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Commit 7b0c2a05 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

bpf: inline map in map lookup functions for array and htab 



Avoid two successive functions calls for the map in map lookup, first
is the bpf_map_lookup_elem() helper call, and second the callback via
map->ops->map_lookup_elem() to get to the map in map implementation.
Implementation inlines array and htab flavor for map in map lookups.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 89c63074

kernel/bpf/arraymap.c

+26 −0
Original line number Diff line number Diff line
@@ -606,6 +606,31 @@ static void *array_of_map_lookup_elem(struct bpf_map *map, void *key) 
	return READ_ONCE(*inner_map);

}



static u32 array_of_map_gen_lookup(struct bpf_map *map,

				   struct bpf_insn *insn_buf)

{

	u32 elem_size = round_up(map->value_size, 8);

	struct bpf_insn *insn = insn_buf;

	const int ret = BPF_REG_0;

	const int map_ptr = BPF_REG_1;

	const int index = BPF_REG_2;



	*insn++ = BPF_ALU64_IMM(BPF_ADD, map_ptr, offsetof(struct bpf_array, value));

	*insn++ = BPF_LDX_MEM(BPF_W, ret, index, 0);

	*insn++ = BPF_JMP_IMM(BPF_JGE, ret, map->max_entries, 5);

	if (is_power_of_2(elem_size))

		*insn++ = BPF_ALU64_IMM(BPF_LSH, ret, ilog2(elem_size));

	else

		*insn++ = BPF_ALU64_IMM(BPF_MUL, ret, elem_size);

	*insn++ = BPF_ALU64_REG(BPF_ADD, ret, map_ptr);

	*insn++ = BPF_LDX_MEM(BPF_DW, ret, ret, 0);

	*insn++ = BPF_JMP_IMM(BPF_JEQ, ret, 0, 1);

	*insn++ = BPF_JMP_IMM(BPF_JA, 0, 0, 1);

	*insn++ = BPF_MOV64_IMM(ret, 0);



	return insn - insn_buf;

}



const struct bpf_map_ops array_of_maps_map_ops = {

	.map_alloc = array_of_map_alloc,

	.map_free = array_of_map_free,
@@ -615,4 +640,5 @@ const struct bpf_map_ops array_of_maps_map_ops = { 
	.map_fd_get_ptr = bpf_map_fd_get_ptr,

	.map_fd_put_ptr = bpf_map_fd_put_ptr,

	.map_fd_sys_lookup_elem = bpf_map_fd_sys_lookup_elem,

	.map_gen_lookup = array_of_map_gen_lookup,

};

kernel/bpf/hashtab.c

+17 −0
Original line number Diff line number Diff line
@@ -1322,6 +1322,22 @@ static void *htab_of_map_lookup_elem(struct bpf_map *map, void *key) 
	return READ_ONCE(*inner_map);

}



static u32 htab_of_map_gen_lookup(struct bpf_map *map,

				  struct bpf_insn *insn_buf)

{

	struct bpf_insn *insn = insn_buf;

	const int ret = BPF_REG_0;



	*insn++ = BPF_EMIT_CALL((u64 (*)(u64, u64, u64, u64, u64))__htab_map_lookup_elem);

	*insn++ = BPF_JMP_IMM(BPF_JEQ, ret, 0, 2);

	*insn++ = BPF_ALU64_IMM(BPF_ADD, ret,

				offsetof(struct htab_elem, key) +

				round_up(map->key_size, 8));

	*insn++ = BPF_LDX_MEM(BPF_DW, ret, ret, 0);



	return insn - insn_buf;

}



static void htab_of_map_free(struct bpf_map *map)

{

	bpf_map_meta_free(map->inner_map_meta);
@@ -1337,4 +1353,5 @@ const struct bpf_map_ops htab_of_maps_map_ops = { 
	.map_fd_get_ptr = bpf_map_fd_get_ptr,

	.map_fd_put_ptr = bpf_map_fd_put_ptr,

	.map_fd_sys_lookup_elem = bpf_map_fd_sys_lookup_elem,

	.map_gen_lookup = htab_of_map_gen_lookup,

};