diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-06-30 09:35:37 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-07-02 14:22:02 -0700 |
| commit | 3715b5df09b92168a4492b48bb7ea70d89f9d8f3 (patch) | |
| tree | 3b03ae2ada9db1a77bfa689549453cdc1d882bef | |
| parent | a8065af3346ebd7c76ebc113451fb3ba94cf7769 (diff) | |
net: add struct net_aligned_data
This structure will hold networking data that must
consume a full cache line to avoid accidental false sharing.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250630093540.3052835-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | include/net/aligned_data.h | 16 | ||||
| -rw-r--r-- | net/core/hotdata.c | 3 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/net/aligned_data.h b/include/net/aligned_data.h new file mode 100644 index 000000000000..cf3329d7c227 --- /dev/null +++ b/include/net/aligned_data.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _NET_ALIGNED_DATA_H +#define _NET_ALIGNED_DATA_H + +#include <linux/types.h> + +/* Structure holding cacheline aligned fields on SMP builds. + * Each field or group should have an ____cacheline_aligned_in_smp + * attribute to ensure no accidental false sharing can happen. + */ +struct net_aligned_data { +}; + +extern struct net_aligned_data net_aligned_data; + +#endif /* _NET_ALIGNED_DATA_H */ diff --git a/net/core/hotdata.c b/net/core/hotdata.c index 0bc893d5f07b..e9c03491ab00 100644 --- a/net/core/hotdata.c +++ b/net/core/hotdata.c @@ -2,6 +2,7 @@ #include <linux/cache.h> #include <linux/jiffies.h> #include <linux/list.h> +#include <net/aligned_data.h> #include <net/hotdata.h> #include <net/proto_memory.h> @@ -22,3 +23,5 @@ struct net_hotdata net_hotdata __cacheline_aligned = { .sysctl_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE }; EXPORT_SYMBOL(net_hotdata); + +struct net_aligned_data net_aligned_data; |