David Miller <da...@davemloft.net> writes: > From: Måns Rullgård <m...@mansr.com> > Date: Wed, 11 Nov 2015 18:25:05 +0000 > >> If the TX DMA channel is idle when start_xmit is called, it can be >> started immediately. Checking the DMA status and starting it if >> idle has to be done atomically somehow. > > ->ndo_start_xmit() is guaranteed to be invoked atomically, protected > by the TX queue spinlock.
Yes, but the DMA needs to be restarted from some other context if it was busy when start_xmit checked. -- Måns Rullgård m...@mansr.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
