static int rtl8139_can_receive(VLANClientState *nc) { RTL8139State *s = DO_UPCAST(NICState, nc, nc)->opaque; int avail; /* Receive (drop) packets if card is disabled. */ if (!s->clock_enabled) return 1; if (!rtl8139_receiver_enabled(s)) return 1; if (rtl8139_cp_receiver_enabled(s)) { /* ??? Flow control not implemented in c+ mode. This is a hack to work around slirp deficiencies anyway. */ return 1; } else { avail = MOD2(s->RxBufferSize + s->RxBufPtr - s->RxBufAddr, s->RxBufferSize); return (avail == 0 || avail >= 1514); } }