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ethtool: Update documentation of struct ethtool_pauseparam 

Convert the inline comments to kernel-doc format.

Explicitly specify that non-zero autoneg is an error if link
autonegotiation is disabled.

Specify that pause capabilities should be advertised dependent on link
autonegotiation, not the autoneg flag here.  There is no way to
opt-out of pause frame autonegotiation, and this improves behaviour
when the link partner is configured to follow pause frame
autonegotiation and our interface is not.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Ben Hutchings 2014-02-12 22:14:28 +00:00 committed by David S. Miller
parent af440a8aed
commit 6a7a1081ce
1 changed files with 23 additions and 13 deletions
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36
include/uapi/linux/ethtool.h
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@ -466,20 +466,30 @@ struct ethtool_channels {
__u32 combined_count;
};
/* for configuring link flow control parameters */
/**
* struct ethtool_pauseparam - Ethernet pause (flow control) parameters
* @cmd: Command number = %ETHTOOL_GPAUSEPARAM or %ETHTOOL_SPAUSEPARAM
* @autoneg: Flag to enable autonegotiation of pause frame use
* @rx_pause: Flag to enable reception of pause frames
* @tx_pause: Flag to enable transmission of pause frames
*
* Drivers should reject a non-zero setting of @autoneg when
* autoneogotiation is disabled (or not supported) for the link.
*
* If the link is autonegotiated, drivers should use
* mii_advertise_flowctrl() or similar code to set the advertised
* pause frame capabilities based on the @rx_pause and @tx_pause flags,
* even if @autoneg is zero. They should also allow the advertised
* pause frame capabilities to be controlled directly through the
* advertising field of &struct ethtool_cmd.
*
* If @autoneg is non-zero, the MAC is configured to send and/or
* receive pause frames according to the result of autonegotiation.
* Otherwise, it is configured directly based on the @rx_pause and
* @tx_pause flags.
*/
struct ethtool_pauseparam {
__u32 cmd; /* ETHTOOL_{G,S}PAUSEPARAM */
/* If the link is being auto-negotiated (via ethtool_cmd.autoneg
* being true) the user may set 'autoneg' here non-zero to have the
* pause parameters be auto-negotiated too. In such a case, the
* {rx,tx}_pause values below determine what capabilities are
* advertised.
*
* If 'autoneg' is zero or the link is not being auto-negotiated,
* then {rx,tx}_pause force the driver to use/not-use pause
* flow control.
*/
__u32 cmd;
__u32 autoneg;
__u32 rx_pause;
__u32 tx_pause;