On Tue, Dec 06, 2016 at 06:02:52PM +0100, Jean-Pierre Tosoni wrote:
> This follows on the previous discussion
> "Client station sends probes on DFS channels"
>
> Problem:
> The combination of QCA988X firmware v10.2.4.70-2 + ath10k +
> wpa_supplicant do not comply with the norm ETSI/EN 301-893
> section 4.7; because they can send probes for 600s when no
> AP is around.
>
> Analysis:
> The problem seems to lie in the firmware, which regards the presence
> of *any* beacon as a proof that the channel is radar-clean for 600s.
I don't think this is really firmware, but cfg80211 regulatory code and
how it interacts with ath10k..
> - there is no obvious fix working in ath10k.
> - the issue does not show up with other mac80211 devices like ath9k.
> - wpa_supplicant considers this is a kernel issue [2]
There seems to be a difference between ath9k (mac80211-based Probe
Request frame sending) and ath10k (firmware) in this area for active
scanning. mac80211 uses IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR
while ath10k uses IEEE80211_CHAN_NO_IR. I'd assume this difference
results in ath10k using cfg80211 beacon hints (etc.) to update the NO_IR
flag and that might be behind the difference you see.
Could you check whether the following change gets you the behavior you
want to see here? I have not had a chance to test this yet, but based on
code review, it looks like something that brings the same behavior to
ath10k that ath9k has for this through mac80211.
diff --git a/drivers/net/wireless/ath/ath10k/mac.c
b/drivers/net/wireless/ath/ath10k/mac.c
index aa545a1..758dbbd 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2973,7 +2973,8 @@ static int ath10k_update_channel_list(struct ath10k *ar)
ch->chan_radar =
!!(channel->flags & IEEE80211_CHAN_RADAR);
- passive = channel->flags & IEEE80211_CHAN_NO_IR;
+ passive = channel->flags & (IEEE80211_CHAN_NO_IR |
+ IEEE80211_CHAN_RADAR);
ch->passive = passive;
ch->freq = channel->center_freq;
--
Jouni Malinen PGP id EFC895FA
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