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charset="utf-8" Add bpf_gen__init_kern_struct_ops() in gen_loader.c and wire it up in bpf_object__init_kern_struct_ops_maps() when generating a light skeleton. At runtime, the generated loader program: 1. Resolves the BTF ID and module BTF FD of the wrapper struct bpf_struct_ops_ via bpf_btf_find_by_name_kind(). 2. Queries the wrapper struct's size and "data" member offset using bpf_btf_get_struct_member_info(). 3. Resolves the BTF ID and module BTF FD of the target interface struct for program attach_btf_id resolution. 4. Allocates a 4 KB kern_vdata buffer in the loader data blob and populates non-zero scalar/array fields and per-program member offsets and attach indices. Signed-off-by: Siddharth Nayyar --- tools/lib/bpf/bpf_gen_internal.h | 4 + tools/lib/bpf/gen_loader.c | 197 +++++++++++++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.c | 43 ++++----- tools/lib/bpf/libbpf_internal.h | 24 +++++ 4 files changed, 245 insertions(+), 23 deletions(-) diff --git a/tools/lib/bpf/bpf_gen_internal.h b/tools/lib/bpf/bpf_gen_internal.h index 206adf28793d..b424410e8839 100644 --- a/tools/lib/bpf/bpf_gen_internal.h +++ b/tools/lib/bpf/bpf_gen_internal.h @@ -84,5 +84,9 @@ void bpf_gen__record_extern(struct bpf_gen *gen, const char *name, bool is_weak, bool is_typeless, bool is_ld64, int kind, int insn_idx); void bpf_gen__record_relo_core(struct bpf_gen *gen, const struct bpf_core_relo *core_relo); void bpf_gen__populate_outer_map(struct bpf_gen *gen, int outer_map_idx, int key, int inner_map_idx); +void bpf_gen__init_kern_struct_ops(struct bpf_gen *gen, struct btf *btf, + struct bpf_struct_ops *st_ops, + __u32 *vtype_id_off, + unsigned int *val_sz_off); #endif diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c index 555d4757a898..09713c39f71e 100644 --- a/tools/lib/bpf/gen_loader.c +++ b/tools/lib/bpf/gen_loader.c @@ -14,11 +14,14 @@ #include "hashmap.h" #include "bpf_gen_internal.h" #include "skel_internal.h" +#include "relo_core.h" #define MAX_USED_MAPS 64 #define MAX_USED_PROGS 32 #define MAX_KFUNC_DESCS 256 #define MAX_FD_ARRAY_SZ (MAX_USED_MAPS + MAX_KFUNC_DESCS) +#define STRUCT_OPS_VALUE_PREFIX "bpf_struct_ops_" +#define KERN_VDATA_MAX_SIZE 4096 /* The following structure describes the stack layout of the loader program. * In addition R6 contains the pointer to context. @@ -1338,3 +1341,197 @@ void bpf_gen__map_freeze(struct bpf_gen *gen, int map_idx) debug_ret(gen, "map_freeze"); emit_check_err(gen); } + +/* Expects: + * BPF_REG_8 - (btf_obj_fd << 32) | btf_id + * + * Overwrites BPF_REG_{0, 1, 2, 3, 4, 7} + * Returns result in BPF_REG_7 + */ +static void emit_bpf_get_struct_member_info(struct bpf_gen *gen, const char *mname) +{ + emit(gen, BPF_MOV32_REG(BPF_REG_1, BPF_REG_8)); + emit(gen, BPF_MOV64_REG(BPF_REG_2, BPF_REG_8)); + emit(gen, BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 32)); + if (mname) { + int mname_len = strlen(mname) + 1; + int mname_off = add_data(gen, mname, mname_len); + + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_3, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, mname_off)); + emit(gen, BPF_MOV64_IMM(BPF_REG_4, mname_len)); + } else { + emit(gen, BPF_MOV64_IMM(BPF_REG_3, 0)); + emit(gen, BPF_MOV64_IMM(BPF_REG_4, 0)); + } + emit(gen, BPF_EMIT_CALL(BPF_FUNC_btf_get_struct_member_info)); + emit(gen, BPF_MOV64_REG(BPF_REG_7, BPF_REG_0)); + debug_ret(gen, "get_struct_member_info(%s)", mname ?: "NULL"); + emit_check_err(gen); +} + +/* Expects: + * BPF_REG_8 - (btf_obj_fd << 32) | kern_type_id + * BPF_REG_9 - kern_data_off + */ +static void emit_st_ops_member_val(struct bpf_gen *gen, const char *mname, + const void *mdata, __u32 msize, + int kern_vdata_off) +{ + int mdata_off; + + if (libbpf_is_mem_zeroed(mdata, msize)) + return; + + if (msize > KERN_VDATA_MAX_SIZE) { + gen->error = -E2BIG; + return; + } + + mdata_off = add_data(gen, mdata, msize); + emit_bpf_get_struct_member_info(gen, mname); + + /* Extract member byte offset (lower 32 bits of R7), add kern_data_off, and bound it */ + emit(gen, BPF_MOV32_REG(BPF_REG_2, BPF_REG_7)); + emit(gen, BPF_ALU32_REG(BPF_ADD, BPF_REG_2, BPF_REG_9)); + emit(gen, BPF_JMP_IMM(BPF_JLE, BPF_REG_2, KERN_VDATA_MAX_SIZE - msize, 2)); + emit(gen, BPF_MOV64_IMM(BPF_REG_7, -E2BIG)); + emit_check_err(gen); + + /* Copy msize bytes from mdata_off into kern_vdata_off + offset */ + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, kern_vdata_off)); + emit(gen, BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2)); + emit(gen, BPF_MOV64_IMM(BPF_REG_2, msize)); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_3, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, mdata_off)); + emit(gen, BPF_EMIT_CALL(BPF_FUNC_probe_read_kernel)); +} + +/* Expects: + * BPF_REG_8 - (btf_obj_fd << 32) | kern_type_id + * BPF_REG_9 - kern_data_off + */ +static void emit_st_ops_member_prog(struct bpf_gen *gen, const char *mname, + struct bpf_struct_ops *st_ops, __u32 member_idx, + struct bpf_program *prog) +{ + int attach_type_off; + + if (st_ops->progs[member_idx] && st_ops->progs[member_idx] != prog) + bpf_program__set_autoload(st_ops->progs[member_idx], false); + st_ops->progs[member_idx] = prog; + + if (!prog) + return; + + st_ops->kern_func_off[member_idx] = add_data(gen, NULL, sizeof(__u32)); + attach_type_off = add_data(gen, NULL, sizeof(__u32)); + bpf_program__set_expected_attach_type(prog, attach_type_off); + + emit_bpf_get_struct_member_info(gen, mname); + + /* 1. Store member byte offset (lower 32 bits of R7 + kern_data_off) + * into st_ops->kern_func_off[member_idx] + */ + emit(gen, BPF_MOV32_REG(BPF_REG_2, BPF_REG_7)); + emit(gen, BPF_ALU32_REG(BPF_ADD, BPF_REG_2, BPF_REG_9)); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, st_ops->kern_func_off[member_idx])); + emit(gen, BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_2, 0)); + + /* 2. Store member index (upper 32 bits of R7) into attach_type_off */ + emit(gen, BPF_MOV64_REG(BPF_REG_2, BPF_REG_7)); + emit(gen, BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 32)); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, attach_type_off)); + emit(gen, BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_2, 0)); +} + +void bpf_gen__init_kern_struct_ops(struct bpf_gen *gen, struct btf *btf, + struct bpf_struct_ops *st_ops, + __u32 *vtype_id_off, + unsigned int *val_sz_off) +{ + struct ksym_relo_desc relo = { .kind = BTF_KIND_STRUCT }; + const struct btf_member *member; + const struct btf_type *type; + char tname[192], stname[256]; + const char *tname_raw; + __u32 i; + + type = btf__type_by_id(btf, st_ops->type_id); + tname_raw = btf__name_by_offset(btf, type->name_off); + snprintf(tname, sizeof(tname), "%.*s", + (int)bpf_core_essential_name_len(tname_raw), tname_raw); + snprintf(stname, sizeof(stname), "%s%s", STRUCT_OPS_VALUE_PREFIX, tname); + + /* 1. Resolve BTF ID of struct bpf_struct_ops_ */ + *vtype_id_off = add_data(gen, NULL, sizeof(__u64)); + relo.name = stname; + emit_bpf_find_by_name_kind(gen, &relo); + emit_check_err(gen); + emit(gen, BPF_MOV64_REG(BPF_REG_8, BPF_REG_7)); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, *vtype_id_off)); + emit(gen, BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_7, 0)); + + /* 2. Use the BTF ID to find the struct_ops value struct size and "data" offset */ + *val_sz_off = add_data(gen, NULL, sizeof(__u32)); + emit_bpf_get_struct_member_info(gen, NULL); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, *val_sz_off)); + emit(gen, BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_7, 0)); + + emit_bpf_get_struct_member_info(gen, "data"); + emit(gen, BPF_MOV32_REG(BPF_REG_9, BPF_REG_7)); + + /* 3. Resolve BTF ID of struct */ + st_ops->type_id_off = add_data(gen, NULL, sizeof(__u64)); + relo.name = tname; + emit_bpf_find_by_name_kind(gen, &relo); + emit_check_err(gen); + emit(gen, BPF_MOV64_REG(BPF_REG_8, BPF_REG_7)); + emit2(gen, BPF_LD_IMM64_RAW_FULL(BPF_REG_1, BPF_PSEUDO_MAP_IDX_VALUE, + 0, 0, 0, st_ops->type_id_off)); + emit(gen, BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_7, 0)); + + /* 4. Allocate and populate space in the data blob for kern_vdata */ + st_ops->kern_vdata_off = add_data(gen, NULL, KERN_VDATA_MAX_SIZE); + member = btf_members(type); + for (i = 0; i < btf_vlen(type); i++, member++) { + const struct btf_type *mtype; + const char *mname; + void *mdata; + __s64 msize; + __u32 moff; + + mname = btf__name_by_offset(btf, member->name_off); + if (btf_member_bitfield_size(type, i)) { + pr_warn("struct_ops init_kern: bitfield %s is not supported\n", + mname); + gen->error = -ENOTSUP; + return; + } + + moff = member->offset / 8; + mdata = st_ops->data + moff; + msize = btf__resolve_size(btf, member->type); + if (msize < 0) { + pr_warn("struct_ops init_kern: failed to resolve the size of member %s\n", + mname); + gen->error = msize; + return; + } + + mtype = skip_mods_and_typedefs(btf, member->type, NULL); + if (btf_is_ptr(mtype)) { + struct bpf_program *prog = *(void **)mdata; + + emit_st_ops_member_prog(gen, mname, st_ops, i, prog); + } else { + emit_st_ops_member_val(gen, mname, mdata, msize, + st_ops->kern_vdata_off); + } + } +} diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 0e2a93a42908..7754d6640167 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -523,25 +523,6 @@ struct bpf_program { __u32 subprog_cnt; }; -struct bpf_struct_ops { - struct bpf_program **progs; - __u32 *kern_func_off; - /* e.g. struct tcp_congestion_ops in bpf_prog's btf format */ - void *data; - /* e.g. struct bpf_struct_ops_tcp_congestion_ops in - * btf_vmlinux's format. - * struct bpf_struct_ops_tcp_congestion_ops { - * [... some other kernel fields ...] - * struct tcp_congestion_ops data; - * } - * kern_vdata-size == sizeof(struct bpf_struct_ops_tcp_congestion_ops) - * bpf_map__init_kern_struct_ops() will populate the "kern_vdata" - * from "data". - */ - void *kern_vdata; - __u32 type_id; -}; - #define DATA_SEC ".data" #define PERCPU_SEC ".percpu" #define BSS_SEC ".bss" @@ -1462,7 +1443,7 @@ static int bpf_map__init_kern_struct_ops(struct bpf_map *map) static int bpf_object__init_kern_struct_ops_maps(struct bpf_object *obj) { struct bpf_map *map; - size_t i; + size_t i, j; int err; for (i = 0; i < obj->nr_maps; i++) { @@ -1474,9 +1455,25 @@ static int bpf_object__init_kern_struct_ops_maps(struct bpf_object *obj) if (!map->autocreate) continue; - err = bpf_map__init_kern_struct_ops(map); - if (err) - return err; + if (obj->gen_loader) { + const struct btf_type *type; + + bpf_gen__init_kern_struct_ops(obj->gen_loader, obj->btf, + map->st_ops, + &map->btf_vmlinux_value_type_id, + &map->def.value_size); + map->mod_btf_fd = -1; + type = btf__type_by_id(obj->btf, map->st_ops->type_id); + for (j = 0; j < btf_vlen(type); j++) { + if (map->st_ops->progs[j]) + map->st_ops->progs[j]->attach_btf_id = + map->st_ops->type_id_off; + } + } else { + err = bpf_map__init_kern_struct_ops(map); + if (err) + return err; + } } return 0; diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index e90b5336bac0..845d6557c922 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -293,6 +293,30 @@ struct btf_map_def { __u64 map_extra; }; +struct bpf_struct_ops { + struct bpf_program **progs; + __u32 *kern_func_off; + /* e.g. struct tcp_congestion_ops in bpf_prog's btf format */ + void *data; + /* e.g. struct bpf_struct_ops_tcp_congestion_ops in + * btf_vmlinux's format. + * struct bpf_struct_ops_tcp_congestion_ops { + * [... some other kernel fields ...] + * struct tcp_congestion_ops data; + * } + * kern_vdata-size == sizeof(struct bpf_struct_ops_tcp_congestion_ops) + * In standard mode, bpf_map__init_kern_struct_ops() will populate the + * "kern_vdata" buffer from "data". + * In gen_loader mode, bpf_gen__init_kern_struct_ops() will allocate + * space for "kern_vdata" in the loader data blob and record its offset + * in "kern_vdata_off". + */ + void *kern_vdata; + int kern_vdata_off; + int type_id_off; + __u32 type_id; +}; + int parse_btf_map_def(const char *map_name, struct btf *btf, const struct btf_type *def_t, bool strict, struct btf_map_def *map_def, struct btf_map_def *inner_def); -- 2.56.0.455.g6c5a503b38-goog