Re: [PATCH v3 01/15] dmaengine: idxd: add wq driver name support for accel-config user tool

[Fenghua Yu]

Hi, Tom,

On 4/28/23 13:55, Tom Zanussi wrote:
> From: Dave Jiang <dave.jiang@xxxxxxxxx>
>
> With the possibility of multiple wq drivers that can be bound to the wq,
> the user config tool accel-config needs a way to know which wq driver to
> bind to the wq. Introduce per wq driver_name sysfs attribute where the user
> can indicate the driver to be bound to the wq. This allows accel-config to
> just bind to the driver using wq->driver_name.
>
> Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> Signed-off-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
> ---

...

> diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
> index 7ced8d283d98..505118fc19de 100644
> --- a/drivers/dma/idxd/idxd.h
> +++ b/drivers/dma/idxd/idxd.h
> @@ -214,6 +214,8 @@ struct idxd_wq {
>   	char name[WQ_NAME_SIZE + 1];
>   	u64 max_xfer_bytes;
>   	u32 max_batch_size;
> +
> +	char driver_name[WQ_NAME_SIZE + 1];

It's confused to use "WQ_NAME_SIZE" for driver name size.
Maybe it's better to have a new definition "DRIVER_NAME_SIZE"?
BTW, WQ_NAME_SIZE is 1024 which is unnecessary big for storing 
driver_name[] in the structure. It would be better to have a smaller 
size (e.g. 128) in DRIVER_NAME_SIZE.

Thanks.

-Fenghua