Måns Rullgård <m...@mansr.com> : > Francois Romieu <rom...@fr.zoreil.com> writes: [...] > > It looks like it receives, then tries to allocate new resources. If so > > it may deplete the ring and you should instead consider allocating new > > resources first, then receive data if alloc + map suceeded. > > The hardware receives a frame and stores it in the provided DMA buffer, > then raises an interrupt and moves on to the next buffer. When a buffer > is handed over to the network stack, a new one has to take its place in > the DMA queue. I'm not sure how you're suggesting this be done > differently.
- The hardware raises an interrupt and moves on to the next packet - The driver allocates a new buffer - call it Bob - and maps it. - If it succeeds - The driver unmaps the received packet - The driver hands the received packet to the network stack - The driver hands Bob to the hardware - It it fails - The driver updates the dropped packet stats - The driver recycles the received - yet non-unmapped - packet to the hardware -- Ueimor -- 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