netdev - Re: [PATCH net-next 06/19] net/mlx5: Add support for mediated devices in switchdev mode

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Date:   Fri, 8 Nov 2019 11:32:49 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Parav Pandit <parav@...lanox.com>
Cc:     alex.williamson@...hat.com, davem@...emloft.net,
        kvm@...r.kernel.org, netdev@...r.kernel.org, saeedm@...lanox.com,
        kwankhede@...dia.com, leon@...nel.org, cohuck@...hat.com,
        jiri@...lanox.com, linux-rdma@...r.kernel.org,
        Vu Pham <vuhuong@...lanox.com>
Subject: Re: [PATCH net-next 06/19] net/mlx5: Add support for mediated
 devices in switchdev mode

Thu, Nov 07, 2019 at 05:08:21PM CET, parav@...lanox.com wrote:
>From: Vu Pham <vuhuong@...lanox.com>

[...]

	
>+static ssize_t
>+max_mdevs_show(struct kobject *kobj, struct device *dev, char *buf)
>+{
>+	struct pci_dev *pdev = to_pci_dev(dev);
>+	struct mlx5_core_dev *coredev;
>+	struct mlx5_mdev_table *table;
>+	u16 max_sfs;
>+
>+	coredev = pci_get_drvdata(pdev);
>+	table = coredev->priv.eswitch->mdev_table;
>+	max_sfs = mlx5_core_max_sfs(coredev, &table->sf_table);
>+
>+	return sprintf(buf, "%d\n", max_sfs);
>+}
>+static MDEV_TYPE_ATTR_RO(max_mdevs);
>+
>+static ssize_t
>+available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
>+{
>+	struct pci_dev *pdev = to_pci_dev(dev);
>+	struct mlx5_core_dev *coredev;
>+	struct mlx5_mdev_table *table;
>+	u16 free_sfs;
>+
>+	coredev = pci_get_drvdata(pdev);
>+	table = coredev->priv.eswitch->mdev_table;
>+	free_sfs = mlx5_get_free_sfs(coredev, &table->sf_table);
>+	return sprintf(buf, "%d\n", free_sfs);
>+}
>+static MDEV_TYPE_ATTR_RO(available_instances);

These 2 arbitrary sysfs files are showing resource size/usage for
the whole eswitch/asic. That is a job for "devlink resource". Please
implement that.


>+
>+static struct attribute *mdev_dev_attrs[] = {
>+	&mdev_type_attr_max_mdevs.attr,
>+	&mdev_type_attr_available_instances.attr,
>+	NULL,
>+};
>+
>+static struct attribute_group mdev_mgmt_group = {
>+	.name  = "local",
>+	.attrs = mdev_dev_attrs,
>+};
>+
>+static struct attribute_group *mlx5_meddev_groups[] = {
>+	&mdev_mgmt_group,
>+	NULL,
>+};

[...]