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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Venkateswara Naralasetty <vnaralas@codeaurora.org>,
        Markus Theil <markus.theil@tu-ilmenau.de>,
        John Deere <24601deerej@gmail.com>,
        Sven Eckelmann <sven@narfation.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 103/408] ath10k: provide survey info as accumulated data
Date:   Tue, 27 Oct 2020 14:50:41 +0100
Message-Id: <20201027135459.879588055@linuxfoundation.org>
In-Reply-To: <20201027135455.027547757@linuxfoundation.org>
References: <20201027135455.027547757@linuxfoundation.org>
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From: Venkateswara Naralasetty <vnaralas@codeaurora.org>

[ Upstream commit 720e5c03e5cb26d33d97f55192b791bb48478aa5 ]

It is expected that the returned counters by .get_survey are monotonic
increasing. But the data from ath10k gets reset to zero regularly. Channel
active/busy time are then showing incorrect values (less than previous or
sometimes zero) for the currently active channel during successive survey
dump commands.

example:

  $ iw dev wlan0 survey dump
  Survey data from wlan0
  	frequency:                      5180 MHz [in use]
  	channel active time:            54995 ms
  	channel busy time:              432 ms
  	channel receive time:           0 ms
  	channel transmit time:          59 ms
  ...

  $ iw dev wlan0 survey dump
  Survey data from wlan0
  	frequency:                      5180 MHz [in use]
  	channel active time:            32592 ms
  	channel busy time:              254 ms
  	channel receive time:           0 ms
  	channel transmit time:          0 ms
  ...

The correct way to handle this is to use the non-clearing
WMI_BSS_SURVEY_REQ_TYPE_READ wmi_bss_survey_req_type. The firmware will
then accumulate the survey data and handle wrap arounds.

Tested-on: QCA9984 hw1.0 10.4-3.5.3-00057
Tested-on: QCA988X hw2.0 10.2.4-1.0-00047
Tested-on: QCA9888 hw2.0 10.4-3.9.0.2-00024
Tested-on: QCA4019 hw1.0 10.4-3.6-00140

Fixes: fa7937e3d5c2 ("ath10k: update bss channel survey information")
Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Tested-by: Markus Theil <markus.theil@tu-ilmenau.de>
Tested-by: John Deere <24601deerej@gmail.com>
[sven@narfation.org: adjust commit message]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1592232686-28712-1-git-send-email-kvalo@codeaurora.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/ath/ath10k/mac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index d373602a80145..915ba2a7f7448 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -7131,7 +7131,7 @@ ath10k_mac_update_bss_chan_survey(struct ath10k *ar,
 				  struct ieee80211_channel *channel)
 {
 	int ret;
-	enum wmi_bss_survey_req_type type = WMI_BSS_SURVEY_REQ_TYPE_READ_CLEAR;
+	enum wmi_bss_survey_req_type type = WMI_BSS_SURVEY_REQ_TYPE_READ;
 
 	lockdep_assert_held(&ar->conf_mutex);
 
-- 
2.25.1