diff mbox series

[v2,2/2] wifi: mac80211: Refactor STA CSA parsing flow

Message ID 20231113021107.13110-2-michael-cy.lee@mediatek.com
State New
Headers show
Series [v2,1/2] wifi: mac80211: Add utilities for converting op_class | expand

Commit Message

Michael-CY Lee Nov. 13, 2023, 2:11 a.m. UTC 
The Wi-Fi Standard (IEEE 802.11-2020 9.4.2.160) initially specified that
the Wide Bandwidth Channel Switch (WBCS) IE subfields have same definitions
as the S1G or VHT Operation Information according to the operating band.

However, it did not change the definitions in the amendment for 6 GHz
(IEEE 802.11ax-2021), so the logic remain the same for handling the WBCS
IE even if there is no VHT mode in 6 GHz.

Now the Wi-Fi Standard draft (IEEE P80211be D3.2 9.4.2.159) modifies the
defitions, making the WBCS IE subfields follow the definitions of S1G,
VHT and HE Operation Information in S1G, 5 GHz and 6 GHz band, respectively.

APs in 6 GHz band might use the VHT or HE Operation Information to build
a WBCS IE according to the Wi-Fi Standard they follow. Originally, the STA
just parsed the WBCS IE as VHT Operation Inforamtion, which was wrong if
the AP was actually build the IE by the HE Operation Information.

To avoid the ambiguity, STA should prefer the op_class in the Extended
Channel Switch Announcement (ECSA) IE rathen than the WBCS IE. If the ECSA
IE is not presented in a channel switch to 6 GHz, the STA should be aware
of the possible ambiguity when parsing the WBCS IE.

To derive the correct bandwidtin in use, the STA should check the
combination of new channel width, ccfs0 and ccfs1, see the following
table:

| width|          ccfs1|            ccfs2| new BW in MHz|
---------------------------------------------------------
|     0|    center freq|                0|            40|
|     1|    center freq|                0|            80|
|     1| primary 80 MHz| secondary 80 MHz|         80P80|
|     1| primary 80 MHz|      center freq|           160|
|     1|    center freq|                0|            40|
|     2|    center freq|                0|           160|
|     2|    center freq|                0|            80|
|     3| primary 80 MHz| secondary 80 MHz|         80P80|
|     3| primary 80 MHz|      center freq|           160|

This patch refactors the STA parsing CSA flow:

1. If the BWI IE is not presented while the ECSA IE is presented, this
   patch uses the subfield op_class to build the HT, VHT and HE operation
   in 2.4 GHz, 5 GHz and 6 GHz band, respectively.
2. If the BWI and ECSA IE are NOT presented while the WBCS IE is presented,
   the new channel width is at least 40 MHz.
   Therefore this patch first prepares a 40 MHz chandef, then builds the
   HT, VHT and HE operation in 2 GHz, 5 GHz and 6 GHz band, respectively.
   In the 6 GHz band, this patch checks the combination of new channel
   width, ccfs0 and ccfs1 to build the correct HE operation.
3. From the HT/VHT/HE operation created in step 1 or 2, this patch then
   creates the chandef and assigns it to csa_ie.

Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com>
Signed-off-by: Money Wang <money.wang@mediatek.com>
---
 net/mac80211/spectmgmt.c | 512 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 456 insertions(+), 56 deletions(-)

Comments

Johannes Berg Nov. 24, 2023, 7:31 p.m. UTC | #1 
On Mon, 2023-11-13 at 10:11 +0800, Michael-CY Lee wrote:
> 
> +	new_chan_width = ieee80211_operating_class_to_chan_width(op_class);
> +	if (!ieee80211_operating_class_to_center_freq(op_class, chan,
> +						      &center_freq1,
> +						      &center_freq2)) {

Unless I missed it, I see two places here calling it together, so seems
reasonable to fill in a chandef here instead?

> +	new_chan_width = ieee80211_operating_class_to_chan_width(op_class);
> +	if (!ieee80211_operating_class_to_center_freq(op_class, chan,
> +						      &center_freq1,
> +						      &center_freq2)) {


Here you have it too.


> +		new_chan_width = NL80211_CHAN_WIDTH_20;
> +		center_freq1 = chan->center_freq;

And actually you could just have a chandef created with

    cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_WIDTH_20)

which mirrors the failure case here, and just not update it when
something like

    ieee80211_update_chandef_from_op_class(op_class, &chandef)

returned false (not that I necessarily think that name should be used.)

Or just pass the channel, and make it create one with WIDTH_20 in the
failure case?

    ieee80211_create_chandef_from_opclass(chan, op_class, &chandef);

which is is maybe even nicer?

I'm also not quite sure why you're converting to operation elements
first?

johannes
Michael-CY Lee Nov. 27, 2023, 3:15 a.m. UTC | #2 
Hi Johannes,

On Fri, 2023-11-24 at 20:31 +0100, Johannes Berg wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On Mon, 2023-11-13 at 10:11 +0800, Michael-CY Lee wrote:
> > 
> > +new_chan_width =
> ieee80211_operating_class_to_chan_width(op_class);
> > +if (!ieee80211_operating_class_to_center_freq(op_class, chan,
> > +      &center_freq1,
> > +      &center_freq2)) {
> 
> Unless I missed it, I see two places here calling it together, so
> seems
> reasonable to fill in a chandef here instead?
> 
> > +new_chan_width =
> ieee80211_operating_class_to_chan_width(op_class);
> > +if (!ieee80211_operating_class_to_center_freq(op_class, chan,
> > +      &center_freq1,
> > +      &center_freq2)) {
> 
> 
> Here you have it too.
> 
> 
> > +new_chan_width = NL80211_CHAN_WIDTH_20;
> > +center_freq1 = chan->center_freq;
> 
> And actually you could just have a chandef created with
> 
>     cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_WIDTH_20)
> 
> which mirrors the failure case here, and just not update it when
> something like
> 
>     ieee80211_update_chandef_from_op_class(op_class, &chandef)
> 
> returned false (not that I necessarily think that name should be
> used.)
> 
> Or just pass the channel, and make it create one with WIDTH_20 in the
> failure case?
> 
>     ieee80211_create_chandef_from_opclass(chan, op_class, &chandef);
> 
> which is is maybe even nicer?

Good suggestion!
We'll decide which one is better.

> 
> I'm also not quite sure why you're converting to operation elements
> first?

The old flow also converted the Element to operation elements first,
then it used ieee80211_chandef_vht_oper() to build the new chandef from
operation elements.

We think it's necessary for the case that AP is trying to switch to a
160 MHz bandwidth, while the STA doesn't support the 160 MHz bandwidth.

Just like what had been done during the association,
ieee80211_chandef_vht_oper() checks the STA's capabilities and builds a
valid chandef for the STA. However, even if the STA doesn't support the
160 MHz bandwidth, ieee80211_chandef_vht_oper() doesn't mark the
conn_flags as IEEE80211_CONN_DISABLE_160MHZ, so the same check is
necessary when handling CSA.

Like we had discussed in previous mail, we expected the patch will be
simplified.
In summary, the steps for STA to handling CSA are, 
1. parse the new channel information from either operating class or
WBCS Element.
2. convert the channel information into corresponding operation Element
(HT/VHT in 5 GHz band and HE/EHT in 6 GHz band)
3. Build a valid chandef from the operation Element.

> 
> johannes

Best, 
Micahel
>
Johannes Berg Nov. 27, 2023, 10:02 a.m. UTC | #3 
Hi,

> The old flow also converted the Element to operation elements first,
> then it used ieee80211_chandef_vht_oper() to build the new chandef from
> operation elements.
> 
> We think it's necessary for the case that AP is trying to switch to a
> 160 MHz bandwidth, while the STA doesn't support the 160 MHz bandwidth.

Yeah, you're right, it did before and I suppose it's still easier than
managing two conversions, since some formats are the same.

> Just like what had been done during the association,
> ieee80211_chandef_vht_oper() checks the STA's capabilities and builds a
> valid chandef for the STA. However, even if the STA doesn't support the
> 160 MHz bandwidth, ieee80211_chandef_vht_oper() doesn't mark the
> conn_flags as IEEE80211_CONN_DISABLE_160MHZ, so the same check is
> necessary when handling CSA.

Right.

> Like we had discussed in previous mail, we expected the patch will be
> simplified.

Yeah I just circled back to it for stupid reasons (I guess mostly forgot
to mark in patchwork that you were going to make changes) and looked
again after having looked at all the other code in the series I posted
late last week.

> In summary, the steps for STA to handling CSA are, 
> 1. parse the new channel information from either operating class or
> WBCS Element.
> 2. convert the channel information into corresponding operation Element
> (HT/VHT in 5 GHz band and HE/EHT in 6 GHz band)
> 3. Build a valid chandef from the operation Element.
> 

Sounds good.

johannes
diff mbox series

Patch

diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c
index 55959b0b24c5..39441a4955eb 100644
--- a/net/mac80211/spectmgmt.c
+++ b/net/mac80211/spectmgmt.c
@@ -19,6 +19,332 @@ 
 #include "sta_info.h"
 #include "wme.h"
 
+static inline void
+op_class_to_6ghz_he_eht_oper(u8 op_class, struct ieee80211_channel *chan,
+			     struct ieee80211_he_operation *he_oper,
+			     struct ieee80211_eht_operation *eht_oper)
+{
+	u8 new_chan_width;
+	u32 he_oper_params, center_freq1 = 0, center_freq2 = 0;
+	struct ieee80211_he_6ghz_oper *he_6ghz_oper;
+	struct ieee80211_eht_operation_info *eht_oper_info;
+
+	new_chan_width = ieee80211_operating_class_to_chan_width(op_class);
+	if (!ieee80211_operating_class_to_center_freq(op_class, chan,
+						      &center_freq1,
+						      &center_freq2)) {
+		new_chan_width = NL80211_CHAN_WIDTH_20;
+		center_freq1 = chan->center_freq;
+	}
+
+	he_oper_params =
+		u32_encode_bits(1, IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
+	he_oper->he_oper_params = cpu_to_le32(he_oper_params);
+
+	he_6ghz_oper = (struct ieee80211_he_6ghz_oper *)he_oper->optional;
+	he_6ghz_oper->primary =
+		ieee80211_frequency_to_channel(chan->center_freq);
+	he_6ghz_oper->ccfs0 = ieee80211_frequency_to_channel(center_freq1);
+	he_6ghz_oper->ccfs1 = center_freq2 ?
+		ieee80211_frequency_to_channel(center_freq2) : 0;
+
+	switch (new_chan_width) {
+	case NL80211_CHAN_WIDTH_320:
+		/* Cannot derive center frequency of 320 MHZ from op_class
+		 * since it might be 320 Mhz-1 or 320 Mhz-2.
+		 */
+		WARN_ON(1);
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		he_6ghz_oper->ccfs1 = he_6ghz_oper->ccfs0;
+		he_6ghz_oper->ccfs0 += chan->center_freq < center_freq1 ? -8 : 8;
+		fallthrough;
+	case NL80211_CHAN_WIDTH_80P80:
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
+		break;
+	case NL80211_CHAN_WIDTH_40:
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
+		break;
+	default:
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
+		break;
+	}
+
+	eht_oper->params = IEEE80211_EHT_OPER_INFO_PRESENT;
+
+	eht_oper_info =
+		(struct ieee80211_eht_operation_info *)eht_oper->optional;
+	eht_oper_info->control = he_6ghz_oper->control;
+	eht_oper_info->ccfs0 = he_6ghz_oper->ccfs0;
+	eht_oper_info->ccfs1 = he_6ghz_oper->ccfs1;
+}
+
+static inline void
+wbcs_ie_to_6ghz_he_eht_oper(const struct ieee80211_wide_bw_chansw_ie *wbcs_ie,
+			    u8 new_chan_no,
+			    struct ieee80211_he_operation *he_oper,
+			    struct ieee80211_eht_operation *eht_oper)
+{
+	u32 he_oper_params;
+	struct ieee80211_he_6ghz_oper *he_6ghz_oper;
+	struct ieee80211_eht_operation_info *eht_oper_info;
+	bool fallback_20mhz;
+	u8 ccfs_diff;
+
+	he_oper_params =
+		u32_encode_bits(1, IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
+	he_oper->he_oper_params = cpu_to_le32(he_oper_params);
+
+	he_6ghz_oper = (struct ieee80211_he_6ghz_oper *)he_oper->optional;
+	he_6ghz_oper->primary = new_chan_no;
+
+	/* The Wide Bandwidth Channel Switch IE in a 6 GHz BSS migth be
+	 * deprecated VHT operation, VHT operation (IEEE 802.11-2020 9.4.2.160)
+	 * or HE operation (IEEE P80211be D3.2 9.4.2.159).
+	 * Check the combination of width, ccfs0 and ccfs1 to build the correct
+	 * HE/EHT operation.
+	 */
+	he_6ghz_oper->ccfs0 = wbcs_ie->new_center_freq_seg0;
+	he_6ghz_oper->ccfs1 = wbcs_ie->new_center_freq_seg1;
+	switch (wbcs_ie->new_channel_width) {
+	case 0:
+		/* Must be [deprecated] VHT operation with 40 MHz bandwidth */
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
+		break;
+	case 1:
+		if (he_6ghz_oper->ccfs1) {
+			/* VHT operation with 160/80P80 MHz bandwidth */
+			he_6ghz_oper->control =
+				IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
+		} else if ((he_6ghz_oper->ccfs0 - 7) % 16 == 0) {
+			/* [deprecated] VHT operation with 80 MHz bandwidth */
+			he_6ghz_oper->control =
+				IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
+		} else {
+			/* HE operation with 40 MHz bandwidth */
+			he_6ghz_oper->control =
+				IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
+		}
+		break;
+	case 2:
+		if ((he_6ghz_oper->ccfs0 - 15) % 32 == 0) {
+			/* deprecated VHT operation with 160 MHz bandwidth */
+			he_6ghz_oper->control =
+				IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
+			he_6ghz_oper->ccfs1 = he_6ghz_oper->ccfs0;
+			he_6ghz_oper->ccfs0 +=
+				new_chan_no < he_6ghz_oper->ccfs0 ? -8 : 8;
+		} else {
+			/* HE operation with 80 MHz bandwidth */
+			he_6ghz_oper->control =
+				IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
+		}
+		break;
+	case 3:
+		/* Can be
+		 * 1. deprecated VHT operation with 80P80 MHz bandwidth
+		 * 2. HE operation with 160/80P80 MHz bandwidth
+		 */
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
+		break;
+	case 4:
+		/* 320 MHz bandwidth
+		 * TODO channel switch to 320 MHz bandwidth should be indiated
+		 * by Bandwidth Indication IE (IEEE P80211be D3.2 9.4.2.159)
+		 */
+		he_6ghz_oper->control = IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ;
+		break;
+	default:
+		/* Ignore invalid width */
+		break;
+	}
+
+	/* Validate the relationship between new channel width and center frequency
+	 * segments, and fallback to 20 MHz if the relationship is wrong.
+	 */
+	fallback_20mhz = false;
+	switch (he_6ghz_oper->control) {
+	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ:
+		if ((he_6ghz_oper->ccfs0 - 3) % 8 != 0)
+			fallback_20mhz = true;
+		break;
+	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ:
+		if ((he_6ghz_oper->ccfs0 - 7) % 16 != 0)
+			fallback_20mhz = true;
+		break;
+	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ:
+		ccfs_diff = abs(he_6ghz_oper->ccfs1 - he_6ghz_oper->ccfs0);
+		if ((ccfs_diff == 8 && (he_6ghz_oper->ccfs1 - 15) % 32 != 0) ||
+		    (ccfs_diff > 16 && ((he_6ghz_oper->ccfs0 - 7) % 16 != 0 ||
+		    (he_6ghz_oper->ccfs1 - 7) % 16 != 0)))
+			fallback_20mhz = true;
+		break;
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ:
+		if ((he_6ghz_oper->ccfs1 - 31) % 32 != 0)
+			fallback_20mhz = true;
+		break;
+	}
+
+	if (fallback_20mhz) {
+		he_6ghz_oper->control =
+			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
+		he_6ghz_oper->ccfs0 = he_6ghz_oper->primary;
+		he_6ghz_oper->ccfs1 = 0;
+	}
+
+	eht_oper->params = IEEE80211_EHT_OPER_INFO_PRESENT;
+	eht_oper_info =
+		(struct ieee80211_eht_operation_info *)eht_oper->optional;
+	eht_oper_info->control = he_6ghz_oper->control;
+	eht_oper_info->ccfs0 = he_6ghz_oper->ccfs0;
+	eht_oper_info->ccfs1 = he_6ghz_oper->ccfs1;
+}
+
+static inline void
+op_class_to_ht_vht_oper(u8 op_class, struct ieee80211_channel *chan,
+			struct ieee80211_ht_operation *ht_oper,
+			struct ieee80211_vht_operation *vht_oper)
+{
+	u8 new_chan_width;
+	u32 center_freq1 = 0, center_freq2 = 0;
+
+	new_chan_width = ieee80211_operating_class_to_chan_width(op_class);
+	if (!ieee80211_operating_class_to_center_freq(op_class, chan,
+						      &center_freq1,
+						      &center_freq2)) {
+		new_chan_width = NL80211_CHAN_WIDTH_20;
+		center_freq1 = chan->center_freq;
+	}
+
+	vht_oper->center_freq_seg0_idx =
+		ieee80211_frequency_to_channel(center_freq1);
+	vht_oper->center_freq_seg1_idx = center_freq2 ?
+		ieee80211_frequency_to_channel(center_freq2) : 0;
+
+	ht_oper->ht_param = (chan->center_freq / 20) & 1 ?
+				IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
+				IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+
+	switch (new_chan_width) {
+	case NL80211_CHAN_WIDTH_320:
+		WARN_ON(1);
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
+		vht_oper->center_freq_seg1_idx = vht_oper->center_freq_seg0_idx;
+		vht_oper->center_freq_seg0_idx +=
+			chan->center_freq < center_freq1 ? -8 : 8;
+		break;
+	case NL80211_CHAN_WIDTH_80P80:
+		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
+		break;
+	default:
+		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
+		if (chan->center_freq != center_freq1)
+			ht_oper->ht_param = chan->center_freq > center_freq1 ?
+				IEEE80211_HT_PARAM_CHA_SEC_BELOW :
+				IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
+		else
+			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
+	}
+
+	ht_oper->operation_mode =
+		cpu_to_le16(vht_oper->center_freq_seg1_idx <<
+				IEEE80211_HT_OP_MODE_CCFS2_SHIFT);
+}
+
+static inline void
+wbcs_ie_to_ht_vht_oper(struct ieee80211_channel *chan,
+		       const struct ieee80211_wide_bw_chansw_ie *wbcs_ie,
+		       struct ieee80211_ht_operation *ht_oper,
+		       struct ieee80211_vht_operation *vht_oper)
+{
+	u8 new_chan_width, new_ccfs0, new_ccfs1;
+	bool fallback_20mhz;
+
+	new_chan_width = wbcs_ie->new_channel_width;
+	new_ccfs0 = wbcs_ie->new_center_freq_seg0;
+	new_ccfs1 = wbcs_ie->new_center_freq_seg1;
+
+	/* Validate the relationship between new channel width and center frequency
+	 * segments, and fallback to 20 MHz if the relationship is wrong.
+	 */
+	fallback_20mhz = false;
+	switch (new_chan_width) {
+	case IEEE80211_VHT_CHANWIDTH_USE_HT:
+		/* If the wide bandwidth channel switch IE is presented,
+		 * the new channel width is at least 40 MHz.
+		 */
+		if (!new_ccfs1) {
+			new_ccfs0 -= (new_ccfs0 >= 149) ? 151 : 38;
+			if (new_ccfs0 % 8 != 0)
+				fallback_20mhz = true;
+		} else {
+			fallback_20mhz = true;
+		}
+		break;
+	case IEEE80211_VHT_CHANWIDTH_80MHZ:
+		if (!new_ccfs1) {
+			new_ccfs0 -= (new_ccfs0 >= 149) ? 155 : 42;
+			if (new_ccfs0 % 16 != 0)
+				fallback_20mhz = true;
+			break;
+		} else if (abs(new_ccfs1 - new_ccfs0) == 8) {
+			new_ccfs0 = new_ccfs1;
+			new_ccfs1 = 0;
+		}
+		fallthrough;
+	case IEEE80211_VHT_CHANWIDTH_160MHZ:
+		if (!new_ccfs1) {
+			if (new_ccfs0 != 50 && new_ccfs0 != 114 && new_ccfs0 != 163)
+				fallback_20mhz = true;
+			break;
+		}
+		fallthrough;
+	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
+		new_ccfs0 -= (new_ccfs0 >= 149) ? 155 : 42;
+		new_ccfs1 -= (new_ccfs1 >= 149) ? 155 : 42;
+		if (new_ccfs0 % 16 != 0 || new_ccfs1 % 16 != 0)
+			fallback_20mhz = true;
+		break;
+	default:
+		fallback_20mhz = true;
+	}
+
+	if (fallback_20mhz) {
+		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
+
+		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
+		vht_oper->center_freq_seg0_idx =
+			ieee80211_frequency_to_channel(chan->center_freq);
+		vht_oper->center_freq_seg1_idx = 0;
+
+	} else {
+		ht_oper->ht_param = (chan->center_freq / 20) & 1 ?
+					IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
+					IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+
+		vht_oper->chan_width = new_chan_width;
+		vht_oper->center_freq_seg0_idx = wbcs_ie->new_center_freq_seg0;
+		vht_oper->center_freq_seg1_idx = wbcs_ie->new_center_freq_seg1;
+	}
+
+	ht_oper->operation_mode = cpu_to_le16(vht_oper->center_freq_seg1_idx <<
+					      IEEE80211_HT_OP_MODE_CCFS2_SHIFT);
+}
+
 int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
 				 struct ieee802_11_elems *elems,
 				 enum nl80211_band current_band,
@@ -26,14 +352,21 @@  int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
 				 ieee80211_conn_flags_t conn_flags, u8 *bssid,
 				 struct ieee80211_csa_ie *csa_ie)
 {
+	struct ieee80211_supported_band *sband;
 	enum nl80211_band new_band = current_band;
-	int new_freq;
-	u8 new_chan_no;
+	int new_freq, size;
+	u8 new_chan_no = 0, new_op_class = 0;
 	struct ieee80211_channel *new_chan;
-	struct cfg80211_chan_def new_vht_chandef = {};
+	struct cfg80211_chan_def new_chandef = {};
 	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
 	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
 	const struct ieee80211_bandwidth_indication *bwi;
+	const struct ieee80211_ext_chansw_ie *ext_chansw_ie;
+	struct ieee80211_ht_operation *ht_oper;
+	struct ieee80211_vht_operation *vht_oper;
+	struct ieee80211_he_operation *he_oper;
+	struct ieee80211_eht_operation *eht_oper;
+	struct ieee80211_sta_ht_cap sta_ht_cap;
 	int secondary_channel_offset = -1;
 
 	memset(csa_ie, 0, sizeof(*csa_ie));
@@ -41,6 +374,7 @@  int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
 	sec_chan_offs = elems->sec_chan_offs;
 	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
 	bwi = elems->bandwidth_indication;
+	ext_chansw_ie = elems->ext_chansw_ie;
 
 	if (conn_flags & (IEEE80211_CONN_DISABLE_HT |
 			  IEEE80211_CONN_DISABLE_40MHZ)) {
@@ -48,29 +382,30 @@  int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
 		wide_bw_chansw_ie = NULL;
 	}
 
-	if (conn_flags & IEEE80211_CONN_DISABLE_VHT)
-		wide_bw_chansw_ie = NULL;
-
-	if (elems->ext_chansw_ie) {
-		if (!ieee80211_operating_class_to_band(
-				elems->ext_chansw_ie->new_operating_class,
-				&new_band)) {
-			sdata_info(sdata,
-				   "cannot understand ECSA IE operating class, %d, ignoring\n",
-				   elems->ext_chansw_ie->new_operating_class);
+	if (ext_chansw_ie) {
+		new_op_class = ext_chansw_ie->new_operating_class;
+		if (!ieee80211_operating_class_to_band(new_op_class, &new_band)) {
+			new_op_class = 0;
+			sdata_info(sdata, "cannot understand ECSA IE "
+					  "operating class, %d, ignoring\n",
+				   ext_chansw_ie->new_operating_class);
+		} else {
+			new_chan_no = ext_chansw_ie->new_ch_num;
+			csa_ie->count = ext_chansw_ie->count;
+			csa_ie->mode = ext_chansw_ie->mode;
 		}
-		new_chan_no = elems->ext_chansw_ie->new_ch_num;
-		csa_ie->count = elems->ext_chansw_ie->count;
-		csa_ie->mode = elems->ext_chansw_ie->mode;
-	} else if (elems->ch_switch_ie) {
+	}
+
+	if (!new_op_class && elems->ch_switch_ie) {
 		new_chan_no = elems->ch_switch_ie->new_ch_num;
 		csa_ie->count = elems->ch_switch_ie->count;
 		csa_ie->mode = elems->ch_switch_ie->mode;
-	} else {
-		/* nothing here we understand */
-		return 1;
 	}
 
+	/* nothing here we understand */
+	if (!new_chan_no)
+		return 1;
+
 	/* Mesh Channel Switch Parameters Element */
 	if (elems->mesh_chansw_params_ie) {
 		csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
@@ -136,59 +471,124 @@  int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
 
 	if (bwi) {
 		/* start with the CSA one */
-		new_vht_chandef = csa_ie->chandef;
+		new_chandef = csa_ie->chandef;
 		/* and update the width accordingly */
 		/* FIXME: support 160/320 */
 		ieee80211_chandef_eht_oper(&bwi->info, true, true,
-					   &new_vht_chandef);
-	} else if (wide_bw_chansw_ie) {
-		u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
-		struct ieee80211_vht_operation vht_oper = {
-			.chan_width =
-				wide_bw_chansw_ie->new_channel_width,
-			.center_freq_seg0_idx =
-				wide_bw_chansw_ie->new_center_freq_seg0,
-			.center_freq_seg1_idx = new_seg1,
-			/* .basic_mcs_set doesn't matter */
-		};
-		struct ieee80211_ht_operation ht_oper = {
-			.operation_mode =
-				cpu_to_le16(new_seg1 <<
-					    IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
-		};
-
-		/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
-		 * to the previously parsed chandef
-		 */
-		new_vht_chandef = csa_ie->chandef;
+					   &new_chandef);
+	} else if (new_band == NL80211_BAND_6GHZ) {
+		size = sizeof(struct ieee80211_he_operation) +
+		       sizeof(struct ieee80211_he_6ghz_oper);
+		he_oper = kzalloc(size, GFP_KERNEL);
+		if (!he_oper)
+			return -ENOMEM;
+
+		size = sizeof(struct ieee80211_eht_operation) +
+		       sizeof(struct ieee80211_eht_operation_info);
+		eht_oper = kzalloc(size, GFP_KERNEL);
+		if (!eht_oper) {
+			kfree(he_oper);
+			return -ENOMEM;
+		}
+
+		if (new_op_class && new_op_class != 135 && new_op_class != 137) {
+			/* There is no way to tell the ccfs1 for op_class 135
+			 * (80P80 MHz) and 137 (320 MHz).
+			 */
+			op_class_to_6ghz_he_eht_oper(new_op_class, new_chan,
+						     he_oper, eht_oper);
+		} else if (wide_bw_chansw_ie) {
+			wbcs_ie_to_6ghz_he_eht_oper(wide_bw_chansw_ie,
+						    new_chan_no, he_oper,
+						    eht_oper);
+		}
+
+		new_chandef = csa_ie->chandef;
 
 		/* ignore if parsing fails */
-		if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
-						vht_cap_info,
-						&vht_oper, &ht_oper,
-						&new_vht_chandef))
-			new_vht_chandef.chan = NULL;
+		if (!ieee80211_chandef_he_6ghz_oper(sdata, he_oper, eht_oper,
+						    &new_chandef))
+			new_chandef.chan = NULL;
+
+		kfree(he_oper);
+		kfree(eht_oper);
+	} else {
+		sband = sdata->local->hw.wiphy->bands[new_band];
+		memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
+		ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
+
+		if (!sta_ht_cap.ht_supported ||
+		    !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
+			goto out;
+
+		ht_oper = kzalloc(sizeof(*ht_oper), GFP_KERNEL);
+		if (!ht_oper)
+			return -ENOMEM;
+
+		vht_oper = kzalloc(sizeof(*vht_oper), GFP_KERNEL);
+		if (!vht_oper) {
+			kfree(ht_oper);
+			return -ENOMEM;
+		}
+
+		if (new_op_class && new_op_class != 130) {
+			/* There is no way to tell the ccfs1 for op_class 130
+			 * (80P80 MHz).
+			 */
+			op_class_to_ht_vht_oper(new_op_class, new_chan, ht_oper,
+						vht_oper);
+		} else if (wide_bw_chansw_ie && new_band == NL80211_BAND_5GHZ &&
+			   sband->vht_cap.vht_supported) {
+			/* It is assumed that there is no WBCS IE in the beacon
+			 * from a 2 GHz BSS during a channel switch.
+			 */
+			wbcs_ie_to_ht_vht_oper(new_chan, wide_bw_chansw_ie,
+					       ht_oper, vht_oper);
+		} else {
+			kfree(ht_oper);
+			kfree(vht_oper);
+			goto out;
+		}
+
+		new_chandef = csa_ie->chandef;
+
+		ieee80211_chandef_ht_oper(ht_oper, &new_chandef);
+
+		/* ignore if parsing fails */
+		if (sband->vht_cap.vht_supported &&
+		    !ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
+						vht_oper, ht_oper, &new_chandef))
+			new_chandef.chan = NULL;
+
+		kfree(ht_oper);
+		kfree(vht_oper);
+	}
+
+	if (new_chandef.chan) {
+		if (conn_flags & IEEE80211_CONN_DISABLE_320MHZ &&
+		    new_chandef.width == NL80211_CHAN_WIDTH_320)
+			ieee80211_chandef_downgrade(&new_chandef);
 
 		if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ &&
-		    new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
-			ieee80211_chandef_downgrade(&new_vht_chandef);
+		    new_chandef.width == NL80211_CHAN_WIDTH_80P80)
+			ieee80211_chandef_downgrade(&new_chandef);
+
 		if (conn_flags & IEEE80211_CONN_DISABLE_160MHZ &&
-		    new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
-			ieee80211_chandef_downgrade(&new_vht_chandef);
-	}
+		    new_chandef.width == NL80211_CHAN_WIDTH_160)
+			ieee80211_chandef_downgrade(&new_chandef);
 
-	/* if VHT data is there validate & use it */
-	if (new_vht_chandef.chan) {
-		if (!cfg80211_chandef_compatible(&new_vht_chandef,
+		if (!cfg80211_chandef_compatible(&new_chandef,
 						 &csa_ie->chandef)) {
 			sdata_info(sdata,
 				   "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
 				   bssid);
 			return -EINVAL;
 		}
-		csa_ie->chandef = new_vht_chandef;
+
+		csa_ie->chandef = new_chandef;
 	}
 
+out:
 	if (elems->max_channel_switch_time)
 		csa_ie->max_switch_time =
 			(elems->max_channel_switch_time[0] << 0) |