLX5_EEPROM_HIGH_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;
u32 out[MLX5_ST_SZ_DW(mcia_reg)];
u32 in[MLX5_ST_SZ_DW(mcia_reg)];
- int module_num;
u16 i2c_addr;
- int status;
- int err;
void *ptr = MLX5_ADDR_OF(mcia_reg, out, dword_0);
err = mlx5_query_module_num(dev, &module_num);
@@ -311,8 +332,15 @@ int mlx5_query_module_eeprom(struct mlx5_core_dev *dev,
memset(in, 0, sizeof(in));
size = min_t(int, size, MLX5_EEPROM_MAX_BYTES);
- if (offset < MLX5_EEPROM_PAGE_LENGTH &&
- offset + size > MLX5_EEPROM_PAGE_LENGTH)
+ /* 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);
+
+ if (offset + size > MLX5_EEPROM_PAGE_LENGTH)
/* Cross pages read, read until offset 256 in low page */
size -= offset + size - MLX5_EEPROM_PAGE_LENGTH;
@@ -321,7 +349,7 @@ int mlx5_query_module_eeprom(struct mlx5_core_dev *dev,
MLX5_SET(mcia_reg, in, l, 0);
MLX5_SET(mcia_reg, in, module, module_num);
MLX5_SET(mcia_reg, in, i2c_device_address, i2c_addr);
- MLX5_SET(mcia_reg, in, page_number, 0);
+ MLX5_SET(mcia_reg, in, page_number, page_num);
MLX5_SET(mcia_reg, in, device_address, offset);
MLX5_SET(mcia_reg, in, size, size);
diff --git a/include/linux/mlx5/port.h b/include/linux/mlx5/port.h
index 64e78394fc9c..de9a272c9f3d 100644
--- a/include/linux/mlx5/port.h
+++ b/include/linux/mlx5/port.h
@@ -60,6 +60,7 @@ enum mlx5_an_status {
#define MLX5_I2C_ADDR_LOW 0x50
#define MLX5_I2C_ADDR_HIGH 0x51
#define MLX5_EEPROM_PAGE_LENGTH 256
+#define MLX5_EEPROM_HIGH_PAGE_LENGTH 128
enum mlx5e_link_mode {
MLX5E_1000BASE_CX_SGMII = 0,
--
2.20.1
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