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From: Victor Detoni <victordetoni@gmail.com>
Date: Mon, 27 Mar 2017 17:21:58 -0300
Message-ID: <CANpwN=viEWVPifcr2FPx=VfLSWf_o=Cbuyvd+LAbtpjkAh+=xA@mail.gmail.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
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Subject: Re: [dpdk-users] [dpdk-dev] Segm fault to the update acl context
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Hi Konstantin,

Thank you for your questions. Please find below a sample of my code:

After the program has started, I send sighup signals to update the acl
context, like this:

if (signup == SIGHUP)
  use_acl_ctx_swap = 1;
...
During the SIGHUP processes I create a new/swap acl ctx and data structures
using the app_acl_init, add_rules and setup_acl functions
...

main_loop()
...
if (use_acl_ctx_swap) {
   if (acl_search.num_ipv4) {
      rte_acl_classify(
         acl_config.swap_acx_ipv4[socketid], //use swap acl ctx
         acl_search.data_ipv4,
         acl_search.res_ipv4,
         acl_search.num_ipv4,
         DEFAULT_MAX_CATEGORIES);

         send_packets(acl_search.m_ipv4,
            acl_search.res_ipv4,
            acl_search.num_ipv4);

} else {
   if (acl_search.num_ipv4) {
      rte_acl_classify(
         acl_config.acx_ipv4[socketid],
         acl_search.data_ipv4,
         acl_search.res_ipv4,
         acl_search.num_ipv4,
         DEFAULT_MAX_CATEGORIES);

         send_packets(acl_search.m_ipv4,
            acl_search.res_ipv4,
            acl_search.num_ipv4);
   }
}

When I update the acl ctx, rarely the program doesn't crash, mainly when I
just increase de rules. Is there a another way to add new/remove rules in
the acl ctx instead of sighup or control variables?

thanks
Victor

On Mon, Mar 27, 2017 at 6:23 AM, Ananyev, Konstantin <
konstantin.ananyev@intel.com> wrote:

> Hi Victor,
>
> > hello,
> >
> > I'm running l3fwd-acl example as a daemon and trying to update acl
> context
> > with as a "swap" acl context, but the program stops with a segment fault
> > statement. Even using variables to direct which acl context the main loop
> > has to use, the program breaks.
> >
> > I have noticed that even when I update only the swap acl context, the acl
> > structures are updated and the segment fault also happens.
> >
> > please, someone knows why this segment fault?
>
> As I remembers, l3fwd-acl doesn't support updating ACL ctx on the fly.
> Could you explain a bit more what are you trying to do, or even better
> provide some code example to reproduce the issue?
>
> Konstantin
>
>