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Message-ID: <761d6ae2-e779-2a4b-a735-960c716c3024@linaro.org>
Date: Sat, 22 Oct 2022 12:05:15 -0400
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sebastian Reichel <sebastian.reichel@...labora.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel@...labora.com
Subject: Re: [PATCH 1/1] dt-bindings: net: snps,dwmac: Document queue config
subnodes
On 21/10/2022 13:10, Sebastian Reichel wrote:
> The queue configuration is referenced by snps,mtl-rx-config and
> snps,mtl-tx-config. Most in-tree DTs put the referenced object
> as child node of the dwmac node.
>
> This adds proper description for this setup, which has the
> advantage of properly making sure only known properties are
> used.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
> .../devicetree/bindings/net/snps,dwmac.yaml | 154 ++++++++++++------
> 1 file changed, 108 insertions(+), 46 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index 13b984076af5..0bf6112cec2f 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -167,56 +167,118 @@ properties:
> snps,mtl-rx-config:
> $ref: /schemas/types.yaml#/definitions/phandle
> description:
> - Multiple RX Queues parameters. Phandle to a node that can
> - contain the following properties
> - * snps,rx-queues-to-use, number of RX queues to be used in the
> - driver
> - * Choose one of these RX scheduling algorithms
> - * snps,rx-sched-sp, Strict priority
> - * snps,rx-sched-wsp, Weighted Strict priority
> - * For each RX queue
> - * Choose one of these modes
> - * snps,dcb-algorithm, Queue to be enabled as DCB
> - * snps,avb-algorithm, Queue to be enabled as AVB
> - * snps,map-to-dma-channel, Channel to map
> - * Specifiy specific packet routing
> - * snps,route-avcp, AV Untagged Control packets
> - * snps,route-ptp, PTP Packets
> - * snps,route-dcbcp, DCB Control Packets
> - * snps,route-up, Untagged Packets
> - * snps,route-multi-broad, Multicast & Broadcast Packets
> - * snps,priority, bitmask of the tagged frames priorities assigned to
> - the queue
> + Multiple RX Queues parameters. Phandle to a node that
> + implements the 'rx-queues-config' object described in
> + this binding.
> +
> + rx-queues-config:
If this field is specific to this device, then you need vendor prefix:
snps,rq-queues-config
> + type: object
> + properties:
> + snps,rx-queues-to-use:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: number of RX queues to be used in the driver
> + snps,rx-sched-sp:
> + type: boolean
> + description: Strict priority
> + snps,rx-sched-wsp:
> + type: boolean
> + description: Weighted Strict priority
> + patternProperties:
> + "^queue[0-9]$":
> + description: Each subnode represents a queue.
> + type: object
> + properties:
> + snps,dcb-algorithm:
> + type: boolean
> + description: Queue to be enabled as DCB
> + snps,avb-algorithm:
> + type: boolean
> + description: Queue to be enabled as AVB
> + snps,map-to-dma-channel:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: DMA channel id to map
> + snps,route-avcp:
> + type: boolean
> + description: AV Untagged Control packets
> + snps,route-ptp:
> + type: boolean
> + description: PTP Packets
> + snps,route-dcbcp:
> + type: boolean
> + description: DCB Control Packets
> + snps,route-up:
> + type: boolean
> + description: Untagged Packets
> + snps,route-multi-broad:
> + type: boolean
> + description: Multicast & Broadcast Packets
> + snps,priority:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: Bitmask of the tagged frames priorities assigned to the queue
> + additionalProperties: false
Please update the DTS example with all this.
>
> snps,mtl-tx-config:
> $ref: /schemas/types.yaml#/definitions/phandle
> description:
> - Multiple TX Queues parameters. Phandle to a node that can
> - contain the following properties
> - * snps,tx-queues-to-use, number of TX queues to be used in the
> - driver
> - * Choose one of these TX scheduling algorithms
> - * snps,tx-sched-wrr, Weighted Round Robin
> - * snps,tx-sched-wfq, Weighted Fair Queuing
> - * snps,tx-sched-dwrr, Deficit Weighted Round Robin
> - * snps,tx-sched-sp, Strict priority
> - * For each TX queue
> - * snps,weight, TX queue weight (if using a DCB weight
> - algorithm)
> - * Choose one of these modes
> - * snps,dcb-algorithm, TX queue will be working in DCB
> - * snps,avb-algorithm, TX queue will be working in AVB
> - [Attention] Queue 0 is reserved for legacy traffic
> - and so no AVB is available in this queue.
> - * Configure Credit Base Shaper (if AVB Mode selected)
> - * snps,send_slope, enable Low Power Interface
> - * snps,idle_slope, unlock on WoL
> - * snps,high_credit, max write outstanding req. limit
> - * snps,low_credit, max read outstanding req. limit
> - * 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.
> + Multiple TX Queues parameters. Phandle to a node that
> + implements the 'tx-queues-config' object described in
> + this binding.
> +
> + tx-queues-config:
> + type: object
> + properties:
> + snps,tx-queues-to-use:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: number of TX queues to be used in the driver
> + snps,tx-sched-wrr:
> + type: boolean
> + description: Weighted Round Robin
> + snps,tx-sched-wfq:
> + type: boolean
> + description: Weighted Fair Queuing
> + snps,tx-sched-dwrr:
> + type: boolean
> + description: Deficit Weighted Round Robin
> + snps,tx-sched-sp:
> + type: boolean
> + description: Strict priority
> + patternProperties:
> + "^queue[0-9]$":
> + description: Each subnode represents a queue.
> + type: object
> + properties:
> + snps,weight:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: TX queue weight (if using a DCB weight algorithm)
> + snps,dcb-algorithm:
> + type: boolean
> + description: TX queue will be working in DCB
> + snps,avb-algorithm:
Is DCB and AVB compatible with each other? If not, then this should be
rather enum (with a string for algorithm name).
This applies also to other fields which are mutually exclusive.
> + type: boolean
> + description:
> + TX queue will be working in AVB.
> + Queue 0 is reserved for legacy traffic and so no AVB is
> + available in this queue.
> + snps,send_slope:
Use hyphens, no underscores.
(This is already an incompatible change in bindings, so we can fix up
the naming)
> + type: boolean
> + description: enable Low Power Interface
> + snps,idle_slope:
> + type: boolean
> + description: unlock on WoL
> + snps,high_credit:
> + type: boolean
> + description: max write outstanding req. limit
Is it really a boolean?
> + snps,low_credit:
> + type: boolean
> + description: max read outstanding req. limit
Same question
> + snps,priority:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Bitmask of the tagged frames 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.
> + additionalProperties: false
>
> snps,reset-gpio:
> deprecated: true
Best regards,
Krzysztof
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