[dpdk-dev] [PATCH] doc: remove iomem and ioport handling in igb_uio

[Ferruh Yigit]

On 9/22/2016 6:44 AM, Jianfeng Tan wrote:
> In igb_uio, iomem is mapped, and both ioport and io mem are recorded
> into uio framework (then into sysfs files), which is duplicated with
> what Linux has already provided for user space, and makes the code
> too complex.
> 
> For iomem, DPDK user space code never opens or reads files under
> /sys/pci/bus/devices/xxxx:xx:xx.x/uio/uioY/maps/. Instead,
> /sys/pci/bus/devices/xxxx:xx:xx.x/resourceY are used to map device
> memory.
> 
> For ioport, non-x86 platforms cannot read from files under
> /sys/pci/bus/devices/xxxx:xx:xx.x/uio/uioY/portio/ directly, because
> non-x86 platforms need to map port region for access in user space,
> see non-x86 version pci_uio_ioport_map(). x86 platforms can use the
> the same way as uio_pci_generic.
> 
> This will remove iomem and ioport mapping in igb_uio kernel module,
> and adjusts the iomem implementation in both igb_uio and
> uio_pci_generic:
>   - for x86 platform, get ports info from /proc/ioports;
>   - for non-x86 platform, map and get ports info by pci_uio_ioport_map().
> 
> Note: this will affect those applications who are using files under
> /sys/pci/bus/devices/xxxx:xx:xx.x/uio/uioY/maps/ and
> /sys/pci/bus/devices/xxxx:xx:xx.x/uio/uioY/portio/.
> 
> Suggested-by: Yigit, Ferruh <ferruh.yigit at intel.com>
> Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
> ---

Acked-by: Ferruh Yigit <ferruh.yigit at intel.com>