On Wed, 10 Apr 2024 16:02:00 +0200 Julien Panis wrote: > > You shouldn't build the skb upfront any more. Give the page to the HW, > > once HW sends you a completion - build the skbs. If build fails > > (allocation failure) just give the page back to HW. If it succeeds, > > however, you'll get a skb which is far more likely to be cache hot. > > Not sure I get this point. > > "Give the page to the HW" = Do you mean that I should dma_map_single() > a full page (|PAGE_SIZE|) in am65_cpsw_nuss_rx_push() ?
Yes, I think so. I think that's what you effectively do now anyway, you just limit the len and wrap it in an skb. But am65_cpsw_nuss_rx_push() will effectively get that page back from skb->data and map it.
