[dpdk-dev] [Bug 784] i40evf rx bytes statistics is losing 4 bytes per packet for vfs from same pf

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=784

            Bug ID: 784
           Summary: i40evf rx bytes statistics is losing 4 bytes per
                    packet for vfs from same pf
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: 839872562 at qq.com
  Target Milestone: ---

Recently, I found an interesting problem on i40evf(X710). It seems something is
wrong when using the interface i40evf_dev_stats_get to get bytes statistics.


1. When using vfs from two pfs for tx/rx, the bytes statistics is correct.


2. When using two vfs of the same pf for tx/rx, the rx bytes statistics is
losing 4 bytes per packet.


I have checked mbufs in the rx funcation, and the pkt_len is corrent in both
scenes. Seems it's related to CRC Strip, but needs further confirmation.

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