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net: phylink: provide phylink_get_inband_type()

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Provide a function to get the type of the inband signalling used for
a PHY interface type. This will be used in the subsequent patch to
address problems with 10G optical modules.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/E1uslws-00000001SP5-1R2R@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2025-08-31 18:34:38 +01:00 committed by Jakub Kicinski
parent 4beb44a2d6
commit 1bd905dfea
1 changed files with 44 additions and 35 deletions
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79
drivers/net/phy/phylink.c
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@ -1016,6 +1016,42 @@ static void phylink_pcs_an_restart(struct phylink *pl)
pl->pcs->ops->pcs_an_restart(pl->pcs);
}
enum inband_type {
INBAND_NONE,
INBAND_CISCO_SGMII,
INBAND_BASEX,
};
static enum inband_type phylink_get_inband_type(phy_interface_t interface)
{
switch (interface) {
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
case PHY_INTERFACE_MODE_QUSGMII:
case PHY_INTERFACE_MODE_USXGMII:
case PHY_INTERFACE_MODE_10G_QXGMII:
/* These protocols are designed for use with a PHY which
* communicates its negotiation result back to the MAC via
* inband communication. Note: there exist PHYs that run
* with SGMII but do not send the inband data.
*/
return INBAND_CISCO_SGMII;
case PHY_INTERFACE_MODE_1000BASEX:
case PHY_INTERFACE_MODE_2500BASEX:
/* 1000base-X is designed for use media-side for Fibre
* connections, and thus the Autoneg bit needs to be
* taken into account. We also do this for 2500base-X
* as well, but drivers may not support this, so may
* need to override this.
*/
return INBAND_BASEX;
default:
return INBAND_NONE;
}
}
/**
* phylink_pcs_neg_mode() - helper to determine PCS inband mode
* @pl: a pointer to a &struct phylink returned from phylink_create()
@ -1043,46 +1079,19 @@ static void phylink_pcs_neg_mode(struct phylink *pl, struct phylink_pcs *pcs,
unsigned int pcs_ib_caps = 0;
unsigned int phy_ib_caps = 0;
unsigned int neg_mode, mode;
enum {
INBAND_CISCO_SGMII,
INBAND_BASEX,
} type;
enum inband_type type;
type = phylink_get_inband_type(interface);
if (type == INBAND_NONE) {
pl->pcs_neg_mode = PHYLINK_PCS_NEG_NONE;
pl->act_link_an_mode = pl->req_link_an_mode;
return;
}
mode = pl->req_link_an_mode;
pl->phy_ib_mode = 0;
switch (interface) {
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
case PHY_INTERFACE_MODE_QUSGMII:
case PHY_INTERFACE_MODE_USXGMII:
case PHY_INTERFACE_MODE_10G_QXGMII:
/* These protocols are designed for use with a PHY which
* communicates its negotiation result back to the MAC via
* inband communication. Note: there exist PHYs that run
* with SGMII but do not send the inband data.
*/
type = INBAND_CISCO_SGMII;
break;
case PHY_INTERFACE_MODE_1000BASEX:
case PHY_INTERFACE_MODE_2500BASEX:
/* 1000base-X is designed for use media-side for Fibre
* connections, and thus the Autoneg bit needs to be
* taken into account. We also do this for 2500base-X
* as well, but drivers may not support this, so may
* need to override this.
*/
type = INBAND_BASEX;
break;
default:
pl->pcs_neg_mode = PHYLINK_PCS_NEG_NONE;
pl->act_link_an_mode = mode;
return;
}
if (pcs)
pcs_ib_caps = phylink_pcs_inband_caps(pcs, interface);