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; }