On Fri, May 11, 2007 at 07:30:02AM -0400, jamal ([EMAIL PROTECTED]) wrote: > > I meant no locks during processing of the packets (pci read/write, dma > > setup and so on), of course it is needed to dequeue a packet, but only > > for that operation. > > I dont think you can avoid the lock Evgeniy. You need to protect against > the tx ring having some other things happening to it from the napi poll > or netdev interupts (most of the drivers touch the tx ring on the napi > poll).
As I said there might be another lock, if interrupt handler is shared, or registers are accessed, but it is privite driver's business, which has nothing in common with stack itself. Stack just queues an skb, which, after detached from the tx queue by driver, just does not exist for stack anymore. It can be dequeed with rcu protection even. > cheers, > jamal -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html