netdev - Re: [PATCH net-next v1 1/9] net: add netdev_upper_get_next

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Date:	Mon, 26 Aug 2013 22:57:48 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Veaceslav Falico <vfalico@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Cong Wang <amwang@...hat.com>
Subject: Re: [PATCH net-next v1 1/9] net: add netdev_upper_get_next_dev(dev,
 iter)

Mon, Aug 26, 2013 at 10:32:34PM CEST, vfalico@...hat.com wrote:
>This function returns the next dev in the dev->upper_dev_list after the
>struct list_head **iter position, and updates *iter accordingly. Returns
>NULL if there are no devices left.
>
>v1: new patch
>
>CC: "David S. Miller" <davem@...emloft.net>
>CC: Eric Dumazet <edumazet@...gle.com>
>CC: Jiri Pirko <jiri@...nulli.us>
>CC: Alexander Duyck <alexander.h.duyck@...el.com>
>CC: Cong Wang <amwang@...hat.com>
>Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
>---
> net/core/dev.c |   25 +++++++++++++++++++++++++
> 1 files changed, 25 insertions(+), 0 deletions(-)
>
>diff --git a/net/core/dev.c b/net/core/dev.c
>index 1ed2b66..566e99a 100644
>--- a/net/core/dev.c
>+++ b/net/core/dev.c
>@@ -4477,6 +4477,31 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
> }
> EXPORT_SYMBOL(netdev_master_upper_dev_get);
> 
>+/* netdev_upper_get_next_dev - Get the next dev from upper list
>+ * @dev: device
>+ * @iter: list_head ** of the current position
>+ *
>+ * Gets the next device from the dev's upper list, starting from iter
>+ * position. The caller must hold RCU read lock.
>+ */
>+struct net_device *netdev_upper_get_next_dev(struct net_device *dev,
>+					     struct list_head **iter)

		This should be probably rather named
		"netdev_upper_get_next_dev_rcu" That way it is clear
		right away. Also if you introduce non-rcu variant in
		future, you won't introduce confusion :)


>+{
>+	struct netdev_upper *upper;
>+
>+	WARN_ON_ONCE(!rcu_read_lock_held());
>+
>+	upper = list_entry_rcu((*iter)->next, struct netdev_upper, list);
>+
>+	if (&upper->list == &dev->upper_dev_list)
>+		return NULL;
>+
>+	*iter = &upper->list;
>+
>+	return upper->dev;
>+}
>+EXPORT_SYMBOL(netdev_upper_get_next_dev);
>+
> /**
>  * netdev_master_upper_dev_get_rcu - Get master upper device
>  * @dev: device
>-- 
>1.7.1
>
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