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From: Ali Volkan Atli <Volkan.Atli@argela.com.tr>
To: "users@dpdk.org" <users@dpdk.org>
CC: Ali Volkan Atli <Volkan.Atli@argela.com.tr>
Thread-Topic: L3 Forwarding Exact Match Timeout
Thread-Index: AQHTsSxkfgwLVc6xYE6rWBLxzHKr8w==
Date: Thu, 1 Mar 2018 08:05:14 +0000
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Subject: [dpdk-users] L3 Forwarding Exact Match Timeout
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Hi=20

I'm trying to understand l3fwd application for exact match case. It only ad=
ds keys into hash but never deletes them. So I just want to delete entries =
according to a timeout by iterating through the hash table. But I have many=
 entries and I don't want to iterate the hash table in a lump, I need to sw=
eep it piece by piece in another thread during adding continuing. So does t=
he following pseudo code work in multithread cases?

adding_thread
{
    while (1) {
        ...
        rte_hash_add_key_data(handle, key, data); // data has a last_seen t=
imeout
        ...
    }
}

sweeping_thread
{
    static uint32_t sweep_iter =3D 0;
    const void *next_key;
    void *next_data;

    for (int i =3D 0; i < SWEEP_CNT; ++i) {
        ...
        rte_hash_iterate(handle, &next_key, &next_data, &sweep_iter)
        sweep_iter =3D (sweep_iter + 1) & HASH_MASK
        if (current_time - next_data->timeout > TIMEOUT)
            rte_hash_del_key(handle, (void *)&next_key);
        ...
    }
}


Thanks in advance.

- Volkan=