Hello,
We have a T520-SO and have made a new install of 11.0, to begin with the
box would panic every time we tried to switch the card into netmap mode.
So we recompiled the kernel with netmap removed, then compiled the
netmap kernel module from github, as this in our experience generally
leads to a more stable netmap.
we have
uname -a
FreeBSD goose2 11.0-RELEASE-p1 FreeBSD 11.0-RELEASE-p1 #0: Wed Mar 22
16:52:35 UTC 2017 joe@goose2:/usr/obj/usr/src/sys/GENERIC amd64
and the following in /boot/loader.conf
t4fw_cfg_load="YES"
t5fw_cfg_load="YES"
if_cxgbe_load="YES"
hw.cxgbe.fl_pktshift=0
hw.cxgbe.toecaps_allowed=0
hw.cxgbe.nnmtxq10g=8
hw.cxgbe.nnmrxq10g=8
hw.cxgbe.num_vis=2
Before I run our application I run
ifconfig cxl1 promisc -vlanhwtag up
Now our application can now start without panicking the kernel. Here is
where it gets interesting, our application is able to announce it's self
via ARP, I can see the ethernet switch learning which port it's on, and
other hosts adding it to their ARP tables. When I try an ICMP ping it
goes missing. After watching the TX packet graph for the connected port
on the switch while starting and stopping a flood ping to the
application, I'm sure the packets are getting sent to the card, however
I don't see them in the netmap ring. If I kill our application, then use
ifconfig to create and configure a vlan port I can confirm that the card
is working and has connectivity.
Here's what I think is happening. ARP requests are received because they
are sent to the broadcast address. Our application then announces it's
self. However traffic destined for the application is send to a MAC
address which is neither the broadcast or the MAC programed into the
hardware and is dropped. My understanding of promiscuous it that it
informs the card that we want these dropped packets. It looks to me
like, when the card is in netmap mode the promisc flag is being ignored.
I have also tried using freebsd-update to update to p8. As with the p0
kernel we get a panic when we switch the card into netmap mode.
We did previously have these cards working in netmap mode. We were using
a pre 11 snapshot of the svn head though .
Many Thanks
Joe Jones
Stream Technologies
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