linux-kernel - Re: [RFC PATCH v3 23/37] bpf tools: Introduce bpf_load

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Message-ID: <555A350B.1030107@plumgrid.com>
Date:	Mon, 18 May 2015 11:52:59 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Wang Nan <wangnan0@...wei.com>, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, acme@...nel.org,
	namhyung@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	daniel@...earbox.net, brendan.d.gregg@...il.com,
	masami.hiramatsu.pt@...achi.com
CC:	lizefan@...wei.com, linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH v3 23/37] bpf tools: Introduce bpf_load_program()
 to bpf.c

On 5/17/15 3:56 AM, Wang Nan wrote:
> bpf_load_program() can be used to load bpf program into kernel. To make
> loading faster, first try to load without logbuf. Try again with logbuf
> if the first try failed.
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
...
> +	attr.insn_cnt = (__u32)insns_cnt;
> +	attr.insns = ptr_to_u64((void *) insns);
> +	attr.license = ptr_to_u64((void *) license);

unnecessary casts?

> +	attr.log_buf = ptr_to_u64(NULL);
> +	attr.log_size = 0;
> +	attr.log_level = 0;
> +	attr.kern_version = kern_version;
> +
> +	fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
> +	if ((fd >= 0) || !log_buf || !log_buf_sz)

unnecessary ()

> +		return fd;
> +
> +	/* Try again with log */
> +	attr.log_buf = ptr_to_u64(log_buf);
> +	attr.log_size = log_buf_sz;
> +	attr.log_level = 1;
> +	log_buf[0] = 0;
> +	return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));

this part looks good. thank you for addressing the feedback from v1.

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