--- /dev/null
+// 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, ×tamp);
+
+ 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);
+}
projects / platform / kernel / linux-rpi.git / commitdiff