[PATCH linux-next v3 3/6] vdpa: Enable user to set mac and mtu of vdpa device

[Parav Pandit <parav@nvidia.com>]

$ vdpa dev add name bar mgmtdev vdpasim_net

$ vdpa dev config set bar mac 00:11:22:33:44:55 mtu 9000

$ vdpa dev config show
bar: mac 00:11:22:33:44:55 link up link_announce false mtu 9000 speed 0 duplex 0

$ vdpa dev config show -jp
{
    "config": {
        "bar": {
            "mac": "00:11:22:33:44:55",
            "link ": "up",
            "link_announce ": false,
            "mtu": 9000,
            "speed": 0,
            "duplex": 0
        }
    }
}

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
---
changelog:
v2->v3:
 - using new setup_config callback to setup device params via mgmt tool
   to avoid mixing with existing set_config().
---
 drivers/vdpa/vdpa.c       | 91 ++++++++++++++++++++++++++++++++++++++-
 include/linux/vdpa.h      | 18 ++++++++
 include/uapi/linux/vdpa.h |  1 +
 3 files changed, 109 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 1295528244c3..40874bd92126 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -14,7 +14,6 @@
 #include <uapi/linux/vdpa.h>
 #include <net/genetlink.h>
 #include <linux/mod_devicetable.h>
-#include <linux/virtio_net.h>
 #include <linux/virtio_ids.h>
 
 static LIST_HEAD(mdev_head);
@@ -849,10 +848,94 @@ vdpa_nl_cmd_dev_config_get_dumpit(struct sk_buff *msg, struct netlink_callback *
 	return msg->len;
 }
 
+static int vdpa_dev_net_config_set(struct vdpa_device *vdev,
+				   struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **nl_attrs = info->attrs;
+	struct vdpa_dev_set_config config = {};
+	const u8 *macaddr;
+	int err;
+
+	if (!netlink_capable(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (!vdev->config->setup_config)
+		return -EOPNOTSUPP;
+
+	if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
+		macaddr = nla_data(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
+		memcpy(config.net.mac, macaddr, sizeof(config.net.mac));
+		config.net_mask.mac_valid = true;
+	}
+	if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]) {
+		config.net.mtu =
+			nla_get_u16(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]);
+		config.net_mask.mtu_valid = true;
+	}
+
+	mutex_lock(&vdev->cf_mutex);
+	err = vdev->config->setup_config(vdev, &config);
+	mutex_unlock(&vdev->cf_mutex);
+	return err;
+}
+
+static int vdpa_dev_config_set(struct vdpa_device *vdev, struct sk_buff *skb,
+			       struct genl_info *info)
+{
+	int err = -EOPNOTSUPP;
+	u32 device_id;
+
+	if (!vdev->mdev)
+		return -EOPNOTSUPP;
+
+	device_id = vdev->config->get_device_id(vdev);
+	switch (device_id) {
+	case VIRTIO_ID_NET:
+		err = vdpa_dev_net_config_set(vdev, skb, info);
+		break;
+	default:
+		break;
+	}
+	return err;
+}
+
+static int vdpa_nl_cmd_dev_config_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct vdpa_device *vdev;
+	const char *devname;
+	struct device *dev;
+	int err;
+
+	if (!info->attrs[VDPA_ATTR_DEV_NAME])
+		return -EINVAL;
+	devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
+
+	mutex_lock(&vdpa_dev_mutex);
+	dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
+	if (!dev) {
+		mutex_unlock(&vdpa_dev_mutex);
+		NL_SET_ERR_MSG_MOD(info->extack, "device not found");
+		return -ENODEV;
+	}
+	vdev = container_of(dev, struct vdpa_device, dev);
+	if (!vdev->mdev) {
+		mutex_unlock(&vdpa_dev_mutex);
+		put_device(dev);
+		return -EINVAL;
+	}
+	err = vdpa_dev_config_set(vdev, skb, info);
+	put_device(dev);
+	mutex_unlock(&vdpa_dev_mutex);
+	return err;
+}
+
 static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
 	[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING },
 	[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING },
 	[VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING },
+	[VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR,
+	/* virtio spec 1.1 section 5.1.4.1 for valid MTU range */
+	[VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68),
 };
 
 static const struct genl_ops vdpa_nl_ops[] = {
@@ -886,6 +969,12 @@ static const struct genl_ops vdpa_nl_ops[] = {
 		.doit = vdpa_nl_cmd_dev_config_get_doit,
 		.dumpit = vdpa_nl_cmd_dev_config_get_dumpit,
 	},
+	{
+		.cmd = VDPA_CMD_DEV_CONFIG_SET,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit = vdpa_nl_cmd_dev_config_set_doit,
+		.flags = GENL_ADMIN_PERM,
+	},
 };
 
 static struct genl_family vdpa_nl_family __ro_after_init = {
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index bf104f9f461a..9b7238d5310e 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -6,6 +6,8 @@
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/vhost_iotlb.h>
+#include <linux/virtio_net.h>
+#include <linux/if_ether.h>
 
 /**
  * struct vdpa_calllback - vDPA callback definition.
@@ -70,6 +72,17 @@ struct vdpa_iova_range {
 	u64 last;
 };
 
+struct vdpa_dev_set_config {
+	struct {
+		u8 mac[ETH_ALEN];
+		u16 mtu;
+	} net;
+	struct {
+		u8 mac_valid: 1;
+		u8 mtu_valid: 1;
+	} net_mask;
+};
+
 /**
  * struct vdpa_config_ops - operations for configuring a vDPA device.
  * Note: vDPA device drivers are required to implement all of the
@@ -169,6 +182,9 @@ struct vdpa_iova_range {
  *				@buf: buffer used to write from
  *				@len: the length to write to
  *				configuration space
+ * @setup_config:		Setup configuration space
+ *				@vdev: vdpa device
+ *				#config: configuration to apply to device
  * @get_generation:		Get device config generation (optional)
  *				@vdev: vdpa device
  *				Returns u32: device generation
@@ -241,6 +257,8 @@ struct vdpa_config_ops {
 			   void *buf, unsigned int len);
 	void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
 			   const void *buf, unsigned int len);
+	int (*setup_config)(struct vdpa_device *vdev,
+			    const struct vdpa_dev_set_config *config);
 	u32 (*get_generation)(struct vdpa_device *vdev);
 	struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
 
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 5c31ecc3b956..ec349789b8d1 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -18,6 +18,7 @@ enum vdpa_command {
 	VDPA_CMD_DEV_DEL,
 	VDPA_CMD_DEV_GET,		/* can dump */
 	VDPA_CMD_DEV_CONFIG_GET,	/* can dump */
+	VDPA_CMD_DEV_CONFIG_SET,
 };
 
 enum vdpa_attr {
-- 
2.26.2

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