brcmutil: add field storing control channel to the struct brcmu_chan

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.

1) This can be confusing. It's expected for information to be the same
   after encoding and decoding.
2) It doesn't allow accessing all info when decoding. Some functions may
   need to know both channel numbers, e.g. cfg80211 callback getting
   current channel.
Solve this by adding a separated field for control channel.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 16271c2300e9b2062bd94410c80d3287d13ba6de..b044c7e48f915dd863c19b0154d88c4fe4d6218d 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -2749,7 +2749,7 @@ 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;
 
@@ -2867,7 +2867,7 @@ 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);
 
@@ -2877,7 +2877,7 @@ 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);
@@ -5295,7 +5295,7 @@ 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:
@@ -5817,14 +5817,15 @@ 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.
@@ -5926,7 +5927,7 @@ 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 a70cda6c05920811a84605985a2024aa0b10b792..1652a48f4ea8e29225997694c8cf9f55604191df 100644 (file)
--- 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 2b2522bdd8eb516b422a779b4057b89bd959400e..d8b79cb72b58d3153c095c5e93896a0ba99f539a 100644 (file)
--- 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 f9745ea8b3e042d4cec222518d7b2fb76439eedf..8b8b2ecb319946251e01817be0209e189056a8d5 100644 (file)
--- 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 format
+ *
+ * @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;