brcmfmac: revise handling events in receive path

BugLink: https://bugs.launchpad.net/bugs/1832661

commit 9c349892 upstream.

Move event handling out of brcmf_netif_rx() avoiding the need
to pass a flag. This flag is only ever true for USB hosts as
other interface use separate brcmf_rx_event() function.
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[bwh: Backported to 4.4 as dependency of commit a4176ec3
 "brcmfmac: add subtype check for event handling in data path"
 - Adjust filenames, context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/net/wireless/brcm80211/brcmfmac/bus.h

@@ -214,7 +214,7 @@ bool brcmf_c_prec_enq(struct device *dev, struct pktq *q, struct sk_buff *pkt,
 		      int prec);
 
 /* Receive frame for delivery to OS.  Callee disposes of rxp. */
-void brcmf_rx_frame(struct device *dev, struct sk_buff *rxp, bool handle_evnt);
+void brcmf_rx_frame(struct device *dev, struct sk_buff *rxp, bool handle_event);
 /* Receive async event packet from firmware. Callee disposes of rxp. */
 void brcmf_rx_event(struct device *dev, struct sk_buff *rxp);
 

drivers/net/wireless/brcm80211/brcmfmac/core.c

@@ -301,18 +301,11 @@ void brcmf_txflowblock(struct device *dev, bool state)
 	brcmf_fws_bus_blocked(drvr, state);
 }
 
-void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb,
-		    bool handle_event)
+void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb)
 {
-	skb->protocol = eth_type_trans(skb, ifp->ndev);
-
 	if (skb->pkt_type == PACKET_MULTICAST)
 		ifp->stats.multicast++;
 
-	/* Process special event packets */
-	if (handle_event)
-		brcmf_fweh_process_skb(ifp->drvr, skb);
-
 	if (!(ifp->ndev->flags & IFF_UP)) {
 		brcmu_pkt_buf_free_skb(skb);
 		return;
@@ -372,7 +365,7 @@ static void brcmf_rxreorder_process_info(struct brcmf_if *ifp, u8 *reorder_data,
 	/* validate flags and flow id */
 	if (flags == 0xFF) {
 		brcmf_err("invalid flags...so ignore this packet\n");
-		brcmf_netif_rx(ifp, pkt, false);
+		brcmf_netif_rx(ifp, pkt);
 		return;
 	}
 
@@ -384,7 +377,7 @@ static void brcmf_rxreorder_process_info(struct brcmf_if *ifp, u8 *reorder_data,
 		if (rfi == NULL) {
 			brcmf_dbg(INFO, "received flags to cleanup, but no flow (%d) yet\n",
 				  flow_id);
-			brcmf_netif_rx(ifp, pkt, false);
+			brcmf_netif_rx(ifp, pkt);
 			return;
 		}
 
@@ -409,7 +402,7 @@ static void brcmf_rxreorder_process_info(struct brcmf_if *ifp, u8 *reorder_data,
 		rfi = kzalloc(buf_size, GFP_ATOMIC);
 		if (rfi == NULL) {
 			brcmf_err("failed to alloc buffer\n");
-			brcmf_netif_rx(ifp, pkt, false);
+			brcmf_netif_rx(ifp, pkt);
 			return;
 		}
 
@@ -523,11 +516,11 @@ static void brcmf_rxreorder_process_info(struct brcmf_if *ifp, u8 *reorder_data,
 netif_rx:
 	skb_queue_walk_safe(&reorder_list, pkt, pnext) {
 		__skb_unlink(pkt, &reorder_list);
-		brcmf_netif_rx(ifp, pkt, false);
+		brcmf_netif_rx(ifp, pkt);
 	}
 }
 
-void brcmf_rx_frame(struct device *dev, struct sk_buff *skb, bool handle_evnt)
+void brcmf_rx_frame(struct device *dev, struct sk_buff *skb, bool handle_event)
 {
 	struct brcmf_if *ifp;
 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
@@ -547,11 +540,18 @@ void brcmf_rx_frame(struct device *dev, struct sk_buff *skb, bool handle_evnt)
 		return;
 	}
 
+	skb->protocol = eth_type_trans(skb, ifp->ndev);
+
 	rd = (struct brcmf_skb_reorder_data *)skb->cb;
-	if (rd->reorder)
+	if (rd->reorder) {
 		brcmf_rxreorder_process_info(ifp, rd->reorder, skb);
-	else
-		brcmf_netif_rx(ifp, skb, handle_evnt);
+	} else {
+		/* Process special event packets */
+		if (handle_event)
+			brcmf_fweh_process_skb(ifp->drvr, skb);
+
+		brcmf_netif_rx(ifp, skb);
+	}
 }
 
 void brcmf_rx_event(struct device *dev, struct sk_buff *skb)

drivers/net/wireless/brcm80211/brcmfmac/core.h

@@ -215,8 +215,7 @@ int brcmf_get_next_free_bsscfgidx(struct brcmf_pub *drvr);
 void brcmf_txflowblock_if(struct brcmf_if *ifp,
 			  enum brcmf_netif_stop_reason reason, bool state);
 void brcmf_txfinalize(struct brcmf_if *ifp, struct sk_buff *txp, bool success);
-void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb,
-		    bool handle_event);
+void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb);
 void brcmf_net_setcarrier(struct brcmf_if *ifp, bool on);
 
 #endif /* BRCMFMAC_CORE_H */

drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c

@@ -1155,7 +1155,7 @@ brcmf_msgbuf_process_rx_complete(struct brcmf_msgbuf *msgbuf, void *buf)
 		brcmu_pkt_buf_free_skb(skb);
 		return;
 	}
-	brcmf_netif_rx(ifp, skb, false);
+	brcmf_netif_rx(ifp, skb);
 }