[dpdk-dev] Segmentation fault when creating a hash table in the example of pipeline (ROUTING type)

[dpdk-dev] Segmentation fault when creating a hash table in the example of pipeline (ROUTING type)

[Victor Huertas]

Hi all,

I have tried to run the pipeline example with a ROUTING pipeline where I
configured n_arp_entries=8 as well as the arp_key_offset = 192.

It compiles perfectly but when it reaches the line where the
rte_pipeline_table_create is (see below a fragment of the source code of
the pipeline_routing_init function at pipeline_routing.be.cpp file) it
always crashes with a segmentation fault at the
rte_table_hash_create_key8_ext() function.

I am completely stuck due to this issue. Has some bug being declared
regarding this table creation function?


/* ARP table configuration */
    if (p_rt->params.n_arp_entries) {

        struct rte_table_hash_key8_ext_params table_arp_params;
        table_arp_params.n_entries = p_rt->params.n_arp_entries;
        table_arp_params.n_entries_ext = p_rt->params.n_arp_entries;
        table_arp_params.f_hash = hash_default_key8;
        table_arp_params.seed = 0;
        table_arp_params.signature_offset = 0; /* Unused */
        table_arp_params.key_offset = p_rt->params.arp_key_offset;


        struct rte_pipeline_table_params table_params = {
            .ops = &rte_table_hash_key8_ext_dosig_ops,
            .arg_create = &table_arp_params,
            .f_action_hit = get_arp_table_ah_hit(p_rt),
            .f_action_miss = NULL,
            .arg_ah = p_rt,
            .action_data_size = sizeof(struct arp_table_entry) -
                sizeof(struct rte_pipeline_table_entry),
        };

        int status;

        status = rte_pipeline_table_create(p->p,
            &table_params,
            &p->table_id[1]);

        if (status) {
            rte_pipeline_free(p->p);
            rte_free(p);
            return NULL;
        }

        p->n_tables++;
    }

Thanks

-- 
Victor

Re: [dpdk-dev] Segmentation fault when creating a hash table in the example of pipeline (ROUTING type)

[Shyam Shrivastav]

I have been using librte_pipeline, librte_table though only acl and
hash_key16 part, and firewall part of ip_pipeline in my project for quite
sometime. I have never used or worked on other parts of ip_pipeline app
like routing.
Obviously issue is due to bad memory access at some point. Here are my
steps if it helps.
If unable to figure out , I usually replace -O3 with -g (that is enable
debugging symbols and disable optimization) in makefiles of these two
libraries and compile them. Then do the same thing with ip_pipeline
makefile and compile. And thats it use gdb and you can get the exact
culprit line

On Thu, Apr 19, 2018 at 6:03 PM, Victor Huertas <vhuertas@gmail.com> wrote:

> Hi all,
>
> I have tried to run the pipeline example with a ROUTING pipeline where I
> configured n_arp_entries=8 as well as the arp_key_offset = 192.
>
> It compiles perfectly but when it reaches the line where the
> rte_pipeline_table_create is (see below a fragment of the source code of
> the pipeline_routing_init function at pipeline_routing.be.cpp file) it
> always crashes with a segmentation fault at the
> rte_table_hash_create_key8_ext() function.
>
> I am completely stuck due to this issue. Has some bug being declared
> regarding this table creation function?
>
>
> /* ARP table configuration */
>     if (p_rt->params.n_arp_entries) {
>
>         struct rte_table_hash_key8_ext_params table_arp_params;
>         table_arp_params.n_entries = p_rt->params.n_arp_entries;
>         table_arp_params.n_entries_ext = p_rt->params.n_arp_entries;
>         table_arp_params.f_hash = hash_default_key8;
>         table_arp_params.seed = 0;
>         table_arp_params.signature_offset = 0; /* Unused */
>         table_arp_params.key_offset = p_rt->params.arp_key_offset;
>
>
>         struct rte_pipeline_table_params table_params = {
>             .ops = &rte_table_hash_key8_ext_dosig_ops,
>             .arg_create = &table_arp_params,
>             .f_action_hit = get_arp_table_ah_hit(p_rt),
>             .f_action_miss = NULL,
>             .arg_ah = p_rt,
>             .action_data_size = sizeof(struct arp_table_entry) -
>                 sizeof(struct rte_pipeline_table_entry),
>         };
>
>         int status;
>
>         status = rte_pipeline_table_create(p->p,
>             &table_params,
>             &p->table_id[1]);
>
>         if (status) {
>             rte_pipeline_free(p->p);
>             rte_free(p);
>             return NULL;
>         }
>
>         p->n_tables++;
>     }
>
> Thanks
>
> --
> Victor
>