Message-Id: <20190418140614.3973-6-jiri@resnulli.us>
Date:   Thu, 18 Apr 2019 16:06:04 +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 05/15] netdevsim: move device registration and related code to bus.c

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

Move netdevsim device registration into bus.c and alongside with that
the related sysfs attributes. Introduce new struct nsim_bus_dev to
represent a netdevsim device on netdevsim bus.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/netdevsim/bus.c       | 142 +++++++++++++++++++++-
 drivers/net/netdevsim/dev.c       |   2 +-
 drivers/net/netdevsim/netdev.c    | 195 +++++++-----------------------
 drivers/net/netdevsim/netdevsim.h |  31 +++--
 4 files changed, 207 insertions(+), 163 deletions(-)

diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index 26b866b72afc..7e83a2e856d3 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -4,15 +4,155 @@
  */
 
 #include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
 
 #include "netdevsim.h"
 
-struct bus_type nsim_bus = {
+static u32 nsim_bus_dev_id;
+
+static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
+{
+	return container_of(dev, struct nsim_bus_dev, dev);
+}
+
+static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
+				   unsigned int num_vfs)
+{
+	nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
+					  sizeof(struct nsim_vf_config),
+					  GFP_KERNEL);
+	if (!nsim_bus_dev->vfconfigs)
+		return -ENOMEM;
+	nsim_bus_dev->num_vfs = num_vfs;
+
+	return 0;
+}
+
+static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
+{
+	kfree(nsim_bus_dev->vfconfigs);
+	nsim_bus_dev->vfconfigs = NULL;
+	nsim_bus_dev->num_vfs = 0;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+	unsigned int num_vfs;
+	int ret;
+
+	ret = kstrtouint(buf, 0, &num_vfs);
+	if (ret)
+		return ret;
+
+	rtnl_lock();
+	if (nsim_bus_dev->num_vfs == num_vfs)
+		goto exit_good;
+	if (nsim_bus_dev->num_vfs && num_vfs) {
+		ret = -EBUSY;
+		goto exit_unlock;
+	}
+
+	if (num_vfs) {
+		ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
+		if (ret)
+			goto exit_unlock;
+	} else {
+		nsim_bus_dev_vfs_disable(nsim_bus_dev);
+	}
+exit_good:
+	ret = count;
+exit_unlock:
+	rtnl_unlock();
+
+	return ret;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_show(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+	return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
+}
+
+static struct device_attribute nsim_bus_dev_numvfs_attr =
+	__ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
+	       nsim_bus_dev_numvfs_store);
+
+static struct attribute *nsim_bus_dev_attrs[] = {
+	&nsim_bus_dev_numvfs_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group nsim_bus_dev_attr_group = {
+	.attrs = nsim_bus_dev_attrs,
+};
+
+static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
+	&nsim_bus_dev_attr_group,
+	NULL,
+};
+
+static void nsim_bus_dev_release(struct device *dev)
+{
+	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+	nsim_bus_dev_vfs_disable(nsim_bus_dev);
+}
+
+static struct device_type nsim_bus_dev_type = {
+	.groups = nsim_bus_dev_attr_groups,
+	.release = nsim_bus_dev_release,
+};
+
+int nsim_num_vf(struct device *dev)
+{
+	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+	return nsim_bus_dev->num_vfs;
+}
+
+static struct bus_type nsim_bus = {
 	.name		= DRV_NAME,
 	.dev_name	= DRV_NAME,
 	.num_vf		= nsim_num_vf,
 };
 
+struct nsim_bus_dev *nsim_bus_dev_new(void)
+{
+	struct nsim_bus_dev *nsim_bus_dev;
+	int err;
+
+	nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
+	if (!nsim_bus_dev)
+		return ERR_PTR(-ENOMEM);
+
+	nsim_bus_dev->dev.id = nsim_bus_dev_id++;
+	nsim_bus_dev->dev.bus = &nsim_bus;
+	nsim_bus_dev->dev.type = &nsim_bus_dev_type;
+	err = device_register(&nsim_bus_dev->dev);
+	if (err)
+		goto err_nsim_bus_dev_free;
+	return nsim_bus_dev;
+
+err_nsim_bus_dev_free:
+	kfree(nsim_bus_dev);
+	return ERR_PTR(err);
+}
+
+void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
+{
+	device_unregister(&nsim_bus_dev->dev);
+	kfree(nsim_bus_dev);
+}
+
 int nsim_bus_init(void)
 {
 	return bus_register(&nsim_bus);
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index c87f0abfaff7..c83c08edf94f 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -199,7 +199,7 @@ static int __nsim_dev_init(struct netdevsim *ns)
 	if (err)
 		goto err_fib_destroy;
 
-	err = devlink_register(devlink, &ns->dev);
+	err = devlink_register(devlink, &ns->nsim_bus_dev->dev);
 	if (err)
 		goto err_resources_unregister;
 
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 7bc0da8cc10d..3407b009929e 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -25,120 +25,8 @@
 
 #include "netdevsim.h"
 
-static u32 nsim_dev_id;
-
-struct nsim_vf_config {
-	int link_state;
-	u16 min_tx_rate;
-	u16 max_tx_rate;
-	u16 vlan;
-	__be16 vlan_proto;
-	u16 qos;
-	u8 vf_mac[ETH_ALEN];
-	bool spoofchk_enabled;
-	bool trusted;
-	bool rss_query_enabled;
-};
-
 static struct dentry *nsim_ddir;
 
-int nsim_num_vf(struct device *dev)
-{
-	struct netdevsim *ns = to_nsim(dev);
-
-	return ns->num_vfs;
-}
-
-static int nsim_vfs_enable(struct netdevsim *ns, unsigned int num_vfs)
-{
-	ns->vfconfigs = kcalloc(num_vfs, sizeof(struct nsim_vf_config),
-				GFP_KERNEL);
-	if (!ns->vfconfigs)
-		return -ENOMEM;
-	ns->num_vfs = num_vfs;
-
-	return 0;
-}
-
-static void nsim_vfs_disable(struct netdevsim *ns)
-{
-	kfree(ns->vfconfigs);
-	ns->vfconfigs = NULL;
-	ns->num_vfs = 0;
-}
-
-static ssize_t
-nsim_numvfs_store(struct device *dev, struct device_attribute *attr,
-		  const char *buf, size_t count)
-{
-	struct netdevsim *ns = to_nsim(dev);
-	unsigned int num_vfs;
-	int ret;
-
-	ret = kstrtouint(buf, 0, &num_vfs);
-	if (ret)
-		return ret;
-
-	rtnl_lock();
-	if (ns->num_vfs == num_vfs)
-		goto exit_good;
-	if (ns->num_vfs && num_vfs) {
-		ret = -EBUSY;
-		goto exit_unlock;
-	}
-
-	if (num_vfs) {
-		ret = nsim_vfs_enable(ns, num_vfs);
-		if (ret)
-			goto exit_unlock;
-	} else {
-		nsim_vfs_disable(ns);
-	}
-exit_good:
-	ret = count;
-exit_unlock:
-	rtnl_unlock();
-
-	return ret;
-}
-
-static ssize_t
-nsim_numvfs_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct netdevsim *ns = to_nsim(dev);
-
-	return sprintf(buf, "%u\n", ns->num_vfs);
-}
-
-static struct device_attribute nsim_numvfs_attr =
-	__ATTR(sriov_numvfs, 0664, nsim_numvfs_show, nsim_numvfs_store);
-
-static struct attribute *nsim_dev_attrs[] = {
-	&nsim_numvfs_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group nsim_dev_attr_group = {
-	.attrs = nsim_dev_attrs,
-};
-
-static const struct attribute_group *nsim_dev_attr_groups[] = {
-	&nsim_dev_attr_group,
-	NULL,
-};
-
-static void nsim_dev_release(struct device *dev)
-{
-	struct netdevsim *ns = to_nsim(dev);
-
-	nsim_vfs_disable(ns);
-}
-
-static struct device_type nsim_dev_type = {
-	.groups = nsim_dev_attr_groups,
-	.release = nsim_dev_release,
-};
-
 static int nsim_get_port_parent_id(struct net_device *dev,
 				   struct netdev_phys_item_id *ppid)
 {
@@ -190,7 +78,7 @@ static void nsim_free(struct net_device *dev)
 	struct netdevsim *ns = netdev_priv(dev);
 
 	nsim_dev_exit(ns);
-	device_unregister(&ns->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);
 }
@@ -271,11 +159,12 @@ nsim_setup_tc_block(struct net_device *dev, struct tc_block_offload *f)
 static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
 	/* Only refuse multicast addresses, zero address can mean unset/any. */
-	if (vf >= ns->num_vfs || is_multicast_ether_addr(mac))
+	if (vf >= nsim_bus_dev->num_vfs || is_multicast_ether_addr(mac))
 		return -EINVAL;
-	memcpy(ns->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
+	memcpy(nsim_bus_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
 
 	return 0;
 }
@@ -284,13 +173,14 @@ static int nsim_set_vf_vlan(struct net_device *dev, int vf,
 			    u16 vlan, u8 qos, __be16 vlan_proto)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs || vlan > 4095 || qos > 7)
+	if (vf >= nsim_bus_dev->num_vfs || vlan > 4095 || qos > 7)
 		return -EINVAL;
 
-	ns->vfconfigs[vf].vlan = vlan;
-	ns->vfconfigs[vf].qos = qos;
-	ns->vfconfigs[vf].vlan_proto = vlan_proto;
+	nsim_bus_dev->vfconfigs[vf].vlan = vlan;
+	nsim_bus_dev->vfconfigs[vf].qos = qos;
+	nsim_bus_dev->vfconfigs[vf].vlan_proto = vlan_proto;
 
 	return 0;
 }
@@ -298,12 +188,13 @@ static int nsim_set_vf_vlan(struct net_device *dev, int vf,
 static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
 
-	ns->vfconfigs[vf].min_tx_rate = min;
-	ns->vfconfigs[vf].max_tx_rate = max;
+	nsim_bus_dev->vfconfigs[vf].min_tx_rate = min;
+	nsim_bus_dev->vfconfigs[vf].max_tx_rate = max;
 
 	return 0;
 }
@@ -311,10 +202,11 @@ static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
-	ns->vfconfigs[vf].spoofchk_enabled = val;
+	nsim_bus_dev->vfconfigs[vf].spoofchk_enabled = val;
 
 	return 0;
 }
@@ -322,10 +214,11 @@ static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
-	ns->vfconfigs[vf].rss_query_enabled = val;
+	nsim_bus_dev->vfconfigs[vf].rss_query_enabled = val;
 
 	return 0;
 }
@@ -333,10 +226,11 @@ static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
-	ns->vfconfigs[vf].trusted = val;
+	nsim_bus_dev->vfconfigs[vf].trusted = val;
 
 	return 0;
 }
@@ -345,21 +239,22 @@ static int
 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
 
 	ivi->vf = vf;
-	ivi->linkstate = ns->vfconfigs[vf].link_state;
-	ivi->min_tx_rate = ns->vfconfigs[vf].min_tx_rate;
-	ivi->max_tx_rate = ns->vfconfigs[vf].max_tx_rate;
-	ivi->vlan = ns->vfconfigs[vf].vlan;
-	ivi->vlan_proto = ns->vfconfigs[vf].vlan_proto;
-	ivi->qos = ns->vfconfigs[vf].qos;
-	memcpy(&ivi->mac, ns->vfconfigs[vf].vf_mac, ETH_ALEN);
-	ivi->spoofchk = ns->vfconfigs[vf].spoofchk_enabled;
-	ivi->trusted = ns->vfconfigs[vf].trusted;
-	ivi->rss_query_en = ns->vfconfigs[vf].rss_query_enabled;
+	ivi->linkstate = nsim_bus_dev->vfconfigs[vf].link_state;
+	ivi->min_tx_rate = nsim_bus_dev->vfconfigs[vf].min_tx_rate;
+	ivi->max_tx_rate = nsim_bus_dev->vfconfigs[vf].max_tx_rate;
+	ivi->vlan = nsim_bus_dev->vfconfigs[vf].vlan;
+	ivi->vlan_proto = nsim_bus_dev->vfconfigs[vf].vlan_proto;
+	ivi->qos = nsim_bus_dev->vfconfigs[vf].qos;
+	memcpy(&ivi->mac, nsim_bus_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
+	ivi->spoofchk = nsim_bus_dev->vfconfigs[vf].spoofchk_enabled;
+	ivi->trusted = nsim_bus_dev->vfconfigs[vf].trusted;
+	ivi->rss_query_en = nsim_bus_dev->vfconfigs[vf].rss_query_enabled;
 
 	return 0;
 }
@@ -367,8 +262,9 @@ nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
 {
 	struct netdevsim *ns = netdev_priv(dev);
+	struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 
-	if (vf >= ns->num_vfs)
+	if (vf >= nsim_bus_dev->num_vfs)
 		return -EINVAL;
 
 	switch (state) {
@@ -380,7 +276,7 @@ static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
 		return -EINVAL;
 	}
 
-	ns->vfconfigs[vf].link_state = state;
+	nsim_bus_dev->vfconfigs[vf].link_state = state;
 
 	return 0;
 }
@@ -490,19 +386,18 @@ static int nsim_newlink(struct net *src_net, struct net_device *dev,
 	if (IS_ERR(ns->sdev))
 		return PTR_ERR(ns->sdev);
 
-	ns->dev.id = nsim_dev_id++;
-	ns->dev.bus = &nsim_bus;
-	ns->dev.type = &nsim_dev_type;
-	err = device_register(&ns->dev);
-	if (err)
+	ns->nsim_bus_dev = nsim_bus_dev_new();
+	if (IS_ERR(ns->nsim_bus_dev)) {
+		err = PTR_ERR(ns->nsim_bus_dev);
 		goto err_sdev_put;
+	}
 
-	SET_NETDEV_DEV(dev, &ns->dev);
+	SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
 	ns->netdev = dev;
 
 	err = nsim_dev_init(ns);
 	if (err)
-		goto err_unreg_dev;
+		goto err_dev_del;
 
 	err = register_netdevice(dev);
 	if (err)
@@ -511,8 +406,8 @@ static int nsim_newlink(struct net *src_net, struct net_device *dev,
 
 err_dev_exit:
 	nsim_dev_exit(ns);
-err_unreg_dev:
-	device_unregister(&ns->dev);
+err_dev_del:
+	nsim_bus_dev_del(ns->nsim_bus_dev);
 err_sdev_put:
 	nsim_sdev_put(ns->sdev);
 	return err;
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 7a144aa7965a..528d1e7d3e6b 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -85,14 +85,11 @@ struct netdevsim {
 	u64 tx_bytes;
 	struct u64_stats_sync syncp;
 
-	struct device dev;
+	struct nsim_bus_dev *nsim_bus_dev;
 	struct netdevsim_shared_dev *sdev;
 
 	struct dentry *ddir;
 
-	unsigned int num_vfs;
-	struct nsim_vf_config *vfconfigs;
-
 	struct bpf_prog	*bpf_offloaded;
 	u32 bpf_offloaded_id;
 
@@ -184,14 +181,26 @@ static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
 }
 #endif
 
-static inline struct netdevsim *to_nsim(struct device *ptr)
-{
-	return container_of(ptr, struct netdevsim, dev);
-}
-
-int nsim_num_vf(struct device *dev);
+struct nsim_vf_config {
+	int link_state;
+	u16 min_tx_rate;
+	u16 max_tx_rate;
+	u16 vlan;
+	__be16 vlan_proto;
+	u16 qos;
+	u8 vf_mac[ETH_ALEN];
+	bool spoofchk_enabled;
+	bool trusted;
+	bool rss_query_enabled;
+};
 
-extern struct bus_type nsim_bus;
+struct nsim_bus_dev {
+	struct device dev;
+	unsigned int num_vfs;
+	struct nsim_vf_config *vfconfigs;
+};
 
+struct nsim_bus_dev *nsim_bus_dev_new(void);
+void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
 int nsim_bus_init(void);
 void nsim_bus_exit(void);
-- 
2.17.2

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