Commit 26f1ccdf authored by Yunsheng Lin's avatar Yunsheng Lin Committed by David S. Miller
Browse files

net: hns3: minor refactor related to desc_cb handling 



desc_cb is used to store mapping and freeing info for the
corresponding desc, which is used in the cleaning process.
There will be more desc_cb type coming up when supporting the
tx bounce buffer, change desc_cb type to bit-wise value in order
to reduce the desc_cb type checking operation in the data path.

Also move the desc_cb type definition to hns3_enet.h because it
is only used in hns3_enet.c, and declare a local variable desc_cb
in hns3_clear_desc() to reduce lines of code.

Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: default avatarGuangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a078d981

drivers/net/ethernet/hisilicon/hns3/hnae3.h

+0 −7
Original line number Diff line number Diff line
@@ -159,13 +159,6 @@ enum HNAE3_PF_CAP_BITS { 
#define ring_ptr_move_bw(ring, p) \

	((ring)->p = ((ring)->p - 1 + (ring)->desc_num) % (ring)->desc_num)



enum hns_desc_type {

	DESC_TYPE_UNKNOWN,

	DESC_TYPE_SKB,

	DESC_TYPE_FRAGLIST_SKB,

	DESC_TYPE_PAGE,

};



struct hnae3_handle;



struct hnae3_queue {

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

+18 −22
Original line number Diff line number Diff line
@@ -1413,7 +1413,7 @@ static int hns3_fill_skb_desc(struct hns3_enet_ring *ring, 
}



static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,

			  unsigned int size, enum hns_desc_type type)

			  unsigned int size, unsigned int type)

{

#define HNS3_LIKELY_BD_NUM	1
@@ -1425,8 +1425,7 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv, 
	int k, sizeoflast;

	dma_addr_t dma;



	if (type == DESC_TYPE_FRAGLIST_SKB ||

	    type == DESC_TYPE_SKB) {

	if (type & (DESC_TYPE_FRAGLIST_SKB | DESC_TYPE_SKB)) {

		struct sk_buff *skb = (struct sk_buff *)priv;



		dma = dma_map_single(dev, skb->data, size, DMA_TO_DEVICE);
@@ -1704,6 +1703,7 @@ static void hns3_clear_desc(struct hns3_enet_ring *ring, int next_to_use_orig) 


	for (i = 0; i < ring->desc_num; i++) {

		struct hns3_desc *desc = &ring->desc[ring->next_to_use];

		struct hns3_desc_cb *desc_cb;



		memset(desc, 0, sizeof(*desc));
@@ -1714,31 +1714,27 @@ static void hns3_clear_desc(struct hns3_enet_ring *ring, int next_to_use_orig) 
		/* rollback one */

		ring_ptr_move_bw(ring, next_to_use);



		if (!ring->desc_cb[ring->next_to_use].dma)

		desc_cb = &ring->desc_cb[ring->next_to_use];



		if (!desc_cb->dma)

			continue;



		/* unmap the descriptor dma address */

		if (ring->desc_cb[ring->next_to_use].type == DESC_TYPE_SKB ||

		    ring->desc_cb[ring->next_to_use].type ==

		    DESC_TYPE_FRAGLIST_SKB)

			dma_unmap_single(dev,

					 ring->desc_cb[ring->next_to_use].dma,

					ring->desc_cb[ring->next_to_use].length,

		if (desc_cb->type & (DESC_TYPE_SKB | DESC_TYPE_FRAGLIST_SKB))

			dma_unmap_single(dev, desc_cb->dma, desc_cb->length,

					 DMA_TO_DEVICE);

		else if (ring->desc_cb[ring->next_to_use].length)

			dma_unmap_page(dev,

				       ring->desc_cb[ring->next_to_use].dma,

				       ring->desc_cb[ring->next_to_use].length,

		else if (desc_cb->length)

			dma_unmap_page(dev, desc_cb->dma, desc_cb->length,

				       DMA_TO_DEVICE);



		ring->desc_cb[ring->next_to_use].length = 0;

		ring->desc_cb[ring->next_to_use].dma = 0;

		ring->desc_cb[ring->next_to_use].type = DESC_TYPE_UNKNOWN;

		desc_cb->length = 0;

		desc_cb->dma = 0;

		desc_cb->type = DESC_TYPE_UNKNOWN;

	}

}



static int hns3_fill_skb_to_desc(struct hns3_enet_ring *ring,

				 struct sk_buff *skb, enum hns_desc_type type)

				 struct sk_buff *skb, unsigned int type)

{

	unsigned int size = skb_headlen(skb);

	struct sk_buff *frag_skb;
@@ -2859,7 +2855,7 @@ static int hns3_alloc_buffer(struct hns3_enet_ring *ring, 
static void hns3_free_buffer(struct hns3_enet_ring *ring,

			     struct hns3_desc_cb *cb, int budget)

{

	if (cb->type == DESC_TYPE_SKB)

	if (cb->type & DESC_TYPE_SKB)

		napi_consume_skb(cb->priv, budget);

	else if (!HNAE3_IS_TX_RING(ring) && cb->pagecnt_bias)

		__page_frag_cache_drain(cb->priv, cb->pagecnt_bias);
@@ -2880,7 +2876,7 @@ static int hns3_map_buffer(struct hns3_enet_ring *ring, struct hns3_desc_cb *cb) 
static void hns3_unmap_buffer(struct hns3_enet_ring *ring,

			      struct hns3_desc_cb *cb)

{

	if (cb->type == DESC_TYPE_SKB || cb->type == DESC_TYPE_FRAGLIST_SKB)

	if (cb->type & (DESC_TYPE_SKB | DESC_TYPE_FRAGLIST_SKB))

		dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,

				 ring_to_dma_dir(ring));

	else if (cb->length)
@@ -3037,7 +3033,7 @@ static bool hns3_nic_reclaim_desc(struct hns3_enet_ring *ring, 


		desc_cb = &ring->desc_cb[ntc];



		if (desc_cb->type == DESC_TYPE_SKB) {

		if (desc_cb->type & DESC_TYPE_SKB) {

			(*pkts)++;

			(*bytes) += desc_cb->send_bytes;

		}

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

+7 −0
Original line number Diff line number Diff line
@@ -299,6 +299,13 @@ struct __packed hns3_desc { 
	};

};



enum hns3_desc_type {

	DESC_TYPE_UNKNOWN		= 0,

	DESC_TYPE_SKB			= 1 << 0,

	DESC_TYPE_FRAGLIST_SKB		= 1 << 1,

	DESC_TYPE_PAGE			= 1 << 2,

};



struct hns3_desc_cb {

	dma_addr_t dma; /* dma address of this desc */

	void *buf;      /* cpu addr for a desc */