net/xfrm/xfrm_hash.c

Source file repositories/reference/linux-study-clean/net/xfrm/xfrm_hash.c

File Facts

System
Linux kernel
Corpus path
net/xfrm/xfrm_hash.c
Extension
.c
Size
803 bytes
Lines
41
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* xfrm_hash.c: Common hash table code.
 *
 * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
 */

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/xfrm.h>

#include "xfrm_hash.h"

struct hlist_head *xfrm_hash_alloc(unsigned int sz)
{
	struct hlist_head *n;

	if (sz <= PAGE_SIZE)
		n = kzalloc(sz, GFP_KERNEL);
	else if (hashdist)
		n = vzalloc(sz);
	else
		n = (struct hlist_head *)
			__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
					 get_order(sz));

	return n;
}

void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
{
	if (sz <= PAGE_SIZE)
		kfree(n);
	else if (hashdist)
		vfree(n);
	else
		free_pages((unsigned long)n, get_order(sz));
}

Annotation

Implementation Notes