From: Dmitry Fleytman <dmi...@daynix.com>
Signed-off-by: Dmitry Fleytman <dmi...@daynix.com>
Signed-off-by: Yan Vugenfirer <y...@daynix.com>
---
iov.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
iov.h | 6 ++++++
2 files changed, 59 insertions(+), 0 deletions(-)
diff --git a/iov.c b/iov.c
index 0f96493..0ac15a1 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)
@@ -65,6 +66,30 @@ size_t iov_to_buf(const struct iovec *iov, const unsigned
int iov_cnt,
return buf_off;
}
+size_t iov_rebuild(struct iovec *dst, unsigned int dst_cnt,
+ const struct iovec *src, const unsigned int src_cnt,
+ size_t src_off)
+{
+ size_t curr_src_off = 0;
+ unsigned int i, j = 0;
+
+ for (i = 0; i < src_cnt; i++) {
+ if (src_off < (curr_src_off + src[i].iov_len)) {
+ if (j == dst_cnt) {
+ return (size_t) -1;
+ }
+
+ dst[j].iov_len = curr_src_off + src[i].iov_len - src_off;
+ dst[j].iov_base = src[i].iov_base + (src_off - curr_src_off);
+
+ src_off += dst[j].iov_len;
+ j++;
+ }
+ curr_src_off += src[i].iov_len;
+ }
+ return j;
+}
+
size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt,
size_t iov_off, size_t size)
{
@@ -130,3 +155,31 @@ 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..b11cdd3 100644
--- a/iov.h
+++ b/iov.h
@@ -16,8 +16,14 @@ size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
const void *buf, size_t iov_off, size_t size);
size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
void *buf, size_t iov_off, size_t size);
+size_t iov_rebuild(struct iovec *dest, unsigned int dest_cnt,
+ const struct iovec *src, const unsigned int src_cnt,
+ size_t src_off);
size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
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
