linux-kernel - [net-next RFC PATCH 1/6] net: dsa: tag

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Message-Id: <20211207145942.7444-2-ansuelsmth@gmail.com>
Date:   Tue,  7 Dec 2021 15:59:37 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [net-next RFC PATCH 1/6] net: dsa: tag_qca: convert to FIELD macro

Convert driver to FIELD macro to drop redundant define.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 net/dsa/tag_qca.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 1ea9401b8ace..55fa6b96b4eb 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -4,29 +4,24 @@
  */
 
 #include <linux/etherdevice.h>
+#include <linux/bitfield.h>
 
 #include "dsa_priv.h"
 
 #define QCA_HDR_LEN	2
 #define QCA_HDR_VERSION	0x2
 
-#define QCA_HDR_RECV_VERSION_MASK	GENMASK(15, 14)
-#define QCA_HDR_RECV_VERSION_S		14
-#define QCA_HDR_RECV_PRIORITY_MASK	GENMASK(13, 11)
-#define QCA_HDR_RECV_PRIORITY_S		11
-#define QCA_HDR_RECV_TYPE_MASK		GENMASK(10, 6)
-#define QCA_HDR_RECV_TYPE_S		6
+#define QCA_HDR_RECV_VERSION		GENMASK(15, 14)
+#define QCA_HDR_RECV_PRIORITY		GENMASK(13, 11)
+#define QCA_HDR_RECV_TYPE		GENMASK(10, 6)
 #define QCA_HDR_RECV_FRAME_IS_TAGGED	BIT(3)
-#define QCA_HDR_RECV_SOURCE_PORT_MASK	GENMASK(2, 0)
-
-#define QCA_HDR_XMIT_VERSION_MASK	GENMASK(15, 14)
-#define QCA_HDR_XMIT_VERSION_S		14
-#define QCA_HDR_XMIT_PRIORITY_MASK	GENMASK(13, 11)
-#define QCA_HDR_XMIT_PRIORITY_S		11
-#define QCA_HDR_XMIT_CONTROL_MASK	GENMASK(10, 8)
-#define QCA_HDR_XMIT_CONTROL_S		8
+#define QCA_HDR_RECV_SOURCE_PORT	GENMASK(2, 0)
+
+#define QCA_HDR_XMIT_VERSION		GENMASK(15, 14)
+#define QCA_HDR_XMIT_PRIORITY		GENMASK(13, 11)
+#define QCA_HDR_XMIT_CONTROL		GENMASK(10, 8)
 #define QCA_HDR_XMIT_FROM_CPU		BIT(7)
-#define QCA_HDR_XMIT_DP_BIT_MASK	GENMASK(6, 0)
+#define QCA_HDR_XMIT_DP_BIT		GENMASK(6, 0)
 
 static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 {
@@ -40,8 +35,9 @@ static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 	phdr = dsa_etype_header_pos_tx(skb);
 
 	/* Set the version field, and set destination port information */
-	hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
-		QCA_HDR_XMIT_FROM_CPU | BIT(dp->index);
+	hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
+	hdr |= QCA_HDR_XMIT_FROM_CPU;
+	hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
 
 	*phdr = htons(hdr);
 
@@ -62,7 +58,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 	hdr = ntohs(*phdr);
 
 	/* Make sure the version is correct */
-	ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
+	ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
 	if (unlikely(ver != QCA_HDR_VERSION))
 		return NULL;
 
@@ -71,7 +67,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 	dsa_strip_etype_header(skb, QCA_HDR_LEN);
 
 	/* Get source port information */
-	port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
+	port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
 
 	skb->dev = dsa_master_find_slave(dev, 0, port);
 	if (!skb->dev)
-- 
2.32.0