netdev - [PATCH 0/2] pktgen: Clone skb to avoid corruption of skbs in ndo_start

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Message-Id: <1311623120-26839-1-git-send-email-nhorman@tuxdriver.com>
Date:	Mon, 25 Jul 2011 15:45:18 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	netdev@...r.kernel.org
Subject: [PATCH 0/2] pktgen: Clone skb to avoid corruption of skbs in ndo_start_xmit methods (v2)

Ok, after considering all your comments, Dave suggested this as an alternate
approach:

1) We create a new priv_flag, IFF_SKB_TX_SHARED, to identify drivers capable of
handling shared skbs.  Default is to not set this flag

2) Modify ether_setup to enable this flag, under the assumption that any driver
calling this  function is initalizing a real ethernet device and as such can
handle shared skbs since they don't tend to store state in the skb struct.
Pktgen can then query this flag when a user script attempts to issue the
clone_skb command and decide if it is to be alowed or not.

3) Audit the network drivers calling ether_setup to identify any code doing so
that can't actualy handle shared skbs and manually disable the new flag.  There
are about 10 drivers in this category.

Thoughts/reviews aprpeciated.
Neil

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