[dpdk-dev] [PATCH] devbind: don't display non-existent device categories

[Hunt, David]

Hi Anatoly,

On 13/11/2018 4:42 PM, Anatoly Burakov wrote:
> If there aren't any devices of a particular category on user's
> system, we still display them, which is bad for usability. Fix
> devbind to not print out a category unless there are devices in
> it.
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
> ---
>   usertools/dpdk-devbind.py | 27 ++++++++++++++++++++-------
>   1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
> index 7d564634c..9f190e227 100755
> --- a/usertools/dpdk-devbind.py
> +++ b/usertools/dpdk-devbind.py
> @@ -546,14 +546,27 @@ def show_device_status(devices_type, device_name):
>               else:
>                   kernel_drv.append(devices[d])
>   
> +    n_devs = len(dpdk_drv) + len(kernel_drv) + len(no_drv)
> +
> +    # don't bother displaying anything if there are no devices
> +    if n_devs == 0:
> +        msg = "No '%s' devices detected" % device_name
> +	print("")
> +	print(msg)
> +	print("".join('=' * len(msg)))
> +        return
> +
>       # print each category separately, so we can clearly see what's used by DPDK
> -    display_devices("%s devices using DPDK-compatible driver" % device_name,
> -                    dpdk_drv, "drv=%(Driver_str)s unused=%(Module_str)s")
> -    display_devices("%s devices using kernel driver" % device_name, kernel_drv,
> -                    "if=%(Interface)s drv=%(Driver_str)s "
> -                    "unused=%(Module_str)s %(Active)s")
> -    display_devices("Other %s devices" % device_name, no_drv,
> -                    "unused=%(Module_str)s")
> +    if len(dpdk_drv) != 0:
> +        display_devices("%s devices using DPDK-compatible driver" % device_name,
> +                        dpdk_drv, "drv=%(Driver_str)s unused=%(Module_str)s")
> +    if len(kernel_drv) != 0:
> +        display_devices("%s devices using kernel driver" % device_name, kernel_drv,
> +                        "if=%(Interface)s drv=%(Driver_str)s "
> +                        "unused=%(Module_str)s %(Active)s")
> +    if len(no_drv) != 0:
> +        display_devices("Other %s devices" % device_name, no_drv,
> +                        "unused=%(Module_str)s")
>   
>   def show_status():
>       '''Function called when the script is passed the "--status" option.


I REALLY like this patch. It makes the dpdk-devbind output MUCH more 
readable!

Reviewed-by: David Hunt <david.hunt at intel.com>