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ethtool: Expand documentation of struct ethtool_cmd
struct ethtool_cmd has very limited documentation; it contains several obscure or obsolete fields and several with non-obvious interpretation. Replace the inline comments (and some others below) with a full explanation of the semantics as well as I understand them, in kernel-doc format. Formally deprecate some fields that seem to be of historical use only. Extend the comment about 32/64-bit compatibility to cover all ethtool structures. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
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Ben Hutchings
David S. Miller
parent
738b52bb98
commit
bf8fc60a62
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@ -16,37 +16,97 @@
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#include <linux/types.h>
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#include <linux/if_ether.h>
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/* This should work for both 32 and 64 bit userland. */
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/* All structures exposed to userland should be defined such that they
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* have the same layout for 32-bit and 64-bit userland.
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*/
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/**
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* struct ethtool_cmd - link control and status
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* @cmd: Command number = %ETHTOOL_GSET or %ETHTOOL_SSET
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* @supported: Bitmask of %SUPPORTED_* flags for the link modes,
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* physical connectors and other link features for which the
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* interface supports autonegotiation or auto-detection.
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* Read-only.
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* @advertising: Bitmask of %ADVERTISED_* flags for the link modes,
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* physical connectors and other link features that are
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* advertised through autonegotiation or enabled for
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* auto-detection.
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* @speed: Low bits of the speed
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* @duplex: Duplex mode; one of %DUPLEX_*
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* @port: Physical connector type; one of %PORT_*
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* @phy_address: MDIO address of PHY (transceiver); 0 or 255 if not
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* applicable. For clause 45 PHYs this is the PRTAD.
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* @transceiver: Historically used to distinguish different possible
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* PHY types, but not in a consistent way. Deprecated.
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* @autoneg: Enable/disable autonegotiation and auto-detection;
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* either %AUTONEG_DISABLE or %AUTONEG_ENABLE
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* @mdio_support: Bitmask of %ETH_MDIO_SUPPORTS_* flags for the MDIO
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* protocols supported by the interface; 0 if unknown.
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* Read-only.
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* @maxtxpkt: Historically used to report TX IRQ coalescing; now
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* obsoleted by &struct ethtool_coalesce. Read-only; deprecated.
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* @maxrxpkt: Historically used to report RX IRQ coalescing; now
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* obsoleted by &struct ethtool_coalesce. Read-only; deprecated.
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* @speed_hi: High bits of the speed
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* @eth_tp_mdix: Ethernet twisted-pair MDI(-X) status; one of
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* %ETH_TP_MDI_*. If the status is unknown or not applicable, the
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* value will be %ETH_TP_MDI_INVALID. Read-only.
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* @eth_tp_mdix_ctrl: Ethernet twisted pair MDI(-X) control; one of
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* %ETH_TP_MDI_*. If MDI(-X) control is not implemented, reads
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* yield %ETH_TP_MDI_INVALID and writes may be ignored or rejected.
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* When written successfully, the link should be renegotiated if
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* necessary.
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* @lp_advertising: Bitmask of %ADVERTISED_* flags for the link modes
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* and other link features that the link partner advertised
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* through autonegotiation; 0 if unknown or not applicable.
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* Read-only.
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*
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* The link speed in Mbps is split between @speed and @speed_hi. Use
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* the ethtool_cmd_speed() and ethtool_cmd_speed_set() functions to
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* access it.
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*
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* If autonegotiation is disabled, the speed and @duplex represent the
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* fixed link mode and are writable if the driver supports multiple
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* link modes. If it is enabled then they are read-only; if the link
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* is up they represent the negotiated link mode; if the link is down,
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* the speed is 0, %SPEED_UNKNOWN or the highest enabled speed and
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* @duplex is %DUPLEX_UNKNOWN or the best enabled duplex mode.
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*
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* Some hardware interfaces may have multiple PHYs and/or physical
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* connectors fitted or do not allow the driver to detect which are
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* fitted. For these interfaces @port and/or @phy_address may be
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* writable, possibly dependent on @autoneg being %AUTONEG_DISABLE.
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* Otherwise, attempts to write different values may be ignored or
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* rejected.
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*
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* Users should assume that all fields not marked read-only are
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* writable and subject to validation by the driver. They should use
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* %ETHTOOL_GSET to get the current values before making specific
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* changes and then applying them with %ETHTOOL_SSET.
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*
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* Drivers that implement set_settings() should validate all fields
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* other than @cmd that are not described as read-only or deprecated,
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* and must ignore all fields described as read-only.
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*
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* Deprecated fields should be ignored by both users and drivers.
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*/
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struct ethtool_cmd {
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__u32 cmd;
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__u32 supported; /* Features this interface supports */
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__u32 advertising; /* Features this interface advertises */
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__u16 speed; /* The forced speed (lower bits) in
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* Mbps. Please use
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* ethtool_cmd_speed()/_set() to
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* access it */
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__u8 duplex; /* Duplex, half or full */
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__u8 port; /* Which connector port */
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__u8 phy_address; /* MDIO PHY address (PRTAD for clause 45).
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* May be read-only or read-write
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* depending on the driver.
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*/
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__u8 transceiver; /* Which transceiver to use */
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__u8 autoneg; /* Enable or disable autonegotiation */
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__u8 mdio_support; /* MDIO protocols supported. Read-only.
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* Not set by all drivers.
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*/
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__u32 maxtxpkt; /* Tx pkts before generating tx int */
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__u32 maxrxpkt; /* Rx pkts before generating rx int */
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__u16 speed_hi; /* The forced speed (upper
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* bits) in Mbps. Please use
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* ethtool_cmd_speed()/_set() to
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* access it */
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__u8 eth_tp_mdix; /* twisted pair MDI-X status */
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__u8 eth_tp_mdix_ctrl; /* twisted pair MDI-X control, when set,
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* link should be renegotiated if necessary
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*/
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__u32 lp_advertising; /* Features the link partner advertises */
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__u32 supported;
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__u32 advertising;
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__u16 speed;
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__u8 duplex;
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__u8 port;
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__u8 phy_address;
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__u8 transceiver;
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__u8 autoneg;
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__u8 mdio_support;
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__u32 maxtxpkt;
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__u32 maxrxpkt;
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__u16 speed_hi;
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__u8 eth_tp_mdix;
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__u8 eth_tp_mdix_ctrl;
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__u32 lp_advertising;
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__u32 reserved[2];
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};
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@ -905,7 +965,6 @@ enum ethtool_sfeatures_retval_bits {
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#define SPARC_ETH_GSET ETHTOOL_GSET
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#define SPARC_ETH_SSET ETHTOOL_SSET
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/* Indicates what features are supported by the interface. */
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#define SUPPORTED_10baseT_Half (1 << 0)
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#define SUPPORTED_10baseT_Full (1 << 1)
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#define SUPPORTED_100baseT_Half (1 << 2)
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@ -934,7 +993,6 @@ enum ethtool_sfeatures_retval_bits {
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#define SUPPORTED_40000baseSR4_Full (1 << 25)
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#define SUPPORTED_40000baseLR4_Full (1 << 26)
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/* Indicates what features are advertised by the interface. */
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#define ADVERTISED_10baseT_Half (1 << 0)
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#define ADVERTISED_10baseT_Full (1 << 1)
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#define ADVERTISED_100baseT_Half (1 << 2)
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@ -999,9 +1057,7 @@ enum ethtool_sfeatures_retval_bits {
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#define XCVR_DUMMY2 0x03
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#define XCVR_DUMMY3 0x04
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/* Enable or disable autonegotiation. If this is set to enable,
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* the forced link modes above are completely ignored.
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*/
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/* Enable or disable autonegotiation. */
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#define AUTONEG_DISABLE 0x00
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#define AUTONEG_ENABLE 0x01
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