netdev - [PATCH net-next v5 3/5] net: phylink: allow attaching phy for SFP modules on 802.3z mode

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Date:   Thu, 14 Jan 2021 05:43:29 +0100
From:   Marek Behún <kabel@...nel.org>
To:     netdev@...r.kernel.org
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        davem@...emloft.net, pali@...nel.org,
        Marek Behún <kabel@...nel.org>
Subject: [PATCH net-next v5 3/5] net: phylink: allow attaching phy for SFP modules on 802.3z mode

Some SFPs may contain an internal PHY which may in some cases want to
connect with the host interface in 1000base-x/2500base-x mode.
Do not fail if such PHY is being attached in one of these PHY interface
modes.

Signed-off-by: Marek Behún <kabel@...nel.org>
Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>
Reviewed-by: Pali Rohár <pali@...nel.org>
Cc: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/phy/phylink.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 84f6e197f965..f97d041f82f4 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1018,7 +1018,7 @@ static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
 {
 	if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
 		    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
-		     phy_interface_mode_is_8023z(interface))))
+		     phy_interface_mode_is_8023z(interface) && !pl->sfp_bus)))
 		return -EINVAL;
 
 	if (pl->phydev)
@@ -2069,9 +2069,6 @@ static int phylink_sfp_config(struct phylink *pl, u8 mode,
 		    phylink_an_mode_str(mode), phy_modes(config.interface),
 		    __ETHTOOL_LINK_MODE_MASK_NBITS, support);
 
-	if (phy_interface_mode_is_8023z(iface) && pl->phydev)
-		return -EINVAL;
-
 	changed = !linkmode_equal(pl->supported, support);
 	if (changed) {
 		linkmode_copy(pl->supported, support);
-- 
2.26.2