[ovs-discuss] [ovs-dev] how to get packet information in ovs-dpdk?

[linhaifeng]

You can use dpdk tool 'pdump' to capture packets
http://dpdk.org/doc/guides-16.07/sample_app_ug/pdump.html

在 2017/7/12 16:21, Sam 写道:
> hi all,
>
> I'm running ovs-dpdk(ovs-2.4.9), I found the counter of bond port of br_t
> is increasing, but I want to know what's these packets, how could I do this?
>
> first, I use `ovs-ofctl snoop br_t`, but it quit quickly as below:
>
>> [root at yf-mos-test-net07 ~]# /usr/local/bin/ovs-ofctl snoop
>> /usr/local/var/run/openvswitch/br_t.mgmt
>> [root at yf-mos-test-net07 ~]# /usr/local/bin/ovs-ofctl snoop
>> /usr/local/var/run/openvswitch/br_t.mgmt
>> ovs-ofctl: /usr/local/var/run/openvswitch/ovs-ofctl.pid: already running
>> as pid 22082, aborting
>
> Then I debug ovs-vswitchd use `gdb -p 213214` and set break as below:
>
>> Breakpoint 3, netdev_rxq_recv (rx=0x7f1a5a6ff2c0, buffers=0x7f25e17f9880,
>> cnt=0x7f25e17f987c) at lib/netdev.c:695
>> 695    retval = rx->netdev->netdev_class->rxq_recv(rx, buffers, cnt);
>> (gdb) finish
>> Run till exit from #0  netdev_rxq_recv (rx=0x7f1a5a6ff2c0,
>> buffers=0x7f25e17f9880, cnt=0x7f25e17f987c)
>>     at lib/netdev.c:695
>> 0x000000000055eeec in dp_netdev_process_rxq_port (pmd=0x7f25e80d7010,
>> port=0x1059fd0, rxq=0x7f1a5a6ff2c0)
>>     at lib/dpif-netdev.c:2590
>> 2590    error = netdev_rxq_recv(rxq, packets, &cnt);
>> Value returned is $5 = 11
>> (gdb) p packet
>> No symbol "packet" in current context.
>> (gdb) p p^CQuit
>> (gdb) p cnt
>> $6 = 0
>> (gdb) d
>> Delete all breakpoints? (y or n) y
>> (gdb) b 2593 if cnt!=0
>> Breakpoint 4 at 0x55ef27: file lib/dpif-netdev.c, line 2593.
>> (gdb) c
> but cnt is still 0, which means no packets received.
>
> At last, I use `ovs-appctl vlog/set dpif_netdev dbg`, but the log show
> nothing.
>
> How could I do this? thank you~
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