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

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

   Copyright (C) 2007-2009  STMicroelectronics Ltd


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

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

 static int ndesc_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);
 	unsigned int tdes1 = le32_to_cpu(p->des1);
 	int ret = tx_done;

 	/* Get tx owner first */
 	if (unlikely(tdes0 & TDES0_OWN))
 		return tx_dma_own;

 	/* Verify tx error by looking at the last segment. */
 	if (likely(!(tdes1 & TDES1_LAST_SEGMENT)))
 		return tx_not_ls;

 	if (unlikely(tdes0 & TDES0_ERROR_SUMMARY)) {
 		if (unlikely(tdes0 & TDES0_UNDERFLOW_ERROR)) {
 			x->tx_underflow++;
 			stats->tx_fifo_errors++;
 		}
 		if (unlikely(tdes0 & TDES0_NO_CARRIER)) {
 			x->tx_carrier++;
 			stats->tx_carrier_errors++;
 		}
 		if (unlikely(tdes0 & TDES0_LOSS_CARRIER)) {
 			x->tx_losscarrier++;
 			stats->tx_carrier_errors++;
 		}
 		if (unlikely((tdes0 & TDES0_EXCESSIVE_DEFERRAL) ||
 			     (tdes0 & TDES0_EXCESSIVE_COLLISIONS) ||
 			     (tdes0 & TDES0_LATE_COLLISION))) {
 			unsigned int collisions;

 			collisions = (tdes0 & TDES0_COLLISION_COUNT_MASK) >> 3;
 			stats->collisions += collisions;
 		}
 		ret = tx_err;
 	}

 	if (tdes0 & TDES0_VLAN_FRAME)
 		x->tx_vlan++;

 	if (unlikely(tdes0 & TDES0_DEFERRED))
 		x->tx_deferred++;

 	return ret;
 }

 static int ndesc_get_tx_len(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des1) & RDES1_BUFFER1_SIZE_MASK);
 }

 /* This function verifies if each incoming frame has some errors
  * and, if required, updates the multicast statistics.
  * In case of success, it returns good_frame because the GMAC device
  * is supposed to be able to compute the csum in HW. */
 static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
 			       struct dma_desc *p)
 {
 	int ret = good_frame;
 	unsigned int rdes0 = le32_to_cpu(p->des0);
 	struct net_device_stats *stats = (struct net_device_stats *)data;

 	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++;
 		if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL))
 			x->sa_filter_fail++;
 		if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
 			x->overflow_error++;
 		if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
 			x->ipc_csum_error++;
 		if (unlikely(rdes0 & RDES0_COLLISION)) {
 			x->rx_collision++;
 			stats->collisions++;
 		}
 		if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
 			x->rx_crc_errors++;
 			stats->rx_crc_errors++;
 		}
 		ret = discard_frame;
 	}
 	if (unlikely(rdes0 & RDES0_DRIBBLING))
 		x->dribbling_bit++;

 	if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
 		x->rx_length++;
 		ret = discard_frame;
 	}
 	if (unlikely(rdes0 & RDES0_MII_ERROR)) {
 		x->rx_mii++;
 		ret = discard_frame;
 	}
 #ifdef STMMAC_VLAN_TAG_USED
 	if (rdes0 & RDES0_VLAN_TAG)
 		x->vlan_tag++;
 #endif
 	return ret;
 }

 static void ndesc_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_2KiB - 1);
 	p->des1 |= cpu_to_le32(bfsize1 & RDES1_BUFFER1_SIZE_MASK);

 	if (mode == STMMAC_CHAIN_MODE)
 		ndesc_rx_set_on_chain(p, end);
 	else
 		ndesc_rx_set_on_ring(p, end, bfsize);

 	if (disable_rx_ic)
 		p->des1 |= cpu_to_le32(RDES1_DISABLE_IC);
 }

 static void ndesc_init_tx_desc(struct dma_desc *p, int mode, int end)
 {
 	p->des0 &= cpu_to_le32(~TDES0_OWN);
 	if (mode == STMMAC_CHAIN_MODE)
 		ndesc_tx_set_on_chain(p);
 	else
 		ndesc_end_tx_desc_on_ring(p, end);
 }

 static int ndesc_get_tx_owner(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des0) & TDES0_OWN) >> 31;
 }

 static void ndesc_set_tx_owner(struct dma_desc *p)
 {
 	p->des0 |= cpu_to_le32(TDES0_OWN);
 }

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

 static int ndesc_get_tx_ls(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des1) & TDES1_LAST_SEGMENT) >> 30;
 }

 static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
 {
 	int ter = (le32_to_cpu(p->des1) & TDES1_END_RING) >> 25;

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

 static void ndesc_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 tdes1 = le32_to_cpu(p->des1);

 	if (is_fs)
 		tdes1 |= TDES1_FIRST_SEGMENT;
 	else
 		tdes1 &= ~TDES1_FIRST_SEGMENT;

 	if (likely(csum_flag))
 		tdes1 |= (TX_CIC_FULL) << TDES1_CHECKSUM_INSERTION_SHIFT;
 	else
 		tdes1 &= ~(TX_CIC_FULL << TDES1_CHECKSUM_INSERTION_SHIFT);

 	if (ls)
 		tdes1 |= TDES1_LAST_SEGMENT;

 	p->des1 = cpu_to_le32(tdes1);

 	if (mode == STMMAC_CHAIN_MODE)
 		norm_set_tx_desc_len_on_chain(p, len);
 	else
 		norm_set_tx_desc_len_on_ring(p, len);

 	if (tx_own)
 		p->des0 |= cpu_to_le32(TDES0_OWN);
 }

 static void ndesc_set_tx_ic(struct dma_desc *p)
 {
 	p->des1 |= cpu_to_le32(TDES1_INTERRUPT);
 }

 static int ndesc_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 ndesc_enable_tx_timestamp(struct dma_desc *p)
 {
 	p->des1 |= cpu_to_le32(TDES1_TIME_STAMP_ENABLE);
 }

 static int ndesc_get_tx_timestamp_status(struct dma_desc *p)
 {
 	return (le32_to_cpu(p->des0) & TDES0_TIME_STAMP_STATUS) >> 17;
 }

 static void ndesc_get_timestamp(void *desc, u32 ats, u64 *ts)
 {
 	struct dma_desc *p = (struct dma_desc *)desc;
 	u64 ns;

 	ns = le32_to_cpu(p->des2);
 	/* convert high/sec time stamp value to nanosecond */
 	ns += le32_to_cpu(p->des3) * 1000000000ULL;

 	*ts = ns;
 }

 static int ndesc_get_rx_timestamp_status(void *desc, void *next_desc, u32 ats)
 {
 	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 ndesc_display_ring(void *head, unsigned int size, bool rx,
 			       dma_addr_t dma_rx_phy, unsigned int desc_size)
 {
 	struct dma_desc *p = (struct dma_desc *)head;
 	dma_addr_t dma_addr;
 	int i;

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

 	for (i = 0; i < size; i++) {
 		u64 x;
 		dma_addr = dma_rx_phy + i * sizeof(*p);

 		x = *(u64 *)p;
 		pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x",
 			i, &dma_addr,
 			(unsigned int)x, (unsigned int)(x >> 32),
 			p->des2, p->des3);
 		p++;
 	}
 	pr_info("\n");
 }

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

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

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

 const struct stmmac_desc_ops ndesc_ops = {
 	.tx_status = ndesc_get_tx_status,
 	.rx_status = ndesc_get_rx_status,
 	.get_tx_len = ndesc_get_tx_len,
 	.init_rx_desc = ndesc_init_rx_desc,
 	.init_tx_desc = ndesc_init_tx_desc,
 	.get_tx_owner = ndesc_get_tx_owner,
 	.release_tx_desc = ndesc_release_tx_desc,
 	.prepare_tx_desc = ndesc_prepare_tx_desc,
 	.set_tx_ic = ndesc_set_tx_ic,
 	.get_tx_ls = ndesc_get_tx_ls,
 	.set_tx_owner = ndesc_set_tx_owner,
 	.set_rx_owner = ndesc_set_rx_owner,
 	.get_rx_frame_len = ndesc_get_rx_frame_len,
 	.enable_tx_timestamp = ndesc_enable_tx_timestamp,
 	.get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
 	.get_timestamp = ndesc_get_timestamp,
 	.get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 	.display_ring = ndesc_display_ring,
 	.get_addr = ndesc_get_addr,
 	.set_addr = ndesc_set_addr,
 	.clear = ndesc_clear,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/*******************************************************************************
	This contains the functions to handle the normal descriptors.

	Copyright (C) 2007-2009 STMicroelectronics Ltd


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

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

	static int ndesc_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);
	unsigned int tdes1 = le32_to_cpu(p->des1);
	int ret = tx_done;

	/* Get tx owner first */
	if (unlikely(tdes0 & TDES0_OWN))
	return tx_dma_own;

	/* Verify tx error by looking at the last segment. */
	if (likely(!(tdes1 & TDES1_LAST_SEGMENT)))
	return tx_not_ls;

	if (unlikely(tdes0 & TDES0_ERROR_SUMMARY)) {
	if (unlikely(tdes0 & TDES0_UNDERFLOW_ERROR)) {
	x->tx_underflow++;
	stats->tx_fifo_errors++;
	}
	if (unlikely(tdes0 & TDES0_NO_CARRIER)) {
	x->tx_carrier++;
	stats->tx_carrier_errors++;
	}
	if (unlikely(tdes0 & TDES0_LOSS_CARRIER)) {
	x->tx_losscarrier++;
	stats->tx_carrier_errors++;
	}
	if (unlikely((tdes0 & TDES0_EXCESSIVE_DEFERRAL) \|\|
	(tdes0 & TDES0_EXCESSIVE_COLLISIONS) \|\|
	(tdes0 & TDES0_LATE_COLLISION))) {
	unsigned int collisions;

	collisions = (tdes0 & TDES0_COLLISION_COUNT_MASK) >> 3;
	stats->collisions += collisions;
	}
	ret = tx_err;
	}

	if (tdes0 & TDES0_VLAN_FRAME)
	x->tx_vlan++;

	if (unlikely(tdes0 & TDES0_DEFERRED))
	x->tx_deferred++;

	return ret;
	}

	static int ndesc_get_tx_len(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des1) & RDES1_BUFFER1_SIZE_MASK);
	}

	/* This function verifies if each incoming frame has some errors
	* and, if required, updates the multicast statistics.
	* In case of success, it returns good_frame because the GMAC device
	* is supposed to be able to compute the csum in HW. */
	static int ndesc_get_rx_status(void data, struct stmmac_extra_stats x,
	struct dma_desc *p)
	{
	int ret = good_frame;
	unsigned int rdes0 = le32_to_cpu(p->des0);
	struct net_device_stats stats = (struct net_device_stats )data;

	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++;
	if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL))
	x->sa_filter_fail++;
	if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
	x->overflow_error++;
	if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
	x->ipc_csum_error++;
	if (unlikely(rdes0 & RDES0_COLLISION)) {
	x->rx_collision++;
	stats->collisions++;
	}
	if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
	x->rx_crc_errors++;
	stats->rx_crc_errors++;
	}
	ret = discard_frame;
	}
	if (unlikely(rdes0 & RDES0_DRIBBLING))
	x->dribbling_bit++;

	if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
	x->rx_length++;
	ret = discard_frame;
	}
	if (unlikely(rdes0 & RDES0_MII_ERROR)) {
	x->rx_mii++;
	ret = discard_frame;
	}
	#ifdef STMMAC_VLAN_TAG_USED
	if (rdes0 & RDES0_VLAN_TAG)
	x->vlan_tag++;
	#endif
	return ret;
	}

	static void ndesc_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_2KiB - 1);
	p->des1 \|= cpu_to_le32(bfsize1 & RDES1_BUFFER1_SIZE_MASK);

	if (mode == STMMAC_CHAIN_MODE)
	ndesc_rx_set_on_chain(p, end);
	else
	ndesc_rx_set_on_ring(p, end, bfsize);

	if (disable_rx_ic)
	p->des1 \|= cpu_to_le32(RDES1_DISABLE_IC);
	}

	static void ndesc_init_tx_desc(struct dma_desc *p, int mode, int end)
	{
	p->des0 &= cpu_to_le32(~TDES0_OWN);
	if (mode == STMMAC_CHAIN_MODE)
	ndesc_tx_set_on_chain(p);
	else
	ndesc_end_tx_desc_on_ring(p, end);
	}

	static int ndesc_get_tx_owner(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des0) & TDES0_OWN) >> 31;
	}

	static void ndesc_set_tx_owner(struct dma_desc *p)
	{
	p->des0 \|= cpu_to_le32(TDES0_OWN);
	}

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

	static int ndesc_get_tx_ls(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des1) & TDES1_LAST_SEGMENT) >> 30;
	}

	static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
	{
	int ter = (le32_to_cpu(p->des1) & TDES1_END_RING) >> 25;

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

	static void ndesc_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 tdes1 = le32_to_cpu(p->des1);

	if (is_fs)
	tdes1 \|= TDES1_FIRST_SEGMENT;
	else
	tdes1 &= ~TDES1_FIRST_SEGMENT;

	if (likely(csum_flag))
	tdes1 \|= (TX_CIC_FULL) << TDES1_CHECKSUM_INSERTION_SHIFT;
	else
	tdes1 &= ~(TX_CIC_FULL << TDES1_CHECKSUM_INSERTION_SHIFT);

	if (ls)
	tdes1 \|= TDES1_LAST_SEGMENT;

	p->des1 = cpu_to_le32(tdes1);

	if (mode == STMMAC_CHAIN_MODE)
	norm_set_tx_desc_len_on_chain(p, len);
	else
	norm_set_tx_desc_len_on_ring(p, len);

	if (tx_own)
	p->des0 \|= cpu_to_le32(TDES0_OWN);
	}

	static void ndesc_set_tx_ic(struct dma_desc *p)
	{
	p->des1 \|= cpu_to_le32(TDES1_INTERRUPT);
	}

	static int ndesc_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 ndesc_enable_tx_timestamp(struct dma_desc *p)
	{
	p->des1 \|= cpu_to_le32(TDES1_TIME_STAMP_ENABLE);
	}

	static int ndesc_get_tx_timestamp_status(struct dma_desc *p)
	{
	return (le32_to_cpu(p->des0) & TDES0_TIME_STAMP_STATUS) >> 17;
	}

	static void ndesc_get_timestamp(void desc, u32 ats, u64 ts)
	{
	struct dma_desc p = (struct dma_desc )desc;
	u64 ns;

	ns = le32_to_cpu(p->des2);
	/* convert high/sec time stamp value to nanosecond */
	ns += le32_to_cpu(p->des3) * 1000000000ULL;

	*ts = ns;
	}

	static int ndesc_get_rx_timestamp_status(void desc, void next_desc, u32 ats)
	{
	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 ndesc_display_ring(void *head, unsigned int size, bool rx,
	dma_addr_t dma_rx_phy, unsigned int desc_size)
	{
	struct dma_desc p = (struct dma_desc )head;
	dma_addr_t dma_addr;
	int i;

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

	for (i = 0; i < size; i++) {
	u64 x;
	dma_addr = dma_rx_phy + i * sizeof(*p);

	x = (u64 )p;
	pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x",
	i, &dma_addr,
	(unsigned int)x, (unsigned int)(x >> 32),
	p->des2, p->des3);
	p++;
	}
	pr_info("\n");
	}

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

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

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

	const struct stmmac_desc_ops ndesc_ops = {
	.tx_status = ndesc_get_tx_status,
	.rx_status = ndesc_get_rx_status,
	.get_tx_len = ndesc_get_tx_len,
	.init_rx_desc = ndesc_init_rx_desc,
	.init_tx_desc = ndesc_init_tx_desc,
	.get_tx_owner = ndesc_get_tx_owner,
	.release_tx_desc = ndesc_release_tx_desc,
	.prepare_tx_desc = ndesc_prepare_tx_desc,
	.set_tx_ic = ndesc_set_tx_ic,
	.get_tx_ls = ndesc_get_tx_ls,
	.set_tx_owner = ndesc_set_tx_owner,
	.set_rx_owner = ndesc_set_rx_owner,
	.get_rx_frame_len = ndesc_get_rx_frame_len,
	.enable_tx_timestamp = ndesc_enable_tx_timestamp,
	.get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
	.get_timestamp = ndesc_get_timestamp,
	.get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
	.display_ring = ndesc_display_ring,
	.get_addr = ndesc_get_addr,
	.set_addr = ndesc_set_addr,
	.clear = ndesc_clear,
	};