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net: phylink: add function to resolve clause 73 negotiation

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Add a function to resolve clause 73 negotiation according to the
priority resolution function described in clause 73.3.6.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2023-05-23 11:15:58 +01:00 committed by Jakub Kicinski
parent dc7a51411e
commit dad987484e
2 changed files with 41 additions and 0 deletions
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39
drivers/net/phy/phylink.c
View file

@ -3212,6 +3212,45 @@ static const struct sfp_upstream_ops sfp_phylink_ops = {
/* Helpers for MAC drivers */
static struct {
int bit;
int speed;
} phylink_c73_priority_resolution[] = {
{ ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT, SPEED_100000 },
{ ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT, SPEED_100000 },
/* 100GBASE-KP4 and 100GBASE-CR10 not supported */
{ ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT, SPEED_40000 },
{ ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT, SPEED_40000 },
{ ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, SPEED_10000 },
{ ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, SPEED_10000 },
/* 5GBASE-KR not supported */
{ ETHTOOL_LINK_MODE_2500baseX_Full_BIT, SPEED_2500 },
{ ETHTOOL_LINK_MODE_1000baseKX_Full_BIT, SPEED_1000 },
};
void phylink_resolve_c73(struct phylink_link_state *state)
{
int i;
for (i = 0; i < ARRAY_SIZE(phylink_c73_priority_resolution); i++) {
int bit = phylink_c73_priority_resolution[i].bit;
if (linkmode_test_bit(bit, state->advertising) &&
linkmode_test_bit(bit, state->lp_advertising))
break;
}
if (i < ARRAY_SIZE(phylink_c73_priority_resolution)) {
state->speed = phylink_c73_priority_resolution[i].speed;
state->duplex = DUPLEX_FULL;
} else {
/* negotiation failure */
state->link = false;
}
phylink_resolve_an_pause(state);
}
EXPORT_SYMBOL_GPL(phylink_resolve_c73);
static void phylink_decode_c37_word(struct phylink_link_state *state,
uint16_t config_reg, int speed)
{

2
include/linux/phylink.h
View file

@ -656,6 +656,8 @@ int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
const unsigned long *advertising);
void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
void phylink_resolve_c73(struct phylink_link_state *state);
void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
struct phylink_link_state *state);