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Message-ID: <20240710203031.188081-3-anthony.l.nguyen@intel.com>
Date: Wed, 10 Jul 2024 13:30:18 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
edumazet@...gle.com,
netdev@...r.kernel.org
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
anthony.l.nguyen@...el.com,
nex.sw.ncis.osdt.itp.upstreaming@...el.com,
lihong.yang@...el.com,
willemb@...gle.com,
almasrymina@...gle.com
Subject: [PATCH net-next 02/14] page_pool: use __cacheline_group_{begin, end}_aligned()
From: Alexander Lobakin <aleksander.lobakin@...el.com>
Instead of doing __cacheline_group_begin() __aligned(), use the new
__cacheline_group_{begin,end}_aligned(), so that it will take care
of the group alignment itself.
Also replace open-coded `4 * sizeof(long)` in two places with
a definition.
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
include/net/page_pool/types.h | 22 ++++++++++++----------
net/core/page_pool.c | 3 ++-
2 files changed, 14 insertions(+), 11 deletions(-)
diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index b70bcc14ceda..50569fed7868 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -129,6 +129,16 @@ struct page_pool_stats {
};
#endif
+/* The whole frag API block must stay within one cacheline. On 32-bit systems,
+ * sizeof(long) == sizeof(int), so that the block size is ``3 * sizeof(long)``.
+ * On 64-bit systems, the actual size is ``2 * sizeof(long) + sizeof(int)``.
+ * The closest pow-2 to both of them is ``4 * sizeof(long)``, so just use that
+ * one for simplicity.
+ * Having it aligned to a cacheline boundary may be excessive and doesn't bring
+ * any good.
+ */
+#define PAGE_POOL_FRAG_GROUP_ALIGN (4 * sizeof(long))
+
struct page_pool {
struct page_pool_params_fast p;
@@ -142,19 +152,11 @@ struct page_pool {
bool system:1; /* This is a global percpu pool */
#endif
- /* The following block must stay within one cacheline. On 32-bit
- * systems, sizeof(long) == sizeof(int), so that the block size is
- * ``3 * sizeof(long)``. On 64-bit systems, the actual size is
- * ``2 * sizeof(long) + sizeof(int)``. The closest pow-2 to both of
- * them is ``4 * sizeof(long)``, so just use that one for simplicity.
- * Having it aligned to a cacheline boundary may be excessive and
- * doesn't bring any good.
- */
- __cacheline_group_begin(frag) __aligned(4 * sizeof(long));
+ __cacheline_group_begin_aligned(frag, PAGE_POOL_FRAG_GROUP_ALIGN);
long frag_users;
netmem_ref frag_page;
unsigned int frag_offset;
- __cacheline_group_end(frag);
+ __cacheline_group_end_aligned(frag, PAGE_POOL_FRAG_GROUP_ALIGN);
struct delayed_work release_dw;
void (*disconnect)(void *pool);
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 855271a6cad2..2abe6e919224 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -178,7 +178,8 @@ static void page_pool_struct_check(void)
CACHELINE_ASSERT_GROUP_MEMBER(struct page_pool, frag, frag_users);
CACHELINE_ASSERT_GROUP_MEMBER(struct page_pool, frag, frag_page);
CACHELINE_ASSERT_GROUP_MEMBER(struct page_pool, frag, frag_offset);
- CACHELINE_ASSERT_GROUP_SIZE(struct page_pool, frag, 4 * sizeof(long));
+ CACHELINE_ASSERT_GROUP_SIZE(struct page_pool, frag,
+ PAGE_POOL_FRAG_GROUP_ALIGN);
}
static int page_pool_init(struct page_pool *pool,
--
2.41.0
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