[PATCH] ath10k: fix ldpc param for fixed rate

[PATCH] ath10k: fix ldpc param for fixed rate

[Rajkumar Manoharan]

ldpc is not configured for fixed rates. This blocks auto rate vs fixed
rate performance comparison. Since firmware is considering ldpc vdev
param for fixed rate selection, it has to be configured to enable ldpc
for fixed rates.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
---
 drivers/net/wireless/ath/ath10k/mac.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 80fe43fa..b347b60 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -5936,7 +5936,7 @@ ath10k_mac_bitrate_mask_get_single_rate(struct ath10k *ar,
 }
 
 static int ath10k_mac_set_fixed_rate_params(struct ath10k_vif *arvif,
-					    u8 rate, u8 nss, u8 sgi)
+					    u8 rate, u8 nss, u8 sgi, u8 ldpc)
 {
 	struct ath10k *ar = arvif->ar;
 	u32 vdev_param;
@@ -5969,6 +5969,13 @@ static int ath10k_mac_set_fixed_rate_params(struct ath10k_vif *arvif,
 		return ret;
 	}
 
+	vdev_param = ar->wmi.vdev_param->ldpc;
+	ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id, vdev_param, ldpc);
+	if (ret) {
+		ath10k_warn(ar, "failed to set ldpc param %d: %d\n", ldpc, ret);
+		return ret;
+	}
+
 	return 0;
 }
 
@@ -6032,6 +6039,7 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
 	u8 rate;
 	u8 nss;
 	u8 sgi;
+	u8 ldpc;
 	int single_nss;
 	int ret;
 
@@ -6041,6 +6049,7 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
 	band = def.chan->band;
 	ht_mcs_mask = mask->control[band].ht_mcs;
 	vht_mcs_mask = mask->control[band].vht_mcs;
+	ldpc = !!(ar->ht_cap_info & WMI_HT_CAP_LDPC);
 
 	sgi = mask->control[band].gi;
 	if (sgi == NL80211_TXRATE_FORCE_LGI)
@@ -6079,7 +6088,7 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
 
 	mutex_lock(&ar->conf_mutex);
 
-	ret = ath10k_mac_set_fixed_rate_params(arvif, rate, nss, sgi);
+	ret = ath10k_mac_set_fixed_rate_params(arvif, rate, nss, sgi, ldpc);
 	if (ret) {
 		ath10k_warn(ar, "failed to set fixed rate params on vdev %i: %d\n",
 			    arvif->vdev_id, ret);
-- 
2.5.2

Re: [PATCH] ath10k: fix ldpc param for fixed rate

[Michal Kazior]

On 16 September 2015 at 09:49, Rajkumar Manoharan
<rmanohar@qti.qualcomm.com> wrote:
> ldpc is not configured for fixed rates. This blocks auto rate vs fixed
> rate performance comparison. Since firmware is considering ldpc vdev
> param for fixed rate selection, it has to be configured to enable ldpc
> for fixed rates.
>
> Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
> ---
[...]
> @@ -6041,6 +6049,7 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
>         band = def.chan->band;
>         ht_mcs_mask = mask->control[band].ht_mcs;
>         vht_mcs_mask = mask->control[band].vht_mcs;
> +       ldpc = !!(ar->ht_cap_info & WMI_HT_CAP_LDPC);

Is still really correct? LDPC must be supported on the Rx side of
destination stations hence I would assume you need to check whether
all stations associated are LDPC capable before enabling it (e.g. via
ieee80211_iterate_stations_atomic).


Michał

Re: [PATCH] ath10k: fix ldpc param for fixed rate

[Rajkumar Manoharan]

On Mon, Sep 21, 2015 at 09:05:54AM +0200, Michal Kazior wrote:
> On 16 September 2015 at 09:49, Rajkumar Manoharan
> <rmanohar@qti.qualcomm.com> wrote:
> > ldpc is not configured for fixed rates. This blocks auto rate vs fixed
> > rate performance comparison. Since firmware is considering ldpc vdev
> > param for fixed rate selection, it has to be configured to enable ldpc
> > for fixed rates.
> >
> > Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
> > ---
> [...]
> > @@ -6041,6 +6049,7 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
> >         band = def.chan->band;
> >         ht_mcs_mask = mask->control[band].ht_mcs;
> >         vht_mcs_mask = mask->control[band].vht_mcs;
> > +       ldpc = !!(ar->ht_cap_info & WMI_HT_CAP_LDPC);
> 
> Is still really correct? LDPC must be supported on the Rx side of
> destination stations hence I would assume you need to check whether
> all stations associated are LDPC capable before enabling it (e.g. via
> ieee80211_iterate_stations_atomic).
>
I already check with firmware on this regard. Below is the clarification
got from fw team. So no need to go through sta_iter.

"3) how does fixed rate work for non-LDPC clients (ex. legacy clients),
if LDPC support is enabled for the given vdev?
The rates are selected by ANDng the vdev_rates and client rates. If client does not
support LDPC and LDPC is enabled in vdev then, LDPC will not be used."

-Rajkumar

Re: [PATCH] ath10k: fix ldpc param for fixed rate

[Kalle Valo]

Rajkumar Manoharan <rmanohar@qti.qualcomm.com> writes:

> ldpc is not configured for fixed rates. This blocks auto rate vs fixed
> rate performance comparison. Since firmware is considering ldpc vdev
> param for fixed rate selection, it has to be configured to enable ldpc
> for fixed rates.
>
> Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>

Thanks, applied.

-- 
Kalle Valo