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| author | Mauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com> | 2019-05-23 16:11:12 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:14:12 +0200 |
| commit | b346070c72cd0f154eb799a36cec2b2fdb5d5648 (patch) | |
| tree | bfb08d710cc54815960c72e0e09fb2cf72b20d99 /crypto | |
| parent | 0340c621eca84943c8a81b5c6e49cc88e0eedc38 (diff) | |
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@linux.vnet.ibm.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions