Hello,
I'm on 4.0.6 with CentOS 7.3.
The hypervisor is an old blade BL685c G1 and the network adapters used to
provide network to vm are
07:04.0 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit
Ethernet (rev a3)
07:04.1 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit
Ethernet (re
managed by tg3 kernel module, as I see in messages:

Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: Tigon3
[partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address
00:1c:c4:46:ef:73
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: attached PHY is
5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0])
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: RXcsums[1]
LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0:
dma_rwctrl[76148000] dma_mask[40-bit]
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: Tigon3
[partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address
00:1c:c4:46:ef:74
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: attached PHY is
5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0])
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: RXcsums[1]
LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1:
dma_rwctrl[76148000] dma_mask[40-bit]

The 2 adapters are in bonding active-backup mode.
They are on vlan, so on hypervisor I have bond1.65 device and in vm the
virtual interface is untagged

[root@ovmsrv05 ~]# ifconfig bond1.65
bond1.65: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:1c:c4:46:ef:73  txqueuelen 1000  (Ethernet)
        RX packets 4368  bytes 257675 (251.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 238  bytes 28146 (27.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@ovmsrv05 ~]#


Currently Active Slave: enp7s4f0

After a few minutes I loose connectivity with the guest. In this case if I
go in guest console and ping the gateway, the connection is resumed. And I
can maintain it if I leave the ping running, otherwise after a little I
again loose connectivity.
I suspect it is not important but the guest is Oracle Linux 6.5 with
3.8.13-16.2.1.el6uek.x86_64 kernel. The adapter for the vnic is the
default; the qemu-kvm command line generated contains this:
-netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=30 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:01:51,bus=pci.0,addr=0x3

I seem to remember some years ago when I used the same blades with plain
qemu-kvm/libvirt I had to make up an ethtool setting for similar problems,
but I don't remember what it was... and possibly I used bnx2 kernel module
with the other embedded network interfaces, I'm not sure...
Currently, the  configuration for adapter on the blade  is

[root@ovmsrv05 ~]# ethtool -k enp7s4f0
Features for enp7s4f0:
rx-checksumming: on
tx-checksumming: on
    tx-checksum-ipv4: on
    tx-checksum-ip-generic: off [fixed]
    tx-checksum-ipv6: off [fixed]
    tx-checksum-fcoe-crc: off [fixed]
    tx-checksum-sctp: off [fixed]
scatter-gather: on
    tx-scatter-gather: on
    tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: off
    tx-tcp-segmentation: off [requested on]
    tx-tcp-ecn-segmentation: off [fixed]
    tx-tcp6-segmentation: off [fixed]
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on [fixed]
tx-vlan-offload: on [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
busy-poll: off [fixed]
tx-sctp-segmentation: off [fixed]
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
[root@ovmsrv05 ~]#


systool shows no particular parameters for tg3 kernel module available
[root@ovmsrv05 ~]# systool -v -m tg3
Module = "tg3"

  Attributes:
    coresize            = "170653"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "0"
    rhelversion         = "7.3"
    srcversion          = "D276F97F491ADECC61C8284"
    taint               = ""
    uevent              = <store method only>
    version             = "3.137"

  Sections:
...

Thanks,
Gianluca
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