[Bug 205706] Watchdog timeout on em driver under heavy traffic on a bridge configuration

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205706

Peter <enigma.algo at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |enigma.algo at gmail.com

--- Comment #8 from Peter <enigma.algo at gmail.com> ---
Same issue for me with the em0 driver. Kernel Version 11.0-RELEASE-p12
In the setup are two OpnSense firewalls (COTS PCs) back-2-back with an IPsec
tunnel between. The error shows up immediately when traffic is generated on the
LAN side(s) at the same time. I feed 64Byte Ethernet frames with an IXIA test
generator. Packet rate is 1448000 pps.

I believe its always the WAN side (on both PCs), the em driver hangs with
following error:

em0: Watchdog timeout Queue[0]-- resetting
Interface is RUNNING and ACTIVE
em0: TX Queue 0 ------
em0: hw tdh = 818, hw tdt = 777
em0: Tx Queue Status = -2147483648
em0: TX descriptors avail = 40
em0: Tx Descriptors avail failure = 17012
em0: RX Queue 0 ------
em0: hw rdh = 139, hw rdt = 139
em0: RX discarded packets = 0
em0: RX Next to Check = 140
em0: RX Next to Refresh = 139

Nothing will cure this problem unless I reboot. I also tried to play with mbufs
but without success.

pciconf -lvbc
em0 at pci0:1:0:0: class=0x020000 card=0xa01f8086 chip=0x10d38086 rev=0x00
hdr=0x00
vendor     = 'Intel Corporation'
device     = '82574L Gigabit Network Connection'
class      = network
subclass   = ethernet
bar   [10] = type Memory, range 32, base 0xf7ec0000, size 131072, enabled
bar   [14] = type Memory, range 32, base 0xf7e00000, size 524288, enabled
bar   [18] = type I/O Port, range 32, base 0xe000, size 32, enabled
bar   [1c] = type Memory, range 32, base 0xf7ee0000, size 16384, enabled
cap 01[c8] = powerspec 2  supports D0 D3  current D0
cap 05[d0] = MSI supports 1 message, 64 bit 
cap 10[e0] = PCI-Express 1 endpoint max data 256(256) NS
link x1(x1) speed 2.5(2.5) ASPM disabled(L0s/L1)
cap 11[a0] = MSI-X supports 5 messages, enabled
Table in map 0x1c[0x0], PBA in map 0x1c[0x2000]
ecap 0001[100] = AER 1 0 fatal 0 non-fatal 1 corrected
ecap 0003[140] = Serial 1 6805caffff5fda26 

Cheers, Peter

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