Date:   Thu, 18 Apr 2019 16:06:09 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, mlxsw@...lanox.com,
        jakub.kicinski@...ronome.com, dsahern@...il.com
Subject: [patch net-next 10/15] netdevsim: merge sdev into dev

From: Jiri Pirko <jiri@...lanox.com>

As previously introduce dev which is mapped 1:1 to a bus device covers
the purpose of the original shared device, merge the sdev code into dev.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
rfc->v1:
- rebased
---
 drivers/net/netdevsim/Makefile              |  2 +-
 drivers/net/netdevsim/bpf.c                 | 79 +++++++++------------
 drivers/net/netdevsim/dev.c                 | 47 ++++++++++++
 drivers/net/netdevsim/netdev.c              | 49 ++++---------
 drivers/net/netdevsim/netdevsim.h           | 54 ++++++--------
 tools/testing/selftests/bpf/test_offload.py |  8 +--
 6 files changed, 120 insertions(+), 119 deletions(-)

diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile
index ab7e2c42088f..09f1315d2f2a 100644
--- a/drivers/net/netdevsim/Makefile
+++ b/drivers/net/netdevsim/Makefile
@@ -3,7 +3,7 @@
 obj-$(CONFIG_NETDEVSIM) += netdevsim.o
 
 netdevsim-objs := \
-	netdev.o dev.o fib.o sdev.o bus.o
+	netdev.o dev.o fib.o bus.o
 
 ifeq ($(CONFIG_BPF_SYSCALL),y)
 netdevsim-objs += \
diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index a93aafe87db3..89980b223adc 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -27,7 +27,7 @@
 	bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
 
 struct nsim_bpf_bound_prog {
-	struct netdevsim_shared_dev *sdev;
+	struct nsim_dev *nsim_dev;
 	struct bpf_prog *prog;
 	struct dentry *ddir;
 	const char *state;
@@ -65,8 +65,8 @@ nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
 	struct nsim_bpf_bound_prog *state;
 
 	state = env->prog->aux->offload->dev_priv;
-	if (state->sdev->bpf_bind_verifier_delay && !insn_idx)
-		msleep(state->sdev->bpf_bind_verifier_delay);
+	if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx)
+		msleep(state->nsim_dev->bpf_bind_verifier_delay);
 
 	if (insn_idx == env->prog->len - 1)
 		pr_vlog(env, "Hello from netdevsim!\n");
@@ -213,7 +213,7 @@ nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
 	return 0;
 }
 
-static int nsim_bpf_create_prog(struct netdevsim_shared_dev *sdev,
+static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
 				struct bpf_prog *prog)
 {
 	struct nsim_bpf_bound_prog *state;
@@ -223,13 +223,13 @@ static int nsim_bpf_create_prog(struct netdevsim_shared_dev *sdev,
 	if (!state)
 		return -ENOMEM;
 
-	state->sdev = sdev;
+	state->nsim_dev = nsim_dev;
 	state->prog = prog;
 	state->state = "verify";
 
 	/* Program id is not populated yet when we create the state. */
-	sprintf(name, "%u", sdev->prog_id_gen++);
-	state->ddir = debugfs_create_dir(name, sdev->ddir_bpf_bound_progs);
+	sprintf(name, "%u", nsim_dev->prog_id_gen++);
+	state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs);
 	if (IS_ERR_OR_NULL(state->ddir)) {
 		kfree(state);
 		return -ENOMEM;
@@ -240,7 +240,7 @@ static int nsim_bpf_create_prog(struct netdevsim_shared_dev *sdev,
 			    &state->state, &nsim_bpf_string_fops);
 	debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
 
-	list_add_tail(&state->l, &sdev->bpf_bound_progs);
+	list_add_tail(&state->l, &nsim_dev->bpf_bound_progs);
 
 	prog->aux->offload->dev_priv = state;
 
@@ -249,13 +249,13 @@ static int nsim_bpf_create_prog(struct netdevsim_shared_dev *sdev,
 
 static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
 {
-	struct netdevsim_shared_dev *sdev =
+	struct nsim_dev *nsim_dev =
 			bpf_offload_dev_priv(prog->aux->offload->offdev);
 
-	if (!sdev->bpf_bind_accept)
+	if (!nsim_dev->bpf_bind_accept)
 		return -EOPNOTSUPP;
 
-	return nsim_bpf_create_prog(sdev, prog);
+	return nsim_bpf_create_prog(nsim_dev, prog);
 }
 
 static int nsim_bpf_translate(struct bpf_prog *prog)
@@ -514,7 +514,7 @@ nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
 	}
 
 	offmap->dev_ops = &nsim_bpf_map_ops;
-	list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);
+	list_add_tail(&nmap->l, &ns->nsim_dev->bpf_bound_maps);
 
 	return 0;
 
@@ -578,51 +578,46 @@ int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 	}
 }
 
-static int nsim_bpf_sdev_init(struct netdevsim_shared_dev *sdev)
+int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
 {
 	int err;
 
-	INIT_LIST_HEAD(&sdev->bpf_bound_progs);
-	INIT_LIST_HEAD(&sdev->bpf_bound_maps);
+	INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs);
+	INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps);
 
-	sdev->ddir_bpf_bound_progs =
-		debugfs_create_dir("bpf_bound_progs", sdev->ddir);
-	if (IS_ERR_OR_NULL(sdev->ddir_bpf_bound_progs))
+	nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs",
+							    nsim_dev->ddir);
+	if (IS_ERR_OR_NULL(nsim_dev->ddir_bpf_bound_progs))
 		return -ENOMEM;
 
-	sdev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, sdev);
-	err = PTR_ERR_OR_ZERO(sdev->bpf_dev);
+	nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev);
+	err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev);
 	if (err)
 		return err;
 
-	sdev->bpf_bind_accept = true;
-	debugfs_create_bool("bpf_bind_accept", 0600, sdev->ddir,
-			    &sdev->bpf_bind_accept);
-	debugfs_create_u32("bpf_bind_verifier_delay", 0600, sdev->ddir,
-			   &sdev->bpf_bind_verifier_delay);
+	nsim_dev->bpf_bind_accept = true;
+	debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir,
+			    &nsim_dev->bpf_bind_accept);
+	debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir,
+			   &nsim_dev->bpf_bind_verifier_delay);
 	return 0;
 }
 
-static void nsim_bpf_sdev_uninit(struct netdevsim_shared_dev *sdev)
+void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
 {
-	WARN_ON(!list_empty(&sdev->bpf_bound_progs));
-	WARN_ON(!list_empty(&sdev->bpf_bound_maps));
-	bpf_offload_dev_destroy(sdev->bpf_dev);
+	WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs));
+	WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps));
+	bpf_offload_dev_destroy(nsim_dev->bpf_dev);
 }
 
 int nsim_bpf_init(struct netdevsim *ns)
 {
 	int err;
 
-	if (ns->sdev->refcnt == 1) {
-		err = nsim_bpf_sdev_init(ns->sdev);
-		if (err)
-			return err;
-	}
-
-	err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
+	err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev,
+					      ns->netdev);
 	if (err)
-		goto err_bpf_sdev_uninit;
+		return err;
 
 	debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
 			   &ns->bpf_offloaded_id);
@@ -644,11 +639,6 @@ int nsim_bpf_init(struct netdevsim *ns)
 			    &ns->bpf_map_accept);
 
 	return 0;
-
-err_bpf_sdev_uninit:
-	if (ns->sdev->refcnt == 1)
-		nsim_bpf_sdev_uninit(ns->sdev);
-	return err;
 }
 
 void nsim_bpf_uninit(struct netdevsim *ns)
@@ -656,8 +646,5 @@ void nsim_bpf_uninit(struct netdevsim *ns)
 	WARN_ON(ns->xdp.prog);
 	WARN_ON(ns->xdp_hw.prog);
 	WARN_ON(ns->bpf_offloaded);
-	bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
-
-	if (ns->sdev->refcnt == 1)
-		nsim_bpf_sdev_uninit(ns->sdev);
+	bpf_offload_dev_netdev_unregister(ns->nsim_dev->bpf_dev, ns->netdev);
 }
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index d0bec47cf8e5..ced32c85dd73 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -15,12 +15,31 @@
  * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  */
 
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/rtnetlink.h>
 #include <net/devlink.h>
 
 #include "netdevsim.h"
 
+static struct dentry *nsim_dev_ddir;
+
+static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
+{
+	char dev_ddir_name[10];
+
+	sprintf(dev_ddir_name, "%u", nsim_dev->nsim_bus_dev->dev.id);
+	nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
+	if (IS_ERR_OR_NULL(nsim_dev->ddir))
+		return PTR_ERR_OR_ZERO(nsim_dev->ddir) ?: -EINVAL;
+	return 0;
+}
+
+static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
+{
+	debugfs_remove_recursive(nsim_dev->ddir);
+}
+
 static u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
 {
 	struct nsim_dev *nsim_dev = priv;
@@ -184,6 +203,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	if (!devlink)
 		return ERR_PTR(-ENOMEM);
 	nsim_dev = devlink_priv(devlink);
+	nsim_dev->nsim_bus_dev = nsim_bus_dev;
 
 	nsim_dev->fib_data = nsim_fib_create();
 	if (IS_ERR(nsim_dev->fib_data)) {
@@ -199,8 +219,20 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	if (err)
 		goto err_resources_unregister;
 
+	err = nsim_dev_debugfs_init(nsim_dev);
+	if (err)
+		goto err_dl_unregister;
+
+	err = nsim_bpf_dev_init(nsim_dev);
+	if (err)
+		goto err_debugfs_exit;
+
 	return nsim_dev;
 
+err_debugfs_exit:
+	nsim_dev_debugfs_exit(nsim_dev);
+err_dl_unregister:
+	devlink_unregister(devlink);
 err_resources_unregister:
 	devlink_resources_unregister(devlink, NULL);
 err_fib_destroy:
@@ -227,8 +259,23 @@ void nsim_dev_destroy(struct nsim_dev *nsim_dev)
 {
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 
+	nsim_bpf_dev_exit(nsim_dev);
+	nsim_dev_debugfs_exit(nsim_dev);
 	devlink_unregister(devlink);
 	devlink_resources_unregister(devlink, NULL);
 	nsim_fib_destroy(nsim_dev->fib_data);
 	devlink_free(devlink);
 }
+
+int nsim_dev_init(void)
+{
+	nsim_dev_ddir = debugfs_create_dir(DRV_NAME "_dev", NULL);
+	if (IS_ERR_OR_NULL(nsim_dev_ddir))
+		return -ENOMEM;
+	return 0;
+}
+
+void nsim_dev_exit(void)
+{
+	debugfs_remove_recursive(nsim_dev_ddir);
+}
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 28231bfbc989..c5f4bbb9716f 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -32,24 +32,24 @@ static int nsim_get_port_parent_id(struct net_device *dev,
 {
 	struct netdevsim *ns = netdev_priv(dev);
 
-	ppid->id_len = sizeof(ns->sdev->switch_id);
-	memcpy(&ppid->id, &ns->sdev->switch_id, ppid->id_len);
+	ppid->id_len = sizeof(ns->nsim_dev->nsim_bus_dev->dev.id);
+	memcpy(&ppid->id, &ns->nsim_dev->nsim_bus_dev->dev.id, ppid->id_len);
 	return 0;
 }
 
 static int nsim_init(struct net_device *dev)
 {
 	struct netdevsim *ns = netdev_priv(dev);
-	char sdev_link_name[32];
+	char dev_link_name[32];
 	int err;
 
 	ns->ddir = debugfs_create_dir(netdev_name(dev), nsim_ddir);
 	if (IS_ERR_OR_NULL(ns->ddir))
 		return -ENOMEM;
 
-	sprintf(sdev_link_name, "../../" DRV_NAME "_sdev/%u",
-		ns->sdev->switch_id);
-	debugfs_create_symlink("sdev", ns->ddir, sdev_link_name);
+	sprintf(dev_link_name, "../../" DRV_NAME "_dev/%u",
+		ns->nsim_dev->nsim_bus_dev->dev.id);
+	debugfs_create_symlink("dev", ns->ddir, dev_link_name);
 
 	err = nsim_bpf_init(ns);
 	if (err)
@@ -80,7 +80,6 @@ static void nsim_free(struct net_device *dev)
 	nsim_dev_destroy(ns->nsim_dev);
 	nsim_bus_dev_del(ns->nsim_bus_dev);
 	/* netdev and vf state will be freed out of device_release() */
-	nsim_sdev_put(ns->sdev);
 }
 
 static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
@@ -366,31 +365,11 @@ static int nsim_newlink(struct net *src_net, struct net_device *dev,
 			struct netlink_ext_ack *extack)
 {
 	struct netdevsim *ns = netdev_priv(dev);
-	struct netdevsim *joinns = NULL;
 	int err;
 
-	if (tb[IFLA_LINK]) {
-		struct net_device *joindev;
-
-		joindev = __dev_get_by_index(src_net,
-					     nla_get_u32(tb[IFLA_LINK]));
-		if (!joindev)
-			return -ENODEV;
-		if (joindev->netdev_ops != &nsim_netdev_ops)
-			return -EINVAL;
-
-		joinns = netdev_priv(joindev);
-	}
-
-	ns->sdev = nsim_sdev_get(joinns);
-	if (IS_ERR(ns->sdev))
-		return PTR_ERR(ns->sdev);
-
 	ns->nsim_bus_dev = nsim_bus_dev_new(~0, 0);
-	if (IS_ERR(ns->nsim_bus_dev)) {
-		err = PTR_ERR(ns->nsim_bus_dev);
-		goto err_sdev_put;
-	}
+	if (IS_ERR(ns->nsim_bus_dev))
+		return PTR_ERR(ns->nsim_bus_dev);
 
 	SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
 	ns->netdev = dev;
@@ -410,8 +389,6 @@ static int nsim_newlink(struct net *src_net, struct net_device *dev,
 	nsim_dev_destroy(ns->nsim_dev);
 err_dev_del:
 	nsim_bus_dev_del(ns->nsim_bus_dev);
-err_sdev_put:
-	nsim_sdev_put(ns->sdev);
 	return err;
 }
 
@@ -431,13 +408,13 @@ static int __init nsim_module_init(void)
 	if (IS_ERR_OR_NULL(nsim_ddir))
 		return -ENOMEM;
 
-	err = nsim_sdev_init();
+	err = nsim_dev_init();
 	if (err)
 		goto err_debugfs_destroy;
 
 	err = nsim_bus_init();
 	if (err)
-		goto err_sdev_exit;
+		goto err_dev_exit;
 
 	err = rtnl_link_register(&nsim_link_ops);
 	if (err)
@@ -447,8 +424,8 @@ static int __init nsim_module_init(void)
 
 err_bus_exit:
 	nsim_bus_exit();
-err_sdev_exit:
-	nsim_sdev_exit();
+err_dev_exit:
+	nsim_dev_exit();
 err_debugfs_destroy:
 	debugfs_remove_recursive(nsim_ddir);
 	return err;
@@ -458,7 +435,7 @@ static void __exit nsim_module_exit(void)
 {
 	rtnl_link_unregister(&nsim_link_ops);
 	nsim_bus_exit();
-	nsim_sdev_exit();
+	nsim_dev_exit();
 	debugfs_remove_recursive(nsim_ddir);
 }
 
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index cfcd801cecc2..5c03d0f6d285 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -26,37 +26,6 @@
 
 #define NSIM_EA(extack, msg)	NL_SET_ERR_MSG_MOD((extack), msg)
 
-struct bpf_prog;
-struct bpf_offload_dev;
-struct dentry;
-struct nsim_vf_config;
-struct nsim_fib_data;
-
-struct netdevsim_shared_dev {
-	unsigned int refcnt;
-	u32 switch_id;
-
-	struct dentry *ddir;
-
-	struct bpf_offload_dev *bpf_dev;
-
-	bool bpf_bind_accept;
-	u32 bpf_bind_verifier_delay;
-
-	struct dentry *ddir_bpf_bound_progs;
-	u32 prog_id_gen;
-
-	struct list_head bpf_bound_progs;
-	struct list_head bpf_bound_maps;
-};
-
-struct netdevsim;
-
-struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns);
-void nsim_sdev_put(struct netdevsim_shared_dev *sdev);
-int nsim_sdev_init(void);
-void nsim_sdev_exit(void);
-
 #define NSIM_IPSEC_MAX_SA_COUNT		33
 #define NSIM_IPSEC_VALID		BIT(31)
 
@@ -87,7 +56,6 @@ struct netdevsim {
 	struct u64_stats_sync syncp;
 
 	struct nsim_bus_dev *nsim_bus_dev;
-	struct netdevsim_shared_dev *sdev;
 
 	struct dentry *ddir;
 
@@ -107,6 +75,8 @@ struct netdevsim {
 };
 
 #ifdef CONFIG_BPF_SYSCALL
+int nsim_bpf_dev_init(struct nsim_dev *nsim_dev);
+void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev);
 int nsim_bpf_init(struct netdevsim *ns);
 void nsim_bpf_uninit(struct netdevsim *ns);
 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
@@ -114,6 +84,15 @@ int nsim_bpf_disable_tc(struct netdevsim *ns);
 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 			       void *type_data, void *cb_priv);
 #else
+
+static inline int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
+{
+	return 0;
+}
+
+static inline void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
+{
+}
 static inline int nsim_bpf_init(struct netdevsim *ns)
 {
 	return 0;
@@ -152,12 +131,23 @@ enum nsim_resource_id {
 };
 
 struct nsim_dev {
+	struct nsim_bus_dev *nsim_bus_dev;
 	struct nsim_fib_data *fib_data;
+	struct dentry *ddir;
+	struct bpf_offload_dev *bpf_dev;
+	bool bpf_bind_accept;
+	u32 bpf_bind_verifier_delay;
+	struct dentry *ddir_bpf_bound_progs;
+	u32 prog_id_gen;
+	struct list_head bpf_bound_progs;
+	struct list_head bpf_bound_maps;
 };
 
 struct nsim_dev *nsim_dev_create_with_ns(struct nsim_bus_dev *nsim_bus_dev,
 					 struct netdevsim *ns);
 void nsim_dev_destroy(struct nsim_dev *nsim_dev);
+int nsim_dev_init(void);
+void nsim_dev_exit(void);
 
 struct nsim_fib_data *nsim_fib_create(void);
 void nsim_fib_destroy(struct nsim_fib_data *fib_data);
diff --git a/tools/testing/selftests/bpf/test_offload.py b/tools/testing/selftests/bpf/test_offload.py
index a7f95106119f..91dfe876a707 100755
--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -335,7 +335,7 @@ class NetdevSim:
         self.ns = ""
 
         self.dfs_dir = '/sys/kernel/debug/netdevsim/%s' % (self.dev['ifname'])
-        self.sdev_dir = self.dfs_dir + '/sdev/'
+        self.dev_dir = self.dfs_dir + '/dev/'
         self.dfs_refresh()
 
     def __getitem__(self, key):
@@ -368,12 +368,12 @@ class NetdevSim:
         return data.strip()
 
     def dfs_num_bound_progs(self):
-        path = os.path.join(self.sdev_dir, "bpf_bound_progs")
+        path = os.path.join(self.dev_dir, "bpf_bound_progs")
         _, progs = cmd('ls %s' % (path))
         return len(progs.split())
 
     def dfs_get_bound_progs(self, expected):
-        progs = DebugfsDir(os.path.join(self.sdev_dir, "bpf_bound_progs"))
+        progs = DebugfsDir(os.path.join(self.dev_dir, "bpf_bound_progs"))
         if expected is not None:
             if len(progs) != expected:
                 fail(True, "%d BPF programs bound, expected %d" %
@@ -1055,7 +1055,7 @@ try:
 
     start_test("Test if netdev removal waits for translation...")
     delay_msec = 500
-    sim.dfs["sdev/bpf_bind_verifier_delay"] = delay_msec
+    sim.dfs["dev/bpf_bind_verifier_delay"] = delay_msec
     start = time.time()
     cmd_line = "tc filter add dev %s ingress bpf %s da skip_sw" % \
                (sim['ifname'], obj)
-- 
2.17.2

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