netdevsim: Implement port types and indexing

Define type of ports, which netdevsim driver currently operates with as
PF. Define new port type - VF, which will be implemented in following
patches. Add helper functions to distinguish them. Add helper function
to get VF index from port index.

Add port indexing logic where PFs' indexes starts from 0, VFs' - from
NSIM_DEV_VF_PORT_INDEX_BASE.
All ports uses same index pool, which means that PF port may be created
with index from VFs' indexes range.
Maximum number of VFs, which the driver can allocate, is limited by
UINT_MAX - BASE.

Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/bus.c

@@ -141,6 +141,12 @@ ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
 		goto unlock;
 	}
 
+	/* max_vfs limited by the maximum number of provided port indexes */
+	if (val > NSIM_DEV_VF_PORT_INDEX_MAX - NSIM_DEV_VF_PORT_INDEX_BASE) {
+		ret = -ERANGE;
+		goto unlock;
+	}
+
 	vfconfigs = kcalloc(val, sizeof(struct nsim_vf_config), GFP_KERNEL | __GFP_NOWARN);
 	if (!vfconfigs) {
 		ret = -ENOMEM;
@@ -178,7 +184,7 @@ new_port_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
 	devlink_reload_disable(devlink);
-	ret = nsim_dev_port_add(nsim_bus_dev, port_index);
+	ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
 	devlink_reload_enable(devlink);
 	mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
 	return ret ? ret : count;
@@ -207,7 +213,7 @@ del_port_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
 	devlink_reload_disable(devlink);
-	ret = nsim_dev_port_del(nsim_bus_dev, port_index);
+	ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
 	devlink_reload_enable(devlink);
 	mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
 	return ret ? ret : count;

drivers/net/netdevsim/dev.c

@@ -35,6 +35,25 @@
 
 #include "netdevsim.h"
 
+static unsigned int
+nsim_dev_port_index(enum nsim_dev_port_type type, unsigned int port_index)
+{
+	switch (type) {
+	case NSIM_DEV_PORT_TYPE_VF:
+		port_index = NSIM_DEV_VF_PORT_INDEX_BASE + port_index;
+		break;
+	case NSIM_DEV_PORT_TYPE_PF:
+		break;
+	}
+
+	return port_index;
+}
+
+static inline unsigned int nsim_dev_port_index_to_vf_index(unsigned int port_index)
+{
+	return port_index - NSIM_DEV_VF_PORT_INDEX_BASE;
+}
+
 static struct dentry *nsim_dev_ddir;
 
 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
@@ -923,7 +942,7 @@ static const struct devlink_ops nsim_dev_devlink_ops = {
 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 #define NSIM_DEV_TEST1_DEFAULT true
 
-static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
+static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
 			       unsigned int port_index)
 {
 	struct devlink_port_attrs attrs = {};
@@ -934,7 +953,8 @@ static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 	nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 	if (!nsim_dev_port)
 		return -ENOMEM;
-	nsim_dev_port->port_index = port_index;
+	nsim_dev_port->port_index = nsim_dev_port_index(type, port_index);
+	nsim_dev_port->port_type = type;
 
 	devlink_port = &nsim_dev_port->devlink_port;
 	attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
@@ -943,7 +963,7 @@ static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 	attrs.switch_id.id_len = nsim_dev->switch_id.id_len;
 	devlink_port_attrs_set(devlink_port, &attrs);
 	err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
-				    port_index);
+				    nsim_dev_port->port_index);
 	if (err)
 		goto err_port_free;
 
@@ -1000,7 +1020,7 @@ static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
 	int i, err;
 
 	for (i = 0; i < port_count; i++) {
-		err = __nsim_dev_port_add(nsim_dev, i);
+		err = __nsim_dev_port_add(nsim_dev, NSIM_DEV_PORT_TYPE_PF, i);
 		if (err)
 			goto err_port_del_all;
 	}
@@ -1216,32 +1236,34 @@ void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
 }
 
 static struct nsim_dev_port *
-__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
+__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
+		       unsigned int port_index)
 {
 	struct nsim_dev_port *nsim_dev_port;
 
+	port_index = nsim_dev_port_index(type, port_index);
 	list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
 		if (nsim_dev_port->port_index == port_index)
 			return nsim_dev_port;
 	return NULL;
 }
 
-int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
+int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
 		      unsigned int port_index)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	int err;
 
 	mutex_lock(&nsim_dev->port_list_lock);
-	if (__nsim_dev_port_lookup(nsim_dev, port_index))
+	if (__nsim_dev_port_lookup(nsim_dev, type, port_index))
 		err = -EEXIST;
 	else
-		err = __nsim_dev_port_add(nsim_dev, port_index);
+		err = __nsim_dev_port_add(nsim_dev, type, port_index);
 	mutex_unlock(&nsim_dev->port_list_lock);
 	return err;
 }
 
-int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
+int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
 		      unsigned int port_index)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
@@ -1249,7 +1271,7 @@ int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
 	int err = 0;
 
 	mutex_lock(&nsim_dev->port_list_lock);
-	nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
+	nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, type, port_index);
 	if (!nsim_dev_port)
 		err = -ENOENT;
 	else

drivers/net/netdevsim/netdevsim.h

@@ -197,10 +197,19 @@ static inline void nsim_dev_psample_exit(struct nsim_dev *nsim_dev)
 }
 #endif
 
+enum nsim_dev_port_type {
+	NSIM_DEV_PORT_TYPE_PF,
+	NSIM_DEV_PORT_TYPE_VF,
+};
+
+#define NSIM_DEV_VF_PORT_INDEX_BASE 128
+#define NSIM_DEV_VF_PORT_INDEX_MAX UINT_MAX
+
 struct nsim_dev_port {
 	struct list_head list;
 	struct devlink_port devlink_port;
 	unsigned int port_index;
+	enum nsim_dev_port_type port_type;
 	struct dentry *ddir;
 	struct netdevsim *ns;
 };
@@ -260,8 +269,10 @@ void nsim_dev_exit(void);
 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev);
 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev);
 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
+		      enum nsim_dev_port_type type,
 		      unsigned int port_index);
 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
+		      enum nsim_dev_port_type type,
 		      unsigned int port_index);
 
 struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
@@ -278,6 +289,15 @@ ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
 				   size_t count, loff_t *ppos);
 void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev);
 
+static inline bool nsim_dev_port_is_pf(struct nsim_dev_port *nsim_dev_port)
+{
+	return nsim_dev_port->port_type == NSIM_DEV_PORT_TYPE_PF;
+}
+
+static inline bool nsim_dev_port_is_vf(struct nsim_dev_port *nsim_dev_port)
+{
+	return nsim_dev_port->port_type == NSIM_DEV_PORT_TYPE_VF;
+}
 #if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
 void nsim_ipsec_init(struct netdevsim *ns);
 void nsim_ipsec_teardown(struct netdevsim *ns);