Re: [dpdk-dev] [PATCH v2 07/15] net/avp: driver registration

[Legacy, Allain]

> -----Original Message-----
> From: Stephen Hemminger [mailto:step...@networkplumber.org]
> 
> What exactly is the spinlock protecting?  The control operations in DPDK are
> defined to be not thread safe. I.e it is responsibility of caller to 
> synchronize.
> Therefore is lock really needed?
The implementation assumes that interrupts (for VM live-migration) may be 
serviced on a thread other than the thread used to do normal device operations 
(i.e., configure, start, stop, etc...).   We use the spinlock to protect the 
device flags and the request/response queue against concurrent access from the 
management thread and the interrupt thread.