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Date: Wed, 8 Feb 2023 22:06:42 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
bpf@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next] net: skbuff: drop the word head from skb cache
skbuff_head_cache is misnamed (perhaps for historical reasons?)
because it does not hold heads. Head is the buffer which skb->data
points to, and also where shinfo lives. struct sk_buff is a metadata
structure, not the head.
Eric recently added skb_small_head_cache (which allocates actual
head buffers), let that serve as an excuse to finally clean this up :)
Leave the user-space visible name intact, it could possibly be uAPI.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
include/linux/skbuff.h | 2 +-
kernel/bpf/cpumap.c | 2 +-
net/bpf/test_run.c | 2 +-
net/core/skbuff.c | 31 +++++++++++++++----------------
net/core/xdp.c | 5 ++---
5 files changed, 20 insertions(+), 22 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c3df3b55da97..47ab28a37f2f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1243,7 +1243,7 @@ static inline void consume_skb(struct sk_buff *skb)
void __consume_stateless_skb(struct sk_buff *skb);
void __kfree_skb(struct sk_buff *skb);
-extern struct kmem_cache *skbuff_head_cache;
+extern struct kmem_cache *skbuff_cache;
void kfree_skb_partial(struct sk_buff *skb, bool head_stolen);
bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index e0b2d016f0bf..d2110c1f6fa6 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -361,7 +361,7 @@ static int cpu_map_kthread_run(void *data)
/* Support running another XDP prog on this CPU */
nframes = cpu_map_bpf_prog_run(rcpu, frames, xdp_n, &stats, &list);
if (nframes) {
- m = kmem_cache_alloc_bulk(skbuff_head_cache, gfp, nframes, skbs);
+ m = kmem_cache_alloc_bulk(skbuff_cache, gfp, nframes, skbs);
if (unlikely(m == 0)) {
for (i = 0; i < nframes; i++)
skbs[i] = NULL; /* effect: xdp_return_frame */
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 8da0d73b368e..2b954326894f 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -234,7 +234,7 @@ static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
int i, n;
LIST_HEAD(list);
- n = kmem_cache_alloc_bulk(skbuff_head_cache, gfp, nframes, (void **)skbs);
+ n = kmem_cache_alloc_bulk(skbuff_cache, gfp, nframes, (void **)skbs);
if (unlikely(n == 0)) {
for (i = 0; i < nframes; i++)
xdp_return_frame(frames[i]);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index bdb1e015e32b..23779b68f7d2 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -84,7 +84,7 @@
#include "dev.h"
#include "sock_destructor.h"
-struct kmem_cache *skbuff_head_cache __ro_after_init;
+struct kmem_cache *skbuff_cache __ro_after_init;
static struct kmem_cache *skbuff_fclone_cache __ro_after_init;
#ifdef CONFIG_SKB_EXTENSIONS
static struct kmem_cache *skbuff_ext_cache __ro_after_init;
@@ -285,7 +285,7 @@ static struct sk_buff *napi_skb_cache_get(void)
struct sk_buff *skb;
if (unlikely(!nc->skb_count)) {
- nc->skb_count = kmem_cache_alloc_bulk(skbuff_head_cache,
+ nc->skb_count = kmem_cache_alloc_bulk(skbuff_cache,
GFP_ATOMIC,
NAPI_SKB_CACHE_BULK,
nc->skb_cache);
@@ -294,7 +294,7 @@ static struct sk_buff *napi_skb_cache_get(void)
}
skb = nc->skb_cache[--nc->skb_count];
- kasan_unpoison_object_data(skbuff_head_cache, skb);
+ kasan_unpoison_object_data(skbuff_cache, skb);
return skb;
}
@@ -352,7 +352,7 @@ struct sk_buff *slab_build_skb(void *data)
struct sk_buff *skb;
unsigned int size;
- skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC);
+ skb = kmem_cache_alloc(skbuff_cache, GFP_ATOMIC);
if (unlikely(!skb))
return NULL;
@@ -403,7 +403,7 @@ struct sk_buff *__build_skb(void *data, unsigned int frag_size)
{
struct sk_buff *skb;
- skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC);
+ skb = kmem_cache_alloc(skbuff_cache, GFP_ATOMIC);
if (unlikely(!skb))
return NULL;
@@ -585,7 +585,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
u8 *data;
cache = (flags & SKB_ALLOC_FCLONE)
- ? skbuff_fclone_cache : skbuff_head_cache;
+ ? skbuff_fclone_cache : skbuff_cache;
if (sk_memalloc_socks() && (flags & SKB_ALLOC_RX))
gfp_mask |= __GFP_MEMALLOC;
@@ -921,7 +921,7 @@ static void kfree_skbmem(struct sk_buff *skb)
switch (skb->fclone) {
case SKB_FCLONE_UNAVAILABLE:
- kmem_cache_free(skbuff_head_cache, skb);
+ kmem_cache_free(skbuff_cache, skb);
return;
case SKB_FCLONE_ORIG:
@@ -1035,7 +1035,7 @@ static void kfree_skb_add_bulk(struct sk_buff *skb,
sa->skb_array[sa->skb_count++] = skb;
if (unlikely(sa->skb_count == KFREE_SKB_BULK_SIZE)) {
- kmem_cache_free_bulk(skbuff_head_cache, KFREE_SKB_BULK_SIZE,
+ kmem_cache_free_bulk(skbuff_cache, KFREE_SKB_BULK_SIZE,
sa->skb_array);
sa->skb_count = 0;
}
@@ -1060,8 +1060,7 @@ kfree_skb_list_reason(struct sk_buff *segs, enum skb_drop_reason reason)
}
if (sa.skb_count)
- kmem_cache_free_bulk(skbuff_head_cache, sa.skb_count,
- sa.skb_array);
+ kmem_cache_free_bulk(skbuff_cache, sa.skb_count, sa.skb_array);
}
EXPORT_SYMBOL(kfree_skb_list_reason);
@@ -1215,15 +1214,15 @@ static void napi_skb_cache_put(struct sk_buff *skb)
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
u32 i;
- kasan_poison_object_data(skbuff_head_cache, skb);
+ kasan_poison_object_data(skbuff_cache, skb);
nc->skb_cache[nc->skb_count++] = skb;
if (unlikely(nc->skb_count == NAPI_SKB_CACHE_SIZE)) {
for (i = NAPI_SKB_CACHE_HALF; i < NAPI_SKB_CACHE_SIZE; i++)
- kasan_unpoison_object_data(skbuff_head_cache,
+ kasan_unpoison_object_data(skbuff_cache,
nc->skb_cache[i]);
- kmem_cache_free_bulk(skbuff_head_cache, NAPI_SKB_CACHE_HALF,
+ kmem_cache_free_bulk(skbuff_cache, NAPI_SKB_CACHE_HALF,
nc->skb_cache + NAPI_SKB_CACHE_HALF);
nc->skb_count = NAPI_SKB_CACHE_HALF;
}
@@ -1807,7 +1806,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
if (skb_pfmemalloc(skb))
gfp_mask |= __GFP_MEMALLOC;
- n = kmem_cache_alloc(skbuff_head_cache, gfp_mask);
+ n = kmem_cache_alloc(skbuff_cache, gfp_mask);
if (!n)
return NULL;
@@ -4677,7 +4676,7 @@ static void skb_extensions_init(void) {}
void __init skb_init(void)
{
- skbuff_head_cache = kmem_cache_create_usercopy("skbuff_head_cache",
+ skbuff_cache = kmem_cache_create_usercopy("skbuff_head_cache",
sizeof(struct sk_buff),
0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC,
@@ -5550,7 +5549,7 @@ void kfree_skb_partial(struct sk_buff *skb, bool head_stolen)
{
if (head_stolen) {
skb_release_head_state(skb);
- kmem_cache_free(skbuff_head_cache, skb);
+ kmem_cache_free(skbuff_cache, skb);
} else {
__kfree_skb(skb);
}
diff --git a/net/core/xdp.c b/net/core/xdp.c
index a5a7ecf6391c..03938fe6d33a 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -603,8 +603,7 @@ EXPORT_SYMBOL_GPL(xdp_warn);
int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp)
{
- n_skb = kmem_cache_alloc_bulk(skbuff_head_cache, gfp,
- n_skb, skbs);
+ n_skb = kmem_cache_alloc_bulk(skbuff_cache, gfp, n_skb, skbs);
if (unlikely(!n_skb))
return -ENOMEM;
@@ -673,7 +672,7 @@ struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf,
{
struct sk_buff *skb;
- skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC);
+ skb = kmem_cache_alloc(skbuff_cache, GFP_ATOMIC);
if (unlikely(!skb))
return NULL;
--
2.39.1
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