Re: Modules with list

["Adam J. Richter" <adam@yggdrasil.com>]

Rusty Russell writes:
>In message <200211260649.WAA22216@adam.yggdrasil.com> you write:
>> >TCP for example, sets the destructor function for the skb.  It can be
>> >called an arbitrary time later.  Netfilter modules do a similar thing,
>> >for similar reasons.  You'd better grab a reference to *something*.
>> 
>> 	The ->remove() function of a network device driver will
>> not return until it has freed all receive skb's that it allocated
>> and all transmit skb's that were passed to its transmit function.

>I'm not talking about a device driver, but modularizing the IPv4
>stack.

	I don't see skb->destructor being set in net/ipv4 (although I
see it in other net/ subdirectories).  Anyhow, I don't see why ipv4
would need to increment or decrement a module reference count every
time a packet is sent or received.  It should suffice to do so when a
file descriptor is opened or closed and when a network connection is
created or completely forgotten (if that does not necessarily happen
before the close system call returns).

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