Subject: Re: [PATCH net-next 1/4] net: hns3: refine the tcam key convert handle

From: "Lanhao (Lan)" <[email-masked]>
Date: Tue, 15 Nov 2022 14:00:37 +0000

Can you please explain why do you need special define for boolean AND?
we use '&', just define a bitwise AND, not define boolean AND.

On Tue, Sep 28, 2022 at 10:28:02AM +0800, Leon Romanovsky wrote:
>On Tue, Sep 27, 2022 at 07:12:02PM +0800, Guangbin Huang wrote:
>> From: Jian Shen <[email-masked]>
>> 
>> The expression '(k ^ ~v)' is exaclty '(k & v)', and '(k & v) & k' is 
>> exaclty 'k & v'. So simplify the expression for tcam key convert.
>> 
>> It also add necessary brackets for them.
>> 
>> Signed-off-by: Jian Shen <[email-masked]>
>> Signed-off-by: Guangbin Huang <[email-masked]>
>> ---
>>  .../net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h   | 11 +++--------
>>  1 file 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 495b639b0dc2..59bfacc687c9 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
>> @@ -827,15 +827,10 @@ 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))
>
>Can you please explain why do you need special define for boolean AND?
>
>Thanks
we use '&', just define a bitwise AND, not define boolean AND.
>
>>  
>>  #define HCLGE_MAC_STATS_FIELD_OFF(f) (offsetof(struct 
>> hclge_mac_stats, f))  #define HCLGE_STATS_READ(p, offset) (*(u64 
>> *)((u8 *)(p) + (offset)))
>> --
>> 2.33.0
>> 
>

-----邮件原件-----
发件人: Leon Romanovsky <[email-masked]> 
发送时间: 2022年9月28日 18:29
收件人: huangguangbin (A) <[email-masked]>
抄送: [email-masked]; [email-masked]; [email-masked]; [email-masked]; [email-masked]; [email-masked]; shenjian (K) <[email-masked]>; Lanhao (Lan) <[email-masked]>
主题: Re: [PATCH net-next 1/4] net: hns3: refine the tcam key convert handle

On Tue, Sep 27, 2022 at 07:12:02PM +0800, Guangbin Huang wrote:
> From: Jian Shen <[email-masked]>
> 
> The expression '(k ^ ~v)' is exaclty '(k & v)', and '(k & v) & k' is 
> exaclty 'k & v'. So simplify the expression for tcam key convert.
> 
> It also add necessary brackets for them.
> 
> Signed-off-by: Jian Shen <[email-masked]>
> Signed-off-by: Guangbin Huang <[email-masked]>
> ---
>  .../net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h   | 11 +++--------
>  1 file 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 495b639b0dc2..59bfacc687c9 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> @@ -827,15 +827,10 @@ 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))

Can you please explain why do you need special define for boolean AND?

Thanks

>  
>  #define HCLGE_MAC_STATS_FIELD_OFF(f) (offsetof(struct 
> hclge_mac_stats, f))  #define HCLGE_STATS_READ(p, offset) (*(u64 
> *)((u8 *)(p) + (offset)))
> --
> 2.33.0
>