linux-kernel - Re: [PATCH net-next v2 08/14] net: ethernet: qualcomm: Initialize PPE service code settings

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Message-ID: <20250109175845.GQ7706@kernel.org>
Date: Thu, 9 Jan 2025 17:58:45 +0000
From: Simon Horman <horms@...nel.org>
To: Luo Jie <quic_luoj@...cinc.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Lei Wei <quic_leiwei@...cinc.com>,
	Suruchi Agarwal <quic_suruchia@...cinc.com>,
	Pavithra R <quic_pavir@...cinc.com>,
	Jonathan Corbet <corbet@....net>, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org,
	quic_kkumarcs@...cinc.com, quic_linchen@...cinc.com,
	srinivas.kandagatla@...aro.org, bartosz.golaszewski@...aro.org,
	john@...ozen.org
Subject: Re: [PATCH net-next v2 08/14] net: ethernet: qualcomm: Initialize
 PPE service code settings

On Wed, Jan 08, 2025 at 09:47:15PM +0800, Luo Jie wrote:
> PPE service code is a special code (0-255) that is defined by PPE for
> PPE's packet processing stages, as per the network functions required
> for the packet.
> 
> For packet being sent out by ARM cores on Ethernet ports, The service
> code 1 is used as the default service code. This service code is used
> to bypass most of packet processing stages of the PPE before the packet
> transmitted out PPE port, since the software network stack has already
> processed the packet.
> 
> Signed-off-by: Luo Jie <quic_luoj@...cinc.com>

...

> diff --git a/drivers/net/ethernet/qualcomm/ppe/ppe_config.h b/drivers/net/ethernet/qualcomm/ppe/ppe_config.h

...

> +/**
> + * struct ppe_sc_bypss - PPE service bypass bitmaps

nit: struct ppe_sc_bypass

> + * @ingress: Bitmap of features that can be bypassed on the ingress packet.
> + * @egress: Bitmap of features that can be bypassed on the egress packet.
> + * @counter: Bitmap of features that can be bypassed on the counter type.
> + * @tunnel: Bitmap of features that can be bypassed on the tunnel packet.
> + */
> +struct ppe_sc_bypass {
> +	DECLARE_BITMAP(ingress, PPE_SC_BYPASS_INGRESS_SIZE);
> +	DECLARE_BITMAP(egress, PPE_SC_BYPASS_EGRESS_SIZE);
> +	DECLARE_BITMAP(counter, PPE_SC_BYPASS_COUNTER_SIZE);
> +	DECLARE_BITMAP(tunnel, PPE_SC_BYPASS_TUNNEL_SIZE);
> +};

...