linux-kernel - Re: [PATCH 1/7] rtl8xxxu: add code to handle BSS_CHANGED_TXPOWER/IEEE80211_CONF_CHANGE

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Date:   Thu, 13 May 2021 21:09:01 -0700
From:   Joe Perches <joe@...ches.com>
To:     Reto Schneider <code@...o-schneider.ch>, Jes.Sorensen@...il.com,
        linux-wireless@...r.kernel.org, pkshih@...ltek.com
Cc:     yhchuang@...ltek.com, Larry.Finger@...inger.net,
        tehuang@...ltek.com, reto.schneider@...qvarnagroup.com,
        ccchiu77@...il.com, kvalo@...eaurora.org, davem@...emloft.net,
        kuba@...nel.org, Chris Chiu <chiu@...lessos.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] rtl8xxxu: add code to handle
 BSS_CHANGED_TXPOWER/IEEE80211_CONF_CHANGE_POWER

On Fri, 2021-05-14 at 04:04 +0200, Reto Schneider wrote:
> From: Chris Chiu <chiu@...lessos.org>
> 
> The 'iw set txpower' is not handled by the driver. Use the existing
> set_tx_power function to apply the tx power change

trivial notes:

> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
[]
> @@ -1382,6 +1382,38 @@ void rtl8xxxu_gen2_config_channel(struct ieee80211_hw *hw)
>  	}
>  }
>  
> 
> +#define MAX_TXPWR_IDX_NMODE_92S		63
> +
> +u8
> +rtl8xxxu_gen1_dbm_to_txpwridx(struct rtl8xxxu_priv *priv, u16 mode, int dbm)
> +{
> +	u8 txpwridx;
> +	long offset;

why should offset be long when dbm is int?

> +
> +	switch (mode) {
> +	case WIRELESS_MODE_B:
> +		offset = -7;
> +		break;
> +	case WIRELESS_MODE_G:
> +	case WIRELESS_MODE_N_24G:
> +		offset = -8;
> +		break;
> +	default:
> +		offset = -8;
> +		break;
> +	}
> +
> +	if ((dbm - offset) > 0)
> +		txpwridx = (u8)((dbm - offset) * 2);

overflow of u8 when dbm >= 136?


> +	else
> +		txpwridx = 0;
> +
> +	if (txpwridx > MAX_TXPWR_IDX_NMODE_92S)
> +		txpwridx = MAX_TXPWR_IDX_NMODE_92S;
> +
> +	return txpwridx;
> +}
> +
>  void
>  rtl8xxxu_gen1_set_tx_power(struct rtl8xxxu_priv *priv, int channel, bool ht40)
>  {
> @@ -4508,6 +4540,55 @@ rtl8xxxu_wireless_mode(struct ieee80211_hw *hw, struct ieee80211_sta *sta)
>  	return network_type;
>  }
>  
> 
> +static void rtl8xxxu_update_txpower(struct rtl8xxxu_priv *priv, int power)
> +{
> +	bool ht40 = false;

unnecessary initializations.

> +	struct ieee80211_hw *hw = priv->hw;
> +	int channel = hw->conf.chandef.chan->hw_value;
> +	u8 cck_txpwridx, ofdm_txpwridx;
> +	int i, group;
> +
> +	if (!priv->fops->dbm_to_txpwridx)
> +		return;
> +
> +	switch (hw->conf.chandef.width) {
> +	case NL80211_CHAN_WIDTH_20_NOHT:
> +	case NL80211_CHAN_WIDTH_20:
> +		ht40 = false;
> +		break;
> +	case NL80211_CHAN_WIDTH_40:
> +		ht40 = true;
> +		break;
> +	default:
> +		return;
> +	}