wifi: ath12k: allow peer_id 0 in dp peer lookup

For some chipsets, firmware can report HTT_T2H_MSG_TYPE_PEER_MAP2 with
peer_id 0 as a valid value for mapping ath12k_dp_link_peer to
ath12k_dp_peer.

ath12k_dp_peer_find_by_peerid() currently treats peer_id 0 as invalid.
When firmware assigns peer_id 0, peer lookup fails. As a result,
DHCP OFFER packets are dropped in __ieee80211_rx_handle_packet()
because pubsta is NULL.

ath12k_dp_rx_deliver_msdu() <- rx_info->peer_id 0
  ath12k_dp_peer_find_by_peerid -> peer NULL
  ieee80211_rx_napi <- pubsta NULL
    ieee80211_rx_list
      __ieee80211_rx_handle_packet <- pubsta NULL, skb undelivered

The following error in the TX completion path is caused by the same issue:

ath12k_wifi7_pci 0000:04:00.0: dp_tx: failed to find the peer with peer_id 0

The error message is triggered by:
ath12k_wifi7_dp_tx_complete_msdu
  ath12k_dp_link_peer_find_by_peerid <- ts->peer_id 0
    ath12k_dp_peer_find_by_peerid -> peer NULL

ath12k_dp_tx_htt_tx_complete_buf
  ath12k_dp_link_peer_find_by_peerid <- peer_id 0
    ath12k_dp_peer_find_by_peerid -> peer NULL

Fix this by allowing peer_id 0 in ath12k_dp_peer_find_by_peerid() and
rejecting only values >= ATH12K_DP_PEER_ID_INVALID.

Also update peer_id 0 handling in monitor path:
Always call ath12k_dp_link_peer_find_by_peerid() in
ath12k_dp_rx_h_find_link_peer() to fetch the peer, including when
peer_id is 0.
Always store peer_id in ppdu_info->peer_id in
ath12k_wifi7_dp_mon_rx_parse_status_tlv(), including peer_id 0.

Tested-on: QCC2072 hw1.0 PCI WLAN.COL.1.0.c2-00074-QCACOLSWPL_V1_TO_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1

Signed-off-by: Hangtian Zhu <hangtian.zhu@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Link: https://patch.msgid.link/20260512025732.1297849-1-hangtian.zhu@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions