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linux-next/include/linux/ethtool.h
Ben Hutchings 6e201c857b ethtool: Document the general convention for VLAs in kernel space 
Various ethtool command structures are declared with zero-length array
at the end which are intended to be variable-length in userland
(relying on lack of compiler bounds checking).  However, in the kernel
the structure and array are always allocated and passed to driver
operations separately.  Make that explicit.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-12 17:33:03 -05:00

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/*
* ethtool.h: Defines for Linux ethtool.
*
* Copyright (C) 1998 David S. Miller (davem@redhat.com)
* Copyright 2001 Jeff Garzik <jgarzik@pobox.com>
* Portions Copyright 2001 Sun Microsystems (thockin@sun.com)
* Portions Copyright 2002 Intel (eli.kupermann@intel.com,
* christopher.leech@intel.com,
* scott.feldman@intel.com)
* Portions Copyright (C) Sun Microsystems 2008
*/
#ifndef _LINUX_ETHTOOL_H
#define _LINUX_ETHTOOL_H
#include <linux/compat.h>
#include <uapi/linux/ethtool.h>
#ifdef CONFIG_COMPAT
struct compat_ethtool_rx_flow_spec {
u32 flow_type;
union ethtool_flow_union h_u;
struct ethtool_flow_ext h_ext;
union ethtool_flow_union m_u;
struct ethtool_flow_ext m_ext;
compat_u64 ring_cookie;
u32 location;
};
struct compat_ethtool_rxnfc {
u32 cmd;
u32 flow_type;
compat_u64 data;
struct compat_ethtool_rx_flow_spec fs;
u32 rule_cnt;
u32 rule_locs[0];
};
#endif /* CONFIG_COMPAT */
#include <linux/rculist.h>
extern int __ethtool_get_settings(struct net_device *dev,
struct ethtool_cmd *cmd);
/**
* enum ethtool_phys_id_state - indicator state for physical identification
* @ETHTOOL_ID_INACTIVE: Physical ID indicator should be deactivated
* @ETHTOOL_ID_ACTIVE: Physical ID indicator should be activated
* @ETHTOOL_ID_ON: LED should be turned on (used iff %ETHTOOL_ID_ACTIVE
* is not supported)
* @ETHTOOL_ID_OFF: LED should be turned off (used iff %ETHTOOL_ID_ACTIVE
* is not supported)
*/
enum ethtool_phys_id_state {
ETHTOOL_ID_INACTIVE,
ETHTOOL_ID_ACTIVE,
ETHTOOL_ID_ON,
ETHTOOL_ID_OFF
};
struct net_device;
/* Some generic methods drivers may use in their ethtool_ops */
u32 ethtool_op_get_link(struct net_device *dev);
int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *eti);
/**
* ethtool_rxfh_indir_default - get default value for RX flow hash indirection
* @index: Index in RX flow hash indirection table
* @n_rx_rings: Number of RX rings to use
*
* This function provides the default policy for RX flow hash indirection.
*/
static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
{
return index % n_rx_rings;
}
/**
* struct ethtool_ops - optional netdev operations
* @get_settings: Get various device settings including Ethernet link
* settings. The @cmd parameter is expected to have been cleared
* before get_settings is called. Returns a negative error code or
* zero.
* @set_settings: Set various device settings including Ethernet link
* settings. Returns a negative error code or zero.
* @get_drvinfo: Report driver/device information. Should only set the
* @driver, @version, @fw_version and @bus_info fields. If not
* implemented, the @driver and @bus_info fields will be filled in
* according to the netdev's parent device.
* @get_regs_len: Get buffer length required for @get_regs
* @get_regs: Get device registers
* @get_wol: Report whether Wake-on-Lan is enabled
* @set_wol: Turn Wake-on-Lan on or off. Returns a negative error code
* or zero.
* @get_msglevel: Report driver message level. This should be the value
* of the @msg_enable field used by netif logging functions.
* @set_msglevel: Set driver message level
* @nway_reset: Restart autonegotiation. Returns a negative error code
* or zero.
* @get_link: Report whether physical link is up. Will only be called if
* the netdev is up. Should usually be set to ethtool_op_get_link(),
* which uses netif_carrier_ok().
* @get_eeprom: Read data from the device EEPROM.
* Should fill in the magic field. Don't need to check len for zero
* or wraparound. Fill in the data argument with the eeprom values
* from offset to offset + len. Update len to the amount read.
* Returns an error or zero.
* @set_eeprom: Write data to the device EEPROM.
* Should validate the magic field. Don't need to check len for zero
* or wraparound. Update len to the amount written. Returns an error
* or zero.
* @get_coalesce: Get interrupt coalescing parameters. Returns a negative
* error code or zero.
* @set_coalesce: Set interrupt coalescing parameters. Returns a negative
* error code or zero.
* @get_ringparam: Report ring sizes
* @set_ringparam: Set ring sizes. Returns a negative error code or zero.
* @get_pauseparam: Report pause parameters
* @set_pauseparam: Set pause parameters. Returns a negative error code
* or zero.
* @self_test: Run specified self-tests
* @get_strings: Return a set of strings that describe the requested objects
* @set_phys_id: Identify the physical devices, e.g. by flashing an LED
* attached to it. The implementation may update the indicator
* asynchronously or synchronously, but in either case it must return
* quickly. It is initially called with the argument %ETHTOOL_ID_ACTIVE,
* and must either activate asynchronous updates and return zero, return
* a negative error or return a positive frequency for synchronous
* indication (e.g. 1 for one on/off cycle per second). If it returns
* a frequency then it will be called again at intervals with the
* argument %ETHTOOL_ID_ON or %ETHTOOL_ID_OFF and should set the state of
* the indicator accordingly. Finally, it is called with the argument
* %ETHTOOL_ID_INACTIVE and must deactivate the indicator. Returns a
* negative error code or zero.
* @get_ethtool_stats: Return extended statistics about the device.
* This is only useful if the device maintains statistics not
* included in &struct rtnl_link_stats64.
* @begin: Function to be called before any other operation. Returns a
* negative error code or zero.
* @complete: Function to be called after any other operation except
* @begin. Will be called even if the other operation failed.
* @get_priv_flags: Report driver-specific feature flags.
* @set_priv_flags: Set driver-specific feature flags. Returns a negative
* error code or zero.
* @get_sset_count: Get number of strings that @get_strings will write.
* @get_rxnfc: Get RX flow classification rules. Returns a negative
* error code or zero.
* @set_rxnfc: Set RX flow classification rules. Returns a negative
* error code or zero.
* @flash_device: Write a firmware image to device's flash memory.
* Returns a negative error code or zero.
* @reset: Reset (part of) the device, as specified by a bitmask of
* flags from &enum ethtool_reset_flags. Returns a negative
* error code or zero.
* @get_rxfh_indir_size: Get the size of the RX flow hash indirection table.
* Returns zero if not supported for this specific device.
* @get_rxfh_indir: Get the contents of the RX flow hash indirection table.
* Will not be called if @get_rxfh_indir_size returns zero.
* Returns a negative error code or zero.
* @set_rxfh_indir: Set the contents of the RX flow hash indirection table.
* Will not be called if @get_rxfh_indir_size returns zero.
* Returns a negative error code or zero.
* @get_channels: Get number of channels.
* @set_channels: Set number of channels. Returns a negative error code or
* zero.
* @get_dump_flag: Get dump flag indicating current dump length, version,
* and flag of the device.
* @get_dump_data: Get dump data.
* @set_dump: Set dump specific flags to the device.
* @get_ts_info: Get the time stamping and PTP hardware clock capabilities.
* Drivers supporting transmit time stamps in software should set this to
* ethtool_op_get_ts_info().
* @get_module_info: Get the size and type of the eeprom contained within
* a plug-in module.
* @get_module_eeprom: Get the eeprom information from the plug-in module
* @get_eee: Get Energy-Efficient (EEE) supported and status.
* @set_eee: Set EEE status (enable/disable) as well as LPI timers.
*
* All operations are optional (i.e. the function pointer may be set
* to %NULL) and callers must take this into account. Callers must
* hold the RTNL lock.
*
* See the structures used by these operations for further documentation.
* Note that for all operations using a structure ending with a zero-
* length array, the array is allocated separately in the kernel and
* is passed to the driver as an additional parameter.
*
* See &struct net_device and &struct net_device_ops for documentation
* of the generic netdev features interface.
*/
struct ethtool_ops {
int (*get_settings)(struct net_device *, struct ethtool_cmd *);
int (*set_settings)(struct net_device *, struct ethtool_cmd *);
void (*get_drvinfo)(struct net_device *, struct ethtool_drvinfo *);
int (*get_regs_len)(struct net_device *);
void (*get_regs)(struct net_device *, struct ethtool_regs *, void *);
void (*get_wol)(struct net_device *, struct ethtool_wolinfo *);
int (*set_wol)(struct net_device *, struct ethtool_wolinfo *);
u32 (*get_msglevel)(struct net_device *);
void (*set_msglevel)(struct net_device *, u32);
int (*nway_reset)(struct net_device *);
u32 (*get_link)(struct net_device *);
int (*get_eeprom_len)(struct net_device *);
int (*get_eeprom)(struct net_device *,
struct ethtool_eeprom *, u8 *);
int (*set_eeprom)(struct net_device *,
struct ethtool_eeprom *, u8 *);
int (*get_coalesce)(struct net_device *, struct ethtool_coalesce *);
int (*set_coalesce)(struct net_device *, struct ethtool_coalesce *);
void (*get_ringparam)(struct net_device *,
struct ethtool_ringparam *);
int (*set_ringparam)(struct net_device *,
struct ethtool_ringparam *);
void (*get_pauseparam)(struct net_device *,
struct ethtool_pauseparam*);
int (*set_pauseparam)(struct net_device *,
struct ethtool_pauseparam*);
void (*self_test)(struct net_device *, struct ethtool_test *, u64 *);
void (*get_strings)(struct net_device *, u32 stringset, u8 *);
int (*set_phys_id)(struct net_device *, enum ethtool_phys_id_state);
void (*get_ethtool_stats)(struct net_device *,
struct ethtool_stats *, u64 *);
int (*begin)(struct net_device *);
void (*complete)(struct net_device *);
u32 (*get_priv_flags)(struct net_device *);
int (*set_priv_flags)(struct net_device *, u32);
int (*get_sset_count)(struct net_device *, int);
int (*get_rxnfc)(struct net_device *,
struct ethtool_rxnfc *, u32 *rule_locs);
int (*set_rxnfc)(struct net_device *, struct ethtool_rxnfc *);
int (*flash_device)(struct net_device *, struct ethtool_flash *);
int (*reset)(struct net_device *, u32 *);
u32 (*get_rxfh_indir_size)(struct net_device *);
int (*get_rxfh_indir)(struct net_device *, u32 *);
int (*set_rxfh_indir)(struct net_device *, const u32 *);
void (*get_channels)(struct net_device *, struct ethtool_channels *);
int (*set_channels)(struct net_device *, struct ethtool_channels *);
int (*get_dump_flag)(struct net_device *, struct ethtool_dump *);
int (*get_dump_data)(struct net_device *,
struct ethtool_dump *, void *);
int (*set_dump)(struct net_device *, struct ethtool_dump *);
int (*get_ts_info)(struct net_device *, struct ethtool_ts_info *);
int (*get_module_info)(struct net_device *,
struct ethtool_modinfo *);
int (*get_module_eeprom)(struct net_device *,
struct ethtool_eeprom *, u8 *);
int (*get_eee)(struct net_device *, struct ethtool_eee *);
int (*set_eee)(struct net_device *, struct ethtool_eee *);
};
#endif /* _LINUX_ETHTOOL_H */
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