i40e: Check if transceiver implements DDM before access

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Similar to the ixgbe issue fixed in:
655c914145 ("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>

...

This commit is contained in:

Mauro S. M. Rodrigues 2019-07-18 14:52:02 -03:00 • committed by Jeff Kirsher

parent 33b165684a

commit bc6c1eaaed

2 changed files with 7 additions and 0 deletions

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6

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

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1

drivers/net/ethernet/intel/i40e/i40e_type.h

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