Compression Level is interpreted by each PMD differently.
However, lower numbers give faster compression
at the expense of compression ratio, while higher numbers
may give better compression ratios but are likely slower.
The level affects the block size, which affects performance,
the bigger the block, the faster the compression is.

The problem was that higher levels caused bigger blocks:
  size = min_block_size - 1 + level.

the solution is to reverse the above:
  size = max_block_size + 1 - level.

Fixes: 39a2c8715f8f ("compress/mlx5: add transformation operations")
Cc: matan@nvidia.com
Cc: stable@dpdk.org

Signed-off-by: Raja Zidane <redacted>
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This patch is not acked, hence not applied for RC3.
@Thomas Monjalon can you pick it directly if it gets acked?