[Bug 235341] em(4): No network traffic after upgrade from 11.2 to 12.0-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235341

--- Comment #3 from kaan <kaan at live.ru> ---
Yes, we still use this hardware, I updated it to 11.4 and I plan to migrate to
version 13 but because this is a rather critical network node, we will carry
out migration in the summer. 
This is the pciconf -lv output for all devices:
hostb0 at pci0:0:0:0:      class=0x060000 card=0x0f318086 chip=0x0f008086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register'
    class      = bridge
    subclass   = HOST-PCI
vgapci0 at pci0:0:2:0:     class=0x030000 card=0x0f318086 chip=0x0f318086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series Graphics & Display'
    class      = display
    subclass   = VGA
ahci0 at pci0:0:19:0:      class=0x010601 card=0x0f238086 chip=0x0f238086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series SATA AHCI Controller'
    class      = mass storage
    subclass   = SATA
xhci0 at pci0:0:20:0:      class=0x0c0330 card=0x0f358086 chip=0x0f358086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx, Celeron N2000 Series USB xHCI'
    class      = serial bus
    subclass   = USB
none0 at pci0:0:26:0:      class=0x108000 card=0x0f188086 chip=0x0f188086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine'
    class      = encrypt/decrypt
hdac0 at pci0:0:27:0:      class=0x040300 card=0x0f048086 chip=0x0f048086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series High Definition Audio
Cont          roller'
    class      = multimedia
    subclass   = HDA
pcib1 at pci0:0:28:0:      class=0x060400 card=0x0f488086 chip=0x0f488086 rev=0x0e
          hdr=0x01
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series PCI Express Root Port 1'
    class      = bridge
    subclass   = PCI-PCI
pcib2 at pci0:0:28:1:      class=0x060400 card=0x0f4a8086 chip=0x0f4a8086 rev=0x0e
          hdr=0x01
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series PCI Express Root Port 2'
    class      = bridge
    subclass   = PCI-PCI
pcib3 at pci0:0:28:2:      class=0x060400 card=0x0f4c8086 chip=0x0f4c8086 rev=0x0e
          hdr=0x01
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series PCI Express Root Port 3'
    class      = bridge
    subclass   = PCI-PCI
pcib4 at pci0:0:28:3:      class=0x060400 card=0x0f4e8086 chip=0x0f4e8086 rev=0x0e
          hdr=0x01
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series PCI Express Root Port 4'
    class      = bridge
    subclass   = PCI-PCI
ehci0 at pci0:0:29:0:      class=0x0c0320 card=0x0f348086 chip=0x0f348086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series USB EHCI'
    class      = serial bus
    subclass   = USB
isab0 at pci0:0:31:0:      class=0x060100 card=0x0f1c8086 chip=0x0f1c8086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series Power Control Unit'
    class      = bridge
    subclass   = PCI-ISA
none1 at pci0:0:31:3:      class=0x0c0500 card=0x0f128086 chip=0x0f128086 rev=0x0e
          hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series SMBus Controller'
    class      = serial bus
    subclass   = SMBus
em0 at pci0:1:0:0: class=0x020000 card=0x6c401462 chip=0x150c8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82583V Gigabit Network Connection'
    class      = network
    subclass   = ethernet
em1 at pci0:2:0:0: class=0x020000 card=0x6c401462 chip=0x150c8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82583V Gigabit Network Connection'
    class      = network
    subclass   = ethernet
em2 at pci0:3:0:0: class=0x020000 card=0x6c401462 chip=0x150c8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82583V Gigabit Network Connection'
    class      = network
    subclass   = ethernet
em3 at pci0:4:0:0: class=0x020000 card=0x6c401462 chip=0x150c8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82583V Gigabit Network Connection'
    class      = network
    subclass   = ethernet

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