[PATCH] wifi: ath12k: modify remain on channel for single wiphy
Rameshkumar Sundaram
quic_ramess at quicinc.com
Mon Jun 10 23:45:59 PDT 2024
On 6/10/2024 7:26 PM, Kalle Valo wrote:
> Rameshkumar Sundaram <quic_ramess at quicinc.com> writes:
>
>> When multiple radios are advertised as a single wiphy which
>> supports various bands, vdev creation for the vif is deferred
>> until channel is assigned to it.
>> If a remain on channel(RoC) request is received from mac80211,
>> select the corresponding radio(ar) based on channel and create
>> a vdev on that radio to initiate an RoC scan.
>>
>> Note that on RoC completion this vdev is not deleted. If a new
>> RoC/hw scan request is seen on that same vif for a different band the
>> vdev will be deleted and created on the new radio supporting the
>> request.
>>
>> Also if the RoC scan is requested when the vdev is in started state,
>> no switching to new radio is allowed and RoC request can be accepted
>> only on channels within same radio.
>>
>> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
>> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
>>
>> Signed-off-by: Rameshkumar Sundaram <quic_ramess at quicinc.com>
>
> I did some white space changes to the commit message.
>
>> @@ -8416,12 +8416,63 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw,
>> struct ath12k_vif *arvif = ath12k_vif_to_arvif(vif);
>> struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
>> struct ath12k_wmi_scan_req_arg arg;
>> - struct ath12k *ar;
>> + struct ath12k *ar, *prev_ar;
>> u32 scan_time_msec;
>> + bool create = true;
>> int ret;
>>
>> - ar = ath12k_ah_to_ar(ah, 0);
>> + if (ah->num_radio == 1) {
>> + WARN_ON(!arvif->is_created);
>> + ar = ath12k_ah_to_ar(ah, 0);
>> + goto scan;
>> + }
>> +
>> + ar = ath12k_mac_select_scan_device(hw, vif, chan->center_freq);
>> + if (!ar)
>> + return -EINVAL;
>> +
>> + /* If the vif is already assigned to a specific vdev of an ar,
>> + * check whether its already started, vdev which is started
>> + * are not allowed to switch to a new radio.
>> + * If the vdev is not started, but was earlier created on a
>> + * different ar, delete that vdev and create a new one. We don't
>> + * delete at the scan stop as an optimization to avoid redundant
>> + * delete-create vdev's for the same ar, in case the request is
>> + * always on the same band for the vif
>> + */
>> + if (arvif->is_created) {
>> + if (WARN_ON(!arvif->ar))
>> + return -EINVAL;
>> +
>> + if (ar != arvif->ar && arvif->is_started)
>> + return -EINVAL;
>
> I wonder if -EBUSY would be more descriptive here? I changed to that in
> the pending branch.
>
Yeah, landing here would mean that user has already started the
interface on a radio(ar) and now requesting RoC on a channel that
doesn't belong to it.
>> + if (ar != arvif->ar) {
>> + /* backup the previously used ar ptr, since the vdev delete
>> + * would assign the arvif->ar to NULL after the call
>> + */
>> + prev_ar = arvif->ar;
>> + mutex_lock(&prev_ar->conf_mutex);
>> + ret = ath12k_mac_vdev_delete(prev_ar, vif);
>> + mutex_unlock(&prev_ar->conf_mutex);
>> + if (ret)
>> + ath12k_warn(prev_ar->ab,
>> + "unable to delete scan vdev %d\n", ret);
>
> Do we really want to continue if vdev_delete() fails? In the pending
> branch I added 'return ret' here and modified the warning message a bit.
>
>> + } else {
>> + create = false;
>> + }
>> + }
>> +
>> + if (create) {
>> + mutex_lock(&ar->conf_mutex);
>> + ret = ath12k_mac_vdev_create(ar, vif);
>> + mutex_unlock(&ar->conf_mutex);
>> + if (ret) {
>> + ath12k_warn(ar->ab, "unable to create scan vdev %d\n", ret);
>> + return -EINVAL;
>> + }
>
> Also here I modified the warning message a bit.
>
> The pending commit here:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=9b4ec32e921b34bd7a03d39cc0a75cba7e85dc02
>
Changes looks fine for me, thanks a lot for Fixing them.
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