RE : [lwip-users] Tx packet list in driver

[Frédéric BERNON]

lwIP don't do any packets buffering, except for TCP. But, in all cases, you 
could also lost some packets on the network. So, you can :

- do a buffering in your driver (but, there will always be a memory limit, so, 
this is not the best solution to my point of view)

- block inside the "low_level_output" until you get some space in your MAC 
buffers (could help to reach the highest data thoughout)

- drop the packet: this solution is the simplest. But, you should "always" 
report ERR_OK, and not an error with the current CVS HEAD code (if you use 
sequential API): else, this error will be forward inside "conn->err", and since 
"conn->err!=ERR_OK" is checked inside most of api_lib functions, you could not 
resend a udp packet, even if a ERR_MEM or a ERR_BUF is not a "fatal" error. 
There is a task open to fix this problem, but, always in progress...

 
  
====================================
Frédéric BERNON 
HYMATOM SA 
Chef de projet informatique 
Microsoft Certified Professional 
Tél. : +33 (0)4-67-87-61-10 
Fax. : +33 (0)4-67-70-85-44 
Email : address@hidden 
Web Site : http://www.hymatom.fr 
====================================
P Avant d'imprimer, penser à l'environnement
 


-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Nicolas Pinault
Envoyé : lundi 17 septembre 2007 14:41
À : Mailing list for lwIP users
Objet : [lwip-users] Tx packet list in driver


Hi all,

With the current version of lwip (CVS one), do I have to buffer tx 
packets in the driver. Or does lwip buffer them when tx is not possible 
(MAC buffer full for example) ?

Nicolas


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