linux-kernel - [PATCH net-next v2] net: phylink: allow half-duplex modes with RATE_MATCH

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Message-ID: <b157c0c289cfba024039a96e635d037f9d946745.1728617993.git.daniel@makrotopia.org>
Date: Fri, 11 Oct 2024 04:40:39 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2] net: phylink: allow half-duplex modes with
 RATE_MATCH_PAUSE

PHYs performing rate-matching using MAC-side flow-control always
perform duplex-matching as well in case they are supporting
half-duplex modes at all.
No longer remove half-duplex modes from their capabilities.

Suggested-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
v2: Fix Suggested-by: tag

 drivers/net/phy/phylink.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 4309317de3d1..24a3144e870a 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -599,15 +599,8 @@ static unsigned long phylink_get_capabilities(phy_interface_t interface,
 		 * max speed at full duplex.
 		 */
 		if (mac_capabilities &
-		    phylink_cap_from_speed_duplex(max_speed, DUPLEX_FULL)) {
-			/* Although a duplex-matching phy might exist, we
-			 * conservatively remove these modes because the MAC
-			 * will not be aware of the half-duplex nature of the
-			 * link.
-			 */
+		    phylink_cap_from_speed_duplex(max_speed, DUPLEX_FULL))
 			matched_caps = GENMASK(__fls(caps), __fls(MAC_10HD));
-			matched_caps &= ~(MAC_1000HD | MAC_100HD | MAC_10HD);
-		}
 		break;
 	}
 	case RATE_MATCH_CRS:
-- 
2.47.0