[dpdk-users] rte_hash_hash in DPDK2.0

[dpdk-users] rte_hash_hash in DPDK2.0

[Bar, Nir]

Hi,

Why rte_has_hash() in DPDK-2.0 isn't multi thread safe?

It only calculates hash.

Thanks,
Nir


**
* Calc a hash value by key. This operation is not multi-process safe.
*
* @param h
*   Hash table to look in.
* @param key
*   Key to find.
* @return
*   - hash value
*/
static inline hash_sig_t
rte_hash_hash(const struct rte_hash *h, const void *key)
{
               /* calc hash result by key */
               return h->hash_func(key, h->key_len, h->hash_func_init_val);
}

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Re: [dpdk-users] rte_hash_hash in DPDK2.0

[De Lara Guarch, Pablo]

Hi Nir,


> -----Original Message-----
> From: users [mailto:users-bounces@dpdk.org] On Behalf Of Bar, Nir
> Sent: Wednesday, February 08, 2017 10:55 AM
> To: users@dpdk.org
> Subject: [dpdk-users] rte_hash_hash in DPDK2.0
> 
> Hi,
> 
> Why rte_has_hash() in DPDK-2.0 isn't multi thread safe?
> 
> It only calculates hash.
> 

Rte_hash_hash is multi-thread safe, but not multi-process safe, as it uses a function pointer to get the actual hash function.

Thanks,
Pablo
> Thanks,
> Nir
> 
> 
> **
> * Calc a hash value by key. This operation is not multi-process safe.
> *
> * @param h
> *   Hash table to look in.
> * @param key
> *   Key to find.
> * @return
> *   - hash value
> */
> static inline hash_sig_t
> rte_hash_hash(const struct rte_hash *h, const void *key)
> {
>                /* calc hash result by key */
>                return h->hash_func(key, h->key_len, h->hash_func_init_val);
> }
> 
> --
> This electronic message may contain proprietary and confidential
> information of Verint Systems Inc., its affiliates and/or subsidiaries.
> The information is intended to be for the use of the individual(s) or
> entity(ies) named above. If you are not the intended recipient (or
> authorized to receive this e-mail for the intended recipient), you may not
> use, copy, disclose or distribute to anyone this message or any information
> contained in this message. If you have received this electronic message in
> error, please notify us by replying to this e-mail.