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Commit aff3d9ef authored by Joao Pinto's avatar Joao Pinto Committed by David S. Miller
Browse files

net: stmmac: enable multiple buffers 



This patch creates 2 new structures (stmmac_tx_queue and stmmac_rx_queue)
in include/linux/stmmac.h, enabling that each RX and TX queue has its
own buffers and data.

Signed-off-by: default avatarJoao Pinto <jpinto@synopsys.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent de6b08fd

drivers/net/ethernet/stmicro/stmmac/chain_mode.c

+25 −20
Original line number Diff line number Diff line
@@ -26,12 +26,15 @@ 


static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)

{

	struct stmmac_priv *priv = (struct stmmac_priv *)p;

	unsigned int entry = priv->cur_tx;

	struct dma_desc *desc = priv->dma_tx + entry;

	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)p;

	unsigned int nopaged_len = skb_headlen(skb);

	struct stmmac_priv *priv = tx_q->priv_data;

	unsigned int entry = tx_q->cur_tx;

	unsigned int bmax, des2;

	unsigned int i = 1, len;

	struct dma_desc *desc;



	desc = tx_q->dma_tx + entry;



	if (priv->plat->enh_desc)

		bmax = BUF_SIZE_8KiB;
@@ -45,16 +48,16 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
	desc->des2 = cpu_to_le32(des2);

	if (dma_mapping_error(priv->device, des2))

		return -1;

	priv->tx_skbuff_dma[entry].buf = des2;

	priv->tx_skbuff_dma[entry].len = bmax;

	tx_q->tx_skbuff_dma[entry].buf = des2;

	tx_q->tx_skbuff_dma[entry].len = bmax;

	/* do not close the descriptor and do not set own bit */

	priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_CHAIN_MODE,

					0, false);



	while (len != 0) {

		priv->tx_skbuff[entry] = NULL;

		tx_q->tx_skbuff[entry] = NULL;

		entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE);

		desc = priv->dma_tx + entry;

		desc = tx_q->dma_tx + entry;



		if (len > bmax) {

			des2 = dma_map_single(priv->device,
@@ -63,8 +66,8 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
			desc->des2 = cpu_to_le32(des2);

			if (dma_mapping_error(priv->device, des2))

				return -1;

			priv->tx_skbuff_dma[entry].buf = des2;

			priv->tx_skbuff_dma[entry].len = bmax;

			tx_q->tx_skbuff_dma[entry].buf = des2;

			tx_q->tx_skbuff_dma[entry].len = bmax;

			priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,

							STMMAC_CHAIN_MODE, 1,

							false);
@@ -77,8 +80,8 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
			desc->des2 = cpu_to_le32(des2);

			if (dma_mapping_error(priv->device, des2))

				return -1;

			priv->tx_skbuff_dma[entry].buf = des2;

			priv->tx_skbuff_dma[entry].len = len;

			tx_q->tx_skbuff_dma[entry].buf = des2;

			tx_q->tx_skbuff_dma[entry].len = len;

			/* last descriptor can be set now */

			priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,

							STMMAC_CHAIN_MODE, 1,
@@ -87,7 +90,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
		}

	}



	priv->cur_tx = entry;

	tx_q->cur_tx = entry;



	return entry;

}
@@ -136,32 +139,34 @@ static void stmmac_init_dma_chain(void *des, dma_addr_t phy_addr, 


static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)

{

	struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;

	struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)priv_ptr;

	struct stmmac_priv *priv = rx_q->priv_data;



	if (priv->hwts_rx_en && !priv->extend_desc)

		/* NOTE: Device will overwrite des3 with timestamp value if

		 * 1588-2002 time stamping is enabled, hence reinitialize it

		 * to keep explicit chaining in the descriptor.

		 */

		p->des3 = cpu_to_le32((unsigned int)(priv->dma_rx_phy +

				      (((priv->dirty_rx) + 1) %

		p->des3 = cpu_to_le32((unsigned int)(rx_q->dma_rx_phy +

				      (((rx_q->dirty_rx) + 1) %

				       DMA_RX_SIZE) *

				      sizeof(struct dma_desc)));

}



static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)

{

	struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;

	unsigned int entry = priv->dirty_tx;

	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)priv_ptr;

	struct stmmac_priv *priv = tx_q->priv_data;

	unsigned int entry = tx_q->dirty_tx;



	if (priv->tx_skbuff_dma[entry].last_segment && !priv->extend_desc &&

	if (tx_q->tx_skbuff_dma[entry].last_segment && !priv->extend_desc &&

	    priv->hwts_tx_en)

		/* NOTE: Device will overwrite des3 with timestamp value if

		 * 1588-2002 time stamping is enabled, hence reinitialize it

		 * to keep explicit chaining in the descriptor.

		 */

		p->des3 = cpu_to_le32((unsigned int)((priv->dma_tx_phy +

				      ((priv->dirty_tx + 1) % DMA_TX_SIZE))

		p->des3 = cpu_to_le32((unsigned int)((tx_q->dma_tx_phy +

				      ((tx_q->dirty_tx + 1) % DMA_TX_SIZE))

				      * sizeof(struct dma_desc)));

}

drivers/net/ethernet/stmicro/stmmac/ring_mode.c

+24 −22
Original line number Diff line number Diff line
@@ -26,16 +26,17 @@ 


static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)

{

	struct stmmac_priv *priv = (struct stmmac_priv *)p;

	unsigned int entry = priv->cur_tx;

	struct dma_desc *desc;

	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)p;

	unsigned int nopaged_len = skb_headlen(skb);

	struct stmmac_priv *priv = tx_q->priv_data;

	unsigned int entry = tx_q->cur_tx;

	unsigned int bmax, len, des2;

	struct dma_desc *desc;



	if (priv->extend_desc)

		desc = (struct dma_desc *)(priv->dma_etx + entry);

		desc = (struct dma_desc *)(tx_q->dma_etx + entry);

	else

		desc = priv->dma_tx + entry;

		desc = tx_q->dma_tx + entry;



	if (priv->plat->enh_desc)

		bmax = BUF_SIZE_8KiB;
@@ -52,29 +53,29 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
		if (dma_mapping_error(priv->device, des2))

			return -1;



		priv->tx_skbuff_dma[entry].buf = des2;

		priv->tx_skbuff_dma[entry].len = bmax;

		priv->tx_skbuff_dma[entry].is_jumbo = true;

		tx_q->tx_skbuff_dma[entry].buf = des2;

		tx_q->tx_skbuff_dma[entry].len = bmax;

		tx_q->tx_skbuff_dma[entry].is_jumbo = true;



		desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);

		priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum,

						STMMAC_RING_MODE, 0, false);

		priv->tx_skbuff[entry] = NULL;

		tx_q->tx_skbuff[entry] = NULL;

		entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE);



		if (priv->extend_desc)

			desc = (struct dma_desc *)(priv->dma_etx + entry);

			desc = (struct dma_desc *)(tx_q->dma_etx + entry);

		else

			desc = priv->dma_tx + entry;

			desc = tx_q->dma_tx + entry;



		des2 = dma_map_single(priv->device, skb->data + bmax, len,

				      DMA_TO_DEVICE);

		desc->des2 = cpu_to_le32(des2);

		if (dma_mapping_error(priv->device, des2))

			return -1;

		priv->tx_skbuff_dma[entry].buf = des2;

		priv->tx_skbuff_dma[entry].len = len;

		priv->tx_skbuff_dma[entry].is_jumbo = true;

		tx_q->tx_skbuff_dma[entry].buf = des2;

		tx_q->tx_skbuff_dma[entry].len = len;

		tx_q->tx_skbuff_dma[entry].is_jumbo = true;



		desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);

		priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
@@ -85,15 +86,15 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) 
		desc->des2 = cpu_to_le32(des2);

		if (dma_mapping_error(priv->device, des2))

			return -1;

		priv->tx_skbuff_dma[entry].buf = des2;

		priv->tx_skbuff_dma[entry].len = nopaged_len;

		priv->tx_skbuff_dma[entry].is_jumbo = true;

		tx_q->tx_skbuff_dma[entry].buf = des2;

		tx_q->tx_skbuff_dma[entry].len = nopaged_len;

		tx_q->tx_skbuff_dma[entry].is_jumbo = true;

		desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);

		priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum,

						STMMAC_RING_MODE, 0, true);

	}



	priv->cur_tx = entry;

	tx_q->cur_tx = entry;



	return entry;

}
@@ -125,12 +126,13 @@ static void stmmac_init_desc3(struct dma_desc *p) 


static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)

{

	struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;

	unsigned int entry = priv->dirty_tx;

	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)priv_ptr;

	struct stmmac_priv *priv = tx_q->priv_data;

	unsigned int entry = tx_q->dirty_tx;



	/* des3 is only used for jumbo frames tx or time stamping */

	if (unlikely(priv->tx_skbuff_dma[entry].is_jumbo ||

		     (priv->tx_skbuff_dma[entry].last_segment &&

	if (unlikely(tx_q->tx_skbuff_dma[entry].is_jumbo ||

		     (tx_q->tx_skbuff_dma[entry].last_segment &&

		      !priv->extend_desc && priv->hwts_tx_en)))

		p->des3 = 0;

}

drivers/net/ethernet/stmicro/stmmac/stmmac.h

+35 −14
Original line number Diff line number Diff line
@@ -46,6 +46,35 @@ struct stmmac_tx_info { 
	bool is_jumbo;

};



/* Frequently used values are kept adjacent for cache effect */

struct stmmac_tx_queue {

	u32 queue_index;

	struct stmmac_priv *priv_data;

	struct dma_extended_desc *dma_etx ____cacheline_aligned_in_smp;

	struct dma_desc *dma_tx;

	struct sk_buff **tx_skbuff;

	struct stmmac_tx_info *tx_skbuff_dma;

	unsigned int cur_tx;

	unsigned int dirty_tx;

	dma_addr_t dma_tx_phy;

	u32 tx_tail_addr;

};



struct stmmac_rx_queue {

	u32 queue_index;

	struct stmmac_priv *priv_data;

	struct dma_extended_desc *dma_erx;

	struct dma_desc *dma_rx ____cacheline_aligned_in_smp;

	struct sk_buff **rx_skbuff;

	dma_addr_t *rx_skbuff_dma;

	struct napi_struct napi ____cacheline_aligned_in_smp;

	unsigned int cur_rx;

	unsigned int dirty_rx;

	u32 rx_zeroc_thresh;

	dma_addr_t dma_rx_phy;

	u32 rx_tail_addr;

};



struct stmmac_priv {

	/* Frequently used values are kept adjacent for cache effect */

	struct dma_extended_desc *dma_etx ____cacheline_aligned_in_smp;
@@ -56,28 +85,22 @@ struct stmmac_priv { 
	u32 tx_count_frames;

	u32 tx_coal_frames;

	u32 tx_coal_timer;

	struct stmmac_tx_info *tx_skbuff_dma;

	dma_addr_t dma_tx_phy;

	int tx_coalesce;

	int hwts_tx_en;

	bool tx_path_in_lpi_mode;

	struct timer_list txtimer;

	bool tso;



	struct dma_desc *dma_rx	____cacheline_aligned_in_smp;

	struct dma_extended_desc *dma_erx;

	struct sk_buff **rx_skbuff;

	unsigned int cur_rx;

	unsigned int dirty_rx;

	/* TX Queue */

	struct stmmac_tx_queue *tx_queue;



	/* RX Queue */

	struct stmmac_rx_queue *rx_queue;



	unsigned int dma_buf_sz;

	unsigned int rx_copybreak;

	unsigned int rx_zeroc_thresh;

	u32 rx_riwt;

	int hwts_rx_en;

	dma_addr_t *rx_skbuff_dma;

	dma_addr_t dma_rx_phy;



	struct napi_struct napi ____cacheline_aligned_in_smp;



	void __iomem *ioaddr;

	struct net_device *dev;
@@ -119,8 +142,6 @@ struct stmmac_priv { 
	spinlock_t ptp_lock;

	void __iomem *mmcaddr;

	void __iomem *ptpaddr;

	u32 rx_tail_addr;

	u32 tx_tail_addr;

	u32 mss;



#ifdef CONFIG_DEBUG_FS

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+889 −417

File changed.

Preview size limit exceeded, changes collapsed.