Merge branch 'mv88e6xxx-Add-per-port-devlink-regions'

Andrew Lunn says:

====================
mv88e6xxx: Add per port devlink regions

This patchset extends devlink regions to support per port regions, and
them makes use of them to support the ports of the mv88e6xxx switches.

root@rap:~# devlink region show
mdio_bus/gpio-0:00/global1: size 64 snapshot []
mdio_bus/gpio-0:00/global2: size 64 snapshot []
mdio_bus/gpio-0:00/atu: size 49152 snapshot []
mdio_bus/gpio-0:00/0/port: size 64 snapshot []
mdio_bus/gpio-0:00/1/port: size 64 snapshot []
mdio_bus/gpio-0:00/2/port: size 64 snapshot []
mdio_bus/gpio-0:00/3/port: size 64 snapshot []
mdio_bus/gpio-0:00/4/port: size 64 snapshot []
mdio_bus/gpio-0:00/5/port: size 64 snapshot []
mdio_bus/gpio-0:00/6/port: size 64 snapshot []
mdio_bus/gpio-0:00/7/port: size 64 snapshot []
mdio_bus/gpio-0:00/8/port: size 64 snapshot []
mdio_bus/gpio-0:00/9/port: size 64 snapshot []
mdio_bus/gpio-0:00/10/port: size 64 snapshot []

root@rap:~# devlink region new mdio_bus/gpio-0:00/1/port snapshot 42
root@rap:~# devlink region dump mdio_bus/gpio-0:00/1/port snapshot 42
0000000000000000 4f 1e 3e 20 00 01 01 39 3f 05 00 00 fd 07 00 00
0000000000000010 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 91
0000000000000020 00 00 00 00 00 00 00 00 00 00 00 00 22 00 00 00
0000000000000030 07 3e 00 00 00 00 00 80 00 00 00 00 00 00 5b 00

In order to support all ports of the switch, a new devlink flavour has
been added for unused ports:

mdio_bus/gpio-0:00/0: type notset flavour unused splittable false
mdio_bus/gpio-0:00/1: type notset flavour cpu port 1 splittable false
mdio_bus/gpio-0:00/2: type eth netdev red flavour physical port 2 splittable fae
mdio_bus/gpio-0:00/3: type eth netdev blue flavour physical port 3 splittable fe
mdio_bus/gpio-0:00/4: type eth netdev green flavour physical port 4 splittable e
mdio_bus/gpio-0:00/5: type notset flavour unused splittable false
mdio_bus/gpio-0:00/6: type notset flavour unused splittable false
mdio_bus/gpio-0:00/7: type notset flavour unused splittable false
mdio_bus/gpio-0:00/8: type eth netdev waic0 flavour physical port 8 splittable e
mdio_bus/gpio-0:00/9: type notset flavour unused splittable false
mdio_bus/gpio-0:00/10: type notset flavour unused splittable false

The DSA core now creates the devlink port instances earlier, so that
the driver setup function can make use of them.

v3:
Whitespace cleanup
Added justification for devlink unused flavour
Added Tested-by, Reviewed-by:
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 227 insertions, 27 deletions

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 0f3c8b2ec056..65b8ac8b5fba 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -347,8 +347,12 @@ devlink_sb_tc_index_get_from_info(struct devlink_sb *devlink_sb,
 
 struct devlink_region {
 	struct devlink *devlink;
+	struct devlink_port *port;
 	struct list_head list;
-	const struct devlink_region_ops *ops;
+	union {
+		const struct devlink_region_ops *ops;
+		const struct devlink_port_region_ops *port_ops;
+	};
 	struct list_head snapshot_list;
 	u32 max_snapshots;
 	u32 cur_snapshots;
@@ -374,6 +378,19 @@ devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
 	return NULL;
 }
 
+static struct devlink_region *
+devlink_port_region_get_by_name(struct devlink_port *port,
+				const char *region_name)
+{
+	struct devlink_region *region;
+
+	list_for_each_entry(region, &port->region_list, list)
+		if (!strcmp(region->ops->name, region_name))
+			return region;
+
+	return NULL;
+}
+
 static struct devlink_snapshot *
 devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
 {
@@ -3926,6 +3943,11 @@ static int devlink_nl_region_fill(struct sk_buff *msg, struct devlink *devlink,
 	if (err)
 		goto nla_put_failure;
 
+	if (region->port)
+		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX,
+				region->port->index))
+			goto nla_put_failure;
+
 	err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, region->ops->name);
 	if (err)
 		goto nla_put_failure;
@@ -3973,6 +3995,11 @@ devlink_nl_region_notify_build(struct devlink_region *region,
 	if (err)
 		goto out_cancel_msg;
 
+	if (region->port)
+		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX,
+				region->port->index))
+			goto out_cancel_msg;
+
 	err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME,
 			     region->ops->name);
 	if (err)
@@ -4219,16 +4246,30 @@ static int devlink_nl_cmd_region_get_doit(struct sk_buff *skb,
 					  struct genl_info *info)
 {
 	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_port *port = NULL;
 	struct devlink_region *region;
 	const char *region_name;
 	struct sk_buff *msg;
+	unsigned int index;
 	int err;
 
 	if (!info->attrs[DEVLINK_ATTR_REGION_NAME])
 		return -EINVAL;
 
+	if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
+		index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
+
+		port = devlink_port_get_by_index(devlink, index);
+		if (!port)
+			return -ENODEV;
+	}
+
 	region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
-	region = devlink_region_get_by_name(devlink, region_name);
+	if (port)
+		region = devlink_port_region_get_by_name(port, region_name);
+	else
+		region = devlink_region_get_by_name(devlink, region_name);
+
 	if (!region)
 		return -EINVAL;
 
@@ -4247,10 +4288,75 @@ static int devlink_nl_cmd_region_get_doit(struct sk_buff *skb,
 	return genlmsg_reply(msg, info);
 }
 
+static int devlink_nl_cmd_region_get_port_dumpit(struct sk_buff *msg,
+						 struct netlink_callback *cb,
+						 struct devlink_port *port,
+						 int *idx,
+						 int start)
+{
+	struct devlink_region *region;
+	int err = 0;
+
+	list_for_each_entry(region, &port->region_list, list) {
+		if (*idx < start) {
+			(*idx)++;
+			continue;
+		}
+		err = devlink_nl_region_fill(msg, port->devlink,
+					     DEVLINK_CMD_REGION_GET,
+					     NETLINK_CB(cb->skb).portid,
+					     cb->nlh->nlmsg_seq,
+					     NLM_F_MULTI, region);
+		if (err)
+			goto out;
+		(*idx)++;
+	}
+
+out:
+	return err;
+}
+
+static int devlink_nl_cmd_region_get_devlink_dumpit(struct sk_buff *msg,
+						    struct netlink_callback *cb,
+						    struct devlink *devlink,
+						    int *idx,
+						    int start)
+{
+	struct devlink_region *region;
+	struct devlink_port *port;
+	int err = 0;
+
+	mutex_lock(&devlink->lock);
+	list_for_each_entry(region, &devlink->region_list, list) {
+		if (*idx < start) {
+			(*idx)++;
+			continue;
+		}
+		err = devlink_nl_region_fill(msg, devlink,
+					     DEVLINK_CMD_REGION_GET,
+					     NETLINK_CB(cb->skb).portid,
+					     cb->nlh->nlmsg_seq,
+					     NLM_F_MULTI, region);
+		if (err)
+			goto out;
+		(*idx)++;
+	}
+
+	list_for_each_entry(port, &devlink->port_list, list) {
+		err = devlink_nl_cmd_region_get_port_dumpit(msg, cb, port, idx,
+							    start);
+		if (err)
+			goto out;
+	}
+
+out:
+	mutex_unlock(&devlink->lock);
+	return err;
+}
+
 static int devlink_nl_cmd_region_get_dumpit(struct sk_buff *msg,
 					    struct netlink_callback *cb)
 {
-	struct devlink_region *region;
 	struct devlink *devlink;
 	int start = cb->args[0];
 	int idx = 0;
@@ -4260,25 +4366,10 @@ static int devlink_nl_cmd_region_get_dumpit(struct sk_buff *msg,
 	list_for_each_entry(devlink, &devlink_list, list) {
 		if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
 			continue;
-
-		mutex_lock(&devlink->lock);
-		list_for_each_entry(region, &devlink->region_list, list) {
-			if (idx < start) {
-				idx++;
-				continue;
-			}
-			err = devlink_nl_region_fill(msg, devlink,
-						     DEVLINK_CMD_REGION_GET,
-						     NETLINK_CB(cb->skb).portid,
-						     cb->nlh->nlmsg_seq,
-						     NLM_F_MULTI, region);
-			if (err) {
-				mutex_unlock(&devlink->lock);
-				goto out;
-			}
-			idx++;
-		}
-		mutex_unlock(&devlink->lock);
+		err = devlink_nl_cmd_region_get_devlink_dumpit(msg, cb, devlink,
+							       &idx, start);
+		if (err)
+			goto out;
 	}
 out:
 	mutex_unlock(&devlink_mutex);
@@ -4291,8 +4382,10 @@ static int devlink_nl_cmd_region_del(struct sk_buff *skb,
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_snapshot *snapshot;
+	struct devlink_port *port = NULL;
 	struct devlink_region *region;
 	const char *region_name;
+	unsigned int index;
 	u32 snapshot_id;
 
 	if (!info->attrs[DEVLINK_ATTR_REGION_NAME] ||
@@ -4302,7 +4395,19 @@ static int devlink_nl_cmd_region_del(struct sk_buff *skb,
 	region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
 	snapshot_id = nla_get_u32(info->attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]);
 
-	region = devlink_region_get_by_name(devlink, region_name);
+	if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
+		index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
+
+		port = devlink_port_get_by_index(devlink, index);
+		if (!port)
+			return -ENODEV;
+	}
+
+	if (port)
+		region = devlink_port_region_get_by_name(port, region_name);
+	else
+		region = devlink_region_get_by_name(devlink, region_name);
+
 	if (!region)
 		return -EINVAL;
 
@@ -4319,9 +4424,11 @@ devlink_nl_cmd_region_new(struct sk_buff *skb, struct genl_info *info)
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_snapshot *snapshot;
+	struct devlink_port *port = NULL;
 	struct nlattr *snapshot_id_attr;
 	struct devlink_region *region;
 	const char *region_name;
+	unsigned int index;
 	u32 snapshot_id;
 	u8 *data;
 	int err;
@@ -4332,7 +4439,20 @@ devlink_nl_cmd_region_new(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
-	region = devlink_region_get_by_name(devlink, region_name);
+
+	if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
+		index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
+
+		port = devlink_port_get_by_index(devlink, index);
+		if (!port)
+			return -ENODEV;
+	}
+
+	if (port)
+		region = devlink_port_region_get_by_name(port, region_name);
+	else
+		region = devlink_region_get_by_name(devlink, region_name);
+
 	if (!region) {
 		NL_SET_ERR_MSG_MOD(info->extack, "The requested region does not exist");
 		return -EINVAL;
@@ -4368,7 +4488,12 @@ devlink_nl_cmd_region_new(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
-	err = region->ops->snapshot(devlink, region->ops, info->extack, &data);
+	if (port)
+		err = region->port_ops->snapshot(port, region->port_ops,
+						 info->extack, &data);
+	else
+		err = region->ops->snapshot(devlink, region->ops,
+					    info->extack, &data);
 	if (err)
 		goto err_snapshot_capture;
 
@@ -4490,10 +4615,12 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 	u64 ret_offset, start_offset, end_offset = U64_MAX;
 	struct nlattr **attrs = info->attrs;
+	struct devlink_port *port = NULL;
 	struct devlink_region *region;
 	struct nlattr *chunks_attr;
 	const char *region_name;
 	struct devlink *devlink;
+	unsigned int index;
 	void *hdr;
 	int err;
 
@@ -4514,8 +4641,21 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 		goto out_unlock;
 	}
 
+	if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
+		index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
+
+		port = devlink_port_get_by_index(devlink, index);
+		if (!port)
+			return -ENODEV;
+	}
+
 	region_name = nla_data(attrs[DEVLINK_ATTR_REGION_NAME]);
-	region = devlink_region_get_by_name(devlink, region_name);
+
+	if (port)
+		region = devlink_port_region_get_by_name(port, region_name);
+	else
+		region = devlink_region_get_by_name(devlink, region_name);
+
 	if (!region) {
 		err = -EINVAL;
 		goto out_unlock;
@@ -4552,6 +4692,11 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	if (err)
 		goto nla_put_failure;
 
+	if (region->port)
+		if (nla_put_u32(skb, DEVLINK_ATTR_PORT_INDEX,
+				region->port->index))
+			goto nla_put_failure;
+
 	err = nla_put_string(skb, DEVLINK_ATTR_REGION_NAME, region_name);
 	if (err)
 		goto nla_put_failure;
@@ -7612,7 +7757,8 @@ static bool devlink_port_type_should_warn(struct devlink_port *devlink_port)
 {
 	/* Ignore CPU and DSA flavours. */
 	return devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_CPU &&
-	       devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_DSA;
+	       devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_DSA &&
+	       devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_UNUSED;
 }
 
 #define DEVLINK_PORT_TYPE_WARN_TIMEOUT (HZ * 3600)
@@ -7665,6 +7811,7 @@ int devlink_port_register(struct devlink *devlink,
 	mutex_init(&devlink_port->reporters_lock);
 	list_add_tail(&devlink_port->list, &devlink->port_list);
 	INIT_LIST_HEAD(&devlink_port->param_list);
+	INIT_LIST_HEAD(&devlink_port->region_list);
 	mutex_unlock(&devlink->lock);
 	INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
 	devlink_port_type_warn_schedule(devlink_port);
@@ -7688,6 +7835,7 @@ void devlink_port_unregister(struct devlink_port *devlink_port)
 	list_del(&devlink_port->list);
 	mutex_unlock(&devlink->lock);
 	WARN_ON(!list_empty(&devlink_port->reporter_list));
+	WARN_ON(!list_empty(&devlink_port->region_list));
 	mutex_destroy(&devlink_port->reporters_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_port_unregister);
@@ -7897,6 +8045,7 @@ static int __devlink_port_phys_port_name_get(struct devlink_port *devlink_port,
 		break;
 	case DEVLINK_PORT_FLAVOUR_CPU:
 	case DEVLINK_PORT_FLAVOUR_DSA:
+	case DEVLINK_PORT_FLAVOUR_UNUSED:
 		/* As CPU and DSA ports do not have a netdevice associated
 		 * case should not ever happen.
 		 */
@@ -8767,6 +8916,57 @@ unlock:
 EXPORT_SYMBOL_GPL(devlink_region_create);
 
 /**
+ *	devlink_port_region_create - create a new address region for a port
+ *
+ *	@port: devlink port
+ *	@ops: region operations and name
+ *	@region_max_snapshots: Maximum supported number of snapshots for region
+ *	@region_size: size of region
+ */
+struct devlink_region *
+devlink_port_region_create(struct devlink_port *port,
+			   const struct devlink_port_region_ops *ops,
+			   u32 region_max_snapshots, u64 region_size)
+{
+	struct devlink *devlink = port->devlink;
+	struct devlink_region *region;
+	int err = 0;
+
+	if (WARN_ON(!ops) || WARN_ON(!ops->destructor))
+		return ERR_PTR(-EINVAL);
+
+	mutex_lock(&devlink->lock);
+
+	if (devlink_port_region_get_by_name(port, ops->name)) {
+		err = -EEXIST;
+		goto unlock;
+	}
+
+	region = kzalloc(sizeof(*region), GFP_KERNEL);
+	if (!region) {
+		err = -ENOMEM;
+		goto unlock;
+	}
+
+	region->devlink = devlink;
+	region->port = port;
+	region->max_snapshots = region_max_snapshots;
+	region->port_ops = ops;
+	region->size = region_size;
+	INIT_LIST_HEAD(&region->snapshot_list);
+	list_add_tail(&region->list, &port->region_list);
+	devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_NEW);
+
+	mutex_unlock(&devlink->lock);
+	return region;
+
+unlock:
+	mutex_unlock(&devlink->lock);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(devlink_port_region_create);
+
+/**
  *	devlink_region_destroy - destroy address region
  *
  *	@region: devlink region to destroy