[DPDK/ethdev Bug 1400] net/ena: Failed to initialize ENA device

[DPDK/ethdev Bug 1400] net/ena: Failed to initialize ENA device

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1400

            Bug ID: 1400
           Summary: net/ena: Failed to initialize ENA device
           Product: DPDK
           Version: 23.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: madhuker.mythri@oracle.com
  Target Milestone: ---

Hi,

With DPDK-23.11 on AWS cloud with ENA network devices, DPDK initialization
failed with 4GB memory for 2 ports.

While DPDK rte_eal_init() call on ENA devices, in the
ena_com_allocate_customer_metrics_buffer() DPDK memory zone with "ena_p0_mz0"
is taking lots of memory in GB's just for one zone, why ?

As part this call "na_com_allocate_customer_metrics_buffer()" API memory size
was passed as '0' (customer_metrics->buffer_len = 0) to this
"ena_mem_alloc_coherent()" API, which call's --> rte_memzone_reserve_aligned()
with RTE_MEMZONE_IOVA_CONTIG option. 
Thus, when memory size is '0' to allocate, this memzone allocated maximum
available contiguous memory in GB's.

So, for two DPDK ENA ports, this two zones takes  around 2GB Or more of memory
in DPDK-23.11. For other Mbuf pool's could not allocate memory, as memory
exhausted.

Why the "customer_metrics->buffer_len = 0" size is '0' passing to this
ena_mem_alloc_coherent() ?

Regards,
Madhuker.

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