linux-kernel - Re: [PATCH v3 perf,bpf 06/11] perf, bpf: save bpf_prog

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Date:   Mon, 18 Feb 2019 00:05:32 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, daniel@...earbox.net, kernel-team@...com,
        peterz@...radead.org, acme@...hat.com, jolsa@...nel.org,
        namhyung@...nel.org
Subject: Re: [PATCH v3 perf,bpf 06/11] perf, bpf: save bpf_prog_info
 information as headers to perf.data

On Fri, Feb 15, 2019 at 01:53:49PM -0800, Song Liu wrote:

SNIP

> +static int process_bpf_prog_info(struct feat_fd *ff,
> +				 void *data __maybe_unused)
> +{
> +	struct bpf_prog_info_linear *info_linear;
> +	struct bpf_prog_info_node *info_node;
> +	struct perf_env *env = &ff->ph->env;
> +	u32 count, i;
> +	int err = -1;
> +
> +	if (do_read_u32(ff, &count))
> +		return -1;
> +
> +	down_write(&env->bpf_progs.bpf_info_lock);
> +
> +	for (i = 0; i < count; ++i) {
> +		u32 info_len, data_len;
> +
> +		info_linear = NULL;
> +		info_node = NULL;
> +		if (do_read_u32(ff, &info_len))
> +			goto out;
> +		if (do_read_u32(ff, &data_len))
> +			goto out;
> +
> +		if (info_len > sizeof(struct bpf_prog_info)) {
> +			pr_warning("detected invalid bpf_prog_info\n");
> +			goto out;
> +		}
> +
> +		info_linear = malloc(sizeof(struct bpf_prog_info_linear) +
> +				     data_len);
> +		if (!info_linear)
> +			goto out;
> +		info_linear->info_len = sizeof(struct bpf_prog_info);
> +		info_linear->data_len = data_len;
> +		if (do_read_u64(ff, (u64 *)(&info_linear->arrays)))
> +			goto out;
> +		if (__do_read(ff, &info_linear->info, info_len))
> +			goto out;

hum, hows the endianity swap handled for struct bpf_prog_info?

> +		if (info_len < sizeof(struct bpf_prog_info))
> +			memset(((void *)(&info_linear->info)) + info_len, 0,
> +			       sizeof(struct bpf_prog_info) - info_len);
> +
> +		if (__do_read(ff, info_linear->data, data_len))
> +			goto out;

and the data?

thanks,
jirka