forked from luck/tmp_suning_uos_patched
bpf: extend cgroup bpf core to allow multiple cgroup storage types
In order to introduce per-cpu cgroup storage, let's generalize bpf cgroup core to support multiple cgroup storage types. Potentially, per-node cgroup storage can be added later. This commit is mostly a formal change that replaces cgroup_storage pointer with a array of cgroup_storage pointers. It doesn't actually introduce a new storage type, it will be done later. Each bpf program is now able to have one cgroup storage of each type. Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Roman Gushchin
Daniel Borkmann
parent
5bf7a60b8e
commit
8bad74f984
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@ -2,6 +2,7 @@
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#ifndef _BPF_CGROUP_H
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#define _BPF_CGROUP_H
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#include <linux/bpf.h>
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#include <linux/errno.h>
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#include <linux/jump_label.h>
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#include <linux/percpu.h>
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@ -22,7 +23,10 @@ struct bpf_cgroup_storage;
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extern struct static_key_false cgroup_bpf_enabled_key;
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#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
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DECLARE_PER_CPU(void*, bpf_cgroup_storage);
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DECLARE_PER_CPU(void*, bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
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#define for_each_cgroup_storage_type(stype) \
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for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
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struct bpf_cgroup_storage_map;
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@ -43,7 +47,7 @@ struct bpf_cgroup_storage {
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struct bpf_prog_list {
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struct list_head node;
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struct bpf_prog *prog;
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struct bpf_cgroup_storage *storage;
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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE];
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};
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struct bpf_prog_array;
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@ -101,18 +105,29 @@ int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
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int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
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short access, enum bpf_attach_type type);
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static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage *storage)
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static inline enum bpf_cgroup_storage_type cgroup_storage_type(
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struct bpf_map *map)
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{
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struct bpf_storage_buffer *buf;
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if (!storage)
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return;
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buf = READ_ONCE(storage->buf);
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this_cpu_write(bpf_cgroup_storage, &buf->data[0]);
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return BPF_CGROUP_STORAGE_SHARED;
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}
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struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog);
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static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage
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*storage[MAX_BPF_CGROUP_STORAGE_TYPE])
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{
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enum bpf_cgroup_storage_type stype;
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struct bpf_storage_buffer *buf;
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for_each_cgroup_storage_type(stype) {
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if (!storage[stype])
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continue;
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buf = READ_ONCE(storage[stype]->buf);
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this_cpu_write(bpf_cgroup_storage[stype], &buf->data[0]);
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}
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}
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struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
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enum bpf_cgroup_storage_type stype);
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void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage);
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void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
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struct cgroup *cgroup,
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@ -265,13 +280,14 @@ static inline int cgroup_bpf_prog_query(const union bpf_attr *attr,
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return -EINVAL;
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}
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static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage *storage) {}
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static inline void bpf_cgroup_storage_set(
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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) {}
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static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog,
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struct bpf_map *map) { return 0; }
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static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
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struct bpf_map *map) {}
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static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
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struct bpf_prog *prog) { return 0; }
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struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return 0; }
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static inline void bpf_cgroup_storage_free(
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struct bpf_cgroup_storage *storage) {}
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@ -293,6 +309,8 @@ static inline void bpf_cgroup_storage_free(
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#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
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#define for_each_cgroup_storage_type(stype) for (; false; )
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#endif /* CONFIG_CGROUP_BPF */
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#endif /* _BPF_CGROUP_H */
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@ -272,6 +272,13 @@ struct bpf_prog_offload {
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u32 jited_len;
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};
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enum bpf_cgroup_storage_type {
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BPF_CGROUP_STORAGE_SHARED,
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__BPF_CGROUP_STORAGE_MAX
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};
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#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
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struct bpf_prog_aux {
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atomic_t refcnt;
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u32 used_map_cnt;
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@ -289,7 +296,7 @@ struct bpf_prog_aux {
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struct bpf_prog *prog;
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struct user_struct *user;
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u64 load_time; /* ns since boottime */
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struct bpf_map *cgroup_storage;
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struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
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char name[BPF_OBJ_NAME_LEN];
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#ifdef CONFIG_SECURITY
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void *security;
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@ -358,7 +365,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
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*/
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struct bpf_prog_array_item {
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struct bpf_prog *prog;
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struct bpf_cgroup_storage *cgroup_storage;
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struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
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};
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struct bpf_prog_array {
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@ -25,6 +25,7 @@ EXPORT_SYMBOL(cgroup_bpf_enabled_key);
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*/
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void cgroup_bpf_put(struct cgroup *cgrp)
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{
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enum bpf_cgroup_storage_type stype;
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unsigned int type;
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for (type = 0; type < ARRAY_SIZE(cgrp->bpf.progs); type++) {
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@ -34,8 +35,10 @@ void cgroup_bpf_put(struct cgroup *cgrp)
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list_for_each_entry_safe(pl, tmp, progs, node) {
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list_del(&pl->node);
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bpf_prog_put(pl->prog);
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bpf_cgroup_storage_unlink(pl->storage);
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bpf_cgroup_storage_free(pl->storage);
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for_each_cgroup_storage_type(stype) {
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bpf_cgroup_storage_unlink(pl->storage[stype]);
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bpf_cgroup_storage_free(pl->storage[stype]);
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}
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kfree(pl);
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static_branch_dec(&cgroup_bpf_enabled_key);
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}
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@ -97,6 +100,7 @@ static int compute_effective_progs(struct cgroup *cgrp,
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enum bpf_attach_type type,
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struct bpf_prog_array __rcu **array)
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{
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enum bpf_cgroup_storage_type stype;
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struct bpf_prog_array *progs;
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struct bpf_prog_list *pl;
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struct cgroup *p = cgrp;
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@ -125,7 +129,9 @@ static int compute_effective_progs(struct cgroup *cgrp,
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continue;
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progs->items[cnt].prog = pl->prog;
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progs->items[cnt].cgroup_storage = pl->storage;
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for_each_cgroup_storage_type(stype)
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progs->items[cnt].cgroup_storage[stype] =
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pl->storage[stype];
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cnt++;
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}
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} while ((p = cgroup_parent(p)));
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@ -232,7 +238,9 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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{
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struct list_head *progs = &cgrp->bpf.progs[type];
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struct bpf_prog *old_prog = NULL;
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struct bpf_cgroup_storage *storage, *old_storage = NULL;
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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE],
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*old_storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {NULL};
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enum bpf_cgroup_storage_type stype;
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struct bpf_prog_list *pl;
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bool pl_was_allocated;
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int err;
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@ -254,34 +262,44 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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if (prog_list_length(progs) >= BPF_CGROUP_MAX_PROGS)
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return -E2BIG;
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storage = bpf_cgroup_storage_alloc(prog);
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if (IS_ERR(storage))
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return -ENOMEM;
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for_each_cgroup_storage_type(stype) {
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storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
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if (IS_ERR(storage[stype])) {
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storage[stype] = NULL;
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return -ENOMEM;
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}
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}
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if (flags & BPF_F_ALLOW_MULTI) {
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list_for_each_entry(pl, progs, node) {
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if (pl->prog == prog) {
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/* disallow attaching the same prog twice */
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bpf_cgroup_storage_free(storage);
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return -EINVAL;
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}
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}
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pl = kmalloc(sizeof(*pl), GFP_KERNEL);
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if (!pl) {
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bpf_cgroup_storage_free(storage);
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return -ENOMEM;
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}
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pl_was_allocated = true;
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pl->prog = prog;
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pl->storage = storage;
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for_each_cgroup_storage_type(stype)
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pl->storage[stype] = storage[stype];
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list_add_tail(&pl->node, progs);
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} else {
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if (list_empty(progs)) {
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pl = kmalloc(sizeof(*pl), GFP_KERNEL);
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if (!pl) {
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bpf_cgroup_storage_free(storage);
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return -ENOMEM;
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}
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pl_was_allocated = true;
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@ -289,12 +307,15 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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} else {
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pl = list_first_entry(progs, typeof(*pl), node);
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old_prog = pl->prog;
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old_storage = pl->storage;
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bpf_cgroup_storage_unlink(old_storage);
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for_each_cgroup_storage_type(stype) {
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old_storage[stype] = pl->storage[stype];
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bpf_cgroup_storage_unlink(old_storage[stype]);
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}
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pl_was_allocated = false;
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}
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pl->prog = prog;
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pl->storage = storage;
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for_each_cgroup_storage_type(stype)
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pl->storage[stype] = storage[stype];
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}
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cgrp->bpf.flags[type] = flags;
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@ -304,21 +325,27 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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goto cleanup;
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static_branch_inc(&cgroup_bpf_enabled_key);
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if (old_storage)
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bpf_cgroup_storage_free(old_storage);
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for_each_cgroup_storage_type(stype) {
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if (!old_storage[stype])
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continue;
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bpf_cgroup_storage_free(old_storage[stype]);
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}
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if (old_prog) {
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bpf_prog_put(old_prog);
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static_branch_dec(&cgroup_bpf_enabled_key);
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}
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bpf_cgroup_storage_link(storage, cgrp, type);
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_link(storage[stype], cgrp, type);
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return 0;
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cleanup:
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/* and cleanup the prog list */
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pl->prog = old_prog;
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bpf_cgroup_storage_free(pl->storage);
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pl->storage = old_storage;
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bpf_cgroup_storage_link(old_storage, cgrp, type);
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for_each_cgroup_storage_type(stype) {
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bpf_cgroup_storage_free(pl->storage[stype]);
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pl->storage[stype] = old_storage[stype];
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bpf_cgroup_storage_link(old_storage[stype], cgrp, type);
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}
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if (pl_was_allocated) {
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list_del(&pl->node);
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kfree(pl);
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@ -339,6 +366,7 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
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enum bpf_attach_type type, u32 unused_flags)
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{
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struct list_head *progs = &cgrp->bpf.progs[type];
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enum bpf_cgroup_storage_type stype;
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u32 flags = cgrp->bpf.flags[type];
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struct bpf_prog *old_prog = NULL;
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struct bpf_prog_list *pl;
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@ -385,8 +413,10 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
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/* now can actually delete it from this cgroup list */
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list_del(&pl->node);
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bpf_cgroup_storage_unlink(pl->storage);
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bpf_cgroup_storage_free(pl->storage);
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for_each_cgroup_storage_type(stype) {
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bpf_cgroup_storage_unlink(pl->storage[stype]);
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bpf_cgroup_storage_free(pl->storage[stype]);
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}
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kfree(pl);
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if (list_empty(progs))
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/* last program was detached, reset flags to zero */
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@ -194,16 +194,18 @@ const struct bpf_func_proto bpf_get_current_cgroup_id_proto = {
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.ret_type = RET_INTEGER,
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};
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DECLARE_PER_CPU(void*, bpf_cgroup_storage);
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#ifdef CONFIG_CGROUP_BPF
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DECLARE_PER_CPU(void*, bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
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BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
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{
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/* map and flags arguments are not used now,
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* but provide an ability to extend the API
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* for other types of local storages.
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* verifier checks that their values are correct.
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/* flags argument is not used now,
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* but provides an ability to extend the API.
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* verifier checks that its value is correct.
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*/
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return (unsigned long) this_cpu_read(bpf_cgroup_storage);
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enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
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return (unsigned long) this_cpu_read(bpf_cgroup_storage[stype]);
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}
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const struct bpf_func_proto bpf_get_local_storage_proto = {
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@ -214,3 +216,4 @@ const struct bpf_func_proto bpf_get_local_storage_proto = {
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.arg2_type = ARG_ANYTHING,
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};
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#endif
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#endif
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@ -7,7 +7,7 @@
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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DEFINE_PER_CPU(void*, bpf_cgroup_storage);
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DEFINE_PER_CPU(void*, bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
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#ifdef CONFIG_CGROUP_BPF
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@ -251,6 +251,7 @@ const struct bpf_map_ops cgroup_storage_map_ops = {
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int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *_map)
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{
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enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map);
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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int ret = -EBUSY;
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@ -258,11 +259,12 @@ int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *_map)
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if (map->prog && map->prog != prog)
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goto unlock;
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if (prog->aux->cgroup_storage && prog->aux->cgroup_storage != _map)
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if (prog->aux->cgroup_storage[stype] &&
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prog->aux->cgroup_storage[stype] != _map)
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goto unlock;
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map->prog = prog;
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prog->aux->cgroup_storage = _map;
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prog->aux->cgroup_storage[stype] = _map;
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ret = 0;
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unlock:
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spin_unlock_bh(&map->lock);
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@ -272,24 +274,26 @@ int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *_map)
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void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *_map)
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{
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enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map);
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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spin_lock_bh(&map->lock);
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if (map->prog == prog) {
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WARN_ON(prog->aux->cgroup_storage != _map);
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WARN_ON(prog->aux->cgroup_storage[stype] != _map);
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map->prog = NULL;
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prog->aux->cgroup_storage = NULL;
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prog->aux->cgroup_storage[stype] = NULL;
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}
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spin_unlock_bh(&map->lock);
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}
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struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog)
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struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
|
||||
enum bpf_cgroup_storage_type stype)
|
||||
{
|
||||
struct bpf_cgroup_storage *storage;
|
||||
struct bpf_map *map;
|
||||
u32 pages;
|
||||
|
||||
map = prog->aux->cgroup_storage;
|
||||
map = prog->aux->cgroup_storage[stype];
|
||||
if (!map)
|
||||
return NULL;
|
||||
|
||||
|
|
|
|||
|
|
@ -988,10 +988,15 @@ static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
|
|||
/* drop refcnt on maps used by eBPF program and free auxilary data */
|
||||
static void free_used_maps(struct bpf_prog_aux *aux)
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
int i;
|
||||
|
||||
if (aux->cgroup_storage)
|
||||
bpf_cgroup_storage_release(aux->prog, aux->cgroup_storage);
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
if (!aux->cgroup_storage[stype])
|
||||
continue;
|
||||
bpf_cgroup_storage_release(aux->prog,
|
||||
aux->cgroup_storage[stype]);
|
||||
}
|
||||
|
||||
for (i = 0; i < aux->used_map_cnt; i++)
|
||||
bpf_map_put(aux->used_maps[i]);
|
||||
|
|
|
|||
|
|
@ -5171,11 +5171,15 @@ static int replace_map_fd_with_map_ptr(struct bpf_verifier_env *env)
|
|||
/* drop refcnt of maps used by the rejected program */
|
||||
static void release_maps(struct bpf_verifier_env *env)
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
int i;
|
||||
|
||||
if (env->prog->aux->cgroup_storage)
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
if (!env->prog->aux->cgroup_storage[stype])
|
||||
continue;
|
||||
bpf_cgroup_storage_release(env->prog,
|
||||
env->prog->aux->cgroup_storage);
|
||||
env->prog->aux->cgroup_storage[stype]);
|
||||
}
|
||||
|
||||
for (i = 0; i < env->used_map_cnt; i++)
|
||||
bpf_map_put(env->used_maps[i]);
|
||||
|
|
|
|||
|
|
@ -12,7 +12,7 @@
|
|||
#include <linux/sched/signal.h>
|
||||
|
||||
static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx,
|
||||
struct bpf_cgroup_storage *storage)
|
||||
struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE])
|
||||
{
|
||||
u32 ret;
|
||||
|
||||
|
|
@ -28,13 +28,20 @@ static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx,
|
|||
|
||||
static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
|
||||
{
|
||||
struct bpf_cgroup_storage *storage = NULL;
|
||||
struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 };
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
u64 time_start, time_spent = 0;
|
||||
u32 ret = 0, i;
|
||||
|
||||
storage = bpf_cgroup_storage_alloc(prog);
|
||||
if (IS_ERR(storage))
|
||||
return PTR_ERR(storage);
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
|
||||
if (IS_ERR(storage[stype])) {
|
||||
storage[stype] = NULL;
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_free(storage[stype]);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
|
||||
if (!repeat)
|
||||
repeat = 1;
|
||||
|
|
@ -53,7 +60,8 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
|
|||
do_div(time_spent, repeat);
|
||||
*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
|
||||
|
||||
bpf_cgroup_storage_free(storage);
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_free(storage[stype]);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user