netdev - [PATCH net-next] net: sfp: extend bitrate-derived mode for 2500BASE-X

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Message-Id: <E1kyYQf-0004iY-Gh@rmk-PC.armlinux.org.uk>
Date:   Sun, 10 Jan 2021 10:58:37 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next] net: sfp: extend bitrate-derived mode for 2500BASE-X

Extend the bitrate-derived support to include 2500BASE-X for modules
that report a bitrate of 2500Mbaud.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/sfp-bus.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 20b91f5dfc6e..cdfa0a190962 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -337,11 +337,16 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 	 * the bitrate to determine supported modes. Some BiDi modules (eg,
 	 * 1310nm/1550nm) are not 1000BASE-BX compliant due to the differing
 	 * wavelengths, so do not set any transceiver bits.
+	 *
+	 * Do the same for modules supporting 2500BASE-X. Note that some
+	 * modules use 2500Mbaud rather than 3100 or 3200Mbaud for
+	 * 2500BASE-X, so we allow some slack here.
 	 */
-	if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS)) {
-		/* If the bit rate allows 1000baseX */
-		if (br_nom && br_min <= 1300 && br_max >= 1200)
+	if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS) && br_nom) {
+		if (br_min <= 1300 && br_max >= 1200)
 			phylink_set(modes, 1000baseX_Full);
+		if (br_min <= 3200 && br_max >= 2500)
+			phylink_set(modes, 2500baseX_Full);
 	}
 
 	if (bus->sfp_quirk)
-- 
2.20.1