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authorHariprasad Kelam <hkelam@marvell.com>2023-05-13 11:51:43 +0300
committerDavid S. Miller <davem@davemloft.net>2023-05-15 11:31:08 +0300
commitefe103065ccb4984c094d1547d71d498129cdd89 (patch)
treea15e92cde2604a9c184a93e071b29e179bf53629 /Documentation/networking/device_drivers
parent6cebb6a4b114783af5f4747ffe3ec87d94eccf52 (diff)
downloadlinux-efe103065ccb4984c094d1547d71d498129cdd89.tar.xz
docs: octeontx2: Add Documentation for QOS
Add QOS example configuration along with tc-htb commands Signed-off-by: Hariprasad Kelam <hkelam@marvell.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/device_drivers')
-rw-r--r--Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst45
1 files changed, 45 insertions, 0 deletions
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