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net: phylink: clarify flow control settings in documentation 

Clarify the expected flow control settings operation in the phylink
documentation for each negotiation mode.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: hongrongxuan <hongrongxuan@huawei.com>
This commit is contained in:
Russell King 2020-02-15 15:50:09 +00:00 committed by Jianping Liu
parent 202442fe4e
commit 9a6a9df235
1 changed files with 18 additions and 8 deletions
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26
include/linux/phylink.h
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@ -149,13 +149,20 @@ int mac_link_state(struct phylink_config *config,
* guaranteed to be correct, and so any mac_config() implementation must
* never reference these fields.
*
* In all negotiation modes, as defined by @mode, @state->pause indicates the
* pause settings which should be applied as follows. If %MLO_PAUSE_AN is not
* set, %MLO_PAUSE_TX and %MLO_PAUSE_RX indicate whether the MAC should send
* pause frames and/or act on received pause frames respectively. Otherwise,
* the results of in-band negotiation/status from the MAC PCS should be used
* to control the MAC pause mode settings.
*
* The action performed depends on the currently selected mode:
*
* %MLO_AN_FIXED, %MLO_AN_PHY:
* Configure the specified @state->speed, @state->duplex and
* @state->pause (%MLO_PAUSE_TX / %MLO_PAUSE_RX) modes over a link
* specified by @state->interface. @state->advertising may be used,
* but is not required. Other members of @state must be ignored.
* Configure the specified @state->speed and @state->duplex over a link
* specified by @state->interface. @state->advertising may be used, but
* is not required. Pause modes as above. Other members of @state must
* be ignored.
*
* Valid state members: interface, speed, duplex, pause, advertising.
*
@ -167,11 +174,14 @@ int mac_link_state(struct phylink_config *config,
* mac_link_state() callback. Changes in link state must be made
* by calling phylink_mac_change().
*
* Interface mode specific details are mentioned below.
*
* If in 802.3z mode, the link speed is fixed, dependent on the
* @state->interface. Duplex is negotiated, and pause is advertised
* according to @state->an_enabled, @state->pause and
* @state->advertising flags. Beware of MACs which only support full
* duplex at gigabit and higher speeds.
* @state->interface. Duplex and pause modes are negotiated via
* the in-band configuration word. Advertised pause modes are set
* according to the @state->an_enabled and @state->advertising
* flags. Beware of MACs which only support full duplex at gigabit
* and higher speeds.
*
* If in Cisco SGMII mode, the link speed and duplex mode are passed
* in the serial bitstream 16-bit configuration word, and the MAC