From: "Mauro S. M. Rodrigues" <maurosr@linux.vnet.ibm.com>
Date: Thu, 18 Jul 2019 14:52:02 -0300
Subject: i40e: Check if transceiver implements DDM before access
Patch-mainline: v5.4-rc1
Git-commit: bc6c1eaaedee7bb1bbdef27e155f15510128762e
References: jsc#SLE-8025
Similar to the ixgbe issue fixed in:
655c91414579 ("ixgbe: Check DDM existence in transceiver before access)
i40e has the same issue when reading eeprom from SFP's module that 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.
Without this patch, due to not checking this bit i40e fails 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.
Signed-off-by: "Mauro S. M. Rodrigues" <maurosr@linux.vnet.ibm.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 6 ++++++
drivers/net/ethernet/intel/i40e/i40e_type.h | 1 +
2 files changed, 7 insertions(+)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -5137,6 +5137,12 @@ static int i40e_get_module_info(struct n
/* Module is not SFF-8472 compliant */
modinfo->type = ETH_MODULE_SFF_8079;
modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
+ } else if (!(sff8472_swap & I40E_MODULE_SFF_DDM_IMPLEMENTED)) {
+ /* Module is SFF-8472 compliant but doesn't implement
+ * Digital Diagnostic Monitoring (DDM).
+ */
+ modinfo->type = ETH_MODULE_SFF_8079;
+ modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
} else {
modinfo->type = ETH_MODULE_SFF_8472;
modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
--- a/drivers/net/ethernet/intel/i40e/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
@@ -443,6 +443,7 @@ struct i40e_nvm_access {
#define I40E_MODULE_SFF_8472_COMP 0x5E
#define I40E_MODULE_SFF_8472_SWAP 0x5C
#define I40E_MODULE_SFF_ADDR_MODE 0x04
+#define I40E_MODULE_SFF_DDM_IMPLEMENTED 0x40
#define I40E_MODULE_TYPE_QSFP_PLUS 0x0D
#define I40E_MODULE_TYPE_QSFP28 0x11
#define I40E_MODULE_QSFP_MAX_LEN 640