[09/11] wifi: ath12k: use tail MSDU to get MSDU information

Commit Message

Kang Yang July 25, 2024, noon UTC

From: Kang Yang <[e-mail]>

When receiving a packet in monitor mode, hardware will fill status
information msdu_end for MSDUs. Then host can use these status
information to get specific information about this packet, such as
l3 offset, bandwidth, mcs, packet type.

If this packet is composed of multiple MSDUs, then hardware will only
fill status information for the last(tail) MSDU. At this time,
MSDU information is uncertain for others MSDUs. But current code use
the first MSDU in monitor mode, so will get the wrong information.

Fix it by getting msdu information from last(tail) msdu.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Kang Yang <[e-mail]>
---
 drivers/net/wireless/ath/ath12k/dp_mon.c | 41 +++++++++++++-----------
 1 file changed, 23 insertions(+), 18 deletions(-)

Comments

Jeff Johnson July 26, 2024, 12:17 a.m. UTC | #1

On 7/25/2024 5:00 AM, kangyang wrote:
> From: Kang Yang <[e-mail]>
> 
> When receiving a packet in monitor mode, hardware will fill status
> information msdu_end for MSDUs. Then host can use these status
> information to get specific information about this packet, such as
> l3 offset, bandwidth, mcs, packet type.
> 
> If this packet is composed of multiple MSDUs, then hardware will only
> fill status information for the last(tail) MSDU. At this time,
> MSDU information is uncertain for others MSDUs. But current code use
> the first MSDU in monitor mode, so will get the wrong information.
> 
> Fix it by getting msdu information from last(tail) msdu.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> 
> Signed-off-by: Kang Yang <[e-mail]>
Acked-by: Jeff Johnson <[e-mail]>

Patch

diff --git a/drivers/net/wireless/ath/ath12k/dp_mon.c b/drivers/net/wireless/ath/ath12k/dp_mon.c
index 5fc78b34b1a8..1f989bcf795b 100644
--- a/drivers/net/wireless/ath/ath12k/dp_mon.c
+++ b/drivers/net/wireless/ath/ath12k/dp_mon.c
@@ -852,24 +852,26 @@  ath12k_dp_mon_rx_parse_status_tlv(struct ath12k_base *ab,
 	return HAL_RX_MON_STATUS_PPDU_NOT_DONE;
 }
 
-static void ath12k_dp_mon_rx_msdus_set_payload(struct ath12k *ar, struct sk_buff *msdu)
+static void ath12k_dp_mon_rx_msdus_set_payload(struct ath12k *ar,
+					       struct sk_buff *head_msdu,
+					       struct sk_buff *tail_msdu)
 {
 	u32 rx_pkt_offset, l2_hdr_offset;
 
 	rx_pkt_offset = ar->ab->hal.hal_desc_sz;
-	l2_hdr_offset = ath12k_dp_rx_h_l3pad(ar->ab,
-					     (struct hal_rx_desc *)msdu->data);
-	skb_pull(msdu, rx_pkt_offset + l2_hdr_offset);
+	l2_hdr_offset =
+		ath12k_dp_rx_h_l3pad(ar->ab, (struct hal_rx_desc *)tail_msdu->data);
+	skb_pull(head_msdu, rx_pkt_offset + l2_hdr_offset);
 }
 
 static struct sk_buff *
-ath12k_dp_mon_rx_merg_msdus(struct ath12k *ar,
-			    u32 mac_id, struct sk_buff *head_msdu,
+ath12k_dp_mon_rx_merg_msdus(struct ath12k *ar, u32 mac_id,
+			    struct sk_buff *head_msdu, struct sk_buff *tail_msdu,
 			    struct ieee80211_rx_status *rxs, bool *fcs_err)
 {
 	struct ath12k_base *ab = ar->ab;
 	struct sk_buff *msdu, *mpdu_buf, *prev_buf;
-	struct hal_rx_desc *rx_desc;
+	struct hal_rx_desc *rx_desc, *tail_rx_desc;
 	u8 *hdr_desc, *dest, decap_format;
 	struct ieee80211_hdr_3addr *wh;
 	u32 err_bitmap;
@@ -880,23 +882,24 @@  ath12k_dp_mon_rx_merg_msdus(struct ath12k *ar,
 		goto err_merge_fail;
 
 	rx_desc = (struct hal_rx_desc *)head_msdu->data;
-	err_bitmap = ath12k_dp_rx_h_mpdu_err(ab, rx_desc);
+	tail_rx_desc = (struct hal_rx_desc *)tail_msdu->data;
 
+	err_bitmap = ath12k_dp_rx_h_mpdu_err(ab, tail_rx_desc);
 	if (err_bitmap & HAL_RX_MPDU_ERR_FCS)
 		*fcs_err = true;
 
-	decap_format = ath12k_dp_rx_h_decap_type(ab, rx_desc);
+	decap_format = ath12k_dp_rx_h_decap_type(ab, tail_rx_desc);
 
-	ath12k_dp_rx_h_ppdu(ar, rx_desc, rxs);
+	ath12k_dp_rx_h_ppdu(ar, tail_rx_desc, rxs);
 
 	if (decap_format == DP_RX_DECAP_TYPE_RAW) {
-		ath12k_dp_mon_rx_msdus_set_payload(ar, head_msdu);
+		ath12k_dp_mon_rx_msdus_set_payload(ar, head_msdu, tail_msdu);
 
 		prev_buf = head_msdu;
 		msdu = head_msdu->next;
 
 		while (msdu) {
-			ath12k_dp_mon_rx_msdus_set_payload(ar, msdu);
+			ath12k_dp_mon_rx_msdus_set_payload(ar, msdu, tail_msdu);
 
 			prev_buf = msdu;
 			msdu = msdu->next;
@@ -921,7 +924,7 @@  ath12k_dp_mon_rx_merg_msdus(struct ath12k *ar,
 		msdu = head_msdu;
 
 		while (msdu) {
-			ath12k_dp_mon_rx_msdus_set_payload(ar, msdu);
+			ath12k_dp_mon_rx_msdus_set_payload(ar, msdu, tail_msdu);
 			if (qos_pkt) {
 				dest = skb_push(msdu, sizeof(__le16));
 				if (!dest)
@@ -1127,7 +1130,7 @@  static void ath12k_dp_mon_rx_deliver_msdu(struct ath12k *ar, struct napi_struct
 }
 
 static int ath12k_dp_mon_rx_deliver(struct ath12k *ar, u32 mac_id,
-				    struct sk_buff *head_msdu,
+				    struct sk_buff *head_msdu, struct sk_buff *tail_msdu,
 				    struct hal_rx_mon_ppdu_info *ppduinfo,
 				    struct napi_struct *napi)
 {
@@ -1136,7 +1139,8 @@  static int ath12k_dp_mon_rx_deliver(struct ath12k *ar, u32 mac_id,
 	struct ieee80211_rx_status *rxs = &dp->rx_status;
 	bool fcs_err = false;
 
-	mon_skb = ath12k_dp_mon_rx_merg_msdus(ar, mac_id, head_msdu,
+	mon_skb = ath12k_dp_mon_rx_merg_msdus(ar, mac_id,
+					      head_msdu, tail_msdu,
 					      rxs, &fcs_err);
 	if (!mon_skb)
 		goto mon_deliver_fail;
@@ -1244,7 +1248,7 @@  ath12k_dp_mon_rx_parse_mon_status(struct ath12k *ar,
 
 		if (head_msdu && tail_msdu) {
 			ath12k_dp_mon_rx_deliver(ar, mac_id, head_msdu,
-						 ppdu_info, napi);
+						 tail_msdu, ppdu_info, napi);
 		}
 
 		kfree(mon_mpdu);
@@ -1940,15 +1944,16 @@  ath12k_dp_mon_tx_process_ppdu_info(struct ath12k *ar, int mac_id,
 				   struct dp_mon_tx_ppdu_info *tx_ppdu_info)
 {
 	struct dp_mon_mpdu *tmp, *mon_mpdu;
-	struct sk_buff *head_msdu;
+	struct sk_buff *head_msdu, *tail_msdu;
 
 	list_for_each_entry_safe(mon_mpdu, tmp,
 				 &tx_ppdu_info->dp_tx_mon_mpdu_list, list) {
 		list_del(&mon_mpdu->list);
 		head_msdu = mon_mpdu->head;
+		tail_msdu = mon_mpdu->tail;
 
 		if (head_msdu)
-			ath12k_dp_mon_rx_deliver(ar, mac_id, head_msdu,
+			ath12k_dp_mon_rx_deliver(ar, mac_id, head_msdu, tail_msdu,
 						 &tx_ppdu_info->rx_status, napi);
 
 		kfree(mon_mpdu);