[dpdk-dev] [Bug 629] ixgbe: 82599 chksum rx offload marks UDP packets over IPv4 with zero checksum as CKSUM_BAD

[dpdk-dev] [Bug 629] ixgbe: 82599 chksum rx offload marks UDP packets over IPv4 with zero checksum as CKSUM_BAD

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=629

            Bug ID: 629
           Summary: ixgbe: 82599 chksum rx offload marks UDP packets over
                    IPv4 with zero checksum as CKSUM_BAD
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: pvalerio@redhat.com
  Target Milestone: ---

on ixgbe (in particular on 82599 hw) when receiving UDP packets with zero
checksum (no checksum) over IPv4,
ol_flags PKT_RX_L4_CKSUM_BAD bit is set, whereas PKT_RX_L4_CKSUM_GOOD was
expected instead.

That happens because of a hardware errata [1], but still, needs to be handled
because applications like
for example, OvS are in turn affected by this issue.

This behavior can be easily reproduced using testpmd with --enable-rx-cksum
option.

# lshw -businfo -c network
Bus info          Device     Class          Description
=======================================================
pci@0000:01:00.0  em1        network        82599ES 10-Gigabit SFI/SFP+ Network
Connection
pci@0000:01:00.1  em2        network        82599ES 10-Gigabit SFI/SFP+ Network
Connection

testpmd -l 2,4 -w 0000:01:00.0 -- -i --port-topology=chained --enable-rx-cksum
testpmd> show device info all

********************* Infos for device 0000:01:00.0 *********************
Bus name: pci
Driver name: net_ixgbe
Devargs: 
Connect to socket: 0

        Port id: 0 
        MAC address: EC:F4:BB:DB:FC:18
        Device name: 0000:01:00.0
        Device speed capability: 1 Gbps   10 Gbps

testpmd> set fwd rxonly
testpmd> set verbose 1
testpmd> start

and sending packets from a tester machine using scapy (w/ zero checksum):

sendp(Ether(src="ec:f4:bb:dc:09:d0",dst="ec:f4:bb:db:fc:18")/IP(src="192.168.30.200",
dst="192.168.30.100")/UDP(chksum=0)/Raw("a"*100), iface="em1")

the results is:

port 0/queue 0: received 1 packets
  src=EC:F4:BB:DC:09:D0 - dst=EC:F4:BB:DB:FC:18 - type=0x0800 - length=142 -
nb_segs=1 - hw ptype: L2_ETHER L3_IPV4 L4_UDP  - sw ptype: L2_ETHER L3_IPV4
L4_UDP  - l2_len=14 - l3_len=20 - l4_len=8 - Receive queue=0x0
  ol_flags: PKT_RX_L4_CKSUM_BAD PKT_RX_IP_CKSUM_GOOD
PKT_RX_OUTER_L4_CKSUM_UNKNOWN


[1]
https://patchwork.ozlabs.org/project/netdev/patch/20090724040031.30202.1531.stgit@localhost.localdomain/

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[dpdk-dev] [Bug 629] ixgbe: 82599 chksum rx offload marks UDP packets over IPv4 with zero checksum as CKSUM_BAD

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=629

Thomas Monjalon (thomas@monjalon.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|IN_PROGRESS                 |RESOLVED

--- Comment #2 from Thomas Monjalon (thomas@monjalon.net) ---
Resolved in http://git.dpdk.org/dpdk/commit/?id=b9c366e029

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