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: pvale...@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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