From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, andrii@kernel.org,
john.fastabend@gmail.com, lmb@cloudflare.com,
mcroce@microsoft.com, bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH RFC bpf-next 07/10] libbpf: Support init of inner maps in light skeleton.
Date: Fri, 17 Sep 2021 14:57:18 -0700 [thread overview]
Message-ID: <20210917215721.43491-8-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20210917215721.43491-1-alexei.starovoitov@gmail.com>
From: Alexei Starovoitov <ast@kernel.org>
Add ability to initialize inner maps in light skeleton.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
tools/lib/bpf/bpf_gen_internal.h | 1 +
tools/lib/bpf/gen_loader.c | 31 +++++++++++++++++++++++++++++++
tools/lib/bpf/libbpf.c | 6 +++---
3 files changed, 35 insertions(+), 3 deletions(-)
diff --git a/tools/lib/bpf/bpf_gen_internal.h b/tools/lib/bpf/bpf_gen_internal.h
index 1b27faf71080..e7f6ad53aed6 100644
--- a/tools/lib/bpf/bpf_gen_internal.h
+++ b/tools/lib/bpf/bpf_gen_internal.h
@@ -49,5 +49,6 @@ void bpf_gen__record_extern(struct bpf_gen *gen, const char *name, int kind, int
struct bpf_core_relo;
void bpf_gen__record_relo_core(struct bpf_gen *gen, const struct bpf_core_relo *core_relo,
int insn_idx);
+void bpf_gen__populate_outer_map(struct bpf_gen *gen, int outer_map_idx, int key, int inner_map_idx);
#endif
diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c
index 28ecd932713b..35f51d837320 100644
--- a/tools/lib/bpf/gen_loader.c
+++ b/tools/lib/bpf/gen_loader.c
@@ -763,6 +763,37 @@ void bpf_gen__map_update_elem(struct bpf_gen *gen, int map_idx, void *pvalue,
emit_check_err(gen);
}
+void bpf_gen__populate_outer_map(struct bpf_gen *gen, int outer_map_idx, int slot,
+ int inner_map_idx)
+{
+ int attr_size = offsetofend(union bpf_attr, flags);
+ int map_update_attr, key;
+ union bpf_attr attr;
+
+ memset(&attr, 0, attr_size);
+ pr_debug("gen: populate_outer_map: outer %d key %d inner %d\n",
+ outer_map_idx, slot, inner_map_idx);
+
+ key = add_data(gen, &slot, sizeof(slot));
+
+ map_update_attr = add_data(gen, &attr, attr_size);
+ move_stack2blob(gen, attr_field(map_update_attr, map_fd), 4,
+ stack_off(map_fd[outer_map_idx]));
+ emit_rel_store(gen, attr_field(map_update_attr, key), key);
+
+ emit(gen, BPF_MOV64_REG(BPF_REG_1, BPF_REG_10));
+ emit(gen, BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, stack_off(map_fd[inner_map_idx])));
+ emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_2, BPF_PSEUDO_MAP_IDX_VALUE,
+ 0, 0, 0, attr_field(map_update_attr, value)));
+ emit(gen, BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 0));
+
+ /* emit MAP_UPDATE_ELEM command */
+ emit_sys_bpf(gen, BPF_MAP_UPDATE_ELEM, map_update_attr, attr_size);
+ debug_ret(gen, "populate_outer_map outer %d key %d inner %d",
+ outer_map_idx, slot, inner_map_idx);
+ emit_check_err(gen);
+}
+
void bpf_gen__map_freeze(struct bpf_gen *gen, int map_idx)
{
int attr_size = offsetofend(union bpf_attr, map_fd);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index ed2c4f6661fe..b4ebe19c4f6c 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4693,9 +4693,9 @@ static int init_map_slots(struct bpf_object *obj, struct bpf_map *map)
targ_map = map->init_slots[i];
fd = bpf_map__fd(targ_map);
if (obj->gen_loader) {
- pr_warn("// TODO map_update_elem: idx %td key %d value==map_idx %td\n",
- map - obj->maps, i, targ_map - obj->maps);
- return -ENOTSUP;
+ bpf_gen__populate_outer_map(obj->gen_loader,
+ map - obj->maps, i,
+ targ_map - obj->maps);
} else {
err = bpf_map_update_elem(map->fd, &i, &fd, 0);
}
--
2.30.2
next prev parent reply other threads:[~2021-09-17 21:57 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 21:57 [PATCH RFC bpf-next 00/10] bpf: CO-RE support in the kernel Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 01/10] bpf: Prepare relo_core.c for kernel duty Alexei Starovoitov
2021-09-21 21:25 ` Andrii Nakryiko
2021-09-28 14:45 ` Matteo Croce
2021-09-28 16:37 ` Alexei Starovoitov
2021-09-28 17:11 ` Matteo Croce
2021-09-28 20:34 ` Alexei Starovoitov
2021-09-29 12:32 ` Matteo Croce
2021-09-29 17:38 ` Matteo Croce
2021-09-29 23:00 ` Alexei Starovoitov
2021-09-29 23:49 ` Matteo Croce
2021-10-22 0:48 ` Matteo Croce
2021-10-22 0:51 ` Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 02/10] bpf: Define enum bpf_core_relo_kind as uapi Alexei Starovoitov
2021-09-21 21:27 ` Andrii Nakryiko
2021-09-17 21:57 ` [PATCH RFC bpf-next 03/10] bpf: Add proto of bpf_core_apply_relo() Alexei Starovoitov
2021-09-23 11:21 ` Lorenz Bauer
2021-09-23 18:48 ` Andrii Nakryiko
2021-09-17 21:57 ` [PATCH RFC bpf-next 04/10] bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn() Alexei Starovoitov
2021-09-21 21:34 ` Andrii Nakryiko
2021-09-27 18:04 ` Matteo Croce
2021-09-17 21:57 ` [PATCH RFC bpf-next 05/10] libbpf: Use CO-RE in the kernel in light skeleton Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 06/10] libbpf: Make gen_loader data aligned Alexei Starovoitov
2021-09-17 21:57 ` Alexei Starovoitov [this message]
2021-09-17 21:57 ` [PATCH RFC bpf-next 08/10] selftests/bpf: Convert kfunc test with CO-RE to lskel Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 09/10] selftests/bpf: Improve inner_map test coverage Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 10/10] selftests/bpf: Convert map_ptr_kern test to use light skeleton Alexei Starovoitov
2021-09-23 11:33 ` [PATCH RFC bpf-next 00/10] bpf: CO-RE support in the kernel Lorenz Bauer
2021-09-23 18:52 ` Andrii Nakryiko
2021-09-24 23:13 ` Alexei Starovoitov
2021-09-27 16:12 ` Lorenz Bauer
2021-09-27 16:50 ` Alexei Starovoitov
2021-09-28 8:30 ` Lorenz Bauer
2021-09-28 16:35 ` Alexei Starovoitov
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