Re: [PATCH 0/5] hw/net/igb: emulated network device with SR-IOV

[Akihiko Odaki]

On 2022/12/23 12:23, Jason Wang wrote:
> On Thu, Dec 22, 2022 at 7:43 PM Sriram Yagnaraman
> <sriram.yagnaraman@est.tech> wrote:
> > A new attempt at adding support for Intel 82576 Gigabit Ethernet adapter
> > with SR-IOV support.
> >
> > Start qemu with the following parameters.
> >     qemu-system-x86_64 -enable-kvm -M q35 \
> >     ...
> >     -device pcie-root-port,slot=3,id=pcie_port.3 \
> >     -netdev 
> > tap,id=net3,script=no,downscript=/tmp/rmtap,ifname=xcbr3_t2,queues=1 \
> >     -device igb,bus=pcie_port.3,netdev=net3,mac=00:00:00:01:03:02
> >
> > Load IGB/IGBVF modules if needed.
> > modprobe igb
> > modprobe igbvf
> >
> > Create VFs via /sys
> > ls /sys/bus/pci/devices/0000:01:00.0/
> > echo 2 > /sys/bus/pci/devices/0000:01:00.0/sriov_numvfs
> >
> > Sriram Yagnaraman (5):
> >    pcie: add helper function to get number of VFs
> >    hw/net/net_tx_pkt: helper function to get l2 hdr
> >    hw/net/igb: register definitions
> >    hw/net/igb: emulated intel IGB (82576EB) network device
> >    hw/net/igb: build support for igb/igbvf devices
>
> Haven't reviewed this series but I think we'd have two more things:
>
> 1) update the MAINTAINERS
> 2) a qtest for igb (having a qtest for sr-iov would be even better)
>
> Thanks
>
> >   hw/i386/Kconfig             |    1 +
> >   hw/net/Kconfig              |    5 +
> >   hw/net/e1000_regs.h         |  357 +++-
> >   hw/net/e1000x_common.c      |   13 +
> >   hw/net/e1000x_common.h      |   28 +
> >   hw/net/igb.c                |  627 ++++++
> >   hw/net/igb.h                |  184 ++
> >   hw/net/igb_core.c           | 3782 +++++++++++++++++++++++++++++++++++
> >   hw/net/igb_core.h           |  216 ++
> >   hw/net/igbvf.c              |  262 +++
> >   hw/net/meson.build          |    2 +
> >   hw/net/net_tx_pkt.c         |   17 +-
> >   hw/net/net_tx_pkt.h         |    8 +
> >   hw/net/trace-events         |  190 ++
> >   hw/pci/pcie_sriov.c         |    6 +
> >   include/hw/pci/pcie_sriov.h |    5 +
> >   16 files changed, 5671 insertions(+), 32 deletions(-)
> >   create mode 100644 hw/net/igb.c
> >   create mode 100644 hw/net/igb.h
> >   create mode 100644 hw/net/igb_core.c
> >   create mode 100644 hw/net/igb_core.h
> >   create mode 100644 hw/net/igbvf.c
> >
> > --
> > 2.34.1

Hi Sriram and Jason,

Coincidentally we has also been working on igb emulation. Our tree is 
available at:
https://github.com/daynix/qemu/tree/akihikodaki/igb_sriov_rebase

Briefly looking at Sriram's series, it seems to have better feature 
coverage, but there are some changes present only in our tree as well. 
For instance, our tree includes a qtest though it does not test SR-IOV 
functionality.

I'd like to suggest you to review and merge Sriram's series first, and I 
can rebase our tree to extract changes present only in our tree, 
including qtest. Or it can be the other way around; I think I can finish 
my series in weeks so I may submit it once it is ready, and you can 
apply changes in Sriram's series on top it. I'd like to hear which is 
more convenient for you, or another idea if you have.

Regards,
Akihiko Odaki