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[Ural Tunaboyu <2102113@xxxxxxxxxxxxxxxxxx>]

Ubuntu 24.10 (Oracular Oriole) has reached end of life, so this bug will
not be fixed for that specific release.

** Changed in: linux (Ubuntu Oracular)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/2102113

Title:
  intel i219-LM on Dell 5420 with bad NVM checksum doesn't work  with
  e1000e driver

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  New
Status in linux source package in Xenial:
  New
Status in linux source package in Bionic:
  New
Status in linux source package in Focal:
  New
Status in linux source package in Jammy:
  New
Status in linux source package in Noble:
  New
Status in linux source package in Oracular:
  Won't Fix
Status in linux source package in Plucky:
  In Progress

Bug description:
  [SRU Justification]

  [Impact]                                                                                                                                                               
                                                                                                                                                                         
  Kernel module e1000e on load performs NVM checksum validation. This may                                                                                                
  fails when the EEPROM got corrupted, but if bypassed the NIC still works                                                                                               
  as it supposed to. This was once resolved for Presice in LP #1070182,                                                                                                  
  and carried all the way up until dropped in Trusty for unknown reason.                                                                                                 
                                                                                                                                                                         
  This patch adds the eeprom_bad_csum_allow module parameter for the                                                                                                     
  e1000 and e1000e drivers. This allows users of affected hardware                                                                                                       
  to bypass EEPROM/NVM checksum validation.                                                                                                                              
                                                                                                                                                                         
  This patch was first sent to kernel mailing list as                                                                                                                    
  https://lore.kernel.org/lkml/471E817D.5030500@xxxxxxxxx/, but was                                                                                                      
  rejected for the favor of fixing the actual root cause in the EEPROM.                                                                                                  
  Then this was once accepted for Presice in LP #1070182, and had been                                                                                                   
  carried all the way up until dropped in Trusty for unknown reason.

  [Fix]

  Cherry pick commit fc650e376e72 ("UBUNTU: SAUCE: add
  eeprom_bad_csum_allow module parameter") from linux/precise.

  [Test Case]

  1. Boot the patched kernel. The dmesg should have following error
  message on devices with corrupted NIC EEPROM:

    e1000e 0000:00:19.0: >The NVM Checksum Is Not Valid
    e1000e: probe of 0000:00:19.0 failed with error -5

  2. Unload the driver and reload with eeprom_bad_csum_allow=1:

    $ sudo modprobe -r e1000e
    $ sudo modprobe e1000e eeprom_bad_csum_allow=1

  3. Check if netdev is up:

    $ ip link

  [Where problems could occur]

  From the discussion thread, skipping checksum validation works only as a
  quick work-around, and the configurations stored in EEPROM still matter
  in runtime. The adapter may still fail to work as expected.

  [Other Info]

  To pick up this patch for all living kernels. Nominate for Trusty,
  Xenial, Bionic, Focal, Jammy, Noble, Oracular, Plucky and Unstable.

  ============ original bug report ============

  I work with the company that has obtained 300 used Dell Latitude 5420
  laptops. They ware running Windows previously without problems.
  However under Ubuntu (22.04; 24.10) there is a problem with Intel
  i219-LM (13) NIC. Kernel module e1000e on load performs NVM checksum
  validation and fails. Tested sample suggests about 70% of laptops are
  affected.

  I modified e1000e module to bypass checksum and after that NIC works
  as it supposed to. I tried to correct NVM using ethtool and intel
  provided tool but it seems Dell locked writing to NVM on these
  laptops.

  I searched internet and this is not the first time this problem has
  occurred. There even used to be a patch  adding module parameter to
  force checksum bypass (https://patchwork.ozlabs.org/project/ubuntu-
  kernel/patch/50C8F2B8.9020007@xxxxxxxxxxxxx/#470600). I wonder why
  ubuntu kernel is no longer shipped with this patch? Can you add this
  patch back or similar workaround?

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