[GitHub/LineageOS/G12/android_hardware_amlogic_kernel-modules_dhd-driver.git] / bcmdhd.100.10.545.x / wl_roam.c

/*
 * Linux roam cache
 *
 * Copyright (C) 1999-2019, Broadcom.
 *
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 *
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 *
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 *
 *
 * <<Broadcom-WL-IPTag/Open:>>
 *
 * $Id: wl_roam.c 798173 2019-01-07 09:23:21Z $
 */

#include <typedefs.h>
#include <osl.h>
#include <bcmwifi_channels.h>
#include <wlioctl.h>
#include <bcmutils.h>
#ifdef WL_CFG80211
#include <wl_cfg80211.h>
#endif // endif
#include <wldev_common.h>
#include <bcmstdlib_s.h>

#ifdef ESCAN_CHANNEL_CACHE
#define MAX_ROAM_CACHE		200
#define MAX_SSID_BUFSIZE	36

#define ROAMSCAN_MODE_NORMAL	0
#define ROAMSCAN_MODE_WES		1

typedef struct {
	chanspec_t chanspec;
	int ssid_len;
	char ssid[MAX_SSID_BUFSIZE];
} roam_channel_cache;

static int n_roam_cache = 0;
static int roam_band = WLC_BAND_AUTO;
static roam_channel_cache roam_cache[MAX_ROAM_CACHE];
static uint band2G, band5G, band_bw;

#ifdef ROAM_CHANNEL_CACHE
int init_roam_cache(struct bcm_cfg80211 *cfg, int ioctl_ver)
{
	int err;
	struct net_device *dev = bcmcfg_to_prmry_ndev(cfg);
	s32 mode;

	/* Check support in firmware */
	err = wldev_iovar_getint(dev, "roamscan_mode", &mode);
	if (err && (err == BCME_UNSUPPORTED)) {
		/* If firmware doesn't support, return error. Else proceed */
		WL_ERR(("roamscan_mode iovar failed. %d\n", err));
		return err;
	}

#ifdef D11AC_IOTYPES
	if (ioctl_ver == 1) {
		/* legacy chanspec */
		band2G = WL_LCHANSPEC_BAND_2G;
		band5G = WL_LCHANSPEC_BAND_5G;
		band_bw = WL_LCHANSPEC_BW_20 | WL_LCHANSPEC_CTL_SB_NONE;
	} else {
		band2G = WL_CHANSPEC_BAND_2G;
		band5G = WL_CHANSPEC_BAND_5G;
		band_bw = WL_CHANSPEC_BW_20;
	}
#else
	band2G = WL_CHANSPEC_BAND_2G;
	band5G = WL_CHANSPEC_BAND_5G;
	band_bw = WL_CHANSPEC_BW_20 | WL_CHANSPEC_CTL_SB_NONE;
#endif /* D11AC_IOTYPES */

	n_roam_cache = 0;
	roam_band = WLC_BAND_AUTO;

	return 0;
}
#endif /* ROAM_CHANNEL_CACHE */

#ifdef ESCAN_CHANNEL_CACHE
void set_roam_band(int band)
{
	roam_band = band;
}

void reset_roam_cache(struct bcm_cfg80211 *cfg)
{
	if (!cfg->rcc_enabled) {
		return;
	}

	n_roam_cache = 0;
}

void add_roam_cache(struct bcm_cfg80211 *cfg, wl_bss_info_t *bi)
{
	int i;
	uint8 channel;
	char chanbuf[CHANSPEC_STR_LEN];

	if (!cfg->rcc_enabled) {
		return;
	}

	if (n_roam_cache >= MAX_ROAM_CACHE)
		return;

	for (i = 0; i < n_roam_cache; i++) {
		if ((roam_cache[i].ssid_len == bi->SSID_len) &&
			(roam_cache[i].chanspec == bi->chanspec) &&
			(memcmp(roam_cache[i].ssid, bi->SSID, bi->SSID_len) == 0)) {
			/* identical one found, just return */
			return;
		}
	}

	roam_cache[n_roam_cache].ssid_len = bi->SSID_len;
	channel = wf_chspec_ctlchan(bi->chanspec);
	WL_DBG(("CHSPEC  = %s, CTL %d\n", wf_chspec_ntoa_ex(bi->chanspec, chanbuf), channel));
	roam_cache[n_roam_cache].chanspec =
		(channel <= CH_MAX_2G_CHANNEL ? band2G : band5G) | band_bw | channel;
	(void)memcpy_s(roam_cache[n_roam_cache].ssid, bi->SSID_len, bi->SSID, bi->SSID_len);

	n_roam_cache++;
}

static bool is_duplicated_channel(const chanspec_t *channels, int n_channels, chanspec_t new)
{
	int i;

	for (i = 0; i < n_channels; i++) {
		if (channels[i] == new)
			return TRUE;
	}

	return FALSE;
}

int get_roam_channel_list(int target_chan,
	chanspec_t *channels, int n_channels, const wlc_ssid_t *ssid, int ioctl_ver)
{
	int i, n = 1;
	char chanbuf[CHANSPEC_STR_LEN];

	/* first index is filled with the given target channel */
	if (target_chan) {
		channels[0] = (target_chan & WL_CHANSPEC_CHAN_MASK) |
			(target_chan <= CH_MAX_2G_CHANNEL ? band2G : band5G) | band_bw;
	} else {
		/* If target channel is not provided, set the index to 0 */
		n = 0;
	}

	WL_DBG((" %s: %03d 0x%04X\n", __FUNCTION__, target_chan, channels[0]));

	for (i = 0; i < n_roam_cache; i++) {
		chanspec_t ch = roam_cache[i].chanspec;
		bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
		bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(ch) : CHSPEC_IS5G(ch);
		bool band_match = ((roam_band == WLC_BAND_AUTO) ||
			((roam_band == WLC_BAND_2G) && is_2G) ||
			((roam_band == WLC_BAND_5G) && is_5G));

		ch = CHSPEC_CHANNEL(ch) | (is_2G ? band2G : band5G) | band_bw;
		if ((roam_cache[i].ssid_len == ssid->SSID_len) &&
			band_match && !is_duplicated_channel(channels, n, ch) &&
			(memcmp(roam_cache[i].ssid, ssid->SSID, ssid->SSID_len) == 0)) {
			/* match found, add it */
			WL_DBG(("%s: Chanspec = %s\n", __FUNCTION__,
				wf_chspec_ntoa_ex(ch, chanbuf)));
			channels[n++] = ch;
			if (n >= n_channels) {
				WL_ERR(("Too many roam scan channels\n"));
				return n;
			}
		}
	}

	return n;
}
#endif /* ESCAN_CHANNEL_CACHE */

#ifdef ROAM_CHANNEL_CACHE
void print_roam_cache(struct bcm_cfg80211 *cfg)
{
	int i;

	if (!cfg->rcc_enabled) {
		return;
	}

	WL_DBG((" %d cache\n", n_roam_cache));

	for (i = 0; i < n_roam_cache; i++) {
		roam_cache[i].ssid[roam_cache[i].ssid_len] = 0;
		WL_DBG(("0x%02X %02d %s\n", roam_cache[i].chanspec,
			roam_cache[i].ssid_len, roam_cache[i].ssid));
	}
}

static void add_roamcache_channel(wl_roam_channel_list_t *channels, chanspec_t ch)
{
	int i;

	if (channels->n >= MAX_ROAM_CHANNEL) /* buffer full */
		return;

	for (i = 0; i < channels->n; i++) {
		if (channels->channels[i] == ch) /* already in the list */
			return;
	}

	channels->channels[i] = ch;
	channels->n++;

	WL_DBG((" RCC: %02d 0x%04X\n",
		ch & WL_CHANSPEC_CHAN_MASK, ch));
}

void update_roam_cache(struct bcm_cfg80211 *cfg, int ioctl_ver)
{
	int error, i, prev_channels;
	wl_roam_channel_list_t channel_list;
	char iobuf[WLC_IOCTL_SMLEN];
	struct net_device *dev = bcmcfg_to_prmry_ndev(cfg);
	wlc_ssid_t ssid;

	if (!cfg->rcc_enabled) {
		return;
	}

	if (!wl_get_drv_status(cfg, CONNECTED, dev)) {
		WL_DBG(("Not associated\n"));
		return;
	}

	/* need to read out the current cache list
	   as the firmware may change dynamically
	*/
	error = wldev_iovar_getbuf(dev, "roamscan_channels", 0, 0,
		(void *)&channel_list, sizeof(channel_list), NULL);
	if (error) {
		WL_ERR(("Failed to get roamscan channels, error = %d\n", error));
		return;
	}

	error = wldev_get_ssid(dev, &ssid);
	if (error) {
		WL_ERR(("Failed to get SSID, err=%d\n", error));
		return;
	}

	prev_channels = channel_list.n;
	for (i = 0; i < n_roam_cache; i++) {
		chanspec_t ch = roam_cache[i].chanspec;
		bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
		bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(ch) : CHSPEC_IS5G(ch);
		bool band_match = ((roam_band == WLC_BAND_AUTO) ||
			((roam_band == WLC_BAND_2G) && is_2G) ||
			((roam_band == WLC_BAND_5G) && is_5G));

		if ((roam_cache[i].ssid_len == ssid.SSID_len) &&
			band_match && (memcmp(roam_cache[i].ssid, ssid.SSID, ssid.SSID_len) == 0)) {
			/* match found, add it */
			ch = CHSPEC_CHANNEL(ch) | (is_2G ? band2G : band5G) | band_bw;
			add_roamcache_channel(&channel_list, ch);
		}
	}
	if (prev_channels != channel_list.n) {
		/* channel list updated */
		error = wldev_iovar_setbuf(dev, "roamscan_channels", &channel_list,
			sizeof(channel_list), iobuf, sizeof(iobuf), NULL);
		if (error) {
			WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
		}
	}

	WL_DBG(("%d AP, %d cache item(s), err=%d\n", n_roam_cache, channel_list.n, error));
}

void wl_update_roamscan_cache_by_band(struct net_device *dev, int band)
{
	int i, error, ioctl_ver, wes_mode;
	wl_roam_channel_list_t chanlist_before, chanlist_after;
	char iobuf[WLC_IOCTL_SMLEN];

	roam_band = band;

	error = wldev_iovar_getint(dev, "roamscan_mode", &wes_mode);
	if (error) {
		WL_ERR(("Failed to get roamscan mode, error = %d\n", error));
		return;
	}

	ioctl_ver = wl_cfg80211_get_ioctl_version();
	/* in case of WES mode, update channel list by band based on the cache in DHD */
	if (wes_mode) {
		int n = 0;
		chanlist_before.n = n_roam_cache;

		for (n = 0; n < n_roam_cache; n++) {
			chanspec_t ch = roam_cache[n].chanspec;
			bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
			chanlist_before.channels[n] = CHSPEC_CHANNEL(ch) |
				(is_2G ? band2G : band5G) | band_bw;
		}
	} else {
		if (band == WLC_BAND_AUTO) {
			return;
		}
		error = wldev_iovar_getbuf(dev, "roamscan_channels", 0, 0,
				(void *)&chanlist_before, sizeof(wl_roam_channel_list_t), NULL);
		if (error) {
			WL_ERR(("Failed to get roamscan channels, error = %d\n", error));
			return;
		}
	}
	chanlist_after.n = 0;
	/* filtering by the given band */
	for (i = 0; i < chanlist_before.n; i++) {
		chanspec_t chspec = chanlist_before.channels[i];
		bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(chspec) : CHSPEC_IS2G(chspec);
		bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(chspec) : CHSPEC_IS5G(chspec);
		bool band_match = ((band == WLC_BAND_AUTO) ||
				((band == WLC_BAND_2G) && is_2G) ||
				((band == WLC_BAND_5G) && is_5G));
		if (band_match) {
			chanlist_after.channels[chanlist_after.n++] = chspec;
		}
	}

	if (wes_mode) {
		/* need to set ROAMSCAN_MODE_NORMAL to update roamscan_channels,
		 * otherwise, it won't be updated
		 */
		wldev_iovar_setint(dev, "roamscan_mode", ROAMSCAN_MODE_NORMAL);

		error = wldev_iovar_setbuf(dev, "roamscan_channels", &chanlist_after,
				sizeof(wl_roam_channel_list_t), iobuf, sizeof(iobuf), NULL);
		if (error) {
			WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
		}
		wldev_iovar_setint(dev, "roamscan_mode", ROAMSCAN_MODE_WES);
	} else {
		if (chanlist_before.n == chanlist_after.n) {
			return;
		}
		error = wldev_iovar_setbuf(dev, "roamscan_channels", &chanlist_after,
				sizeof(wl_roam_channel_list_t), iobuf, sizeof(iobuf), NULL);
		if (error) {
			WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
		}
	}
}
#endif /* ROAM_CHANNEL_CACHE */
#endif /* ESCAN_CHANNEL_CACHE */
Commit	Line	Data
d2839953 RC	1	/*
	2	* Linux roam cache
	3	*
965f77c4	4	* Copyright (C) 1999-2019, Broadcom.
d2839953 RC	5	*
	6	* Unless you and Broadcom execute a separate written software license
	7	* agreement governing use of this software, this software is licensed to you
	8	* under the terms of the GNU General Public License version 2 (the "GPL"),
	9	* available at http://www.broadcom.com/licenses/GPLv2.php, with the
	10	* following added to such license:
	11	*
	12	* As a special exception, the copyright holders of this software give you
	13	* permission to link this software with independent modules, and to copy and
	14	* distribute the resulting executable under terms of your choice, provided that
	15	* you also meet, for each linked independent module, the terms and conditions of
	16	* the license of that module. An independent module is a module which is not
	17	* derived from this software. The special exception does not apply to any
	18	* modifications of the software.
	19	*
	20	* Notwithstanding the above, under no circumstances may you combine this
	21	* software in any way with any other Broadcom software provided under a license
	22	* other than the GPL, without Broadcom's express prior written consent.
	23	*
	24	*
	25	* <<Broadcom-WL-IPTag/Open:>>
	26	*
965f77c4	27	* $Id: wl_roam.c 798173 2019-01-07 09:23:21Z $
d2839953 RC	28	*/
	29
	30	#include <typedefs.h>
	31	#include <osl.h>
	32	#include <bcmwifi_channels.h>
	33	#include <wlioctl.h>
	34	#include <bcmutils.h>
	35	#ifdef WL_CFG80211
	36	#include <wl_cfg80211.h>
	37	#endif // endif
	38	#include <wldev_common.h>
965f77c4	39	#include <bcmstdlib_s.h>
d2839953 RC	40
	41	#ifdef ESCAN_CHANNEL_CACHE
	42	#define MAX_ROAM_CACHE 200
	43	#define MAX_SSID_BUFSIZE 36
	44
	45	#define ROAMSCAN_MODE_NORMAL 0
	46	#define ROAMSCAN_MODE_WES 1
	47
	48	typedef struct {
	49	chanspec_t chanspec;
	50	int ssid_len;
	51	char ssid[MAX_SSID_BUFSIZE];
	52	} roam_channel_cache;
	53
	54	static int n_roam_cache = 0;
	55	static int roam_band = WLC_BAND_AUTO;
	56	static roam_channel_cache roam_cache[MAX_ROAM_CACHE];
	57	static uint band2G, band5G, band_bw;
	58
	59	#ifdef ROAM_CHANNEL_CACHE
	60	int init_roam_cache(struct bcm_cfg80211 *cfg, int ioctl_ver)
	61	{
	62	int err;
	63	struct net_device *dev = bcmcfg_to_prmry_ndev(cfg);
	64	s32 mode;
	65
	66	/* Check support in firmware */
	67	err = wldev_iovar_getint(dev, "roamscan_mode", &mode);
	68	if (err && (err == BCME_UNSUPPORTED)) {
	69	/* If firmware doesn't support, return error. Else proceed */
	70	WL_ERR(("roamscan_mode iovar failed. %d\n", err));
	71	return err;
	72	}
	73
	74	#ifdef D11AC_IOTYPES
	75	if (ioctl_ver == 1) {
	76	/* legacy chanspec */
	77	band2G = WL_LCHANSPEC_BAND_2G;
	78	band5G = WL_LCHANSPEC_BAND_5G;
	79	band_bw = WL_LCHANSPEC_BW_20 \| WL_LCHANSPEC_CTL_SB_NONE;
	80	} else {
	81	band2G = WL_CHANSPEC_BAND_2G;
	82	band5G = WL_CHANSPEC_BAND_5G;
	83	band_bw = WL_CHANSPEC_BW_20;
	84	}
	85	#else
	86	band2G = WL_CHANSPEC_BAND_2G;
	87	band5G = WL_CHANSPEC_BAND_5G;
	88	band_bw = WL_CHANSPEC_BW_20 \| WL_CHANSPEC_CTL_SB_NONE;
	89	#endif /* D11AC_IOTYPES */
	90
	91	n_roam_cache = 0;
	92	roam_band = WLC_BAND_AUTO;
	93
	94	return 0;
	95	}
	96	#endif /* ROAM_CHANNEL_CACHE */
	97
	98	#ifdef ESCAN_CHANNEL_CACHE
	99	void set_roam_band(int band)
	100	{
	101	roam_band = band;
	102	}
	103
104	void reset_roam_cache(struct bcm_cfg80211 *cfg)
105	{
106	if (!cfg->rcc_enabled) {
107	return;
108	}
109
110	n_roam_cache = 0;
111	}
112
113	void add_roam_cache(struct bcm_cfg80211 cfg, wl_bss_info_t bi)
114	{
115	int i;
116	uint8 channel;
117	char chanbuf[CHANSPEC_STR_LEN];
118
119	if (!cfg->rcc_enabled) {
120	return;
121	}
122
123	if (n_roam_cache >= MAX_ROAM_CACHE)
124	return;
125
126	for (i = 0; i < n_roam_cache; i++) {
127	if ((roam_cache[i].ssid_len == bi->SSID_len) &&
128	(roam_cache[i].chanspec == bi->chanspec) &&
129	(memcmp(roam_cache[i].ssid, bi->SSID, bi->SSID_len) == 0)) {
130	/* identical one found, just return */
131	return;
132	}
133	}
134
135	roam_cache[n_roam_cache].ssid_len = bi->SSID_len;
136	channel = wf_chspec_ctlchan(bi->chanspec);
137	WL_DBG(("CHSPEC = %s, CTL %d\n", wf_chspec_ntoa_ex(bi->chanspec, chanbuf), channel));
138	roam_cache[n_roam_cache].chanspec =
139	(channel <= CH_MAX_2G_CHANNEL ? band2G : band5G) \| band_bw \| channel;
965f77c4	140	(void)memcpy_s(roam_cache[n_roam_cache].ssid, bi->SSID_len, bi->SSID, bi->SSID_len);
d2839953 RC	141
	142	n_roam_cache++;
	143	}
	144
	145	static bool is_duplicated_channel(const chanspec_t *channels, int n_channels, chanspec_t new)
	146	{
	147	int i;
	148
	149	for (i = 0; i < n_channels; i++) {
	150	if (channels[i] == new)
	151	return TRUE;
	152	}
	153
	154	return FALSE;
	155	}
	156
	157	int get_roam_channel_list(int target_chan,
	158	chanspec_t channels, int n_channels, const wlc_ssid_t ssid, int ioctl_ver)
	159	{
	160	int i, n = 1;
	161	char chanbuf[CHANSPEC_STR_LEN];
	162
	163	/* first index is filled with the given target channel */
	164	if (target_chan) {
	165	channels[0] = (target_chan & WL_CHANSPEC_CHAN_MASK) \|
	166	(target_chan <= CH_MAX_2G_CHANNEL ? band2G : band5G) \| band_bw;
	167	} else {
	168	/* If target channel is not provided, set the index to 0 */
	169	n = 0;
	170	}
	171
	172	WL_DBG((" %s: %03d 0x%04X\n", __FUNCTION__, target_chan, channels[0]));
	173
	174	for (i = 0; i < n_roam_cache; i++) {
	175	chanspec_t ch = roam_cache[i].chanspec;
	176	bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
	177	bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(ch) : CHSPEC_IS5G(ch);
	178	bool band_match = ((roam_band == WLC_BAND_AUTO) \|\|
	179	((roam_band == WLC_BAND_2G) && is_2G) \|\|
	180	((roam_band == WLC_BAND_5G) && is_5G));
	181
	182	ch = CHSPEC_CHANNEL(ch) \| (is_2G ? band2G : band5G) \| band_bw;
	183	if ((roam_cache[i].ssid_len == ssid->SSID_len) &&
	184	band_match && !is_duplicated_channel(channels, n, ch) &&
	185	(memcmp(roam_cache[i].ssid, ssid->SSID, ssid->SSID_len) == 0)) {
	186	/* match found, add it */
	187	WL_DBG(("%s: Chanspec = %s\n", __FUNCTION__,
	188	wf_chspec_ntoa_ex(ch, chanbuf)));
	189	channels[n++] = ch;
	190	if (n >= n_channels) {
	191	WL_ERR(("Too many roam scan channels\n"));
	192	return n;
	193	}
	194	}
	195	}
	196
	197	return n;
	198	}
	199	#endif /* ESCAN_CHANNEL_CACHE */
	200
	201	#ifdef ROAM_CHANNEL_CACHE
	202	void print_roam_cache(struct bcm_cfg80211 *cfg)
	203	{
	204	int i;
205
206	if (!cfg->rcc_enabled) {
207	return;
208	}
209
210	WL_DBG((" %d cache\n", n_roam_cache));
211
212	for (i = 0; i < n_roam_cache; i++) {
213	roam_cache[i].ssid[roam_cache[i].ssid_len] = 0;
214	WL_DBG(("0x%02X %02d %s\n", roam_cache[i].chanspec,
215	roam_cache[i].ssid_len, roam_cache[i].ssid));
216	}
217	}
218
219	static void add_roamcache_channel(wl_roam_channel_list_t *channels, chanspec_t ch)
220	{
221	int i;
222
223	if (channels->n >= MAX_ROAM_CHANNEL) /* buffer full */
224	return;
225
226	for (i = 0; i < channels->n; i++) {
227	if (channels->channels[i] == ch) /* already in the list */
228	return;
229	}
230
231	channels->channels[i] = ch;
232	channels->n++;
233
234	WL_DBG((" RCC: %02d 0x%04X\n",
235	ch & WL_CHANSPEC_CHAN_MASK, ch));
236	}
237
238	void update_roam_cache(struct bcm_cfg80211 *cfg, int ioctl_ver)
239	{
240	int error, i, prev_channels;
241	wl_roam_channel_list_t channel_list;
242	char iobuf[WLC_IOCTL_SMLEN];
243	struct net_device *dev = bcmcfg_to_prmry_ndev(cfg);
244	wlc_ssid_t ssid;
245
246	if (!cfg->rcc_enabled) {
247	return;
248	}
249
250	if (!wl_get_drv_status(cfg, CONNECTED, dev)) {
251	WL_DBG(("Not associated\n"));
252	return;
253	}
254
255	/* need to read out the current cache list
256	as the firmware may change dynamically
257	*/
258	error = wldev_iovar_getbuf(dev, "roamscan_channels", 0, 0,
259	(void *)&channel_list, sizeof(channel_list), NULL);
260	if (error) {
261	WL_ERR(("Failed to get roamscan channels, error = %d\n", error));
262	return;
263	}
264
265	error = wldev_get_ssid(dev, &ssid);
266	if (error) {
267	WL_ERR(("Failed to get SSID, err=%d\n", error));
268	return;
269	}
270
271	prev_channels = channel_list.n;
272	for (i = 0; i < n_roam_cache; i++) {
273	chanspec_t ch = roam_cache[i].chanspec;
274	bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
275	bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(ch) : CHSPEC_IS5G(ch);
276	bool band_match = ((roam_band == WLC_BAND_AUTO) \|\|
277	((roam_band == WLC_BAND_2G) && is_2G) \|\|
278	((roam_band == WLC_BAND_5G) && is_5G));
279
280	if ((roam_cache[i].ssid_len == ssid.SSID_len) &&
281	band_match && (memcmp(roam_cache[i].ssid, ssid.SSID, ssid.SSID_len) == 0)) {
282	/* match found, add it */
283	ch = CHSPEC_CHANNEL(ch) \| (is_2G ? band2G : band5G) \| band_bw;
284	add_roamcache_channel(&channel_list, ch);
285	}
286	}
287	if (prev_channels != channel_list.n) {
288	/* channel list updated */
289	error = wldev_iovar_setbuf(dev, "roamscan_channels", &channel_list,
290	sizeof(channel_list), iobuf, sizeof(iobuf), NULL);
291	if (error) {
292	WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
293	}
294	}
295
296	WL_DBG(("%d AP, %d cache item(s), err=%d\n", n_roam_cache, channel_list.n, error));
297	}
298
299	void wl_update_roamscan_cache_by_band(struct net_device *dev, int band)
300	{
301	int i, error, ioctl_ver, wes_mode;
302	wl_roam_channel_list_t chanlist_before, chanlist_after;
303	char iobuf[WLC_IOCTL_SMLEN];
304
305	roam_band = band;
306
307	error = wldev_iovar_getint(dev, "roamscan_mode", &wes_mode);
308	if (error) {
309	WL_ERR(("Failed to get roamscan mode, error = %d\n", error));
310	return;
311	}
312
313	ioctl_ver = wl_cfg80211_get_ioctl_version();
314	/* in case of WES mode, update channel list by band based on the cache in DHD */
315	if (wes_mode) {
316	int n = 0;
317	chanlist_before.n = n_roam_cache;
318
319	for (n = 0; n < n_roam_cache; n++) {
320	chanspec_t ch = roam_cache[n].chanspec;
321	bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(ch) : CHSPEC_IS2G(ch);
322	chanlist_before.channels[n] = CHSPEC_CHANNEL(ch) \|
323	(is_2G ? band2G : band5G) \| band_bw;
324	}
325	} else {
326	if (band == WLC_BAND_AUTO) {
327	return;
328	}
329	error = wldev_iovar_getbuf(dev, "roamscan_channels", 0, 0,
330	(void *)&chanlist_before, sizeof(wl_roam_channel_list_t), NULL);
331	if (error) {
332	WL_ERR(("Failed to get roamscan channels, error = %d\n", error));
333	return;
334	}
335	}
336	chanlist_after.n = 0;
337	/* filtering by the given band */
338	for (i = 0; i < chanlist_before.n; i++) {
339	chanspec_t chspec = chanlist_before.channels[i];
340	bool is_2G = ioctl_ver == 1 ? LCHSPEC_IS2G(chspec) : CHSPEC_IS2G(chspec);
341	bool is_5G = ioctl_ver == 1 ? LCHSPEC_IS5G(chspec) : CHSPEC_IS5G(chspec);
342	bool band_match = ((band == WLC_BAND_AUTO) \|\|
343	((band == WLC_BAND_2G) && is_2G) \|\|
344	((band == WLC_BAND_5G) && is_5G));
345	if (band_match) {
346	chanlist_after.channels[chanlist_after.n++] = chspec;
347	}
348	}
349
350	if (wes_mode) {
351	/* need to set ROAMSCAN_MODE_NORMAL to update roamscan_channels,
352	* otherwise, it won't be updated
353	*/
354	wldev_iovar_setint(dev, "roamscan_mode", ROAMSCAN_MODE_NORMAL);
355
356	error = wldev_iovar_setbuf(dev, "roamscan_channels", &chanlist_after,
357	sizeof(wl_roam_channel_list_t), iobuf, sizeof(iobuf), NULL);
358	if (error) {
359	WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
360	}
361	wldev_iovar_setint(dev, "roamscan_mode", ROAMSCAN_MODE_WES);
362	} else {
363	if (chanlist_before.n == chanlist_after.n) {
364	return;
365	}
366	error = wldev_iovar_setbuf(dev, "roamscan_channels", &chanlist_after,
367	sizeof(wl_roam_channel_list_t), iobuf, sizeof(iobuf), NULL);
368	if (error) {
369	WL_ERR(("Failed to update roamscan channels, error = %d\n", error));
370	}
371	}
372	}
373	#endif /* ROAM_CHANNEL_CACHE */
374	#endif /* ESCAN_CHANNEL_CACHE */