def _set_sa_valid(self, v, load=False):
    """
    Setter method for sa_valid, mapped from YANG variable /macsec/interfaces/interface/scsa_rx/scsa_rx/state/counters/sa_valid (oc-yang:counter64)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_sa_valid is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_sa_valid() directly.

    YANG Description: Secure Association Valid RX Packets counter.