Re: [Qemu-devel] [PATCH v2 00/13] Introduce Intel 82574 GbE Controller Emulation (e1000e)

[Jason Wang <jasowang@redhat.com>]

On 03/03/2016 06:02 PM, Leonid Bloch wrote:
> Greetings Qemu-Devel,
>
> I am wondering if any of you have further comments on the series in issue.
>
> Links to individual patches are attached, for convenience.
>
> Kind regards,
> Leonid.

Hello Leonid:

I've begun the reviewing. But consider the series is rather large
(thousands of lines), it still need some time. I will try to give
feedbacks next week.

Thanks

>
> http://patchwork.ozlabs.org/patch/586418
> http://patchwork.ozlabs.org/patch/586422
> http://patchwork.ozlabs.org/patch/586427
> http://patchwork.ozlabs.org/patch/586421
> http://patchwork.ozlabs.org/patch/586420
> http://patchwork.ozlabs.org/patch/586430
> http://patchwork.ozlabs.org/patch/586426
> http://patchwork.ozlabs.org/patch/586431
> http://patchwork.ozlabs.org/patch/586423
> http://patchwork.ozlabs.org/patch/586419
> http://patchwork.ozlabs.org/patch/586429
> http://patchwork.ozlabs.org/patch/586424
> http://patchwork.ozlabs.org/patch/586432
>
> On Mon, Feb 22, 2016 at 7:37 PM, Leonid Bloch
> <leonid.bloch@ravellosystems.com> wrote:
>> Hello All,
>>
>> This is v2 of the patches, after the initial reviews.
>>
>> For convenience, the same patches are available at:
>> https://github.com/daynix/qemu-e1000e/tree/e1000e-submit-v2
>>
>> Best regards,
>> Leonid.
>>
>> Changes since v1:
>>
>> 1. PCI_PM_CAP_VER_1_1 is defined now in include/hw/pci/pci_regs.h and
>>    not in include/standard-headers/linux/pci_regs.h.
>> 2. Changes in naming and extra comments in hw/pci/pcie.c and in
>>    include/hw/pci/pcie.h.
>> 3. Defining pci_dsn_ver and pci_dsn_cap static const variables in
>>    hw/pci/pcie.c, instead of PCI_DSN_VER and PCI_DSN_CAP symbolic
>>    constants in include/hw/pci/pcie_regs.h.
>> 4. Changing the vmxnet3_device_serial_num function in hw/net/vmxnet3.c
>>    to avoid the cast when it is called.
>> 5. Avoiding a preceding underscore in all the e1000e-related names.
>> 6. Minor style changes.
>>
>> ===================
>>
>> Hello All,
>>
>> This series is the final code of the e1000e device emulation, that we
>> have developed. Please review, and consider acceptance of these patches
>> to the upstream QEMU repository.
>>
>> The code stability was verified by various traffic tests using Fedora 22
>> Linux, and Windows Server 2012R2 guests. Also, Microsoft Hardware
>> Certification Kit (HCK) tests were run on a Windows Server 2012R2 guest.
>>
>> There was a discussion on the possibility of code sharing between the
>> e1000e, and the existing e1000 devices. We have reviewed the final code
>> for parts that may be shared between this device and the currently
>> available e1000 emulation. The device specifications are very different,
>> and there are almost no registers, nor functions, that were left as is
>> from e1000. The ring descriptor structures were changed as well, by the
>> introduction of extended and PS descriptors, as well as additional bits.
>>
>> Additional differences stem from the fact that the e1000e device re-uses
>> network packet abstractions introduced by the vmxnet3 device, while the
>> e1000 has its own code for packet handling. BTW, it may be worth reusing
>> those abstractions in e1000 as well. (Following these changes the
>> vmxnet3 device was successfully tested for possible regressions.)
>>
>> There are a few minor parts that may be shared, e.g. the default
>> register handlers, and the ring management functions. The total amount
>> of shared lines will be about 100--150, so we're not sure if it makes
>> sense bothering, and taking a risk of breaking e1000, which is a good,
>> old, and stable device.
>>
>> Currently, the e1000e code is stand alone w.r.t. e1000.
>>
>> Please share your thoughts.
>>
>> Thanks in advance,
>> Dmitry.
>>
>>
>> Changes since RFCv2:
>>
>> 1. Device functionality verified using Microsoft Hardware Certification Test Kit (HCK)
>> 2. Introduced a number of performance improvements
>> 3. The code was cleaned, and rebased to the latest master
>> 4. Patches verified with checkpatch.pl
>>
>> ===================
>>
>> Changes since RFCv1:
>>
>> 1. Added support for all the device features:
>>   - Interrupt moderation.
>>   - RSS.
>>   - Multiqueue.
>> 2. Simulated exact PCI/PCIe configuration space layout.
>> 3. Made fixes needed to pass Microsoft's HW certification tests (HCK).
>>
>> This series is still an RFC, because the following tasks are not done yet:
>>
>> 1. See which code can be shared between this device and the existing e1000 device.
>> 2. Rebase patches to the latest master (current base is v2.3.0).
>>
>> Please share your thoughts,
>> Thanks, Dmitry.
>>
>> ===================
>>
>> Hello qemu-devel,
>>
>> This patch series is an RFC for the new networking device emulation
>> we're developing for QEMU.
>>
>> This new device emulates the Intel 82574 GbE Controller and works
>> with unmodified Intel e1000e drivers from the Linux/Windows kernels.
>>
>> The status of the current series is "Functional Device Ready, work
>> on Extended Features in Progress".
>>
>> More precisely, these patches represent a functional device, which
>> is recognized by the standard Intel drivers, and is able to transfer
>> TX/RX packets with CSO/TSO offloads, according to the spec.
>>
>> Extended features not supported yet (work in progress):
>>   1. TX/RX Interrupt moderation mechanisms
>>   2. RSS
>>   3. Full-featured multi-queue (use of multiqueued network backend)
>>
>> Also, there will be some code refactoring and performance
>> optimization efforts.
>>
>> This series was tested on Linux (Fedora 22) and Windows (2012R2)
>> guests, using Iperf, with TX/RX and TCP/UDP streams, and various
>> packet sizes.
>>
>> More thorough testing, including data streams with different MTU
>> sizes, and Microsoft Certification (HLK) tests, are pending missing
>> features' development.
>>
>> See commit messages (esp. "net: Introduce e1000e device emulation")
>> for more information about the development approaches and the
>> architecture options chosen for this device.
>>
>> This series is based upon v2.3.0 tag of the upstream QEMU repository,
>> and it will be rebased to latest before the final submission.
>>
>> Please share your thoughts - any feedback is highly welcomed :)
>>
>> Best Regards,
>> Dmitry Fleytman.
>>
>> Dmitry Fleytman (13):
>>   msix: make msix_clr_pending() visible for clients
>>   pci: Introduce define for PM capability version 1.1
>>   pcie: Add support for PCIe CAP v1
>>   pcie: Introduce function for DSN capability creation
>>   vmxnet3: Use generic function for DSN capability definition
>>   net: Introduce Toeplitz hash calculator
>>   net: Add macros for MAC address tracing
>>   vmxnet3: Use common MAC address tracing macros
>>   net_pkt: Name vmxnet3 packet abstractions more generic
>>   rtl8139: Move more TCP definitions to common header
>>   net_pkt: Extend packet abstraction as required by e1000e functionality
>>   e1000_regs: Add definitions for Intel 82574-specific bits
>>   net: Introduce e1000e device emulation
>>
>>  MAINTAINERS                |   14 +
>>  default-configs/pci.mak    |    1 +
>>  docs/specs/e1000e-spec.txt |   17 +
>>  hw/net/Makefile.objs       |    5 +-
>>  hw/net/e1000_regs.h        |  351 ++++-
>>  hw/net/e1000e.c            |  718 +++++++++
>>  hw/net/e1000e_core.c       | 3673 ++++++++++++++++++++++++++++++++++++++++++++
>>  hw/net/e1000e_core.h       |  230 +++
>>  hw/net/net_rx_pkt.c        |  599 ++++++++
>>  hw/net/net_rx_pkt.h        |  365 +++++
>>  hw/net/net_tx_pkt.c        |  631 ++++++++
>>  hw/net/net_tx_pkt.h        |  191 +++
>>  hw/net/rtl8139.c           |    5 -
>>  hw/net/vmxnet3.c           |  108 +-
>>  hw/net/vmxnet_debug.h      |    3 -
>>  hw/net/vmxnet_rx_pkt.c     |  187 ---
>>  hw/net/vmxnet_rx_pkt.h     |  176 ---
>>  hw/net/vmxnet_tx_pkt.c     |  581 -------
>>  hw/net/vmxnet_tx_pkt.h     |  148 --
>>  hw/pci/msix.c              |    2 +-
>>  hw/pci/pcie.c              |   94 +-
>>  include/hw/pci/msix.h      |    1 +
>>  include/hw/pci/pci_regs.h  |    2 +
>>  include/hw/pci/pcie.h      |    5 +
>>  include/hw/pci/pcie_regs.h |    5 +-
>>  include/net/checksum.h     |   49 +-
>>  include/net/eth.h          |  161 +-
>>  include/net/net.h          |    5 +
>>  net/checksum.c             |    7 +-
>>  net/eth.c                  |  410 ++++-
>>  tests/Makefile             |    4 +-
>>  trace-events               |  210 +++
>>  32 files changed, 7681 insertions(+), 1277 deletions(-)
>>  create mode 100644 docs/specs/e1000e-spec.txt
>>  create mode 100644 hw/net/e1000e.c
>>  create mode 100644 hw/net/e1000e_core.c
>>  create mode 100644 hw/net/e1000e_core.h
>>  create mode 100644 hw/net/net_rx_pkt.c
>>  create mode 100644 hw/net/net_rx_pkt.h
>>  create mode 100644 hw/net/net_tx_pkt.c
>>  create mode 100644 hw/net/net_tx_pkt.h
>>  delete mode 100644 hw/net/vmxnet_rx_pkt.c
>>  delete mode 100644 hw/net/vmxnet_rx_pkt.h
>>  delete mode 100644 hw/net/vmxnet_tx_pkt.c
>>  delete mode 100644 hw/net/vmxnet_tx_pkt.h
>>
>> --
>> 2.5.0
>>