- struct sk_buff * __napi_alloc_skb(struct napi_struct * napi, unsigned int len, gfp_t gfp_mask);
- napi instance this buffer was allocated for
- length to allocate
- get_free_pages mask, passed to alloc_skb and alloc_pages
Allocate a new sk_buff for use in NAPI receive. This buffer will attempt to allocate the head from a special reserved region used only for NAPI Rx allocation. By doing this we can save several CPU cycles by avoiding having to disable and re-enable IRQs.
NULL is returned if there is no free memory.