net: Move the checksum functions to lib/

These functions are used by code outside the network support, so move them
to lib/ to be more accessible.

Without this, the functions are only accessible in SPL/TPL only if
CONFIG_SPL/TPL_NET are defined. Many boards do not enable those option but
still want to do checksums in this format.

Fix up a few code-style nits while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 0 insertions, 60 deletions

diff --git a/net/Makefile b/net/Makefile
index 2a700c8..fef71b9 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -5,7 +5,6 @@
 
 #ccflags-y += -DDEBUG
 
-obj-y += checksum.o
 obj-$(CONFIG_NET)      += arp.o
 obj-$(CONFIG_CMD_BOOTP) += bootp.o
 obj-$(CONFIG_CMD_CDP)  += cdp.o
diff --git a/net/checksum.c b/net/checksum.c
deleted file mode 100644
index 16ef416..0000000
--- a/net/checksum.c
+++ /dev/null
@@ -1,59 +0,0 @@
-// SPDX-License-Identifier: BSD-2-Clause
-/*
- * This file was originally taken from the FreeBSD project.
- *
- * Copyright (c) 2001 Charles Mott <cm@linktel.net>
- * Copyright (c) 2008 coresystems GmbH
- * All rights reserved.
- */
-
-#include <common.h>
-#include <net.h>
-
-unsigned compute_ip_checksum(const void *vptr, unsigned nbytes)
-{
-	int sum, oddbyte;
-	const unsigned short *ptr = vptr;
-
-	sum = 0;
-	while (nbytes > 1) {
-		sum += *ptr++;
-		nbytes -= 2;
-	}
-	if (nbytes == 1) {
-		oddbyte = 0;
-		((u8 *)&oddbyte)[0] = *(u8 *)ptr;
-		((u8 *)&oddbyte)[1] = 0;
-		sum += oddbyte;
-	}
-	sum = (sum >> 16) + (sum & 0xffff);
-	sum += (sum >> 16);
-	sum = ~sum & 0xffff;
-
-	return sum;
-}
-
-unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new)
-{
-	unsigned long checksum;
-
-	sum = ~sum & 0xffff;
-	new = ~new & 0xffff;
-	if (offset & 1) {
-		/*
-		 * byte-swap the sum if it came from an odd offset; since the
-		 * computation is endian independant this works.
-		 */
-		new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
-	}
-	checksum = sum + new;
-	if (checksum > 0xffff)
-		checksum -= 0xffff;
-
-	return (~checksum) & 0xffff;
-}
-
-int ip_checksum_ok(const void *addr, unsigned nbytes)
-{
-	return !(compute_ip_checksum(addr, nbytes) & 0xfffe);
-}