https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236486
Bug ID: 236486
Summary: [igb] txcsum produces broken checksum for I350 Gigabit
Network Connection
Product: Base System
Version: 11.2-STABLE
Hardware: amd64
OS: Any
Status: New
Keywords: IntelNetworking
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: n...@freebsd.org
Reporter: eu...@freebsd.org
Hi!
The server Dell PowerEdge R640 (baseboard 0PHYDR) with BIOS Version: 1.6.13
02/13/2019 [Hetzner 1.0.2] has Intel 1GB i350 network card:
igb0@pci0:1:0:0: class=0x020000 card=0x1f9a1028 chip=0x15218086 rev=0x01
hdr=0x00
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
It runs FreeBSD 11.2-STABLE/amd64 r344922 with GENERIC kernel config plus
following options only:
options KDB
options KDB_UNATTENDED
options KDB_TRACE
options DDB
options GDB
It also runs ipfw nat that is not compatible with TSO4 so this option is
disabled for igb0. Still, running with tso4 disabled and txcsum enabled, it
suffers from stalled TCP connections due to some TCP segments being sent with
broken checksum occasionally.
ifconfig igb0 -txcsum solves the problem.
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