netdev - [net-next Patch v10 8/8] docs: octeontx2: Add Documentation for QOS

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Date:   Wed, 26 Apr 2023 11:17:31 +0530
From:   Hariprasad Kelam <hkelam@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <kuba@...nel.org>, <davem@...emloft.net>,
        <willemdebruijn.kernel@...il.com>, <andrew@...n.ch>,
        <sgoutham@...vell.com>, <lcherian@...vell.com>,
        <gakula@...vell.com>, <jerinj@...vell.com>, <sbhatta@...vell.com>,
        <hkelam@...vell.com>, <naveenm@...vell.com>, <edumazet@...gle.com>,
        <pabeni@...hat.com>, <jhs@...atatu.com>,
        <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <maxtram95@...il.com>, <corbet@....net>
Subject: [net-next Patch v10 8/8] docs: octeontx2: Add Documentation for QOS

Add QOS example configuration along with tc-htb commands

Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
Reviewed-by: Simon Horman <simon.horman@...igine.com>
---
 .../ethernet/marvell/octeontx2.rst            | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst b/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
index 5ba9015336e2..bfd233cfac35 100644
--- a/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
+++ b/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
@@ -13,6 +13,7 @@ Contents
 - `Drivers`_
 - `Basic packet flow`_
 - `Devlink health reporters`_
+- `Quality of service`_
 
 Overview
 ========
@@ -287,3 +288,47 @@ For example::
 	 NIX_AF_ERR:
 	        NIX Error Interrupt Reg : 64
 	        Rx on unmapped PF_FUNC
+
+
+Quality of service
+==================
+
+
+Hardware algorithms used in scheduling
+--------------------------------------
+
+octeontx2 silicon and CN10K transmit interface consists of five transmit levels
+starting from SMQ/MDQ, TL4 to TL1. Each packet will traverse MDQ, TL4 to TL1
+levels. Each level contains an array of queues to support scheduling and shaping.
+The hardware uses the below algorithms depending on the priority of scheduler queues.
+once the usercreates tc classes with different priorities, the driver configures
+schedulers allocated to the class with specified priority along with rate-limiting
+configuration.
+
+1. Strict Priority
+
+      -  Once packets are submitted to MDQ, hardware picks all active MDQs having different priority
+         using strict priority.
+
+2. Round Robin
+
+      - Active MDQs having the same priority level are chosen using round robin.
+
+
+Setup HTB offload
+-----------------
+
+1. Enable HW TC offload on the interface::
+
+        # ethtool -K <interface> hw-tc-offload on
+
+2. Crate htb root::
+
+        # tc qdisc add dev <interface> clsact
+        # tc qdisc replace dev <interface> root handle 1: htb offload
+
+3. Create tc classes with different priorities::
+
+        # tc class add dev <interface> parent 1: classid 1:1 htb rate 10Gbit prio 1
+
+        # tc class add dev <interface> parent 1: classid 1:2 htb rate 10Gbit prio 7
-- 
2.17.1