This is a note to let you know that I've just added the patch titled
net: Find the nesting level of a given device by type.
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-find-the-nesting-level-of-a-given-device-by-type.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Wed May 28 21:03:54 PDT 2014
From: Vlad Yasevich <[email protected]>
Date: Fri, 16 May 2014 17:04:53 -0400
Subject: net: Find the nesting level of a given device by type.
From: Vlad Yasevich <[email protected]>
[ Upstream commit 4085ebe8c31face855fd01ee40372cb4aab1df3a ]
Multiple devices in the kernel can be stacked/nested and they
need to know their nesting level for the purposes of lockdep.
This patch provides a generic function that determines a nesting
level of a particular device by its type (ex: vlan, macvlan, etc).
We only care about nesting of the same type of devices.
For example:
eth0 <- vlan0.10 <- macvlan0 <- vlan1.20
The nesting level of vlan1.20 would be 1, since there is another vlan
in the stack under it.
Signed-off-by: Vlad Yasevich <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/netdevice.h | 10 +++++++++
net/core/dev.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2988,6 +2988,14 @@ void *netdev_lower_get_next_private_rcu(
priv; \
priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
+void *netdev_lower_get_next(struct net_device *dev,
+ struct list_head **iter);
+#define netdev_for_each_lower_dev(dev, ldev, iter) \
+ for (iter = &(dev)->adj_list.lower, \
+ ldev = netdev_lower_get_next(dev, &(iter)); \
+ ldev; \
+ ldev = netdev_lower_get_next(dev, &(iter)))
+
void *netdev_adjacent_get_private(struct list_head *adj_list);
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
@@ -3003,6 +3011,8 @@ void netdev_upper_dev_unlink(struct net_
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev);
+int dev_get_nest_level(struct net_device *dev,
+ bool (*type_check)(struct net_device *dev));
int skb_checksum_help(struct sk_buff *skb);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4605,6 +4605,32 @@ void *netdev_lower_get_next_private_rcu(
EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
/**
+ * netdev_lower_get_next - Get the next device from the lower neighbour
+ * list
+ * @dev: device
+ * @iter: list_head ** of the current position
+ *
+ * Gets the next netdev_adjacent from the dev's lower neighbour
+ * list, starting from iter position. The caller must hold RTNL lock or
+ * its own locking that guarantees that the neighbour lower
+ * list will remain unchainged.
+ */
+void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
+{
+ struct netdev_adjacent *lower;
+
+ lower = list_entry((*iter)->next, struct netdev_adjacent, list);
+
+ if (&lower->list == &dev->adj_list.lower)
+ return NULL;
+
+ *iter = &lower->list;
+
+ return lower->dev;
+}
+EXPORT_SYMBOL(netdev_lower_get_next);
+
+/**
* netdev_lower_get_first_private_rcu - Get the first ->private from the
* lower neighbour list, RCU
* variant
@@ -5054,6 +5080,30 @@ void *netdev_lower_dev_get_private(struc
}
EXPORT_SYMBOL(netdev_lower_dev_get_private);
+
+int dev_get_nest_level(struct net_device *dev,
+ bool (*type_check)(struct net_device *dev))
+{
+ struct net_device *lower = NULL;
+ struct list_head *iter;
+ int max_nest = -1;
+ int nest;
+
+ ASSERT_RTNL();
+
+ netdev_for_each_lower_dev(dev, lower, iter) {
+ nest = dev_get_nest_level(lower, type_check);
+ if (max_nest < nest)
+ max_nest = nest;
+ }
+
+ if (type_check(dev))
+ max_nest++;
+
+ return max_nest;
+}
+EXPORT_SYMBOL(dev_get_nest_level);
+
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
const struct net_device_ops *ops = dev->netdev_ops;
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/net-start-with-correct-mac_len-in-skb_network_protocol.patch
queue-3.14/net-find-the-nesting-level-of-a-given-device-by-type.patch
queue-3.14/mactap-fix-checksum-errors-for-non-gso-packets-in.patch
queue-3.14/net-allow-for-more-then-a-single-subclass-for.patch
queue-3.14/macvlan-fix-lockdep-warnings-with-stacked-macvlan.patch
queue-3.14/revert-macvlan-fix-checksums-error-when-we-are-in.patch
queue-3.14/net-sctp-cache-auth_enable-per-endpoint.patch
queue-3.14/net-sctp-test-if-association-is-dead-in-sctp_wake_up_waiters.patch
queue-3.14/net-sctp-wake-up-all-assocs-if-sndbuf-policy-is-per-socket.patch
queue-3.14/vlan-fix-lockdep-warning-with-stacked-vlan-devices.patch
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