gro_cell
struct gro_cell __percpu *cells;
struct gro_cell;
struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
struct gro_cell *cell;
struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
gcells->cells = alloc_percpu(struct gro_cell);
struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);