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net: ethtool: add new ETHTOOL_xLINKSETTINGS API

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This patch defines a new ETHTOOL_GLINKSETTINGS/SLINKSETTINGS API,
handled by the new get_link_ksettings/set_link_ksettings callbacks.
This API provides support for most legacy ethtool_cmd fields, adds
support for larger link mode masks (up to 4064 bits, variable length),
and removes ethtool_cmd deprecated
fields (transceiver/maxrxpkt/maxtxpkt).

This API is deprecating the legacy ETHTOOL_GSET/SSET API and provides
the following backward compatibility properties:
 - legacy ethtool with legacy drivers: no change, still using the
   get_settings/set_settings callbacks.
 - legacy ethtool with new get/set_link_ksettings drivers: the new
   driver callbacks are used, data internally converted to legacy
   ethtool_cmd. ETHTOOL_GSET will return only the 1st 32b of each link
   mode mask. ETHTOOL_SSET will fail if user tries to set the
   ethtool_cmd deprecated fields to
   non-0 (transceiver/maxrxpkt/maxtxpkt). A kernel warning is logged if
   driver sets higher bits.
 - future ethtool with legacy drivers: no change, still using the
   get_settings/set_settings callbacks, internally converted to new data
   structure. Deprecated fields (transceiver/maxrxpkt/maxtxpkt) will be
   ignored and seen as 0 from user space. Note that that "future"
   ethtool tool will not allow changes to these deprecated fields.
 - future ethtool with new drivers: direct call to the new callbacks.

By "future" ethtool, what is meant is:
 - query: first try ETHTOOL_GLINKSETTINGS, and revert to ETHTOOL_GSET if
   fails
 - set: query first and remember which of ETHTOOL_GLINKSETTINGS or
   ETHTOOL_GSET was successful
   + if ETHTOOL_GLINKSETTINGS was successful, then change config with
     ETHTOOL_SLINKSETTINGS. A failure there is final (do not try
     ETHTOOL_SSET).
   + otherwise ETHTOOL_GSET was successful, change config with
     ETHTOOL_SSET. A failure there is final (do not try
     ETHTOOL_SLINKSETTINGS).

The interaction user/kernel via the new API requires a small
ETHTOOL_GLINKSETTINGS handshake first to agree on the length of the link
mode bitmaps. If kernel doesn't agree with user, it returns the bitmap
length it is expecting from user as a negative length (and cmd field is
0). When kernel and user agree, kernel returns valid info in all
fields (ie. link mode length > 0 and cmd is ETHTOOL_GLINKSETTINGS).

Data structure crossing user/kernel boundary is 32/64-bit
agnostic. Converted internally to a legal kernel bitmap.

The internal __ethtool_get_settings kernel helper will gradually be
replaced by __ethtool_get_link_ksettings by the time the first
"link_settings" drivers start to appear. So this patch doesn't change
it, it will be removed before it needs to be changed.

Signed-off-by: David Decotigny <decot@googlers.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Decotigny 2016-02-24 10:57:59 -08:00 committed by David S. Miller
parent 48133335d7
commit 3f1ac7a700
3 changed files with 785 additions and 79 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

91
include/linux/ethtool.h
View file

@ -12,6 +12,7 @@
#ifndef _LINUX_ETHTOOL_H #ifndef _LINUX_ETHTOOL_H
#define _LINUX_ETHTOOL_H #define _LINUX_ETHTOOL_H
#include <linux/bitmap.h>
#include <linux/compat.h> #include <linux/compat.h>
#include <uapi/linux/ethtool.h> #include <uapi/linux/ethtool.h>
@ -40,9 +41,6 @@ struct compat_ethtool_rxnfc {
#include <linux/rculist.h> #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 * enum ethtool_phys_id_state - indicator state for physical identification
* @ETHTOOL_ID_INACTIVE: Physical ID indicator should be deactivated * @ETHTOOL_ID_INACTIVE: Physical ID indicator should be deactivated
@ -97,13 +95,74 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
return index % n_rx_rings; return index % n_rx_rings;
} }
/* number of link mode bits/ulongs handled internally by kernel */
#define __ETHTOOL_LINK_MODE_MASK_NBITS \
(__ETHTOOL_LINK_MODE_LAST + 1)
/* declare a link mode bitmap */
#define __ETHTOOL_DECLARE_LINK_MODE_MASK(name) \
DECLARE_BITMAP(name, __ETHTOOL_LINK_MODE_MASK_NBITS)
/* drivers must ignore base.cmd and base.link_mode_masks_nwords
* fields, but they are allowed to overwrite them (will be ignored).
*/
struct ethtool_link_ksettings {
struct ethtool_link_settings base;
struct {
__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
__ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising);
} link_modes;
};
/**
* ethtool_link_ksettings_zero_link_mode - clear link_ksettings link mode mask
* @ptr : pointer to struct ethtool_link_ksettings
* @name : one of supported/advertising/lp_advertising
*/
#define ethtool_link_ksettings_zero_link_mode(ptr, name) \
bitmap_zero((ptr)->link_modes.name, __ETHTOOL_LINK_MODE_MASK_NBITS)
/**
* ethtool_link_ksettings_add_link_mode - set bit in link_ksettings
* link mode mask
* @ptr : pointer to struct ethtool_link_ksettings
* @name : one of supported/advertising/lp_advertising
* @mode : one of the ETHTOOL_LINK_MODE_*_BIT
* (not atomic, no bound checking)
*/
#define ethtool_link_ksettings_add_link_mode(ptr, name, mode) \
__set_bit(ETHTOOL_LINK_MODE_ ## mode ## _BIT, (ptr)->link_modes.name)
/**
* ethtool_link_ksettings_test_link_mode - test bit in ksettings link mode mask
* @ptr : pointer to struct ethtool_link_ksettings
* @name : one of supported/advertising/lp_advertising
* @mode : one of the ETHTOOL_LINK_MODE_*_BIT
* (not atomic, no bound checking)
*
* Returns true/false.
*/
#define ethtool_link_ksettings_test_link_mode(ptr, name, mode) \
test_bit(ETHTOOL_LINK_MODE_ ## mode ## _BIT, (ptr)->link_modes.name)
extern int
__ethtool_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *link_ksettings);
/* DEPRECATED, use __ethtool_get_link_ksettings */
extern int __ethtool_get_settings(struct net_device *dev,
struct ethtool_cmd *cmd);
/** /**
* struct ethtool_ops - optional netdev operations * struct ethtool_ops - optional netdev operations
* @get_settings: Get various device settings including Ethernet link * @get_settings: DEPRECATED, use %get_link_ksettings/%set_link_ksettings
* API. Get various device settings including Ethernet link
* settings. The @cmd parameter is expected to have been cleared * settings. The @cmd parameter is expected to have been cleared
* before get_settings is called. Returns a negative error code or * before get_settings is called. Returns a negative error code
* zero. * or zero.
* @set_settings: Set various device settings including Ethernet link * @set_settings: DEPRECATED, use %get_link_ksettings/%set_link_ksettings
* API. Set various device settings including Ethernet link
* settings. Returns a negative error code or zero. * settings. Returns a negative error code or zero.
* @get_drvinfo: Report driver/device information. Should only set the * @get_drvinfo: Report driver/device information. Should only set the
* @driver, @version, @fw_version and @bus_info fields. If not * @driver, @version, @fw_version and @bus_info fields. If not
@ -211,6 +270,19 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
* a TX queue has this number, return -EINVAL. If only a RX queue or a TX * a TX queue has this number, return -EINVAL. If only a RX queue or a TX
* queue has this number, ignore the inapplicable fields. * queue has this number, ignore the inapplicable fields.
* Returns a negative error code or zero. * Returns a negative error code or zero.
* @get_link_ksettings: When defined, takes precedence over the
* %get_settings method. Get various device settings
* including Ethernet link settings. The %cmd and
* %link_mode_masks_nwords fields should be ignored (use
* %__ETHTOOL_LINK_MODE_MASK_NBITS instead of the latter), any
* change to them will be overwritten by kernel. Returns a
* negative error code or zero.
* @set_link_ksettings: When defined, takes precedence over the
* %set_settings method. Set various device settings including
* Ethernet link settings. The %cmd and %link_mode_masks_nwords
* fields should be ignored (use %__ETHTOOL_LINK_MODE_MASK_NBITS
* instead of the latter), any change to them will be overwritten
* by kernel. Returns a negative error code or zero.
* *
* All operations are optional (i.e. the function pointer may be set * All operations are optional (i.e. the function pointer may be set
* to %NULL) and callers must take this into account. Callers must * to %NULL) and callers must take this into account. Callers must
@ -293,6 +365,9 @@ struct ethtool_ops {
struct ethtool_coalesce *); struct ethtool_coalesce *);
int (*set_per_queue_coalesce)(struct net_device *, u32, int (*set_per_queue_coalesce)(struct net_device *, u32,
struct ethtool_coalesce *); struct ethtool_coalesce *);
int (*get_link_ksettings)(struct net_device *,
struct ethtool_link_ksettings *);
int (*set_link_ksettings)(struct net_device *,
const struct ethtool_link_ksettings *);
}; };
#endif /* _LINUX_ETHTOOL_H */ #endif /* _LINUX_ETHTOOL_H */

320
include/uapi/linux/ethtool.h
View file

@ -21,7 +21,8 @@
*/ */
/** /**
* struct ethtool_cmd - link control and status * struct ethtool_cmd - DEPRECATED, link control and status
* This structure is DEPRECATED, please use struct ethtool_link_settings.
* @cmd: Command number = %ETHTOOL_GSET or %ETHTOOL_SSET * @cmd: Command number = %ETHTOOL_GSET or %ETHTOOL_SSET
* @supported: Bitmask of %SUPPORTED_* flags for the link modes, * @supported: Bitmask of %SUPPORTED_* flags for the link modes,
* physical connectors and other link features for which the * physical connectors and other link features for which the
@ -1219,8 +1220,12 @@ struct ethtool_per_queue_op {
}; };
/* CMDs currently supported */ /* CMDs currently supported */
#define ETHTOOL_GSET 0x00000001 /* Get settings. */ #define ETHTOOL_GSET 0x00000001 /* DEPRECATED, Get settings.
#define ETHTOOL_SSET 0x00000002 /* Set settings. */ * Please use ETHTOOL_GLINKSETTINGS
*/
#define ETHTOOL_SSET 0x00000002 /* DEPRECATED, Set settings.
* Please use ETHTOOL_SLINKSETTINGS
*/
#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */ #define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
#define ETHTOOL_GREGS 0x00000004 /* Get NIC registers. */ #define ETHTOOL_GREGS 0x00000004 /* Get NIC registers. */
#define ETHTOOL_GWOL 0x00000005 /* Get wake-on-lan options. */ #define ETHTOOL_GWOL 0x00000005 /* Get wake-on-lan options. */
@ -1302,73 +1307,139 @@ struct ethtool_per_queue_op {
#define ETHTOOL_PERQUEUE 0x0000004b /* Set per queue options */ #define ETHTOOL_PERQUEUE 0x0000004b /* Set per queue options */
#define ETHTOOL_GLINKSETTINGS 0x0000004c /* Get ethtool_link_settings */
#define ETHTOOL_SLINKSETTINGS 0x0000004d /* Set ethtool_link_settings */
/* compatibility with older code */ /* compatibility with older code */
#define SPARC_ETH_GSET ETHTOOL_GSET #define SPARC_ETH_GSET ETHTOOL_GSET
#define SPARC_ETH_SSET ETHTOOL_SSET #define SPARC_ETH_SSET ETHTOOL_SSET
#define SUPPORTED_10baseT_Half (1 << 0) /* Link mode bit indices */
#define SUPPORTED_10baseT_Full (1 << 1) enum ethtool_link_mode_bit_indices {
#define SUPPORTED_100baseT_Half (1 << 2) ETHTOOL_LINK_MODE_10baseT_Half_BIT = 0,
#define SUPPORTED_100baseT_Full (1 << 3) ETHTOOL_LINK_MODE_10baseT_Full_BIT = 1,
#define SUPPORTED_1000baseT_Half (1 << 4) ETHTOOL_LINK_MODE_100baseT_Half_BIT = 2,
#define SUPPORTED_1000baseT_Full (1 << 5) ETHTOOL_LINK_MODE_100baseT_Full_BIT = 3,
#define SUPPORTED_Autoneg (1 << 6) ETHTOOL_LINK_MODE_1000baseT_Half_BIT = 4,
#define SUPPORTED_TP (1 << 7) ETHTOOL_LINK_MODE_1000baseT_Full_BIT = 5,
#define SUPPORTED_AUI (1 << 8) ETHTOOL_LINK_MODE_Autoneg_BIT = 6,
#define SUPPORTED_MII (1 << 9) ETHTOOL_LINK_MODE_TP_BIT = 7,
#define SUPPORTED_FIBRE (1 << 10) ETHTOOL_LINK_MODE_AUI_BIT = 8,
#define SUPPORTED_BNC (1 << 11) ETHTOOL_LINK_MODE_MII_BIT = 9,
#define SUPPORTED_10000baseT_Full (1 << 12) ETHTOOL_LINK_MODE_FIBRE_BIT = 10,
#define SUPPORTED_Pause (1 << 13) ETHTOOL_LINK_MODE_BNC_BIT = 11,
#define SUPPORTED_Asym_Pause (1 << 14) ETHTOOL_LINK_MODE_10000baseT_Full_BIT = 12,
#define SUPPORTED_2500baseX_Full (1 << 15) ETHTOOL_LINK_MODE_Pause_BIT = 13,
#define SUPPORTED_Backplane (1 << 16) ETHTOOL_LINK_MODE_Asym_Pause_BIT = 14,
#define SUPPORTED_1000baseKX_Full (1 << 17) ETHTOOL_LINK_MODE_2500baseX_Full_BIT = 15,
#define SUPPORTED_10000baseKX4_Full (1 << 18) ETHTOOL_LINK_MODE_Backplane_BIT = 16,
#define SUPPORTED_10000baseKR_Full (1 << 19) ETHTOOL_LINK_MODE_1000baseKX_Full_BIT = 17,
#define SUPPORTED_10000baseR_FEC (1 << 20) ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT = 18,
#define SUPPORTED_20000baseMLD2_Full (1 << 21) ETHTOOL_LINK_MODE_10000baseKR_Full_BIT = 19,
#define SUPPORTED_20000baseKR2_Full (1 << 22) ETHTOOL_LINK_MODE_10000baseR_FEC_BIT = 20,
#define SUPPORTED_40000baseKR4_Full (1 << 23) ETHTOOL_LINK_MODE_20000baseMLD2_Full_BIT = 21,
#define SUPPORTED_40000baseCR4_Full (1 << 24) ETHTOOL_LINK_MODE_20000baseKR2_Full_BIT = 22,
#define SUPPORTED_40000baseSR4_Full (1 << 25) ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT = 23,
#define SUPPORTED_40000baseLR4_Full (1 << 26) ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT = 24,
#define SUPPORTED_56000baseKR4_Full (1 << 27) ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT = 25,
#define SUPPORTED_56000baseCR4_Full (1 << 28) ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT = 26,
#define SUPPORTED_56000baseSR4_Full (1 << 29) ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT = 27,
#define SUPPORTED_56000baseLR4_Full (1 << 30) ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT = 28,
ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT = 29,
ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT = 30,
#define ADVERTISED_10baseT_Half (1 << 0) /* Last allowed bit for __ETHTOOL_LINK_MODE_LEGACY_MASK is bit
#define ADVERTISED_10baseT_Full (1 << 1) * 31. Please do NOT define any SUPPORTED_* or ADVERTISED_*
#define ADVERTISED_100baseT_Half (1 << 2) * macro for bits > 31. The only way to use indices > 31 is to
#define ADVERTISED_100baseT_Full (1 << 3) * use the new ETHTOOL_GLINKSETTINGS/ETHTOOL_SLINKSETTINGS API.
#define ADVERTISED_1000baseT_Half (1 << 4) */
#define ADVERTISED_1000baseT_Full (1 << 5)
#define ADVERTISED_Autoneg (1 << 6) __ETHTOOL_LINK_MODE_LAST
#define ADVERTISED_TP (1 << 7) = ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT,
#define ADVERTISED_AUI (1 << 8) };
#define ADVERTISED_MII (1 << 9)
#define ADVERTISED_FIBRE (1 << 10) #define __ETHTOOL_LINK_MODE_LEGACY_MASK(base_name) \
#define ADVERTISED_BNC (1 << 11) (1UL << (ETHTOOL_LINK_MODE_ ## base_name ## _BIT))
#define ADVERTISED_10000baseT_Full (1 << 12)
#define ADVERTISED_Pause (1 << 13) /* DEPRECATED macros. Please migrate to
#define ADVERTISED_Asym_Pause (1 << 14) * ETHTOOL_GLINKSETTINGS/ETHTOOL_SLINKSETTINGS API. Please do NOT
#define ADVERTISED_2500baseX_Full (1 << 15) * define any new SUPPORTED_* macro for bits > 31.
#define ADVERTISED_Backplane (1 << 16) */
#define ADVERTISED_1000baseKX_Full (1 << 17) #define SUPPORTED_10baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(10baseT_Half)
#define ADVERTISED_10000baseKX4_Full (1 << 18) #define SUPPORTED_10baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10baseT_Full)
#define ADVERTISED_10000baseKR_Full (1 << 19) #define SUPPORTED_100baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(100baseT_Half)
#define ADVERTISED_10000baseR_FEC (1 << 20) #define SUPPORTED_100baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(100baseT_Full)
#define ADVERTISED_20000baseMLD2_Full (1 << 21) #define SUPPORTED_1000baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseT_Half)
#define ADVERTISED_20000baseKR2_Full (1 << 22) #define SUPPORTED_1000baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseT_Full)
#define ADVERTISED_40000baseKR4_Full (1 << 23) #define SUPPORTED_Autoneg __ETHTOOL_LINK_MODE_LEGACY_MASK(Autoneg)
#define ADVERTISED_40000baseCR4_Full (1 << 24) #define SUPPORTED_TP __ETHTOOL_LINK_MODE_LEGACY_MASK(TP)
#define ADVERTISED_40000baseSR4_Full (1 << 25) #define SUPPORTED_AUI __ETHTOOL_LINK_MODE_LEGACY_MASK(AUI)
#define ADVERTISED_40000baseLR4_Full (1 << 26) #define SUPPORTED_MII __ETHTOOL_LINK_MODE_LEGACY_MASK(MII)
#define ADVERTISED_56000baseKR4_Full (1 << 27) #define SUPPORTED_FIBRE __ETHTOOL_LINK_MODE_LEGACY_MASK(FIBRE)
#define ADVERTISED_56000baseCR4_Full (1 << 28) #define SUPPORTED_BNC __ETHTOOL_LINK_MODE_LEGACY_MASK(BNC)
#define ADVERTISED_56000baseSR4_Full (1 << 29) #define SUPPORTED_10000baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseT_Full)
#define ADVERTISED_56000baseLR4_Full (1 << 30) #define SUPPORTED_Pause __ETHTOOL_LINK_MODE_LEGACY_MASK(Pause)
#define SUPPORTED_Asym_Pause __ETHTOOL_LINK_MODE_LEGACY_MASK(Asym_Pause)
#define SUPPORTED_2500baseX_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(2500baseX_Full)
#define SUPPORTED_Backplane __ETHTOOL_LINK_MODE_LEGACY_MASK(Backplane)
#define SUPPORTED_1000baseKX_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseKX_Full)
#define SUPPORTED_10000baseKX4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseKX4_Full)
#define SUPPORTED_10000baseKR_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseKR_Full)
#define SUPPORTED_10000baseR_FEC __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseR_FEC)
#define SUPPORTED_20000baseMLD2_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(20000baseMLD2_Full)
#define SUPPORTED_20000baseKR2_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(20000baseKR2_Full)
#define SUPPORTED_40000baseKR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseKR4_Full)
#define SUPPORTED_40000baseCR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseCR4_Full)
#define SUPPORTED_40000baseSR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseSR4_Full)
#define SUPPORTED_40000baseLR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseLR4_Full)
#define SUPPORTED_56000baseKR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseKR4_Full)
#define SUPPORTED_56000baseCR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseCR4_Full)
#define SUPPORTED_56000baseSR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseSR4_Full)
#define SUPPORTED_56000baseLR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseLR4_Full)
/* Please do not define any new SUPPORTED_* macro for bits > 31, see
* notice above.
*/
/*
* DEPRECATED macros. Please migrate to
* ETHTOOL_GLINKSETTINGS/ETHTOOL_SLINKSETTINGS API. Please do NOT
* define any new ADERTISE_* macro for bits > 31.
*/
#define ADVERTISED_10baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(10baseT_Half)
#define ADVERTISED_10baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10baseT_Full)
#define ADVERTISED_100baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(100baseT_Half)
#define ADVERTISED_100baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(100baseT_Full)
#define ADVERTISED_1000baseT_Half __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseT_Half)
#define ADVERTISED_1000baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseT_Full)
#define ADVERTISED_Autoneg __ETHTOOL_LINK_MODE_LEGACY_MASK(Autoneg)
#define ADVERTISED_TP __ETHTOOL_LINK_MODE_LEGACY_MASK(TP)
#define ADVERTISED_AUI __ETHTOOL_LINK_MODE_LEGACY_MASK(AUI)
#define ADVERTISED_MII __ETHTOOL_LINK_MODE_LEGACY_MASK(MII)
#define ADVERTISED_FIBRE __ETHTOOL_LINK_MODE_LEGACY_MASK(FIBRE)
#define ADVERTISED_BNC __ETHTOOL_LINK_MODE_LEGACY_MASK(BNC)
#define ADVERTISED_10000baseT_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseT_Full)
#define ADVERTISED_Pause __ETHTOOL_LINK_MODE_LEGACY_MASK(Pause)
#define ADVERTISED_Asym_Pause __ETHTOOL_LINK_MODE_LEGACY_MASK(Asym_Pause)
#define ADVERTISED_2500baseX_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(2500baseX_Full)
#define ADVERTISED_Backplane __ETHTOOL_LINK_MODE_LEGACY_MASK(Backplane)
#define ADVERTISED_1000baseKX_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(1000baseKX_Full)
#define ADVERTISED_10000baseKX4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseKX4_Full)
#define ADVERTISED_10000baseKR_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseKR_Full)
#define ADVERTISED_10000baseR_FEC __ETHTOOL_LINK_MODE_LEGACY_MASK(10000baseR_FEC)
#define ADVERTISED_20000baseMLD2_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(20000baseMLD2_Full)
#define ADVERTISED_20000baseKR2_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(20000baseKR2_Full)
#define ADVERTISED_40000baseKR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseKR4_Full)
#define ADVERTISED_40000baseCR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseCR4_Full)
#define ADVERTISED_40000baseSR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseSR4_Full)
#define ADVERTISED_40000baseLR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(40000baseLR4_Full)
#define ADVERTISED_56000baseKR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseKR4_Full)
#define ADVERTISED_56000baseCR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseCR4_Full)
#define ADVERTISED_56000baseSR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseSR4_Full)
#define ADVERTISED_56000baseLR4_Full __ETHTOOL_LINK_MODE_LEGACY_MASK(56000baseLR4_Full)
/* Please do not define any new ADVERTISED_* macro for bits > 31, see
* notice above.
*/
/* The following are all involved in forcing a particular link /* The following are all involved in forcing a particular link
* mode for the device for setting things. When getting the * mode for the device for setting things. When getting the
@ -1533,4 +1604,123 @@ enum ethtool_reset_flags {
}; };
#define ETH_RESET_SHARED_SHIFT 16 #define ETH_RESET_SHARED_SHIFT 16
/**
* struct ethtool_link_settings - link control and status
*
* IMPORTANT, Backward compatibility notice: When implementing new
* user-space tools, please first try %ETHTOOL_GLINKSETTINGS, and
* if it succeeds use %ETHTOOL_SLINKSETTINGS to change link
* settings; do not use %ETHTOOL_SSET if %ETHTOOL_GLINKSETTINGS
* succeeded: stick to %ETHTOOL_GLINKSETTINGS/%SLINKSETTINGS in
* that case. Conversely, if %ETHTOOL_GLINKSETTINGS fails, use
* %ETHTOOL_GSET to query and %ETHTOOL_SSET to change link
* settings; do not use %ETHTOOL_SLINKSETTINGS if
* %ETHTOOL_GLINKSETTINGS failed: stick to
* %ETHTOOL_GSET/%ETHTOOL_SSET in that case.
*
* @cmd: Command number = %ETHTOOL_GLINKSETTINGS or %ETHTOOL_SLINKSETTINGS
* @speed: Link speed (Mbps)
* @duplex: Duplex mode; one of %DUPLEX_*
* @port: Physical connector type; one of %PORT_*
* @phy_address: MDIO address of PHY (transceiver); 0 or 255 if not
* applicable. For clause 45 PHYs this is the PRTAD.
* @autoneg: Enable/disable autonegotiation and auto-detection;
* either %AUTONEG_DISABLE or %AUTONEG_ENABLE
* @mdio_support: Bitmask of %ETH_MDIO_SUPPORTS_* flags for the MDIO
* protocols supported by the interface; 0 if unknown.
* Read-only.
* @eth_tp_mdix: Ethernet twisted-pair MDI(-X) status; one of
* %ETH_TP_MDI_*. If the status is unknown or not applicable, the
* value will be %ETH_TP_MDI_INVALID. Read-only.
* @eth_tp_mdix_ctrl: Ethernet twisted pair MDI(-X) control; one of
* %ETH_TP_MDI_*. If MDI(-X) control is not implemented, reads
* yield %ETH_TP_MDI_INVALID and writes may be ignored or rejected.
* When written successfully, the link should be renegotiated if
* necessary.
* @link_mode_masks_nwords: Number of 32-bit words for each of the
* supported, advertising, lp_advertising link mode bitmaps. For
* %ETHTOOL_GLINKSETTINGS: on entry, number of words passed by user
* (>= 0); on return, if handshake in progress, negative if
* request size unsupported by kernel: absolute value indicates
* kernel recommended size and cmd field is 0, as well as all the
* other fields; otherwise (handshake completed), strictly
* positive to indicate size used by kernel and cmd field is
* %ETHTOOL_GLINKSETTINGS, all other fields populated by driver. For
* %ETHTOOL_SLINKSETTINGS: must be valid on entry, ie. a positive
* value returned previously by %ETHTOOL_GLINKSETTINGS, otherwise
* refused. For drivers: ignore this field (use kernel's
* __ETHTOOL_LINK_MODE_MASK_NBITS instead), any change to it will
* be overwritten by kernel.
* @supported: Bitmap with each bit meaning given by
* %ethtool_link_mode_bit_indices for the link modes, physical
* connectors and other link features for which the interface
* supports autonegotiation or auto-detection. Read-only.
* @advertising: Bitmap with each bit meaning given by
* %ethtool_link_mode_bit_indices for the link modes, physical
* connectors and other link features that are advertised through
* autonegotiation or enabled for auto-detection.
* @lp_advertising: Bitmap with each bit meaning given by
* %ethtool_link_mode_bit_indices for the link modes, and other
* link features that the link partner advertised through
* autonegotiation; 0 if unknown or not applicable. Read-only.
*
* If autonegotiation is disabled, the speed and @duplex represent the
* fixed link mode and are writable if the driver supports multiple
* link modes. If it is enabled then they are read-only; if the link
* is up they represent the negotiated link mode; if the link is down,
* the speed is 0, %SPEED_UNKNOWN or the highest enabled speed and
* @duplex is %DUPLEX_UNKNOWN or the best enabled duplex mode.
*
* Some hardware interfaces may have multiple PHYs and/or physical
* connectors fitted or do not allow the driver to detect which are
* fitted. For these interfaces @port and/or @phy_address may be
* writable, possibly dependent on @autoneg being %AUTONEG_DISABLE.
* Otherwise, attempts to write different values may be ignored or
* rejected.
*
* Deprecated %ethtool_cmd fields transceiver, maxtxpkt and maxrxpkt
* are not available in %ethtool_link_settings. Until all drivers are
* converted to ignore them or to the new %ethtool_link_settings API,
* for both queries and changes, users should always try
* %ETHTOOL_GLINKSETTINGS first, and if it fails with -ENOTSUPP stick
* only to %ETHTOOL_GSET and %ETHTOOL_SSET consistently. If it
* succeeds, then users should stick to %ETHTOOL_GLINKSETTINGS and
* %ETHTOOL_SLINKSETTINGS (which would support drivers implementing
* either %ethtool_cmd or %ethtool_link_settings).
*
* Users should assume that all fields not marked read-only are
* writable and subject to validation by the driver. They should use
* %ETHTOOL_GLINKSETTINGS to get the current values before making specific
* changes and then applying them with %ETHTOOL_SLINKSETTINGS.
*
* Drivers that implement %get_link_ksettings and/or
* %set_link_ksettings should ignore the @cmd
* and @link_mode_masks_nwords fields (any change to them overwritten
* by kernel), and rely only on kernel's internal
* %__ETHTOOL_LINK_MODE_MASK_NBITS and
* %ethtool_link_mode_mask_t. Drivers that implement
* %set_link_ksettings() should validate all fields other than @cmd
* and @link_mode_masks_nwords that are not described as read-only or
* deprecated, and must ignore all fields described as read-only.
*/
struct ethtool_link_settings {
__u32 cmd;
__u32 speed;
__u8 duplex;
__u8 port;
__u8 phy_address;
__u8 autoneg;
__u8 mdio_support;
__u8 eth_tp_mdix;
__u8 eth_tp_mdix_ctrl;
__s8 link_mode_masks_nwords;
__u32 reserved[8];
__u32 link_mode_masks[0];
/* layout of link_mode_masks fields:
* __u32 map_supported[link_mode_masks_nwords];
* __u32 map_advertising[link_mode_masks_nwords];
* __u32 map_lp_advertising[link_mode_masks_nwords];
*/
};
#endif /* _UAPI_LINUX_ETHTOOL_H */ #endif /* _UAPI_LINUX_ETHTOOL_H */

447
net/core/ethtool.c
View file

@ -387,6 +387,359 @@ static int __ethtool_set_flags(struct net_device *dev, u32 data)
return 0; return 0;
} }
static void convert_legacy_u32_to_link_mode(unsigned long *dst, u32 legacy_u32)
{
bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
dst[0] = legacy_u32;
}
/* return false if src had higher bits set. lower bits always updated. */
static bool convert_link_mode_to_legacy_u32(u32 *legacy_u32,
const unsigned long *src)
{
bool retval = true;
/* TODO: following test will soon always be true */
if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
__ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
bitmap_fill(ext, 32);
bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
if (bitmap_intersects(ext, src,
__ETHTOOL_LINK_MODE_MASK_NBITS)) {
/* src mask goes beyond bit 31 */
retval = false;
}
}
*legacy_u32 = src[0];
return retval;
}
/* return false if legacy contained non-0 deprecated fields
* transceiver/maxtxpkt/maxrxpkt. rest of ksettings always updated
*/
static bool
convert_legacy_settings_to_link_ksettings(
struct ethtool_link_ksettings *link_ksettings,
const struct ethtool_cmd *legacy_settings)
{
bool retval = true;
memset(link_ksettings, 0, sizeof(*link_ksettings));
/* This is used to tell users that driver is still using these
* deprecated legacy fields, and they should not use
* %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
*/
if (legacy_settings->transceiver ||
legacy_settings->maxtxpkt ||
legacy_settings->maxrxpkt)
retval = false;
convert_legacy_u32_to_link_mode(
link_ksettings->link_modes.supported,
legacy_settings->supported);
convert_legacy_u32_to_link_mode(
link_ksettings->link_modes.advertising,
legacy_settings->advertising);
convert_legacy_u32_to_link_mode(
link_ksettings->link_modes.lp_advertising,
legacy_settings->lp_advertising);
link_ksettings->base.speed
= ethtool_cmd_speed(legacy_settings);
link_ksettings->base.duplex
= legacy_settings->duplex;
link_ksettings->base.port
= legacy_settings->port;
link_ksettings->base.phy_address
= legacy_settings->phy_address;
link_ksettings->base.autoneg
= legacy_settings->autoneg;
link_ksettings->base.mdio_support
= legacy_settings->mdio_support;
link_ksettings->base.eth_tp_mdix
= legacy_settings->eth_tp_mdix;
link_ksettings->base.eth_tp_mdix_ctrl
= legacy_settings->eth_tp_mdix_ctrl;
return retval;
}
/* return false if ksettings link modes had higher bits
* set. legacy_settings always updated (best effort)
*/
static bool
convert_link_ksettings_to_legacy_settings(
struct ethtool_cmd *legacy_settings,
const struct ethtool_link_ksettings *link_ksettings)
{
bool retval = true;
memset(legacy_settings, 0, sizeof(*legacy_settings));
/* this also clears the deprecated fields in legacy structure:
* __u8 transceiver;
* __u32 maxtxpkt;
* __u32 maxrxpkt;
*/
retval &= convert_link_mode_to_legacy_u32(
&legacy_settings->supported,
link_ksettings->link_modes.supported);
retval &= convert_link_mode_to_legacy_u32(
&legacy_settings->advertising,
link_ksettings->link_modes.advertising);
retval &= convert_link_mode_to_legacy_u32(
&legacy_settings->lp_advertising,
link_ksettings->link_modes.lp_advertising);
ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
legacy_settings->duplex
= link_ksettings->base.duplex;
legacy_settings->port
= link_ksettings->base.port;
legacy_settings->phy_address
= link_ksettings->base.phy_address;
legacy_settings->autoneg
= link_ksettings->base.autoneg;
legacy_settings->mdio_support
= link_ksettings->base.mdio_support;
legacy_settings->eth_tp_mdix
= link_ksettings->base.eth_tp_mdix;
legacy_settings->eth_tp_mdix_ctrl
= link_ksettings->base.eth_tp_mdix_ctrl;
return retval;
}
/* number of 32-bit words to store the user's link mode bitmaps */
#define __ETHTOOL_LINK_MODE_MASK_NU32 \
DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
/* layout of the struct passed from/to userland */
struct ethtool_link_usettings {
struct ethtool_link_settings base;
struct {
__u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
__u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
__u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
} link_modes;
};
/* Internal kernel helper to query a device ethtool_link_settings.
*
* Backward compatibility note: for compatibility with legacy drivers
* that implement only the ethtool_cmd API, this has to work with both
* drivers implementing get_link_ksettings API and drivers
* implementing get_settings API. When drivers implement get_settings
* and report ethtool_cmd deprecated fields
* (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
* because the resulting struct ethtool_link_settings does not report them.
*/
int __ethtool_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *link_ksettings)
{
int err;
struct ethtool_cmd cmd;
ASSERT_RTNL();
if (dev->ethtool_ops->get_link_ksettings) {
memset(link_ksettings, 0, sizeof(*link_ksettings));
return dev->ethtool_ops->get_link_ksettings(dev,
link_ksettings);
}
/* driver doesn't support %ethtool_link_ksettings API. revert to
* legacy %ethtool_cmd API, unless it's not supported either.
* TODO: remove when ethtool_ops::get_settings disappears internally
*/
err = __ethtool_get_settings(dev, &cmd);
if (err < 0)
return err;
/* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
*/
convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
return err;
}
EXPORT_SYMBOL(__ethtool_get_link_ksettings);
/* convert ethtool_link_usettings in user space to a kernel internal
* ethtool_link_ksettings. return 0 on success, errno on error.
*/
static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
const void __user *from)
{
struct ethtool_link_usettings link_usettings;
if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
return -EFAULT;
memcpy(&to->base, &link_usettings.base, sizeof(to->base));
bitmap_from_u32array(to->link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS,
link_usettings.link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NU32);
bitmap_from_u32array(to->link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS,
link_usettings.link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NU32);
bitmap_from_u32array(to->link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS,
link_usettings.link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NU32);
return 0;
}
/* convert a kernel internal ethtool_link_ksettings to
* ethtool_link_usettings in user space. return 0 on success, errno on
* error.
*/
static int
store_link_ksettings_for_user(void __user *to,
const struct ethtool_link_ksettings *from)
{
struct ethtool_link_usettings link_usettings;
memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
bitmap_to_u32array(link_usettings.link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NU32,
from->link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS);
bitmap_to_u32array(link_usettings.link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NU32,
from->link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS);
bitmap_to_u32array(link_usettings.link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NU32,
from->link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS);
if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
return -EFAULT;
return 0;
}
/* Query device for its ethtool_link_settings.
*
* Backward compatibility note: this function must fail when driver
* does not implement ethtool::get_link_ksettings, even if legacy
* ethtool_ops::get_settings is implemented. This tells new versions
* of ethtool that they should use the legacy API %ETHTOOL_GSET for
* this driver, so that they can correctly access the ethtool_cmd
* deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
* implements ethtool_ops::get_settings anymore.
*/
static int ethtool_get_link_ksettings(struct net_device *dev,
void __user *useraddr)
{
int err = 0;
struct ethtool_link_ksettings link_ksettings;
ASSERT_RTNL();
if (!dev->ethtool_ops->get_link_ksettings)
return -EOPNOTSUPP;
/* handle bitmap nbits handshake */
if (copy_from_user(&link_ksettings.base, useraddr,
sizeof(link_ksettings.base)))
return -EFAULT;
if (__ETHTOOL_LINK_MODE_MASK_NU32
!= link_ksettings.base.link_mode_masks_nwords) {
/* wrong link mode nbits requested */
memset(&link_ksettings, 0, sizeof(link_ksettings));
/* keep cmd field reset to 0 */
/* send back number of words required as negative val */
compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
"need too many bits for link modes!");
link_ksettings.base.link_mode_masks_nwords
= -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
/* copy the base fields back to user, not the link
* mode bitmaps
*/
if (copy_to_user(useraddr, &link_ksettings.base,
sizeof(link_ksettings.base)))
return -EFAULT;
return 0;
}
/* handshake successful: user/kernel agree on
* link_mode_masks_nwords
*/
memset(&link_ksettings, 0, sizeof(link_ksettings));
err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
if (err < 0)
return err;
/* make sure we tell the right values to user */
link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
link_ksettings.base.link_mode_masks_nwords
= __ETHTOOL_LINK_MODE_MASK_NU32;
return store_link_ksettings_for_user(useraddr, &link_ksettings);
}
/* Update device ethtool_link_settings.
*
* Backward compatibility note: this function must fail when driver
* does not implement ethtool::set_link_ksettings, even if legacy
* ethtool_ops::set_settings is implemented. This tells new versions
* of ethtool that they should use the legacy API %ETHTOOL_SSET for
* this driver, so that they can correctly update the ethtool_cmd
* deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
* implements ethtool_ops::get_settings anymore.
*/
static int ethtool_set_link_ksettings(struct net_device *dev,
void __user *useraddr)
{
int err;
struct ethtool_link_ksettings link_ksettings;
ASSERT_RTNL();
if (!dev->ethtool_ops->set_link_ksettings)
return -EOPNOTSUPP;
/* make sure nbits field has expected value */
if (copy_from_user(&link_ksettings.base, useraddr,
sizeof(link_ksettings.base)))
return -EFAULT;
if (__ETHTOOL_LINK_MODE_MASK_NU32
!= link_ksettings.base.link_mode_masks_nwords)
return -EINVAL;
/* copy the whole structure, now that we know it has expected
* format
*/
err = load_link_ksettings_from_user(&link_ksettings, useraddr);
if (err)
return err;
/* re-check nwords field, just in case */
if (__ETHTOOL_LINK_MODE_MASK_NU32
!= link_ksettings.base.link_mode_masks_nwords)
return -EINVAL;
return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
}
/* Internal kernel helper to query a device ethtool_cmd settings.
*
* Note about transition to ethtool_link_settings API: We do not need
* (or want) this function to support "dev" instances that implement
* the ethtool_link_settings API as we will update the drivers calling
* this function to call __ethtool_get_link_ksettings instead, before
* the first drivers implement ethtool_ops::get_link_ksettings.
*
* TODO 1: at least make this function static when no driver is using it
* TODO 2: remove when ethtool_ops::get_settings disappears internally
*/
int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{ {
ASSERT_RTNL(); ASSERT_RTNL();
@ -400,30 +753,112 @@ int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
} }
EXPORT_SYMBOL(__ethtool_get_settings); EXPORT_SYMBOL(__ethtool_get_settings);
static void
warn_incomplete_ethtool_legacy_settings_conversion(const char *details)
{
char name[sizeof(current->comm)];
pr_info_once("warning: `%s' uses legacy ethtool link settings API, %s\n",
get_task_comm(name, current), details);
}
/* Query device for its ethtool_cmd settings.
*
* Backward compatibility note: for compatibility with legacy ethtool,
* this has to work with both drivers implementing get_link_ksettings
* API and drivers implementing get_settings API. When drivers
* implement get_link_ksettings and report higher link mode bits, a
* kernel warning is logged once (with name of 1st driver/device) to
* recommend user to upgrade ethtool, but the command is successful
* (only the lower link mode bits reported back to user).
*/
static int ethtool_get_settings(struct net_device *dev, void __user *useraddr) static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
{ {
int err;
struct ethtool_cmd cmd; struct ethtool_cmd cmd;
ASSERT_RTNL();
if (dev->ethtool_ops->get_link_ksettings) {
/* First, use link_ksettings API if it is supported */
int err;
struct ethtool_link_ksettings link_ksettings;
memset(&link_ksettings, 0, sizeof(link_ksettings));
err = dev->ethtool_ops->get_link_ksettings(dev,
&link_ksettings);
if (err < 0)
return err;
if (!convert_link_ksettings_to_legacy_settings(&cmd,
&link_ksettings))
warn_incomplete_ethtool_legacy_settings_conversion(
"link modes are only partially reported");
/* send a sensible cmd tag back to user */
cmd.cmd = ETHTOOL_GSET;
} else {
int err;
/* TODO: return -EOPNOTSUPP when
* ethtool_ops::get_settings disappears internally
*/
/* driver doesn't support %ethtool_link_ksettings
* API. revert to legacy %ethtool_cmd API, unless it's
* not supported either.
*/
err = __ethtool_get_settings(dev, &cmd); err = __ethtool_get_settings(dev, &cmd);
if (err < 0) if (err < 0)
return err; return err;
}
if (copy_to_user(useraddr, &cmd, sizeof(cmd))) if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
return -EFAULT; return -EFAULT;
return 0; return 0;
} }
/* Update device link settings with given ethtool_cmd.
*
* Backward compatibility note: for compatibility with legacy ethtool,
* this has to work with both drivers implementing set_link_ksettings
* API and drivers implementing set_settings API. When drivers
* implement set_link_ksettings and user's request updates deprecated
* ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
* warning is logged once (with name of 1st driver/device) to
* recommend user to upgrade ethtool, and the request is rejected.
*/
static int ethtool_set_settings(struct net_device *dev, void __user *useraddr) static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
{ {
struct ethtool_cmd cmd; struct ethtool_cmd cmd;
if (!dev->ethtool_ops->set_settings) ASSERT_RTNL();
return -EOPNOTSUPP;
if (copy_from_user(&cmd, useraddr, sizeof(cmd))) if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
return -EFAULT; return -EFAULT;
/* first, try new %ethtool_link_ksettings API. */
if (dev->ethtool_ops->set_link_ksettings) {
struct ethtool_link_ksettings link_ksettings;
if (!convert_legacy_settings_to_link_ksettings(&link_ksettings,
&cmd))
return -EINVAL;
link_ksettings.base.cmd = ETHTOOL_SLINKSETTINGS;
link_ksettings.base.link_mode_masks_nwords
= __ETHTOOL_LINK_MODE_MASK_NU32;
return dev->ethtool_ops->set_link_ksettings(dev,
&link_ksettings);
}
/* legacy %ethtool_cmd API */
/* TODO: return -EOPNOTSUPP when ethtool_ops::get_settings
* disappears internally
*/
if (!dev->ethtool_ops->set_settings)
return -EOPNOTSUPP;
return dev->ethtool_ops->set_settings(dev, &cmd); return dev->ethtool_ops->set_settings(dev, &cmd);
} }
@ -2252,6 +2687,12 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_PERQUEUE: case ETHTOOL_PERQUEUE:
rc = ethtool_set_per_queue(dev, useraddr); rc = ethtool_set_per_queue(dev, useraddr);
break; break;
case ETHTOOL_GLINKSETTINGS:
rc = ethtool_get_link_ksettings(dev, useraddr);
break;
case ETHTOOL_SLINKSETTINGS:
rc = ethtool_set_link_ksettings(dev, useraddr);
break;
default: default:
rc = -EOPNOTSUPP; rc = -EOPNOTSUPP;
} }