netdev - [PATCH net] dt-bindings: net: dwmac: fix queue priority documentation

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Date:   Tue,  5 Jan 2021 16:47:48 +0100
From:   "Sebastien Laveze (OSS)" <sebastien.laveze@....nxp.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH net] dt-bindings: net: dwmac: fix queue priority documentation

From: Seb Laveze <sebastien.laveze@....com>

The priority field is not the queue priority (queue priority is fixed)
but a bitmask of priorities assigned to this queue.

In receive, priorities relate to tagged frames priorities.

In transmit, priorities relate to PFC frames.

Signed-off-by: Seb Laveze <sebastien.laveze@....com>
---
 Documentation/devicetree/bindings/net/snps,dwmac.yaml | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
index 11a6fdb657c9..9f6ba47513a7 100644
--- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
@@ -161,7 +161,8 @@ properties:
             * snps,route-dcbcp, DCB Control Packets
             * snps,route-up, Untagged Packets
             * snps,route-multi-broad, Multicast & Broadcast Packets
-          * snps,priority, RX queue priority (Range 0x0 to 0xF)
+          * snps,priority, bitmask of the tagged frames priorities assigned to
+            the queue
 
   snps,mtl-tx-config:
     $ref: /schemas/types.yaml#definitions/phandle
@@ -188,7 +189,10 @@ properties:
             * snps,idle_slope, unlock on WoL
             * snps,high_credit, max write outstanding req. limit
             * snps,low_credit, max read outstanding req. limit
-          * snps,priority, TX queue priority (Range 0x0 to 0xF)
+          * snps,priority, bitmask of the priorities assigned to the queue.
+            When a PFC frame is received with priorities matching the bitmask,
+            the queue is blocked from transmitting for the pause time specified
+            in the PFC frame.
 
   snps,reset-gpio:
     deprecated: true
-- 
2.25.1