netdev - [PATCH iproute2-next v2 4/4] devlink: Add documentation for tx_prority and tx

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Message-Id: <20221201102626.56390-5-michal.wilczynski@intel.com>
Date:   Thu,  1 Dec 2022 11:26:26 +0100
From:   Michal Wilczynski <michal.wilczynski@...el.com>
To:     netdev@...r.kernel.org
Cc:     alexandr.lobakin@...el.com, przemyslaw.kitszel@...el.com,
        jiri@...nulli.us, wojciech.drewek@...el.com, dsahern@...il.com,
        stephen@...workplumber.org,
        Michal Wilczynski <michal.wilczynski@...el.com>
Subject: [PATCH iproute2-next v2 4/4] devlink: Add documentation for tx_prority and tx_weight

New netlink attributes tx_priority and tx_weight were added.
Update the man page for devlink-rate to account for new attributes.

Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
---
 man/man8/devlink-rate.8 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/man/man8/devlink-rate.8 b/man/man8/devlink-rate.8
index cc2f50c38619..bcec3c31673a 100644
--- a/man/man8/devlink-rate.8
+++ b/man/man8/devlink-rate.8
@@ -26,12 +26,16 @@ devlink-rate \- devlink rate management
 .RI "{ " DEV/PORT_INDEX " | " DEV/NODE_NAME " } "
 .RB [ " tx_share \fIVALUE " ]
 .RB [ " tx_max \fIVALUE " ]
+.RB [ " tx_priority \fIN " ]
+.RB [ " tx_weight \fIN " ]
 .RB "[ {" " parent \fINODE_NAME " | " noparent " "} ]"
 
 .ti -8
 .BI "devlink port function rate add " DEV/NODE_NAME
 .RB [ " tx_share \fIVALUE " ]
 .RB [ " tx_max \fIVALUE " ]
+.RB [ " tx_priority \fIN " ]
+.RB [ " tx_weight \fIN " ]
 .RB "[ {" " parent \fINODE_NAME " | " noparent " "} ]"
 
 .ti -8
@@ -83,6 +87,20 @@ rate group.
 .PP
 .BI tx_max " VALUE"
 - specifies maximum tx rate value.
+.PP
+.BI tx_priority " N"
+- allows for usage of strict priority arbiter among siblings. This arbitration
+scheme attempts to schedule nodes based on their priority as long as the nodes
+remain within their bandwidth limit. The higher the priority the higher the
+probability that the node will get selected for scheduling.
+.PP
+.BI tx_weight " N"
+- allows for usage of Weighted Fair Queuing arbitration scheme among siblings.
+This arbitration scheme can be used simultaneously with the strict priority.
+As a node is configured with a higher rate it gets more BW relative to it's
+siblings. Values are relative like a percentage points, they basically tell
+how much BW should node take relative to it's siblings.
+.PP
 .TP 8
 .I VALUE
 These parameter accept a floating point number, possibly followed by either a
@@ -123,6 +141,10 @@ To specify in IEC units, replace the SI prefix (k-, m-, g-, t-) with IEC prefix
 (ki-, mi-, gi- and ti-) respectively. Input is case-insensitive.
 .RE
 .PP
+.TP 8
+.I N
+These parameter accept integer meaning weight or priority of a node.
+.PP
 .BI parent " NODE_NAME \fR| " noparent
 - set rate object parent to existing node with name \fINODE_NAME\fR or unset
 parent. Rate limits of the parent node applied to all it's children. Actual
-- 
2.37.2