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authorMauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com>2019-07-18 14:52:02 -0300
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2019-08-22 13:24:13 -0700
commitbc6c1eaaedee7bb1bbdef27e155f15510128762e (patch)
tree6df3e9af9ebf4dda84bb9eb9c1109ba6438311dc /drivers
parent33b165684ab70867d4545643f550a5d48d3ddc57 (diff)
i40e: Check if transceiver implements DDM before access
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_ethtool.c6
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_type.h1
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 01e4615b1b4b..41e1240acaea 100644
--- 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 net_device *netdev,
/* 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;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
index 8f43aa47c263..2a6219d66771 100644
--- 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