1 files changed, 324 insertions, 73 deletions
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 23e1a94b9ce4..5528b0af82ae 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -89,6 +89,11 @@ static const u16 fec_enet_vlan_pri_to_queue[8] = {0, 0, 1, 1, 1, 2, 2, 2};
 #define FEC_ENET_OPD_V	0xFFF0
 #define FEC_MDIO_PM_TIMEOUT  100 /* ms */
 
+#define FEC_ENET_XDP_PASS          0
+#define FEC_ENET_XDP_CONSUMED      BIT(0)
+#define FEC_ENET_XDP_TX            BIT(1)
+#define FEC_ENET_XDP_REDIR         BIT(2)
+
 struct fec_devinfo {
 	u32 quirks;
 };
@@ -365,16 +370,6 @@ static void swap_buffer(void *bufaddr, int len)
 		swab32s(buf);
 }
 
-static void swap_buffer2(void *dst_buf, void *src_buf, int len)
-{
-	int i;
-	unsigned int *src = src_buf;
-	unsigned int *dst = dst_buf;
-
-	for (i = 0; i < len; i += 4, src++, dst++)
-		*dst = swab32p(src);
-}
-
 static void fec_dump(struct net_device *ndev)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
@@ -428,13 +423,14 @@ static int
 fec_enet_create_page_pool(struct fec_enet_private *fep,
 			  struct fec_enet_priv_rx_q *rxq, int size)
 {
+	struct bpf_prog *xdp_prog = READ_ONCE(fep->xdp_prog);
 	struct page_pool_params pp_params = {
 		.order = 0,
 		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
 		.pool_size = size,
 		.nid = dev_to_node(&fep->pdev->dev),
 		.dev = &fep->pdev->dev,
-		.dma_dir = DMA_FROM_DEVICE,
+		.dma_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE,
 		.offset = FEC_ENET_XDP_HEADROOM,
 		.max_len = FEC_ENET_RX_FRSIZE,
 	};
@@ -1494,53 +1490,6 @@ static void fec_enet_tx(struct net_device *ndev)
 		fec_enet_tx_queue(ndev, i);
 }
 
-static int __maybe_unused
-fec_enet_new_rxbdp(struct net_device *ndev, struct bufdesc *bdp, struct sk_buff *skb)
-{
-	struct  fec_enet_private *fep = netdev_priv(ndev);
-	int off;
-
-	off = ((unsigned long)skb->data) & fep->rx_align;
-	if (off)
-		skb_reserve(skb, fep->rx_align + 1 - off);
-
-	bdp->cbd_bufaddr = cpu_to_fec32(dma_map_single(&fep->pdev->dev, skb->data, FEC_ENET_RX_FRSIZE - fep->rx_align, DMA_FROM_DEVICE));
-	if (dma_mapping_error(&fep->pdev->dev, fec32_to_cpu(bdp->cbd_bufaddr))) {
-		if (net_ratelimit())
-			netdev_err(ndev, "Rx DMA memory map failed\n");
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static bool __maybe_unused
-fec_enet_copybreak(struct net_device *ndev, struct sk_buff **skb,
-		   struct bufdesc *bdp, u32 length, bool swap)
-{
-	struct  fec_enet_private *fep = netdev_priv(ndev);
-	struct sk_buff *new_skb;
-
-	if (length > fep->rx_copybreak)
-		return false;
-
-	new_skb = netdev_alloc_skb(ndev, length);
-	if (!new_skb)
-		return false;
-
-	dma_sync_single_for_cpu(&fep->pdev->dev,
-				fec32_to_cpu(bdp->cbd_bufaddr),
-				FEC_ENET_RX_FRSIZE - fep->rx_align,
-				DMA_FROM_DEVICE);
-	if (!swap)
-		memcpy(new_skb->data, (*skb)->data, length);
-	else
-		swap_buffer2(new_skb->data, (*skb)->data, length);
-	*skb = new_skb;
-
-	return true;
-}
-
 static void fec_enet_update_cbd(struct fec_enet_priv_rx_q *rxq,
 				struct bufdesc *bdp, int index)
 {
@@ -1556,6 +1505,62 @@ static void fec_enet_update_cbd(struct fec_enet_priv_rx_q *rxq,
 	bdp->cbd_bufaddr = cpu_to_fec32(phys_addr);
 }
 
+static u32
+fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,
+		 struct xdp_buff *xdp, struct fec_enet_priv_rx_q *rxq, int index)
+{
+	unsigned int sync, len = xdp->data_end - xdp->data;
+	u32 ret = FEC_ENET_XDP_PASS;
+	struct page *page;
+	int err;
+	u32 act;
+
+	act = bpf_prog_run_xdp(prog, xdp);
+
+	/* Due xdp_adjust_tail: DMA sync for_device cover max len CPU touch */
+	sync = xdp->data_end - xdp->data_hard_start - FEC_ENET_XDP_HEADROOM;
+	sync = max(sync, len);
+
+	switch (act) {
+	case XDP_PASS:
+		rxq->stats[RX_XDP_PASS]++;
+		ret = FEC_ENET_XDP_PASS;
+		break;
+
+	case XDP_REDIRECT:
+		rxq->stats[RX_XDP_REDIRECT]++;
+		err = xdp_do_redirect(fep->netdev, xdp, prog);
+		if (!err) {
+			ret = FEC_ENET_XDP_REDIR;
+		} else {
+			ret = FEC_ENET_XDP_CONSUMED;
+			page = virt_to_head_page(xdp->data);
+			page_pool_put_page(rxq->page_pool, page, sync, true);
+		}
+		break;
+
+	default:
+		bpf_warn_invalid_xdp_action(fep->netdev, prog, act);
+		fallthrough;
+
+	case XDP_TX:
+		bpf_warn_invalid_xdp_action(fep->netdev, prog, act);
+		fallthrough;
+
+	case XDP_ABORTED:
+		fallthrough;    /* handle aborts by dropping packet */
+
+	case XDP_DROP:
+		rxq->stats[RX_XDP_DROP]++;
+		ret = FEC_ENET_XDP_CONSUMED;
+		page = virt_to_head_page(xdp->data);
+		page_pool_put_page(rxq->page_pool, page, sync, true);
+		break;
+	}
+
+	return ret;
+}
+
 /* During a receive, the bd_rx.cur points to the current incoming buffer.
  * When we update through the ring, if the next incoming buffer has
  * not been given to the system, we just set the empty indicator,
@@ -1577,7 +1582,22 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
 	u16	vlan_tag;
 	int	index = 0;
 	bool	need_swap = fep->quirks & FEC_QUIRK_SWAP_FRAME;
+	struct bpf_prog *xdp_prog = READ_ONCE(fep->xdp_prog);
+	u32 ret, xdp_result = FEC_ENET_XDP_PASS;
+	u32 data_start = FEC_ENET_XDP_HEADROOM;
+	struct xdp_buff xdp;
 	struct page *page;
+	u32 sub_len = 4;
+
+#if !defined(CONFIG_M5272)
+	/*If it has the FEC_QUIRK_HAS_RACC quirk property, the bit of
+	 * FEC_RACC_SHIFT16 is set by default in the probe function.
+	 */
+	if (fep->quirks & FEC_QUIRK_HAS_RACC) {
+		data_start += 2;
+		sub_len += 2;
+	}
+#endif
 
 #ifdef CONFIG_M532x
 	flush_cache_all();
@@ -1588,6 +1608,7 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
 	 * These get messed up if we get called due to a busy condition.
 	 */
 	bdp = rxq->bd.cur;
+	xdp_init_buff(&xdp, PAGE_SIZE, &rxq->xdp_rxq);
 
 	while (!((status = fec16_to_cpu(bdp->cbd_sc)) & BD_ENET_RX_EMPTY)) {
 
@@ -1637,23 +1658,31 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
 		prefetch(page_address(page));
 		fec_enet_update_cbd(rxq, bdp, index);
 
+		if (xdp_prog) {
+			xdp_buff_clear_frags_flag(&xdp);
+			/* subtract 16bit shift and FCS */
+			xdp_prepare_buff(&xdp, page_address(page),
+					 data_start, pkt_len - sub_len, false);
+			ret = fec_enet_run_xdp(fep, xdp_prog, &xdp, rxq, index);
+			xdp_result |= ret;
+			if (ret != FEC_ENET_XDP_PASS)
+				goto rx_processing_done;
+		}
+
 		/* The packet length includes FCS, but we don't want to
 		 * include that when passing upstream as it messes up
 		 * bridging applications.
 		 */
 		skb = build_skb(page_address(page), PAGE_SIZE);
-		skb_reserve(skb, FEC_ENET_XDP_HEADROOM);
-		skb_put(skb, pkt_len - 4);
+		skb_reserve(skb, data_start);
+		skb_put(skb, pkt_len - sub_len);
 		skb_mark_for_recycle(skb);
-		data = skb->data;
 
-		if (need_swap)
+		if (unlikely(need_swap)) {
+			data = page_address(page) + FEC_ENET_XDP_HEADROOM;
 			swap_buffer(data, pkt_len);
-
-#if !defined(CONFIG_M5272)
-		if (fep->quirks & FEC_QUIRK_HAS_RACC)
-			data = skb_pull_inline(skb, 2);
-#endif
+		}
+		data = skb->data;
 
 		/* Extract the enhanced buffer descriptor */
 		ebdp = NULL;
@@ -1732,6 +1761,10 @@ rx_processing_done:
 		writel(0, rxq->bd.reg_desc_active);
 	}
 	rxq->bd.cur = bdp;
+
+	if (xdp_result & FEC_ENET_XDP_REDIR)
+		xdp_do_flush_map();
+
 	return pkt_received;
 }
 
@@ -2226,7 +2259,7 @@ static int fec_enet_mii_probe(struct net_device *ndev)
 	fep->link = 0;
 	fep->full_duplex = 0;
 
-	phy_dev->mac_managed_pm = 1;
+	phy_dev->mac_managed_pm = true;
 
 	phy_attached_info(phy_dev);
 
@@ -2671,6 +2704,16 @@ static const struct fec_stat {
 
 #define FEC_STATS_SIZE		(ARRAY_SIZE(fec_stats) * sizeof(u64))
 
+static const char *fec_xdp_stat_strs[XDP_STATS_TOTAL] = {
+	"rx_xdp_redirect",           /* RX_XDP_REDIRECT = 0, */
+	"rx_xdp_pass",               /* RX_XDP_PASS, */
+	"rx_xdp_drop",               /* RX_XDP_DROP, */
+	"rx_xdp_tx",                 /* RX_XDP_TX, */
+	"rx_xdp_tx_errors",          /* RX_XDP_TX_ERRORS, */
+	"tx_xdp_xmit",               /* TX_XDP_XMIT, */
+	"tx_xdp_xmit_errors",        /* TX_XDP_XMIT_ERRORS, */
+};
+
 static void fec_enet_update_ethtool_stats(struct net_device *dev)
 {
 	struct fec_enet_private *fep = netdev_priv(dev);
@@ -2680,6 +2723,40 @@ static void fec_enet_update_ethtool_stats(struct net_device *dev)
 		fep->ethtool_stats[i] = readl(fep->hwp + fec_stats[i].offset);
 }
 
+static void fec_enet_get_xdp_stats(struct fec_enet_private *fep, u64 *data)
+{
+	u64 xdp_stats[XDP_STATS_TOTAL] = { 0 };
+	struct fec_enet_priv_rx_q *rxq;
+	int i, j;
+
+	for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+		rxq = fep->rx_queue[i];
+
+		for (j = 0; j < XDP_STATS_TOTAL; j++)
+			xdp_stats[j] += rxq->stats[j];
+	}
+
+	memcpy(data, xdp_stats, sizeof(xdp_stats));
+}
+
+static void fec_enet_page_pool_stats(struct fec_enet_private *fep, u64 *data)
+{
+	struct page_pool_stats stats = {};
+	struct fec_enet_priv_rx_q *rxq;
+	int i;
+
+	for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+		rxq = fep->rx_queue[i];
+
+		if (!rxq->page_pool)
+			continue;
+
+		page_pool_get_stats(rxq->page_pool, &stats);
+	}
+
+	page_pool_ethtool_stats_get(data, &stats);
+}
+
 static void fec_enet_get_ethtool_stats(struct net_device *dev,
 				       struct ethtool_stats *stats, u64 *data)
 {
@@ -2689,6 +2766,12 @@ static void fec_enet_get_ethtool_stats(struct net_device *dev,
 		fec_enet_update_ethtool_stats(dev);
 
 	memcpy(data, fep->ethtool_stats, FEC_STATS_SIZE);
+	data += FEC_STATS_SIZE / sizeof(u64);
+
+	fec_enet_get_xdp_stats(fep, data);
+	data += XDP_STATS_TOTAL;
+
+	fec_enet_page_pool_stats(fep, data);
 }
 
 static void fec_enet_get_strings(struct net_device *netdev,
@@ -2697,9 +2780,16 @@ static void fec_enet_get_strings(struct net_device *netdev,
 	int i;
 	switch (stringset) {
 	case ETH_SS_STATS:
-		for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
-			memcpy(data + i * ETH_GSTRING_LEN,
-				fec_stats[i].name, ETH_GSTRING_LEN);
+		for (i = 0; i < ARRAY_SIZE(fec_stats); i++) {
+			memcpy(data, fec_stats[i].name, ETH_GSTRING_LEN);
+			data += ETH_GSTRING_LEN;
+		}
+		for (i = 0; i < ARRAY_SIZE(fec_xdp_stat_strs); i++) {
+			strncpy(data, fec_xdp_stat_strs[i], ETH_GSTRING_LEN);
+			data += ETH_GSTRING_LEN;
+		}
+		page_pool_ethtool_stats_get_strings(data);
+
 		break;
 	case ETH_SS_TEST:
 		net_selftest_get_strings(data);
@@ -2709,9 +2799,14 @@ static void fec_enet_get_strings(struct net_device *netdev,
 
 static int fec_enet_get_sset_count(struct net_device *dev, int sset)
 {
+	int count;
+
 	switch (sset) {
 	case ETH_SS_STATS:
-		return ARRAY_SIZE(fec_stats);
+		count = ARRAY_SIZE(fec_stats) + XDP_STATS_TOTAL;
+		count += page_pool_ethtool_stats_get_count();
+		return count;
+
 	case ETH_SS_TEST:
 		return net_selftest_get_count();
 	default:
@@ -2722,7 +2817,8 @@ static int fec_enet_get_sset_count(struct net_device *dev, int sset)
 static void fec_enet_clear_ethtool_stats(struct net_device *dev)
 {
 	struct fec_enet_private *fep = netdev_priv(dev);
-	int i;
+	struct fec_enet_priv_rx_q *rxq;
+	int i, j;
 
 	/* Disable MIB statistics counters */
 	writel(FEC_MIB_CTRLSTAT_DISABLE, fep->hwp + FEC_MIB_CTRLSTAT);
@@ -2730,6 +2826,12 @@ static void fec_enet_clear_ethtool_stats(struct net_device *dev)
 	for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
 		writel(0, fep->hwp + fec_stats[i].offset);
 
+	for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+		rxq = fep->rx_queue[i];
+		for (j = 0; j < XDP_STATS_TOTAL; j++)
+			rxq->stats[j] = 0;
+	}
+
 	/* Don't disable MIB statistics counters */
 	writel(0, fep->hwp + FEC_MIB_CTRLSTAT);
 }
@@ -3083,6 +3185,9 @@ static void fec_enet_free_buffers(struct net_device *ndev)
 		for (i = 0; i < rxq->bd.ring_size; i++)
 			page_pool_release_page(rxq->page_pool, rxq->rx_skb_info[i].page);
 
+		for (i = 0; i < XDP_STATS_TOTAL; i++)
+			rxq->stats[i] = 0;
+
 		if (xdp_rxq_info_is_reg(&rxq->xdp_rxq))
 			xdp_rxq_info_unreg(&rxq->xdp_rxq);
 		page_pool_destroy(rxq->page_pool);
@@ -3562,6 +3667,150 @@ static u16 fec_enet_select_queue(struct net_device *ndev, struct sk_buff *skb,
 	return fec_enet_vlan_pri_to_queue[vlan_tag >> 13];
 }
 
+static int fec_enet_bpf(struct net_device *dev, struct netdev_bpf *bpf)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	bool is_run = netif_running(dev);
+	struct bpf_prog *old_prog;
+
+	switch (bpf->command) {
+	case XDP_SETUP_PROG:
+		/* No need to support the SoCs that require to
+		 * do the frame swap because the performance wouldn't be
+		 * better than the skb mode.
+		 */
+		if (fep->quirks & FEC_QUIRK_SWAP_FRAME)
+			return -EOPNOTSUPP;
+
+		if (is_run) {
+			napi_disable(&fep->napi);
+			netif_tx_disable(dev);
+		}
+
+		old_prog = xchg(&fep->xdp_prog, bpf->prog);
+		fec_restart(dev);
+
+		if (is_run) {
+			napi_enable(&fep->napi);
+			netif_tx_start_all_queues(dev);
+		}
+
+		if (old_prog)
+			bpf_prog_put(old_prog);
+
+		return 0;
+
+	case XDP_SETUP_XSK_POOL:
+		return -EOPNOTSUPP;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+fec_enet_xdp_get_tx_queue(struct fec_enet_private *fep, int index)
+{
+	if (unlikely(index < 0))
+		return 0;
+
+	return (index % fep->num_tx_queues);
+}
+
+static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
+				   struct fec_enet_priv_tx_q *txq,
+				   struct xdp_frame *frame)
+{
+	unsigned int index, status, estatus;
+	struct bufdesc *bdp, *last_bdp;
+	dma_addr_t dma_addr;
+	int entries_free;
+
+	entries_free = fec_enet_get_free_txdesc_num(txq);
+	if (entries_free < MAX_SKB_FRAGS + 1) {
+		netdev_err(fep->netdev, "NOT enough BD for SG!\n");
+		return NETDEV_TX_OK;
+	}
+
+	/* Fill in a Tx ring entry */
+	bdp = txq->bd.cur;
+	last_bdp = bdp;
+	status = fec16_to_cpu(bdp->cbd_sc);
+	status &= ~BD_ENET_TX_STATS;
+
+	index = fec_enet_get_bd_index(bdp, &txq->bd);
+
+	dma_addr = dma_map_single(&fep->pdev->dev, frame->data,
+				  frame->len, DMA_TO_DEVICE);
+	if (dma_mapping_error(&fep->pdev->dev, dma_addr))
+		return FEC_ENET_XDP_CONSUMED;
+
+	status |= (BD_ENET_TX_INTR | BD_ENET_TX_LAST);
+	if (fep->bufdesc_ex)
+		estatus = BD_ENET_TX_INT;
+
+	bdp->cbd_bufaddr = cpu_to_fec32(dma_addr);
+	bdp->cbd_datlen = cpu_to_fec16(frame->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);
+	}
+
+	index = fec_enet_get_bd_index(last_bdp, &txq->bd);
+	txq->tx_skbuff[index] = NULL;
+
+	/* Send it on its way.  Tell FEC it's ready, interrupt when done,
+	 * it's the last BD of the frame, and to put the CRC on the end.
+	 */
+	status |= (BD_ENET_TX_READY | BD_ENET_TX_TC);
+	bdp->cbd_sc = cpu_to_fec16(status);
+
+	/* If this was the last BD in the ring, start at the beginning again. */
+	bdp = fec_enet_get_nextdesc(last_bdp, &txq->bd);
+
+	txq->bd.cur = bdp;
+
+	return 0;
+}
+
+static int fec_enet_xdp_xmit(struct net_device *dev,
+			     int num_frames,
+			     struct xdp_frame **frames,
+			     u32 flags)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	struct fec_enet_priv_tx_q *txq;
+	int cpu = smp_processor_id();
+	struct netdev_queue *nq;
+	unsigned int queue;
+	int i;
+
+	queue = fec_enet_xdp_get_tx_queue(fep, cpu);
+	txq = fep->tx_queue[queue];
+	nq = netdev_get_tx_queue(fep->netdev, queue);
+
+	__netif_tx_lock(nq, cpu);
+
+	for (i = 0; i < num_frames; i++)
+		fec_enet_txq_xmit_frame(fep, txq, frames[i]);
+
+	/* Make sure the update to bdp and tx_skbuff are performed. */
+	wmb();
+
+	/* Trigger transmission start */
+	writel(0, txq->bd.reg_desc_active);
+
+	__netif_tx_unlock(nq);
+
+	return num_frames;
+}
+
 static const struct net_device_ops fec_netdev_ops = {
 	.ndo_open		= fec_enet_open,
 	.ndo_stop		= fec_enet_close,
@@ -3576,6 +3825,8 @@ static const struct net_device_ops fec_netdev_ops = {
 	.ndo_poll_controller	= fec_poll_controller,
 #endif
 	.ndo_set_features	= fec_set_features,
+	.ndo_bpf		= fec_enet_bpf,
+	.ndo_xdp_xmit		= fec_enet_xdp_xmit,
 };
 
 static const unsigned short offset_des_active_rxq[] = {