Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 2188 insertions, 0 deletions

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
new file mode 100644
index 000000000..71151f675
--- /dev/null
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -0,0 +1,2188 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Applied Micro X-Gene SoC Ethernet Driver
+ *
+ * Copyright (c) 2014, Applied Micro Circuits Corporation
+ * Authors: Iyappan Subramanian <isubramanian@apm.com>
+ *	    Ravi Patel <rapatel@apm.com>
+ *	    Keyur Chudgar <kchudgar@apm.com>
+ */
+
+#include <linux/gpio.h>
+#include "xgene_enet_main.h"
+#include "xgene_enet_hw.h"
+#include "xgene_enet_sgmac.h"
+#include "xgene_enet_xgmac.h"
+
+#define RES_ENET_CSR	0
+#define RES_RING_CSR	1
+#define RES_RING_CMD	2
+
+static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool)
+{
+	struct xgene_enet_raw_desc16 *raw_desc;
+	int i;
+
+	if (!buf_pool)
+		return;
+
+	for (i = 0; i < buf_pool->slots; i++) {
+		raw_desc = &buf_pool->raw_desc16[i];
+
+		/* Hardware expects descriptor in little endian format */
+		raw_desc->m0 = cpu_to_le64(i |
+				SET_VAL(FPQNUM, buf_pool->dst_ring_num) |
+				SET_VAL(STASH, 3));
+	}
+}
+
+static u16 xgene_enet_get_data_len(u64 bufdatalen)
+{
+	u16 hw_len, mask;
+
+	hw_len = GET_VAL(BUFDATALEN, bufdatalen);
+
+	if (unlikely(hw_len == 0x7800)) {
+		return 0;
+	} else if (!(hw_len & BIT(14))) {
+		mask = GENMASK(13, 0);
+		return (hw_len & mask) ? (hw_len & mask) : SIZE_16K;
+	} else if (!(hw_len & GENMASK(13, 12))) {
+		mask = GENMASK(11, 0);
+		return (hw_len & mask) ? (hw_len & mask) : SIZE_4K;
+	} else {
+		mask = GENMASK(11, 0);
+		return (hw_len & mask) ? (hw_len & mask) : SIZE_2K;
+	}
+}
+
+static u16 xgene_enet_set_data_len(u32 size)
+{
+	u16 hw_len;
+
+	hw_len =  (size == SIZE_4K) ? BIT(14) : 0;
+
+	return hw_len;
+}
+
+static int xgene_enet_refill_pagepool(struct xgene_enet_desc_ring *buf_pool,
+				      u32 nbuf)
+{
+	struct xgene_enet_raw_desc16 *raw_desc;
+	struct xgene_enet_pdata *pdata;
+	struct net_device *ndev;
+	dma_addr_t dma_addr;
+	struct device *dev;
+	struct page *page;
+	u32 slots, tail;
+	u16 hw_len;
+	int i;
+
+	if (unlikely(!buf_pool))
+		return 0;
+
+	ndev = buf_pool->ndev;
+	pdata = netdev_priv(ndev);
+	dev = ndev_to_dev(ndev);
+	slots = buf_pool->slots - 1;
+	tail = buf_pool->tail;
+
+	for (i = 0; i < nbuf; i++) {
+		raw_desc = &buf_pool->raw_desc16[tail];
+
+		page = dev_alloc_page();
+		if (unlikely(!page))
+			return -ENOMEM;
+
+		dma_addr = dma_map_page(dev, page, 0,
+					PAGE_SIZE, DMA_FROM_DEVICE);
+		if (unlikely(dma_mapping_error(dev, dma_addr))) {
+			put_page(page);
+			return -ENOMEM;
+		}
+
+		hw_len = xgene_enet_set_data_len(PAGE_SIZE);
+		raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
+					   SET_VAL(BUFDATALEN, hw_len) |
+					   SET_BIT(COHERENT));
+
+		buf_pool->frag_page[tail] = page;
+		tail = (tail + 1) & slots;
+	}
+
+	pdata->ring_ops->wr_cmd(buf_pool, nbuf);
+	buf_pool->tail = tail;
+
+	return 0;
+}
+
+static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool,
+				     u32 nbuf)
+{
+	struct sk_buff *skb;
+	struct xgene_enet_raw_desc16 *raw_desc;
+	struct xgene_enet_pdata *pdata;
+	struct net_device *ndev;
+	struct device *dev;
+	dma_addr_t dma_addr;
+	u32 tail = buf_pool->tail;
+	u32 slots = buf_pool->slots - 1;
+	u16 bufdatalen, len;
+	int i;
+
+	ndev = buf_pool->ndev;
+	dev = ndev_to_dev(buf_pool->ndev);
+	pdata = netdev_priv(ndev);
+
+	bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0));
+	len = XGENE_ENET_STD_MTU;
+
+	for (i = 0; i < nbuf; i++) {
+		raw_desc = &buf_pool->raw_desc16[tail];
+
+		skb = netdev_alloc_skb_ip_align(ndev, len);
+		if (unlikely(!skb))
+			return -ENOMEM;
+
+		dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
+		if (dma_mapping_error(dev, dma_addr)) {
+			netdev_err(ndev, "DMA mapping error\n");
+			dev_kfree_skb_any(skb);
+			return -EINVAL;
+		}
+
+		buf_pool->rx_skb[tail] = skb;
+
+		raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
+					   SET_VAL(BUFDATALEN, bufdatalen) |
+					   SET_BIT(COHERENT));
+		tail = (tail + 1) & slots;
+	}
+
+	pdata->ring_ops->wr_cmd(buf_pool, nbuf);
+	buf_pool->tail = tail;
+
+	return 0;
+}
+
+static u8 xgene_enet_hdr_len(const void *data)
+{
+	const struct ethhdr *eth = data;
+
+	return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN;
+}
+
+static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool)
+{
+	struct device *dev = ndev_to_dev(buf_pool->ndev);
+	struct xgene_enet_raw_desc16 *raw_desc;
+	dma_addr_t dma_addr;
+	int i;
+
+	/* Free up the buffers held by hardware */
+	for (i = 0; i < buf_pool->slots; i++) {
+		if (buf_pool->rx_skb[i]) {
+			dev_kfree_skb_any(buf_pool->rx_skb[i]);
+
+			raw_desc = &buf_pool->raw_desc16[i];
+			dma_addr = GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1));
+			dma_unmap_single(dev, dma_addr, XGENE_ENET_MAX_MTU,
+					 DMA_FROM_DEVICE);
+		}
+	}
+}
+
+static void xgene_enet_delete_pagepool(struct xgene_enet_desc_ring *buf_pool)
+{
+	struct device *dev = ndev_to_dev(buf_pool->ndev);
+	dma_addr_t dma_addr;
+	struct page *page;
+	int i;
+
+	/* Free up the buffers held by hardware */
+	for (i = 0; i < buf_pool->slots; i++) {
+		page = buf_pool->frag_page[i];
+		if (page) {
+			dma_addr = buf_pool->frag_dma_addr[i];
+			dma_unmap_page(dev, dma_addr, PAGE_SIZE,
+				       DMA_FROM_DEVICE);
+			put_page(page);
+		}
+	}
+}
+
+static irqreturn_t xgene_enet_rx_irq(const int irq, void *data)
+{
+	struct xgene_enet_desc_ring *rx_ring = data;
+
+	if (napi_schedule_prep(&rx_ring->napi)) {
+		disable_irq_nosync(irq);
+		__napi_schedule(&rx_ring->napi);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
+				    struct xgene_enet_raw_desc *raw_desc)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(cp_ring->ndev);
+	struct sk_buff *skb;
+	struct device *dev;
+	skb_frag_t *frag;
+	dma_addr_t *frag_dma_addr;
+	u16 skb_index;
+	u8 mss_index;
+	u8 status;
+	int i;
+
+	skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
+	skb = cp_ring->cp_skb[skb_index];
+	frag_dma_addr = &cp_ring->frag_dma_addr[skb_index * MAX_SKB_FRAGS];
+
+	dev = ndev_to_dev(cp_ring->ndev);
+	dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
+			 skb_headlen(skb),
+			 DMA_TO_DEVICE);
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		frag = &skb_shinfo(skb)->frags[i];
+		dma_unmap_page(dev, frag_dma_addr[i], skb_frag_size(frag),
+			       DMA_TO_DEVICE);
+	}
+
+	if (GET_BIT(ET, le64_to_cpu(raw_desc->m3))) {
+		mss_index = GET_VAL(MSS, le64_to_cpu(raw_desc->m3));
+		spin_lock(&pdata->mss_lock);
+		pdata->mss_refcnt[mss_index]--;
+		spin_unlock(&pdata->mss_lock);
+	}
+
+	/* Checking for error */
+	status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
+	if (unlikely(status > 2)) {
+		cp_ring->tx_dropped++;
+		cp_ring->tx_errors++;
+	}
+
+	if (likely(skb)) {
+		dev_kfree_skb_any(skb);
+	} else {
+		netdev_err(cp_ring->ndev, "completion skb is NULL\n");
+	}
+
+	return 0;
+}
+
+static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	int mss_index = -EBUSY;
+	int i;
+
+	spin_lock(&pdata->mss_lock);
+
+	/* Reuse the slot if MSS matches */
+	for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) {
+		if (pdata->mss[i] == mss) {
+			pdata->mss_refcnt[i]++;
+			mss_index = i;
+		}
+	}
+
+	/* Overwrite the slot with ref_count = 0 */
+	for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) {
+		if (!pdata->mss_refcnt[i]) {
+			pdata->mss_refcnt[i]++;
+			pdata->mac_ops->set_mss(pdata, mss, i);
+			pdata->mss[i] = mss;
+			mss_index = i;
+		}
+	}
+
+	spin_unlock(&pdata->mss_lock);
+
+	return mss_index;
+}
+
+static int xgene_enet_work_msg(struct sk_buff *skb, u64 *hopinfo)
+{
+	struct net_device *ndev = skb->dev;
+	struct iphdr *iph;
+	u8 l3hlen = 0, l4hlen = 0;
+	u8 ethhdr, proto = 0, csum_enable = 0;
+	u32 hdr_len, mss = 0;
+	u32 i, len, nr_frags;
+	int mss_index;
+
+	ethhdr = xgene_enet_hdr_len(skb->data);
+
+	if (unlikely(skb->protocol != htons(ETH_P_IP)) &&
+	    unlikely(skb->protocol != htons(ETH_P_8021Q)))
+		goto out;
+
+	if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM)))
+		goto out;
+
+	iph = ip_hdr(skb);
+	if (unlikely(ip_is_fragment(iph)))
+		goto out;
+
+	if (likely(iph->protocol == IPPROTO_TCP)) {
+		l4hlen = tcp_hdrlen(skb) >> 2;
+		csum_enable = 1;
+		proto = TSO_IPPROTO_TCP;
+		if (ndev->features & NETIF_F_TSO) {
+			hdr_len = ethhdr + ip_hdrlen(skb) + tcp_hdrlen(skb);
+			mss = skb_shinfo(skb)->gso_size;
+
+			if (skb_is_nonlinear(skb)) {
+				len = skb_headlen(skb);
+				nr_frags = skb_shinfo(skb)->nr_frags;
+
+				for (i = 0; i < 2 && i < nr_frags; i++)
+					len += skb_frag_size(
+						&skb_shinfo(skb)->frags[i]);
+
+				/* HW requires header must reside in 3 buffer */
+				if (unlikely(hdr_len > len)) {
+					if (skb_linearize(skb))
+						return 0;
+				}
+			}
+
+			if (!mss || ((skb->len - hdr_len) <= mss))
+				goto out;
+
+			mss_index = xgene_enet_setup_mss(ndev, mss);
+			if (unlikely(mss_index < 0))
+				return -EBUSY;
+
+			*hopinfo |= SET_BIT(ET) | SET_VAL(MSS, mss_index);
+		}
+	} else if (iph->protocol == IPPROTO_UDP) {
+		l4hlen = UDP_HDR_SIZE;
+		csum_enable = 1;
+	}
+out:
+	l3hlen = ip_hdrlen(skb) >> 2;
+	*hopinfo |= SET_VAL(TCPHDR, l4hlen) |
+		    SET_VAL(IPHDR, l3hlen) |
+		    SET_VAL(ETHHDR, ethhdr) |
+		    SET_VAL(EC, csum_enable) |
+		    SET_VAL(IS, proto) |
+		    SET_BIT(IC) |
+		    SET_BIT(TYPE_ETH_WORK_MESSAGE);
+
+	return 0;
+}
+
+static u16 xgene_enet_encode_len(u16 len)
+{
+	return (len == BUFLEN_16K) ? 0 : len;
+}
+
+static void xgene_set_addr_len(__le64 *desc, u32 idx, dma_addr_t addr, u32 len)
+{
+	desc[idx ^ 1] = cpu_to_le64(SET_VAL(DATAADDR, addr) |
+				    SET_VAL(BUFDATALEN, len));
+}
+
+static __le64 *xgene_enet_get_exp_bufs(struct xgene_enet_desc_ring *ring)
+{
+	__le64 *exp_bufs;
+
+	exp_bufs = &ring->exp_bufs[ring->exp_buf_tail * MAX_EXP_BUFFS];
+	memset(exp_bufs, 0, sizeof(__le64) * MAX_EXP_BUFFS);
+	ring->exp_buf_tail = (ring->exp_buf_tail + 1) & ((ring->slots / 2) - 1);
+
+	return exp_bufs;
+}
+
+static dma_addr_t *xgene_get_frag_dma_array(struct xgene_enet_desc_ring *ring)
+{
+	return &ring->cp_ring->frag_dma_addr[ring->tail * MAX_SKB_FRAGS];
+}
+
+static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
+				    struct sk_buff *skb)
+{
+	struct device *dev = ndev_to_dev(tx_ring->ndev);
+	struct xgene_enet_pdata *pdata = netdev_priv(tx_ring->ndev);
+	struct xgene_enet_raw_desc *raw_desc;
+	__le64 *exp_desc = NULL, *exp_bufs = NULL;
+	dma_addr_t dma_addr, pbuf_addr, *frag_dma_addr;
+	skb_frag_t *frag;
+	u16 tail = tx_ring->tail;
+	u64 hopinfo = 0;
+	u32 len, hw_len;
+	u8 ll = 0, nv = 0, idx = 0;
+	bool split = false;
+	u32 size, offset, ell_bytes = 0;
+	u32 i, fidx, nr_frags, count = 1;
+	int ret;
+
+	raw_desc = &tx_ring->raw_desc[tail];
+	tail = (tail + 1) & (tx_ring->slots - 1);
+	memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
+
+	ret = xgene_enet_work_msg(skb, &hopinfo);
+	if (ret)
+		return ret;
+
+	raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
+				   hopinfo);
+
+	len = skb_headlen(skb);
+	hw_len = xgene_enet_encode_len(len);
+
+	dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, dma_addr)) {
+		netdev_err(tx_ring->ndev, "DMA mapping error\n");
+		return -EINVAL;
+	}
+
+	/* Hardware expects descriptor in little endian format */
+	raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
+				   SET_VAL(BUFDATALEN, hw_len) |
+				   SET_BIT(COHERENT));
+
+	if (!skb_is_nonlinear(skb))
+		goto out;
+
+	/* scatter gather */
+	nv = 1;
+	exp_desc = (void *)&tx_ring->raw_desc[tail];
+	tail = (tail + 1) & (tx_ring->slots - 1);
+	memset(exp_desc, 0, sizeof(struct xgene_enet_raw_desc));
+
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	for (i = nr_frags; i < 4 ; i++)
+		exp_desc[i ^ 1] = cpu_to_le64(LAST_BUFFER);
+
+	frag_dma_addr = xgene_get_frag_dma_array(tx_ring);
+
+	for (i = 0, fidx = 0; split || (fidx < nr_frags); i++) {
+		if (!split) {
+			frag = &skb_shinfo(skb)->frags[fidx];
+			size = skb_frag_size(frag);
+			offset = 0;
+
+			pbuf_addr = skb_frag_dma_map(dev, frag, 0, size,
+						     DMA_TO_DEVICE);
+			if (dma_mapping_error(dev, pbuf_addr))
+				return -EINVAL;
+
+			frag_dma_addr[fidx] = pbuf_addr;
+			fidx++;
+
+			if (size > BUFLEN_16K)
+				split = true;
+		}
+
+		if (size > BUFLEN_16K) {
+			len = BUFLEN_16K;
+			size -= BUFLEN_16K;
+		} else {
+			len = size;
+			split = false;
+		}
+
+		dma_addr = pbuf_addr + offset;
+		hw_len = xgene_enet_encode_len(len);
+
+		switch (i) {
+		case 0:
+		case 1:
+		case 2:
+			xgene_set_addr_len(exp_desc, i, dma_addr, hw_len);
+			break;
+		case 3:
+			if (split || (fidx != nr_frags)) {
+				exp_bufs = xgene_enet_get_exp_bufs(tx_ring);
+				xgene_set_addr_len(exp_bufs, idx, dma_addr,
+						   hw_len);
+				idx++;
+				ell_bytes += len;
+			} else {
+				xgene_set_addr_len(exp_desc, i, dma_addr,
+						   hw_len);
+			}
+			break;
+		default:
+			xgene_set_addr_len(exp_bufs, idx, dma_addr, hw_len);
+			idx++;
+			ell_bytes += len;
+			break;
+		}
+
+		if (split)
+			offset += BUFLEN_16K;
+	}
+	count++;
+
+	if (idx) {
+		ll = 1;
+		dma_addr = dma_map_single(dev, exp_bufs,
+					  sizeof(u64) * MAX_EXP_BUFFS,
+					  DMA_TO_DEVICE);
+		if (dma_mapping_error(dev, dma_addr)) {
+			dev_kfree_skb_any(skb);
+			return -EINVAL;
+		}
+		i = ell_bytes >> LL_BYTES_LSB_LEN;
+		exp_desc[2] = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
+					  SET_VAL(LL_BYTES_MSB, i) |
+					  SET_VAL(LL_LEN, idx));
+		raw_desc->m2 = cpu_to_le64(SET_VAL(LL_BYTES_LSB, ell_bytes));
+	}
+
+out:
+	raw_desc->m0 = cpu_to_le64(SET_VAL(LL, ll) | SET_VAL(NV, nv) |
+				   SET_VAL(USERINFO, tx_ring->tail));
+	tx_ring->cp_ring->cp_skb[tx_ring->tail] = skb;
+	pdata->tx_level[tx_ring->cp_ring->index] += count;
+	tx_ring->tail = tail;
+
+	return count;
+}
+
+static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
+					 struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct xgene_enet_desc_ring *tx_ring;
+	int index = skb->queue_mapping;
+	u32 tx_level = pdata->tx_level[index];
+	int count;
+
+	tx_ring = pdata->tx_ring[index];
+	if (tx_level < pdata->txc_level[index])
+		tx_level += ((typeof(pdata->tx_level[index]))~0U);
+
+	if ((tx_level - pdata->txc_level[index]) > pdata->tx_qcnt_hi) {
+		netif_stop_subqueue(ndev, index);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (skb_padto(skb, XGENE_MIN_ENET_FRAME_SIZE))
+		return NETDEV_TX_OK;
+
+	count = xgene_enet_setup_tx_desc(tx_ring, skb);
+	if (count == -EBUSY)
+		return NETDEV_TX_BUSY;
+
+	if (count <= 0) {
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
+	skb_tx_timestamp(skb);
+
+	tx_ring->tx_packets++;
+	tx_ring->tx_bytes += skb->len;
+
+	pdata->ring_ops->wr_cmd(tx_ring, count);
+	return NETDEV_TX_OK;
+}
+
+static void xgene_enet_rx_csum(struct sk_buff *skb)
+{
+	struct net_device *ndev = skb->dev;
+	struct iphdr *iph = ip_hdr(skb);
+
+	if (!(ndev->features & NETIF_F_RXCSUM))
+		return;
+
+	if (skb->protocol != htons(ETH_P_IP))
+		return;
+
+	if (ip_is_fragment(iph))
+		return;
+
+	if (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)
+		return;
+
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+}
+
+static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool,
+				     struct xgene_enet_raw_desc *raw_desc,
+				     struct xgene_enet_raw_desc *exp_desc)
+{
+	__le64 *desc = (void *)exp_desc;
+	dma_addr_t dma_addr;
+	struct device *dev;
+	struct page *page;
+	u16 slots, head;
+	u32 frag_size;
+	int i;
+
+	if (!buf_pool || !raw_desc || !exp_desc ||
+	    (!GET_VAL(NV, le64_to_cpu(raw_desc->m0))))
+		return;
+
+	dev = ndev_to_dev(buf_pool->ndev);
+	slots = buf_pool->slots - 1;
+	head = buf_pool->head;
+
+	for (i = 0; i < 4; i++) {
+		frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1]));
+		if (!frag_size)
+			break;
+
+		dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1]));
+		dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
+
+		page = buf_pool->frag_page[head];
+		put_page(page);
+
+		buf_pool->frag_page[head] = NULL;
+		head = (head + 1) & slots;
+	}
+	buf_pool->head = head;
+}
+
+/* Errata 10GE_10 and ENET_15 - Fix duplicated HW statistic counters */
+static bool xgene_enet_errata_10GE_10(struct sk_buff *skb, u32 len, u8 status)
+{
+	if (status == INGRESS_CRC &&
+	    len >= (ETHER_STD_PACKET + 1) &&
+	    len <= (ETHER_STD_PACKET + 4) &&
+	    skb->protocol == htons(ETH_P_8021Q))
+		return true;
+
+	return false;
+}
+
+/* Errata 10GE_8 and ENET_11 - allow packet with length <=64B */
+static bool xgene_enet_errata_10GE_8(struct sk_buff *skb, u32 len, u8 status)
+{
+	if (status == INGRESS_PKT_LEN && len == ETHER_MIN_PACKET) {
+		if (ntohs(eth_hdr(skb)->h_proto) < 46)
+			return true;
+	}
+
+	return false;
+}
+
+static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
+			       struct xgene_enet_raw_desc *raw_desc,
+			       struct xgene_enet_raw_desc *exp_desc)
+{
+	struct xgene_enet_desc_ring *buf_pool, *page_pool;
+	u32 datalen, frag_size, skb_index;
+	struct xgene_enet_pdata *pdata;
+	struct net_device *ndev;
+	dma_addr_t dma_addr;
+	struct sk_buff *skb;
+	struct device *dev;
+	struct page *page;
+	u16 slots, head;
+	int i, ret = 0;
+	__le64 *desc;
+	u8 status;
+	bool nv;
+
+	ndev = rx_ring->ndev;
+	pdata = netdev_priv(ndev);
+	dev = ndev_to_dev(rx_ring->ndev);
+	buf_pool = rx_ring->buf_pool;
+	page_pool = rx_ring->page_pool;
+
+	dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
+			 XGENE_ENET_STD_MTU, DMA_FROM_DEVICE);
+	skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
+	skb = buf_pool->rx_skb[skb_index];
+	buf_pool->rx_skb[skb_index] = NULL;
+
+	datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
+
+	/* strip off CRC as HW isn't doing this */
+	nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
+	if (!nv)
+		datalen -= 4;
+
+	skb_put(skb, datalen);
+	prefetch(skb->data - NET_IP_ALIGN);
+	skb->protocol = eth_type_trans(skb, ndev);
+
+	/* checking for error */
+	status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) |
+		  GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
+	if (unlikely(status)) {
+		if (xgene_enet_errata_10GE_8(skb, datalen, status)) {
+			pdata->false_rflr++;
+		} else if (xgene_enet_errata_10GE_10(skb, datalen, status)) {
+			pdata->vlan_rjbr++;
+		} else {
+			dev_kfree_skb_any(skb);
+			xgene_enet_free_pagepool(page_pool, raw_desc, exp_desc);
+			xgene_enet_parse_error(rx_ring, status);
+			rx_ring->rx_dropped++;
+			goto out;
+		}
+	}
+
+	if (!nv)
+		goto skip_jumbo;
+
+	slots = page_pool->slots - 1;
+	head = page_pool->head;
+	desc = (void *)exp_desc;
+
+	for (i = 0; i < 4; i++) {
+		frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1]));
+		if (!frag_size)
+			break;
+
+		dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1]));
+		dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
+
+		page = page_pool->frag_page[head];
+		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
+				frag_size, PAGE_SIZE);
+
+		datalen += frag_size;
+
+		page_pool->frag_page[head] = NULL;
+		head = (head + 1) & slots;
+	}
+
+	page_pool->head = head;
+	rx_ring->npagepool -= skb_shinfo(skb)->nr_frags;
+
+skip_jumbo:
+	skb_checksum_none_assert(skb);
+	xgene_enet_rx_csum(skb);
+
+	rx_ring->rx_packets++;
+	rx_ring->rx_bytes += datalen;
+	napi_gro_receive(&rx_ring->napi, skb);
+
+out:
+	if (rx_ring->npagepool <= 0) {
+		ret = xgene_enet_refill_pagepool(page_pool, NUM_NXTBUFPOOL);
+		rx_ring->npagepool = NUM_NXTBUFPOOL;
+		if (ret)
+			return ret;
+	}
+
+	if (--rx_ring->nbufpool == 0) {
+		ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL);
+		rx_ring->nbufpool = NUM_BUFPOOL;
+	}
+
+	return ret;
+}
+
+static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc)
+{
+	return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false;
+}
+
+static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
+				   int budget)
+{
+	struct net_device *ndev = ring->ndev;
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct xgene_enet_raw_desc *raw_desc, *exp_desc;
+	u16 head = ring->head;
+	u16 slots = ring->slots - 1;
+	int ret, desc_count, count = 0, processed = 0;
+	bool is_completion;
+
+	do {
+		raw_desc = &ring->raw_desc[head];
+		desc_count = 0;
+		is_completion = false;
+		exp_desc = NULL;
+		if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc)))
+			break;
+
+		/* read fpqnum field after dataaddr field */
+		dma_rmb();
+		if (GET_BIT(NV, le64_to_cpu(raw_desc->m0))) {
+			head = (head + 1) & slots;
+			exp_desc = &ring->raw_desc[head];
+
+			if (unlikely(xgene_enet_is_desc_slot_empty(exp_desc))) {
+				head = (head - 1) & slots;
+				break;
+			}
+			dma_rmb();
+			count++;
+			desc_count++;
+		}
+		if (is_rx_desc(raw_desc)) {
+			ret = xgene_enet_rx_frame(ring, raw_desc, exp_desc);
+		} else {
+			ret = xgene_enet_tx_completion(ring, raw_desc);
+			is_completion = true;
+		}
+		xgene_enet_mark_desc_slot_empty(raw_desc);
+		if (exp_desc)
+			xgene_enet_mark_desc_slot_empty(exp_desc);
+
+		head = (head + 1) & slots;
+		count++;
+		desc_count++;
+		processed++;
+		if (is_completion)
+			pdata->txc_level[ring->index] += desc_count;
+
+		if (ret)
+			break;
+	} while (--budget);
+
+	if (likely(count)) {
+		pdata->ring_ops->wr_cmd(ring, -count);
+		ring->head = head;
+
+		if (__netif_subqueue_stopped(ndev, ring->index))
+			netif_start_subqueue(ndev, ring->index);
+	}
+
+	return processed;
+}
+
+static int xgene_enet_napi(struct napi_struct *napi, const int budget)
+{
+	struct xgene_enet_desc_ring *ring;
+	int processed;
+
+	ring = container_of(napi, struct xgene_enet_desc_ring, napi);
+	processed = xgene_enet_process_ring(ring, budget);
+
+	if (processed != budget) {
+		napi_complete_done(napi, processed);
+		enable_irq(ring->irq);
+	}
+
+	return processed;
+}
+
+static void xgene_enet_timeout(struct net_device *ndev, unsigned int txqueue)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct netdev_queue *txq;
+	int i;
+
+	pdata->mac_ops->reset(pdata);
+
+	for (i = 0; i < pdata->txq_cnt; i++) {
+		txq = netdev_get_tx_queue(ndev, i);
+		txq->trans_start = jiffies;
+		netif_tx_start_queue(txq);
+	}
+}
+
+static void xgene_enet_set_irq_name(struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct xgene_enet_desc_ring *ring;
+	int i;
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		if (!pdata->cq_cnt) {
+			snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc",
+				 ndev->name);
+		} else {
+			snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-%d",
+				 ndev->name, i);
+		}
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		ring = pdata->tx_ring[i]->cp_ring;
+		snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-txc-%d",
+			 ndev->name, i);
+	}
+}
+
+static int xgene_enet_register_irq(struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct device *dev = ndev_to_dev(ndev);
+	struct xgene_enet_desc_ring *ring;
+	int ret = 0, i;
+
+	xgene_enet_set_irq_name(ndev);
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
+		ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
+				       0, ring->irq_name, ring);
+		if (ret) {
+			netdev_err(ndev, "Failed to request irq %s\n",
+				   ring->irq_name);
+		}
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		ring = pdata->tx_ring[i]->cp_ring;
+		irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
+		ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
+				       0, ring->irq_name, ring);
+		if (ret) {
+			netdev_err(ndev, "Failed to request irq %s\n",
+				   ring->irq_name);
+		}
+	}
+
+	return ret;
+}
+
+static void xgene_enet_free_irq(struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata;
+	struct xgene_enet_desc_ring *ring;
+	struct device *dev;
+	int i;
+
+	pdata = netdev_priv(ndev);
+	dev = ndev_to_dev(ndev);
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
+		devm_free_irq(dev, ring->irq, ring);
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		ring = pdata->tx_ring[i]->cp_ring;
+		irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
+		devm_free_irq(dev, ring->irq, ring);
+	}
+}
+
+static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata)
+{
+	struct napi_struct *napi;
+	int i;
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		napi = &pdata->rx_ring[i]->napi;
+		napi_enable(napi);
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		napi = &pdata->tx_ring[i]->cp_ring->napi;
+		napi_enable(napi);
+	}
+}
+
+static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata)
+{
+	struct napi_struct *napi;
+	int i;
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		napi = &pdata->rx_ring[i]->napi;
+		napi_disable(napi);
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		napi = &pdata->tx_ring[i]->cp_ring->napi;
+		napi_disable(napi);
+	}
+}
+
+static int xgene_enet_open(struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
+	int ret;
+
+	ret = netif_set_real_num_tx_queues(ndev, pdata->txq_cnt);
+	if (ret)
+		return ret;
+
+	ret = netif_set_real_num_rx_queues(ndev, pdata->rxq_cnt);
+	if (ret)
+		return ret;
+
+	xgene_enet_napi_enable(pdata);
+	ret = xgene_enet_register_irq(ndev);
+	if (ret) {
+		xgene_enet_napi_disable(pdata);
+		return ret;
+	}
+
+	if (ndev->phydev) {
+		phy_start(ndev->phydev);
+	} else {
+		schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF);
+		netif_carrier_off(ndev);
+	}
+
+	mac_ops->tx_enable(pdata);
+	mac_ops->rx_enable(pdata);
+	netif_tx_start_all_queues(ndev);
+
+	return ret;
+}
+
+static int xgene_enet_close(struct net_device *ndev)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
+	int i;
+
+	netif_tx_stop_all_queues(ndev);
+	mac_ops->tx_disable(pdata);
+	mac_ops->rx_disable(pdata);
+
+	if (ndev->phydev)
+		phy_stop(ndev->phydev);
+	else
+		cancel_delayed_work_sync(&pdata->link_work);
+
+	xgene_enet_free_irq(ndev);
+	xgene_enet_napi_disable(pdata);
+	for (i = 0; i < pdata->rxq_cnt; i++)
+		xgene_enet_process_ring(pdata->rx_ring[i], -1);
+
+	return 0;
+}
+static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring)
+{
+	struct xgene_enet_pdata *pdata;
+	struct device *dev;
+
+	pdata = netdev_priv(ring->ndev);
+	dev = ndev_to_dev(ring->ndev);
+
+	pdata->ring_ops->clear(ring);
+	dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
+}
+
+static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata)
+{
+	struct xgene_enet_desc_ring *buf_pool, *page_pool;
+	struct xgene_enet_desc_ring *ring;
+	int i;
+
+	for (i = 0; i < pdata->txq_cnt; i++) {
+		ring = pdata->tx_ring[i];
+		if (ring) {
+			xgene_enet_delete_ring(ring);
+			pdata->port_ops->clear(pdata, ring);
+			if (pdata->cq_cnt)
+				xgene_enet_delete_ring(ring->cp_ring);
+			pdata->tx_ring[i] = NULL;
+		}
+
+	}
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		if (ring) {
+			page_pool = ring->page_pool;
+			if (page_pool) {
+				xgene_enet_delete_pagepool(page_pool);
+				xgene_enet_delete_ring(page_pool);
+				pdata->port_ops->clear(pdata, page_pool);
+			}
+
+			buf_pool = ring->buf_pool;
+			xgene_enet_delete_bufpool(buf_pool);
+			xgene_enet_delete_ring(buf_pool);
+			pdata->port_ops->clear(pdata, buf_pool);
+
+			xgene_enet_delete_ring(ring);
+			pdata->rx_ring[i] = NULL;
+		}
+
+	}
+}
+
+static int xgene_enet_get_ring_size(struct device *dev,
+				    enum xgene_enet_ring_cfgsize cfgsize)
+{
+	int size = -EINVAL;
+
+	switch (cfgsize) {
+	case RING_CFGSIZE_512B:
+		size = 0x200;
+		break;
+	case RING_CFGSIZE_2KB:
+		size = 0x800;
+		break;
+	case RING_CFGSIZE_16KB:
+		size = 0x4000;
+		break;
+	case RING_CFGSIZE_64KB:
+		size = 0x10000;
+		break;
+	case RING_CFGSIZE_512KB:
+		size = 0x80000;
+		break;
+	default:
+		dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize);
+		break;
+	}
+
+	return size;
+}
+
+static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring)
+{
+	struct xgene_enet_pdata *pdata;
+	struct device *dev;
+
+	if (!ring)
+		return;
+
+	dev = ndev_to_dev(ring->ndev);
+	pdata = netdev_priv(ring->ndev);
+
+	if (ring->desc_addr) {
+		pdata->ring_ops->clear(ring);
+		dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
+	}
+	devm_kfree(dev, ring);
+}
+
+static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata)
+{
+	struct xgene_enet_desc_ring *page_pool;
+	struct device *dev = &pdata->pdev->dev;
+	struct xgene_enet_desc_ring *ring;
+	void *p;
+	int i;
+
+	for (i = 0; i < pdata->txq_cnt; i++) {
+		ring = pdata->tx_ring[i];
+		if (ring) {
+			if (ring->cp_ring && ring->cp_ring->cp_skb)
+				devm_kfree(dev, ring->cp_ring->cp_skb);
+
+			if (ring->cp_ring && pdata->cq_cnt)
+				xgene_enet_free_desc_ring(ring->cp_ring);
+
+			xgene_enet_free_desc_ring(ring);
+		}
+
+	}
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		if (ring) {
+			if (ring->buf_pool) {
+				if (ring->buf_pool->rx_skb)
+					devm_kfree(dev, ring->buf_pool->rx_skb);
+
+				xgene_enet_free_desc_ring(ring->buf_pool);
+			}
+
+			page_pool = ring->page_pool;
+			if (page_pool) {
+				p = page_pool->frag_page;
+				if (p)
+					devm_kfree(dev, p);
+
+				p = page_pool->frag_dma_addr;
+				if (p)
+					devm_kfree(dev, p);
+			}
+
+			xgene_enet_free_desc_ring(ring);
+		}
+	}
+}
+
+static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata,
+				 struct xgene_enet_desc_ring *ring)
+{
+	if ((pdata->enet_id == XGENE_ENET2) &&
+	    (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) {
+		return true;
+	}
+
+	return false;
+}
+
+static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata,
+					      struct xgene_enet_desc_ring *ring)
+{
+	u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift;
+
+	return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift);
+}
+
+static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
+			struct net_device *ndev, u32 ring_num,
+			enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct device *dev = ndev_to_dev(ndev);
+	struct xgene_enet_desc_ring *ring;
+	void *irq_mbox_addr;
+	int size;
+
+	size = xgene_enet_get_ring_size(dev, cfgsize);
+	if (size < 0)
+		return NULL;
+
+	ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
+			    GFP_KERNEL);
+	if (!ring)
+		return NULL;
+
+	ring->ndev = ndev;
+	ring->num = ring_num;
+	ring->cfgsize = cfgsize;
+	ring->id = ring_id;
+
+	ring->desc_addr = dmam_alloc_coherent(dev, size, &ring->dma,
+					      GFP_KERNEL | __GFP_ZERO);
+	if (!ring->desc_addr) {
+		devm_kfree(dev, ring);
+		return NULL;
+	}
+	ring->size = size;
+
+	if (is_irq_mbox_required(pdata, ring)) {
+		irq_mbox_addr = dmam_alloc_coherent(dev, INTR_MBOX_SIZE,
+						    &ring->irq_mbox_dma,
+						    GFP_KERNEL | __GFP_ZERO);
+		if (!irq_mbox_addr) {
+			dmam_free_coherent(dev, size, ring->desc_addr,
+					   ring->dma);
+			devm_kfree(dev, ring);
+			return NULL;
+		}
+		ring->irq_mbox_addr = irq_mbox_addr;
+	}
+
+	ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring);
+	ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR;
+	ring = pdata->ring_ops->setup(ring);
+	netdev_dbg(ndev, "ring info: num=%d  size=%d  id=%d  slots=%d\n",
+		   ring->num, ring->size, ring->id, ring->slots);
+
+	return ring;
+}
+
+static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum)
+{
+	return (owner << 6) | (bufnum & GENMASK(5, 0));
+}
+
+static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p)
+{
+	enum xgene_ring_owner owner;
+
+	if (p->enet_id == XGENE_ENET1) {
+		switch (p->phy_mode) {
+		case PHY_INTERFACE_MODE_SGMII:
+			owner = RING_OWNER_ETH0;
+			break;
+		default:
+			owner = (!p->port_id) ? RING_OWNER_ETH0 :
+						RING_OWNER_ETH1;
+			break;
+		}
+	} else {
+		owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1;
+	}
+
+	return owner;
+}
+
+static u8 xgene_start_cpu_bufnum(struct xgene_enet_pdata *pdata)
+{
+	struct device *dev = &pdata->pdev->dev;
+	u32 cpu_bufnum;
+	int ret;
+
+	ret = device_property_read_u32(dev, "channel", &cpu_bufnum);
+
+	return (!ret) ? cpu_bufnum : pdata->cpu_bufnum;
+}
+
+static int xgene_enet_create_desc_rings(struct net_device *ndev)
+{
+	struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring;
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct xgene_enet_desc_ring *page_pool = NULL;
+	struct xgene_enet_desc_ring *buf_pool = NULL;
+	struct device *dev = ndev_to_dev(ndev);
+	u8 eth_bufnum = pdata->eth_bufnum;
+	u8 bp_bufnum = pdata->bp_bufnum;
+	u16 ring_num = pdata->ring_num;
+	enum xgene_ring_owner owner;
+	dma_addr_t dma_exp_bufs;
+	u16 ring_id, slots;
+	__le64 *exp_bufs;
+	int i, ret, size;
+	u8 cpu_bufnum;
+
+	cpu_bufnum = xgene_start_cpu_bufnum(pdata);
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		/* allocate rx descriptor ring */
+		owner = xgene_derive_ring_owner(pdata);
+		ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
+		rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
+						      RING_CFGSIZE_16KB,
+						      ring_id);
+		if (!rx_ring) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		/* allocate buffer pool for receiving packets */
+		owner = xgene_derive_ring_owner(pdata);
+		ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
+		buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
+						       RING_CFGSIZE_16KB,
+						       ring_id);
+		if (!buf_pool) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		rx_ring->nbufpool = NUM_BUFPOOL;
+		rx_ring->npagepool = NUM_NXTBUFPOOL;
+		rx_ring->irq = pdata->irqs[i];
+		buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots,
+						sizeof(struct sk_buff *),
+						GFP_KERNEL);
+		if (!buf_pool->rx_skb) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool);
+		rx_ring->buf_pool = buf_pool;
+		pdata->rx_ring[i] = rx_ring;
+
+		if ((pdata->enet_id == XGENE_ENET1 &&  pdata->rxq_cnt > 4) ||
+		    (pdata->enet_id == XGENE_ENET2 &&  pdata->rxq_cnt > 16)) {
+			break;
+		}
+
+		/* allocate next buffer pool for jumbo packets */
+		owner = xgene_derive_ring_owner(pdata);
+		ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
+		page_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
+							RING_CFGSIZE_16KB,
+							ring_id);
+		if (!page_pool) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		slots = page_pool->slots;
+		page_pool->frag_page = devm_kcalloc(dev, slots,
+						    sizeof(struct page *),
+						    GFP_KERNEL);
+		if (!page_pool->frag_page) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		page_pool->frag_dma_addr = devm_kcalloc(dev, slots,
+							sizeof(dma_addr_t),
+							GFP_KERNEL);
+		if (!page_pool->frag_dma_addr) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		page_pool->dst_ring_num = xgene_enet_dst_ring_num(page_pool);
+		rx_ring->page_pool = page_pool;
+	}
+
+	for (i = 0; i < pdata->txq_cnt; i++) {
+		/* allocate tx descriptor ring */
+		owner = xgene_derive_ring_owner(pdata);
+		ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++);
+		tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
+						      RING_CFGSIZE_16KB,
+						      ring_id);
+		if (!tx_ring) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		size = (tx_ring->slots / 2) * sizeof(__le64) * MAX_EXP_BUFFS;
+		exp_bufs = dmam_alloc_coherent(dev, size, &dma_exp_bufs,
+					       GFP_KERNEL | __GFP_ZERO);
+		if (!exp_bufs) {
+			ret = -ENOMEM;
+			goto err;
+		}
+		tx_ring->exp_bufs = exp_bufs;
+
+		pdata->tx_ring[i] = tx_ring;
+
+		if (!pdata->cq_cnt) {
+			cp_ring = pdata->rx_ring[i];
+		} else {
+			/* allocate tx completion descriptor ring */
+			ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU,
+							 cpu_bufnum++);
+			cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
+							      RING_CFGSIZE_16KB,
+							      ring_id);
+			if (!cp_ring) {
+				ret = -ENOMEM;
+				goto err;
+			}
+
+			cp_ring->irq = pdata->irqs[pdata->rxq_cnt + i];
+			cp_ring->index = i;
+		}
+
+		cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots,
+					       sizeof(struct sk_buff *),
+					       GFP_KERNEL);
+		if (!cp_ring->cp_skb) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		size = sizeof(dma_addr_t) * MAX_SKB_FRAGS;
+		cp_ring->frag_dma_addr = devm_kcalloc(dev, tx_ring->slots,
+						      size, GFP_KERNEL);
+		if (!cp_ring->frag_dma_addr) {
+			devm_kfree(dev, cp_ring->cp_skb);
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		tx_ring->cp_ring = cp_ring;
+		tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring);
+	}
+
+	if (pdata->ring_ops->coalesce)
+		pdata->ring_ops->coalesce(pdata->tx_ring[0]);
+	pdata->tx_qcnt_hi = pdata->tx_ring[0]->slots - 128;
+
+	return 0;
+
+err:
+	xgene_enet_free_desc_rings(pdata);
+	return ret;
+}
+
+static void xgene_enet_get_stats64(
+			struct net_device *ndev,
+			struct rtnl_link_stats64 *stats)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	struct xgene_enet_desc_ring *ring;
+	int i;
+
+	for (i = 0; i < pdata->txq_cnt; i++) {
+		ring = pdata->tx_ring[i];
+		if (ring) {
+			stats->tx_packets += ring->tx_packets;
+			stats->tx_bytes += ring->tx_bytes;
+			stats->tx_dropped += ring->tx_dropped;
+			stats->tx_errors += ring->tx_errors;
+		}
+	}
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		ring = pdata->rx_ring[i];
+		if (ring) {
+			stats->rx_packets += ring->rx_packets;
+			stats->rx_bytes += ring->rx_bytes;
+			stats->rx_dropped += ring->rx_dropped;
+			stats->rx_errors += ring->rx_errors +
+				ring->rx_length_errors +
+				ring->rx_crc_errors +
+				ring->rx_frame_errors +
+				ring->rx_fifo_errors;
+			stats->rx_length_errors += ring->rx_length_errors;
+			stats->rx_crc_errors += ring->rx_crc_errors;
+			stats->rx_frame_errors += ring->rx_frame_errors;
+			stats->rx_fifo_errors += ring->rx_fifo_errors;
+		}
+	}
+}
+
+static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	int ret;
+
+	ret = eth_mac_addr(ndev, addr);
+	if (ret)
+		return ret;
+	pdata->mac_ops->set_mac_addr(pdata);
+
+	return ret;
+}
+
+static int xgene_change_mtu(struct net_device *ndev, int new_mtu)
+{
+	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
+	int frame_size;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	frame_size = (new_mtu > ETH_DATA_LEN) ? (new_mtu + 18) : 0x600;
+
+	xgene_enet_close(ndev);
+	ndev->mtu = new_mtu;
+	pdata->mac_ops->set_framesize(pdata, frame_size);
+	xgene_enet_open(ndev);
+
+	return 0;
+}
+
+static const struct net_device_ops xgene_ndev_ops = {
+	.ndo_open = xgene_enet_open,
+	.ndo_stop = xgene_enet_close,
+	.ndo_start_xmit = xgene_enet_start_xmit,
+	.ndo_tx_timeout = xgene_enet_timeout,
+	.ndo_get_stats64 = xgene_enet_get_stats64,
+	.ndo_change_mtu = xgene_change_mtu,
+	.ndo_set_mac_address = xgene_enet_set_mac_address,
+};
+
+#ifdef CONFIG_ACPI
+static void xgene_get_port_id_acpi(struct device *dev,
+				  struct xgene_enet_pdata *pdata)
+{
+	acpi_status status;
+	u64 temp;
+
+	status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp);
+	if (ACPI_FAILURE(status)) {
+		pdata->port_id = 0;
+	} else {
+		pdata->port_id = temp;
+	}
+
+	return;
+}
+#endif
+
+static void xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata)
+{
+	u32 id = 0;
+
+	of_property_read_u32(dev->of_node, "port-id", &id);
+
+	pdata->port_id = id & BIT(0);
+
+	return;
+}
+
+static int xgene_get_tx_delay(struct xgene_enet_pdata *pdata)
+{
+	struct device *dev = &pdata->pdev->dev;
+	int delay, ret;
+
+	ret = device_property_read_u32(dev, "tx-delay", &delay);
+	if (ret) {
+		pdata->tx_delay = 4;
+		return 0;
+	}
+
+	if (delay < 0 || delay > 7) {
+		dev_err(dev, "Invalid tx-delay specified\n");
+		return -EINVAL;
+	}
+
+	pdata->tx_delay = delay;
+
+	return 0;
+}
+
+static int xgene_get_rx_delay(struct xgene_enet_pdata *pdata)
+{
+	struct device *dev = &pdata->pdev->dev;
+	int delay, ret;
+
+	ret = device_property_read_u32(dev, "rx-delay", &delay);
+	if (ret) {
+		pdata->rx_delay = 2;
+		return 0;
+	}
+
+	if (delay < 0 || delay > 7) {
+		dev_err(dev, "Invalid rx-delay specified\n");
+		return -EINVAL;
+	}
+
+	pdata->rx_delay = delay;
+
+	return 0;
+}
+
+static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata)
+{
+	struct platform_device *pdev = pdata->pdev;
+	int i, ret, max_irqs;
+
+	if (phy_interface_mode_is_rgmii(pdata->phy_mode))
+		max_irqs = 1;
+	else if (pdata->phy_mode == PHY_INTERFACE_MODE_SGMII)
+		max_irqs = 2;
+	else
+		max_irqs = XGENE_MAX_ENET_IRQ;
+
+	for (i = 0; i < max_irqs; i++) {
+		ret = platform_get_irq(pdev, i);
+		if (ret <= 0) {
+			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+				max_irqs = i;
+				pdata->rxq_cnt = max_irqs / 2;
+				pdata->txq_cnt = max_irqs / 2;
+				pdata->cq_cnt = max_irqs / 2;
+				break;
+			}
+			return ret ? : -ENXIO;
+		}
+		pdata->irqs[i] = ret;
+	}
+
+	return 0;
+}
+
+static void xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata)
+{
+	int ret;
+
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII)
+		return;
+
+	if (!IS_ENABLED(CONFIG_MDIO_XGENE))
+		return;
+
+	ret = xgene_enet_phy_connect(pdata->ndev);
+	if (!ret)
+		pdata->mdio_driver = true;
+}
+
+static void xgene_enet_gpiod_get(struct xgene_enet_pdata *pdata)
+{
+	struct device *dev = &pdata->pdev->dev;
+
+	pdata->sfp_gpio_en = false;
+	if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII ||
+	    (!device_property_present(dev, "sfp-gpios") &&
+	     !device_property_present(dev, "rxlos-gpios")))
+		return;
+
+	pdata->sfp_gpio_en = true;
+	pdata->sfp_rdy = gpiod_get(dev, "rxlos", GPIOD_IN);
+	if (IS_ERR(pdata->sfp_rdy))
+		pdata->sfp_rdy = gpiod_get(dev, "sfp", GPIOD_IN);
+}
+
+static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
+{
+	struct platform_device *pdev;
+	struct net_device *ndev;
+	struct device *dev;
+	struct resource *res;
+	void __iomem *base_addr;
+	u32 offset;
+	int ret = 0;
+
+	pdev = pdata->pdev;
+	dev = &pdev->dev;
+	ndev = pdata->ndev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR);
+	if (!res) {
+		dev_err(dev, "Resource enet_csr not defined\n");
+		return -ENODEV;
+	}
+	pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res));
+	if (!pdata->base_addr) {
+		dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
+		return -ENOMEM;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR);
+	if (!res) {
+		dev_err(dev, "Resource ring_csr not defined\n");
+		return -ENODEV;
+	}
+	pdata->ring_csr_addr = devm_ioremap(dev, res->start,
+							resource_size(res));
+	if (!pdata->ring_csr_addr) {
+		dev_err(dev, "Unable to retrieve ENET Ring CSR region\n");
+		return -ENOMEM;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD);
+	if (!res) {
+		dev_err(dev, "Resource ring_cmd not defined\n");
+		return -ENODEV;
+	}
+	pdata->ring_cmd_addr = devm_ioremap(dev, res->start,
+							resource_size(res));
+	if (!pdata->ring_cmd_addr) {
+		dev_err(dev, "Unable to retrieve ENET Ring command region\n");
+		return -ENOMEM;
+	}
+
+	if (dev->of_node)
+		xgene_get_port_id_dt(dev, pdata);
+#ifdef CONFIG_ACPI
+	else
+		xgene_get_port_id_acpi(dev, pdata);
+#endif
+
+	if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
+		eth_hw_addr_random(ndev);
+
+	memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
+
+	pdata->phy_mode = device_get_phy_mode(dev);
+	if (pdata->phy_mode < 0) {
+		dev_err(dev, "Unable to get phy-connection-type\n");
+		return pdata->phy_mode;
+	}
+	if (!phy_interface_mode_is_rgmii(pdata->phy_mode) &&
+	    pdata->phy_mode != PHY_INTERFACE_MODE_SGMII &&
+	    pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) {
+		dev_err(dev, "Incorrect phy-connection-type specified\n");
+		return -ENODEV;
+	}
+
+	ret = xgene_get_tx_delay(pdata);
+	if (ret)
+		return ret;
+
+	ret = xgene_get_rx_delay(pdata);
+	if (ret)
+		return ret;
+
+	ret = xgene_enet_get_irqs(pdata);
+	if (ret)
+		return ret;
+
+	xgene_enet_gpiod_get(pdata);
+
+	pdata->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(pdata->clk)) {
+		if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
+			/* Abort if the clock is defined but couldn't be
+			 * retrived. Always abort if the clock is missing on
+			 * DT system as the driver can't cope with this case.
+			 */
+			if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
+				return PTR_ERR(pdata->clk);
+			/* Firmware may have set up the clock already. */
+			dev_info(dev, "clocks have been setup already\n");
+		}
+	}
+
+	if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
+		base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET);
+	else
+		base_addr = pdata->base_addr;
+	pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET;
+	pdata->cle.base = base_addr + BLOCK_ETH_CLE_CSR_OFFSET;
+	pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET;
+	pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET;
+	if (phy_interface_mode_is_rgmii(pdata->phy_mode) ||
+	    pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) {
+		pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET;
+		pdata->mcx_stats_addr =
+			pdata->base_addr + BLOCK_ETH_STATS_OFFSET;
+		offset = (pdata->enet_id == XGENE_ENET1) ?
+			  BLOCK_ETH_MAC_CSR_OFFSET :
+			  X2_BLOCK_ETH_MAC_CSR_OFFSET;
+		pdata->mcx_mac_csr_addr = base_addr + offset;
+	} else {
+		pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET;
+		pdata->mcx_stats_addr = base_addr + BLOCK_AXG_STATS_OFFSET;
+		pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET;
+		pdata->pcs_addr = base_addr + BLOCK_PCS_OFFSET;
+	}
+	pdata->rx_buff_cnt = NUM_PKT_BUF;
+
+	return 0;
+}
+
+static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata)
+{
+	struct xgene_enet_cle *enet_cle = &pdata->cle;
+	struct xgene_enet_desc_ring *page_pool;
+	struct net_device *ndev = pdata->ndev;
+	struct xgene_enet_desc_ring *buf_pool;
+	u16 dst_ring_num, ring_id;
+	int i, ret;
+	u32 count;
+
+	ret = pdata->port_ops->reset(pdata);
+	if (ret)
+		return ret;
+
+	ret = xgene_enet_create_desc_rings(ndev);
+	if (ret) {
+		netdev_err(ndev, "Error in ring configuration\n");
+		return ret;
+	}
+
+	/* setup buffer pool */
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		buf_pool = pdata->rx_ring[i]->buf_pool;
+		xgene_enet_init_bufpool(buf_pool);
+		page_pool = pdata->rx_ring[i]->page_pool;
+		xgene_enet_init_bufpool(page_pool);
+
+		count = pdata->rx_buff_cnt;
+		ret = xgene_enet_refill_bufpool(buf_pool, count);
+		if (ret)
+			goto err;
+
+		ret = xgene_enet_refill_pagepool(page_pool, count);
+		if (ret)
+			goto err;
+
+	}
+
+	dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]);
+	buf_pool = pdata->rx_ring[0]->buf_pool;
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+		/* Initialize and Enable  PreClassifier Tree */
+		enet_cle->max_nodes = 512;
+		enet_cle->max_dbptrs = 1024;
+		enet_cle->parsers = 3;
+		enet_cle->active_parser = PARSER_ALL;
+		enet_cle->ptree.start_node = 0;
+		enet_cle->ptree.start_dbptr = 0;
+		enet_cle->jump_bytes = 8;
+		ret = pdata->cle_ops->cle_init(pdata);
+		if (ret) {
+			netdev_err(ndev, "Preclass Tree init error\n");
+			goto err;
+		}
+
+	} else {
+		dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]);
+		buf_pool = pdata->rx_ring[0]->buf_pool;
+		page_pool = pdata->rx_ring[0]->page_pool;
+		ring_id = (page_pool) ? page_pool->id : 0;
+		pdata->port_ops->cle_bypass(pdata, dst_ring_num,
+					    buf_pool->id, ring_id);
+	}
+
+	ndev->max_mtu = XGENE_ENET_MAX_MTU;
+	pdata->phy_speed = SPEED_UNKNOWN;
+	pdata->mac_ops->init(pdata);
+
+	return ret;
+
+err:
+	xgene_enet_delete_desc_rings(pdata);
+	return ret;
+}
+
+static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata)
+{
+	switch (pdata->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		pdata->mac_ops = &xgene_gmac_ops;
+		pdata->port_ops = &xgene_gport_ops;
+		pdata->rm = RM3;
+		pdata->rxq_cnt = 1;
+		pdata->txq_cnt = 1;
+		pdata->cq_cnt = 0;
+		break;
+	case PHY_INTERFACE_MODE_SGMII:
+		pdata->mac_ops = &xgene_sgmac_ops;
+		pdata->port_ops = &xgene_sgport_ops;
+		pdata->rm = RM1;
+		pdata->rxq_cnt = 1;
+		pdata->txq_cnt = 1;
+		pdata->cq_cnt = 1;
+		break;
+	default:
+		pdata->mac_ops = &xgene_xgmac_ops;
+		pdata->port_ops = &xgene_xgport_ops;
+		pdata->cle_ops = &xgene_cle3in_ops;
+		pdata->rm = RM0;
+		if (!pdata->rxq_cnt) {
+			pdata->rxq_cnt = XGENE_NUM_RX_RING;
+			pdata->txq_cnt = XGENE_NUM_TX_RING;
+			pdata->cq_cnt = XGENE_NUM_TXC_RING;
+		}
+		break;
+	}
+
+	if (pdata->enet_id == XGENE_ENET1) {
+		switch (pdata->port_id) {
+		case 0:
+			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+				pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
+				pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
+				pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
+				pdata->ring_num = START_RING_NUM_0;
+			} else {
+				pdata->cpu_bufnum = START_CPU_BUFNUM_0;
+				pdata->eth_bufnum = START_ETH_BUFNUM_0;
+				pdata->bp_bufnum = START_BP_BUFNUM_0;
+				pdata->ring_num = START_RING_NUM_0;
+			}
+			break;
+		case 1:
+			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+				pdata->cpu_bufnum = XG_START_CPU_BUFNUM_1;
+				pdata->eth_bufnum = XG_START_ETH_BUFNUM_1;
+				pdata->bp_bufnum = XG_START_BP_BUFNUM_1;
+				pdata->ring_num = XG_START_RING_NUM_1;
+			} else {
+				pdata->cpu_bufnum = START_CPU_BUFNUM_1;
+				pdata->eth_bufnum = START_ETH_BUFNUM_1;
+				pdata->bp_bufnum = START_BP_BUFNUM_1;
+				pdata->ring_num = START_RING_NUM_1;
+			}
+			break;
+		default:
+			break;
+		}
+		pdata->ring_ops = &xgene_ring1_ops;
+	} else {
+		switch (pdata->port_id) {
+		case 0:
+			pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
+			pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
+			pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
+			pdata->ring_num = X2_START_RING_NUM_0;
+			break;
+		case 1:
+			pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1;
+			pdata->eth_bufnum = X2_START_ETH_BUFNUM_1;
+			pdata->bp_bufnum = X2_START_BP_BUFNUM_1;
+			pdata->ring_num = X2_START_RING_NUM_1;
+			break;
+		default:
+			break;
+		}
+		pdata->rm = RM0;
+		pdata->ring_ops = &xgene_ring2_ops;
+	}
+}
+
+static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata)
+{
+	struct napi_struct *napi;
+	int i;
+
+	for (i = 0; i < pdata->rxq_cnt; i++) {
+		napi = &pdata->rx_ring[i]->napi;
+		netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
+			       NAPI_POLL_WEIGHT);
+	}
+
+	for (i = 0; i < pdata->cq_cnt; i++) {
+		napi = &pdata->tx_ring[i]->cp_ring->napi;
+		netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
+			       NAPI_POLL_WEIGHT);
+	}
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_enet_acpi_match[] = {
+	{ "APMC0D05", XGENE_ENET1},
+	{ "APMC0D30", XGENE_ENET1},
+	{ "APMC0D31", XGENE_ENET1},
+	{ "APMC0D3F", XGENE_ENET1},
+	{ "APMC0D26", XGENE_ENET2},
+	{ "APMC0D25", XGENE_ENET2},
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match);
+#endif
+
+static const struct of_device_id xgene_enet_of_match[] = {
+	{.compatible = "apm,xgene-enet",    .data = (void *)XGENE_ENET1},
+	{.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1},
+	{.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1},
+	{.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2},
+	{.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, xgene_enet_of_match);
+
+static int xgene_enet_probe(struct platform_device *pdev)
+{
+	struct net_device *ndev;
+	struct xgene_enet_pdata *pdata;
+	struct device *dev = &pdev->dev;
+	void (*link_state)(struct work_struct *);
+	const struct of_device_id *of_id;
+	int ret;
+
+	ndev = alloc_etherdev_mqs(sizeof(struct xgene_enet_pdata),
+				  XGENE_NUM_TX_RING, XGENE_NUM_RX_RING);
+	if (!ndev)
+		return -ENOMEM;
+
+	pdata = netdev_priv(ndev);
+
+	pdata->pdev = pdev;
+	pdata->ndev = ndev;
+	SET_NETDEV_DEV(ndev, dev);
+	platform_set_drvdata(pdev, pdata);
+	ndev->netdev_ops = &xgene_ndev_ops;
+	xgene_enet_set_ethtool_ops(ndev);
+	ndev->features |= NETIF_F_IP_CSUM |
+			  NETIF_F_GSO |
+			  NETIF_F_GRO |
+			  NETIF_F_SG;
+
+	of_id = of_match_device(xgene_enet_of_match, &pdev->dev);
+	if (of_id) {
+		pdata->enet_id = (enum xgene_enet_id)of_id->data;
+	}
+#ifdef CONFIG_ACPI
+	else {
+		const struct acpi_device_id *acpi_id;
+
+		acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev);
+		if (acpi_id)
+			pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data;
+	}
+#endif
+	if (!pdata->enet_id) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	ret = xgene_enet_get_resources(pdata);
+	if (ret)
+		goto err;
+
+	xgene_enet_setup_ops(pdata);
+	spin_lock_init(&pdata->mac_lock);
+
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+		ndev->features |= NETIF_F_TSO | NETIF_F_RXCSUM;
+		spin_lock_init(&pdata->mss_lock);
+	}
+	ndev->hw_features = ndev->features;
+
+	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+	if (ret) {
+		netdev_err(ndev, "No usable DMA configuration\n");
+		goto err;
+	}
+
+	xgene_enet_check_phy_handle(pdata);
+
+	ret = xgene_enet_init_hw(pdata);
+	if (ret)
+		goto err2;
+
+	link_state = pdata->mac_ops->link_state;
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+		INIT_DELAYED_WORK(&pdata->link_work, link_state);
+	} else if (!pdata->mdio_driver) {
+		if (phy_interface_mode_is_rgmii(pdata->phy_mode))
+			ret = xgene_enet_mdio_config(pdata);
+		else
+			INIT_DELAYED_WORK(&pdata->link_work, link_state);
+
+		if (ret)
+			goto err1;
+	}
+
+	spin_lock_init(&pdata->stats_lock);
+	ret = xgene_extd_stats_init(pdata);
+	if (ret)
+		goto err1;
+
+	xgene_enet_napi_add(pdata);
+	ret = register_netdev(ndev);
+	if (ret) {
+		netdev_err(ndev, "Failed to register netdev\n");
+		goto err1;
+	}
+
+	return 0;
+
+err1:
+	/*
+	 * If necessary, free_netdev() will call netif_napi_del() and undo
+	 * the effects of xgene_enet_napi_add()'s calls to netif_napi_add().
+	 */
+
+	xgene_enet_delete_desc_rings(pdata);
+
+err2:
+	if (pdata->mdio_driver)
+		xgene_enet_phy_disconnect(pdata);
+	else if (phy_interface_mode_is_rgmii(pdata->phy_mode))
+		xgene_enet_mdio_remove(pdata);
+err:
+	free_netdev(ndev);
+	return ret;
+}
+
+static int xgene_enet_remove(struct platform_device *pdev)
+{
+	struct xgene_enet_pdata *pdata;
+	struct net_device *ndev;
+
+	pdata = platform_get_drvdata(pdev);
+	ndev = pdata->ndev;
+
+	rtnl_lock();
+	if (netif_running(ndev))
+		dev_close(ndev);
+	rtnl_unlock();
+
+	if (pdata->mdio_driver)
+		xgene_enet_phy_disconnect(pdata);
+	else if (phy_interface_mode_is_rgmii(pdata->phy_mode))
+		xgene_enet_mdio_remove(pdata);
+
+	unregister_netdev(ndev);
+	xgene_enet_delete_desc_rings(pdata);
+	pdata->port_ops->shutdown(pdata);
+	free_netdev(ndev);
+
+	return 0;
+}
+
+static void xgene_enet_shutdown(struct platform_device *pdev)
+{
+	struct xgene_enet_pdata *pdata;
+
+	pdata = platform_get_drvdata(pdev);
+	if (!pdata)
+		return;
+
+	if (!pdata->ndev)
+		return;
+
+	xgene_enet_remove(pdev);
+}
+
+static struct platform_driver xgene_enet_driver = {
+	.driver = {
+		   .name = "xgene-enet",
+		   .of_match_table = of_match_ptr(xgene_enet_of_match),
+		   .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match),
+	},
+	.probe = xgene_enet_probe,
+	.remove = xgene_enet_remove,
+	.shutdown = xgene_enet_shutdown,
+};
+
+module_platform_driver(xgene_enet_driver);
+
+MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver");
+MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
+MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>");
+MODULE_LICENSE("GPL");