netdev - Re: [PATCH] [PATCH] [v3] wireless: Initial driver submission for pureLiFi STA devices

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Date:   Thu, 15 Oct 2020 15:35:26 -0700
From:   Joe Perches <joe@...ches.com>
To:     Srinivasan Raju <srini.raju@...elifi.com>
Cc:     mostafa.afgani@...elifi.com, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:NETWORKING DRIVERS (WIRELESS)" 
        <linux-wireless@...r.kernel.org>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>
Subject: Re: [PATCH] [PATCH] [v3] wireless: Initial driver submission for
 pureLiFi STA devices

On Wed, 2020-10-14 at 11:49 +0530, Srinivasan Raju wrote:
> This introduces the pureLiFi LiFi driver for LiFi-X, LiFi-XC
> and LiFi-XL USB devices.

trivia: netdev_<level> might be better than dev_<level>.

> diff --git a/drivers/net/wireless/purelifi/chip.c b/drivers/net/wireless/purelifi/chip.c
[]
> +int purelifi_chip_switch_radio(struct purelifi_chip *chip, u32 value)
> +{
> +	int r;
> +
> +	r = usb_write_req((const u8 *)&value, sizeof(value), USB_REQ_POWER_WR);
> +	if (r)
> +		dev_err(purelifi_chip_dev(chip), "%s r=%d", __func__, r);

missing '\n' termination.

[]

> > +int purelifi_chip_set_rate(struct purelifi_chip *chip, u8 rate)
> +{
> +	int r;
> +	static struct purelifi_chip *chip_p;
> +
> +	if (chip)
> +		chip_p = chip;
> +	if (!chip_p)
> +		return -EINVAL;
> +
> +	r = usb_write_req((const u8 *)&rate, sizeof(rate), USB_REQ_RATE_WR);
> +	if (r)
> +		dev_err(purelifi_chip_dev(chip), "set rate failed r=%d", r);

same missing newline, etc

It might also be better to use a consistent error message like

		dev_err(purelifi_chip_dev(chip), "%s: failed, r=%d\n", r);

for both.

> diff --git a/drivers/net/wireless/purelifi/mac.c b/drivers/net/wireless/purelifi/mac.c
[]
> +static const struct ieee80211_rate purelifi_rates[] = {
> +	{ .bitrate = 10,
> +		.hw_value = PURELIFI_CCK_RATE_1M, },

[]

> +	{ .bitrate = 60,
> +		.hw_value = PURELIFI_OFDM_RATE_6M,
> +		.flags = 0 },

Seems odd to set .flags to 0 for only some of the entries.
Perhaps more readable to always leave it off if unset.

> +	{ .bitrate = 90,
> +		.hw_value = PURELIFI_OFDM_RATE_9M,
> +		.flags = 0 },
> +	{ .bitrate = 120,
> +		.hw_value = PURELIFI_OFDM_RATE_12M,
> +		.flags = 0 },
> +	{ .bitrate = 180,
> +		.hw_value = PURELIFI_OFDM_RATE_18M,
> +		.flags = 0 },
> +	{ .bitrate = 240,
> +		.hw_value = PURELIFI_OFDM_RATE_24M,
> +		.flags = 0 },
> +	{ .bitrate = 360,
> +		.hw_value = PURELIFI_OFDM_RATE_36M,
> +		.flags = 0 },
> +	{ .bitrate = 480,
> +		.hw_value = PURELIFI_OFDM_RATE_48M,
> +		.flags = 0 },
> +	{ .bitrate = 540,
> +		.hw_value = PURELIFI_OFDM_RATE_54M,
> +		.flags = 0 },
> +};

[]
> +int purelifi_mac_init_hw(struct ieee80211_hw *hw)
> +{
> +	int r;
> +	struct purelifi_mac *mac = purelifi_hw_mac(hw);
> +	struct purelifi_chip *chip = &mac->chip;
> +
> +	r = purelifi_chip_init_hw(chip);
> +	if (r) {
> +		dev_warn(purelifi_mac_dev(mac), "init hw failed. (%d)\n", r);
> +		goto out;
> +	}
> +
> +	dev_dbg(purelifi_mac_dev(mac), "irq_disabled %d", irqs_disabled());

missing newline

> +static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
> +		      struct ieee80211_rx_status *stats)
> +{
> +	struct purelifi_mac *mac = purelifi_hw_mac(hw);
> +	struct sk_buff *skb;
> +	struct sk_buff_head *q;
> +	unsigned long flags;
> +	int found = 0;
> +	int i, position = 0;
> +
> +	if (!ieee80211_is_ack(rx_hdr->frame_control))
> +		return 0;
> +	dev_info(purelifi_mac_dev(mac), "%s::ACK Received", __func__);

missing newline

> +static int purelifi_op_add_interface(struct ieee80211_hw *hw,
> +				     struct ieee80211_vif *vif)
> +{
> +	struct purelifi_mac *mac = purelifi_hw_mac(hw);
> +	static const char * const iftype80211[] = {
> +		[NL80211_IFTYPE_STATION]	= "Station",
> +		[NL80211_IFTYPE_ADHOC]		= "Adhoc"
> +	};
> +
> +	if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
> +		return -EOPNOTSUPP;
> +
> +	if (vif->type == NL80211_IFTYPE_ADHOC ||
> +	    vif->type == NL80211_IFTYPE_STATION) {
> +		dev_info(purelifi_mac_dev(mac), "%s %s\n", __func__,
> +			 iftype80211[vif->type]);
> +		mac->type = vif->type;
> +		mac->vif = vif;
> +	} else {
> +		dev_info(purelifi_mac_dev(mac), "unsupported iftype");

etc...