+static struct prueth_fw_offsets fw_offsets_v2_1;
+
+static void icssm_prueth_set_fw_offsets(struct prueth *prueth)
+{
+	/* Set VLAN/Multicast filter control and table offsets */
+	if (PRUETH_IS_EMAC(prueth)) {
+		prueth->fw_offsets->mc_ctrl_byte  =
+			ICSS_EMAC_FW_MULTICAST_FILTER_CTRL_OFFSET;
+		prueth->fw_offsets->mc_filter_mask =
+			ICSS_EMAC_FW_MULTICAST_FILTER_MASK_OFFSET;
+		prueth->fw_offsets->mc_filter_tbl =
+			ICSS_EMAC_FW_MULTICAST_FILTER_TABLE;

I know for some of these SoCs, there can be multiple instances of the
hardware blocks. It looks like that will go wrong here, because there
is only one fw_offsets_v2_1 ?

Humm, actually, if this are constant, why have fw_offsets_v2_1? Just
use ICSS_EMAC_FW_MULTICAST_FILTER_CTRL_OFFSET directly?

+static void icssm_emac_mc_filter_ctrl(struct prueth_emac *emac, bool enable)
+{
+	struct prueth *prueth = emac->prueth;
+	void __iomem *mc_filter_ctrl;
+	void __iomem *ram;
+	u32 mc_ctrl_byte;
+	u32 reg;
+
+	ram = prueth->mem[emac->dram].va;
+	mc_ctrl_byte = prueth->fw_offsets->mc_ctrl_byte;
+	mc_filter_ctrl = ram + mc_ctrl_byte;

mc_filter_ctrl = ram + ICSS_EMAC_FW_MULTICAST_FILTER_CTRL_OFFSET; ???

+static void icssm_prueth_sw_fdb_work(struct work_struct *work)
+{
+	struct icssm_prueth_sw_fdb_work *fdb_work =
+		container_of(work, struct icssm_prueth_sw_fdb_work, work);
+	struct prueth_emac *emac = fdb_work->emac;
+
+	rtnl_lock();
+
+	/* Interface is not up */
+	if (!emac->prueth->fdb_tbl) {
+		rtnl_unlock();
+		goto free;
+	}

I would probably put the rtnl_unlock() after free: label.

+
+	switch (fdb_work->event) {
+	case FDB_LEARN:
+		icssm_prueth_sw_insert_fdb_entry(emac, fdb_work->addr, 0);
+		break;
+	case FDB_PURGE:
+		icssm_prueth_sw_do_purge_fdb(emac);
+		break;
+	default:
+		break;
+	}
+	rtnl_unlock();
+
+free:
+	kfree(fdb_work);
+	dev_put(emac->ndev);
+}

	Andrew