Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 836 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
new file mode 100644
index 000000000..e6948939c
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
@@ -0,0 +1,836 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+static int lan966x_fdma_channel_active(struct lan966x *lan966x)
+{
+	return lan_rd(lan966x, FDMA_CH_ACTIVE);
+}
+
+static struct page *lan966x_fdma_rx_alloc_page(struct lan966x_rx *rx,
+					       struct lan966x_db *db)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	dma_addr_t dma_addr;
+	struct page *page;
+
+	page = dev_alloc_pages(rx->page_order);
+	if (unlikely(!page))
+		return NULL;
+
+	dma_addr = dma_map_page(lan966x->dev, page, 0,
+				PAGE_SIZE << rx->page_order,
+				DMA_FROM_DEVICE);
+	if (unlikely(dma_mapping_error(lan966x->dev, dma_addr)))
+		goto free_page;
+
+	db->dataptr = dma_addr;
+
+	return page;
+
+free_page:
+	__free_pages(page, rx->page_order);
+	return NULL;
+}
+
+static void lan966x_fdma_rx_free_pages(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	struct lan966x_rx_dcb *dcb;
+	struct lan966x_db *db;
+	int i, j;
+
+	for (i = 0; i < FDMA_DCB_MAX; ++i) {
+		dcb = &rx->dcbs[i];
+
+		for (j = 0; j < FDMA_RX_DCB_MAX_DBS; ++j) {
+			db = &dcb->db[j];
+			dma_unmap_single(lan966x->dev,
+					 (dma_addr_t)db->dataptr,
+					 PAGE_SIZE << rx->page_order,
+					 DMA_FROM_DEVICE);
+			__free_pages(rx->page[i][j], rx->page_order);
+		}
+	}
+}
+
+static void lan966x_fdma_rx_add_dcb(struct lan966x_rx *rx,
+				    struct lan966x_rx_dcb *dcb,
+				    u64 nextptr)
+{
+	struct lan966x_db *db;
+	int i;
+
+	for (i = 0; i < FDMA_RX_DCB_MAX_DBS; ++i) {
+		db = &dcb->db[i];
+		db->status = FDMA_DCB_STATUS_INTR;
+	}
+
+	dcb->nextptr = FDMA_DCB_INVALID_DATA;
+	dcb->info = FDMA_DCB_INFO_DATAL(PAGE_SIZE << rx->page_order);
+
+	rx->last_entry->nextptr = nextptr;
+	rx->last_entry = dcb;
+}
+
+static int lan966x_fdma_rx_alloc(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	struct lan966x_rx_dcb *dcb;
+	struct lan966x_db *db;
+	struct page *page;
+	int i, j;
+	int size;
+
+	/* calculate how many pages are needed to allocate the dcbs */
+	size = sizeof(struct lan966x_rx_dcb) * FDMA_DCB_MAX;
+	size = ALIGN(size, PAGE_SIZE);
+
+	rx->dcbs = dma_alloc_coherent(lan966x->dev, size, &rx->dma, GFP_KERNEL);
+	if (!rx->dcbs)
+		return -ENOMEM;
+
+	rx->last_entry = rx->dcbs;
+	rx->db_index = 0;
+	rx->dcb_index = 0;
+
+	/* Now for each dcb allocate the dbs */
+	for (i = 0; i < FDMA_DCB_MAX; ++i) {
+		dcb = &rx->dcbs[i];
+		dcb->info = 0;
+
+		/* For each db allocate a page and map it to the DB dataptr. */
+		for (j = 0; j < FDMA_RX_DCB_MAX_DBS; ++j) {
+			db = &dcb->db[j];
+			page = lan966x_fdma_rx_alloc_page(rx, db);
+			if (!page)
+				return -ENOMEM;
+
+			db->status = 0;
+			rx->page[i][j] = page;
+		}
+
+		lan966x_fdma_rx_add_dcb(rx, dcb, rx->dma + sizeof(*dcb) * i);
+	}
+
+	return 0;
+}
+
+static void lan966x_fdma_rx_free(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	u32 size;
+
+	/* Now it is possible to do the cleanup of dcb */
+	size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX;
+	size = ALIGN(size, PAGE_SIZE);
+	dma_free_coherent(lan966x->dev, size, rx->dcbs, rx->dma);
+}
+
+static void lan966x_fdma_rx_start(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	u32 mask;
+
+	/* When activating a channel, first is required to write the first DCB
+	 * address and then to activate it
+	 */
+	lan_wr(lower_32_bits((u64)rx->dma), lan966x,
+	       FDMA_DCB_LLP(rx->channel_id));
+	lan_wr(upper_32_bits((u64)rx->dma), lan966x,
+	       FDMA_DCB_LLP1(rx->channel_id));
+
+	lan_wr(FDMA_CH_CFG_CH_DCB_DB_CNT_SET(FDMA_RX_DCB_MAX_DBS) |
+	       FDMA_CH_CFG_CH_INTR_DB_EOF_ONLY_SET(1) |
+	       FDMA_CH_CFG_CH_INJ_PORT_SET(0) |
+	       FDMA_CH_CFG_CH_MEM_SET(1),
+	       lan966x, FDMA_CH_CFG(rx->channel_id));
+
+	/* Start fdma */
+	lan_rmw(FDMA_PORT_CTRL_XTR_STOP_SET(0),
+		FDMA_PORT_CTRL_XTR_STOP,
+		lan966x, FDMA_PORT_CTRL(0));
+
+	/* Enable interrupts */
+	mask = lan_rd(lan966x, FDMA_INTR_DB_ENA);
+	mask = FDMA_INTR_DB_ENA_INTR_DB_ENA_GET(mask);
+	mask |= BIT(rx->channel_id);
+	lan_rmw(FDMA_INTR_DB_ENA_INTR_DB_ENA_SET(mask),
+		FDMA_INTR_DB_ENA_INTR_DB_ENA,
+		lan966x, FDMA_INTR_DB_ENA);
+
+	/* Activate the channel */
+	lan_rmw(FDMA_CH_ACTIVATE_CH_ACTIVATE_SET(BIT(rx->channel_id)),
+		FDMA_CH_ACTIVATE_CH_ACTIVATE,
+		lan966x, FDMA_CH_ACTIVATE);
+}
+
+static void lan966x_fdma_rx_disable(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	u32 val;
+
+	/* Disable the channel */
+	lan_rmw(FDMA_CH_DISABLE_CH_DISABLE_SET(BIT(rx->channel_id)),
+		FDMA_CH_DISABLE_CH_DISABLE,
+		lan966x, FDMA_CH_DISABLE);
+
+	readx_poll_timeout_atomic(lan966x_fdma_channel_active, lan966x,
+				  val, !(val & BIT(rx->channel_id)),
+				  READL_SLEEP_US, READL_TIMEOUT_US);
+
+	lan_rmw(FDMA_CH_DB_DISCARD_DB_DISCARD_SET(BIT(rx->channel_id)),
+		FDMA_CH_DB_DISCARD_DB_DISCARD,
+		lan966x, FDMA_CH_DB_DISCARD);
+}
+
+static void lan966x_fdma_rx_reload(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+
+	lan_rmw(FDMA_CH_RELOAD_CH_RELOAD_SET(BIT(rx->channel_id)),
+		FDMA_CH_RELOAD_CH_RELOAD,
+		lan966x, FDMA_CH_RELOAD);
+}
+
+static void lan966x_fdma_tx_add_dcb(struct lan966x_tx *tx,
+				    struct lan966x_tx_dcb *dcb)
+{
+	dcb->nextptr = FDMA_DCB_INVALID_DATA;
+	dcb->info = 0;
+}
+
+static int lan966x_fdma_tx_alloc(struct lan966x_tx *tx)
+{
+	struct lan966x *lan966x = tx->lan966x;
+	struct lan966x_tx_dcb *dcb;
+	struct lan966x_db *db;
+	int size;
+	int i, j;
+
+	tx->dcbs_buf = kcalloc(FDMA_DCB_MAX, sizeof(struct lan966x_tx_dcb_buf),
+			       GFP_KERNEL);
+	if (!tx->dcbs_buf)
+		return -ENOMEM;
+
+	/* calculate how many pages are needed to allocate the dcbs */
+	size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX;
+	size = ALIGN(size, PAGE_SIZE);
+	tx->dcbs = dma_alloc_coherent(lan966x->dev, size, &tx->dma, GFP_KERNEL);
+	if (!tx->dcbs)
+		goto out;
+
+	/* Now for each dcb allocate the db */
+	for (i = 0; i < FDMA_DCB_MAX; ++i) {
+		dcb = &tx->dcbs[i];
+
+		for (j = 0; j < FDMA_TX_DCB_MAX_DBS; ++j) {
+			db = &dcb->db[j];
+			db->dataptr = 0;
+			db->status = 0;
+		}
+
+		lan966x_fdma_tx_add_dcb(tx, dcb);
+	}
+
+	return 0;
+
+out:
+	kfree(tx->dcbs_buf);
+	return -ENOMEM;
+}
+
+static void lan966x_fdma_tx_free(struct lan966x_tx *tx)
+{
+	struct lan966x *lan966x = tx->lan966x;
+	int size;
+
+	kfree(tx->dcbs_buf);
+
+	size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX;
+	size = ALIGN(size, PAGE_SIZE);
+	dma_free_coherent(lan966x->dev, size, tx->dcbs, tx->dma);
+}
+
+static void lan966x_fdma_tx_activate(struct lan966x_tx *tx)
+{
+	struct lan966x *lan966x = tx->lan966x;
+	u32 mask;
+
+	/* When activating a channel, first is required to write the first DCB
+	 * address and then to activate it
+	 */
+	lan_wr(lower_32_bits((u64)tx->dma), lan966x,
+	       FDMA_DCB_LLP(tx->channel_id));
+	lan_wr(upper_32_bits((u64)tx->dma), lan966x,
+	       FDMA_DCB_LLP1(tx->channel_id));
+
+	lan_wr(FDMA_CH_CFG_CH_DCB_DB_CNT_SET(FDMA_TX_DCB_MAX_DBS) |
+	       FDMA_CH_CFG_CH_INTR_DB_EOF_ONLY_SET(1) |
+	       FDMA_CH_CFG_CH_INJ_PORT_SET(0) |
+	       FDMA_CH_CFG_CH_MEM_SET(1),
+	       lan966x, FDMA_CH_CFG(tx->channel_id));
+
+	/* Start fdma */
+	lan_rmw(FDMA_PORT_CTRL_INJ_STOP_SET(0),
+		FDMA_PORT_CTRL_INJ_STOP,
+		lan966x, FDMA_PORT_CTRL(0));
+
+	/* Enable interrupts */
+	mask = lan_rd(lan966x, FDMA_INTR_DB_ENA);
+	mask = FDMA_INTR_DB_ENA_INTR_DB_ENA_GET(mask);
+	mask |= BIT(tx->channel_id);
+	lan_rmw(FDMA_INTR_DB_ENA_INTR_DB_ENA_SET(mask),
+		FDMA_INTR_DB_ENA_INTR_DB_ENA,
+		lan966x, FDMA_INTR_DB_ENA);
+
+	/* Activate the channel */
+	lan_rmw(FDMA_CH_ACTIVATE_CH_ACTIVATE_SET(BIT(tx->channel_id)),
+		FDMA_CH_ACTIVATE_CH_ACTIVATE,
+		lan966x, FDMA_CH_ACTIVATE);
+}
+
+static void lan966x_fdma_tx_disable(struct lan966x_tx *tx)
+{
+	struct lan966x *lan966x = tx->lan966x;
+	u32 val;
+
+	/* Disable the channel */
+	lan_rmw(FDMA_CH_DISABLE_CH_DISABLE_SET(BIT(tx->channel_id)),
+		FDMA_CH_DISABLE_CH_DISABLE,
+		lan966x, FDMA_CH_DISABLE);
+
+	readx_poll_timeout_atomic(lan966x_fdma_channel_active, lan966x,
+				  val, !(val & BIT(tx->channel_id)),
+				  READL_SLEEP_US, READL_TIMEOUT_US);
+
+	lan_rmw(FDMA_CH_DB_DISCARD_DB_DISCARD_SET(BIT(tx->channel_id)),
+		FDMA_CH_DB_DISCARD_DB_DISCARD,
+		lan966x, FDMA_CH_DB_DISCARD);
+
+	tx->activated = false;
+	tx->last_in_use = -1;
+}
+
+static void lan966x_fdma_tx_reload(struct lan966x_tx *tx)
+{
+	struct lan966x *lan966x = tx->lan966x;
+
+	/* Write the registers to reload the channel */
+	lan_rmw(FDMA_CH_RELOAD_CH_RELOAD_SET(BIT(tx->channel_id)),
+		FDMA_CH_RELOAD_CH_RELOAD,
+		lan966x, FDMA_CH_RELOAD);
+}
+
+static void lan966x_fdma_wakeup_netdev(struct lan966x *lan966x)
+{
+	struct lan966x_port *port;
+	int i;
+
+	for (i = 0; i < lan966x->num_phys_ports; ++i) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		if (netif_queue_stopped(port->dev))
+			netif_wake_queue(port->dev);
+	}
+}
+
+static void lan966x_fdma_stop_netdev(struct lan966x *lan966x)
+{
+	struct lan966x_port *port;
+	int i;
+
+	for (i = 0; i < lan966x->num_phys_ports; ++i) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		netif_stop_queue(port->dev);
+	}
+}
+
+static void lan966x_fdma_tx_clear_buf(struct lan966x *lan966x, int weight)
+{
+	struct lan966x_tx *tx = &lan966x->tx;
+	struct lan966x_tx_dcb_buf *dcb_buf;
+	struct lan966x_db *db;
+	unsigned long flags;
+	bool clear = false;
+	int i;
+
+	spin_lock_irqsave(&lan966x->tx_lock, flags);
+	for (i = 0; i < FDMA_DCB_MAX; ++i) {
+		dcb_buf = &tx->dcbs_buf[i];
+
+		if (!dcb_buf->used)
+			continue;
+
+		db = &tx->dcbs[i].db[0];
+		if (!(db->status & FDMA_DCB_STATUS_DONE))
+			continue;
+
+		dcb_buf->dev->stats.tx_packets++;
+		dcb_buf->dev->stats.tx_bytes += dcb_buf->skb->len;
+
+		dcb_buf->used = false;
+		dma_unmap_single(lan966x->dev,
+				 dcb_buf->dma_addr,
+				 dcb_buf->skb->len,
+				 DMA_TO_DEVICE);
+		if (!dcb_buf->ptp)
+			dev_kfree_skb_any(dcb_buf->skb);
+
+		clear = true;
+	}
+
+	if (clear)
+		lan966x_fdma_wakeup_netdev(lan966x);
+
+	spin_unlock_irqrestore(&lan966x->tx_lock, flags);
+}
+
+static bool lan966x_fdma_rx_more_frames(struct lan966x_rx *rx)
+{
+	struct lan966x_db *db;
+
+	/* Check if there is any data */
+	db = &rx->dcbs[rx->dcb_index].db[rx->db_index];
+	if (unlikely(!(db->status & FDMA_DCB_STATUS_DONE)))
+		return false;
+
+	return true;
+}
+
+static struct sk_buff *lan966x_fdma_rx_get_frame(struct lan966x_rx *rx)
+{
+	struct lan966x *lan966x = rx->lan966x;
+	u64 src_port, timestamp;
+	struct lan966x_db *db;
+	struct sk_buff *skb;
+	struct page *page;
+
+	/* Get the received frame and unmap it */
+	db = &rx->dcbs[rx->dcb_index].db[rx->db_index];
+	page = rx->page[rx->dcb_index][rx->db_index];
+
+	dma_sync_single_for_cpu(lan966x->dev, (dma_addr_t)db->dataptr,
+				FDMA_DCB_STATUS_BLOCKL(db->status),
+				DMA_FROM_DEVICE);
+
+	skb = build_skb(page_address(page), PAGE_SIZE << rx->page_order);
+	if (unlikely(!skb))
+		goto unmap_page;
+
+	skb_put(skb, FDMA_DCB_STATUS_BLOCKL(db->status));
+
+	lan966x_ifh_get_src_port(skb->data, &src_port);
+	lan966x_ifh_get_timestamp(skb->data, &timestamp);
+
+	if (WARN_ON(src_port >= lan966x->num_phys_ports))
+		goto free_skb;
+
+	dma_unmap_single_attrs(lan966x->dev, (dma_addr_t)db->dataptr,
+			       PAGE_SIZE << rx->page_order, DMA_FROM_DEVICE,
+			       DMA_ATTR_SKIP_CPU_SYNC);
+
+	skb->dev = lan966x->ports[src_port]->dev;
+	skb_pull(skb, IFH_LEN * sizeof(u32));
+
+	if (likely(!(skb->dev->features & NETIF_F_RXFCS)))
+		skb_trim(skb, skb->len - ETH_FCS_LEN);
+
+	lan966x_ptp_rxtstamp(lan966x, skb, timestamp);
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	if (lan966x->bridge_mask & BIT(src_port)) {
+		skb->offload_fwd_mark = 1;
+
+		skb_reset_network_header(skb);
+		if (!lan966x_hw_offload(lan966x, src_port, skb))
+			skb->offload_fwd_mark = 0;
+	}
+
+	skb->dev->stats.rx_bytes += skb->len;
+	skb->dev->stats.rx_packets++;
+
+	return skb;
+
+free_skb:
+	kfree_skb(skb);
+unmap_page:
+	dma_unmap_single_attrs(lan966x->dev, (dma_addr_t)db->dataptr,
+			       PAGE_SIZE << rx->page_order, DMA_FROM_DEVICE,
+			       DMA_ATTR_SKIP_CPU_SYNC);
+	__free_pages(page, rx->page_order);
+
+	return NULL;
+}
+
+static int lan966x_fdma_napi_poll(struct napi_struct *napi, int weight)
+{
+	struct lan966x *lan966x = container_of(napi, struct lan966x, napi);
+	struct lan966x_rx *rx = &lan966x->rx;
+	int dcb_reload = rx->dcb_index;
+	struct lan966x_rx_dcb *old_dcb;
+	struct lan966x_db *db;
+	struct sk_buff *skb;
+	struct page *page;
+	int counter = 0;
+	u64 nextptr;
+
+	lan966x_fdma_tx_clear_buf(lan966x, weight);
+
+	/* Get all received skb */
+	while (counter < weight) {
+		if (!lan966x_fdma_rx_more_frames(rx))
+			break;
+
+		skb = lan966x_fdma_rx_get_frame(rx);
+
+		rx->page[rx->dcb_index][rx->db_index] = NULL;
+		rx->dcb_index++;
+		rx->dcb_index &= FDMA_DCB_MAX - 1;
+
+		if (!skb)
+			break;
+
+		napi_gro_receive(&lan966x->napi, skb);
+		counter++;
+	}
+
+	/* Allocate new pages and map them */
+	while (dcb_reload != rx->dcb_index) {
+		db = &rx->dcbs[dcb_reload].db[rx->db_index];
+		page = lan966x_fdma_rx_alloc_page(rx, db);
+		if (unlikely(!page))
+			break;
+		rx->page[dcb_reload][rx->db_index] = page;
+
+		old_dcb = &rx->dcbs[dcb_reload];
+		dcb_reload++;
+		dcb_reload &= FDMA_DCB_MAX - 1;
+
+		nextptr = rx->dma + ((unsigned long)old_dcb -
+				     (unsigned long)rx->dcbs);
+		lan966x_fdma_rx_add_dcb(rx, old_dcb, nextptr);
+		lan966x_fdma_rx_reload(rx);
+	}
+
+	if (counter < weight && napi_complete_done(napi, counter))
+		lan_wr(0xff, lan966x, FDMA_INTR_DB_ENA);
+
+	return counter;
+}
+
+irqreturn_t lan966x_fdma_irq_handler(int irq, void *args)
+{
+	struct lan966x *lan966x = args;
+	u32 db, err, err_type;
+
+	db = lan_rd(lan966x, FDMA_INTR_DB);
+	err = lan_rd(lan966x, FDMA_INTR_ERR);
+
+	if (db) {
+		lan_wr(0, lan966x, FDMA_INTR_DB_ENA);
+		lan_wr(db, lan966x, FDMA_INTR_DB);
+
+		napi_schedule(&lan966x->napi);
+	}
+
+	if (err) {
+		err_type = lan_rd(lan966x, FDMA_ERRORS);
+
+		WARN(1, "Unexpected error: %d, error_type: %d\n", err, err_type);
+
+		lan_wr(err, lan966x, FDMA_INTR_ERR);
+		lan_wr(err_type, lan966x, FDMA_ERRORS);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int lan966x_fdma_get_next_dcb(struct lan966x_tx *tx)
+{
+	struct lan966x_tx_dcb_buf *dcb_buf;
+	int i;
+
+	for (i = 0; i < FDMA_DCB_MAX; ++i) {
+		dcb_buf = &tx->dcbs_buf[i];
+		if (!dcb_buf->used && i != tx->last_in_use)
+			return i;
+	}
+
+	return -1;
+}
+
+int lan966x_fdma_xmit(struct sk_buff *skb, __be32 *ifh, struct net_device *dev)
+{
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	struct lan966x_tx_dcb_buf *next_dcb_buf;
+	struct lan966x_tx_dcb *next_dcb, *dcb;
+	struct lan966x_tx *tx = &lan966x->tx;
+	struct lan966x_db *next_db;
+	int needed_headroom;
+	int needed_tailroom;
+	dma_addr_t dma_addr;
+	int next_to_use;
+	int err;
+
+	/* Get next index */
+	next_to_use = lan966x_fdma_get_next_dcb(tx);
+	if (next_to_use < 0) {
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (skb_put_padto(skb, ETH_ZLEN)) {
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	/* skb processing */
+	needed_headroom = max_t(int, IFH_LEN * sizeof(u32) - skb_headroom(skb), 0);
+	needed_tailroom = max_t(int, ETH_FCS_LEN - skb_tailroom(skb), 0);
+	if (needed_headroom || needed_tailroom || skb_header_cloned(skb)) {
+		err = pskb_expand_head(skb, needed_headroom, needed_tailroom,
+				       GFP_ATOMIC);
+		if (unlikely(err)) {
+			dev->stats.tx_dropped++;
+			err = NETDEV_TX_OK;
+			goto release;
+		}
+	}
+
+	skb_tx_timestamp(skb);
+	skb_push(skb, IFH_LEN * sizeof(u32));
+	memcpy(skb->data, ifh, IFH_LEN * sizeof(u32));
+	skb_put(skb, 4);
+
+	dma_addr = dma_map_single(lan966x->dev, skb->data, skb->len,
+				  DMA_TO_DEVICE);
+	if (dma_mapping_error(lan966x->dev, dma_addr)) {
+		dev->stats.tx_dropped++;
+		err = NETDEV_TX_OK;
+		goto release;
+	}
+
+	/* Setup next dcb */
+	next_dcb = &tx->dcbs[next_to_use];
+	next_dcb->nextptr = FDMA_DCB_INVALID_DATA;
+
+	next_db = &next_dcb->db[0];
+	next_db->dataptr = dma_addr;
+	next_db->status = FDMA_DCB_STATUS_SOF |
+			  FDMA_DCB_STATUS_EOF |
+			  FDMA_DCB_STATUS_INTR |
+			  FDMA_DCB_STATUS_BLOCKO(0) |
+			  FDMA_DCB_STATUS_BLOCKL(skb->len);
+
+	/* Fill up the buffer */
+	next_dcb_buf = &tx->dcbs_buf[next_to_use];
+	next_dcb_buf->skb = skb;
+	next_dcb_buf->dma_addr = dma_addr;
+	next_dcb_buf->used = true;
+	next_dcb_buf->ptp = false;
+	next_dcb_buf->dev = dev;
+
+	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
+	    LAN966X_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
+		next_dcb_buf->ptp = true;
+
+	if (likely(lan966x->tx.activated)) {
+		/* Connect current dcb to the next db */
+		dcb = &tx->dcbs[tx->last_in_use];
+		dcb->nextptr = tx->dma + (next_to_use *
+					  sizeof(struct lan966x_tx_dcb));
+
+		lan966x_fdma_tx_reload(tx);
+	} else {
+		/* Because it is first time, then just activate */
+		lan966x->tx.activated = true;
+		lan966x_fdma_tx_activate(tx);
+	}
+
+	/* Move to next dcb because this last in use */
+	tx->last_in_use = next_to_use;
+
+	return NETDEV_TX_OK;
+
+release:
+	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
+	    LAN966X_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
+		lan966x_ptp_txtstamp_release(port, skb);
+
+	dev_kfree_skb_any(skb);
+	return err;
+}
+
+static int lan966x_fdma_get_max_mtu(struct lan966x *lan966x)
+{
+	int max_mtu = 0;
+	int i;
+
+	for (i = 0; i < lan966x->num_phys_ports; ++i) {
+		struct lan966x_port *port;
+		int mtu;
+
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		mtu = lan_rd(lan966x, DEV_MAC_MAXLEN_CFG(port->chip_port));
+		if (mtu > max_mtu)
+			max_mtu = mtu;
+	}
+
+	return max_mtu;
+}
+
+static int lan966x_qsys_sw_status(struct lan966x *lan966x)
+{
+	return lan_rd(lan966x, QSYS_SW_STATUS(CPU_PORT));
+}
+
+static int lan966x_fdma_reload(struct lan966x *lan966x, int new_mtu)
+{
+	dma_addr_t rx_dma;
+	void *rx_dcbs;
+	u32 size;
+	int err;
+
+	/* Store these for later to free them */
+	rx_dma = lan966x->rx.dma;
+	rx_dcbs = lan966x->rx.dcbs;
+
+	napi_synchronize(&lan966x->napi);
+	napi_disable(&lan966x->napi);
+	lan966x_fdma_stop_netdev(lan966x);
+
+	lan966x_fdma_rx_disable(&lan966x->rx);
+	lan966x_fdma_rx_free_pages(&lan966x->rx);
+	lan966x->rx.page_order = round_up(new_mtu, PAGE_SIZE) / PAGE_SIZE - 1;
+	err = lan966x_fdma_rx_alloc(&lan966x->rx);
+	if (err)
+		goto restore;
+	lan966x_fdma_rx_start(&lan966x->rx);
+
+	size = sizeof(struct lan966x_rx_dcb) * FDMA_DCB_MAX;
+	size = ALIGN(size, PAGE_SIZE);
+	dma_free_coherent(lan966x->dev, size, rx_dcbs, rx_dma);
+
+	lan966x_fdma_wakeup_netdev(lan966x);
+	napi_enable(&lan966x->napi);
+
+	return err;
+restore:
+	lan966x->rx.dma = rx_dma;
+	lan966x->rx.dcbs = rx_dcbs;
+	lan966x_fdma_rx_start(&lan966x->rx);
+
+	return err;
+}
+
+int lan966x_fdma_change_mtu(struct lan966x *lan966x)
+{
+	int max_mtu;
+	int err;
+	u32 val;
+
+	max_mtu = lan966x_fdma_get_max_mtu(lan966x);
+	max_mtu += IFH_LEN * sizeof(u32);
+	max_mtu += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+	max_mtu += VLAN_HLEN * 2;
+
+	if (round_up(max_mtu, PAGE_SIZE) / PAGE_SIZE - 1 ==
+	    lan966x->rx.page_order)
+		return 0;
+
+	/* Disable the CPU port */
+	lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(0),
+		QSYS_SW_PORT_MODE_PORT_ENA,
+		lan966x, QSYS_SW_PORT_MODE(CPU_PORT));
+
+	/* Flush the CPU queues */
+	readx_poll_timeout(lan966x_qsys_sw_status, lan966x,
+			   val, !(QSYS_SW_STATUS_EQ_AVAIL_GET(val)),
+			   READL_SLEEP_US, READL_TIMEOUT_US);
+
+	/* Add a sleep in case there are frames between the queues and the CPU
+	 * port
+	 */
+	usleep_range(1000, 2000);
+
+	err = lan966x_fdma_reload(lan966x, max_mtu);
+
+	/* Enable back the CPU port */
+	lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(1),
+		QSYS_SW_PORT_MODE_PORT_ENA,
+		lan966x,  QSYS_SW_PORT_MODE(CPU_PORT));
+
+	return err;
+}
+
+void lan966x_fdma_netdev_init(struct lan966x *lan966x, struct net_device *dev)
+{
+	if (lan966x->fdma_ndev)
+		return;
+
+	lan966x->fdma_ndev = dev;
+	netif_napi_add(dev, &lan966x->napi, lan966x_fdma_napi_poll);
+	napi_enable(&lan966x->napi);
+}
+
+void lan966x_fdma_netdev_deinit(struct lan966x *lan966x, struct net_device *dev)
+{
+	if (lan966x->fdma_ndev == dev) {
+		netif_napi_del(&lan966x->napi);
+		lan966x->fdma_ndev = NULL;
+	}
+}
+
+int lan966x_fdma_init(struct lan966x *lan966x)
+{
+	int err;
+
+	if (!lan966x->fdma)
+		return 0;
+
+	lan966x->rx.lan966x = lan966x;
+	lan966x->rx.channel_id = FDMA_XTR_CHANNEL;
+	lan966x->tx.lan966x = lan966x;
+	lan966x->tx.channel_id = FDMA_INJ_CHANNEL;
+	lan966x->tx.last_in_use = -1;
+
+	err = lan966x_fdma_rx_alloc(&lan966x->rx);
+	if (err)
+		return err;
+
+	err = lan966x_fdma_tx_alloc(&lan966x->tx);
+	if (err) {
+		lan966x_fdma_rx_free(&lan966x->rx);
+		return err;
+	}
+
+	lan966x_fdma_rx_start(&lan966x->rx);
+
+	return 0;
+}
+
+void lan966x_fdma_deinit(struct lan966x *lan966x)
+{
+	if (!lan966x->fdma)
+		return;
+
+	lan966x_fdma_rx_disable(&lan966x->rx);
+	lan966x_fdma_tx_disable(&lan966x->tx);
+
+	napi_synchronize(&lan966x->napi);
+	napi_disable(&lan966x->napi);
+
+	lan966x_fdma_rx_free_pages(&lan966x->rx);
+	lan966x_fdma_rx_free(&lan966x->rx);
+	lan966x_fdma_tx_free(&lan966x->tx);
+}