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Message-Id: <20190724191705.462413365@linuxfoundation.org>
Date: Wed, 24 Jul 2019 21:19:48 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
"Mauro S. M. Rodrigues" <maurosr@...ux.vnet.ibm.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Andrew Bowers <andrewx.bowers@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 119/271] ixgbe: Check DDM existence in transceiver before access
[ Upstream commit 655c91414579d7bb115a4f7898ee726fc18e0984 ]
Some transceivers may comply with SFF-8472 but not implement the Digital
Diagnostic Monitoring (DDM) interface described in it. The existence of
such area is specified by bit 6 of byte 92, set to 1 if implemented.
Currently, due to not checking this bit ixgbe fails trying to read SFP
module's eeprom with the follow message:
ethtool -m enP51p1s0f0
Cannot get Module EEPROM data: Input/output error
Because it fails to read the additional 256 bytes in which it was assumed
to exist the DDM data.
This issue was noticed using a Mellanox Passive DAC PN 01FT738. The eeprom
data was confirmed by Mellanox as correct and present in other Passive
DACs in from other manufacturers.
Signed-off-by: "Mauro S. M. Rodrigues" <maurosr@...ux.vnet.ibm.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 3 ++-
drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index e5a8461fe6a9..8829bd95d0d3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -3223,7 +3223,8 @@ static int ixgbe_get_module_info(struct net_device *dev,
page_swap = true;
}
- if (sff8472_rev == IXGBE_SFF_SFF_8472_UNSUP || page_swap) {
+ if (sff8472_rev == IXGBE_SFF_SFF_8472_UNSUP || page_swap ||
+ !(addr_mode & IXGBE_SFF_DDM_IMPLEMENTED)) {
/* We have a SFP, but it does not support SFF-8472 */
modinfo->type = ETH_MODULE_SFF_8079;
modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
index 64e44e01c973..c56baad04ee6 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
@@ -45,6 +45,7 @@
#define IXGBE_SFF_SOFT_RS_SELECT_10G 0x8
#define IXGBE_SFF_SOFT_RS_SELECT_1G 0x0
#define IXGBE_SFF_ADDRESSING_MODE 0x4
+#define IXGBE_SFF_DDM_IMPLEMENTED 0x40
#define IXGBE_SFF_QSFP_DA_ACTIVE_CABLE 0x1
#define IXGBE_SFF_QSFP_DA_PASSIVE_CABLE 0x8
#define IXGBE_SFF_QSFP_CONNECTOR_NOT_SEPARABLE 0x23
--
2.20.1
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