PSARC 2007/229 add afe driver to Solaris (update)

[Randy Fishel]

On Tue, 24 Jul 2007, Garrett D'Amore wrote:

> Darren Reed wrote:
> > Garrett D'Amore wrote:
> > > ...
> > >   rx_max_loanup - maximum number of outstanding packets that will be
> > > loaned up to the upper stack without bcopy'ing (default = 128)
> > > 
> > > Tuning these would be either for performance tweaking (which we don't
> > > expect to be necessary), or (in the case of rx_max_loanup) to prevent the
> > > upper layers from holding mblks.  (Setting rx_max_loanup == 0 may
> > > facilitate DDI detach, since the driver will refuse to detach while the
> > > upper layers are holding message blocks that have been loaned up... as the
> > > device's instance is required to properly tear down the DMA bindings for
> > > those buffers.  Note that the device is normally DR safe, although IPv6
> > > in.ndpd seems to like to hold on to received mblks perhaps longer than it
> > > should.)
> > 
> > 
> > Reading what you're saying about rx_max_loanup here, are there implications
> > for modunload'ing if rx_max_loanup is non-0?
> 
> If the upper layer stacks "hold" a loaned up mblk, then yes, you will be
> unable to modunload, or even DR detach, the device.

  As DR and CPR have similar entry points, will this "hold" affect the 
ability of a device to suspend?


	---- Randy