[dpdk-users] Issue in freeing and recreating mempools for Transmission

Karthikraj palanichamy karthikraj.palanichamy at veryxtech.com
Fri Feb 17 11:14:14 CET 2017


I am using dpdk to develop a traffic generator (both rx and tx).

At the start, I will create a memory pool for Rx with default data room 

For Tx, I will dynamically create memory pool based on the frame size to 
be transmitted.

To transmit 80 bytes frames, I configured (80 +/RTE_PKTMBUF_HEADROOM/). 
There was no problem and transmission was successful.

I will do `rte_mempool_free()` once the transmission is over.

I will again create mem pool when transmission is again set ON.

So, my code flow is /: create mempool -> transmit pkts -> free mempool/

When I repeat this for 3 to 5 times, I get segmentation fault in the 
transmission API of the PMD. - 'eth_igb_xmit_pkts' for igb PMD and  
'ixgbe_xmit_pkts_vec()' for ixgbe PMD.

When I do /`rte_eth_dev_close()`/ and `rte_eth_dev_start()` after 
freeing the mem pool, everything works fine.

But I couldn't afford to do `rte_eth_dev_close()` since Rx will be 
running in parallel and Rx shouldn't be stopped.

I tried `rte_eth_dev_tx_queue_stop()` but issue persists.

Thanks in advance for any help.


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