netdev - Re: [bpf-next PATCH 03/10] bpf: selftests, sockmap test prog run without setting cgroup

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Date:   Thu, 07 May 2020 11:10:25 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>,
        John Fastabend <john.fastabend@...il.com>
Cc:     lmb@...udflare.com, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org, ast@...nel.org
Subject: Re: [bpf-next PATCH 03/10] bpf: selftests, sockmap test prog run
 without setting cgroup

Jakub Sitnicki wrote:
> On Tue, 05 May 2020 13:50:35 -0700
> John Fastabend <john.fastabend@...il.com> wrote:
> 
> > Running test_sockmap with arguments to specify a test pattern requires
> > including a cgroup argument. Instead of requiring this if the option is
> > not provided create one
> > 
> > This is not used by selftest runs but I use it when I want to test a
> > specific test. Most useful when developing new code and/or tests.
> > 
> > Signed-off-by: John Fastabend <john.fastabend@...il.com>
> > ---

[...]

> >  	if (!cg_fd) {
> > -		fprintf(stderr, "%s requires cgroup option: --cgroup <path>\n",
> > -			argv[0]);
> > -		return -1;
> > +		if (setup_cgroup_environment()) {
> > +			fprintf(stderr, "ERROR: cgroup env failed\n");
> > +			return -EINVAL;
> > +		}
> > +
> > +		cg_fd = create_and_get_cgroup(CG_PATH);
> > +		if (cg_fd < 0) {
> > +			fprintf(stderr,
> > +				"ERROR: (%i) open cg path failed: %s\n",
> > +				cg_fd, optarg);
> 
> Looks like you wanted to log strerror(errno) instead of optarg here.
> 
> > +			return cg_fd;
> > +		}

cut'n'paste error thanks.