[dpdk-dev] [PATCH] doc: update hairpin data buffer size config
Ori Kam
orika at mellanox.com
Mon Apr 20 11:57:25 CEST 2020
> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Bing Zhao
> Sent: Thursday, April 9, 2020 6:51 PM
> To: john.mcnamara at intel.com; marko.kovacevic at intel.com; Slava Ovsiienko
> <viacheslavo at mellanox.com>; Matan Azrad <matan at mellanox.com>
> Cc: Shahaf Shuler <shahafs at mellanox.com>; Raslan Darawsheh
> <rasland at mellanox.com>; dev at dpdk.org
> Subject: [dpdk-dev] [PATCH] doc: update hairpin data buffer size config
>
> This patch updates the MLX5 PMD and release notes documentations.
> Adding the guideline for hairpin data buffer size configuration.
>
> Signed-off-by: Bing Zhao <bingz at mellanox.com>
> ---
> doc/guides/nics/mlx5.rst | 11 +++++++++++
> doc/guides/rel_notes/release_20_05.rst | 1 +
> 2 files changed, 12 insertions(+)
>
> diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
> index e13c07d..c3cde30 100644
> --- a/doc/guides/nics/mlx5.rst
> +++ b/doc/guides/nics/mlx5.rst
> @@ -99,6 +99,7 @@ Features
> - Support for multiple rte_flow groups.
> - Per packet no-inline hint flag to disable packet data copying into Tx
> descriptors.
> - Hardware LRO.
> +- Hairpin.
>
> Limitations
> -----------
> @@ -773,6 +774,16 @@ Run-time configuration
> If this parameter is not specified, by default PMD will set
> the smallest value supported by HW.
>
> +- ``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
> + will get a failure if it is out of scope.
> + A larger value is needed to support larger frame.
> + If this parameter is not specified, by default PMD will set it to 16 and 9KB
> + jumbo frames are supported.
> +
I think we need more clear description what is the size range
and why not set to max or min.
In addition I think that the last line should be something like this:
By default PMD will set this value to 16, which mean that 9KB jumbo
frames will be supported.
> .. _mlx5_firmware_config:
>
> Firmware configuration
> diff --git a/doc/guides/rel_notes/release_20_05.rst
> b/doc/guides/rel_notes/release_20_05.rst
> index 2596269..7128f26 100644
> --- 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.
>
> * **Updated the Intel ice driver.**
>
> --
> 2.5.5
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