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 if CONFIG_NET is defined. Many boards do not enable that 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 ---
Changes in v4: - Expand commit message to better explain the need to checksum functions
Changes in v3: None Changes in v2: None
lib/Makefile | 2 +- lib/net_utils.c | 48 ++++++++++++++++++++++++++++++++++++++++ net/Makefile | 1 - net/checksum.c | 59 ------------------------------------------------- 4 files changed, 49 insertions(+), 61 deletions(-) delete mode 100644 net/checksum.c
diff --git a/lib/Makefile b/lib/Makefile index 0c89b4896f..505527d58a 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -76,7 +76,7 @@ endif ifdef CONFIG_SPL_BUILD obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o obj-$(CONFIG_$(SPL_TPL_)HASH_SUPPORT) += crc16.o -obj-$(CONFIG_SPL_NET_SUPPORT) += net_utils.o +obj-y += net_utils.o endif obj-$(CONFIG_ADDR_MAP) += addr_map.o obj-y += qsort.o diff --git a/lib/net_utils.c b/lib/net_utils.c index 9fb9d4a4b0..252290210f 100644 --- a/lib/net_utils.c +++ b/lib/net_utils.c @@ -41,3 +41,51 @@ struct in_addr string_to_ip(const char *s) addr.s_addr = htonl(addr.s_addr); return addr; } + +uint compute_ip_checksum(const void *vptr, uint nbytes) +{ + int sum, oddbyte; + const unsigned short *ptr = vptr; + + sum = 0; + while (nbytes > 1) { + sum += *ptr++; + nbytes -= 2; + } + if (nbytes == 1) { + oddbyte = 0; + ((u8 *)&oddbyte)[0] = *(u8 *)ptr; + ((u8 *)&oddbyte)[1] = 0; + sum += oddbyte; + } + sum = (sum >> 16) + (sum & 0xffff); + sum += (sum >> 16); + sum = ~sum & 0xffff; + + return sum; +} + +uint add_ip_checksums(uint offset, uint sum, uint new) +{ + ulong checksum; + + sum = ~sum & 0xffff; + new = ~new & 0xffff; + if (offset & 1) { + /* + * byte-swap the sum if it came from an odd offset; since the + * computation is endian-independent this works. + */ + new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00); + } + checksum = sum + new; + if (checksum > 0xffff) + checksum -= 0xffff; + + return (~checksum) & 0xffff; +} + +int ip_checksum_ok(const void *addr, uint nbytes) +{ + return !(compute_ip_checksum(addr, nbytes) & 0xfffe); +} diff --git a/net/Makefile b/net/Makefile index 2a700c8401..fef71b940a 100644 --- a/net/Makefile +++ b/net/Makefile @@ -5,7 +5,6 @@
#ccflags-y += -DDEBUG
-obj-y += checksum.o obj-$(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 16ef416356..0000000000 --- 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); -}