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net: skbuff: remove special handling for SLOB 

Commit c9929f0e34 ("mm/slob: remove CONFIG_SLOB") removes CONFIG_SLOB.
Now, we can also remove special handling for socket buffers with the SLOB
allocator. The code with HAVE_SKB_SMALL_HEAD_CACHE=1 is now the default
behavior for all allocators.

Remove an unnecessary distinction between SLOB and SLAB/SLUB allocator
after the SLOB allocator is gone.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230509071207.28942-1-lukas.bulwahn@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lukas Bulwahn 2023-05-09 09:12:07 +02:00 committed by Jakub Kicinski
parent a731a43e86
commit 559ae55cfc
1 changed files with 0 additions and 17 deletions
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17
net/core/skbuff.c
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@ -92,15 +92,7 @@ static struct kmem_cache *skbuff_fclone_cache __ro_after_init;
static struct kmem_cache *skbuff_ext_cache __ro_after_init;
#endif
/* skb_small_head_cache and related code is only supported
* for CONFIG_SLAB and CONFIG_SLUB.
* As soon as SLOB is removed from the kernel, we can clean up this.
*/
#if !defined(CONFIG_SLOB)
# define HAVE_SKB_SMALL_HEAD_CACHE 1
#endif
#ifdef HAVE_SKB_SMALL_HEAD_CACHE
static struct kmem_cache *skb_small_head_cache __ro_after_init;
#define SKB_SMALL_HEAD_SIZE SKB_HEAD_ALIGN(MAX_TCP_HEADER)
@ -117,7 +109,6 @@ static struct kmem_cache *skb_small_head_cache __ro_after_init;
#define SKB_SMALL_HEAD_HEADROOM \
SKB_WITH_OVERHEAD(SKB_SMALL_HEAD_CACHE_SIZE)
#endif /* HAVE_SKB_SMALL_HEAD_CACHE */
int sysctl_max_skb_frags __read_mostly = MAX_SKB_FRAGS;
EXPORT_SYMBOL(sysctl_max_skb_frags);
@ -562,7 +553,6 @@ static void *kmalloc_reserve(unsigned int *size, gfp_t flags, int node,
void *obj;
obj_size = SKB_HEAD_ALIGN(*size);
#ifdef HAVE_SKB_SMALL_HEAD_CACHE
if (obj_size <= SKB_SMALL_HEAD_CACHE_SIZE &&
!(flags & KMALLOC_NOT_NORMAL_BITS)) {
obj = kmem_cache_alloc_node(skb_small_head_cache,
@ -576,7 +566,6 @@ static void *kmalloc_reserve(unsigned int *size, gfp_t flags, int node,
obj = kmem_cache_alloc_node(skb_small_head_cache, flags, node);
goto out;
}
#endif
*size = obj_size = kmalloc_size_roundup(obj_size);
/*
* Try a regular allocation, when that fails and we're not entitled
@ -898,11 +887,9 @@ static bool skb_pp_recycle(struct sk_buff *skb, void *data, bool napi_safe)
static void skb_kfree_head(void *head, unsigned int end_offset)
{
#ifdef HAVE_SKB_SMALL_HEAD_CACHE
if (end_offset == SKB_SMALL_HEAD_HEADROOM)
kmem_cache_free(skb_small_head_cache, head);
else
#endif
kfree(head);
}
@ -2160,7 +2147,6 @@ int __skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri)
if (likely(skb_end_offset(skb) == saved_end_offset))
return 0;
#ifdef HAVE_SKB_SMALL_HEAD_CACHE
/* We can not change skb->end if the original or new value
* is SKB_SMALL_HEAD_HEADROOM, as it might break skb_kfree_head().
*/
@ -2174,7 +2160,6 @@ int __skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri)
WARN_ON_ONCE(1);
return 0;
}
#endif
shinfo = skb_shinfo(skb);
@ -4768,7 +4753,6 @@ void __init skb_init(void)
0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC,
NULL);
#ifdef HAVE_SKB_SMALL_HEAD_CACHE
/* usercopy should only access first SKB_SMALL_HEAD_HEADROOM bytes.
* struct skb_shared_info is located at the end of skb->head,
* and should not be copied to/from user.
@ -4780,7 +4764,6 @@ void __init skb_init(void)
0,
SKB_SMALL_HEAD_HEADROOM,
NULL);
#endif
skb_extensions_init();
}