[openib-general] Re: RFC userspace CMA

[Michael S. Tsirkin]

Quoting r. Sean Hefty <mshefty at ichips.intel.com>:
> Subject: Re: RFC userspace CMA
> 
> Michael S. Tsirkin wrote:
> > Quoting Sean Hefty <mshefty at ichips.intel.com>:
> > 
> >>I considered, and continue to consider implementing on top of ucm.  The 
> >>drawbacks are: it requires more kernel modules: one for the CM, one for SA 
> >>query, and one for address translation.
> > 
> > 
> > Cant address translation be done with exiting kernel/user interface?
> 
> There's no kernel/user interface for ib_addr, which is what the kernel CMA uses. 
>   To use the ib_at kernel/user interface, ib_at would need to be fixed to avoid 
> crashing the system.  ib_addr is based off of the ib_at/sdp implementations, but 
> limited to ARP translation only.
> 
> It would also require userspace components for other RDMA CMs, such as iWarp.
> 
> - Sean
> 

But I mean, we can already send ARP packets from userspace, cant we?

-- 
MST