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From: Veaceslav Falico <vfalico@redhat.com>
To: netdev@vger.kernel.org
Cc: jiri@resnulli.us, Veaceslav Falico <vfalico@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Alexander Duyck <alexander.h.duyck@intel.com>
Subject: [PATCH v3 net-next 04/27] net: add netdev_adjacent->private and allow to use it
Date: Tue, 17 Sep 2013 02:46:29 +0200	[thread overview]
Message-ID: <1379378812-18346-5-git-send-email-vfalico@redhat.com> (raw)
In-Reply-To: <1379378812-18346-1-git-send-email-vfalico@redhat.com>

Currently, even though we can access any linked device, we can't attach
anything to it, which is vital to properly manage them.

To fix this, add a new void *private to netdev_adjacent and functions
setting/getting it (per link), so that we can save, per example, bonding's
slave structures there, per slave device.

netdev_master_upper_dev_link_private(dev, upper_dev, private) links dev to
upper dev and populates the neighbour link only with private.

netdev_lower_dev_get_private{,_rcu}() returns the private, if found.

CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
---

Notes:
    v2  -> v3:
    No change.
    
    v1  -> v2:
    No changes.
    
    RFC -> v1:
    rename neighbour_dev_list/all_dev_list to adj_list/all_adj_list and rework
    the naming of functions - to make the use the pattern
    netdev_(all_)(lower|upper)_* .

 include/linux/netdevice.h |  7 ++++
 net/core/dev.c            | 83 ++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 75 insertions(+), 15 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2a944e5..eab8e36 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2839,8 +2839,15 @@ extern int netdev_upper_dev_link(struct net_device *dev,
 				 struct net_device *upper_dev);
 extern int netdev_master_upper_dev_link(struct net_device *dev,
 					struct net_device *upper_dev);
+extern int netdev_master_upper_dev_link_private(struct net_device *dev,
+						struct net_device *upper_dev,
+						void *private);
 extern void netdev_upper_dev_unlink(struct net_device *dev,
 				    struct net_device *upper_dev);
+extern void *netdev_lower_dev_get_private_rcu(struct net_device *dev,
+					      struct net_device *lower_dev);
+extern void *netdev_lower_dev_get_private(struct net_device *dev,
+					  struct net_device *lower_dev);
 extern int skb_checksum_help(struct sk_buff *skb);
 extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
 	netdev_features_t features, bool tx_path);
diff --git a/net/core/dev.c b/net/core/dev.c
index d277081..6b2b12f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4376,6 +4376,9 @@ struct netdev_adjacent {
 	/* counter for the number of times this device was added to us */
 	u16 ref_nr;
 
+	/* private field for the users */
+	void *private;
+
 	struct list_head list;
 	struct rcu_head rcu;
 };
@@ -4556,7 +4559,7 @@ EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
 static int __netdev_adjacent_dev_insert(struct net_device *dev,
 					struct net_device *adj_dev,
 					bool neighbour, bool master,
-					bool upper)
+					bool upper, void *private)
 {
 	struct netdev_adjacent *adj, *neigh = NULL;
 
@@ -4599,9 +4602,15 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
 			 adj_dev->name);
 
 	if (!upper) {
-		if (neigh)
+		if (neigh) {
+			/* we're backlinging the master device to its
+			 * slave, so save the private in this link.
+			 */
+			if (master)
+				neigh->private = private;
 			list_add_tail_rcu(&neigh->list,
 					  &dev->adj_list.lower);
+		}
 		list_add_tail_rcu(&adj->list, &dev->all_adj_list.lower);
 		return 0;
 	}
@@ -4627,15 +4636,16 @@ static int __netdev_upper_dev_insert(struct net_device *dev,
 				     bool master, bool neighbour)
 {
 	return __netdev_adjacent_dev_insert(dev, udev, neighbour, master,
-					    true);
+					    true, NULL);
 }
 
 static int __netdev_lower_dev_insert(struct net_device *dev,
 				     struct net_device *ldev,
-				     bool neighbour)
+				     bool master, bool neighbour,
+				     void *private)
 {
-	return __netdev_adjacent_dev_insert(dev, ldev, neighbour, false,
-					    false);
+	return __netdev_adjacent_dev_insert(dev, ldev, neighbour, master,
+					    false, private);
 }
 
 void __netdev_adjacent_dev_remove(struct net_device *dev,
@@ -4710,7 +4720,8 @@ static void __netdev_lower_dev_remove_neighbour(struct net_device *dev,
 
 int __netdev_adjacent_dev_insert_link(struct net_device *dev,
 				      struct net_device *upper_dev,
-				      bool master, bool neighbour)
+				      bool master, bool neighbour,
+				      void *private)
 {
 	int ret;
 
@@ -4718,7 +4729,8 @@ int __netdev_adjacent_dev_insert_link(struct net_device *dev,
 	if (ret)
 		return ret;
 
-	ret = __netdev_lower_dev_insert(upper_dev, dev, neighbour);
+	ret = __netdev_lower_dev_insert(upper_dev, dev, master, neighbour,
+					private);
 	if (ret) {
 		__netdev_upper_dev_remove(dev, upper_dev);
 		return ret;
@@ -4730,14 +4742,15 @@ int __netdev_adjacent_dev_insert_link(struct net_device *dev,
 static int __netdev_adjacent_dev_link(struct net_device *dev,
 				      struct net_device *udev)
 {
-	return __netdev_adjacent_dev_insert_link(dev, udev, false, false);
+	return __netdev_adjacent_dev_insert_link(dev, udev, false, false, NULL);
 }
 
 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
 						struct net_device *udev,
-						bool master)
+						bool master, void *priv)
 {
-	return __netdev_adjacent_dev_insert_link(dev, udev, master, true);
+	return __netdev_adjacent_dev_insert_link(dev, udev, master, true,
+						 priv);
 }
 
 void __netdev_adjacent_dev_unlink(struct net_device *dev,
@@ -4756,7 +4769,8 @@ void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
 
 
 static int __netdev_upper_dev_link(struct net_device *dev,
-				   struct net_device *upper_dev, bool master)
+				   struct net_device *upper_dev, bool master,
+				   void *private)
 {
 	struct netdev_adjacent *i, *j, *to_i, *to_j;
 	int ret = 0;
@@ -4776,7 +4790,8 @@ static int __netdev_upper_dev_link(struct net_device *dev,
 	if (master && netdev_master_upper_dev_get(dev))
 		return -EBUSY;
 
-	ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, master);
+	ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, master,
+						   private);
 	if (ret)
 		return ret;
 
@@ -4867,7 +4882,7 @@ rollback_mesh:
 int netdev_upper_dev_link(struct net_device *dev,
 			  struct net_device *upper_dev)
 {
-	return __netdev_upper_dev_link(dev, upper_dev, false);
+	return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
 }
 EXPORT_SYMBOL(netdev_upper_dev_link);
 
@@ -4885,10 +4900,18 @@ EXPORT_SYMBOL(netdev_upper_dev_link);
 int netdev_master_upper_dev_link(struct net_device *dev,
 				 struct net_device *upper_dev)
 {
-	return __netdev_upper_dev_link(dev, upper_dev, true);
+	return __netdev_upper_dev_link(dev, upper_dev, true, NULL);
 }
 EXPORT_SYMBOL(netdev_master_upper_dev_link);
 
+int netdev_master_upper_dev_link_private(struct net_device *dev,
+					 struct net_device *upper_dev,
+					 void *private)
+{
+	return __netdev_upper_dev_link(dev, upper_dev, true, private);
+}
+EXPORT_SYMBOL(netdev_master_upper_dev_link_private);
+
 /**
  * netdev_upper_dev_unlink - Removes a link to upper device
  * @dev: device
@@ -4926,6 +4949,36 @@ void netdev_upper_dev_unlink(struct net_device *dev,
 }
 EXPORT_SYMBOL(netdev_upper_dev_unlink);
 
+void *netdev_lower_dev_get_private_rcu(struct net_device *dev,
+				       struct net_device *lower_dev)
+{
+	struct netdev_adjacent *lower;
+
+	if (!lower_dev)
+		return NULL;
+	lower = __netdev_lower_find_rcu(dev, lower_dev);
+	if (!lower)
+		return NULL;
+
+	return lower->private;
+}
+EXPORT_SYMBOL(netdev_lower_dev_get_private_rcu);
+
+void *netdev_lower_dev_get_private(struct net_device *dev,
+				   struct net_device *lower_dev)
+{
+	struct netdev_adjacent *lower;
+
+	if (!lower_dev)
+		return NULL;
+	lower = __netdev_lower_find(dev, lower_dev);
+	if (!lower)
+		return NULL;
+
+	return lower->private;
+}
+EXPORT_SYMBOL(netdev_lower_dev_get_private);
+
 static void dev_change_rx_flags(struct net_device *dev, int flags)
 {
 	const struct net_device_ops *ops = dev->netdev_ops;
-- 
1.8.4

  parent reply	other threads:[~2013-09-17  0:46 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-17  0:46 [PATCH v3 net-next 00/27] bonding: use neighbours instead of own lists Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 01/27] net: add adj_list to save only neighbours Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 02/27] net: add RCU variant to search for netdev_adjacent link Veaceslav Falico
2013-09-17  1:23   ` Ben Hutchings
2013-09-17  7:34     ` Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 03/27] net: uninline netdev neighbour functions Veaceslav Falico
2013-09-17  0:46 ` Veaceslav Falico [this message]
2013-09-17  0:46 ` [PATCH v3 net-next 05/27] bonding: populate neighbour's private on enslave Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 06/27] bonding: modify bond_get_slave_by_dev() to use neighbours Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 07/27] net: add for_each iterators through neighbour lower link's private Veaceslav Falico
2013-09-17  1:26   ` Ben Hutchings
2013-09-17  7:36     ` Veaceslav Falico
2013-09-17 11:43       ` Eric Dumazet
2013-09-17 12:29         ` Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 08/27] bonding: remove bond_for_each_slave_continue_reverse() Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 09/27] bonding: make bond_for_each_slave() use lower neighbour's private Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 10/27] bonding: use bond_for_each_slave() in bond_uninit() Veaceslav Falico
2013-09-18  9:53   ` Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 11/27] bonding: rework bond_3ad_xmit_xor() to use bond_for_each_slave() only Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 12/27] bonding: rework rlb_next_rx_slave() to use bond_for_each_slave() Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 13/27] bonding: rework bond_find_best_slave() " Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 14/27] bonding: rework bond_ab_arp_probe() " Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 15/27] bonding: remove unused bond_for_each_slave_from() Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 16/27] bonding: add bond_has_slaves() and use it Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 17/27] bonding: convert bond_has_slaves() to use the neighbour list Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 18/27] net: add a possibility to get private from netdev_adjacent->list Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 19/27] bonding: convert first/last slave logic to use neighbours Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 20/27] bonding: remove bond_prev_slave() Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 21/27] net: add a function to get the next private Veaceslav Falico
2013-09-17  1:50   ` Ben Hutchings
2013-09-17 13:55     ` Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 22/27] bonding: use neighbours for bond_next_slave() Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 23/27] bonding: remove slave lists Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 24/27] vlan: link the upper neighbour only after registering Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 25/27] vlan: unlink the upper neighbour before unregistering Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 26/27] net: expose the master link to sysfs, and remove it from bond Veaceslav Falico
2013-09-17  0:46 ` [PATCH v3 net-next 27/27] net: create sysfs symlinks for neighbour devices Veaceslav Falico

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