netdev - Re: [PATCH net-next v8 09/15] p4tc: add template pipeline create, get, update, delete

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Date: Thu, 16 Nov 2023 17:11:04 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: netdev@...r.kernel.org, deb.chatterjee@...el.com,
	anjali.singhai@...el.com, namrata.limaye@...el.com, tom@...anda.io,
	mleitner@...hat.com, Mahesh.Shirshyad@....com,
	tomasz.osinski@...el.com, xiyou.wangcong@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, vladbu@...dia.com, horms@...nel.org,
	daniel@...earbox.net, bpf@...r.kernel.org, khalidm@...dia.com,
	toke@...hat.com, mattyk@...dia.com
Subject: Re: [PATCH net-next v8 09/15] p4tc: add template pipeline create,
 get, update, delete

Thu, Nov 16, 2023 at 03:59:42PM CET, jhs@...atatu.com wrote:

[...]


>diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h
>index ba32dba66..4d33f44c1 100644
>--- a/include/uapi/linux/p4tc.h
>+++ b/include/uapi/linux/p4tc.h
>@@ -2,8 +2,71 @@
> #ifndef __LINUX_P4TC_H
> #define __LINUX_P4TC_H
> 
>+#include <linux/types.h>
>+#include <linux/pkt_sched.h>
>+
>+/* pipeline header */
>+struct p4tcmsg {
>+	__u32 pipeid;
>+	__u32 obj;
>+};

I don't follow. Is there any sane reason to use header instead of normal
netlink attribute? Moveover, you extend the existing RT netlink with
a huge amout of p4 things. Isn't this the good time to finally introduce
generic netlink TC family with proper yaml spec with all the benefits it
brings and implement p4 tc uapi there? Please?


>+
>+#define P4TC_MAXPIPELINE_COUNT 32
>+#define P4TC_MAXTABLES_COUNT 32
>+#define P4TC_MINTABLES_COUNT 0
>+#define P4TC_MSGBATCH_SIZE 16
>+
> #define P4TC_MAX_KEYSZ 512
> 
>+#define TEMPLATENAMSZ 32
>+#define PIPELINENAMSIZ TEMPLATENAMSZ

ugh. A prefix please?

pw-bot: cr

[...]