[Bug 1296] net/mlx5 driver causing indirect pool leakage when testing IPv6 fragmentation

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1296

            Bug ID: 1296
           Summary: net/mlx5 driver causing indirect pool leakage when
                    testing IPv6 fragmentation
           Product: DPDK
           Version: 22.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: java.liu at ericsson.com
  Target Milestone: ---

When testing IPv6 fragmentation uisng net/mlx5 driver we noticed the indirect
buffer is not returning to the pool and will eventually cause indirect pool to
be exausted.

when using intel nic with iavf driver with same application code the issue is
not seen. There is also no issue for pcap driver.

when review code
https://github.com/DPDK/dpdk/blob/main/drivers/net/mlx5/mlx5_tx.h function
mlx5_tx_free_mbuf(). Seems in rte_pktmbuf_prefree_seg(*pkts) the pkts->next
will be set to NULL for indirect buffer which is linked to the direct buffer.

Test is done by explicitly putting the indirect buffer back to mem pool at end
of function mlx5_tx_free_mbuf().

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