RE : [lwip-devel] igmp implementation

[Frédéric BERNON]

Hi Bill,

In my case, I use a reference count to process that. Of course, the design 
choice depend of your MAC filter design. That's why the job is to do in 
igmp_mac_filter. In all cases, the IP level filter is necessary to avoid that 
two multicast IP giving the same hash key are see as the same one.

 
  
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-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Bill Florac
Envoyé : mardi 10 juillet 2007 21:09
À : address@hidden
Objet : [lwip-devel] igmp implementation


I'm attempting to implement igmp off the latest build.  I see that I need to 
implement at igmp_mac_filter function.  My plan is to implement this in the 
ethernetif.c module.  It would be assigned to the netif structure in the 
low_level_init() function.  The function would then make the correct calls to 
the device driver (Atmel AT91 EMAC) to set or clear the correct hash key.
 
As we leave a group we need to make sure that know another joined group address 
resolves to the same hash key. If so, we don't want to clear the key. There are 
a number of ways to resolve this.  We could keep a some sort of reference count 
or we can test the entire group list as we leave a group. If we do a test, 
either the igmp_mac_filter() would need to have the list of groups or the 
calling function igmp_leavegroup() would have to have access to the hashkey() 
function (making it HW dependent).
 
Any thoughts how to best/better handle this?
 
Bill


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