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net: phylink: add support for PCS link change notifications

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Add a function, phylink_pcs_change() which can be used by PCs drivers
to notify phylink about changes to the PCS link state.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King (Oracle) 2023-07-13 09:42:17 +01:00 committed by David S. Miller
parent aee6098822
commit 24699cc1ff
2 changed files with 41 additions and 4 deletions
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38
drivers/net/phy/phylink.c
View file

@ -1137,6 +1137,11 @@ static void phylink_major_config(struct phylink *pl, bool restart,
if (pcs_changed) {
phylink_pcs_disable(pl->pcs);
if (pl->pcs)
pl->pcs->phylink = NULL;
pcs->phylink = pl;
pl->pcs = pcs;
}
@ -1991,6 +1996,14 @@ void phylink_disconnect_phy(struct phylink *pl)
}
EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
static void phylink_link_changed(struct phylink *pl, bool up, const char *what)
{
if (!up)
pl->mac_link_dropped = true;
phylink_run_resolve(pl);
phylink_dbg(pl, "%s link %s\n", what, up ? "up" : "down");
}
/**
* phylink_mac_change() - notify phylink of a change in MAC state
* @pl: a pointer to a &struct phylink returned from phylink_create()
@ -2001,13 +2014,30 @@ EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
*/
void phylink_mac_change(struct phylink *pl, bool up)
{
if (!up)
pl->mac_link_dropped = true;
phylink_run_resolve(pl);
phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
phylink_link_changed(pl, up, "mac");
}
EXPORT_SYMBOL_GPL(phylink_mac_change);
/**
* phylink_pcs_change() - notify phylink of a change to PCS link state
* @pcs: pointer to &struct phylink_pcs
* @up: indicates whether the link is currently up.
*
* The PCS driver should call this when the state of its link changes
* (e.g. link failure, new negotiation results, etc.) Note: it should
* not determine "up" by reading the BMSR. If in doubt about the link
* state at interrupt time, then pass true if pcs_get_state() returns
* the latched link-down state, otherwise pass false.
*/
void phylink_pcs_change(struct phylink_pcs *pcs, bool up)
{
struct phylink *pl = pcs->phylink;
if (pl)
phylink_link_changed(pl, up, "pcs");
}
EXPORT_SYMBOL_GPL(phylink_pcs_change);
static irqreturn_t phylink_link_handler(int irq, void *data)
{
struct phylink *pl = data;

7
include/linux/phylink.h
View file

@ -9,6 +9,7 @@ struct device_node;
struct ethtool_cmd;
struct fwnode_handle;
struct net_device;
struct phylink;
enum {
MLO_PAUSE_NONE,
@ -520,14 +521,19 @@ struct phylink_pcs_ops;
/**
* struct phylink_pcs - PHYLINK PCS instance
* @ops: a pointer to the &struct phylink_pcs_ops structure
* @phylink: pointer to &struct phylink_config
* @neg_mode: provide PCS neg mode via "mode" argument
* @poll: poll the PCS for link changes
*
* This structure is designed to be embedded within the PCS private data,
* and will be passed between phylink and the PCS.
*
* The @phylink member is private to phylink and must not be touched by
* the PCS driver.
*/
struct phylink_pcs {
const struct phylink_pcs_ops *ops;
struct phylink *phylink;
bool neg_mode;
bool poll;
};
@ -699,6 +705,7 @@ int phylink_fwnode_phy_connect(struct phylink *pl,
void phylink_disconnect_phy(struct phylink *);
void phylink_mac_change(struct phylink *, bool up);
void phylink_pcs_change(struct phylink_pcs *, bool up);
void phylink_start(struct phylink *);
void phylink_stop(struct phylink *);