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Re: [PATCH 4.8 1/2] brcmutil: add field storing control channel to the struct brcmu_chan

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On 19-5-2016 13:02, Rafał Miłecki wrote:
> Our d11 code supports encoding/decoding channel info into/from chanspec
> format used by firmware. Current implementation is quite misleading
> because of the way "chnum" field is used.
> When encoding channel info, "chnum" has to be filled by a caller with
> *center* channel number. However when decoding chanspec the same field
> is filled with a *control* channel number.
> 
> This can be confusing and doesn't allow accessing all info when
> decoding. Solve it by adding a separated field for control channel.

The need to "access all info" is probably the other patch so you might
hint here that this change is needed for the .get_channel() callback.

Reviewed-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
> Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx>
> ---
>  .../broadcom/brcm80211/brcmfmac/cfg80211.c         | 17 +++++++++--------
>  .../net/wireless/broadcom/brcm80211/brcmfmac/p2p.c | 10 +++++-----
>  .../net/wireless/broadcom/brcm80211/brcmutil/d11.c | 18 ++++++++++--------
>  .../broadcom/brcm80211/include/brcmu_d11.h         | 22 ++++++++++++++++++++++
>  4 files changed, 46 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index d0631b6..597495d 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -2734,7 +2734,7 @@ static s32 brcmf_inform_single_bss(struct brcmf_cfg80211_info *cfg,
>  	if (!bi->ctl_ch) {
>  		ch.chspec = le16_to_cpu(bi->chanspec);
>  		cfg->d11inf.decchspec(&ch);
> -		bi->ctl_ch = ch.chnum;
> +		bi->ctl_ch = ch.control_ch_num;
>  	}
>  	channel = bi->ctl_ch;
>  
> @@ -2852,7 +2852,7 @@ static s32 brcmf_inform_ibss(struct brcmf_cfg80211_info *cfg,
>  	else
>  		band = wiphy->bands[NL80211_BAND_5GHZ];
>  
> -	freq = ieee80211_channel_to_frequency(ch.chnum, band->band);
> +	freq = ieee80211_channel_to_frequency(ch.control_ch_num, band->band);
>  	cfg->channel = freq;
>  	notify_channel = ieee80211_get_channel(wiphy, freq);
>  
> @@ -2862,7 +2862,7 @@ static s32 brcmf_inform_ibss(struct brcmf_cfg80211_info *cfg,
>  	notify_ielen = le32_to_cpu(bi->ie_length);
>  	notify_signal = (s16)le16_to_cpu(bi->RSSI) * 100;
>  
> -	brcmf_dbg(CONN, "channel: %d(%d)\n", ch.chnum, freq);
> +	brcmf_dbg(CONN, "channel: %d(%d)\n", ch.control_ch_num, freq);
>  	brcmf_dbg(CONN, "capability: %X\n", notify_capability);
>  	brcmf_dbg(CONN, "beacon interval: %d\n", notify_interval);
>  	brcmf_dbg(CONN, "signal: %d\n", notify_signal);
> @@ -5280,7 +5280,7 @@ brcmf_bss_roaming_done(struct brcmf_cfg80211_info *cfg,
>  	else
>  		band = wiphy->bands[NL80211_BAND_5GHZ];
>  
> -	freq = ieee80211_channel_to_frequency(ch.chnum, band->band);
> +	freq = ieee80211_channel_to_frequency(ch.control_ch_num, band->band);
>  	notify_channel = ieee80211_get_channel(wiphy, freq);
>  
>  done:
> @@ -5802,14 +5802,15 @@ static int brcmf_construct_chaninfo(struct brcmf_cfg80211_info *cfg,
>  		channel = band->channels;
>  		index = band->n_channels;
>  		for (j = 0; j < band->n_channels; j++) {
> -			if (channel[j].hw_value == ch.chnum) {
> +			if (channel[j].hw_value == ch.control_ch_num) {
>  				index = j;
>  				break;
>  			}
>  		}
>  		channel[index].center_freq =
> -			ieee80211_channel_to_frequency(ch.chnum, band->band);
> -		channel[index].hw_value = ch.chnum;
> +			ieee80211_channel_to_frequency(ch.control_ch_num,
> +						       band->band);
> +		channel[index].hw_value = ch.control_ch_num;
>  
>  		/* assuming the chanspecs order is HT20,
>  		 * HT40 upper, HT40 lower, and VHT80.
> @@ -5911,7 +5912,7 @@ static int brcmf_enable_bw40_2g(struct brcmf_cfg80211_info *cfg)
>  			if (WARN_ON(ch.bw != BRCMU_CHAN_BW_40))
>  				continue;
>  			for (j = 0; j < band->n_channels; j++) {
> -				if (band->channels[j].hw_value == ch.chnum)
> +				if (band->channels[j].hw_value == ch.control_ch_num)
>  					break;
>  			}
>  			if (WARN_ON(j == band->n_channels))
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
> index a70cda6..1652a48 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
> @@ -1246,7 +1246,7 @@ bool brcmf_p2p_scan_finding_common_channel(struct brcmf_cfg80211_info *cfg,
>  		if (!bi->ctl_ch) {
>  			ch.chspec = le16_to_cpu(bi->chanspec);
>  			cfg->d11inf.decchspec(&ch);
> -			bi->ctl_ch = ch.chnum;
> +			bi->ctl_ch = ch.control_ch_num;
>  		}
>  		afx_hdl->peer_chan = bi->ctl_ch;
>  		brcmf_dbg(TRACE, "ACTION FRAME SCAN : Peer %pM found, channel : %d\n",
> @@ -1385,7 +1385,7 @@ int brcmf_p2p_notify_action_frame_rx(struct brcmf_if *ifp,
>  			if (test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
>  				     &p2p->status) &&
>  			    (ether_addr_equal(afx_hdl->tx_dst_addr, e->addr))) {
> -				afx_hdl->peer_chan = ch.chnum;
> +				afx_hdl->peer_chan = ch.control_ch_num;
>  				brcmf_dbg(INFO, "GON request: Peer found, channel=%d\n",
>  					  afx_hdl->peer_chan);
>  				complete(&afx_hdl->act_frm_scan);
> @@ -1428,7 +1428,7 @@ int brcmf_p2p_notify_action_frame_rx(struct brcmf_if *ifp,
>  	memcpy(&mgmt_frame->u, frame, mgmt_frame_len);
>  	mgmt_frame_len += offsetof(struct ieee80211_mgmt, u);
>  
> -	freq = ieee80211_channel_to_frequency(ch.chnum,
> +	freq = ieee80211_channel_to_frequency(ch.control_ch_num,
>  					      ch.band == BRCMU_CHAN_BAND_2G ?
>  					      NL80211_BAND_2GHZ :
>  					      NL80211_BAND_5GHZ);
> @@ -1873,7 +1873,7 @@ s32 brcmf_p2p_notify_rx_mgmt_p2p_probereq(struct brcmf_if *ifp,
>  
>  	if (test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL, &p2p->status) &&
>  	    (ether_addr_equal(afx_hdl->tx_dst_addr, e->addr))) {
> -		afx_hdl->peer_chan = ch.chnum;
> +		afx_hdl->peer_chan = ch.control_ch_num;
>  		brcmf_dbg(INFO, "PROBE REQUEST: Peer found, channel=%d\n",
>  			  afx_hdl->peer_chan);
>  		complete(&afx_hdl->act_frm_scan);
> @@ -1898,7 +1898,7 @@ s32 brcmf_p2p_notify_rx_mgmt_p2p_probereq(struct brcmf_if *ifp,
>  
>  	mgmt_frame = (u8 *)(rxframe + 1);
>  	mgmt_frame_len = e->datalen - sizeof(*rxframe);
> -	freq = ieee80211_channel_to_frequency(ch.chnum,
> +	freq = ieee80211_channel_to_frequency(ch.control_ch_num,
>  					      ch.band == BRCMU_CHAN_BAND_2G ?
>  					      NL80211_BAND_2GHZ :
>  					      NL80211_BAND_5GHZ);
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c b/drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c
> index 2b2522b..d8b79cb 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c
> @@ -107,6 +107,7 @@ static void brcmu_d11n_decchspec(struct brcmu_chan *ch)
>  	u16 val;
>  
>  	ch->chnum = (u8)(ch->chspec & BRCMU_CHSPEC_CH_MASK);
> +	ch->control_ch_num = ch->chnum;
>  
>  	switch (ch->chspec & BRCMU_CHSPEC_D11N_BW_MASK) {
>  	case BRCMU_CHSPEC_D11N_BW_20:
> @@ -118,10 +119,10 @@ static void brcmu_d11n_decchspec(struct brcmu_chan *ch)
>  		val = ch->chspec & BRCMU_CHSPEC_D11N_SB_MASK;
>  		if (val == BRCMU_CHSPEC_D11N_SB_L) {
>  			ch->sb = BRCMU_CHAN_SB_L;
> -			ch->chnum -= CH_10MHZ_APART;
> +			ch->control_ch_num -= CH_10MHZ_APART;
>  		} else {
>  			ch->sb = BRCMU_CHAN_SB_U;
> -			ch->chnum += CH_10MHZ_APART;
> +			ch->control_ch_num += CH_10MHZ_APART;
>  		}
>  		break;
>  	default:
> @@ -147,6 +148,7 @@ static void brcmu_d11ac_decchspec(struct brcmu_chan *ch)
>  	u16 val;
>  
>  	ch->chnum = (u8)(ch->chspec & BRCMU_CHSPEC_CH_MASK);
> +	ch->control_ch_num = ch->chnum;
>  
>  	switch (ch->chspec & BRCMU_CHSPEC_D11AC_BW_MASK) {
>  	case BRCMU_CHSPEC_D11AC_BW_20:
> @@ -158,10 +160,10 @@ static void brcmu_d11ac_decchspec(struct brcmu_chan *ch)
>  		val = ch->chspec & BRCMU_CHSPEC_D11AC_SB_MASK;
>  		if (val == BRCMU_CHSPEC_D11AC_SB_L) {
>  			ch->sb = BRCMU_CHAN_SB_L;
> -			ch->chnum -= CH_10MHZ_APART;
> +			ch->control_ch_num -= CH_10MHZ_APART;
>  		} else if (val == BRCMU_CHSPEC_D11AC_SB_U) {
>  			ch->sb = BRCMU_CHAN_SB_U;
> -			ch->chnum += CH_10MHZ_APART;
> +			ch->control_ch_num += CH_10MHZ_APART;
>  		} else {
>  			WARN_ON_ONCE(1);
>  		}
> @@ -172,16 +174,16 @@ static void brcmu_d11ac_decchspec(struct brcmu_chan *ch)
>  					 BRCMU_CHSPEC_D11AC_SB_SHIFT);
>  		switch (ch->sb) {
>  		case BRCMU_CHAN_SB_LL:
> -			ch->chnum -= CH_30MHZ_APART;
> +			ch->control_ch_num -= CH_30MHZ_APART;
>  			break;
>  		case BRCMU_CHAN_SB_LU:
> -			ch->chnum -= CH_10MHZ_APART;
> +			ch->control_ch_num -= CH_10MHZ_APART;
>  			break;
>  		case BRCMU_CHAN_SB_UL:
> -			ch->chnum += CH_10MHZ_APART;
> +			ch->control_ch_num += CH_10MHZ_APART;
>  			break;
>  		case BRCMU_CHAN_SB_UU:
> -			ch->chnum += CH_30MHZ_APART;
> +			ch->control_ch_num += CH_30MHZ_APART;
>  			break;
>  		default:
>  			WARN_ON_ONCE(1);
> diff --git a/drivers/net/wireless/broadcom/brcm80211/include/brcmu_d11.h b/drivers/net/wireless/broadcom/brcm80211/include/brcmu_d11.h
> index f9745ea..8b8b2ec 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/include/brcmu_d11.h
> +++ b/drivers/net/wireless/broadcom/brcm80211/include/brcmu_d11.h
> @@ -125,14 +125,36 @@ enum brcmu_chan_sb {
>  	BRCMU_CHAN_SB_UU = BRCMU_CHAN_SB_LUU,
>  };
>  
> +/**
> + * struct brcmu_chan - stores channel formats
> + *
> + * This structure can be used with functions translating chanspec into generic
> + * channel info and the other way.
> + *
> + * @chspec: firmware specific format
> + * @chnum: center channel number
> + * @control_ch_num: control channel number
> + * @band: frequency band
> + * @bw: channel width
> + * @sb: control sideband (location of control channel against the center one)
> + */
>  struct brcmu_chan {
>  	u16 chspec;
>  	u8 chnum;
> +	u8 control_ch_num;
>  	u8 band;
>  	enum brcmu_chan_bw bw;
>  	enum brcmu_chan_sb sb;
>  };
>  
> +/**
> + * struct brcmu_d11inf - provides functions translating channel formats
> + *
> + * @io_type: determines version of channel format used by firmware
> + * @encchspec: encodes channel info into a chanspec, requires center channel
> + *	number, ignores control one
> + * @decchspec: decodes chanspec into generic info
> + */
>  struct brcmu_d11inf {
>  	u8 io_type;
>  
> 
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