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ethtool: Allow network drivers to dump arbitrary EEPROM data

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Define get_module_eeprom_by_page() ethtool callback and implement
netlink infrastructure.

get_module_eeprom_by_page() allows network drivers to dump a part of
module's EEPROM specified by page and bank numbers along with offset and
length. It is effectively a netlink replacement for get_module_info()
and get_module_eeprom() pair, which is needed due to emergence of
complex non-linear EEPROM layouts.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladyslav Tarasiuk
2021-04-09 11:06:34 +03:00
committed by David S. Miller
parent cbd3125392
commit c781ff12a2
7 changed files with 270 additions and 4 deletions
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33
include/linux/ethtool.h
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@@ -81,6 +81,7 @@ enum {
#define ETH_RSS_HASH_NO_CHANGE 0
struct net_device;
struct netlink_ext_ack;
/* Some generic methods drivers may use in their ethtool_ops */
u32 ethtool_op_get_link(struct net_device *dev);
@@ -262,6 +263,31 @@ struct ethtool_pause_stats {
u64 rx_pause_frames;
};
#define ETH_MODULE_EEPROM_PAGE_LEN 128
#define ETH_MODULE_MAX_I2C_ADDRESS 0x7f
/**
* struct ethtool_module_eeprom - EEPROM dump from specified page
* @offset: Offset within the specified EEPROM page to begin read, in bytes.
* @length: Number of bytes to read.
* @page: Page number to read from.
* @bank: Page bank number to read from, if applicable by EEPROM spec.
* @i2c_address: I2C address of a page. Value less than 0x7f expected. Most
* EEPROMs use 0x50 or 0x51.
* @data: Pointer to buffer with EEPROM data of @length size.
*
* This can be used to manage pages during EEPROM dump in ethtool and pass
* required information to the driver.
*/
struct ethtool_module_eeprom {
__u32 offset;
__u32 length;
__u8 page;
__u8 bank;
__u8 i2c_address;
__u8 *data;
};
/**
* struct ethtool_ops - optional netdev operations
* @cap_link_lanes_supported: indicates if the driver supports lanes
@@ -414,6 +440,9 @@ struct ethtool_pause_stats {
* cannot use the standard PHY library helpers.
* @get_phy_tunable: Read the value of a PHY tunable.
* @set_phy_tunable: Set the value of a PHY tunable.
* @get_module_eeprom_by_page: Get a region of plug-in module EEPROM data from
* specified page. Returns a negative error code or the amount of bytes
* read.
*
* All operations are optional (i.e. the function pointer may be set
* to %NULL) and callers must take this into account. Callers must
@@ -519,6 +548,9 @@ struct ethtool_ops {
const struct ethtool_tunable *, void *);
int (*set_phy_tunable)(struct net_device *,
const struct ethtool_tunable *, const void *);
int (*get_module_eeprom_by_page)(struct net_device *dev,
const struct ethtool_module_eeprom *page,
struct netlink_ext_ack *extack);
};
int ethtool_check_ops(const struct ethtool_ops *ops);
@@ -542,7 +574,6 @@ int ethtool_virtdev_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd,
u32 *dev_speed, u8 *dev_duplex);
struct netlink_ext_ack;
struct phy_device;
struct phy_tdr_config;