[DPDK/ethdev Bug 1638] Differences in how different Intel NICs handle maximum packet length for jumbo frame

[DPDK/ethdev Bug 1638] Differences in how different Intel NICs handle maximum packet length for jumbo frame

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1638

            Bug ID: 1638
           Summary: Differences in how different Intel NICs handle maximum
                    packet length for jumbo frame
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: nandinipersad361@gmail.com
  Target Milestone: ---

10 Gigabit Ethernet devices from Intel do not take VLAN tags into account when
calculating packet size while Gigabit Ethernet devices do so for jumbo frames.

Implication:
When receiving packets with VLAN tags, the actual maximum size of useful
payload that Intel Gigabit Ethernet devices are able to receive is 4 bytes (or
8 bytes in the case of packets with extended VLAN tags) less than that of Intel
10 Gigabit Ethernet devices.

Resolution/Workaround:
Increase the configured maximum packet size when using Intel Gigabit Ethernet
devices.

Affected Environment/Platform:
All.

Driver/Module:
Poll Mode Driver (PMD).

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