1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_PAGE_POOL_MEMORY_PROVIDER_H
3#define _NET_PAGE_POOL_MEMORY_PROVIDER_H
4
5#include <net/netmem.h>
6#include <net/page_pool/types.h>
7
8struct netdev_rx_queue;
9struct netlink_ext_ack;
10struct sk_buff;
11
12struct memory_provider_ops {
13 netmem_ref (*alloc_netmems)(struct page_pool *pool, gfp_t gfp);
14 bool (*release_netmem)(struct page_pool *pool, netmem_ref netmem);
15 int (*init)(struct page_pool *pool);
16 void (*destroy)(struct page_pool *pool);
17 int (*nl_fill)(void *mp_priv, struct sk_buff *rsp,
18 struct netdev_rx_queue *rxq);
19 void (*uninstall)(void *mp_priv, struct netdev_rx_queue *rxq);
20};
21
22bool net_mp_niov_set_dma_addr(struct net_iov *niov, dma_addr_t addr);
23void net_mp_niov_set_page_pool(struct page_pool *pool, struct net_iov *niov);
24void net_mp_niov_clear_page_pool(struct net_iov *niov);
25
26int net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx,
27 struct pp_memory_provider_params *p);
28int __net_mp_open_rxq(struct net_device *dev, unsigned int rxq_idx,
29 const struct pp_memory_provider_params *p,
30 struct netlink_ext_ack *extack);
31void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx,
32 struct pp_memory_provider_params *old_p);
33void __net_mp_close_rxq(struct net_device *dev, unsigned int rxq_idx,
34 const struct pp_memory_provider_params *old_p);
35
36/**
37 * net_mp_netmem_place_in_cache() - give a netmem to a page pool
38 * @pool: the page pool to place the netmem into
39 * @netmem: netmem to give
40 *
41 * Push an accounted netmem into the page pool's allocation cache. The caller
42 * must ensure that there is space in the cache. It should only be called off
43 * the mp_ops->alloc_netmems() path.
44 */
45static inline void net_mp_netmem_place_in_cache(struct page_pool *pool,
46 netmem_ref netmem)
47{
48 pool->alloc.cache[pool->alloc.count++] = netmem;
49}
50
51#endif
52

source code of linux/include/net/page_pool/memory_provider.h