netdev - Re: [PATCH bpf-next v6 11/11] bpf: add selftest for tcpbpf

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Date:   Fri, 19 Jan 2018 19:59:45 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Lawrence Brakmo <brakmo@...com>
Cc:     netdev <netdev@...r.kernel.org>, Kernel Team <kernel-team@...com>,
        Blake Matheny <bmatheny@...com>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH bpf-next v6 11/11] bpf: add selftest for tcpbpf

On Fri, Jan 19, 2018 at 05:45:48PM -0800, Lawrence Brakmo wrote:
> Added a selftest for tcpbpf (sock_ops) that checks that the appropriate
> callbacks occured and that it can access tcp_sock fields and that their
> values are correct.
> 
> Run with command: ./test_tcpbpf_user
> 
> Signed-off-by: Lawrence Brakmo <brakmo@...com>
...
> +	__u32 key = 0;
> +	struct tcpbpf_globals g, *gp;
> +
> +	gp = bpf_map_lookup_elem(&global_map, &key);
> +	if (gp == NULL) {
> +		struct tcpbpf_globals g = {0, 0, 0, 0, 0, 0, 0, 0};
> +
> +		g.event_map |= (1 << event);
> +		bpf_map_update_elem(&global_map, &key, &g,
> +			    BPF_ANY);
> +	} else {
> +		g = *gp;
> +		g.event_map |= (1 << event);
> +		bpf_map_update_elem(&global_map, &key, &g,
> +			    BPF_ANY);
...
> +			__u32 key = 0;
> +			struct tcpbpf_globals g, *gp;
> +
> +			gp = bpf_map_lookup_elem(&global_map, &key);
> +			if (!gp)
> +				break;
> +			g = *gp;
> +			g.bad_cb_test_rv = bad_call_rv;
> +			g.good_cb_test_rv = good_call_rv;
> +			bpf_map_update_elem(&global_map, &key, &g,
> +					    BPF_ANY);

since 'g' is an array of one element and the tests designed
for single flow anyway, there is no need to use map_update_elem.
the program can directly assign into fields like:
	gp->bad_cb_test_rv = bad_call_rv;
	gp->good_cb_test_rv = good_call_rv;
probably not worth respining just for that. Mainly fyi.
Acked-by: Alexei Starovoitov <ast@...nel.org>