linux-kernel - Re: [PATCH net-next v3 3/6] net: bcmasp: Add support for ASP2.0 Ethernet controller

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Message-ID: <ZGtURVrdqz536ai7@corigine.com>
Date:   Mon, 22 May 2023 13:38:45 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Justin Chen <justin.chen@...adcom.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        bcm-kernel-feedback-list@...adcom.com, justinpopo6@...il.com,
        f.fainelli@...il.com, davem@...emloft.net,
        florian.fainelli@...adcom.com, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, opendmb@...il.com,
        andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        richardcochran@...il.com, sumit.semwal@...aro.org,
        christian.koenig@....com
Subject: Re: [PATCH net-next v3 3/6] net: bcmasp: Add support for ASP2.0
 Ethernet controller

On Fri, May 19, 2023 at 02:19:41PM -0700, Justin Chen wrote:
> Add support for the Broadcom ASP 2.0 Ethernet controller which is first
> introduced with 72165. This controller features two distinct Ethernet
> ports that can be independently operated.
> 
> This patch supports:
> 
> - Wake-on-LAN using magic packets
> - basic ethtool operations (link, counters, message level)
> - MAC destination address filtering (promiscuous, ALL_MULTI, etc.)
> 
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Signed-off-by: Justin Chen <justin.chen@...adcom.com>

...

> +static int bcmasp_netfilt_get_reg_offset(struct bcmasp_priv *priv,
> +					 struct bcmasp_net_filter *nfilt,
> +					 enum asp_netfilt_reg_type reg_type,
> +					 u32 offset)
> +{
> +	u32 block_index, filter_sel;
> +
> +	if (offset < 32) {
> +		block_index = ASP_RX_FILTER_NET_L2;
> +		filter_sel = nfilt->hw_index;
> +	} else if (offset < 64) {
> +		block_index = ASP_RX_FILTER_NET_L2;
> +		filter_sel = nfilt->hw_index + 1;
> +	} else if (offset < 96) {
> +		block_index = ASP_RX_FILTER_NET_L3_0;
> +		filter_sel = nfilt->hw_index;
> +	} else if (offset < 128) {
> +		block_index = ASP_RX_FILTER_NET_L3_0;
> +		filter_sel = nfilt->hw_index + 1;
> +	} else if (offset < 160) {
> +		block_index = ASP_RX_FILTER_NET_L3_1;
> +		filter_sel = nfilt->hw_index;
> +	} else if (offset < 192) {
> +		block_index = ASP_RX_FILTER_NET_L3_1;
> +		filter_sel = nfilt->hw_index + 1;
> +	} else if (offset < 224) {
> +		block_index = ASP_RX_FILTER_NET_L4;
> +		filter_sel = nfilt->hw_index;
> +	} else if (offset < 256) {
> +		block_index = ASP_RX_FILTER_NET_L4;
> +		filter_sel = nfilt->hw_index + 1;
> +	}

Hi Justin,

Perhaps it is not possible.
But it seems to me that it would be nice to have:

	else {
		return -EINVAL;
	}

Otherwise, if that case does occur, block_index and filter_sel
will be used uninitialised.

> +
> +	switch (reg_type) {
> +	case ASP_NETFILT_MATCH:
> +		return ASP_RX_FILTER_NET_PAT(filter_sel, block_index,
> +					     (offset % 32));
> +	case ASP_NETFILT_MASK:
> +		return ASP_RX_FILTER_NET_MASK(filter_sel, block_index,
> +					      (offset % 32));
> +	default:
> +		return -EINVAL;
> +	}
> +}

...