[PATCH v2] ath10k: support for multicast rate control

[PATCH v2] ath10k: support for multicast rate control

[Pradeep Kumar Chitrapu]

Issues wmi command to firmwre when multicast rate change is received
with the new BSS_CHANGED_MCAST_RATE flag.
Also fixes the incorrect fixed_rate setting for CCK rates which got
introduced with addition of ath10k_rates_rev2 enum.

Tested on QCA9984 with firmware ver 10.4-3.6-00104

Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
---
v2:
 - fixed the CCK rates setting for mcast_rate and fixed_rate paths.
 - set broadcast rate along with multicast rate setting.

 drivers/net/wireless/ath/ath10k/mac.c | 54 ++++++++++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 3d7119a..70a0563 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -101,6 +101,8 @@
 #define ath10k_g_rates_rev2 (ath10k_rates_rev2 + 0)
 #define ath10k_g_rates_rev2_size (ARRAY_SIZE(ath10k_rates_rev2))
 
+#define ath10k_wmi_legacy_rates ath10k_rates
+
 static bool ath10k_mac_bitrate_is_cck(int bitrate)
 {
 	switch (bitrate) {
@@ -5426,8 +5428,12 @@ static void ath10k_bss_info_changed(struct ieee80211_hw *hw,
 {
 	struct ath10k *ar = hw->priv;
 	struct ath10k_vif *arvif = (void *)vif->drv_priv;
-	int ret = 0;
+	struct cfg80211_chan_def def;
 	u32 vdev_param, pdev_param, slottime, preamble;
+	u16 bitrate, hw_value;
+	u8 rate;
+	int rateidx, ret = 0;
+	enum nl80211_band band;
 
 	mutex_lock(&ar->conf_mutex);
 
@@ -5595,6 +5601,44 @@ static void ath10k_bss_info_changed(struct ieee80211_hw *hw,
 				    arvif->vdev_id, ret);
 	}
 
+	if (changed & BSS_CHANGED_MCAST_RATE &&
+	    !WARN_ON(ath10k_mac_vif_chan(arvif->vif, &def))) {
+		band = def.chan->band;
+		rateidx = vif->bss_conf.mcast_rate[band] - 1;
+
+		if (ar->phy_capability & WHAL_WLAN_11A_CAPABILITY)
+			rateidx += ATH10K_MAC_FIRST_OFDM_RATE_IDX;
+
+		bitrate = ath10k_wmi_legacy_rates[rateidx].bitrate;
+		hw_value = ath10k_wmi_legacy_rates[rateidx].hw_value;
+		if (ath10k_mac_bitrate_is_cck(bitrate))
+			preamble = WMI_RATE_PREAMBLE_CCK;
+		else
+			preamble = WMI_RATE_PREAMBLE_OFDM;
+
+		rate = ATH10K_HW_RATECODE(hw_value, 0, preamble);
+
+		ath10k_dbg(ar, ATH10K_DBG_MAC,
+			   "mac vdev %d mcast_rate %x\n",
+			   arvif->vdev_id, rate);
+
+		vdev_param = ar->wmi.vdev_param->mcast_data_rate;
+		ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id,
+						vdev_param, rate);
+		if (ret)
+			ath10k_warn(ar,
+				    "failed to set mcast rate on vdev %i: %d\n",
+				    arvif->vdev_id,  ret);
+
+		vdev_param = ar->wmi.vdev_param->bcast_data_rate;
+		ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id,
+						vdev_param, rate);
+		if (ret)
+			ath10k_warn(ar,
+				    "failed to set bcast rate on vdev %i: %d\n",
+				    arvif->vdev_id,  ret);
+	}
+
 	mutex_unlock(&ar->conf_mutex);
 }
 
@@ -6895,7 +6939,6 @@ ath10k_mac_bitrate_mask_get_single_rate(
 					const struct cfg80211_bitrate_mask *mask,
 					u8 *rate, u8 *nss)
 {
-	struct ieee80211_supported_band *sband = &ar->mac.sbands[band];
 	int rate_idx;
 	int i;
 	u16 bitrate;
@@ -6905,8 +6948,11 @@ ath10k_mac_bitrate_mask_get_single_rate(
 	if (hweight32(mask->control[band].legacy) == 1) {
 		rate_idx = ffs(mask->control[band].legacy) - 1;
 
-		hw_rate = sband->bitrates[rate_idx].hw_value;
-		bitrate = sband->bitrates[rate_idx].bitrate;
+		if (ar->phy_capability & WHAL_WLAN_11A_CAPABILITY)
+			rate_idx += ATH10K_MAC_FIRST_OFDM_RATE_IDX;
+
+		hw_rate = ath10k_wmi_legacy_rates[rate_idx].hw_value;
+		bitrate = ath10k_wmi_legacy_rates[rate_idx].bitrate;
 
 		if (ath10k_mac_bitrate_is_cck(bitrate))
 			preamble = WMI_RATE_PREAMBLE_CCK;
-- 
1.9.1

Re: [PATCH v2] ath10k: support for multicast rate control

[Sven Eckelmann]

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On Montag, 7. Mai 2018 18:34:51 CEST Pradeep Kumar Chitrapu wrote:
> Issues wmi command to firmwre when multicast rate change is received
> with the new BSS_CHANGED_MCAST_RATE flag.
> Also fixes the incorrect fixed_rate setting for CCK rates which got
> introduced with addition of ath10k_rates_rev2 enum.
> 
> Tested on QCA9984 with firmware ver 10.4-3.6-00104
> 
> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
> ---
> v2:
>  - fixed the CCK rates setting for mcast_rate and fixed_rate paths.
>  - set broadcast rate along with multicast rate setting.

These things are only modified in ath10k_bss_info_changed and not saved/
restored. What happens when the HW needs to be reset (there are are couple of 
firmware crashes which can be seen in the wild and are handled by ath10k)? I 
would guess that not all of them automatically cause an .bss_info_changed.

Kind regards,
	Sven

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Re: [PATCH v2] ath10k: support for multicast rate control

[Sebastian Gottschall]

Am 09.05.2018 um 08:15 schrieb Sven Eckelmann:
> On Montag, 7. Mai 2018 18:34:51 CEST Pradeep Kumar Chitrapu wrote:
>> Issues wmi command to firmwre when multicast rate change is received
>> with the new BSS_CHANGED_MCAST_RATE flag.
>> Also fixes the incorrect fixed_rate setting for CCK rates which got
>> introduced with addition of ath10k_rates_rev2 enum.
>>
>> Tested on QCA9984 with firmware ver 10.4-3.6-00104
>>
>> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
>> ---
>> v2:
>>   - fixed the CCK rates setting for mcast_rate and fixed_rate paths.
>>   - set broadcast rate along with multicast rate setting.
> These things are only modified in ath10k_bss_info_changed and not saved/
> restored. What happens when the HW needs to be reset (there are are couple of
> firmware crashes which can be seen in the wild and are handled by ath10k)? I
> would guess that not all of them automatically cause an .bss_info_changed.
>
i have never seen a card properly recovering after a firmware crash, all 
firmware crashes i have seen
are caused by bugs in firmware handling or the firmware itself. so if it 
recovers it crashes immediatly again
ending in a endless crashloop since the cause for the crash hasnt been 
fixed. they are often triggered by extern clients for instance which 
still remain in the field.
i think firmware crashes should not be hidden by recovering. this would 
also force users to report problems more frequently, than they do
since they dont even take notice of such problems

Sebastian

> 	

Re: [PATCH v2] ath10k: support for multicast rate control

[Ben Greear]

On 05/08/2018 11:57 PM, Sebastian Gottschall wrote:
>
>
> Am 09.05.2018 um 08:15 schrieb Sven Eckelmann:
>> On Montag, 7. Mai 2018 18:34:51 CEST Pradeep Kumar Chitrapu wrote:
>>> Issues wmi command to firmwre when multicast rate change is received
>>> with the new BSS_CHANGED_MCAST_RATE flag.
>>> Also fixes the incorrect fixed_rate setting for CCK rates which got
>>> introduced with addition of ath10k_rates_rev2 enum.
>>>
>>> Tested on QCA9984 with firmware ver 10.4-3.6-00104
>>> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
>>> ---
>>> v2:
>>>   - fixed the CCK rates setting for mcast_rate and fixed_rate paths.
>>>   - set broadcast rate along with multicast rate setting.
>> These things are only modified in ath10k_bss_info_changed and not saved/
>> restored. What happens when the HW needs to be reset (there are are couple of
>> firmware crashes which can be seen in the wild and are handled by ath10k)? I
>> would guess that not all of them automatically cause an .bss_info_changed.

Yes, that sounds like a good idea to me.

> i have never seen a card properly recovering after a firmware crash, all firmware crashes i have seen
> are caused by bugs in firmware handling or the firmware itself. so if it recovers it crashes immediatly again
> ending in a endless crashloop since the cause for the crash hasnt been fixed. they are often triggered by extern clients for instance which still remain in the field.
> i think firmware crashes should not be hidden by recovering. this would also force users to report problems more frequently, than they do
> since they dont even take notice of such problems

We see recovery work often.  If you see repeatable crashes, post them
to the list.

Do you know of any particular external clients that cause these crashes?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

Re: [PATCH v2] ath10k: support for multicast rate control

[pradeepc]

On 2018-05-09 07:31, Ben Greear wrote:
> On 05/08/2018 11:57 PM, Sebastian Gottschall wrote:
>> 
>> 
>> Am 09.05.2018 um 08:15 schrieb Sven Eckelmann:
>>> On Montag, 7. Mai 2018 18:34:51 CEST Pradeep Kumar Chitrapu wrote:
>>>> Issues wmi command to firmwre when multicast rate change is received
>>>> with the new BSS_CHANGED_MCAST_RATE flag.
>>>> Also fixes the incorrect fixed_rate setting for CCK rates which got
>>>> introduced with addition of ath10k_rates_rev2 enum.
>>>> 
>>>> Tested on QCA9984 with firmware ver 10.4-3.6-00104
>>>> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
>>>> ---
>>>> v2:
>>>>   - fixed the CCK rates setting for mcast_rate and fixed_rate paths.
>>>>   - set broadcast rate along with multicast rate setting.
>>> These things are only modified in ath10k_bss_info_changed and not 
>>> saved/
>>> restored. What happens when the HW needs to be reset (there are are 
>>> couple of
>>> firmware crashes which can be seen in the wild and are handled by 
>>> ath10k)? I
>>> would guess that not all of them automatically cause an 
>>> .bss_info_changed.
> 
> Yes, that sounds like a good idea to me.
> 
Hi Sven, Thanks for the review.
In case of HW reset, I see ieee80211_reconfig triggers bss_info changed 
and
BSS_CHANGED_MCAST_RATE is already being set in this function.
(https://patchwork.kernel.org/patch/10302175/). isn't this sufficient 
for the
re-configuring the mcast rate? Please let me know if I am missing 
something.

Thanks
Pradeep

>> i have never seen a card properly recovering after a firmware crash, 
>> all firmware crashes i have seen
>> are caused by bugs in firmware handling or the firmware itself. so if 
>> it recovers it crashes immediatly again
>> ending in a endless crashloop since the cause for the crash hasnt been 
>> fixed. they are often triggered by extern clients for instance which 
>> still remain in the field.
>> i think firmware crashes should not be hidden by recovering. this 
>> would also force users to report problems more frequently, than they 
>> do
>> since they dont even take notice of such problems
> 
> We see recovery work often.  If you see repeatable crashes, post them
> to the list.
> 
> Do you know of any particular external clients that cause these 
> crashes?
> 
> Thanks,
> Ben

Re: [v2] ath10k: support for multicast rate control

[Kalle Valo]

Pradeep Kumar Chitrapu <pradeepc@codeaurora.org> wrote:

> Issues wmi command to firmwre when multicast rate change is received
> with the new BSS_CHANGED_MCAST_RATE flag.
> Also fixes the incorrect fixed_rate setting for CCK rates which got
> introduced with addition of ath10k_rates_rev2 enum.
> 
> Tested on QCA9984 with firmware ver 10.4-3.6-00104
> 
> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

ath10k-check found some whitespace issues:

drivers/net/wireless/ath/ath10k/mac.c:6110: Alignment should match open parenthesis
drivers/net/wireless/ath/ath10k/mac.c:6113: Alignment should match open parenthesis
drivers/net/wireless/ath/ath10k/mac.c:6116: Alignment should match open parenthesis

I fixed those in the pending branch.

-- 
https://patchwork.kernel.org/patch/10385043/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH v2] ath10k: support for multicast rate control

[Kalle Valo]

Pradeep Kumar Chitrapu <pradeepc@codeaurora.org> wrote:

> Issues a wmi command to firmware when multicast rate change is received with the
> new BSS_CHANGED_MCAST_RATE flag.  Also fixes the incorrect fixed_rate setting
> for CCK rates which got introduced with addition of ath10k_rates_rev2 enum.
> 
> Tested on QCA9984 with firmware ver 10.4-3.6-00104
> 
> Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

cd93b83ad927 ath10k: support for multicast rate control

-- 
https://patchwork.kernel.org/patch/10385043/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches