Re: [PATCH v1 1/6] staging: qlge: Initialize devlink health dump framework for the dlge driver

Dan Carpenter
2020-10-08T13:34:44Z

On Thu, Oct 08, 2020 at 07:58:03PM +0800, Coiby Xu wrote:
> Initialize devlink health dump framework for the dlge driver so the
> coredump could be done via devlink.
>
> Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
> ---
> drivers/staging/qlge/Kconfig | 1 +
> drivers/staging/qlge/Makefile | 2 +-
> drivers/staging/qlge/qlge.h | 9 +++++++
> drivers/staging/qlge/qlge_devlink.c | 38 +++++++++++++++++++++++++++++
> drivers/staging/qlge/qlge_devlink.h | 8 ++++++
> drivers/staging/qlge/qlge_main.c | 28 +++++++++++++++++++++
> 6 files changed, 85 insertions(+), 1 deletion(-)
> create mode 100644 drivers/staging/qlge/qlge_devlink.c
> create mode 100644 drivers/staging/qlge/qlge_devlink.h
>
> diff --git a/drivers/staging/qlge/Kconfig b/drivers/staging/qlge/Kconfig
> index a3cb25a3ab80..6d831ed67965 100644
> --- a/drivers/staging/qlge/Kconfig
> +++ b/drivers/staging/qlge/Kconfig
> @@ -3,6 +3,7 @@
> config QLGE
> tristate "QLogic QLGE 10Gb Ethernet Driver Support"
> depends on ETHERNET && PCI
> + select NET_DEVLINK
> help
> This driver supports QLogic ISP8XXX 10Gb Ethernet cards.
>
> diff --git a/drivers/staging/qlge/Makefile b/drivers/staging/qlge/Makefile
> index 1dc2568e820c..07c1898a512e 100644
> --- a/drivers/staging/qlge/Makefile
> +++ b/drivers/staging/qlge/Makefile
> @@ -5,4 +5,4 @@
>
> obj-$(CONFIG_QLGE) += qlge.o
>
> -qlge-objs := qlge_main.o qlge_dbg.o qlge_mpi.o qlge_ethtool.o
> +qlge-objs := qlge_main.o qlge_dbg.o qlge_mpi.o qlge_ethtool.o qlge_devlink.o
> diff --git a/drivers/staging/qlge/qlge.h b/drivers/staging/qlge/qlge.h
> index b295990e361b..290e754450c5 100644
> --- a/drivers/staging/qlge/qlge.h
> +++ b/drivers/staging/qlge/qlge.h
> @@ -2060,6 +2060,14 @@ struct nic_operations {
> int (*port_initialize)(struct ql_adapter *qdev);
> };
>
> +
> +

Having multiple blank lines in a row leads to a static checker warning.
Please run `checkpatch.pl --strict` over your patches.

> +struct qlge_devlink {
> + struct ql_adapter *qdev;
> + struct net_device *ndev;
> + struct devlink_health_reporter *reporter;
> +};
> +
> /*
> * The main Adapter structure definition.
> * This structure has all fields relevant to the hardware.
> @@ -2077,6 +2085,7 @@ struct ql_adapter {
> struct pci_dev *pdev;
> struct net_device *ndev; /* Parent NET device */
>
> + struct qlge_devlink *ql_devlink;
> /* Hardware information */
> u32 chip_rev_id;
> u32 fw_rev_id;
> diff --git a/drivers/staging/qlge/qlge_devlink.c b/drivers/staging/qlge/qlge_devlink.c
> new file mode 100644
> index 000000000000..aa45e7e368c0
> --- /dev/null
> +++ b/drivers/staging/qlge/qlge_devlink.c
> @@ -0,0 +1,38 @@
> +#include "qlge.h"
> +#include "qlge_devlink.h"
> +
> +static int
> +qlge_reporter_coredump(struct devlink_health_reporter *reporter,
> + struct devlink_fmsg *fmsg, void *priv_ctx,
> + struct netlink_ext_ack *extack)
> +{
> + return 0;
> +}
> +
> +static const struct devlink_health_reporter_ops qlge_reporter_ops = {
> + .name = "dummy",
> + .dump = qlge_reporter_coredump,

Indented too far.

> +};
> +
> +int qlge_health_create_reporters(struct qlge_devlink *priv)
> +{
> + int err;
> +

No blanks in the middle of declarations.

> + struct devlink_health_reporter *reporter;
> + struct devlink *devlink;

Generally this driver declares variables in "Reverse Christmas Tree"
order. The names are orderred by the length of the line from longest
to shortest.

type long_name;
type medium;
type short;

> +
> + devlink = priv_to_devlink(priv);
> + reporter =
> + devlink_health_reporter_create(devlink, &qlge_reporter_ops,
> + 0,
> + priv);

Break this up like so:

reporter = devlink_health_reporter_create(devlink, &qlge_reporter_ops,
0, priv);

> + if (IS_ERR(reporter)) {
> + netdev_warn(priv->ndev,
> + "Failed to create reporter, err = %ld\n",
> + PTR_ERR(reporter));
> + return PTR_ERR(reporter);

No point in returning an error if the caller doesn't check?

> + }
> + priv->reporter = reporter;
> +
> + return err;

err is uninitialized. "return 0;"

> +}
> diff --git a/drivers/staging/qlge/qlge_devlink.h b/drivers/staging/qlge/qlge_devlink.h
> new file mode 100644
> index 000000000000..c91f7a29e805
> --- /dev/null
> +++ b/drivers/staging/qlge/qlge_devlink.h
> @@ -0,0 +1,8 @@
> +#ifndef QLGE_DEVLINK_H
> +#define QLGE_DEVLINK_H
> +
> +#include <net/devlink.h>
> +
> +int qlge_health_create_reporters(struct qlge_devlink *priv);
> +
> +#endif /* QLGE_DEVLINK_H */
> diff --git a/drivers/staging/qlge/qlge_main.c b/drivers/staging/qlge/qlge_main.c
> index 27da386f9d87..135225530e51 100644
> --- a/drivers/staging/qlge/qlge_main.c
> +++ b/drivers/staging/qlge/qlge_main.c
> @@ -42,6 +42,7 @@
> #include <net/ip6_checksum.h>
>
> #include "qlge.h"
> +#include "qlge_devlink.h"
>
> char qlge_driver_name[] = DRV_NAME;
> const char qlge_driver_version[] = DRV_VERSION;
> @@ -4549,6 +4550,8 @@ static void ql_timer(struct timer_list *t)
> mod_timer(&qdev->timer, jiffies + (5 * HZ));
> }
>
> +static const struct devlink_ops qlge_devlink_ops;
> +
> static int qlge_probe(struct pci_dev *pdev,
> const struct pci_device_id *pci_entry)
> {
> @@ -4556,6 +4559,13 @@ static int qlge_probe(struct pci_dev *pdev,
> struct ql_adapter *qdev = NULL;
> static int cards_found;
> int err = 0;
> + struct devlink *devlink;
> + struct qlge_devlink *ql_devlink;
> +
> + devlink = devlink_alloc(&qlge_devlink_ops, sizeof(struct qlge_devlink));
> + if (!devlink)
> + return -ENOMEM;
> + ql_devlink = devlink_priv(devlink);
>
> ndev = alloc_etherdev_mq(sizeof(struct ql_adapter),
> min(MAX_CPUS,
> @@ -4614,6 +4624,16 @@ static int qlge_probe(struct pci_dev *pdev,
> free_netdev(ndev);
> return err;
> }
> +
> + err = devlink_register(devlink, &pdev->dev);
> + if (err) {
> + goto devlink_free;
> + }

Checkpatch warning.

regards,
dan carpenter