quoted

+	bdp->cbd_bufaddr = cpu_to_fec32(dma);
+	bdp->cbd_datlen = cpu_to_fec16(len);
+
+	if (fep->bufdesc_ex) {
+		struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
+
+		if (fep->quirks & FEC_QUIRK_HAS_AVB)
+			estatus |= FEC_TX_BD_FTYPE(txq->bd.qid);
+
+		ebdp->cbd_bdu = 0;
+		ebdp->cbd_esc = cpu_to_fec32(estatus);
+	}
+
+	status |= (BD_ENET_TX_READY | BD_ENET_TX_TC);
+	bdp->cbd_sc = cpu_to_fec16(status);
+	dma_wmb();

Is there a missing dma_wmb() before setting BD_ENET_TX_READY?

Yes, my bad, I will fix it.