net: iovec checksum calculator

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Yan Vugenfirer <yan@daynix.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/checksum.c b/net/checksum.c
index 4fa5563e7..14c08550e 100644
--- a/net/checksum.c
+++ b/net/checksum.c
@@ -15,6 +15,7 @@
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "qemu-common.h"
 #include "net/checksum.h"
 
 #define PROTO_TCP  6
@@ -84,3 +85,31 @@ void net_checksum_calculate(uint8_t *data, int length)
     data[14+hlen+csum_offset]   = csum >> 8;
     data[14+hlen+csum_offset+1] = csum & 0xff;
 }
+
+uint32_t
+net_checksum_add_iov(const struct iovec *iov, const unsigned int iov_cnt,
+                     uint32_t iov_off, uint32_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;
+}