linux-kernel - Re: [PATCH v12 net-next 04/11] bpf: expand BPF syscall with program load/unload

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Message-Id: <20140916.151711.203074982751372582.davem@davemloft.net>
Date:	Tue, 16 Sep 2014 15:17:11 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	mingo@...nel.org, torvalds@...ux-foundation.org,
	luto@...capital.net, dborkman@...hat.com,
	hannes@...essinduktion.org, chema@...gle.com, edumazet@...gle.com,
	a.p.zijlstra@...llo.nl, pablo@...filter.org, hpa@...or.com,
	akpm@...ux-foundation.org, keescook@...omium.org,
	linux-api@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 net-next 04/11] bpf: expand BPF syscall with
 program load/unload

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Mon, 15 Sep 2014 12:18:34 -0700

> @@ -121,6 +132,21 @@ union bpf_attr {
>  			void __user *next_key;
>  		};
>  	};
> +
> +	struct { /* anonymous struct used by BPF_PROG_LOAD command */
> +		__u32 prog_type;	/* one of enum bpf_prog_type */
> +		__u32 insn_cnt;
> +		const struct bpf_insn __user *insns;
> +		const char __user *license;
> +	};
> +};

Again, these need syscall compat handling.  You may want to redesign
the types so that perhaps no compat layer translations will be needed.
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