netdev - Re: macvlan on top mlx4 fails

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Message-ID: <4B62F6FA.9070000@fr.ibm.com>
Date:	Fri, 29 Jan 2010 15:55:54 +0100
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: macvlan on top mlx4 fails

Patrick McHardy wrote:
> Daniel Lezcano wrote:
>> Hi all,
>>
>> I am trying to have a macvlan on top of an ethernet driver infiniband
>> emulation communicating with the macvlan on anoher host with the same
>> configuration. But I am not able to ping them through the ip address
>> assigned to each macvlan.
>>
>> On the host1 (s1):
>>
>> ...
>> s2:~ # ping 1.2.3.5
>> PING 1.2.3.5 (1.2.3.5) 56(84) bytes of data.
>> From 1.2.3.4: icmp_seq=2 Destination Host Unreachable
>> From 1.2.3.4 icmp_seq=2 Destination Host Unreachable
>> From 1.2.3.4 icmp_seq=3 Destination Host Unreachable
>> From 1.2.3.4 icmp_seq=4 Destination Host Unreachable
>> ^C
>> --- 1.2.3.5 ping statistics ---
>> 5 packets transmitted, 0 received, +4 errors, 100% packet loss, time 4010ms
>> , pipe 3
>>
>> The arp cache:
>>
>> Address                  HWtype  HWaddress           Flags Mask    Iface
>> 1.2.3.5                          (incomplete)    mc1
>>
>>
>> When doing a tcpdump on s2 host, I have arp who-as request:
>>
>>
>> 09:14:20.764389 arp who-has 1.2.3.5 tell 1.2.3.4
>> 09:14:20.764394 arp who-has 1.2.3.5 tell 1.2.3.4
>> 09:14:20.764427 arp who-has 1.2.3.5 tell 1.2.3.4
>>
>>
>> But doing the same tcpdump on the s1 host I don't see there arp request.
>>
>> The output of lscpi:
>>
>> s2:~ # lspci
>> 0000:00:01.0 RAID bus controller: IBM Obsidian chipset SCSI controller
>> (rev 02)
>> 0001:00:01.0 USB Controller: NEC Corporation USB (rev 43)
>> 0001:00:01.1 USB Controller: NEC Corporation USB (rev 43)
>> 0001:00:01.2 USB Controller: NEC Corporation USB 2.0 (rev 04)
>> 0002:00:01.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev
>> 02)
>> 0003:01:00.0 InfiniBand: Mellanox Technologies MT25418 [ConnectX IB DDR,
>> PCIe 2.0 2.5GT/s] (rev a0)
>>
>>
>> I am a newbie on infiniband so I was wondering if I did something wrong
>> or if this is unsupported.
> 
> Well, I don't know much about infiniband myself. On which device
> are you running tcpdump? 

I did:

tcpdump -i any arp dst or src 1.2.3.5

In case its the eth-device, does running
> tcpdump directly on top of the ib-devices make any difference?

Yes, right. The arp request are seen on eth1 but not on the ib.

> Perhaps its not properly propagating the promiscous mode flag or
> the secondary unicast addresses.

Is it possible to check that ?

Thanks.
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