linux-kernel - [PATCH net-next 3/3] net: emaclite: Remove custom BUFFER

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Date:   Thu, 14 Apr 2022 18:07:11 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <andrew@...n.ch>
CC:     <michal.simek@...inx.com>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>,
        Shravya Kumbham <shravya.kumbham@...inx.com>,
        "Radhey Shyam Pandey" <radhey.shyam.pandey@...inx.com>
Subject: [PATCH net-next 3/3] net: emaclite: Remove custom BUFFER_ALIGN macro

From: Shravya Kumbham <shravya.kumbham@...inx.com>

BUFFER_ALIGN macro is used to calculate the number of bytes
required for the next alignment. Instead of this, we can directly
use the skb_reserve(skb, NET_IP_ALIGN) to make the protocol header
buffer aligned on at least a 4-byte boundary, where the NET_IP_ALIGN
is by default defined as 2. So removing the BUFFER_ALIGN and its
related defines which it can be done by the skb_reserve() itself.

Signed-off-by: Shravya Kumbham <shravya.kumbham@...inx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index bb9c3ebde522..7a86ae82fcc1 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -91,10 +91,6 @@
 #define XEL_HEADER_IP_LENGTH_OFFSET	16	/* IP Length Offset */
 
 #define TX_TIMEOUT		(60 * HZ)	/* Tx timeout is 60 seconds. */
-#define ALIGNMENT		4
-
-/* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
-#define BUFFER_ALIGN(adr) ((ALIGNMENT - ((uintptr_t)adr)) % ALIGNMENT)
 
 #ifdef __BIG_ENDIAN
 #define xemaclite_readl		ioread32be
@@ -595,11 +591,10 @@ static void xemaclite_rx_handler(struct net_device *dev)
 {
 	struct net_local *lp = netdev_priv(dev);
 	struct sk_buff *skb;
-	unsigned int align;
 	u32 len;
 
 	len = ETH_FRAME_LEN + ETH_FCS_LEN;
-	skb = netdev_alloc_skb(dev, len + ALIGNMENT);
+	skb = netdev_alloc_skb(dev, len + NET_IP_ALIGN);
 	if (!skb) {
 		/* Couldn't get memory. */
 		dev->stats.rx_dropped++;
@@ -607,16 +602,7 @@ static void xemaclite_rx_handler(struct net_device *dev)
 		return;
 	}
 
-	/* A new skb should have the data halfword aligned, but this code is
-	 * here just in case that isn't true. Calculate how many
-	 * bytes we should reserve to get the data to start on a word
-	 * boundary
-	 */
-	align = BUFFER_ALIGN(skb->data);
-	if (align)
-		skb_reserve(skb, align);
-
-	skb_reserve(skb, 2);
+	skb_reserve(skb, NET_IP_ALIGN);
 
 	len = xemaclite_recv_data(lp, (u8 *)skb->data, len);
 
-- 
2.7.4