XSK_NEXT_PG_CONTIG_MASK
xskb->frame_dma = (dma_pages[addr >> PAGE_SHIFT] & ~XSK_NEXT_PG_CONTIG_MASK) +
!(pool->dma_pages[addr >> PAGE_SHIFT] & XSK_NEXT_PG_CONTIG_MASK);
*dma &= ~XSK_NEXT_PG_CONTIG_MASK;
dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK;
dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK;
~XSK_NEXT_PG_CONTIG_MASK) +