[Bug 241774] FreeBSD 11.3 & 12.0 has broken SCSI & Networking on KVM/QEMU Q35 with OVMF

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241774

--- Comment #19 from John Hartley <drum at graphica.com.au> ---
Tommy P & Matt S,

wound forward PCI code to 11.3 and network still working ok:

% find . -name '*.bak*' -print
./sbin/ipfw.bak
./sys/modules/mlx5en.bak
./sys/modules/netmap/Makefile.bak
./sys/modules/cxgbe.bak
./sys/modules/cxgbe.bak/if_cxgbe/Makefile.bak
./sys/modules/ipfw_nat64.bak
./sys/modules/mlx5.bak
./sys/modules/urtwn.bak
./sys/amd64/pci.bak.11.2
./sys/amd64/vmm.bak.11.2
./sys/dev/virtio/network.bak
./sys/dev/vmware/vmxnet3.bak
./sys/dev/cxgbe/firmware.bak.11.3
./sys/dev/usb/wlan.bak
./sys/dev/netmap.bak
./sys/dev/e1000.bak
./sys/dev/ixgbe.bak
./sys/dev/re.bak
./sys/dev/iwi.bak
./sys/dev/malo.bak
./sys/dev/mwl.bak
./sys/dev/ral.bak
./sys/dev/ixl.bak
./sys/dev/bwi.bak
./sys/dev/cxgbe.bak
./sys/dev/mlx5.bak
./sys/dev/oce.bak
./sys/dev/rtwn.bak
./sys/dev/urtwn.bak
./sys/dev/pci.bak.11.2
./sys/dev/pci.bak.11.2/pcireg.h.bak.11.2
./sys/conf/files.bak
./sys/net.bak
./sys/netinet.bak
./sys/net80211.bak
./sys/netinet6.bak
./sys/netpfil.bak

All (non VirtIO network ok):

% ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
        inet 127.0.0.1 netmask 0xff000000
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        groups: lo
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC>
        ether 52:54:00:4e:50:91
        hwaddr 52:54:00:4e:50:91
        inet 192.168.73.131 netmask 0xffffff00 broadcast 192.168.73.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
vmx0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=60039b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 52:54:00:0a:cc:0d
        hwaddr 52:54:00:0a:cc:0d
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
re0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=8009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LINKSTATE>
        ether 52:54:00:b2:20:53
        hwaddr 52:54:00:b2:20:53
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX
<full-duplex,flowcontrol,rxpause,txpause>)


So this confirm that source of issue is in the /dev/netmap code.

I will try to wind this forward on a commit by commit basis to see where it
breaks.

Cheers,


John Hartley.

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