[dpdk-dev] rte_hash thread safe

[Wang, Yipeng1]

Hi, Brijesh and all,

Thanks for bringing this up. We actually have a read-write concurrency support patch coming in a couple of weeks for rte_hash aiming this release.  More changes are on the way for future releases. :)

Thanks
Yipeng 

>-----Original Message-----
>From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Brijesh Singh
>Sent: Wednesday, April 11, 2018 9:12 PM
>To: dev at dpdk.org
>Subject: [dpdk-dev] rte_hash thread safe
>
>Hello,
>
>I  want to use DPDK's rte_hash library to keep track of tcp flows. The
>lookups will be done by multiple threads but inserts will be done only
>on one thread.
>
>As per the documentation rte_hash library has thread safe lookups. Key
>/data inserts should be done on single thread, since those operations
>are not thread safe. Is this documentation still correct?
>
>The lookup code compares the key and returns the data if the key
>matches, this doesn't look like thread safe. Am I missing something?
>
>_rte_hash_lookup_with_hash(const struct rte_hash *h, const void *key,
>
>                                        hash_sig_t sig, void **data)
>
>{
>
>
>
>…
>
>                        if (rte_hash_cmp_eq(key, k->key, h) == 0) {
>
>                                if (data != NULL)
>
>                                        *data = k->pdata;
>
>}
>
>Regards,
>Brijesh