[Bug 236486] [igb] txcsum produces broken checksum for I350 Gigabit Network Connection

[bugzilla-noreply at freebsd.org]

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: net at FreeBSD.org
          Reporter: eugen at 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 at 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.

-- 
You are receiving this mail because:
You are the assignee for the bug.