linux-kernel - [PATCH 3.16 197/202] brcmfmac: revise handling events in receive path

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Message-ID: <lsq.1556377989.319831062@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Hante Meuleman" <hante.meuleman@...adcom.com>,
        "Franky Lin" <franky.lin@...adcom.com>,
        "Arend van Spriel" <arend@...adcom.com>,
        "Pieter-Paul Giesberts" <pieter-paul.giesberts@...adcom.com>
Subject: [PATCH 3.16 197/202] brcmfmac: revise handling events in receive path

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arend van Spriel <arend@...adcom.com>

commit 9c349892ccc90c6de2baaa69cc78449f58082273 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@...adcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>
Reviewed-by: Franky Lin <franky.lin@...adcom.com>
Signed-off-by: Arend van Spriel <arend@...adcom.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.16 as dependency of commit a4176ec356c7
 "brcmfmac: add subtype check for event handling in data path"
 - Drop changes to PCIe bus support
 - Adjust filenames]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_bus.h
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_bus.h
@@ -168,7 +168,7 @@ bool brcmf_c_prec_enq(struct device *dev
 		      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);
 
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
@@ -306,18 +306,11 @@ void brcmf_txflowblock(struct device *de
 	brcmf_fws_bus_blocked(drvr, state);
 }
 
-static void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb,
-			    bool handle_event)
+static 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;
@@ -377,7 +370,7 @@ static void brcmf_rxreorder_process_info
 	/* 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;
 	}
 
@@ -389,7 +382,7 @@ static void brcmf_rxreorder_process_info
 		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;
 		}
 
@@ -414,7 +407,7 @@ static void brcmf_rxreorder_process_info
 		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;
 		}
 
@@ -528,11 +521,11 @@ static void brcmf_rxreorder_process_info
 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);
@@ -552,11 +545,18 @@ void brcmf_rx_frame(struct device *dev,
 		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)