diff options
| author | Yunsheng Lin <linyunsheng@huawei.com> | 2019-04-04 11:17:52 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-04 20:20:38 +0300 |
| commit | 0aa3d88a9197fd7176dbaf5db769837be6afdf46 (patch) | |
| tree | 946e230d1941e1b8b12879e32716529d8c46053b /drivers/net/ethernet/hisilicon | |
| parent | 72110b567479f0282489a9b3747e76d8c67d75f5 (diff) | |
| download | linux-0aa3d88a9197fd7176dbaf5db769837be6afdf46.tar.xz | |
net: hns3: minor optimization for ring_space
This patch optimizes the ring_space by calculating the
ring space without calling ring_dist.
Also ring_dist is only used by ring_space, so this patch
removes it when it is no longer used.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/hisilicon')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h index 75669cd0c311..025d0f7f860d 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h @@ -577,18 +577,13 @@ union l4_hdr_info { unsigned char *hdr; }; -/* the distance between [begin, end) in a ring buffer - * note: there is a unuse slot between the begin and the end - */ -static inline int ring_dist(struct hns3_enet_ring *ring, int begin, int end) -{ - return (end - begin + ring->desc_num) % ring->desc_num; -} - static inline int ring_space(struct hns3_enet_ring *ring) { - return ring->desc_num - - ring_dist(ring, ring->next_to_clean, ring->next_to_use) - 1; + int begin = ring->next_to_clean; + int end = ring->next_to_use; + + return ((end >= begin) ? (ring->desc_num - end + begin) : + (begin - end)) - 1; } static inline int is_ring_empty(struct hns3_enet_ring *ring) |