net/tg3: use crc32() instead of hand-rolled equivalent

The calculation done by calc_crc() is equivalent to
~crc32(~0, buf, len), so just use that instead.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://patch.msgid.link/20250513041402.541527-1-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: ebiggers

drivers/net/ethernet/broadcom/Kconfig

@@ -123,6 +123,7 @@ config TIGON3
 	tristate "Broadcom Tigon3 support"
 	depends on PCI
 	depends on PTP_1588_CLOCK_OPTIONAL
+	select CRC32
 	select PHYLIB
 	help
 	  This driver supports Broadcom Tigon3 based gigabit Ethernet cards.

drivers/net/ethernet/broadcom/tg3.c

@@ -54,7 +54,7 @@
 #include <linux/ssb/ssb_driver_gige.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
-#include <linux/crc32poly.h>
+#include <linux/crc32.h>
 #include <linux/dmi.h>
 
 #include <net/checksum.h>
@@ -9809,26 +9809,7 @@ static void tg3_setup_rxbd_thresholds(struct tg3 *tp)
 
 static inline u32 calc_crc(unsigned char *buf, int len)
 {
-	u32 reg;
-	u32 tmp;
-	int j, k;
-
-	reg = 0xffffffff;
-
-	for (j = 0; j < len; j++) {
-		reg ^= buf[j];
-
-		for (k = 0; k < 8; k++) {
-			tmp = reg & 0x01;
-
-			reg >>= 1;
-
-			if (tmp)
-				reg ^= CRC32_POLY_LE;
-		}
-	}
-
-	return ~reg;
+	return ~crc32(~0, buf, len);
 }
 
 static void tg3_set_multi(struct tg3 *tp, unsigned int accept_all)