macsec_hdr_len
return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
int len = skb->len - macsec_hdr_len(sci_present) -
aead_request_set_ad(req, macsec_hdr_len(sci_present));
int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));