Re: mbuf data access
Re: mbuf data access
On 7 juin 06, at 19:26, Josh Graessley wrote:
mbuf_len like mbuf_data works whether or not MBUF_EXT is set.
MBUF_EXT just indicates that the actual implementation of the mbuf
is storing the data in an external cluster and not in the mbuf data
structure itself. The one reason this would be important to a
client of the mbuf is the case where you may modify data. In some
cases, the reference to the external cluster may be shared.
Is there a way to find out if those mbufs are shared ?
If this is the case, you will need to duplicate the data before
modifying it.
Duplicate data means duplicate mbuf or the whole chain ?
In my code (in sf_data_in and sf_data_out) , i check out if mbuf was
tagged, in this case filter simply return,
otherwise i set a tag for the mbuf and push it in a queue for re-
injection.
When timer is fired mbuf is retrieve from queue and the mbuf is
processed.
So, do i need to duplicate mbuf before tag ? before push it in
queue ? or before re-injection ?
Jean-Yves
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