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authorYunsheng Lin <linyunsheng@huawei.com>2019-04-04 16:17:52 +0800
committerDavid S. Miller <davem@davemloft.net>2019-04-04 10:20:38 -0700
commit0aa3d88a9197fd7176dbaf5db769837be6afdf46 (patch)
tree946e230d1941e1b8b12879e32716529d8c46053b
parent72110b567479f0282489a9b3747e76d8c67d75f5 (diff)
downloadlinux-0aa3d88a9197fd7176dbaf5db769837be6afdf46.tar.bz2
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>
-rw-r--r--drivers/net/ethernet/hisilicon/hns3/hns3_enet.h15
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)