[Bug 242159] [em] I219-V connection lost under load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242159

            Bug ID: 242159
           Summary: [em] I219-V connection lost under load
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: julien at perdition.city

Created attachment 209347
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=209347&action=edit
sysctl dev.em

Hello,

On my Lenovo X1 Carbon 6th Gen the network interface jumps constantly from DOWN
to UP when there is some traffic. Sometimes it completely freeze and only a
reboot solves the problem:

Nov 22 20:46:40 x1 kernel: em0: link state changed to DOWN
Nov 22 20:46:43 x1 kernel: em0: link state changed to UP
Nov 22 20:46:48 x1 dhclient[2805]: New IP Address (em0): 192.168.0.88
Nov 22 20:46:48 x1 dhclient[2806]: New Subnet Mask (em0): 255.255.255.0
Nov 22 20:46:48 x1 dhclient[2807]: New Broadcast Address (em0): 192.168.0.255
Nov 22 20:46:48 x1 dhclient[2808]: New Routers (em0): 192.168.0.254
Nov 22 20:46:49 x1 kernel: em0: link state changed to DOWN
Nov 22 20:46:52 x1 kernel: em0: link state changed to UP
Nov 22 20:47:00 x1 dhclient[2829]: New IP Address (em0): 192.168.0.88
Nov 22 20:47:00 x1 dhclient[2830]: New Subnet Mask (em0): 255.255.255.0
Nov 22 20:47:00 x1 dhclient[2831]: New Broadcast Address (em0): 192.168.0.255
Nov 22 20:47:00 x1 dhclient[2832]: New Routers (em0): 192.168.0.254
Nov 22 20:47:10 x1 kernel: em0: link state changed to DOWN
Nov 22 20:47:12 x1 kernel: em0: link state changed to UP
Nov 22 20:47:21 x1 dhclient[2856]: New IP Address (em0): 192.168.0.88
Nov 22 20:47:21 x1 dhclient[2857]: New Subnet Mask (em0): 255.255.255.0
Nov 22 20:47:21 x1 dhclient[2858]: New Broadcast Address (em0): 192.168.0.255
Nov 22 20:47:21 x1 dhclient[2859]: New Routers (em0): 192.168.0.254
(...)

This is with:

em0 at pci0:0:31:6:        class=0x020000 card=0x225c17aa chip=0x15d88086 rev=0x21
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection (4) I219-V'
    class      = network
    subclass   = ethernet

Nothing special in the config:

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=81249b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,WOL_MAGIC,VLAN_HWFILTER>
        ether 8c:16:45:ad:ef:df
        inet 192.168.0.88 netmask 0xffffff00 broadcast 192.168.0.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

I tried with intel-em-kmod-7.7.5 and it works as expected, so I guess some
IFLIB problem ..

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