From: Sarika Sharma quic_sarishar@quicinc.com

[ Upstream commit 4541b0c8c3c1b85564971d497224e57cf8076a02 ]

Currently, RX is_mcbc bit is set for packets sent from client as destination address (DA) is multicast/broadcast address, but packets are actually unicast as receiver address (RA) is not multicast address. Hence, packets are not handled properly due to this is_mcbc bit.

Therefore, reset the is_mcbc bit if interface type is AP.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1

Signed-off-by: Sarika Sharma quic_sarishar@quicinc.com Reviewed-by: Vasanthakumar Thiagarajan vasanthakumar.thiagarajan@oss.qualcomm.com Link: https://patch.msgid.link/20250411061523.859387-3-quic_sarishar@quicinc.com Signed-off-by: Jeff Johnson jeff.johnson@oss.qualcomm.com [ Adjust context ] Signed-off-by: Oliver Sedlbauer os@dev.tdt.de --- Context: The issue was introduced in 6.12.y by the backport of commit f66971c608c4 ("wifi: ath12k: using msdu end descriptor to check for rx multicast packets"), which was part of a patchset: https://lore.kernel.org/all/20250411061523.859387-1-quic_sarishar@quicinc.co...

That commit, without this follow-up patch, causes mac80211 to drop encrypted ARP request frames. As a result, ARP resolution fails, and connectivity from a station to an AP does not work reliably until traffic is initiated by the AP.

This follow-up commit is necessary to restore correct network functionality for ath12k clients on 6.12.y.

Note: The patch has been modified to apply cleanly, including adjustments for API changes. The copyright header change has been omitted.

drivers/net/wireless/ath/ath12k/dp_rx.c | 5 +++++ drivers/net/wireless/ath/ath12k/peer.c | 3 +++ drivers/net/wireless/ath/ath12k/peer.h | 2 ++ 3 files changed, 10 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index eebdcc16e8fc..1c0d796ffc7a 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -2214,6 +2214,11 @@ static void ath12k_dp_rx_h_mpdu(struct ath12k *ar, spin_lock_bh(&ar->ab->base_lock); peer = ath12k_dp_rx_h_find_peer(ar->ab, msdu); if (peer) { + /* resetting mcbc bit because mcbc packets are unicast + * packets only for AP as STA sends unicast packets. + */ + rxcb->is_mcbc = rxcb->is_mcbc && !peer->ucast_ra_only; + if (rxcb->is_mcbc) enctype = peer->sec_type_grp; else diff --git a/drivers/net/wireless/ath/ath12k/peer.c b/drivers/net/wireless/ath/ath12k/peer.c index 19c0626fbff1..461749b0f732 100644 --- a/drivers/net/wireless/ath/ath12k/peer.c +++ b/drivers/net/wireless/ath/ath12k/peer.c @@ -331,6 +331,9 @@ int ath12k_peer_create(struct ath12k *ar, struct ath12k_vif *arvif, arvif->ast_idx = peer->hw_peer_id; }

+ if (arvif->vif->type == NL80211_IFTYPE_AP) + peer->ucast_ra_only = true; + peer->sec_type = HAL_ENCRYPT_TYPE_OPEN; peer->sec_type_grp = HAL_ENCRYPT_TYPE_OPEN;

diff --git a/drivers/net/wireless/ath/ath12k/peer.h b/drivers/net/wireless/ath/ath12k/peer.h index 7b3500b5c8c2..05d4fdd3f82d 100644 --- a/drivers/net/wireless/ath/ath12k/peer.h +++ b/drivers/net/wireless/ath/ath12k/peer.h @@ -47,6 +47,8 @@ struct ath12k_peer {

/* protected by ab->data_lock */ bool dp_setup_done; + + bool ucast_ra_only; };

void ath12k_peer_unmap_event(struct ath12k_base *ab, u16 peer_id); -- 2.39.5