From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Tetsuya Mukawa <mukawa@igel.co.jp>
Cc: dev@dpdk.org, "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v2 0/7] virtio 1.0 enabling for virtio pmd driver
Date: Thu, 14 Jan 2016 13:59:49 +0800 [thread overview]
Message-ID: <20160114055949.GJ19531@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <569723B9.5080904@igel.co.jp>
On Thu, Jan 14, 2016 at 01:27:37PM +0900, Tetsuya Mukawa wrote:
> On 2016/01/12 15:58, Yuanhan Liu wrote:
> > v2: - fix a data corruption reported by Qian, due to hdr size mismatch.
> > check detailes at ptach 5.
> >
> > - Add missing config_irq and isr reading support from v1.
> >
> > - fix comments from v1.
> >
> > Almost all difference comes from virtio 1.0 are the PCI layout change:
> > the major configuration structures are stored at bar space, and their
> > location is stored at corresponding pci cap structure. Reading/parsing
> > them is one of the major work of patch 7.
> >
> > To make handling virtio v1.0 and v0.95 co-exist well, this patch set
> > introduces a virtio_pci_ops structure, to add another layer so that
> > we could keep those vtpci_foo_bar "APIs". With that, we could do the
> > minimum change to add virtio 1.0 support.
> >
> >
>
> Hi Yuanhan and Jianfeng,
>
> Thanks for great patches.
> I want to use VIRTIO-1.0 feature for my virtio container patch, because
> it will solve 44 bit memory address limitation.
> (So far, legacy virtio-net device only receives queue address under (1
> << (32 + 12)).)
>
> I have a few comments to rebase virtio container patches on this patches.
>
> 1. VIRTIO_READ_REG_X
>
> So far, VIRTIO_READ_REG_1/2/4 are defined in virtio_pci.h.
> But these macros are only referred by virtio_pci.c.
> How about moving the macros to virtio_pci.c?
Jianfeng had same suggestion. I could do that in next version then.
> 2. Abstraction of read/write accesses.
>
> It may be difficult to cleanly rebase my patches on this patches,
> because virtio_read_caps() is not abstracted.
I don't think we can/need abstract virtio_read_caps() here. As that
detects wheter it is a legacy or modern (virtio 1.0) virtio device
or not.
If virtio_read_caps failes, which could either due to pci map failed,
or because malformed pci layout, we fallback to legacy virtio 1.0
handling, using io port read/write to do configuration.
> Let me describe it more.
> So far, we need to handle below 3 virtio-net devices..
> - physical virtio-net device.
> - virtual virtio-net device in virtio-net PMD. (Jianfeng's patch)
> - virtual virtio-net device in QEMU. (my patch)
>
> Almost all code of the virtio-net PMD can be shared between above
> different cases.
> Probably big difference is how to access to configuration space.
>
> Yuanhan's patch introduces an abstraction layer to hide configuration
> space layout and how to access it.
Actually, I didn't introduce the abstraction for pci device access. It's
just a simple "if ... else ..." case here: use io port read/write, the
VIRTIO_READ/WRITE_REG_X macros, to do access for legacy virtio,
otherwise for modern virtio, use direct mapped memory read/write access:
modern_read/writex.
> Is it possible to separate?
As stated, there is no mix, therefore no need for seperation. But
you could add another access abstraction layer, and assign it properly
later, say, by checking eth_dev->dev_type as you suggested below.
> I guess "access method" will be nice to be abstracted separately from
> "configuration space layout".
> Probably access method will be defined by "eth_dev->dev_type" and the
> PMD name like "eth_cvio".
> And "configuration space layout" will be defined by capability list of
> PCI configuration layout.
>
> For example, if access method like below are abstracted separately and
> current "virtio_pci.c" is implemented on this abstraction, we can easily
> re-use virtio_read_caps().
> - how to read/write virtio configuration space.
It's abstracted by virtio_pci_ops.
> - how to mmap PCI configuration space.
> - how to read/(write) PCI configuration space.
For now, it's actually done by EAL, or by functions provided by EAL.
I haven't read your (as well Jianfeng's) code yet, but seems that
you need implement another set of functions for above needes for
your virtio device.
If so, I'd suggest you (or Jianfeng) to do the abstraction based on
my patchset: what I am kind of sure is that I should not add those
abstraction here, simply for it has nothing to do with virtio 1.0
enabling.
--yliu
next prev parent reply other threads:[~2016-01-14 5:58 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-10 3:54 [dpdk-dev] [PATCH 0/6 for 2.3] initial virtio 1.0 enabling Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 1/6] virtio: don't set vring address again at queue startup Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 2/6] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2015-12-29 11:31 ` Tan, Jianfeng
2015-12-30 3:45 ` Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 3/6] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 4/6] viritio: switch to 64 bit features Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 5/6] virtio: set RTE_PCI_DRV_NEED_MAPPING flag Yuanhan Liu
2015-12-10 3:54 ` [dpdk-dev] [PATCH 6/6] virtio: add virtio v1.0 support Yuanhan Liu
2015-12-29 11:39 ` Tan, Jianfeng
2015-12-30 3:40 ` Yuanhan Liu
2015-12-10 3:58 ` [dpdk-dev] [PATCH 0/6 for 2.3] initial virtio 1.0 enabling Yuanhan Liu
2015-12-29 11:19 ` Tan, Jianfeng
2015-12-30 3:53 ` Yuanhan Liu
2016-01-04 3:55 ` Xu, Qian Q
2016-01-04 4:16 ` Yuanhan Liu
2016-01-12 6:58 ` [dpdk-dev] [PATCH v2 0/7] virtio 1.0 enabling for virtio pmd driver Yuanhan Liu
2016-01-12 6:58 ` [dpdk-dev] [PATCH v2 1/7] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-01-12 6:58 ` [dpdk-dev] [PATCH v2 2/7] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-01-12 6:59 ` [dpdk-dev] [PATCH v2 3/7] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-01-12 6:59 ` [dpdk-dev] [PATCH v2 4/7] viritio: switch to 64 bit features Yuanhan Liu
2016-01-12 6:59 ` [dpdk-dev] [PATCH v2 5/7] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-01-12 6:59 ` [dpdk-dev] [PATCH v2 6/7] eal: pci: export pci_map_device Yuanhan Liu
2016-01-12 8:31 ` David Marchand
2016-01-12 8:40 ` Yuanhan Liu
2016-01-12 9:05 ` Yuanhan Liu
2016-01-13 14:44 ` Santosh Shukla
2016-01-12 6:59 ` [dpdk-dev] [PATCH v2 7/7] virtio: add 1.0 support Yuanhan Liu
2016-01-13 3:31 ` Tetsuya Mukawa
2016-01-13 9:38 ` Yuanhan Liu
2016-01-14 7:47 ` Xie, Huawei
2016-01-14 7:50 ` Yuanhan Liu
2016-01-14 7:51 ` Xie, Huawei
2016-01-14 7:58 ` Yuanhan Liu
2016-01-14 8:08 ` Xie, Huawei
2016-01-14 8:22 ` Yuanhan Liu
2016-01-14 8:28 ` Xie, Huawei
2016-01-14 7:50 ` Xie, Huawei
2016-01-14 8:38 ` Yuanhan Liu
2016-01-12 7:07 ` [dpdk-dev] [PATCH v2 0/7] virtio 1.0 enabling for virtio pmd driver Yuanhan Liu
2016-01-14 4:27 ` Tetsuya Mukawa
2016-01-14 5:59 ` Yuanhan Liu [this message]
2016-01-14 6:09 ` Tan, Jianfeng
2016-01-14 6:41 ` Tetsuya Mukawa
2016-01-18 9:04 ` Tetsuya Mukawa
2016-01-14 6:45 ` Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 0/8] " Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 1/8] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 2/8] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 3/8] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 4/8] viritio: switch to 64 bit features Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 5/8] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 6/8] eal: pci: export pci_[un]map_device Yuanhan Liu
2016-01-14 7:45 ` Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 7/8] virtio: add 1.0 support Yuanhan Liu
2016-01-14 7:42 ` [dpdk-dev] [PATCH v3 8/8] virtio: move VIRTIO_READ/WRITE_REG_X into virtio_pci.c Yuanhan Liu
2016-01-16 10:08 ` Santosh Shukla
2016-01-17 14:07 ` Santosh Shukla
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 0/8] virtio 1.0 enabling for virtio pmd driver Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 1/8] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 2/8] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-01-18 17:21 ` Xie, Huawei
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 3/8] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 4/8] viritio: switch to 64 bit features Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 5/8] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 6/8] eal: pci: export pci_[un]map_device Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 7/8] virtio: add 1.0 support Yuanhan Liu
2016-01-18 16:38 ` Xie, Huawei
2016-01-18 16:50 ` Xie, Huawei
2016-01-19 5:55 ` Yuanhan Liu
2016-01-19 7:44 ` Xie, Huawei
2016-01-19 7:54 ` Yuanhan Liu
2016-01-19 8:02 ` Xie, Huawei
2016-01-18 17:07 ` Xie, Huawei
2016-01-19 1:36 ` Yuanhan Liu
2016-01-19 1:51 ` Xie, Huawei
2016-01-19 2:46 ` Yuanhan Liu
2016-01-19 2:48 ` Xie, Huawei
2016-01-19 5:54 ` Yuanhan Liu
2016-01-15 4:36 ` [dpdk-dev] [PATCH v4 8/8] virtio: move VIRTIO_READ/WRITE_REG_X into virtio_pci.c Yuanhan Liu
2016-01-15 8:57 ` Xu, Qian Q
2016-01-18 8:04 ` [dpdk-dev] [PATCH v4 0/8] virtio 1.0 enabling for virtio pmd driver Tetsuya Mukawa
2016-01-19 8:11 ` [dpdk-dev] [PATCH v5 0/9] " Yuanhan Liu
2016-01-19 8:11 ` [dpdk-dev] [PATCH v5 1/9] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-01-19 8:11 ` [dpdk-dev] [PATCH v5 2/9] virtio: define offset as size_t type Yuanhan Liu
2016-01-19 8:11 ` [dpdk-dev] [PATCH v5 3/9] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 4/9] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 5/9] viritio: switch to 64 bit features Yuanhan Liu
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 6/9] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 7/9] eal: pci: export pci_[un]map_device Yuanhan Liu
2016-01-19 8:17 ` David Marchand
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 8/9] virtio: add 1.0 support Yuanhan Liu
2016-01-21 11:37 ` Thomas Monjalon
2016-01-27 3:49 ` Yuanhan Liu
2016-01-21 11:49 ` Thomas Monjalon
2016-01-27 3:46 ` Yuanhan Liu
2016-01-27 8:11 ` Thomas Monjalon
2016-01-19 8:12 ` [dpdk-dev] [PATCH v5 9/9] virtio: move VIRTIO_READ/WRITE_REG_X into virtio_pci.c Yuanhan Liu
2016-01-19 8:55 ` [dpdk-dev] [PATCH v5 0/9] virtio 1.0 enabling for virtio pmd driver Xie, Huawei
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 " Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 1/9] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 2/9] virtio: define offset as size_t type Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 3/9] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 4/9] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 5/9] viritio: switch to 64 bit features Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 6/9] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 7/9] eal: pci: export pci_[un]map_device Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 8/9] virtio: add 1.0 support Yuanhan Liu
2016-01-28 7:54 ` [dpdk-dev] [PATCH v6 9/9] virtio: move VIRTIO_READ/WRITE_REG_X into virtio_pci.c Yuanhan Liu
2016-02-02 10:46 ` [dpdk-dev] [PATCH v6 0/9] virtio 1.0 enabling for virtio pmd driver Thomas Monjalon
2016-02-02 13:00 ` Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 " Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 1/9] virtio: don't set vring address again at queue startup Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 2/9] virtio: define offset as size_t type Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 3/9] virtio: introduce struct virtio_pci_ops Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 4/9] virtio: move left pci stuff to virtio_pci.c Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 5/9] viritio: switch to 64 bit features Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 6/9] virtio: retrieve hdr_size from hw->vtnet_hdr_size Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 7/9] eal: pci: export pci_[un]map_device Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 8/9] virtio: add 1.0 support Yuanhan Liu
2016-02-02 13:48 ` [dpdk-dev] [PATCH v7 9/9] virtio: move VIRTIO_READ/WRITE_REG_X into virtio_pci.c Yuanhan Liu
2016-02-03 15:09 ` [dpdk-dev] [PATCH v7 0/9] virtio 1.0 enabling for virtio pmd driver Thomas Monjalon
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