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bpf: Add BPF_MAP_TYPE_LRU_HASH

Provide a LRU version of the existing BPF_MAP_TYPE_HASH.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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iamkafai authored and davem330 committed Nov 11, 2016
1 parent fd91de7 commit 29ba732acbeece1e34c68483d1ec1f3720fa1bb3
Showing with 260 additions and 14 deletions.
  1. +8 −0 include/uapi/linux/bpf.h
  2. +252 −14 kernel/bpf/hashtab.c
@@ -85,6 +85,7 @@ enum bpf_map_type {
BPF_MAP_TYPE_PERCPU_ARRAY,
BPF_MAP_TYPE_STACK_TRACE,
BPF_MAP_TYPE_CGROUP_ARRAY,
BPF_MAP_TYPE_LRU_HASH,
};
enum bpf_prog_type {
@@ -106,6 +107,13 @@ enum bpf_prog_type {
#define BPF_EXIST 2 /* update existing element */
#define BPF_F_NO_PREALLOC (1U << 0)
/* Instead of having one common LRU list in the
* BPF_MAP_TYPE_LRU_HASH map, use a percpu LRU list
* which can scale and perform better.
* Note, the LRU nodes (including free nodes) cannot be moved
* across different LRU lists.
*/
#define BPF_F_NO_COMMON_LRU (1U << 1)
union bpf_attr {
struct { /* anonymous struct used by BPF_MAP_CREATE command */
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