[Bug 1129] net/mlx5: cannot transmit if Tx queue is setup with maximum number of descriptors

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1129

            Bug ID: 1129
           Summary: net/mlx5: cannot transmit if Tx queue is setup with
                    maximum number of descriptors
           Product: DPDK
           Version: 22.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: andrew.rybchenko at oktetlabs.ru
  Target Milestone: ---

net/mlx5: cannot transmit if Tx queue is setup with maximum number of
descriptors

net/mlx5 does not report Rx/Tx descriptors limits (min/max/align).
As the result application sees theoretical maximum UINT16_MAX (65535) which is
set as the default by ethdev.

If application tries to use the value to setup Tx queue, setup succeed, but Tx
burst always returns 0. I guess the reason is in the following log message:

mlx5_net: port 0 increased number of descriptors in Tx queue 0 to the next
power of two (0)

i.e. effective number of descriptors is equal to 0.

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