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[Qemu-devel] [PATCH v4 3/9] Adding utility function iov_net_csum_add() f
From: |
Dmitry Fleytman |
Subject: |
[Qemu-devel] [PATCH v4 3/9] Adding utility function iov_net_csum_add() for iovec checksum calculation |
Date: |
Thu, 15 Mar 2012 23:09:02 +0200 |
Signed-off-by: Dmitry Fleytman <address@hidden>
Signed-off-by: Yan Vugenfirer <address@hidden>
---
iov.c | 29 +++++++++++++++++++++++++++++
iov.h | 3 +++
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/iov.c b/iov.c
index 0f96493..5d4f94c 100644
--- a/iov.c
+++ b/iov.c
@@ -16,6 +16,7 @@
*/
#include "iov.h"
+#include "net/checksum.h"
size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
const void *buf, size_t iov_off, size_t size)
@@ -130,3 +131,31 @@ void iov_hexdump(const struct iovec *iov, const unsigned
int iov_cnt,
fprintf(fp, "\n");
}
}
+
+uint32_t
+iov_net_csum_add(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t iov_off, size_t size)
+{
+ size_t iovec_off, buf_off;
+ unsigned int i;
+ uint32_t res = 0;
+ uint32_t seq = 0;
+
+ iovec_off = 0;
+ buf_off = 0;
+ for (i = 0; i < iov_cnt && size; i++) {
+ if (iov_off < (iovec_off + iov[i].iov_len)) {
+ size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
+ void *chunk_buf = iov[i].iov_base + (iov_off - iovec_off);
+
+ res += net_checksum_add_cont(len, chunk_buf, seq);
+ seq += len;
+
+ buf_off += len;
+ iov_off += len;
+ size -= len;
+ }
+ iovec_off += iov[i].iov_len;
+ }
+ return res;
+}
diff --git a/iov.h b/iov.h
index 94d2f78..ba385f5 100644
--- a/iov.h
+++ b/iov.h
@@ -21,3 +21,6 @@ size_t iov_clear(const struct iovec *iov, const unsigned int
iov_cnt,
size_t iov_off, size_t size);
void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
FILE *fp, const char *prefix, size_t limit);
+uint32_t
+iov_net_csum_add(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t iov_off, size_t size);
--
1.7.7.6
- [Qemu-devel] [PATCH v4 0/9] VMXNET3 paravirtual NIC device implementation, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 3/9] Adding utility function iov_net_csum_add() for iovec checksum calculation,
Dmitry Fleytman <=
- [Qemu-devel] [PATCH v4 1/9] Adding missing flag VIRTIO_NET_HDR_F_DATA_VALID from Linux kernel source tre Reformatting comments according to checkpatch.pl requirements, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 7/9] Packet abstraction used by VMWARE network devices, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 4/9] MSI-X state save/load invocations moved to PCI Device save/load callbacks to avoid code duplication in MSI-X-enabled devices that support live migration, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 2/9] Adding utility function net_checksum_add_cont() that allows checksum calculation of scattered data with odd chunk sizes, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 5/9] Header with various utility functions shared by VMWARE SCSI and network devi, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 6/9] Various utility functions used by VMWARE network devices, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 8/9] VMXNET3 paravirtual device implementation, Dmitry Fleytman, 2012/03/15
- [Qemu-devel] [PATCH v4 9/9] VMXNET3 paravirtualized device integration. Interface type "vmxnet3" added., Dmitry Fleytman, 2012/03/15