diff options
| author | Jian Shen <shenjian15@huawei.com> | 2023-06-21 20:33:07 +0800 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-06-23 10:59:17 +0200 |
| commit | 9b476494da1aad70f4f083e853eb817bcb292d08 (patch) | |
| tree | b4bbe95e4256b2f4d1030749ff64751d19eaf8d6 /drivers | |
| parent | e6988447c15d622d11c68250a33f47b3cacb66eb (diff) | |
net: hns3: refine the tcam key convert handle
The result of expression '(k ^ ~v) & k' is exactly
the same with 'k & v', so simplify it.
(k ^ ~v) & k == k & v
The truth table (in non table form):
k == 0, v == 0:
(k ^ ~v) & k == (0 ^ ~0) & 0 == (0 ^ 1) & 0 == 1 & 0 == 0
k & v == 0 & 0 == 0
k == 0, v == 1:
(k ^ ~v) & k == (0 ^ ~1) & 0 == (0 ^ 0) & 0 == 1 & 0 == 0
k & v == 0 & 1 == 0
k == 1, v == 0:
(k ^ ~v) & k == (1 ^ ~0) & 1 == (1 ^ 1) & 1 == 0 & 1 == 0
k & v == 1 & 0 == 0
k == 1, v == 1:
(k ^ ~v) & k == (1 ^ ~1) & 1 == (1 ^ 0) & 1 == 1 & 1 == 1
k & v == 1 & 1 == 1
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Hao Lan <lanhao@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h index 81aa6b0facf5..6a43d1515585 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h @@ -835,15 +835,10 @@ struct hclge_vf_vlan_cfg { * Then for input key(k) and mask(v), we can calculate the value by * the formulae: * x = (~k) & v - * y = (k ^ ~v) & k + * y = k & v */ -#define calc_x(x, k, v) (x = ~(k) & (v)) -#define calc_y(y, k, v) \ - do { \ - const typeof(k) _k_ = (k); \ - const typeof(v) _v_ = (v); \ - (y) = (_k_ ^ ~_v_) & (_k_); \ - } while (0) +#define calc_x(x, k, v) ((x) = ~(k) & (v)) +#define calc_y(y, k, v) ((y) = (k) & (v)) #define HCLGE_MAC_STATS_FIELD_OFF(f) (offsetof(struct hclge_mac_stats, f)) #define HCLGE_STATS_READ(p, offset) (*(u64 *)((u8 *)(p) + (offset))) |