Commit e608c314 authored by Jian Shen's avatar Jian Shen Committed by Jiantao Xiao
Browse files

net: hns3: refine the tcam key convert handle 

mainline inclusion
from mainline-v6.4-rc7
commit 9b476494
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7IEJR
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b476494da1aad70f4f083e853eb817bcb292d08



----------------------------------------------------------------------

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: default avatarJian Shen <shenjian15@huawei.com>
Signed-off-by: default avatarHao Lan <lanhao@huawei.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarJiantao Xiao <xiaojiantao1@h-partners.com>
parent 82c66282

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

+3 −8
Original line number Diff line number Diff line
@@ -822,15 +822,10 @@ 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)))