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
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
On 24/03/17 16:44, Navdeep Parhar wrote:
On Fri, Mar 24, 2017 at 6:40 AM, Joe Jones <j...@stream-technologies.com> wrote:
Hello Navdeep,
...
We were using our own MACs, we can fix the problem by using the mac from the
vcxl interface. Should we not be able to capture all traffic on the
interface regardless of what destination MAC it has.
You should, but you'll need to put vcxl<n> in promiscous mode for
that. The command that you posted had cxl<n> in promiscuous mode. As
I said earlier they share the wire but operate as independent network
interfaces otherwise.
Regards,
Navdeep
_______________________________________________
freebsd-net@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-net
To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
