[dpdk-dev] [PATCH 4/8] net/i40e: set TC strict priority mode

[Wu, Jingjing]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Wenzhuo Lu
> Sent: Friday, February 24, 2017 11:25 AM
> To: dev at dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>
> Subject: [dpdk-dev] [PATCH 4/8] net/i40e: set TC strict priority mode
> 
> Set some TCs to strict priority mode.
> It's a global setting on a physical port.
> 
> Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
> ---
>  doc/guides/nics/i40e.rst                  |  10 +++
>  doc/guides/rel_notes/release_17_05.rst    |   7 ++
>  drivers/net/i40e/i40e_ethdev.c            | 119
> ++++++++++++++++++++++++++++++
>  drivers/net/i40e/i40e_ethdev.h            |   1 +
>  drivers/net/i40e/rte_pmd_i40e.h           |  15 ++++
>  drivers/net/i40e/rte_pmd_i40e_version.map |   1 +
>  6 files changed, 153 insertions(+)
> 
> diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index
> 260287e..361d9d9 100644
> --- a/doc/guides/nics/i40e.rst
> +++ b/doc/guides/nics/i40e.rst
> @@ -478,3 +478,13 @@ enabled. If so, return failure.
>  When enabling per TC max bandwidth, SW will check if per VF max bandwidth
> is enabled. If so, disable per VF max bandwidth and continue with per TC max
> bandwidth setting.
> +
> +TC TX scheduling mode setting
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +There're 2 TX scheduling modes for TCs, round robin and strict priority mode.
> +If a TC is set to strict priority mode, it can consume unlimited bandwidth.
> +It means if APP has set the max bandwidth for that TC, it comes to no
> +effect.
> +It's suggested to set the strict priority mode for a TC that is latency
> +sensitive but no consuming much bandwidth.
> diff --git a/doc/guides/rel_notes/release_17_05.rst
> b/doc/guides/rel_notes/release_17_05.rst
> index d31435c..99811a2 100644
> --- a/doc/guides/rel_notes/release_17_05.rst
> +++ b/doc/guides/rel_notes/release_17_05.rst
> @@ -55,6 +55,13 @@ New Features
>    i40e HW supports to set the max bandwidth for a TC on a VF. Enable this
>    capability.
> 
> +* **Added TC strict priority mode setting on i40e.**
> +
> +  There're 2 TX scheduling modes supported for TCs by i40e HW, round
> + ribon mode  and strict priority mode. By default it's round robin
> + mode. Enable the  capability to change the TX scheduling mode for a
> + TC. It's a global setting  on a physical port.
> +
>  Resolved Issues


> +	if (!veb->strict_prio_tc)
> +		ret = i40e_aq_config_switch_comp_ets(
> +			hw, veb->uplink_seid,
> +			&ets_data, i40e_aqc_opc_enable_switching_comp_ets,
> +			NULL);

How about to check the tc_map when the first time to set strict_prio_tc?