net/core/mp_dmabuf_devmem.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Dmabuf device memory provider.
   4  *
   5  * Authors:     Mina Almasry <almasrymina@google.com>
   6  *
   7  */
   8 #ifndef _NET_MP_DMABUF_DEVMEM_H
   9 #define _NET_MP_DMABUF_DEVMEM_H
  10
  11 #include <net/netmem.h>
  12
  13 #if defined(CONFIG_NET_DEVMEM)
  14 int mp_dmabuf_devmem_init(struct page_pool *pool);
  15
  16 netmem_ref mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp);
  17
  18 void mp_dmabuf_devmem_destroy(struct page_pool *pool);
  19
  20 bool mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem);
  21 #else
  22 static inline int mp_dmabuf_devmem_init(struct page_pool *pool)
  23 {
  24         return -EOPNOTSUPP;
  25 }
  26
  27 static inline netmem_ref
  28 mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp)
  29 {
  30         return 0;
  31 }
  32
  33 static inline void mp_dmabuf_devmem_destroy(struct page_pool *pool)
  34 {
  35 }
  36
  37 static inline bool
  38 mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem)
  39 {
  40         return false;
  41 }
  42 #endif
  43
  44 #endif /* _NET_MP_DMABUF_DEVMEM_H */