netdev - Re: [PATCH bpf-next v2] samples/bpf: xdp_redirect_cpu: set MAX_CPUS according to NR

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Date:   Thu, 14 May 2020 18:27:41 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        lorenzo.bianconi@...hat.com
Subject: Re: [PATCH bpf-next v2] samples/bpf: xdp_redirect_cpu: set MAX_CPUS
 according to NR_CPUS

On Tue, May 12, 2020 at 10:03 AM Yonghong Song <yhs@...com> wrote:
>
>
>
> On 5/12/20 9:30 AM, Lorenzo Bianconi wrote:
> > xdp_redirect_cpu is currently failing in bpf_prog_load_xattr()
> > allocating cpu_map map if CONFIG_NR_CPUS is less than 64 since
> > cpu_map_alloc() requires max_entries to be less than NR_CPUS.
> > Set cpu_map max_entries according to NR_CPUS in xdp_redirect_cpu_kern.c
> > and get currently running cpus in xdp_redirect_cpu_user.c
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
>
> Acked-by: Yonghong Song <yhs@...com>

Applied. Thanks