netdev - Re: [PATCH 2/7] rtl8xxxu: add handle for mac80211 get

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Date:   Thu, 13 May 2021 21:22:09 -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 2/7] rtl8xxxu: add handle for mac80211 get_txpower

On Fri, 2021-05-14 at 04:04 +0200, Reto Schneider wrote:
> From: Chris Chiu <chiu@...lessos.org>
> 
> add .get_txpower handle for mac80211 operations for `iw` and `wext`
> tools to get the underlying tx power (max limit).
[]
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
[]

> +int
> +rtl8xxxu_gen1_get_tx_power(struct rtl8xxxu_priv *priv)
> +{
> +	u8 txpwr_level;
> +	int txpwr_dbm;
> +
> +	txpwr_level = priv->cur_cck_txpwridx;
> +	txpwr_dbm = rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_B,
> +						  txpwr_level);
> +	txpwr_level = priv->cur_ofdm24g_txpwridx +
> +		      priv->ofdm_tx_power_index_diff[1].a;
> +
> +	if (rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_G, txpwr_level)
> +	    > txpwr_dbm)
> +		txpwr_dbm = rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_G,
> +							  txpwr_level);

probably better to use a temporaries instead of multiple calls.

	foo = rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_G, txpwr_level);
	if (foo > txpwr_dbm)
		txpwr_dbm = foo;

> +	txpwr_level = priv->cur_ofdm24g_txpwridx;
> +	if (rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_N_24G,
> +					  txpwr_level) > txpwr_dbm)
> +		txpwr_dbm = rtl8xxxu_gen1_txpwridx_to_dbm(priv,
> +							  WIRELESS_MODE_N_24G,
> +							  txpwr_level);
> +
> +	return txpwr_dbm;

	foo = rtl8xxxu_gen1_txpwridx_to_dbm(priv, WIRELESS_MODE_N_24G, txpwr_level);

	return min(txpwr_dbm, foo);