mlx5 NIC reports checksum unknown when an invalid checksum is present

https://bugs.dpdk.org/show_bug.cgi?id=1514

Bug ID: 1514
Summary: mlx5 NIC reports checksum unknown when an invalid
checksum is present
Product: DPDK
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: testpmd
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

When running testpmd in verbose mode on a NIC that uses the mlx5_core PMD, if you send a packet with an invalid IP checksum it will show the ol_flag RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN when it should be RTE_MBUF_F_RX_IP_CKSUM_BAD. According to lib/mbuf/rte_mbuf_core.h RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN should be shown when there is "no information about the RX IP checksum" and RTE_MBUF_F_RX_IP_CKSUM_BAD should be shown when "the IP checksum in the packet is wrong". This leads to an issue currently where, from verbose output in testpmd, you cannot distinguish between a packet having a bad checksum and one not being present at all. It should be noted that this is also the case for L4 and OUTER_L4 checksums as well.

You can reproduce this by sending a scapy packet with the following structure to the testpmd shell that is forwarding with verbose mode set to 1:

pakt = Ether() / IP(chksum=0x0)

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