[dpdk-dev] [PATCH v5 0/3] support both PIO and MMIO BAR for virtio PMD

[谢华伟(此时此刻）]

On 2020/10/27 16:50, chris wrote:
> @Ferruh: this patch is tested with both PIO and MMIO bar using testpmd 
> and start tx_first.
>
> vfio/igb_uio tested with MMIO bar (uio_pci_generic doesn't work with 
> msix, so it isn't tested)
>
> uio_pci_generic tested with PIO bar (igb_uio has unknown symbols, not 
> tested).
     igb_uio with PIO bar is also tested.
>
> Weird igb_uio doens't have Makefile.
>
>
> On 2020/10/22 23:51, 谢华伟(此时此刻） wrote:
>> From: "huawei.xhw" <huawei.xhw at alibaba-inc.com>
>>
>> Legacy virtio-pci only supports PIO BAR resource. As we need to 
>> create lots of
>> virtio devices and PIO resource on x86 is very limited, we expose 
>> MMIO BAR.
>>
>> Kernel supports both PIO  and MMIO BAR for legacy virtio-pci device. 
>> We handles
>> different type of BAR in the similar way.
>>
>> In previous implementation, with igb_uio we get PIO address from igb_uio
>> sysfs entry; with uio_pci_generic, we get PIO address from
>> /proc/ioports.
>> For PIO/MMIO RW, there is different path for different drivers and arch.
>> For VFIO, PIO/MMIO RW is through syscall, which has big performance
>> issue.
>> On X86, it assumes only PIO is supported.
>>
>> All of the above is too much twisted.
>> This patch unifies the way to get both PIO and MMIO address for 
>> different driver
>> and arch, all from standard resource attr under pci sysfs.
>>
>> We distinguish PIO and MMIO by their address like how kernel does. It 
>> is ugly but works.
>>
>> v2 changes:
>>      - add more explanation in the commit message
>>
>> v3 changes:
>>      - fix patch format issues
>>
>> v4 changes:
>>      - fixes for RTE_KDRV_UIO_GENERIC -> RTE_PCI_KDRV_UIO_GENERIC
>>
>> v5 changes:
>>      - split into three seperate patches
>>
>> huawei.xhw (3):
>>    PCI: use PCI standard sysfs entry to get PIO address
>>    PCI: support MMIO in rte_pci_ioport_map/unap/read/write
>>    PCI: don't use vfio ioctl call to access PIO resource
>>
>>   drivers/bus/pci/linux/pci.c     |  89 +-------------------
>>   drivers/bus/pci/linux/pci_uio.c | 177 
>> ++++++++++++++++++++++++++++------------
>>   2 files changed, 128 insertions(+), 138 deletions(-)
>>