brcmfmac: Add dump_survey cfg80211 ops for HostApd AutoChannelSelection

To enable ACS feature in Hostap daemon, dump_survey cfg80211 ops and dump
obss survey command in firmware side are needed. This patch is for adding
dump_survey feature and adding DUMP_OBSS feature flag to check if
firmware supports dump_obss iovar.
Signed-off-by: Wright Feng <wright.feng@cypress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Ian Lin <ian.lin@infineon.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220929012527.4152-2-ian.lin@infineon.com

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -88,9 +88,39 @@
 
 #define BRCMF_PS_MAX_TIMEOUT_MS		2000
 
+/* Dump obss definitions */
+#define ACS_MSRMNT_DELAY		100
+#define CHAN_NOISE_DUMMY		(-80)
+#define OBSS_TOKEN_IDX			15
+#define IBSS_TOKEN_IDX			15
+#define TX_TOKEN_IDX			14
+#define CTG_TOKEN_IDX			13
+#define PKT_TOKEN_IDX			15
+#define IDLE_TOKEN_IDX			12
+
 #define BRCMF_ASSOC_PARAMS_FIXED_SIZE \
 	(sizeof(struct brcmf_assoc_params_le) - sizeof(u16))
 
+struct brcmf_dump_survey {
+	u32 obss;
+	u32 ibss;
+	u32 no_ctg;
+	u32 no_pckt;
+	u32 tx;
+	u32 idle;
+};
+
+struct cca_stats_n_flags {
+	u32 msrmnt_time; /* Time for Measurement (msec) */
+	u32 msrmnt_done; /* flag set when measurement complete */
+	char buf[1];
+};
+
+struct cca_msrmnt_query {
+	u32 msrmnt_query;
+	u32 time_req;
+};
+
 static bool check_vif_up(struct brcmf_cfg80211_vif *vif)
 {
 	if (!test_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state)) {
@@ -7525,6 +7555,229 @@ static s32 brcmf_translate_country_code(struct brcmf_pub *drvr, char alpha2[2],
 	return 0;
 }
 
+static int
+brcmf_parse_dump_obss(char *buf, struct brcmf_dump_survey *survey)
+{
+	int i;
+	char *token;
+	char delim[] = "\n ";
+	unsigned long val;
+	int err = 0;
+
+	token = strsep(&buf, delim);
+	while (token) {
+		if (!strcmp(token, "OBSS")) {
+			for (i = 0; i < OBSS_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->obss = val;
+		}
+
+		if (!strcmp(token, "IBSS")) {
+			for (i = 0; i < IBSS_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->ibss = val;
+		}
+
+		if (!strcmp(token, "TXDur")) {
+			for (i = 0; i < TX_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->tx = val;
+		}
+
+		if (!strcmp(token, "Category")) {
+			for (i = 0; i < CTG_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->no_ctg = val;
+		}
+
+		if (!strcmp(token, "Packet")) {
+			for (i = 0; i < PKT_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->no_pckt = val;
+		}
+
+		if (!strcmp(token, "Opp(time):")) {
+			for (i = 0; i < IDLE_TOKEN_IDX; i++)
+				token = strsep(&buf, delim);
+			err = kstrtoul(token, 10, &val);
+			if (err)
+				break;
+			survey->idle = val;
+		}
+
+		token = strsep(&buf, delim);
+	}
+
+	return err;
+}
+
+static int
+brcmf_dump_obss(struct brcmf_if *ifp, struct cca_msrmnt_query req,
+		struct brcmf_dump_survey *survey)
+{
+	struct cca_stats_n_flags *results;
+	char *buf;
+	int err;
+
+	buf = kzalloc(sizeof(char) * BRCMF_DCMD_MEDLEN, GFP_KERNEL);
+	if (unlikely(!buf)) {
+		brcmf_err("%s: buf alloc failed\n", __func__);
+		return -ENOMEM;
+	}
+
+	memcpy(buf, &req, sizeof(struct cca_msrmnt_query));
+	err = brcmf_fil_iovar_data_get(ifp, "dump_obss",
+				       buf, BRCMF_DCMD_MEDLEN);
+	if (err < 0) {
+		brcmf_err("dump_obss error (%d)\n", err);
+		goto exit;
+	}
+	results = (struct cca_stats_n_flags *)(buf);
+
+	if (req.msrmnt_query)
+		brcmf_parse_dump_obss(results->buf, survey);
+
+	kfree(buf);
+	return 0;
+exit:
+	kfree(buf);
+	return -EINVAL;
+}
+
+static s32
+cfg80211_set_channel(struct wiphy *wiphy, struct net_device *dev,
+		     struct ieee80211_channel *chan,
+		     enum nl80211_channel_type channel_type)
+{
+	u16 chspec = 0;
+	int err = 0;
+	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
+	struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
+
+	/* set_channel */
+	chspec = channel_to_chanspec(&cfg->d11inf, chan);
+	if (chspec != INVCHANSPEC) {
+		err = brcmf_fil_iovar_int_set(ifp, "chanspec", chspec);
+		if (err) {
+			brcmf_err("set chanspec 0x%04x fail, reason %d\n", chspec, err);
+			err = -EINVAL;
+		}
+	} else {
+		brcmf_err("failed to convert host chanspec to fw chanspec\n");
+		err = -EINVAL;
+	}
+
+	return err;
+}
+
+static int
+brcmf_cfg80211_dump_survey(struct wiphy *wiphy, struct net_device *ndev,
+			   int idx, struct survey_info *info)
+{
+	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
+	struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
+	struct brcmf_dump_survey survey = {};
+	struct ieee80211_supported_band *band;
+	struct ieee80211_channel *chan;
+	struct cca_msrmnt_query req;
+	u32 val, noise;
+	int err;
+
+	brcmf_dbg(TRACE, "Enter: channel idx=%d\n", idx);
+
+	band = wiphy->bands[NL80211_BAND_2GHZ];
+	if (band && idx >= band->n_channels) {
+		idx -= band->n_channels;
+		band = NULL;
+	}
+
+	if (!band || idx >= band->n_channels) {
+		band = wiphy->bands[NL80211_BAND_5GHZ];
+		if (idx >= band->n_channels)
+			return -ENOENT;
+	}
+
+	/* Setting current channel to the requested channel */
+	chan = &band->channels[idx];
+	err = cfg80211_set_channel(wiphy, ndev, chan, NL80211_CHAN_HT20);
+	if (err) {
+		info->channel = chan;
+		info->filled = 0;
+		return 0;
+	}
+
+	if (!idx) {
+		/* Disable mpc */
+		val = 0;
+		brcmf_set_mpc(ifp, val);
+		/* Set interface up, explicitly. */
+		val = 1;
+		err = brcmf_fil_cmd_int_set(ifp, BRCMF_C_UP, val);
+		if (err) {
+			brcmf_err("BRCMF_C_UP error (%d)\n", err);
+			return -EIO;
+		}
+	}
+
+	/* Get noise value */
+	err = brcmf_fil_cmd_int_get(ifp, BRCMF_C_GET_PHY_NOISE, &noise);
+	if (err) {
+		brcmf_err("Get Phy Noise failed, error = %d\n", err);
+		noise = CHAN_NOISE_DUMMY;
+	}
+
+	/* Start Measurement for obss stats on current channel */
+	req.msrmnt_query = 0;
+	req.time_req = ACS_MSRMNT_DELAY;
+	err = brcmf_dump_obss(ifp, req, &survey);
+	if (err)
+		goto exit;
+
+	/* Add 10 ms for IOVAR completion */
+	msleep(ACS_MSRMNT_DELAY + 10);
+
+	/* Issue IOVAR to collect measurement results */
+	req.msrmnt_query = 1;
+	err = brcmf_dump_obss(ifp, req, &survey);
+	if (err < 0)
+		goto exit;
+
+	info->channel = chan;
+	info->noise = noise;
+	info->time = ACS_MSRMNT_DELAY;
+	info->time_busy = ACS_MSRMNT_DELAY - survey.idle;
+	info->time_rx = survey.obss + survey.ibss + survey.no_ctg +
+		survey.no_pckt;
+	info->time_tx = survey.tx;
+	info->filled = SURVEY_INFO_NOISE_DBM | SURVEY_INFO_TIME |
+		SURVEY_INFO_TIME_BUSY | SURVEY_INFO_TIME_RX |
+		SURVEY_INFO_TIME_TX;
+
+	brcmf_dbg(INFO, "OBSS dump: channel %d: survey duration %d\n",
+		  ieee80211_frequency_to_channel(chan->center_freq),
+		  ACS_MSRMNT_DELAY);
+	brcmf_dbg(INFO, "noise(%d) busy(%llu) rx(%llu) tx(%llu)\n",
+		  info->noise, info->time_busy, info->time_rx, info->time_tx);
+
+exit:
+	return err;
+}
+
 static void brcmf_cfg80211_reg_notifier(struct wiphy *wiphy,
 					struct regulatory_request *req)
 {
@@ -7676,6 +7929,9 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_GTK))
 		ops->set_rekey_data = brcmf_cfg80211_set_rekey_data;
 #endif
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_DUMP_OBSS))
+		ops->dump_survey = brcmf_cfg80211_dump_survey;
+
 	err = wiphy_register(wiphy);
 	if (err < 0) {
 		bphy_err(drvr, "Could not register wiphy device (%d)\n", err);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c

@@ -143,7 +143,7 @@ static void brcmf_feat_iovar_int_get(struct brcmf_if *ifp,
 	ifp->fwil_fwerr = true;
 
 	err = brcmf_fil_iovar_int_get(ifp, name, &data);
-	if (err == 0) {
+	if (err != -BRCMF_FW_UNSUPPORTED) {
 		brcmf_dbg(INFO, "enabling feature: %s\n", brcmf_feat_names[id]);
 		ifp->drvr->feat_flags |= BIT(id);
 	} else {
@@ -281,6 +281,7 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
 	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_RSDB, "rsdb_mode");
 	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_TDLS, "tdls_enable");
 	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_MFP, "mfp");
+	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_DUMP_OBSS, "dump_obss");
 
 	pfn_mac.version = BRCMF_PFN_MACADDR_CFG_VER;
 	err = brcmf_fil_iovar_data_get(ifp, "pfn_macaddr", &pfn_mac,

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h

@@ -29,6 +29,7 @@
  * DOT11H: firmware supports 802.11h
  * SAE: simultaneous authentication of equals
  * FWAUTH: Firmware authenticator
+ * DUMP_OBSS: Firmware has capable to dump obss info to support ACS
  */
 #define BRCMF_FEAT_LIST \
 	BRCMF_FEAT_DEF(MBSS) \
@@ -51,7 +52,8 @@
 	BRCMF_FEAT_DEF(MONITOR_FMT_HW_RX_HDR) \
 	BRCMF_FEAT_DEF(DOT11H) \
 	BRCMF_FEAT_DEF(SAE) \
-	BRCMF_FEAT_DEF(FWAUTH)
+	BRCMF_FEAT_DEF(FWAUTH) \
+	BRCMF_FEAT_DEF(DUMP_OBSS)
 
 /*
  * Quirks: