linux-kernel - [PATCH net 2/2] net: amd-xgbe: Check only the minimum speed for active/passive cables

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Message-ID: <852265b14d35ee1e508b71d814f7532d12d5cf14.1670516545.git.thomas.lendacky@amd.com>
Date:   Thu, 8 Dec 2022 10:22:25 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>
Subject: [PATCH net 2/2] net: amd-xgbe: Check only the minimum speed for active/passive cables

There are cables that exist that can support speeds in excess of 10GbE.
The driver, however, restricts the EEPROM advertised nominal bitrate to
a specific range, which can prevent usage of cables that can support,
for example, up to 25GbE.

Rather than checking that an active or passive cable supports a specific
range, only check for a minimum supported speed.

Fixes: abf0a1c2b26a ("amd-xgbe: Add support for SFP+ modules")
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
index 868a768f424c..c731a04731f8 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
@@ -237,10 +237,7 @@ enum xgbe_sfp_speed {
 
 #define XGBE_SFP_BASE_BR			12
 #define XGBE_SFP_BASE_BR_1GBE_MIN		0x0a
-#define XGBE_SFP_BASE_BR_1GBE_MAX		0x0d
 #define XGBE_SFP_BASE_BR_10GBE_MIN		0x64
-#define XGBE_SFP_BASE_BR_10GBE_MAX		0x68
-#define XGBE_MOLEX_SFP_BASE_BR_10GBE_MAX	0x78
 
 #define XGBE_SFP_BASE_CU_CABLE_LEN		18
 
@@ -827,29 +824,22 @@ static void xgbe_phy_sfp_phy_settings(struct xgbe_prv_data *pdata)
 static bool xgbe_phy_sfp_bit_rate(struct xgbe_sfp_eeprom *sfp_eeprom,
 				  enum xgbe_sfp_speed sfp_speed)
 {
-	u8 *sfp_base, min, max;
+	u8 *sfp_base, min;
 
 	sfp_base = sfp_eeprom->base;
 
 	switch (sfp_speed) {
 	case XGBE_SFP_SPEED_1000:
 		min = XGBE_SFP_BASE_BR_1GBE_MIN;
-		max = XGBE_SFP_BASE_BR_1GBE_MAX;
 		break;
 	case XGBE_SFP_SPEED_10000:
 		min = XGBE_SFP_BASE_BR_10GBE_MIN;
-		if (memcmp(&sfp_eeprom->base[XGBE_SFP_BASE_VENDOR_NAME],
-			   XGBE_MOLEX_VENDOR, XGBE_SFP_BASE_VENDOR_NAME_LEN) == 0)
-			max = XGBE_MOLEX_SFP_BASE_BR_10GBE_MAX;
-		else
-			max = XGBE_SFP_BASE_BR_10GBE_MAX;
 		break;
 	default:
 		return false;
 	}
 
-	return ((sfp_base[XGBE_SFP_BASE_BR] >= min) &&
-		(sfp_base[XGBE_SFP_BASE_BR] <= max));
+	return sfp_base[XGBE_SFP_BASE_BR] >= min;
 }
 
 static void xgbe_phy_free_phy_device(struct xgbe_prv_data *pdata)
-- 
2.38.1