Re: [PATCH v4] wifi: ath11k: fix peer resolution on rx path when peer_id=0

[Praneesh P <praneesh.p@oss.qualcomm.com>]

On 4/29/2026 1:06 PM, Baochen Qiang wrote:
>
> On 4/24/2026 5:50 PM, Matthew Leach wrote:
>> It has been observed that on certain chipsets a peer can be assigned
>> peer_id=0. For reception of non-aggregated MPDUs this is fine as
>> ath11k_dp_rx_h_find_peer() has a fallback case where it locates the peer
>> based upon the source MAC address. On an aggregated link, the mpdu_start
>> header is only populated by hardware on the first sub-MSDU. This causes
>> the peer resolution to be skipped for the subsequent MSDUs and the
>> encryption type of these frames to be set to an incorrect value,
>> resulting in these MSDUs being dropped by ieee80211.
>>
>> ath11k_pci 0000:03:00.0: data rx skb 000000002f4b704d len 1534 peer xx:xx:xx:xx:xx:xx 0 ucast sn 3063 he160 rate_idx 9 vht_nss 2 freq 5240 band 1 flag 0x40d1a fcs-err 0 mic-err 0 amsdu-more 0 peer_id 0 first_msdu 1 last_msdu 0
>> ath11k_pci 0000:03:00.0: data rx skb 0000000038acd580 len 1534 peer (null) 0 ucast sn 3063 he160 rate_idx 9 vht_nss 2 freq 5240 band 1 flag 0x40d00 fcs-err 0 mic-err 0 amsdu-more 0 peer_id 0 first_msdu 0 last_msdu 1
>>
>> Remove the null peer_id checks in ath11k_dp_rx_h_find_peer() and
>> ath11k_hal_rx_parse_mon_status_tlv(), allowing peers with an assigned ID
>> of 0 to be resolved.
>>
>> Fixes: 2167fa606c0f ("ath11k: Add support for RX decapsulation offload")
>> Tested-on: QCA2066 hw2.1 PCI WLAN.HSP.1.1-03926.13-QCAHSPSWPL_V2_SILICONZ_CE-2.52297.9
> Tested-on: is not an official tag but is ath driver specific, so generally it is put above
> all official tags:
>
> Tested-on: ...
> <blank line>
> Fixes: ...
> s-o-b: ...
>
> But since this is trivial I think Jeff can make the change when he merges it, so no need
> to respin just for it.
For QCN9074, IPQ8074, IPQ5018 and IPQ6018, Peer_id 0 is not a expected 
value. Like ath12k, it is better to handle it through hw_params.
>> Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
>> Signed-off-by: Matthew Leach <matthew.leach@collabora.com>
>> ---
>> Changes in v4:
>> - Prefix subsystem with 'wifi:'.
>> - Added the 'Tested-by' and 'Fixes' trailers.
>> - Link to v3: https://patch.msgid.link/20260417-ath11k-null-peerid-workaround-v3-1-d04302284486@collabora.com
>>
>> Changes in v3:
>> - Clarified that the mpdu_start header isn't populated by the h/w for
>>    all sub-MSDUs in the commit message.
>> - Fix second null-peer check in ath11k_hal_rx_parse_mon_status_tlv().
>> - Link to v2: https://patch.msgid.link/20260415-ath11k-null-peerid-workaround-v2-1-2abae3bbac16@collabora.com
>>
>> Changes in v2:
>>
>> - Since peer_id=0 is a valid condition on some chips, remove the guard
>>    that prevented the peer lookup.
>> - Link to v1: https://patch.msgid.link/20260326-ath11k-null-peerid-workaround-v1-1-0c2fd53202f8@collabora.com
>>
>> To: Jeff Johnson <jjohnson@kernel.org>
>> Cc: linux-wireless@vger.kernel.org
>> Cc: ath11k@lists.infradead.org
>> Cc: linux-kernel@vger.kernel.org
>> ---
>>   drivers/net/wireless/ath/ath11k/dp_rx.c  | 3 +--
>>   drivers/net/wireless/ath/ath11k/hal_rx.c | 5 +----
>>   2 files changed, 2 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
>> index 49d959b2e148..ff2c78a4e5f3 100644
>> --- a/drivers/net/wireless/ath/ath11k/dp_rx.c
>> +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
>> @@ -2215,8 +2215,7 @@ ath11k_dp_rx_h_find_peer(struct ath11k_base *ab, struct sk_buff *msdu)
>>   
>>   	lockdep_assert_held(&ab->base_lock);
>>   
>> -	if (rxcb->peer_id)
>> -		peer = ath11k_peer_find_by_id(ab, rxcb->peer_id);
>> +	peer = ath11k_peer_find_by_id(ab, rxcb->peer_id);
>>   
>>   	if (peer)
>>   		return peer;
>> diff --git a/drivers/net/wireless/ath/ath11k/hal_rx.c b/drivers/net/wireless/ath/ath11k/hal_rx.c
>> index 753bd93f0212..51e0840bc0d1 100644
>> --- a/drivers/net/wireless/ath/ath11k/hal_rx.c
>> +++ b/drivers/net/wireless/ath/ath11k/hal_rx.c
>> @@ -1467,11 +1467,8 @@ ath11k_hal_rx_parse_mon_status_tlv(struct ath11k_base *ab,
>>   	case HAL_RX_MPDU_START: {
>>   		struct hal_rx_mpdu_info *mpdu_info =
>>   				(struct hal_rx_mpdu_info *)tlv_data;
>> -		u16 peer_id;
>>   
>> -		peer_id = ath11k_hal_rx_mpduinfo_get_peerid(ab, mpdu_info);
>> -		if (peer_id)
>> -			ppdu_info->peer_id = peer_id;
>> +		ppdu_info->peer_id = ath11k_hal_rx_mpduinfo_get_peerid(ab, mpdu_info);
>>   		break;
>>   	}
>>   	case HAL_RXPCU_PPDU_END_INFO: {
>>
>> ---
>> base-commit: f338e77383789c0cae23ca3d48adcc5e9e137e3c
>> change-id: 20260326-ath11k-null-peerid-workaround-625a129781b1
>>
>> Best regards,
>> --
>> Matt
>>
>