netdev - Re: [PATCH bpf-next 04/17] selftests: xsk: set rlimit per thread

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Date:   Wed, 28 Jul 2021 08:13:53 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Ciara Loftus <ciara.loftus@...el.com>,
        Jussi Maki <joamaki@...il.com>, bpf <bpf@...r.kernel.org>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next 04/17] selftests: xsk: set rlimit per thread

On Tue, Jul 27, 2021 at 8:39 PM Yonghong Song <yhs@...com> wrote:
>
>
>
> On 7/27/21 6:17 AM, Magnus Karlsson wrote:
> > From: Magnus Karlsson <magnus.karlsson@...el.com>
> >
> > Set rlimit per thread instead of on the main thread. The main thread
> > does not register any umem area so do not need this.
>
> I think setrlimit() is per process. Did I miss anything?

No, you are correct. I must have gotten confused by the heat or
something. Will remove this patch from the set.

Thanks!

> >
> > Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> > ---
> >   tools/testing/selftests/bpf/xdpxceiver.c | 9 +++++----
> >   1 file changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
> > index 4d8ee636fc24..2100ab4e58b7 100644
> > --- a/tools/testing/selftests/bpf/xdpxceiver.c
> > +++ b/tools/testing/selftests/bpf/xdpxceiver.c
> > @@ -252,6 +252,7 @@ static void gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
> >
> >   static void xsk_configure_umem(struct ifobject *data, void *buffer, int idx)
> >   {
> > +     const struct rlimit _rlim = { RLIM_INFINITY, RLIM_INFINITY };
> >       struct xsk_umem_config cfg = {
> >               .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
> >               .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
> > @@ -263,6 +264,10 @@ static void xsk_configure_umem(struct ifobject *data, void *buffer, int idx)
> >       struct xsk_umem_info *umem;
> >       int ret;
> >
> > +     ret = XSK_UMEM__DEFAULT_FRAME_SIZE;
> > +     if (setrlimit(RLIMIT_MEMLOCK, &_rlim))
> > +             exit_with_error(errno);
> > +
> >       umem = calloc(1, sizeof(struct xsk_umem_info));
> >       if (!umem)
> >               exit_with_error(errno);
> > @@ -1088,13 +1093,9 @@ static void run_pkt_test(int mode, int type)
> >
> >   int main(int argc, char **argv)
> >   {
> > -     struct rlimit _rlim = { RLIM_INFINITY, RLIM_INFINITY };
> >       bool failure = false;
> >       int i, j;
> >
> > -     if (setrlimit(RLIMIT_MEMLOCK, &_rlim))
> > -             exit_with_error(errno);
> > -
> >       for (int i = 0; i < MAX_INTERFACES; i++) {
> >               ifdict[i] = malloc(sizeof(struct ifobject));
> >               if (!ifdict[i])
> >