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[Qemu-devel] [PATCH V7 1/6] Adding utility function net_checksum_add_con
From: |
Dmitry Fleytman |
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 |
Date: |
Fri, 16 Nov 2012 15:55:30 +0200 |
Adding utility function net_raw_checksum() that calculates checksum
of buffer given
Signed-off-by: Dmitry Fleytman <address@hidden>
Signed-off-by: Yan Vugenfirer <address@hidden>
---
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 <stdint.h>
-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
- [Qemu-devel] [PATCH V7 0/6] VMXNET3 paravirtual NIC device implementation, Dmitry Fleytman, 2012/11/16
- [Qemu-devel] [PATCH V7 1/6] Adding utility function net_checksum_add_cont() that allows checksum calculation of scattered data with odd chunk sizes,
Dmitry Fleytman <=
- [Qemu-devel] [PATCH V7 2/6] Adding utility function iov_net_csum_add() for iovec checksum calculation Adding utility function iov_rebuild() for smart iovec copy, Dmitry Fleytman, 2012/11/16
- [Qemu-devel] [PATCH V7 3/6] Adding common definitions for VMWARE devices, Dmitry Fleytman, 2012/11/16
- [Qemu-devel] [PATCH V7 4/6] Adding common code for VMWARE network devices, Dmitry Fleytman, 2012/11/16
- [Qemu-devel] [PATCH V7 5/6] Adding packet abstraction for VMWARE network devices, Dmitry Fleytman, 2012/11/16
- [Qemu-devel] [PATCH V7 6/6] Adding VMXNET3 device implementation, Dmitry Fleytman, 2012/11/16
- Re: [Qemu-devel] [PATCH V7 0/6] VMXNET3 paravirtual NIC device implementation, Stefan Hajnoczi, 2012/11/21