wil6210: drop Rx packets with L2 error indication from HW

Due to recent change in FW, driver will be notified of corrupted Rx
packets (e.g. MIC error).
Drop such packets before they are delivered to network stack.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/txrx.c

@@ -678,6 +678,21 @@ static int wil_rx_crypto_check(struct wil6210_priv *wil, struct sk_buff *skb)
 	return 0;
 }
 
+static int wil_rx_error_check(struct wil6210_priv *wil, struct sk_buff *skb,
+			      struct wil_net_stats *stats)
+{
+	struct vring_rx_desc *d = wil_skb_rxdesc(skb);
+
+	if ((d->dma.status & RX_DMA_STATUS_ERROR) &&
+	    (d->dma.error & RX_DMA_ERROR_MIC)) {
+		stats->rx_mic_error++;
+		wil_dbg_txrx(wil, "MIC error, dropping packet\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
 static void wil_get_netif_rx_params(struct sk_buff *skb, int *cid,
 				    int *security)
 {
@@ -736,6 +751,12 @@ void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 		goto stats;
 	}
 
+	/* check errors reported by HW and update statistics */
+	if (unlikely(wil->txrx_ops.rx_error_check(wil, skb, stats))) {
+		dev_kfree_skb(skb);
+		return;
+	}
+
 	if (wdev->iftype == NL80211_IFTYPE_AP && !vif->ap_isolate) {
 		if (mcast) {
 			/* send multicast frames both to higher layers in
@@ -2212,6 +2233,7 @@ void wil_init_txrx_ops_legacy_dma(struct wil6210_priv *wil)
 	wil->txrx_ops.get_netif_rx_params =
 		wil_get_netif_rx_params;
 	wil->txrx_ops.rx_crypto_check = wil_rx_crypto_check;
+	wil->txrx_ops.rx_error_check = wil_rx_error_check;
 	wil->txrx_ops.is_rx_idle = wil_is_rx_idle;
 	wil->txrx_ops.rx_fini = wil_rx_fini;
 }