_RND
((_RND(pxmitbuf->len, 8) + txlen) > max_xmit_len) ||
pxmitbuf->ptail += _RND(txlen, 8); /* round to 8 bytes alignment */
pxmitbuf->len = _RND(pxmitbuf->len, 8) + txlen;
cnt = _RND(cnt, psdio->block_transfer_len);
cnt = _RND(cnt, psdio->block_transfer_len);