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Message-ID: <20231201120208.15080-2-linyunsheng@huawei.com>
Date: Fri, 1 Dec 2023 20:02:02 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Yunsheng Lin
<linyunsheng@...wei.com>, Alexander Duyck <alexander.duyck@...il.com>, Andrew
Morton <akpm@...ux-foundation.org>, Eric Dumazet <edumazet@...gle.com>,
<linux-mm@...ck.org>
Subject: [PATCH RFC 1/6] mm/page_alloc: modify page_frag_alloc_align() to accept align as an argument
napi_alloc_frag_align() and netdev_alloc_frag_align() accept
align as an argument, and they are thin wrappers around the
__napi_alloc_frag_align() and __netdev_alloc_frag_align() APIs
doing the align and align_mask conversion, in order to call
page_frag_alloc_align() directly.
As __napi_alloc_frag_align() and __netdev_alloc_frag_align()
APIs are only used by the above thin wrappers, it seems that
it makes more sense to remove align and align_mask conversion
and call page_frag_alloc_align() directly. By doing that, we
can also avoid the confusion between napi_alloc_frag_align()
accepting align as an argument and page_frag_alloc_align()
accepting align_align as an argument when they both have the
'align' suffix.
Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
CC: Alexander Duyck <alexander.duyck@...il.com>
---
include/linux/gfp.h | 4 ++--
include/linux/skbuff.h | 22 ++++------------------
mm/page_alloc.c | 6 ++++--
net/core/skbuff.c | 14 +++++++-------
4 files changed, 17 insertions(+), 29 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index de292a007138..bbd75976541e 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -314,12 +314,12 @@ struct page_frag_cache;
extern void __page_frag_cache_drain(struct page *page, unsigned int count);
extern void *page_frag_alloc_align(struct page_frag_cache *nc,
unsigned int fragsz, gfp_t gfp_mask,
- unsigned int align_mask);
+ unsigned int align);
static inline void *page_frag_alloc(struct page_frag_cache *nc,
unsigned int fragsz, gfp_t gfp_mask)
{
- return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u);
+ return page_frag_alloc_align(nc, fragsz, gfp_mask, 1);
}
extern void page_frag_free(void *addr);
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 27998f73183e..c27ed5ab6557 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3182,7 +3182,7 @@ static inline void skb_queue_purge(struct sk_buff_head *list)
unsigned int skb_rbtree_purge(struct rb_root *root);
void skb_errqueue_purge(struct sk_buff_head *list);
-void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask);
+void *netdev_alloc_frag_align(unsigned int fragsz, unsigned int align);
/**
* netdev_alloc_frag - allocate a page fragment
@@ -3193,14 +3193,7 @@ void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask);
*/
static inline void *netdev_alloc_frag(unsigned int fragsz)
{
- return __netdev_alloc_frag_align(fragsz, ~0u);
-}
-
-static inline void *netdev_alloc_frag_align(unsigned int fragsz,
- unsigned int align)
-{
- WARN_ON_ONCE(!is_power_of_2(align));
- return __netdev_alloc_frag_align(fragsz, -align);
+ return netdev_alloc_frag_align(fragsz, 1);
}
struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int length,
@@ -3260,18 +3253,11 @@ static inline void skb_free_frag(void *addr)
page_frag_free(addr);
}
-void *__napi_alloc_frag_align(unsigned int fragsz, unsigned int align_mask);
+void *napi_alloc_frag_align(unsigned int fragsz, unsigned int align);
static inline void *napi_alloc_frag(unsigned int fragsz)
{
- return __napi_alloc_frag_align(fragsz, ~0u);
-}
-
-static inline void *napi_alloc_frag_align(unsigned int fragsz,
- unsigned int align)
-{
- WARN_ON_ONCE(!is_power_of_2(align));
- return __napi_alloc_frag_align(fragsz, -align);
+ return napi_alloc_frag_align(fragsz, 1);
}
struct sk_buff *__napi_alloc_skb(struct napi_struct *napi,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 37ca4f4b62bf..9a16305cf985 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4718,12 +4718,14 @@ EXPORT_SYMBOL(__page_frag_cache_drain);
void *page_frag_alloc_align(struct page_frag_cache *nc,
unsigned int fragsz, gfp_t gfp_mask,
- unsigned int align_mask)
+ unsigned int align)
{
unsigned int size = PAGE_SIZE;
struct page *page;
int offset;
+ WARN_ON_ONCE(!is_power_of_2(align));
+
if (unlikely(!nc->va)) {
refill:
page = __page_frag_cache_refill(nc, gfp_mask);
@@ -4782,7 +4784,7 @@ void *page_frag_alloc_align(struct page_frag_cache *nc,
}
nc->pagecnt_bias--;
- offset &= align_mask;
+ offset &= -align;
nc->offset = offset;
return nc->va + offset;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b157efea5dea..b98d1da4004a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -291,17 +291,17 @@ void napi_get_frags_check(struct napi_struct *napi)
local_bh_enable();
}
-void *__napi_alloc_frag_align(unsigned int fragsz, unsigned int align_mask)
+void *napi_alloc_frag_align(unsigned int fragsz, unsigned int align)
{
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
fragsz = SKB_DATA_ALIGN(fragsz);
- return page_frag_alloc_align(&nc->page, fragsz, GFP_ATOMIC, align_mask);
+ return page_frag_alloc_align(&nc->page, fragsz, GFP_ATOMIC, align);
}
-EXPORT_SYMBOL(__napi_alloc_frag_align);
+EXPORT_SYMBOL(napi_alloc_frag_align);
-void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask)
+void *netdev_alloc_frag_align(unsigned int fragsz, unsigned int align)
{
void *data;
@@ -309,18 +309,18 @@ void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask)
if (in_hardirq() || irqs_disabled()) {
struct page_frag_cache *nc = this_cpu_ptr(&netdev_alloc_cache);
- data = page_frag_alloc_align(nc, fragsz, GFP_ATOMIC, align_mask);
+ data = page_frag_alloc_align(nc, fragsz, GFP_ATOMIC, align);
} else {
struct napi_alloc_cache *nc;
local_bh_disable();
nc = this_cpu_ptr(&napi_alloc_cache);
- data = page_frag_alloc_align(&nc->page, fragsz, GFP_ATOMIC, align_mask);
+ data = page_frag_alloc_align(&nc->page, fragsz, GFP_ATOMIC, align);
local_bh_enable();
}
return data;
}
-EXPORT_SYMBOL(__netdev_alloc_frag_align);
+EXPORT_SYMBOL(netdev_alloc_frag_align);
static struct sk_buff *napi_skb_cache_get(void)
{
--
2.33.0
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