DPDK 22.11 - How to fix memory leak for KNI - How to debug

[Yasin CANER <yasin.caner@ulakhaberlesme.com.tr>]

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Hello all,

I think there is a memory leak for KNI.

Firstly, try to active trace modüle to follow memory management but could not. İt doesn't create file and dont have any clue.

Run Command : -c dpdk_core_mask -d librte_net_virtio.so -d librte_mbuf.so -d librte_mempool.so -d librte_mempool_ring.so -d librte_mempool_stack.so -d librte_mempool_bucket.so -d librte_kni.so --log-level lib.kni:debug --log-level lib.eal:debug --log-level lib.ethdev:debug --trace=kni --trace-dir=/tmp/


Secondly, I used followed functions.

``code
  used_mpool  = rte_mempool_in_use_count(rdpdk_cfg->mbuf_pool);
  count_mpool = rte_mempool_avail_count(rdpdk_cfg->mbuf_pool);
``

After calling function rte_kni_rx_burst, 32 unit is allocated. Then i force to free message_buf (mbuf). It frees 1 unit. 31 units left in memory!


How to fix or understand this issue.
Follow logs,




  1.  (59383)  6:55:10    lrtc():3212> [KNI]Picked up 1 packets from port 0 [KNI:F000]   --> 1 packet is received from Kernel that is allocate 32 unit
  2.  (59383)  6:55:10   print_mempool_tx():2511> [UseCount_mpool:468][avail_mpool:9931]
  3.  (59383)  6:55:10    pkni():2536> [KNI] i:0/1
  4.  (59383)  6:55:10    pkni():2616> [KNI][EGR]  P:[IPv6]  P:[0] [fe80::f816:3eff:fe93:f5fd]->[ff02::2] --> Packet is a broadcast packet IPv6
  5.  (59383)  6:55:10    pkni():2620> [KNI][EGR][pkt-len:70]
  6.  (59383)  6:55:10   print_mempool_tx():2511> [UseCount_mpool:467][avail_mpool:9932] --> mbuf is freed to understand mem-leak. İt is same happens after calling rte_eth_tx_burst
  7.  (59383)  6:55:10    lrtc():3212> [KNI]Picked up 1 packets from port 1 [KNI:F000] --> 1 packet is received from Kernel that is allocate 32 unit 9932 to 9900 then same process happens and 31 units is not freed.
  8.  (59383)  6:55:10   print_mempool_tx():2511> [UseCount_mpool:499][avail_mpool:9900]
  9.  (59383)  6:55:10    pkni():2536> [KNI] i:0/1
  10. (59383)  6:55:10    pkni():2616> [KNI][EGR]  P:[IPv6]    P:[1] [fe80::f816:3eff:fed2:9101]->[ff02::2]
  11. (59383)  6:55:10    pkni():2620> [KNI][EGR][pkt-len:70]
  12. (59383)  6:55:10   print_mempool_tx():2511> [UseCount_mpool:498][avail_mpool:9901]


Kernel : 5.4.0-146-generic #163-Ubuntu SMP Fri Mar 17 18:26:02 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 20.04
DPDK dpdk-stable-22.11.1
İgb_uio is used.

Best regards.
___
Yasin CANER
Lider Mühendis
Ulak Haberleşme A.Ş. Ankara


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