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net: phylink: provide fixed state for 1000base-X and 2500base-X

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When decoding clause 22 state, if in-band is disabled and using either
1000base-X or 2500base-X, rather than reporting link-down, we know the
speed, and we only support full duplex. Pause modes taken from XPCS.

This fixes a problem reported by Eric Woudstra.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/E1tXGei-000EtL-Fn@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2025-01-13 09:22:44 +00:00 committed by Jakub Kicinski
parent 60a331fff5
commit e432ffc14b
1 changed files with 19 additions and 10 deletions
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29
drivers/net/phy/phylink.c
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@ -3882,27 +3882,36 @@ void phylink_mii_c22_pcs_decode_state(struct phylink_link_state *state,
if (!state->link)
return;
/* If in-band is disabled, then the advertisement data is not
* meaningful.
*/
if (neg_mode != PHYLINK_PCS_NEG_INBAND_ENABLED)
return;
switch (state->interface) {
case PHY_INTERFACE_MODE_1000BASEX:
phylink_decode_c37_word(state, lpa, SPEED_1000);
if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED) {
phylink_decode_c37_word(state, lpa, SPEED_1000);
} else {
state->speed = SPEED_1000;
state->duplex = DUPLEX_FULL;
state->pause |= MLO_PAUSE_TX | MLO_PAUSE_RX;
}
break;
case PHY_INTERFACE_MODE_2500BASEX:
phylink_decode_c37_word(state, lpa, SPEED_2500);
if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED) {
phylink_decode_c37_word(state, lpa, SPEED_2500);
} else {
state->speed = SPEED_2500;
state->duplex = DUPLEX_FULL;
state->pause |= MLO_PAUSE_TX | MLO_PAUSE_RX;
}
break;
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
phylink_decode_sgmii_word(state, lpa);
if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED)
phylink_decode_sgmii_word(state, lpa);
break;
case PHY_INTERFACE_MODE_QUSGMII:
phylink_decode_usgmii_word(state, lpa);
if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED)
phylink_decode_usgmii_word(state, lpa);
break;
default: