linux-kernel - [PATCH] net: ethernet: freescale: Use generic CRC32 implementation

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Message-Id: <20180722124331.22073-1-krzk@kernel.org>
Date:   Sun, 22 Jul 2018 14:43:31 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Fugang Duan <fugang.duan@....com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Eric Biggers <ebiggers3@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH] net: ethernet: freescale: Use generic CRC32 implementation

Use generic kernel CRC32 implementation because it:
1. Should be faster (uses lookup tables),
2. Removes duplicated CRC generation code,
3. Uses well-proven algorithm instead of coding it one more time.

Suggested-by: Eric Biggers <ebiggers3@...il.com>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/net/ethernet/freescale/fec_main.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index c729665107f5..c93261ffa5e8 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2955,7 +2955,7 @@ static void set_multicast_list(struct net_device *ndev)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
 	struct netdev_hw_addr *ha;
-	unsigned int i, bit, data, crc, tmp;
+	unsigned int crc, tmp;
 	unsigned char hash;
 	unsigned int hash_high = 0, hash_low = 0;
 
@@ -2983,15 +2983,7 @@ static void set_multicast_list(struct net_device *ndev)
 	/* Add the addresses in hash register */
 	netdev_for_each_mc_addr(ha, ndev) {
 		/* calculate crc32 value of mac address */
-		crc = 0xffffffff;
-
-		for (i = 0; i < ndev->addr_len; i++) {
-			data = ha->addr[i];
-			for (bit = 0; bit < 8; bit++, data >>= 1) {
-				crc = (crc >> 1) ^
-				(((crc ^ data) & 1) ? CRC32_POLY : 0);
-			}
-		}
+		crc = crc32_le(~0, ha->addr, ndev->addr_len);
 
 		/* only upper 6 bits (FEC_HASH_BITS) are used
 		 * which point to specific bit in the hash registers
-- 
2.14.1