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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>
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2 changed files with 41 additions and 0 deletions
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@ -15,6 +15,7 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h"
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#include "net/checksum.h"
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#define PROTO_TCP 6
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@ -84,3 +85,31 @@ void net_checksum_calculate(uint8_t *data, int length)
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data[14+hlen+csum_offset] = csum >> 8;
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data[14+hlen+csum_offset+1] = csum & 0xff;
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}
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uint32_t
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net_checksum_add_iov(const struct iovec *iov, const unsigned int iov_cnt,
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uint32_t iov_off, uint32_t size)
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{
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size_t iovec_off, buf_off;
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unsigned int i;
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uint32_t res = 0;
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uint32_t seq = 0;
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iovec_off = 0;
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buf_off = 0;
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for (i = 0; i < iov_cnt && size; i++) {
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if (iov_off < (iovec_off + iov[i].iov_len)) {
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size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
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void *chunk_buf = iov[i].iov_base + (iov_off - iovec_off);
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res += net_checksum_add_cont(len, chunk_buf, seq);
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seq += len;
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buf_off += len;
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iov_off += len;
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size -= len;
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}
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iovec_off += iov[i].iov_len;
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}
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return res;
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}
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