net: lan966x: Add FDMA functionality

Ethernet frames can be extracted or injected to or from the device's
DDR memory. There is one channel for injection and one channel for
extraction. Each of these channels contain a linked list of DCBs which
contains DB. The DCB contains only 1 DB for both the injection and
extraction. Each DB contains a frame. Every time when a frame is received
or transmitted an interrupt is generated.

It is not possible to use both the FDMA and the manual
injection/extraction of the frames. Therefore the FDMA has priority over
the manual because of better performance values.

FDMA:
iperf -c 192.168.1.1
[  5]   0.00-10.02  sec   420 MBytes   352 Mbits/sec    0 sender
[  5]   0.00-10.03  sec   420 MBytes   351 Mbits/sec      receiver

iperf -c 192.168.1.1 -R
[  5]   0.00-10.01  sec   528 MBytes   442 Mbits/sec    0 sender
[  5]   0.00-10.00  sec   524 MBytes   440 Mbits/sec      receiver

Manual:
iperf -c 192.168.1.1
[  5]   0.00-10.02  sec  93.8 MBytes  78.5 Mbits/sec    0 sender
[  5]   0.00-10.03  sec  93.8 MBytes  78.4 Mbits/sec      receiver

ipers -c 192.168.1.1 -R
[  5]   0.00-10.03  sec   121 MBytes   101 Mbits/sec    0 sender
[  5]   0.00-10.01  sec   118 MBytes  99.0 Mbits/sec      receiver

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 708 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 000000000000..f5fdb7455a41
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
@@ -0,0 +1,708 @@
+// 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;
+}
+
+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_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];
+	skb = build_skb(page_address(page), PAGE_SIZE << rx->page_order);
+	if (unlikely(!skb))
+		goto unmap_page;
+
+	dma_unmap_single(lan966x->dev, (dma_addr_t)db->dataptr,
+			 FDMA_DCB_STATUS_BLOCKL(db->status),
+			 DMA_FROM_DEVICE);
+	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);
+
+	WARN_ON(src_port >= lan966x->num_phys_ports);
+
+	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;
+
+unmap_page:
+	dma_unmap_page(lan966x->dev, (dma_addr_t)db->dataptr,
+		       FDMA_DCB_STATUS_BLOCKL(db->status),
+		       DMA_FROM_DEVICE);
+	__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;
+}
+
+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_POLL_WEIGHT);
+	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);
+}