caif: prepare support for namespaces

Use struct net to reference CAIF configuration object instead of static variables.
Refactor functions caif_connect_client, caif_disconnect_client and squach
files cfcnfg.c and caif_config_utils.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 36 insertions, 41 deletions

diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c
index 6d1d86b..0e651cf 100644
--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -21,7 +21,6 @@
 #include <net/net_namespace.h>
 #include <net/pkt_sched.h>
 #include <net/caif/caif_device.h>
-#include <net/caif/caif_dev.h>
 #include <net/caif/caif_layer.h>
 #include <net/caif/cfpkt.h>
 #include <net/caif/cfcnfg.h>
@@ -43,11 +42,21 @@ struct caif_device_entry_list {
 };
 
 struct caif_net {
+	struct cfcnfg *cfg;
 	struct caif_device_entry_list caifdevs;
 };
 
 static int caif_net_id;
-static struct cfcnfg *cfg;
+
+struct cfcnfg *get_cfcnfg(struct net *net)
+{
+	struct caif_net *caifn;
+	BUG_ON(!net);
+	caifn = net_generic(net, caif_net_id);
+	BUG_ON(!caifn);
+	return caifn->cfg;
+}
+EXPORT_SYMBOL(get_cfcnfg);
 
 static struct caif_device_entry_list *caif_device_list(struct net *net)
 {
@@ -191,12 +200,17 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
 	struct caif_dev_common *caifdev;
 	enum cfcnfg_phy_preference pref;
 	enum cfcnfg_phy_type phy_type;
+	struct cfcnfg *cfg;
 	struct caif_device_entry_list *caifdevs =
 	    caif_device_list(dev_net(dev));
 
 	if (dev->type != ARPHRD_CAIF)
 		return 0;
 
+	cfg = get_cfcnfg(dev_net(dev));
+	if (cfg == NULL)
+		return 0;
+
 	switch (what) {
 	case NETDEV_REGISTER:
 		caifd = caif_device_alloc(dev);
@@ -235,7 +249,6 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
 				     phy_type,
 				     dev,
 				     &caifd->layer,
-				     0,
 				     pref,
 				     caifdev->use_fcs,
 				     caifdev->use_stx);
@@ -323,35 +336,20 @@ static struct notifier_block caif_device_notifier = {
 	.priority = 0,
 };
 
-int caif_connect_client(struct caif_connect_request *conn_req,
-		       struct cflayer *client_layer, int *ifindex,
-		       int *headroom, int *tailroom)
-{
-	struct cfctrl_link_param param;
-	int ret;
-
-	ret = caif_connect_req_to_link_param(cfg, conn_req, &param);
-	if (ret)
-		return ret;
-	/* Hook up the adaptation layer. */
-	return cfcnfg_add_adaptation_layer(cfg, &param,
-				       client_layer, ifindex,
-				       headroom, tailroom);
-}
-EXPORT_SYMBOL(caif_connect_client);
-
-int caif_disconnect_client(struct cflayer *adap_layer)
-{
-	return cfcnfg_disconn_adapt_layer(cfg, adap_layer);
-}
-EXPORT_SYMBOL(caif_disconnect_client);
-
 /* Per-namespace Caif devices handling */
 static int caif_init_net(struct net *net)
 {
 	struct caif_net *caifn = net_generic(net, caif_net_id);
+	BUG_ON(!caifn);
 	INIT_LIST_HEAD(&caifn->caifdevs.list);
 	mutex_init(&caifn->caifdevs.lock);
+
+	caifn->cfg = cfcnfg_create();
+	if (!caifn->cfg) {
+		pr_warn("can't create cfcnfg\n");
+		return -ENOMEM;
+	}
+
 	return 0;
 }
 
@@ -360,10 +358,17 @@ static void caif_exit_net(struct net *net)
 	struct caif_device_entry *caifd, *tmp;
 	struct caif_device_entry_list *caifdevs =
 	    caif_device_list(net);
+	struct cfcnfg *cfg;
 
 	rtnl_lock();
 	mutex_lock(&caifdevs->lock);
 
+	cfg = get_cfcnfg(net);
+	if (cfg == NULL) {
+		mutex_unlock(&caifdevs->lock);
+		return;
+	}
+
 	list_for_each_entry_safe(caifd, tmp, &caifdevs->list, list) {
 		int i = 0;
 		list_del_rcu(&caifd->list);
@@ -382,7 +387,7 @@ static void caif_exit_net(struct net *net)
 		free_percpu(caifd->pcpu_refcnt);
 		kfree(caifd);
 	}
-
+	cfcnfg_remove(cfg);
 
 	mutex_unlock(&caifdevs->lock);
 	rtnl_unlock();
@@ -400,32 +405,22 @@ static int __init caif_device_init(void)
 {
 	int result;
 
-	cfg = cfcnfg_create();
-	if (!cfg) {
-		pr_warn("can't create cfcnfg\n");
-		goto err_cfcnfg_create_failed;
-	}
 	result = register_pernet_device(&caif_net_ops);
 
-	if (result) {
-		kfree(cfg);
-		cfg = NULL;
+	if (result)
 		return result;
-	}
-	dev_add_pack(&caif_packet_type);
+
 	register_netdevice_notifier(&caif_device_notifier);
+	dev_add_pack(&caif_packet_type);
 
 	return result;
-err_cfcnfg_create_failed:
-	return -ENODEV;
 }
 
 static void __exit caif_device_exit(void)
 {
-	dev_remove_pack(&caif_packet_type);
 	unregister_pernet_device(&caif_net_ops);
 	unregister_netdevice_notifier(&caif_device_notifier);
-	cfcnfg_remove(cfg);
+	dev_remove_pack(&caif_packet_type);
 }
 
 module_init(caif_device_init);