net/core/mp_dmabuf_devmem.h

File Facts

System

Linux kernel

Corpus path

net/core/mp_dmabuf_devmem.h

Extension

.h

Size

964 bytes

Lines

45

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: implementation source

Status

source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

• Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• net/netmem.h

Detected Declarations

• function mp_dmabuf_devmem_init
• function mp_dmabuf_devmem_alloc_netmems
• function mp_dmabuf_devmem_destroy

Annotated Snippet

#ifndef _NET_MP_DMABUF_DEVMEM_H
#define _NET_MP_DMABUF_DEVMEM_H

#include <net/netmem.h>

#if defined(CONFIG_NET_DEVMEM)
int mp_dmabuf_devmem_init(struct page_pool *pool);

netmem_ref mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp);

void mp_dmabuf_devmem_destroy(struct page_pool *pool);

bool mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem);
#else
static inline int mp_dmabuf_devmem_init(struct page_pool *pool)
{
	return -EOPNOTSUPP;
}

static inline netmem_ref
mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp)
{
	return 0;
}

static inline void mp_dmabuf_devmem_destroy(struct page_pool *pool)
{
}

static inline bool
mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem)
{
	return false;
}
#endif

#endif /* _NET_MP_DMABUF_DEVMEM_H */

Annotation

• Immediate include surface: `net/netmem.h`.
• Detected declarations: `function mp_dmabuf_devmem_init`, `function mp_dmabuf_devmem_alloc_netmems`, `function mp_dmabuf_devmem_destroy`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.