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	"'Van Haaren, Harry'" <harry.van.haaren@intel.com>
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Subject: [dpdk-users] How to free a rte_mempool buffer
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Hi All,

=20

I test my DPDK program in VM Ubuntu (in VMware) with the two virtual
NICs(VMXNET3 and e1000).

=20

I create a rte_mempool buffer by rte_pktmbuf_pool_create, and load some
packets from a pcap file into this buffer. I can sending these packets =
by
rte_eth_tx_burst successfully.

=20

Now I want to load another pcap file, then I free the previous =
rte_mempool
buffer by rte_mempool_free, and create a new rte_mempool buffer,

But a crash will be occurred at rte_eth_tx_burst Both in VMXNET3 and =
e1000.

=20

I traced the code and found the crash point as below:=20

The VMXNET3 driver: crash at:

vmxnet3_xmit_pkts->vmxnet3_tq_tx_complete->vmxnet3_unmap_pkt->rte_pktmbuf=
_fr
ee(mbuf);  (mbuf =3D txq->cmd_ring.buf_info[eop_idx].m;)

=20

The e1000 driver: crash at:

eth_em_xmit_pkts->rte_pktmbuf_free_seg(txe->mbuf);=20

=20

=20

I think rte_mempool_free side effects the driver=A1=AFs TX ring, but =
don=A1=AFt know
how to fix this issue?

=20

How can we free a rte_mempool buffer safely?

=20

=20

Thanks

=20

Jie

=20