[dpdk-dev] KNI crashes when invalid lldp frames are received

[laxmi.priya at wipro.com]

Hi,


We are using OVS 2.4 with DPDK 2.0 with  kernel 3.18.22. Default flow rules i.e NORMAL rules are there.KNI port is a member port of the ovs bridge

We are using Openmul controller and when invoke the set-controller command i.e ovs-vsctl --no-wait set-controller br0  tcp:127.0.0.1:6653, kni crashes with the below stack


<4>Stack:
<4> ffff880153937d48 ffff880153937d50 ffff880150814000 0000000000000001
<4> 000000002138f240 ffffffff810cf36b ffff880153937df8 ffffffff82055980
<4> 0000000100250151 0000000000000282 ffff880153937da8 ffffffff810d042f
<4>Call Trace:
<4> [<ffffffff810cf36b>] ? lock_timer_base.isra.35+0x2b/0x50
<4> [<ffffffff810d042f>] ? try_to_del_timer_sync+0x4f/0x70
<4> [<ffffffff810d04a2>] ? del_timer_sync+0x52/0x60
<4> [<ffffffff81653bb6>] ? schedule_timeout+0x166/0x290
<4> [<ffffffff810cf240>] ? internal_add_timer+0x80/0x80
<4> [<ffffffffa041743f>] kni_net_rx+0xf/0x20 [rte_kni]
<4> [<ffffffffa041577e>] kni_thread_single+0x5e/0xb0 [rte_kni]
<4> [<ffffffffa0415720>] ? kni_release+0x100/0x100 [rte_kni]
<4> [<ffffffff81089bc9>] kthread+0xc9/0xe0
<4> [<ffffffff81089b00>] ? kthread_create_on_node+0x180/0x180
<4> [<ffffffff81654f18>] ret_from_fork+0x58/0x90
<4> [<ffffffff81089b00>] ? k:q+0x180/0x180
<4>Code: 48 89 85 b8 fe ff ff eb 0c 0f 1f 44 00 00 48 8b 13 48 83 c3 08 49 8b 8d a8 01 00 00 4d

8b b5 a0 01 00 00 31 ff 48 29 ca 4c 01 f2 <44> 0f b7 62 22 0f b7 42 12 48 03 02 ba 20 00 00 00

45 0f b7 cc
<1>RIP  [<ffffffffa0416905>] kni_net_rx_normal+0x145/0x2c0 [rte_kni]
<4> RSP <ffff880153937d28>
<4>---[ end trace 8a2acec3270c7c4b ]---



During debugging we could see that the lldp frames are transmitted on the bridge ports whenever the controller is attached .

But those lldp frames were invalid and had the data_offset of the struct rte_mbuf packets set to 2.

Normal packets if we check could see that the data offset is equal to RTE_PKTMBUF_HEADROOM ( i.e 128. )

Is there any limitation in KNI that the packet data offset should be equal to or greater than RTE_PKTMBUF_HEADROOM



Regards

Laxmi

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