From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:52700) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TZMbf-0003XS-7o for qemu-devel@nongnu.org; Fri, 16 Nov 2012 09:09:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TZMbc-0008Hc-5Y for qemu-devel@nongnu.org; Fri, 16 Nov 2012 09:09:19 -0500 Received: from mail-wi0-f175.google.com ([209.85.212.175]:49404) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TZMbb-0008HS-VB for qemu-devel@nongnu.org; Fri, 16 Nov 2012 09:09:16 -0500 Received: by mail-wi0-f175.google.com with SMTP id x18so3174444wia.10 for ; Fri, 16 Nov 2012 06:09:15 -0800 (PST) From: Dmitry Fleytman Date: Fri, 16 Nov 2012 15:55:30 +0200 Message-Id: <1353074135-9674-2-git-send-email-dmitry@daynix.com> In-Reply-To: <1353074135-9674-1-git-send-email-dmitry@daynix.com> References: <1353074135-9674-1-git-send-email-dmitry@daynix.com> Subject: [Qemu-devel] [PATCH V7 1/6] Adding utility function net_checksum_add_cont() that allows checksum calculation of scattered data with odd chunk sizes List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Dmitry Fleytman , Yan Vugenfirer , Gerhard Wiesinger Adding utility function net_raw_checksum() that calculates checksum of buffer given Signed-off-by: Dmitry Fleytman Signed-off-by: Yan Vugenfirer --- net/checksum.c | 13 +++++++------ net/checksum.h | 14 +++++++++++++- 2 files changed, 20 insertions(+), 7 deletions(-) diff --git a/net/checksum.c b/net/checksum.c index 9919b2e..4fa5563 100644 --- a/net/checksum.c +++ b/net/checksum.c @@ -20,16 +20,17 @@ #define PROTO_TCP 6 #define PROTO_UDP 17 -uint32_t net_checksum_add(int len, uint8_t *buf) +uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq) { uint32_t sum = 0; int i; - for (i = 0; i < len; i++) { - if (i & 1) - sum += (uint32_t)buf[i]; - else - sum += (uint32_t)buf[i] << 8; + for (i = seq; i < seq + len; i++) { + if (i & 1) { + sum += (uint32_t)buf[i - seq]; + } else { + sum += (uint32_t)buf[i - seq] << 8; + } } return sum; } diff --git a/net/checksum.h b/net/checksum.h index 1f05298..171924c 100644 --- a/net/checksum.h +++ b/net/checksum.h @@ -20,10 +20,22 @@ #include -uint32_t net_checksum_add(int len, uint8_t *buf); +uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq); uint16_t net_checksum_finish(uint32_t sum); uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto, uint8_t *addrs, uint8_t *buf); void net_checksum_calculate(uint8_t *data, int length); +static inline uint32_t +net_checksum_add(int len, uint8_t *buf) +{ + return net_checksum_add_cont(len, buf, 0); +} + +static inline uint16_t +net_raw_checksum(uint8_t *data, int length) +{ + return net_checksum_finish(net_checksum_add(length, data)); +} + #endif /* QEMU_NET_CHECKSUM_H */ -- 1.7.11.7