linux-kernel - Re: [PATCH 01/20] dlb2: add skeleton for DLB 2.0 driver

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Date:   Sun, 12 Jul 2020 17:56:31 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Gage Eads <gage.eads@...el.com>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de,
        magnus.karlsson@...el.com, bjorn.topel@...el.com
Subject: Re: [PATCH 01/20] dlb2: add skeleton for DLB 2.0 driver

On Sun, Jul 12, 2020 at 08:43:12AM -0500, Gage Eads wrote:
> +config INTEL_DLB2
> +       tristate "Intel(R) Dynamic Load Balancer 2.0 Driver"
> +       depends on 64BIT && PCI && X86

Why just that platform?  What about CONFIG_TEST for everything else?

> +       help
> +         This driver supports the Intel(R) Dynamic Load Balancer 2.0 (DLB 2.0)
> +         device.

Are you sure you need the (R) in Kconfig texts everywhere?

And a bit more info here would be nice, as no one knows if they have
this or not, right?

> --- /dev/null
> +++ b/drivers/misc/dlb2/dlb2_hw_types.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)

Why dual licensed?  I thought that Intel told me they were not going to
do that anymore for any kernel code going forward as it was just such a
pain and never actually helped anything.  Has that changed?


> + * Copyright(c) 2016-2020 Intel Corporation
> + */
> +
> +#ifndef __DLB2_HW_TYPES_H
> +#define __DLB2_HW_TYPES_H
> +
> +#define DLB2_MAX_NUM_VDEVS 16
> +#define DLB2_MAX_NUM_DOMAINS 32
> +#define DLB2_MAX_NUM_LDB_QUEUES 32 /* LDB == load-balanced */
> +#define DLB2_MAX_NUM_DIR_QUEUES 64 /* DIR == directed */
> +#define DLB2_MAX_NUM_LDB_PORTS 64
> +#define DLB2_MAX_NUM_DIR_PORTS DLB2_MAX_NUM_DIR_QUEUES
> +#define DLB2_MAX_NUM_LDB_CREDITS 8192
> +#define DLB2_MAX_NUM_DIR_CREDITS 2048
> +#define DLB2_MAX_NUM_HIST_LIST_ENTRIES 2048
> +#define DLB2_MAX_NUM_AQED_ENTRIES 2048
> +#define DLB2_MAX_NUM_QIDS_PER_LDB_CQ 8
> +#define DLB2_MAX_NUM_SEQUENCE_NUMBER_GROUPS 2
> +#define DLB2_MAX_NUM_SEQUENCE_NUMBER_MODES 5
> +#define DLB2_QID_PRIORITIES 8
> +#define DLB2_NUM_ARB_WEIGHTS 8
> +#define DLB2_MAX_WEIGHT 255
> +#define DLB2_NUM_COS_DOMAINS 4
> +#define DLB2_MAX_CQ_COMP_CHECK_LOOPS 409600
> +#define DLB2_MAX_QID_EMPTY_CHECK_LOOPS (32 * 64 * 1024 * (800 / 30))
> +#define DLB2_HZ 800000000

No tabs?  How easy is that to read?  :(

greg k-h