Proposal for changes to network device drivers and network stack (RFC)

[Julian Elischer]

On 9/7/12 4:28 PM, Anuranjan Shukla wrote:
> Hi George,
> Thanks for taking a look. Some answers/comments below.
>
>>> Building FreeBSD without the network stack (network stack as a module)
>>> ----------------------------------------------------------------------
>>>
>> This would be interesting for many reasons, and I think it would be a good
>> contribution.  Does the work you've done in this area handle the VNET
>> stuff that is in the stack as well?  That is, how well does the network
>> stack
>> as a module play with the vnet architecture?
> I'll follow up on this one separately.
>
>>> struct socket {
>>>
>>> 	int so_fibnum;		/* routing domain for this socket */
>>> 	uint32_t so_user_cookie;
>>> +	u_int   so_oqueue;     /* manage send prioritizing based on
>>> application
>>> needs */
>>> +	u_short so_lrid;     /* logical routing */
>>> };
>>>
>> I'd be interested to know how this is used.
> We use the first one as a 'direction' to the forwarding path to select an
> appropriate priority queue to send the packet on. In a generic (i.e.
> Something other than our specific system) system, one could consider
> interesting ways to use queues on a multi queue NIC with help from a
> driver. The second one is for a system with logical routing capabilities
> (multiple routing systems within the same chassis). It gives an
> application opening a socket an option to select the specific logical
> routing instance.

We have the second one with the SETFIB socket option, which allows
a socket to select the routing instance (fib) to use.

it's in the diff, 3 lines up.

> I'll provide smaller pieces of diffs for the kernel without networking
> patch I'd sent out. Let me know if you prefer the device driver interface
> to be in that too.
>
> Thanks,
> Anu
>
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