linux-kernel - [PATCH] net: sfp: handle 100G/25G active optical cables in sfp_parse

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Date:   Thu, 10 Aug 2023 11:48:17 +0200
From:   Josua Mayer <josua@...id-run.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Josua Mayer <josua@...id-run.com>,
        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>
Subject: [PATCH] net: sfp: handle 100G/25G active optical cables in sfp_parse_support

Handle extended compliance code 0x1 (SFF8024_ECC_100G_25GAUI_C2M_AOC)
for active optical cables supporting 25G and 100G speeds.

Since the specification makes no statement about transmitter range, and
as the specific sfp module that had been tested features only 2m fiber -
short-range (SR) modes are selected.

sfp_parse_support already handles SFF8024_ECC_100GBASE_SR4_25GBASE_SR
with compatible properties: 100000baseSR4; 25000baseSR; protocol 25gbase-r.
Add SFF8024_ECC_100G_25GAUI_C2M_AOC to the same case.

Tested with fs.com S28-AO02 AOC SFP28 module.

Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 drivers/net/phy/sfp-bus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index e8dd47bffe43..db26e1d8a10d 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -258,6 +258,7 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 	switch (id->base.extended_cc) {
 	case SFF8024_ECC_UNSPEC:
 		break;
+	case SFF8024_ECC_100G_25GAUI_C2M_AOC:
 	case SFF8024_ECC_100GBASE_SR4_25GBASE_SR:
 		phylink_set(modes, 100000baseSR4_Full);
 		phylink_set(modes, 25000baseSR_Full);
-- 
2.35.3