netdev - skb header allocation

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Message-ID: <17cd85320908252004r31874732n9e06921d6eae4ad7@mail.gmail.com>
Date:	Tue, 25 Aug 2009 22:04:10 -0500
From:	Chris Ross <chris@...pilednetworks.com>
To:	netdev@...r.kernel.org
Subject: skb header allocation

I have a network driver that acts as a Ethernet device and builds up a
series of outer headers on skb(s) it receives from upper layers. I am
currently using the technique that is in ipip.c to ensure I have
enough room to add my header ...

if (skb_headroom(skb) < some_value || skb_shared(skb) ||
         ((skb_cloned(skb) && !skb_clone_writable(skb, 0))))
   {
      if ((skb2 = skb_realloc_headroom(skb, some_value)) == NULL)
         return -1;

      dev_kfree_skb(skb);
      skb = skb2;
   }

Is this the best practice for a high bandwidth scenario?

thanks

-chris
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