[PATCH ath12k-ng] wifi: ath12k: Skip DP peer creation for scan vdev

[Vasanthakumar Thiagarajan]

On 12/7/2025 12:57 PM, Ripan Deuri wrote:
> Consider a multi-link AP configuration:
> 
>      MLD vif (MAC addr: aa:bb)
>          |-- 2.4 GHz link (BSSID: aa:bb)
>          |-- 5 GHz link   (BSSID: cc:dd)
> 
> For AP vdevs, ath12k creates a DP peer using the arvif's BSSID and stores
> it in dp_hw->dp_peers_list. During scan operations, the driver assigns an
> arvif to the scan vdev and uses the vif's MAC address as its BSSID. In
> the above scenario, the scan vdev MAC address (aa:bb) matches the BSSID
> of the 2.4 GHz AP link, causing a duplicate entry in dp_hw->dp_peers_list
> and leading to scan vdev creation failure.
> 
> Failure in vif bringup sequence:
> 1. Create AP vdev for 2.4 GHz link:
>     - Assign arvif with BSSID = aa:bb and link_id = 0.
>     - Create DP peer with address aa:bb and add to dp_hw->dp_peers_list.
> 
> 2. Create scan vdev for 5 GHz link:
>     - Assign arvif with BSSID = aa:bb (same as vif MAC address) and
>       link_id = 15.
>     - Attempt to create another DP peer with address aa:bb.
>     - Operation fails because aa:bb already exists in dp_hw->dp_peers_list,
>       resulting in duplicate entry conflict.
> 
> 3. Delete scan vdev for 5 GHz link.
> 4. Create AP vdev for 5 GHz link.
> 
> Since DP peer is not needed for scan operations, identify scan vdev using
> arvif->link_id >= IEEE80211_MLD_MAX_NUM_LINKS and skip DP peer creation
> and deletion.
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.5-01651-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Ripan Deuri <quic_rdeuri at quicinc.com>

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan at oss.qualcomm.com>