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

From: RafaÅ MiÅecki
Date: Thu May 19 2016 - 07:03:33 EST

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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.

Signed-off-by: RafaÅ MiÅecki <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;

--
1.8.4.5

Next message: RafaÅ MiÅecki: "[PATCH 4.8 2/2] brcmfmac: support get_channel cfg80211 callback"
Previous message: James Bottomley: "Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount"
Next in thread: RafaÅ MiÅecki: "[PATCH 4.8 2/2] brcmfmac: support get_channel cfg80211 callback"
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