[Bug 228202] em/igb regression: after r333345 Intel I120 ethernet card is not initialized correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228202

            Bug ID: 228202
           Summary: em/igb regression: after r333345 Intel I120 ethernet
                    card is not initialized correctly
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: maciej at pasternacki.net

Created attachment 193339
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193339&action=edit
dmesg with e1000 DBG, without r333345

After setting DBG to 1 in sys/dev/e1000/e1000_osdep.h, dmesg on r333486 shows
following:

igb0: <Intel(R) PRO/1000 PCI-Express Network Driver> port 0x3000-0x301f mem
0xc1100000-0xc117ffff,0xc1180000-0xc1183fff irq 17 at device 0.0 on pci2
e1000_set_mac_type
igb0: attach_pre capping queues at 4
e1000_set_mac_type
e1000_init_mac_ops_generic
e1000_init_phy_ops_generic
e1000_init_nvm_ops_generic
e1000_init_function_pointers_82575
e1000_init_mac_params_82575
e1000_init_nvm_params_i210
e1000_init_nvm_params_82575
e1000_get_flash_presence_i210
e1000_init_phy_params_82575
e1000_reset_mdicnfg_82580
e1000_get_phy_id_82575
e1000_get_phy_id
e1000_read_phy_reg_gs40g
e1000_acquire_phy_82575
e1000_acquire_swfw_sync
e1000_get_hw_semaphore
Driver can't access device - SMBI bit is set.
PHY Initialization Error
igb0: Setup of Shared code failed, error -2
igb0: IFDI_ATTACH_PRE failed 6
device_attach: igb0 attach returned 6

The igb0 interface does not show up.

After locally reverting r333421 and r333345, the interface is initialized
correctly. Debug dmesg with these revisions added as attachment as it is very
long.

pciconf of the device:

igb0 at pci0:2:0:0:        class=0x020000 card=0x35b48086 chip=0x15338086 rev=0x03
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'I210 Gigabit Network Connection'
    class      = network
    subclass   = ethernet

(without reverting r333345, the card shows in pciconf as "none2 at pci0:2:0:0").

If I can provide any additional information about this issue, please let me
know. My ability to debug this are limited, as this is a remote server and to
access it without networking I need to apply for remote KVM, so experiments
might take some time.

If I can add

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