* [dpdk-users] How to getting first objects from a rte_mempool buffer every time?
@ 2019-03-20 10:44 宋捷
2019-03-20 11:57 ` Van Haaren, Harry
0 siblings, 1 reply; 2+ messages in thread
From: 宋捷 @ 2019-03-20 10:44 UTC (permalink / raw)
To: users
Hi all,
I have a pcap file that contained 100 IP packets. I can send them by DPDK by
below steps:
1. I create a rte_mempool buffer by rte_pktmbuf_pool_create. load these
100 packets into this buffer.
2. call rte_mempool_get_bulk to getting packets form rte_mempool buffer
into rte_mbuf buffer,
3. put rte_mbuf buffer into rte_eth_tx_burst for sending .
The pcap packets can be sent out from 1 to 100 Ok.
Now I want to send the only first 10 packets every time,
rte_mempool_get_bulk can get 1-10 objects, but next time it will get 11-20
objects.
I don’t know if there is easy way to getting first 10 objects from
rte_mempool buffer every time?
Thanks
Jie
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dpdk-users] How to getting first objects from a rte_mempool buffer every time?
2019-03-20 10:44 [dpdk-users] How to getting first objects from a rte_mempool buffer every time? 宋捷
@ 2019-03-20 11:57 ` Van Haaren, Harry
0 siblings, 0 replies; 2+ messages in thread
From: Van Haaren, Harry @ 2019-03-20 11:57 UTC (permalink / raw)
To: songj, users
> -----Original Message-----
> From: users [mailto:users-bounces@dpdk.org] On Behalf Of ??
> Sent: Wednesday, March 20, 2019 10:45 AM
> To: users@dpdk.org
> Subject: [dpdk-users] How to getting first objects from a rte_mempool buffer
> every time?
>
> Hi all,
Hi Jie,
> I have a pcap file that contained 100 IP packets. I can send them by DPDK by
> below steps:
>
> 1. I create a rte_mempool buffer by rte_pktmbuf_pool_create. load these
> 100 packets into this buffer.
>
> 2. call rte_mempool_get_bulk to getting packets form rte_mempool buffer
> into rte_mbuf buffer,
>
> 3. put rte_mbuf buffer into rte_eth_tx_burst for sending .
>
> The pcap packets can be sent out from 1 to 100 Ok.
>
> Now I want to send the only first 10 packets every time,
>
> rte_mempool_get_bulk can get 1-10 objects, but next time it will get 11-20
> objects.
>
> I don’t know if there is easy way to getting first 10 objects from
> rte_mempool buffer every time?
The mempool data-structure is not designed for this usage.
If you require the first 10 items, I recommend dequeueing them from the
mempool once (as you have described above), and then caching them in another
data-structure to "loop" over them.
Typically an rte_ring would work well here, with the 10 items being dequeued
and re-enqueued over-and-over again to loop.
Note; when sending an mbuf via Ethdev, the refcount will be decremented,
and possibly the mbuf will be free()-ed and returned to the mempool.
If you wish to "keep" the mbuf in the rte_ring cache, consider incrementing
the refcount of the mbuf every time before you TX it - the result will be that
the mbuf is not freed back to the mempool, and remain valid to TX again.
> Thanks
> Jie
Hope that helps! -Harry
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