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Message-Id: <20210621075041.2502416-4-idosch@idosch.org>
Date: Mon, 21 Jun 2021 10:50:41 +0300
From: Ido Schimmel <idosch@...sch.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
vadimp@...dia.com, mlxsw@...dia.com,
Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 3/3] mlxsw: core: Add support for module EEPROM read by page
From: Ido Schimmel <idosch@...dia.com>
Add support for ethtool_ops::get_module_eeprom_by_page() which allows
user space to read transceiver module EEPROM based on passed parameters.
The I2C address is not validated in order to avoid module-specific code.
In case of wrong address, error will be returned from device's firmware.
Tested by comparing output with legacy method (ioctl) output.
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Tested-by: Vadim Pasternak <vadimp@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
.../net/ethernet/mellanox/mlxsw/core_env.c | 74 +++++++++++++++++++
.../net/ethernet/mellanox/mlxsw/core_env.h | 7 ++
drivers/net/ethernet/mellanox/mlxsw/minimal.c | 13 ++++
.../mellanox/mlxsw/spectrum_ethtool.c | 14 ++++
4 files changed, 108 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.c b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
index b3ca5bd33a7f..4a0dbdb6730b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_env.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
@@ -3,6 +3,7 @@
#include <linux/kernel.h>
#include <linux/err.h>
+#include <linux/ethtool.h>
#include <linux/sfp.h>
#include "core.h"
@@ -315,6 +316,79 @@ int mlxsw_env_get_module_eeprom(struct net_device *netdev,
}
EXPORT_SYMBOL(mlxsw_env_get_module_eeprom);
+static int mlxsw_env_mcia_status_process(const char *mcia_pl,
+ struct netlink_ext_ack *extack)
+{
+ u8 status = mlxsw_reg_mcia_status_get(mcia_pl);
+
+ switch (status) {
+ case MLXSW_REG_MCIA_STATUS_GOOD:
+ return 0;
+ case MLXSW_REG_MCIA_STATUS_NO_EEPROM_MODULE:
+ NL_SET_ERR_MSG_MOD(extack, "No response from module's EEPROM");
+ return -EIO;
+ case MLXSW_REG_MCIA_STATUS_MODULE_NOT_SUPPORTED:
+ NL_SET_ERR_MSG_MOD(extack, "Module type not supported by the device");
+ return -EOPNOTSUPP;
+ case MLXSW_REG_MCIA_STATUS_MODULE_NOT_CONNECTED:
+ NL_SET_ERR_MSG_MOD(extack, "No module present indication");
+ return -EIO;
+ case MLXSW_REG_MCIA_STATUS_I2C_ERROR:
+ NL_SET_ERR_MSG_MOD(extack, "Error occurred while trying to access module's EEPROM using I2C");
+ return -EIO;
+ case MLXSW_REG_MCIA_STATUS_MODULE_DISABLED:
+ NL_SET_ERR_MSG_MOD(extack, "Module is disabled");
+ return -EIO;
+ default:
+ NL_SET_ERR_MSG_MOD(extack, "Unknown error");
+ return -EIO;
+ }
+}
+
+int
+mlxsw_env_get_module_eeprom_by_page(struct mlxsw_core *mlxsw_core, u8 module,
+ const struct ethtool_module_eeprom *page,
+ struct netlink_ext_ack *extack)
+{
+ u32 bytes_read = 0;
+ u16 device_addr;
+
+ /* Offset cannot be larger than 2 * ETH_MODULE_EEPROM_PAGE_LEN */
+ device_addr = page->offset;
+
+ while (bytes_read < page->length) {
+ char eeprom_tmp[MLXSW_REG_MCIA_EEPROM_SIZE];
+ char mcia_pl[MLXSW_REG_MCIA_LEN];
+ u8 size;
+ int err;
+
+ size = min_t(u8, page->length - bytes_read,
+ MLXSW_REG_MCIA_EEPROM_SIZE);
+
+ mlxsw_reg_mcia_pack(mcia_pl, module, 0, page->page,
+ device_addr + bytes_read, size,
+ page->i2c_address);
+ mlxsw_reg_mcia_bank_number_set(mcia_pl, page->bank);
+
+ err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mcia), mcia_pl);
+ if (err) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to access module's EEPROM");
+ return err;
+ }
+
+ err = mlxsw_env_mcia_status_process(mcia_pl, extack);
+ if (err)
+ return err;
+
+ mlxsw_reg_mcia_eeprom_memcpy_from(mcia_pl, eeprom_tmp);
+ memcpy(page->data + bytes_read, eeprom_tmp, size);
+ bytes_read += size;
+ }
+
+ return bytes_read;
+}
+EXPORT_SYMBOL(mlxsw_env_get_module_eeprom_by_page);
+
static int mlxsw_env_module_has_temp_sensor(struct mlxsw_core *mlxsw_core,
u8 module,
bool *p_has_temp_sensor)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.h b/drivers/net/ethernet/mellanox/mlxsw/core_env.h
index 2b23f8a87862..0bf5bd0f8a7e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_env.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.h
@@ -4,6 +4,8 @@
#ifndef _MLXSW_CORE_ENV_H
#define _MLXSW_CORE_ENV_H
+#include <linux/ethtool.h>
+
struct ethtool_modinfo;
struct ethtool_eeprom;
@@ -17,6 +19,11 @@ int mlxsw_env_get_module_eeprom(struct net_device *netdev,
struct mlxsw_core *mlxsw_core, int module,
struct ethtool_eeprom *ee, u8 *data);
+int
+mlxsw_env_get_module_eeprom_by_page(struct mlxsw_core *mlxsw_core, u8 module,
+ const struct ethtool_module_eeprom *page,
+ struct netlink_ext_ack *extack);
+
int
mlxsw_env_module_overheat_counter_get(struct mlxsw_core *mlxsw_core, u8 module,
u64 *p_counter);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/minimal.c b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
index 68102726c6a7..d9d56c44e994 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/minimal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
@@ -112,10 +112,23 @@ mlxsw_m_get_module_eeprom(struct net_device *netdev, struct ethtool_eeprom *ee,
ee, data);
}
+static int
+mlxsw_m_get_module_eeprom_by_page(struct net_device *netdev,
+ const struct ethtool_module_eeprom *page,
+ struct netlink_ext_ack *extack)
+{
+ struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
+ struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
+
+ return mlxsw_env_get_module_eeprom_by_page(core, mlxsw_m_port->module,
+ page, extack);
+}
+
static const struct ethtool_ops mlxsw_m_port_ethtool_ops = {
.get_drvinfo = mlxsw_m_module_get_drvinfo,
.get_module_info = mlxsw_m_get_module_info,
.get_module_eeprom = mlxsw_m_get_module_eeprom,
+ .get_module_eeprom_by_page = mlxsw_m_get_module_eeprom_by_page,
};
static int
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c
index c8061beed6db..267590a0eee7 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c
@@ -1050,6 +1050,19 @@ static int mlxsw_sp_get_module_eeprom(struct net_device *netdev,
return err;
}
+static int
+mlxsw_sp_get_module_eeprom_by_page(struct net_device *dev,
+ const struct ethtool_module_eeprom *page,
+ struct netlink_ext_ack *extack)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ u8 module = mlxsw_sp_port->mapping.module;
+
+ return mlxsw_env_get_module_eeprom_by_page(mlxsw_sp->core, module, page,
+ extack);
+}
+
static int
mlxsw_sp_get_ts_info(struct net_device *netdev, struct ethtool_ts_info *info)
{
@@ -1199,6 +1212,7 @@ const struct ethtool_ops mlxsw_sp_port_ethtool_ops = {
.set_link_ksettings = mlxsw_sp_port_set_link_ksettings,
.get_module_info = mlxsw_sp_get_module_info,
.get_module_eeprom = mlxsw_sp_get_module_eeprom,
+ .get_module_eeprom_by_page = mlxsw_sp_get_module_eeprom_by_page,
.get_ts_info = mlxsw_sp_get_ts_info,
.get_eth_phy_stats = mlxsw_sp_get_eth_phy_stats,
.get_eth_mac_stats = mlxsw_sp_get_eth_mac_stats,
--
2.31.1
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