netdev - Re: [PATCH v9 net-next 05/14] pds_core: set up device and adminq

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Message-ID: <20230409120320.GD182481@unreal>
Date:   Sun, 9 Apr 2023 15:03:20 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Shannon Nelson <shannon.nelson@....com>
Cc:     brett.creeley@....com, davem@...emloft.net, netdev@...r.kernel.org,
        kuba@...nel.org, drivers@...sando.io, jiri@...nulli.us
Subject: Re: [PATCH v9 net-next 05/14] pds_core: set up device and adminq

On Thu, Apr 06, 2023 at 04:41:34PM -0700, Shannon Nelson wrote:
> Set up the basic adminq and notifyq queue structures.  These are
> used mostly by the client drivers for feature configuration.
> These are essentially the same adminq and notifyq as in the
> ionic driver.
> 
> Part of this includes querying for device identity and FW
> information, so we can make that available to devlink dev info.
> 
>   $ devlink dev info pci/0000:b5:00.0
>   pci/0000:b5:00.0:
>     driver pds_core
>     serial_number FLM18420073
>     versions:
>         fixed:
>           asic.id 0x0
>           asic.rev 0x0
>         running:
>           fw 1.51.0-73
>         stored:
>           fw.goldfw 1.15.9-C-22
>           fw.mainfwa 1.60.0-73
>           fw.mainfwb 1.60.0-57
> 
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
>  .../device_drivers/ethernet/amd/pds_core.rst  |  47 ++
>  drivers/net/ethernet/amd/pds_core/core.c      | 450 ++++++++++++-
>  drivers/net/ethernet/amd/pds_core/core.h      | 154 +++++
>  drivers/net/ethernet/amd/pds_core/debugfs.c   |  76 +++
>  drivers/net/ethernet/amd/pds_core/devlink.c   |  61 ++
>  drivers/net/ethernet/amd/pds_core/main.c      |  17 +-
>  include/linux/pds/pds_adminq.h                | 637 ++++++++++++++++++
>  7 files changed, 1438 insertions(+), 4 deletions(-)
>  create mode 100644 include/linux/pds/pds_adminq.h

<...>

> +void pdsc_stop(struct pdsc *pdsc)
> +{
> +	if (pdsc->wq)
> +		flush_workqueue(pdsc->wq);
> +
> +	pdsc_mask_interrupts(pdsc);
> +}
> +

<...>

>  static const struct devlink_ops pdsc_dl_vf_ops = {
> @@ -332,6 +346,7 @@ static void pdsc_remove(struct pci_dev *pdev)
>  		mutex_lock(&pdsc->config_lock);
>  		set_bit(PDSC_S_STOPPING_DRIVER, &pdsc->state);
>  
> +		pdsc_stop(pdsc);

You are calling to flush this workqueue in a couple of line above.

>  		pdsc_teardown(pdsc, PDSC_TEARDOWN_REMOVING);
>  		mutex_unlock(&pdsc->config_lock);
>  		mutex_destroy(&pdsc->config_lock);
> diff --git a/include/linux/pds/pds_adminq.h b/include/linux/pds/pds_adminq.h
> new file mode 100644
> index 000000000000..9cd58b7f5fb2
> --- /dev/null
> +++ b/include/linux/pds/pds_adminq.h
> @@ -0,0 +1,637 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +

<...>

> +/* The color bit is a 'done' bit for the completion descriptors
> + * where the meaning alternates between '1' and '0' for alternating
> + * passes through the completion descriptor ring.
> + */
> +static inline u8 pdsc_color_match(u8 color, u8 done_color)

static inline bool?

> +{
> +	return (!!(color & PDS_COMP_COLOR_MASK)) == done_color;
> +}
> +#endif /* _PDS_CORE_ADMINQ_H_ */
> -- 
> 2.17.1
>