drivers/net/ethernet/stmicro/stmmac/enh_desc.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*******************************************************************************
   This contains the functions to handle the enhanced descriptors.

   Copyright (C) 2007-2014  STMicroelectronics Ltd


   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 *******************************************************************************/

 #include <linux/stmmac.h>
 #include "common.h"
 #include "descs_com.h"

 static int enh_desc_get_tx_status(void *data, struct stmmac_extra_stats *x,
 				  struct dma_desc *p, void __iomem *ioaddr)
 {
 	struct net_device_stats *stats = (struct net_device_stats *)data;
 	unsigned int tdes0 = le32_to_cpu(p->des0);
 	int ret = tx_done;

 	/* Get tx owner first */
 	if (unlikely(tdes0 & ETDES0_OWN))
 		return tx_dma_own;

 	/* Verify tx error by looking at the last segment. */
 	if (likely(!(tdes0 & ETDES0_LAST_SEGMENT)))
 		return tx_not_ls;

 	if (unlikely(tdes0 & ETDES0_ERROR_SUMMARY)) {
 		if (unlikely(tdes0 & ETDES0_JABBER_TIMEOUT))
 			x->tx_jabber++;

 		if (unlikely(tdes0 & ETDES0_FRAME_FLUSHED)) {
 			x->tx_frame_flushed++;
 			dwmac_dma_flush_tx_fifo(ioaddr);
 		}

 		if (unlikely(tdes0 & ETDES0_LOSS_CARRIER)) {
 			x->tx_losscarrier++;
 			stats->tx_carrier_errors++;
 		}
 		if (unlikely(tdes0 & ETDES0_NO_CARRIER)) {
 			x->tx_carrier++;
 			stats->tx_carrier_errors++;
 		}
 		if (unlikely((tdes0 & ETDES0_LATE_COLLISION) ||
 			     (tdes0 & ETDES0_EXCESSIVE_COLLISIONS)))
 			stats->collisions +=
 				(tdes0 & ETDES0_COLLISION_COUNT_MASK) >> 3;

 		if (unlikely(tdes0 & ETDES0_EXCESSIVE_DEFERRAL))
 			x->tx_deferred++;

 		if (unlikely(tdes0 & ETDES0_UNDERFLOW_ERROR)) {
 			dwmac_dma_flush_tx_fifo(ioaddr);
 			x->tx_underflow++;
 		}

 		if (unlikely(tdes0 & ETDES0_IP_HEADER_ERROR))
 			x->tx_ip_header_error++;

 		if (unlikely(tdes0 & ETDES0_PAYLOAD_ERROR)) {
 			x->tx_payload_error++;
 			dwmac_dma_flush_tx_fifo(ioaddr);
 		}

 		ret = tx_err;
 	}

 	if (unlikely(tdes0 & ETDES0_DEFERRED))
 		x->tx_deferred++;

 #ifdef STMMAC_VLAN_TAG_USED
 	if (tdes0 & ETDES0_VLAN_FRAME)
 		x->tx_vlan++;
 #endif

 	return ret;
 }

 static int enh_desc_get_tx_len(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des1) & ETDES1_BUFFER1_SIZE_MASK);
 }

 static int enh_desc_coe_rdes0(int ipc_err, int type, int payload_err)
 {
 	int ret = good_frame;
 	u32 status = (type << 2 | ipc_err << 1 | payload_err) & 0x7;

 	/* bits 5 7 0 | Frame status
 	 * ----------------------------------------------------------
 	 *      0 0 0 | IEEE 802.3 Type frame (length < 1536 octects)
 	 *      1 0 0 | IPv4/6 No CSUM errorS.
 	 *      1 0 1 | IPv4/6 CSUM PAYLOAD error
 	 *      1 1 0 | IPv4/6 CSUM IP HR error
 	 *      1 1 1 | IPv4/6 IP PAYLOAD AND HEADER errorS
 	 *      0 0 1 | IPv4/6 unsupported IP PAYLOAD
 	 *      0 1 1 | COE bypassed.. no IPv4/6 frame
 	 *      0 1 0 | Reserved.
 	 */
 	if (status == 0x0)
 		ret = llc_snap;
 	else if (status == 0x4)
 		ret = good_frame;
 	else if (status == 0x5)
 		ret = csum_none;
 	else if (status == 0x6)
 		ret = csum_none;
 	else if (status == 0x7)
 		ret = csum_none;
 	else if (status == 0x1)
 		ret = discard_frame;
 	else if (status == 0x3)
 		ret = discard_frame;
 	return ret;
 }

 static void enh_desc_get_ext_status(void *data, struct stmmac_extra_stats *x,
 				    struct dma_extended_desc *p)
 {
 	unsigned int rdes0 = le32_to_cpu(p->basic.des0);
 	unsigned int rdes4 = le32_to_cpu(p->des4);

 	if (unlikely(rdes0 & ERDES0_RX_MAC_ADDR)) {
 		int message_type = (rdes4 & ERDES4_MSG_TYPE_MASK) >> 8;

 		if (rdes4 & ERDES4_IP_HDR_ERR)
 			x->ip_hdr_err++;
 		if (rdes4 & ERDES4_IP_PAYLOAD_ERR)
 			x->ip_payload_err++;
 		if (rdes4 & ERDES4_IP_CSUM_BYPASSED)
 			x->ip_csum_bypassed++;
 		if (rdes4 & ERDES4_IPV4_PKT_RCVD)
 			x->ipv4_pkt_rcvd++;
 		if (rdes4 & ERDES4_IPV6_PKT_RCVD)
 			x->ipv6_pkt_rcvd++;

 		if (message_type == RDES_EXT_NO_PTP)
 			x->no_ptp_rx_msg_type_ext++;
 		else if (message_type == RDES_EXT_SYNC)
 			x->ptp_rx_msg_type_sync++;
 		else if (message_type == RDES_EXT_FOLLOW_UP)
 			x->ptp_rx_msg_type_follow_up++;
 		else if (message_type == RDES_EXT_DELAY_REQ)
 			x->ptp_rx_msg_type_delay_req++;
 		else if (message_type == RDES_EXT_DELAY_RESP)
 			x->ptp_rx_msg_type_delay_resp++;
 		else if (message_type == RDES_EXT_PDELAY_REQ)
 			x->ptp_rx_msg_type_pdelay_req++;
 		else if (message_type == RDES_EXT_PDELAY_RESP)
 			x->ptp_rx_msg_type_pdelay_resp++;
 		else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
 			x->ptp_rx_msg_type_pdelay_follow_up++;
 		else if (message_type == RDES_PTP_ANNOUNCE)
 			x->ptp_rx_msg_type_announce++;
 		else if (message_type == RDES_PTP_MANAGEMENT)
 			x->ptp_rx_msg_type_management++;
 		else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
 			x->ptp_rx_msg_pkt_reserved_type++;

 		if (rdes4 & ERDES4_PTP_FRAME_TYPE)
 			x->ptp_frame_type++;
 		if (rdes4 & ERDES4_PTP_VER)
 			x->ptp_ver++;
 		if (rdes4 & ERDES4_TIMESTAMP_DROPPED)
 			x->timestamp_dropped++;
 		if (rdes4 & ERDES4_AV_PKT_RCVD)
 			x->av_pkt_rcvd++;
 		if (rdes4 & ERDES4_AV_TAGGED_PKT_RCVD)
 			x->av_tagged_pkt_rcvd++;
 		if ((rdes4 & ERDES4_VLAN_TAG_PRI_VAL_MASK) >> 18)
 			x->vlan_tag_priority_val++;
 		if (rdes4 & ERDES4_L3_FILTER_MATCH)
 			x->l3_filter_match++;
 		if (rdes4 & ERDES4_L4_FILTER_MATCH)
 			x->l4_filter_match++;
 		if ((rdes4 & ERDES4_L3_L4_FILT_NO_MATCH_MASK) >> 26)
 			x->l3_l4_filter_no_match++;
 	}
 }

 static int enh_desc_get_rx_status(void *data, struct stmmac_extra_stats *x,
 				  struct dma_desc *p)
 {
 	struct net_device_stats *stats = (struct net_device_stats *)data;
 	unsigned int rdes0 = le32_to_cpu(p->des0);
 	int ret = good_frame;

 	if (unlikely(rdes0 & RDES0_OWN))
 		return dma_own;

 	if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
 		stats->rx_length_errors++;
 		return discard_frame;
 	}

 	if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
 		if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR)) {
 			x->rx_desc++;
 			stats->rx_length_errors++;
 		}
 		if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
 			x->rx_gmac_overflow++;

 		if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
 			pr_err("\tIPC Csum Error/Giant frame\n");

 		if (unlikely(rdes0 & RDES0_COLLISION))
 			stats->collisions++;
 		if (unlikely(rdes0 & RDES0_RECEIVE_WATCHDOG))
 			x->rx_watchdog++;

 		if (unlikely(rdes0 & RDES0_MII_ERROR))	/* GMII */
 			x->rx_mii++;

 		if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
 			x->rx_crc_errors++;
 			stats->rx_crc_errors++;
 		}
 		ret = discard_frame;
 	}

 	/* After a payload csum error, the ES bit is set.
 	 * It doesn't match with the information reported into the databook.
 	 * At any rate, we need to understand if the CSUM hw computation is ok
 	 * and report this info to the upper layers. */
 	if (likely(ret == good_frame))
 		ret = enh_desc_coe_rdes0(!!(rdes0 & RDES0_IPC_CSUM_ERROR),
 					 !!(rdes0 & RDES0_FRAME_TYPE),
 					 !!(rdes0 & ERDES0_RX_MAC_ADDR));

 	if (unlikely(rdes0 & RDES0_DRIBBLING))
 		x->dribbling_bit++;

 	if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL)) {
 		x->sa_rx_filter_fail++;
 		ret = discard_frame;
 	}
 	if (unlikely(rdes0 & RDES0_DA_FILTER_FAIL)) {
 		x->da_rx_filter_fail++;
 		ret = discard_frame;
 	}
 	if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
 		x->rx_length++;
 		ret = discard_frame;
 	}
 #ifdef STMMAC_VLAN_TAG_USED
 	if (rdes0 & RDES0_VLAN_TAG)
 		x->rx_vlan++;
 #endif

 	return ret;
 }

 static void enh_desc_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
 				  int mode, int end, int bfsize)
 {
 	int bfsize1;

 	p->des0 |= cpu_to_le32(RDES0_OWN);

 	bfsize1 = min(bfsize, BUF_SIZE_8KiB);
 	p->des1 |= cpu_to_le32(bfsize1 & ERDES1_BUFFER1_SIZE_MASK);

 	if (mode == STMMAC_CHAIN_MODE)
 		ehn_desc_rx_set_on_chain(p);
 	else
 		ehn_desc_rx_set_on_ring(p, end, bfsize);

 	if (disable_rx_ic)
 		p->des1 |= cpu_to_le32(ERDES1_DISABLE_IC);
 }

 static void enh_desc_init_tx_desc(struct dma_desc *p, int mode, int end)
 {
 	p->des0 &= cpu_to_le32(~ETDES0_OWN);
 	if (mode == STMMAC_CHAIN_MODE)
 		enh_desc_end_tx_desc_on_chain(p);
 	else
 		enh_desc_end_tx_desc_on_ring(p, end);
 }

 static int enh_desc_get_tx_owner(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des0) & ETDES0_OWN) >> 31;
 }

 static void enh_desc_set_tx_owner(struct dma_desc *p)
 {
 	p->des0 |= cpu_to_le32(ETDES0_OWN);
 }

 static void enh_desc_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 {
 	p->des0 |= cpu_to_le32(RDES0_OWN);
 }

 static int enh_desc_get_tx_ls(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des0) & ETDES0_LAST_SEGMENT) >> 29;
 }

 static void enh_desc_release_tx_desc(struct dma_desc *p, int mode)
 {
 	int ter = (le32_to_cpu(p->des0) & ETDES0_END_RING) >> 21;

 	memset(p, 0, offsetof(struct dma_desc, des2));
 	if (mode == STMMAC_CHAIN_MODE)
 		enh_desc_end_tx_desc_on_chain(p);
 	else
 		enh_desc_end_tx_desc_on_ring(p, ter);
 }

 static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 				     bool csum_flag, int mode, bool tx_own,
 				     bool ls, unsigned int tot_pkt_len)
 {
 	unsigned int tdes0 = le32_to_cpu(p->des0);

 	if (mode == STMMAC_CHAIN_MODE)
 		enh_set_tx_desc_len_on_chain(p, len);
 	else
 		enh_set_tx_desc_len_on_ring(p, len);

 	if (is_fs)
 		tdes0 |= ETDES0_FIRST_SEGMENT;
 	else
 		tdes0 &= ~ETDES0_FIRST_SEGMENT;

 	if (likely(csum_flag))
 		tdes0 |= (TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);
 	else
 		tdes0 &= ~(TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);

 	if (ls)
 		tdes0 |= ETDES0_LAST_SEGMENT;

 	/* Finally set the OWN bit. Later the DMA will start! */
 	if (tx_own)
 		tdes0 |= ETDES0_OWN;

 	if (is_fs && tx_own)
 		/* When the own bit, for the first frame, has to be set, all
 		 * descriptors for the same frame has to be set before, to
 		 * avoid race condition.
 		 */
 		dma_wmb();

 	p->des0 = cpu_to_le32(tdes0);
 }

 static void enh_desc_set_tx_ic(struct dma_desc *p)
 {
 	p->des0 |= cpu_to_le32(ETDES0_INTERRUPT);
 }

 static int enh_desc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
 {
 	unsigned int csum = 0;
 	/* The type-1 checksum offload engines append the checksum at
 	 * the end of frame and the two bytes of checksum are added in
 	 * the length.
 	 * Adjust for that in the framelen for type-1 checksum offload
 	 * engines.
 	 */
 	if (rx_coe_type == STMMAC_RX_COE_TYPE1)
 		csum = 2;

 	return (((le32_to_cpu(p->des0) & RDES0_FRAME_LEN_MASK)
 				>> RDES0_FRAME_LEN_SHIFT) - csum);
 }

 static void enh_desc_enable_tx_timestamp(struct dma_desc *p)
 {
 	p->des0 |= cpu_to_le32(ETDES0_TIME_STAMP_ENABLE);
 }

 static int enh_desc_get_tx_timestamp_status(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des0) & ETDES0_TIME_STAMP_STATUS) >> 17;
 }

 static void enh_desc_get_timestamp(void *desc, u32 ats, u64 *ts)
 {
 	u64 ns;

 	if (ats) {
 		struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
 		ns = le32_to_cpu(p->des6);
 		/* convert high/sec time stamp value to nanosecond */
 		ns += le32_to_cpu(p->des7) * 1000000000ULL;
 	} else {
 		struct dma_desc *p = (struct dma_desc *)desc;
 		ns = le32_to_cpu(p->des2);
 		ns += le32_to_cpu(p->des3) * 1000000000ULL;
 	}

 	*ts = ns;
 }

 static int enh_desc_get_rx_timestamp_status(void *desc, void *next_desc,
 					    u32 ats)
 {
 	if (ats) {
 		struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
 		return (le32_to_cpu(p->basic.des0) & RDES0_IPC_CSUM_ERROR) >> 7;
 	} else {
 		struct dma_desc *p = (struct dma_desc *)desc;
 		if ((le32_to_cpu(p->des2) == 0xffffffff) &&
 		    (le32_to_cpu(p->des3) == 0xffffffff))
 			/* timestamp is corrupted, hence don't store it */
 			return 0;
 		else
 			return 1;
 	}
 }

 static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
 {
 	struct dma_extended_desc *ep = (struct dma_extended_desc *)head;
 	int i;

 	pr_info("Extended %s descriptor ring:\n", rx ? "RX" : "TX");

 	for (i = 0; i < size; i++) {
 		u64 x;

 		x = *(u64 *)ep;
 		pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 			i, (unsigned int)virt_to_phys(ep),
 			(unsigned int)x, (unsigned int)(x >> 32),
 			ep->basic.des2, ep->basic.des3);
 		ep++;
 	}
 	pr_info("\n");
 }

 static void enh_desc_get_addr(struct dma_desc *p, unsigned int *addr)
 {
 	*addr = le32_to_cpu(p->des2);
 }

 static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
 {
 	p->des2 = cpu_to_le32(addr);
 }

 static void enh_desc_clear(struct dma_desc *p)
 {
 	p->des2 = 0;
 }

 const struct stmmac_desc_ops enh_desc_ops = {
 	.tx_status = enh_desc_get_tx_status,
 	.rx_status = enh_desc_get_rx_status,
 	.get_tx_len = enh_desc_get_tx_len,
 	.init_rx_desc = enh_desc_init_rx_desc,
 	.init_tx_desc = enh_desc_init_tx_desc,
 	.get_tx_owner = enh_desc_get_tx_owner,
 	.release_tx_desc = enh_desc_release_tx_desc,
 	.prepare_tx_desc = enh_desc_prepare_tx_desc,
 	.set_tx_ic = enh_desc_set_tx_ic,
 	.get_tx_ls = enh_desc_get_tx_ls,
 	.set_tx_owner = enh_desc_set_tx_owner,
 	.set_rx_owner = enh_desc_set_rx_owner,
 	.get_rx_frame_len = enh_desc_get_rx_frame_len,
 	.rx_extended_status = enh_desc_get_ext_status,
 	.enable_tx_timestamp = enh_desc_enable_tx_timestamp,
 	.get_tx_timestamp_status = enh_desc_get_tx_timestamp_status,
 	.get_timestamp = enh_desc_get_timestamp,
 	.get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
 	.display_ring = enh_desc_display_ring,
 	.get_addr = enh_desc_get_addr,
 	.set_addr = enh_desc_set_addr,
 	.clear = enh_desc_clear,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/*******************************************************************************
	This contains the functions to handle the enhanced descriptors.

	Copyright (C) 2007-2014 STMicroelectronics Ltd


	Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
	*******************************************************************************/

	#include <linux/stmmac.h>
	#include "common.h"
	#include "descs_com.h"

	static int enh_desc_get_tx_status(void data, struct stmmac_extra_stats x,
	struct dma_desc p, void __iomem ioaddr)
	{
	struct net_device_stats stats = (struct net_device_stats )data;
	unsigned int tdes0 = le32_to_cpu(p->des0);
	int ret = tx_done;

	/* Get tx owner first */
	if (unlikely(tdes0 & ETDES0_OWN))
	return tx_dma_own;

	/* Verify tx error by looking at the last segment. */
	if (likely(!(tdes0 & ETDES0_LAST_SEGMENT)))
	return tx_not_ls;

	if (unlikely(tdes0 & ETDES0_ERROR_SUMMARY)) {
	if (unlikely(tdes0 & ETDES0_JABBER_TIMEOUT))
	x->tx_jabber++;

	if (unlikely(tdes0 & ETDES0_FRAME_FLUSHED)) {
	x->tx_frame_flushed++;
	dwmac_dma_flush_tx_fifo(ioaddr);
	}

	if (unlikely(tdes0 & ETDES0_LOSS_CARRIER)) {
	x->tx_losscarrier++;
	stats->tx_carrier_errors++;
	}
	if (unlikely(tdes0 & ETDES0_NO_CARRIER)) {
	x->tx_carrier++;
	stats->tx_carrier_errors++;
	}
	if (unlikely((tdes0 & ETDES0_LATE_COLLISION) \|\|
	(tdes0 & ETDES0_EXCESSIVE_COLLISIONS)))
	stats->collisions +=
	(tdes0 & ETDES0_COLLISION_COUNT_MASK) >> 3;

	if (unlikely(tdes0 & ETDES0_EXCESSIVE_DEFERRAL))
	x->tx_deferred++;

	if (unlikely(tdes0 & ETDES0_UNDERFLOW_ERROR)) {
	dwmac_dma_flush_tx_fifo(ioaddr);
	x->tx_underflow++;
	}

	if (unlikely(tdes0 & ETDES0_IP_HEADER_ERROR))
	x->tx_ip_header_error++;

	if (unlikely(tdes0 & ETDES0_PAYLOAD_ERROR)) {
	x->tx_payload_error++;
	dwmac_dma_flush_tx_fifo(ioaddr);
	}

	ret = tx_err;
	}

	if (unlikely(tdes0 & ETDES0_DEFERRED))
	x->tx_deferred++;

	#ifdef STMMAC_VLAN_TAG_USED
	if (tdes0 & ETDES0_VLAN_FRAME)
	x->tx_vlan++;
	#endif

	return ret;
	}

	static int enh_desc_get_tx_len(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des1) & ETDES1_BUFFER1_SIZE_MASK);
	}

	static int enh_desc_coe_rdes0(int ipc_err, int type, int payload_err)
	{
	int ret = good_frame;
	u32 status = (type << 2 \| ipc_err << 1 \| payload_err) & 0x7;

	/* bits 5 7 0 \| Frame status
	* ----------------------------------------------------------
	* 0 0 0 \| IEEE 802.3 Type frame (length < 1536 octects)
	* 1 0 0 \| IPv4/6 No CSUM errorS.
	* 1 0 1 \| IPv4/6 CSUM PAYLOAD error
	* 1 1 0 \| IPv4/6 CSUM IP HR error
	* 1 1 1 \| IPv4/6 IP PAYLOAD AND HEADER errorS
	* 0 0 1 \| IPv4/6 unsupported IP PAYLOAD
	* 0 1 1 \| COE bypassed.. no IPv4/6 frame
	* 0 1 0 \| Reserved.
	*/
	if (status == 0x0)
	ret = llc_snap;
	else if (status == 0x4)
	ret = good_frame;
	else if (status == 0x5)
	ret = csum_none;
	else if (status == 0x6)
	ret = csum_none;
	else if (status == 0x7)
	ret = csum_none;
	else if (status == 0x1)
	ret = discard_frame;
	else if (status == 0x3)
	ret = discard_frame;
	return ret;
	}

	static void enh_desc_get_ext_status(void data, struct stmmac_extra_stats x,
	struct dma_extended_desc *p)
	{
	unsigned int rdes0 = le32_to_cpu(p->basic.des0);
	unsigned int rdes4 = le32_to_cpu(p->des4);

	if (unlikely(rdes0 & ERDES0_RX_MAC_ADDR)) {
	int message_type = (rdes4 & ERDES4_MSG_TYPE_MASK) >> 8;

	if (rdes4 & ERDES4_IP_HDR_ERR)
	x->ip_hdr_err++;
	if (rdes4 & ERDES4_IP_PAYLOAD_ERR)
	x->ip_payload_err++;
	if (rdes4 & ERDES4_IP_CSUM_BYPASSED)
	x->ip_csum_bypassed++;
	if (rdes4 & ERDES4_IPV4_PKT_RCVD)
	x->ipv4_pkt_rcvd++;
	if (rdes4 & ERDES4_IPV6_PKT_RCVD)
	x->ipv6_pkt_rcvd++;

	if (message_type == RDES_EXT_NO_PTP)
	x->no_ptp_rx_msg_type_ext++;
	else if (message_type == RDES_EXT_SYNC)
	x->ptp_rx_msg_type_sync++;
	else if (message_type == RDES_EXT_FOLLOW_UP)
	x->ptp_rx_msg_type_follow_up++;
	else if (message_type == RDES_EXT_DELAY_REQ)
	x->ptp_rx_msg_type_delay_req++;
	else if (message_type == RDES_EXT_DELAY_RESP)
	x->ptp_rx_msg_type_delay_resp++;
	else if (message_type == RDES_EXT_PDELAY_REQ)
	x->ptp_rx_msg_type_pdelay_req++;
	else if (message_type == RDES_EXT_PDELAY_RESP)
	x->ptp_rx_msg_type_pdelay_resp++;
	else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
	x->ptp_rx_msg_type_pdelay_follow_up++;
	else if (message_type == RDES_PTP_ANNOUNCE)
	x->ptp_rx_msg_type_announce++;
	else if (message_type == RDES_PTP_MANAGEMENT)
	x->ptp_rx_msg_type_management++;
	else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
	x->ptp_rx_msg_pkt_reserved_type++;

	if (rdes4 & ERDES4_PTP_FRAME_TYPE)
	x->ptp_frame_type++;
	if (rdes4 & ERDES4_PTP_VER)
	x->ptp_ver++;
	if (rdes4 & ERDES4_TIMESTAMP_DROPPED)
	x->timestamp_dropped++;
	if (rdes4 & ERDES4_AV_PKT_RCVD)
	x->av_pkt_rcvd++;
	if (rdes4 & ERDES4_AV_TAGGED_PKT_RCVD)
	x->av_tagged_pkt_rcvd++;
	if ((rdes4 & ERDES4_VLAN_TAG_PRI_VAL_MASK) >> 18)
	x->vlan_tag_priority_val++;
	if (rdes4 & ERDES4_L3_FILTER_MATCH)
	x->l3_filter_match++;
	if (rdes4 & ERDES4_L4_FILTER_MATCH)
	x->l4_filter_match++;
	if ((rdes4 & ERDES4_L3_L4_FILT_NO_MATCH_MASK) >> 26)
	x->l3_l4_filter_no_match++;
	}
	}

	static int enh_desc_get_rx_status(void data, struct stmmac_extra_stats x,
	struct dma_desc *p)
	{
	struct net_device_stats stats = (struct net_device_stats )data;
	unsigned int rdes0 = le32_to_cpu(p->des0);
	int ret = good_frame;

	if (unlikely(rdes0 & RDES0_OWN))
	return dma_own;

	if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
	stats->rx_length_errors++;
	return discard_frame;
	}

	if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
	if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR)) {
	x->rx_desc++;
	stats->rx_length_errors++;
	}
	if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
	x->rx_gmac_overflow++;

	if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
	pr_err("\tIPC Csum Error/Giant frame\n");

	if (unlikely(rdes0 & RDES0_COLLISION))
	stats->collisions++;
	if (unlikely(rdes0 & RDES0_RECEIVE_WATCHDOG))
	x->rx_watchdog++;

	if (unlikely(rdes0 & RDES0_MII_ERROR)) /* GMII */
	x->rx_mii++;

	if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
	x->rx_crc_errors++;
	stats->rx_crc_errors++;
	}
	ret = discard_frame;
	}

	/* After a payload csum error, the ES bit is set.
	* It doesn't match with the information reported into the databook.
	* At any rate, we need to understand if the CSUM hw computation is ok
	* and report this info to the upper layers. */
	if (likely(ret == good_frame))
	ret = enh_desc_coe_rdes0(!!(rdes0 & RDES0_IPC_CSUM_ERROR),
	!!(rdes0 & RDES0_FRAME_TYPE),
	!!(rdes0 & ERDES0_RX_MAC_ADDR));

	if (unlikely(rdes0 & RDES0_DRIBBLING))
	x->dribbling_bit++;

	if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL)) {
	x->sa_rx_filter_fail++;
	ret = discard_frame;
	}
	if (unlikely(rdes0 & RDES0_DA_FILTER_FAIL)) {
	x->da_rx_filter_fail++;
	ret = discard_frame;
	}
	if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
	x->rx_length++;
	ret = discard_frame;
	}
	#ifdef STMMAC_VLAN_TAG_USED
	if (rdes0 & RDES0_VLAN_TAG)
	x->rx_vlan++;
	#endif

	return ret;
	}

	static void enh_desc_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
	int mode, int end, int bfsize)
	{
	int bfsize1;

	p->des0 \|= cpu_to_le32(RDES0_OWN);

	bfsize1 = min(bfsize, BUF_SIZE_8KiB);
	p->des1 \|= cpu_to_le32(bfsize1 & ERDES1_BUFFER1_SIZE_MASK);

	if (mode == STMMAC_CHAIN_MODE)
	ehn_desc_rx_set_on_chain(p);
	else
	ehn_desc_rx_set_on_ring(p, end, bfsize);

	if (disable_rx_ic)
	p->des1 \|= cpu_to_le32(ERDES1_DISABLE_IC);
	}

	static void enh_desc_init_tx_desc(struct dma_desc *p, int mode, int end)
	{
	p->des0 &= cpu_to_le32(~ETDES0_OWN);
	if (mode == STMMAC_CHAIN_MODE)
	enh_desc_end_tx_desc_on_chain(p);
	else
	enh_desc_end_tx_desc_on_ring(p, end);
	}

	static int enh_desc_get_tx_owner(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des0) & ETDES0_OWN) >> 31;
	}

	static void enh_desc_set_tx_owner(struct dma_desc *p)
	{
	p->des0 \|= cpu_to_le32(ETDES0_OWN);
	}

	static void enh_desc_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
	{
	p->des0 \|= cpu_to_le32(RDES0_OWN);
	}

	static int enh_desc_get_tx_ls(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des0) & ETDES0_LAST_SEGMENT) >> 29;
	}

	static void enh_desc_release_tx_desc(struct dma_desc *p, int mode)
	{
	int ter = (le32_to_cpu(p->des0) & ETDES0_END_RING) >> 21;

	memset(p, 0, offsetof(struct dma_desc, des2));
	if (mode == STMMAC_CHAIN_MODE)
	enh_desc_end_tx_desc_on_chain(p);
	else
	enh_desc_end_tx_desc_on_ring(p, ter);
	}

	static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
	bool csum_flag, int mode, bool tx_own,
	bool ls, unsigned int tot_pkt_len)
	{
	unsigned int tdes0 = le32_to_cpu(p->des0);

	if (mode == STMMAC_CHAIN_MODE)
	enh_set_tx_desc_len_on_chain(p, len);
	else
	enh_set_tx_desc_len_on_ring(p, len);

	if (is_fs)
	tdes0 \|= ETDES0_FIRST_SEGMENT;
	else
	tdes0 &= ~ETDES0_FIRST_SEGMENT;

	if (likely(csum_flag))
	tdes0 \|= (TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);
	else
	tdes0 &= ~(TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);

	if (ls)
	tdes0 \|= ETDES0_LAST_SEGMENT;

	/* Finally set the OWN bit. Later the DMA will start! */
	if (tx_own)
	tdes0 \|= ETDES0_OWN;

	if (is_fs && tx_own)
	/* When the own bit, for the first frame, has to be set, all
	* descriptors for the same frame has to be set before, to
	* avoid race condition.
	*/
	dma_wmb();

	p->des0 = cpu_to_le32(tdes0);
	}

	static void enh_desc_set_tx_ic(struct dma_desc *p)
	{
	p->des0 \|= cpu_to_le32(ETDES0_INTERRUPT);
	}

	static int enh_desc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
	{
	unsigned int csum = 0;
	/* The type-1 checksum offload engines append the checksum at
	* the end of frame and the two bytes of checksum are added in
	* the length.
	* Adjust for that in the framelen for type-1 checksum offload
	* engines.
	*/
	if (rx_coe_type == STMMAC_RX_COE_TYPE1)
	csum = 2;

	return (((le32_to_cpu(p->des0) & RDES0_FRAME_LEN_MASK)
	>> RDES0_FRAME_LEN_SHIFT) - csum);
	}

	static void enh_desc_enable_tx_timestamp(struct dma_desc *p)
	{
	p->des0 \|= cpu_to_le32(ETDES0_TIME_STAMP_ENABLE);
	}

	static int enh_desc_get_tx_timestamp_status(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des0) & ETDES0_TIME_STAMP_STATUS) >> 17;
	}

	static void enh_desc_get_timestamp(void desc, u32 ats, u64 ts)
	{
	u64 ns;

	if (ats) {
	struct dma_extended_desc p = (struct dma_extended_desc )desc;
	ns = le32_to_cpu(p->des6);
	/* convert high/sec time stamp value to nanosecond */
	ns += le32_to_cpu(p->des7) * 1000000000ULL;
	} else {
	struct dma_desc p = (struct dma_desc )desc;
	ns = le32_to_cpu(p->des2);
	ns += le32_to_cpu(p->des3) * 1000000000ULL;
	}

	*ts = ns;
	}

	static int enh_desc_get_rx_timestamp_status(void desc, void next_desc,
	u32 ats)
	{
	if (ats) {
	struct dma_extended_desc p = (struct dma_extended_desc )desc;
	return (le32_to_cpu(p->basic.des0) & RDES0_IPC_CSUM_ERROR) >> 7;
	} else {
	struct dma_desc p = (struct dma_desc )desc;
	if ((le32_to_cpu(p->des2) == 0xffffffff) &&
	(le32_to_cpu(p->des3) == 0xffffffff))
	/* timestamp is corrupted, hence don't store it */
	return 0;
	else
	return 1;
	}
	}

	static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
	{
	struct dma_extended_desc ep = (struct dma_extended_desc )head;
	int i;

	pr_info("Extended %s descriptor ring:\n", rx ? "RX" : "TX");

	for (i = 0; i < size; i++) {
	u64 x;

	x = (u64 )ep;
	pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
	i, (unsigned int)virt_to_phys(ep),
	(unsigned int)x, (unsigned int)(x >> 32),
	ep->basic.des2, ep->basic.des3);
	ep++;
	}
	pr_info("\n");
	}

	static void enh_desc_get_addr(struct dma_desc p, unsigned int addr)
	{
	*addr = le32_to_cpu(p->des2);
	}

	static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
	{
	p->des2 = cpu_to_le32(addr);
	}

	static void enh_desc_clear(struct dma_desc *p)
	{
	p->des2 = 0;
	}

	const struct stmmac_desc_ops enh_desc_ops = {
	.tx_status = enh_desc_get_tx_status,
	.rx_status = enh_desc_get_rx_status,
	.get_tx_len = enh_desc_get_tx_len,
	.init_rx_desc = enh_desc_init_rx_desc,
	.init_tx_desc = enh_desc_init_tx_desc,
	.get_tx_owner = enh_desc_get_tx_owner,
	.release_tx_desc = enh_desc_release_tx_desc,
	.prepare_tx_desc = enh_desc_prepare_tx_desc,
	.set_tx_ic = enh_desc_set_tx_ic,
	.get_tx_ls = enh_desc_get_tx_ls,
	.set_tx_owner = enh_desc_set_tx_owner,
	.set_rx_owner = enh_desc_set_rx_owner,
	.get_rx_frame_len = enh_desc_get_rx_frame_len,
	.rx_extended_status = enh_desc_get_ext_status,
	.enable_tx_timestamp = enh_desc_enable_tx_timestamp,
	.get_tx_timestamp_status = enh_desc_get_tx_timestamp_status,
	.get_timestamp = enh_desc_get_timestamp,
	.get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
	.display_ring = enh_desc_display_ring,
	.get_addr = enh_desc_get_addr,
	.set_addr = enh_desc_set_addr,
	.clear = enh_desc_clear,
	};