ath10k: fix fw stats processing

If stat data exceeds wmi-htc buffer limits
firmware splits it into many wmi stats update
events which are delivered in a ping-pong fashion
triggered by wmi stats request command.

Since there's only an implicit start-of-data and
no end-of-data indications the driver has to
perform some trickery to get complete stat data.

kvalo: use %zu to fix a compiler warning and fix a typo in a comment
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/core.h

@@ -117,13 +117,17 @@ struct ath10k_wmi {
 };
 
 struct ath10k_fw_stats_peer {
+	struct list_head list;
+
 	u8 peer_macaddr[ETH_ALEN];
 	u32 peer_rssi;
 	u32 peer_tx_rate;
 	u32 peer_rx_rate; /* 10x only */
 };
 
-struct ath10k_fw_stats {
+struct ath10k_fw_stats_pdev {
+	struct list_head list;
+
 	/* PDEV stats */
 	s32 ch_noise_floor;
 	u32 tx_frame_count;
@@ -178,15 +182,11 @@ struct ath10k_fw_stats {
 	s32 phy_errs;
 	s32 phy_err_drop;
 	s32 mpdu_errs;
+};
 
-	/* VDEV STATS */
-
-	/* PEER STATS */
-	u8 peers;
-	struct ath10k_fw_stats_peer peer_stat[TARGET_NUM_PEERS];
-
-	/* TODO: Beacon filter stats */
-
+struct ath10k_fw_stats {
+	struct list_head pdevs;
+	struct list_head peers;
 };
 
 struct ath10k_dfs_stats {
@@ -294,6 +294,7 @@ struct ath10k_debug {
 
 	struct ath10k_fw_stats fw_stats;
 	struct completion fw_stats_complete;
+	bool fw_stats_done;
 	DECLARE_BITMAP(wmi_service_bitmap, WMI_SERVICE_MAX);
 
 	unsigned long htt_stats_mask;

drivers/net/wireless/ath/ath10k/wmi.c

@@ -1330,7 +1330,7 @@ static int ath10k_wmi_event_debug_mesg(struct ath10k *ar, struct sk_buff *skb)
 }
 
 static void ath10k_wmi_pull_pdev_stats(const struct wmi_pdev_stats *src,
-				       struct ath10k_fw_stats *dst)
+				       struct ath10k_fw_stats_pdev *dst)
 {
 	const struct wal_dbg_tx_stats *tx = &src->wal.tx;
 	const struct wal_dbg_rx_stats *rx = &src->wal.rx;
@@ -1405,26 +1405,38 @@ static int ath10k_wmi_main_pull_fw_stats(struct ath10k *ar,
 	num_vdev_stats = __le32_to_cpu(ev->num_vdev_stats);
 	num_peer_stats = __le32_to_cpu(ev->num_peer_stats);
 
-	if (num_pdev_stats) {
+	for (i = 0; i < num_pdev_stats; i++) {
 		const struct wmi_pdev_stats *src;
+		struct ath10k_fw_stats_pdev *dst;
 
 		src = (void *)skb->data;
 		if (!skb_pull(skb, sizeof(*src)))
 			return -EPROTO;
 
-		ath10k_wmi_pull_pdev_stats(src, stats);
+		dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
+		if (!dst)
+			continue;
+
+		ath10k_wmi_pull_pdev_stats(src, dst);
+		list_add_tail(&dst->list, &stats->pdevs);
 	}
 
 	/* fw doesn't implement vdev stats */
 
 	for (i = 0; i < num_peer_stats; i++) {
 		const struct wmi_peer_stats *src;
+		struct ath10k_fw_stats_peer *dst;
 
 		src = (void *)skb->data;
 		if (!skb_pull(skb, sizeof(*src)))
 			return -EPROTO;
 
-		ath10k_wmi_pull_peer_stats(src, &stats->peer_stat[i]);
+		dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
+		if (!dst)
+			continue;
+
+		ath10k_wmi_pull_peer_stats(src, dst);
+		list_add_tail(&dst->list, &stats->peers);
 	}
 
 	return 0;
@@ -1445,36 +1457,49 @@ static int ath10k_wmi_10x_pull_fw_stats(struct ath10k *ar,
 	num_vdev_stats = __le32_to_cpu(ev->num_vdev_stats);
 	num_peer_stats = __le32_to_cpu(ev->num_peer_stats);
 
-	if (num_pdev_stats) {
+	for (i = 0; i < num_pdev_stats; i++) {
 		const struct wmi_10x_pdev_stats *src;
+		struct ath10k_fw_stats_pdev *dst;
 
 		src = (void *)skb->data;
 		if (!skb_pull(skb, sizeof(*src)))
 			return -EPROTO;
 
-		ath10k_wmi_pull_pdev_stats(&src->old, stats);
+		dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
+		if (!dst)
+			continue;
+
+		ath10k_wmi_pull_pdev_stats(&src->old, dst);
+
+		dst->ack_rx_bad = __le32_to_cpu(src->ack_rx_bad);
+		dst->rts_bad = __le32_to_cpu(src->rts_bad);
+		dst->rts_good = __le32_to_cpu(src->rts_good);
+		dst->fcs_bad = __le32_to_cpu(src->fcs_bad);
+		dst->no_beacons = __le32_to_cpu(src->no_beacons);
+		dst->mib_int_count = __le32_to_cpu(src->mib_int_count);
 
-		stats->ack_rx_bad = __le32_to_cpu(src->ack_rx_bad);
-		stats->rts_bad = __le32_to_cpu(src->rts_bad);
-		stats->rts_good = __le32_to_cpu(src->rts_good);
-		stats->fcs_bad = __le32_to_cpu(src->fcs_bad);
-		stats->no_beacons = __le32_to_cpu(src->no_beacons);
-		stats->mib_int_count = __le32_to_cpu(src->mib_int_count);
+		list_add_tail(&dst->list, &stats->pdevs);
 	}
 
 	/* fw doesn't implement vdev stats */
 
 	for (i = 0; i < num_peer_stats; i++) {
 		const struct wmi_10x_peer_stats *src;
+		struct ath10k_fw_stats_peer *dst;
 
 		src = (void *)skb->data;
 		if (!skb_pull(skb, sizeof(*src)))
 			return -EPROTO;
 
-		ath10k_wmi_pull_peer_stats(&src->old, &stats->peer_stat[i]);
+		dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
+		if (!dst)
+			continue;
+
+		ath10k_wmi_pull_peer_stats(&src->old, dst);
+
+		dst->peer_rx_rate = __le32_to_cpu(src->peer_rx_rate);
 
-		stats->peer_stat[i].peer_rx_rate =
-				__le32_to_cpu(src->peer_rx_rate);
+		list_add_tail(&dst->list, &stats->peers);
 	}
 
 	return 0;