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Date: Sun, 9 Apr 2023 14:26:45 +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 01/14] pds_core: initial framework for
pds_core PF driver
On Thu, Apr 06, 2023 at 04:41:30PM -0700, Shannon Nelson wrote:
> This is the initial PCI driver framework for the new pds_core device
> driver and its family of devices. This does the very basics of
> registering for the new PF PCI device 1dd8:100c, setting up debugfs
> entries, and registering with devlink.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
> .../device_drivers/ethernet/amd/pds_core.rst | 40 ++
> .../device_drivers/ethernet/index.rst | 1 +
> drivers/net/ethernet/amd/pds_core/Makefile | 8 +
> drivers/net/ethernet/amd/pds_core/core.h | 63 ++
> drivers/net/ethernet/amd/pds_core/debugfs.c | 34 ++
> drivers/net/ethernet/amd/pds_core/main.c | 285 +++++++++
> include/linux/pds/pds_common.h | 14 +
> include/linux/pds/pds_core_if.h | 540 ++++++++++++++++++
> 8 files changed, 985 insertions(+)
> create mode 100644 Documentation/networking/device_drivers/ethernet/amd/pds_core.rst
> create mode 100644 drivers/net/ethernet/amd/pds_core/Makefile
> create mode 100644 drivers/net/ethernet/amd/pds_core/core.h
> create mode 100644 drivers/net/ethernet/amd/pds_core/debugfs.c
> create mode 100644 drivers/net/ethernet/amd/pds_core/main.c
> create mode 100644 include/linux/pds/pds_common.h
> create mode 100644 include/linux/pds/pds_core_if.h
<...>
> +#ifdef CONFIG_DEBUG_FS
> +void pdsc_debugfs_create(void);
> +void pdsc_debugfs_destroy(void);
> +void pdsc_debugfs_add_dev(struct pdsc *pdsc);
> +void pdsc_debugfs_del_dev(struct pdsc *pdsc);
> +#else
> +static inline void pdsc_debugfs_create(void) { }
> +static inline void pdsc_debugfs_destroy(void) { }
> +static inline void pdsc_debugfs_add_dev(struct pdsc *pdsc) { }
> +static inline void pdsc_debugfs_del_dev(struct pdsc *pdsc) { }
> +#endif
I don't think that you need CONFIG_DEBUG_FS guard as debugfs code is
built to handle this case, so you can call to internal debugfs_*() calls
without completed initialization of debugfs.
> +
> +#endif /* _PDSC_H_ */
> diff --git a/drivers/net/ethernet/amd/pds_core/debugfs.c b/drivers/net/ethernet/amd/pds_core/debugfs.c
> new file mode 100644
> index 000000000000..9b2385c19c41
> --- /dev/null
> +++ b/drivers/net/ethernet/amd/pds_core/debugfs.c
> @@ -0,0 +1,34 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +#include <linux/pci.h>
> +
> +#include "core.h"
> +
> +static struct dentry *pdsc_dir;
> +
> +void pdsc_debugfs_create(void)
> +{
> + pdsc_dir = debugfs_create_dir(PDS_CORE_DRV_NAME, NULL);
> +}
> +
> +void pdsc_debugfs_destroy(void)
> +{
> + debugfs_remove_recursive(pdsc_dir);
> +}
> +
> +void pdsc_debugfs_add_dev(struct pdsc *pdsc)
> +{
> + pdsc->dentry = debugfs_create_dir(pci_name(pdsc->pdev), pdsc_dir);
> +
> + debugfs_create_ulong("state", 0400, pdsc->dentry, &pdsc->state);
> +}
> +
> +void pdsc_debugfs_del_dev(struct pdsc *pdsc)
> +{
> + debugfs_remove_recursive(pdsc->dentry);
> + pdsc->dentry = NULL;
> +}
> +#endif /* CONFIG_DEBUG_FS */
> diff --git a/drivers/net/ethernet/amd/pds_core/main.c b/drivers/net/ethernet/amd/pds_core/main.c
> new file mode 100644
> index 000000000000..1c2f3fbaa27c
> --- /dev/null
> +++ b/drivers/net/ethernet/amd/pds_core/main.c
> @@ -0,0 +1,285 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/pci.h>
> +
> +#include <linux/pds/pds_common.h>
> +
> +#include "core.h"
> +
> +MODULE_DESCRIPTION(PDSC_DRV_DESCRIPTION);
> +MODULE_AUTHOR("Advanced Micro Devices, Inc");
> +MODULE_LICENSE("GPL");
> +
> +/* Supported devices */
> +static const struct pci_device_id pdsc_id_table[] = {
> + { PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_CORE_PF) },
> + { 0, } /* end of table */
> +};
> +MODULE_DEVICE_TABLE(pci, pdsc_id_table);
> +
> +static void pdsc_unmap_bars(struct pdsc *pdsc)
> +{
> + struct pdsc_dev_bar *bars = pdsc->bars;
> + unsigned int i;
> +
> + for (i = 0; i < PDS_CORE_BARS_MAX; i++) {
> + if (bars[i].vaddr) {
> + pci_iounmap(pdsc->pdev, bars[i].vaddr);
> + bars[i].vaddr = NULL;
> + }
> +
> + bars[i].len = 0;
> + bars[i].bus_addr = 0;
> + bars[i].res_index = 0;
Why are you clearing it? You are going to release bars[] anyway.
It will be great to remove this zeroing pattern from whole driver
as it hides use-after-free bugs.
> + }
> +}
> +
> +static int pdsc_map_bars(struct pdsc *pdsc)
> +{
> + struct pdsc_dev_bar *bar = pdsc->bars;
> + struct pci_dev *pdev = pdsc->pdev;
> + struct device *dev = pdsc->dev;
> + struct pdsc_dev_bar *bars;
> + unsigned int i, j;
> + int num_bars = 0;
> + int err;
> + u32 sig;
> +
> + bars = pdsc->bars;
> + num_bars = 0;
You set it to zero 4 lines above.
> +
<...>
> +module_init(pdsc_init_module);
> +module_exit(pdsc_cleanup_module);
> diff --git a/include/linux/pds/pds_common.h b/include/linux/pds/pds_common.h
> new file mode 100644
> index 000000000000..bd041a5170a6
> --- /dev/null
> +++ b/include/linux/pds/pds_common.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB) OR BSD-2-Clause */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
> +
> +#ifndef _PDS_COMMON_H_
> +#define _PDS_COMMON_H_
> +
> +#define PDS_CORE_DRV_NAME "pds_core"
It is KBUILD_MODNAME.
> +
> +/* the device's internal addressing uses up to 52 bits */
> +#define PDS_CORE_ADDR_LEN 52
> +#define PDS_CORE_ADDR_MASK (BIT_ULL(PDS_ADDR_LEN) - 1)
> +#define PDS_PAGE_SIZE 4096
Thanks
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