netdev - Re: [PATCH net-next v4 1/2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Wed, 19 Apr 2017 15:05:07 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Roman Mashak <mrv@...atatu.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, davem@...emloft.net,
        netdev@...r.kernel.org, eric.dumazet@...il.com,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next v4 1/2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

Wed, Apr 19, 2017 at 02:55:57PM CEST, mrv@...atatu.com wrote:
>Jiri Pirko <jiri@...nulli.us> writes:
>
>
>[...]
>
>>>+enum {
>>>+	TCAA_UNSPEC,
>>>+	TCAA_ACT_TAB,
>>>+	TCAA_ACT_FLAGS,
>>>+	TCAA_ACT_COUNT,
>>>+	__TCAA_MAX
>>>+};
>>>+
>>>+#define TCAA_MAX (__TCAA_MAX - 1)
>>> #define TA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcamsg))))
>>> #define TA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcamsg))
>>>-#define TCA_ACT_TAB 1 /* attr type must be >=1 */	
>>>-#define TCAA_MAX 1
>>>+#define TCA_ACT_TAB TCAA_ACT_TAB
>>
>> This is mess. What does "TCAA" stand for?
>> I suggest some more meaningful naming of the enum items and define
>> TCA_ACT_TAB and TCAA_MAX to the new values in order to maintain UAPI
>> Also, please put X_MAX = __X_MAX - 1 into enum
>>
>
>Notation observed in tc and unfortunately not consistently maintained is
>to have enum with TCA* attributes for instance, followed by define,
>outside of the enum, with __X_MAX -1

I don't have strong opinion on define or in-enum. I like in-enum better.
The rest could be converted later on.