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net: hns3: minor refactor related to desc_cb handling

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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: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yunsheng Lin 2021-06-16 14:36:11 +08:00 committed by David S. Miller
parent a078d981f8
commit 26f1ccdf60
3 changed files with 25 additions and 29 deletions
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7
drivers/net/ethernet/hisilicon/hns3/hnae3.h
View file

@ -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 {

40
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View file

@ -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,
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,
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 (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;
}

7
drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
View file

@ -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 */