Re: cxgbe netmap promiscuous mode?

[Joe Jones]

Hi Navdeep

running "ifconfig up" and then "ifconfig promisc" works. Running 
"ifconfig promisc" and then "ifconfig up" does not work. Running 
"ifconfig up promisc" together does work. Running "ifconfig promisc up" 
does not work.

The combination that does not work leaves the interface in a state where 
it reports it's self as being in promiscuous mode.

Joe Jones

On 14/04/17 17:32, Navdeep Parhar wrote:
On Fri, Apr 14, 2017 at 04:10:59PM +0100, Joe Jones wrote:
Hi Navdeep,

I think I have found a driver bug. Earlier today I set up the switch I'm
using so that two of the ports mirror the traffic on one of the other ports.
We are planning on using a similar setup to allow packet tracing without
stressing the boxes our application is running on any more then they are
already.

I connected both ports to one of our cxgbe cards, My intention was to use
tcpdump to check that my switch config was doing what I thought it should. I
ran

ifconfig cxl? promisc -vlanhwtag up
Does the problem occur only if you use this form of ifconfig?  Can you
please try "ifconfig up" and "ifconfig cxl? promisc" separately and see
what happens?

Regards,
Navdeep

on both interfaces, this is what the interfaces looked like

cxl0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC>
metric 0 mtu 1500
options=ec07ab<RXCSUM,TXCSUM,VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
     ether 00:07:43:33:8a:20
     nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
     media: Ethernet 10Gbase-Twinax <full-duplex>
     status: active
vcxl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
     ether 00:07:43:33:8a:22
     nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
     media: Ethernet 10Gbase-Twinax <full-duplex>
     status: active
cxl1: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC>
metric 0 mtu 1500
options=ec07ab<RXCSUM,TXCSUM,VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
     ether 00:07:43:33:8a:28
     nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
     media: Ethernet 10Gbase-Twinax <full-duplex>
     status: active
vcxl1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
     ether 00:07:43:33:8a:2a
     nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
     media: Ethernet 10Gbase-Twinax <full-duplex>
     status: active

The interesting thing is, a tcpdump on cxl0 showed all the traffic I
expected to see, while tcpdump on cxl1 showed only broadcast traffic. After
playing with the switch config to make sure the difference was not on the
switch I pulled both patch cables out and into another server with the same
card. On the second server I could use tcpdump and see all the traffic I
expected on either interface.

Then back on the original server, I reloaded the device driver and tried
again. Now I got only broadcast on cxl0 and cxl1. Then finally I got all the
traffic to show up by doing

ifconfig cxl1 -promisc
ifconfig cxl1 promisc

It would appearer to me that the card can get into a state where ifconfig
reports that it is in promiscuous mode when it is not.


Joe Jones

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