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| author | Mauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com> | 2019-07-18 20:52:02 +0300 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2019-08-22 23:24:13 +0300 |
| commit | bc6c1eaaedee7bb1bbdef27e155f15510128762e (patch) | |
| tree | 6df3e9af9ebf4dda84bb9eb9c1109ba6438311dc /drivers/ptp/ptp_chardev.c | |
| parent | 33b165684ab70867d4545643f550a5d48d3ddc57 (diff) | |
| download | linux-bc6c1eaaedee7bb1bbdef27e155f15510128762e.tar.xz | |
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/ptp/ptp_chardev.c')
0 files changed, 0 insertions, 0 deletions