2013-04-08 07:19:47

by Johannes Berg

Subject: [PATCH] mac80211: always advertise STBC/MCSes even if no AP support

From: Johannes Berg <[email protected]>

Advertise STBC capabilities and MCS rates even if the AP
doesn't support them. This has always been the right thing
to do, but used to be problematic with some APs. Now WFA
testing requires this so re-enable it, problematic APs
would then presumably not pass the test and be fixed.

Signed-off-by: Johannes Berg <[email protected]>
---
net/mac80211/mlme.c | 31 -------------------------------
1 file changed, 31 deletions(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 304d6cf..15876f3 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -632,37 +632,6 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;

- if (!(ap_vht_cap->vht_cap_info &
- cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC)))
- cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 |
- IEEE80211_VHT_CAP_RXSTBC_3 |
- IEEE80211_VHT_CAP_RXSTBC_4);
-
- for (i = 0; i < 8; i++) {
- int shift = i * 2;
- u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift;
- u16 ap_mcs, our_mcs;
-
- ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) &
- mask) >> shift;
- our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) &
- mask) >> shift;
-
- if (our_mcs == IEEE80211_VHT_MCS_NOT_SUPPORTED)
- continue;
-
- switch (ap_mcs) {
- default:
- if (our_mcs <= ap_mcs)
- break;
- /* fall through */
- case IEEE80211_VHT_MCS_NOT_SUPPORTED:
- vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask);
- vht_cap.vht_mcs.rx_mcs_map |=
- cpu_to_le16(ap_mcs << shift);
- }
- }
-
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
--
1.8.0

2013-04-10 12:41:21

by Johannes Berg

Subject: Re: [PATCH] mac80211: always advertise STBC/MCSes even if no AP support

On Mon, 2013-04-08 at 09:19 +0200, Johannes Berg wrote:
> From: Johannes Berg <[email protected]>
>
> Advertise STBC capabilities and MCS rates even if the AP
> doesn't support them. This has always been the right thing
> to do, but used to be problematic with some APs. Now WFA
> testing requires this so re-enable it, problematic APs
> would then presumably not pass the test and be fixed.

Applied.

johannes