Fix cfg80211_chandef_usable():
consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
Based on:
"Table 9-272 — Setting of the Supported Channel Width Set subfield and Extended NSS BW
Support subfield at a STA transmitting the VHT Capabilities Information field"
From "Draft P802.11REVmd_D3.0.pdf"
Signed-off-by: Aviad Brikman <[email protected]>
Signed-off-by: Shay Bar <[email protected]>
---
net/wireless/chan.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 90f0f82cd9ca..a51d11d3be33 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -912,6 +912,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
struct ieee80211_sta_vht_cap *vht_cap;
struct ieee80211_edmg *edmg_cap;
u32 width, control_freq, cap;
+ bool support_80_80 = false;
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return false;
@@ -979,9 +980,16 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
return false;
break;
case NL80211_CHAN_WIDTH_80P80:
- cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
+ cap = vht_cap->cap;
+ support_80_80 =
+ ((cap &
+ IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
+ (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
+ cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
+ ((cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
+ IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT > 1));
if (chandef->chan->band != NL80211_BAND_6GHZ &&
- cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
+ !support_80_80)
return false;
/* fall through */
case NL80211_CHAN_WIDTH_80:
@@ -1001,7 +1009,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
return false;
cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
- cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
+ cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
+ !(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
return false;
break;
default:
--
2.17.1
________________________________
The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any retransmission, dissemination, copying or other use of, or taking of any action in reliance upon this information is prohibited. If you received this in error, please contact the sender and delete the material from any computer. Nothing contained herein shall be deemed as a representation, warranty or a commitment by Celeno. No warranties are expressed or implied, including, but not limited to, any implied warranties of non-infringement, merchantability and fitness for a particular purpose.
________________________________
On 2020-08-26 22:31, Shay Bar wrote:
> Fix cfg80211_chandef_usable():
> consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
>
When station with below 2 bit and connect to a 160MHZ 11ac mode AP, it
will try to use 160Mhz width after this patch,
but it does not support 160M in fact according spec of IEEE 802.11
.... .... .... .... .... .... .... 00.. = Supported Channel Width Set:
Neither 160MHz nor 80+80 supported (0x0)
01.. .... .... .... .... .... .... .... = Extended NSS BW Support: 0x1
refer to spec of IEEE 802.11.
Table 9-250—Setting of the Supported Channel Width Set subfield and
Extended NSS BW Support subfield at a STA transmitting the VHT
Capabilities Information field
value of the 160Mhz is 1/2 in the table for upper configure.
NOTE 2—1/2× or 3/4× Max VHT NSS support might end up being 0, indicating
no support.
> Based on:
> "Table 9-272 — Setting of the Supported Channel Width Set subfield and
> Extended NSS BW
> Support subfield at a STA transmitting the VHT Capabilities Information
> field"
> From "Draft P802.11REVmd_D3.0.pdf"
>
> Signed-off-by: Aviad Brikman <[email protected]>
> Signed-off-by: Shay Bar <[email protected]>
> ---
> net/wireless/chan.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/net/wireless/chan.c b/net/wireless/chan.c
> index 90f0f82cd9ca..a51d11d3be33 100644
> --- a/net/wireless/chan.c
> +++ b/net/wireless/chan.c
> @@ -912,6 +912,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> struct ieee80211_sta_vht_cap *vht_cap;
> struct ieee80211_edmg *edmg_cap;
> u32 width, control_freq, cap;
> + bool support_80_80 = false;
>
> if (WARN_ON(!cfg80211_chandef_valid(chandef)))
> return false;
> @@ -979,9 +980,16 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> return false;
> break;
> case NL80211_CHAN_WIDTH_80P80:
> - cap = vht_cap->cap &
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
> + cap = vht_cap->cap;
> + support_80_80 =
> + ((cap &
> +
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
> + (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ
> &&
> + cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
> + ((cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
> + IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT
> > 1));
> if (chandef->chan->band != NL80211_BAND_6GHZ &&
> - cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> + !support_80_80)
> return false;
> /* fall through */
> case NL80211_CHAN_WIDTH_80:
> @@ -1001,7 +1009,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> return false;
> cap = vht_cap->cap &
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
> if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
> - cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> + cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
> + !(vht_cap->cap &
> IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
> return false;
> break;
> default:
> --
> 2.17.1
>
> ________________________________
> The information transmitted is intended only for the person or entity
> to which it is addressed and may contain confidential and/or
> privileged material. Any retransmission, dissemination, copying or
> other use of, or taking of any action in reliance upon this
> information is prohibited. If you received this in error, please
> contact the sender and delete the material from any computer. Nothing
> contained herein shall be deemed as a representation, warranty or a
> commitment by Celeno. No warranties are expressed or implied,
> including, but not limited to, any implied warranties of
> non-infringement, merchantability and fitness for a particular
> purpose.
> ________________________________
On 30/12/2020 12:57, Wen Gong wrote:
>
> On 2020-08-26 22:31, Shay Bar wrote:
>> Fix cfg80211_chandef_usable():
>> consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
>>
> When station with below 2 bit and connect to a 160MHZ 11ac mode AP, it
> will try to use 160Mhz width after this patch,
> but it does not support 160M in fact according spec of IEEE 802.11
> .... .... .... .... .... .... .... 00.. = Supported Channel Width Set:
> Neither 160MHz nor 80+80 supported (0x0)
> 01.. .... .... .... .... .... .... .... = Extended NSS BW Support: 0x1
>
> refer to spec of IEEE 802.11.
> Table 9-250—Setting of the Supported Channel Width Set subfield and
> Extended NSS BW Support subfield at a STA transmitting the VHT
> Capabilities Information field
> value of the 160Mhz is 1/2 in the table for upper configure.
> NOTE 2—1/2× or 3/4× Max VHT NSS support might end up being 0, indicating
> no support.
>
You mean for AP's with 1 SS for example ?
On 2020-08-26 22:31, Shay Bar wrote:
> Fix cfg80211_chandef_usable():
> consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
>
> Based on:
> "Table 9-272 — Setting of the Supported Channel Width Set subfield and
> Extended NSS BW
> Support subfield at a STA transmitting the VHT Capabilities Information
> field"
> From "Draft P802.11REVmd_D3.0.pdf"
>
> Signed-off-by: Aviad Brikman <[email protected]>
> Signed-off-by: Shay Bar <[email protected]>
> ---
> net/wireless/chan.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/net/wireless/chan.c b/net/wireless/chan.c
> index 90f0f82cd9ca..a51d11d3be33 100644
> --- a/net/wireless/chan.c
> +++ b/net/wireless/chan.c
> @@ -912,6 +912,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> struct ieee80211_sta_vht_cap *vht_cap;
> struct ieee80211_edmg *edmg_cap;
> u32 width, control_freq, cap;
> + bool support_80_80 = false;
>
> if (WARN_ON(!cfg80211_chandef_valid(chandef)))
> return false;
> @@ -979,9 +980,16 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> return false;
> break;
> case NL80211_CHAN_WIDTH_80P80:
> - cap = vht_cap->cap &
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
> + cap = vht_cap->cap;
> + support_80_80 =
> + ((cap &
> +
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
> + (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ
> &&
> + cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
> + ((cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
> + IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT
> > 1));
> if (chandef->chan->band != NL80211_BAND_6GHZ &&
> - cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> + !support_80_80)
> return false;
> /* fall through */
> case NL80211_CHAN_WIDTH_80:
> @@ -1001,7 +1009,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
> return false;
> cap = vht_cap->cap &
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
> if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
> - cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> + cap !=
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
> + !(vht_cap->cap &
> IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
> return false;
in Table 9-251—Supported VHT-MCS and NSS Set subfields, it has Subfield
VHT Extended
NSS BW Capable, its Definition is:
Indicates whether the STA is capable of
interpreting the Extended NSS BW
Support subfield of the VHT Capabilities
Information field
so it should check the Subfield VHT Extended NSS BW Capable in
vht_cap->vht_mcs firstly, if
it is 0, then not allowed to check IEEE80211_VHT_CAP_EXT_NSS_BW_MASK of
vht_cap->cap.
please correct me if wrong.
> break;
> default:
> --
> 2.17.1
>
> ________________________________
> The information transmitted is intended only for the person or entity
> to which it is addressed and may contain confidential and/or
> privileged material. Any retransmission, dissemination, copying or
> other use of, or taking of any action in reliance upon this
> information is prohibited. If you received this in error, please
> contact the sender and delete the material from any computer. Nothing
> contained herein shall be deemed as a representation, warranty or a
> commitment by Celeno. No warranties are expressed or implied,
> including, but not limited to, any implied warranties of
> non-infringement, merchantability and fitness for a particular
> purpose.
> ________________________________