netdev - Re: [RFC net-next 3/3] rcv path changes for vrf traffic

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Date:	Mon, 08 Jun 2015 15:05:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	shm@...ulusnetworks.com, nicolas.dichtel@...nd.com,
	dsahern@...il.com, ebiederm@...ssion.com, hadi@...atatu.com,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	roopa@...ulusnetworks.com, gospo@...ulusnetworks.com,
	jtoppins@...ulusnetworks.com, nikolay@...ulusnetworks.com
Subject: Re: [RFC net-next 3/3] rcv path changes for vrf traffic

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Mon, 08 Jun 2015 21:58:37 +0200

> +static inline u32 ipv4_idev_rt_table(const struct net_device *dev)
> +{
> +       u32 table_id;
> +
> +       rcu_read_lock();
> +       table_id = __in_dev_get_rcu(dev)->rt_table_id;
> +       rcu_read_unlock();
> +
> +       return table_id != RT_TABLE_UNSPEC ? table_id : RT_TABLE_LOCAL;
> +}

It's a real shame you have to do all of this RCU locking and inetdev
deref, because in more than half of the call sites the idev is already
available.
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