netdev - Re: [PATCH net-next v6 05/13] net: wwan: t7xx: Add control port

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Date:   Tue, 12 Apr 2022 15:04:31 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Ricardo Martinez <ricardo.martinez@...ux.intel.com>
cc:     Netdev <netdev@...r.kernel.org>, linux-wireless@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        m.chetan.kumar@...el.com, chandrashekar.devegowda@...el.com,
        linuxwwan@...el.com, chiranjeevi.rapolu@...ux.intel.com,
        haijun.liu@...iatek.com, amir.hanania@...el.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dinesh.sharma@...el.com, eliot.lee@...el.com,
        moises.veleta@...el.com, pierre-louis.bossart@...el.com,
        muralidharan.sethuraman@...el.com, Soumya.Prakash.Mishra@...el.com,
        sreehari.kancharla@...el.com, madhusmita.sahu@...el.com
Subject: Re: [PATCH net-next v6 05/13] net: wwan: t7xx: Add control port

On Thu, 7 Apr 2022, Ricardo Martinez wrote:

> From: Haijun Liu <haijun.liu@...iatek.com>
> 
> Control Port implements driver control messages such as modem-host
> handshaking, controls port enumeration, and handles exception messages.
> 
> The handshaking process between the driver and the modem happens during
> the init sequence. The process involves the exchange of a list of
> supported runtime features to make sure that modem and host are ready
> to provide proper feature lists including port enumeration. Further
> features can be enabled and controlled in this handshaking process.
> 
> Signed-off-by: Haijun Liu <haijun.liu@...iatek.com>
> Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>
> Co-developed-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
> Signed-off-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
> 
> >From a WWAN framework perspective:
> Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
> 
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

> +static int t7xx_prepare_device_rt_data(struct t7xx_sys_info *core, struct device *dev,
> +				       void *data)
> +{
> +	struct feature_query *md_feature = data;
> +	struct mtk_runtime_feature *rt_feature;
> +	unsigned int i, rt_data_len = 0;
> +	struct sk_buff *skb;
> +
> +	/* Parse MD runtime data query */
> +	if (le32_to_cpu(md_feature->head_pattern) != MD_FEATURE_QUERY_ID ||
> +	    le32_to_cpu(md_feature->tail_pattern) != MD_FEATURE_QUERY_ID) {
> +		dev_err(dev, "Invalid feature pattern: head 0x%x, tail 0x%x\n",
> +			le32_to_cpu(md_feature->head_pattern),
> +			le32_to_cpu(md_feature->tail_pattern));
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < FEATURE_COUNT; i++) {
> +		if (FIELD_GET(FEATURE_MSK, md_feature->feature_set[i]) !=
> +		    MTK_FEATURE_MUST_BE_SUPPORTED)
> +			rt_data_len += sizeof(*rt_feature);
> +	}
> +
> +	skb = t7xx_ctrl_alloc_skb(rt_data_len);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	rt_feature  = skb_put(skb, rt_data_len);
> +	memset(rt_feature, 0, rt_data_len);
> +
> +	/* Fill runtime feature */
> +	for (i = 0; i < FEATURE_COUNT; i++) {
> +		u8 md_feature_mask = FIELD_GET(FEATURE_MSK, md_feature->feature_set[i]);
> +
> +		if (md_feature_mask == MTK_FEATURE_MUST_BE_SUPPORTED)
> +			continue;
> +
> +		rt_feature->feature_id = i;
> +		if (md_feature_mask == MTK_FEATURE_DOES_NOT_EXIST)
> +			rt_feature->support_info = md_feature->feature_set[i];
> +
> +		rt_feature++;
> +	}
> +
> +	/* Send HS3 message to device */
> +	t7xx_port_send_ctl_skb(core->ctl_port, skb, CTL_ID_HS3_MSG, 0);
> +	return 0;
> +}
> +
> +static int t7xx_parse_host_rt_data(struct t7xx_fsm_ctl *ctl, struct t7xx_sys_info *core,
> +				   struct device *dev, void *data, int data_length)
> +{
> +	enum mtk_feature_support_type ft_spt_st, ft_spt_cfg;
> +	struct mtk_runtime_feature *rt_feature;
> +	int i, offset;
> +
> +	offset = sizeof(struct feature_query);
> +	for (i = 0; i < FEATURE_COUNT && offset < data_length; i++) {
> +		rt_feature = data + offset;
> +		offset += sizeof(*rt_feature) + le32_to_cpu(rt_feature->data_len);
> +
> +		ft_spt_cfg = FIELD_GET(FEATURE_MSK, core->feature_set[i]);
> +		if (ft_spt_cfg != MTK_FEATURE_MUST_BE_SUPPORTED)
> +			continue;

Do MTK_FEATURE_MUST_BE_SUPPORTED appear in the host rt_features
(unlike in the device rt_features)?


> +	port_count = FIELD_GET(PORT_MSG_PRT_CNT, le32_to_cpu(port_msg->info));
> +	for (i = 0; i < port_count; i++) {
> +		u32 port_info = le32_to_cpu(port_msg->data[i]);
> +		unsigned int ch_id;
> +		bool en_flag;
> +
> +		ch_id = FIELD_GET(PORT_INFO_CH_ID, port_info);
> +		en_flag = !!(port_info & PORT_INFO_ENFLG);

Unnecessary !!


-- 
 i.