Merge branch 'netdevsim-fix-tests-and-netdevsim'

Jakub Kicinski says:

====================
netdevsim: fix tests and netdevsim

The first patch fixes a merge which brought back some dead
code. Next a tiny re-write of the main test using netdevsim
aims to ease debugging.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/dev.c

@@ -753,7 +753,7 @@ static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 	return err;
 }
 
-static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
+int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev;
 	struct devlink *devlink;
@@ -761,7 +761,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 
 	devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
 	if (!devlink)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	devlink_net_set(devlink, nsim_bus_dev->initial_net);
 	nsim_dev = devlink_priv(devlink);
 	nsim_dev->nsim_bus_dev = nsim_bus_dev;
@@ -773,6 +773,8 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
 	nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
 
+	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
+
 	err = nsim_dev_resources_register(devlink);
 	if (err)
 		goto err_devlink_free;
@@ -818,7 +820,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 		goto err_bpf_dev_exit;
 
 	devlink_params_publish(devlink);
-	return nsim_dev;
+	return 0;
 
 err_bpf_dev_exit:
 	nsim_bpf_dev_exit(nsim_dev);
@@ -841,7 +843,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	devlink_resources_unregister(devlink, NULL);
 err_devlink_free:
 	devlink_free(devlink);
-	return ERR_PTR(err);
+	return err;
 }
 
 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
@@ -858,8 +860,9 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
 	nsim_fib_destroy(devlink, nsim_dev->fib_data);
 }
 
-static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
+void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
 {
+	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 
 	nsim_dev_reload_destroy(nsim_dev);
@@ -873,40 +876,6 @@ static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
 	devlink_free(devlink);
 }
 
-int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
-{
-	struct nsim_dev *nsim_dev;
-	int i;
-	int err;
-
-	nsim_dev = nsim_dev_create(nsim_bus_dev);
-	if (IS_ERR(nsim_dev))
-		return PTR_ERR(nsim_dev);
-	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
-
-	mutex_lock(&nsim_dev->port_list_lock);
-	for (i = 0; i < nsim_bus_dev->port_count; i++) {
-		err = __nsim_dev_port_add(nsim_dev, i);
-		if (err)
-			goto err_port_del_all;
-	}
-	mutex_unlock(&nsim_dev->port_list_lock);
-	return 0;
-
-err_port_del_all:
-	mutex_unlock(&nsim_dev->port_list_lock);
-	nsim_dev_port_del_all(nsim_dev);
-	nsim_dev_destroy(nsim_dev);
-	return err;
-}
-
-void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
-{
-	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
-
-	nsim_dev_destroy(nsim_dev);
-}
-
 static struct nsim_dev_port *
 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
 {

tools/testing/selftests/bpf/test_offload.py

@@ -335,13 +335,22 @@ class NetdevSimDev:
     """
     Class for netdevsim bus device and its attributes.
     """
+    @staticmethod
+    def ctrl_write(path, val):
+        fullpath = os.path.join("/sys/bus/netdevsim/", path)
+        try:
+            with open(fullpath, "w") as f:
+                f.write(val)
+        except OSError as e:
+            log("WRITE %s: %r" % (fullpath, val), -e.errno)
+            raise e
+        log("WRITE %s: %r" % (fullpath, val), 0)
 
     def __init__(self, port_count=1):
         addr = 0
         while True:
             try:
-                with open("/sys/bus/netdevsim/new_device", "w") as f:
-                    f.write("%u %u" % (addr, port_count))
+                self.ctrl_write("new_device", "%u %u" % (addr, port_count))
             except OSError as e:
                 if e.errno == errno.ENOSPC:
                     addr += 1
@@ -403,14 +412,13 @@ class NetdevSimDev:
         return progs
 
     def remove(self):
-        with open("/sys/bus/netdevsim/del_device", "w") as f:
-            f.write("%u" % self.addr)
+        self.ctrl_write("del_device", "%u" % (self.addr, ))
         devs.remove(self)
 
     def remove_nsim(self, nsim):
         self.nsims.remove(nsim)
-        with open("/sys/bus/netdevsim/devices/netdevsim%u/del_port" % self.addr ,"w") as f:
-            f.write("%u" % nsim.port_index)
+        self.ctrl_write("devices/netdevsim%u/del_port" % (self.addr, ),
+                        "%u" % (nsim.port_index, ))
 
 class NetdevSim:
     """