21/04/2020 09:29, Bing Zhao: > This patch updates the MLX5 PMD and release notes documentations. > Adding the guideline for hairpin data buffer size configuration. > > Signed-off-by: Bing Zhao <bi...@mellanox.com> > Acked-by: Ori Kam <or...@mellanox.com> > --- > --- a/doc/guides/nics/mlx5.rst > +++ b/doc/guides/nics/mlx5.rst > +- ``hp_buf_log_sz`` parameter [int] > + > + The total data buffer size of a hairpin queue (logarithmic form), in bytes. > + PMD will set the data buffer size to 2 ** ``hp_buf_log_sz``, both for RX & > TX. > + The capacity of the value is sepcified by the Firmware, and the > initialization
sepcified -> specified Firmware -> firmware > + will get a failure if it is out of scope. > + The range of the value is from 11 to 19 right now, and the supported frame > + size of a single packet for hairpin is from 512B to 128KB. It might change > if > + different Firmware release is being used. By using a small value, it could Firmware -> firmware > + reduce the memory consumption but not work with large frame. If the value > is > + too large, the memory consumption will be high and some potential > performance > + degradation will be introduced. > + By default PMD will set this value to 16, which mean that 9KB jumbo frames By default, the PMD > + will be supported. > + > --- a/doc/guides/rel_notes/release_20_05.rst > +++ b/doc/guides/rel_notes/release_20_05.rst > @@ -62,6 +62,7 @@ New Features > > * Added support for matching on IPv4 Time To Live and IPv6 Hop Limit. > * Added support for creating Relaxed Ordering Memory Regions. > + * Added support for configuring Haripin queue data buffer size. Haripin -> Hairpin
