[DPDK/ethdev Bug 1432] net/tap: use kernel for TSO offload

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1432

            Bug ID: 1432
           Summary: net/tap: use kernel for TSO offload
           Product: DPDK
           Version: 24.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

The kernel TAP device supports TSO for doing segmentation offload.
This should be used instead of doing GSO inside the TAP PMD because it will
improve performance.

If using kernel TSO, no copy is necessary in PMD and only a single syscall
would be needed for the TSO mbuf.  For example, sending a 64K TSO mbuf would
become single writev(); instead of multiple allocations and copies followed by
multiple writev's.

Doing this would also simplfy code and error handling.

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