linux/kernel/bpf/bpf_cgrp_storage.c
Yonghong Song 3144bfa507 bpf: Fix a compilation failure with clang lto build
When building the kernel with clang lto (CONFIG_LTO_CLANG_FULL=y), the
following compilation error will appear:

  $ make LLVM=1 LLVM_IAS=1 -j
  ...
  ld.lld: error: ld-temp.o <inline asm>:26889:1: symbol 'cgroup_storage_map_btf_ids' is already defined
  cgroup_storage_map_btf_ids:;
  ^
  make[1]: *** [/.../bpf-next/scripts/Makefile.vmlinux_o:61: vmlinux.o] Error 1

In local_storage.c, we have
  BTF_ID_LIST_SINGLE(cgroup_storage_map_btf_ids, struct, bpf_local_storage_map)
Commit c4bcfb38a9 ("bpf: Implement cgroup storage available to
non-cgroup-attached bpf progs") added the above identical BTF_ID_LIST_SINGLE
definition in bpf_cgrp_storage.c. With duplicated definitions, llvm linker
complains with lto build.

Also, extracting btf_id of 'struct bpf_local_storage_map' is defined four times
for sk, inode, task and cgrp local storages. Let us define a single global one
with a different name than cgroup_storage_map_btf_ids, which also fixed
the lto compilation error.

Fixes: c4bcfb38a9 ("bpf: Implement cgroup storage available to non-cgroup-attached bpf progs")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221130052147.1591625-1-yhs@fb.com
2022-11-30 17:13:25 -08:00

247 lines
6.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
*/
#include <linux/types.h>
#include <linux/bpf.h>
#include <linux/bpf_local_storage.h>
#include <uapi/linux/btf.h>
#include <linux/btf_ids.h>
DEFINE_BPF_STORAGE_CACHE(cgroup_cache);
static DEFINE_PER_CPU(int, bpf_cgrp_storage_busy);
static void bpf_cgrp_storage_lock(void)
{
migrate_disable();
this_cpu_inc(bpf_cgrp_storage_busy);
}
static void bpf_cgrp_storage_unlock(void)
{
this_cpu_dec(bpf_cgrp_storage_busy);
migrate_enable();
}
static bool bpf_cgrp_storage_trylock(void)
{
migrate_disable();
if (unlikely(this_cpu_inc_return(bpf_cgrp_storage_busy) != 1)) {
this_cpu_dec(bpf_cgrp_storage_busy);
migrate_enable();
return false;
}
return true;
}
static struct bpf_local_storage __rcu **cgroup_storage_ptr(void *owner)
{
struct cgroup *cg = owner;
return &cg->bpf_cgrp_storage;
}
void bpf_cgrp_storage_free(struct cgroup *cgroup)
{
struct bpf_local_storage *local_storage;
bool free_cgroup_storage = false;
unsigned long flags;
rcu_read_lock();
local_storage = rcu_dereference(cgroup->bpf_cgrp_storage);
if (!local_storage) {
rcu_read_unlock();
return;
}
bpf_cgrp_storage_lock();
raw_spin_lock_irqsave(&local_storage->lock, flags);
free_cgroup_storage = bpf_local_storage_unlink_nolock(local_storage);
raw_spin_unlock_irqrestore(&local_storage->lock, flags);
bpf_cgrp_storage_unlock();
rcu_read_unlock();
if (free_cgroup_storage)
kfree_rcu(local_storage, rcu);
}
static struct bpf_local_storage_data *
cgroup_storage_lookup(struct cgroup *cgroup, struct bpf_map *map, bool cacheit_lockit)
{
struct bpf_local_storage *cgroup_storage;
struct bpf_local_storage_map *smap;
cgroup_storage = rcu_dereference_check(cgroup->bpf_cgrp_storage,
bpf_rcu_lock_held());
if (!cgroup_storage)
return NULL;
smap = (struct bpf_local_storage_map *)map;
return bpf_local_storage_lookup(cgroup_storage, smap, cacheit_lockit);
}
static void *bpf_cgrp_storage_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_local_storage_data *sdata;
struct cgroup *cgroup;
int fd;
fd = *(int *)key;
cgroup = cgroup_get_from_fd(fd);
if (IS_ERR(cgroup))
return ERR_CAST(cgroup);
bpf_cgrp_storage_lock();
sdata = cgroup_storage_lookup(cgroup, map, true);
bpf_cgrp_storage_unlock();
cgroup_put(cgroup);
return sdata ? sdata->data : NULL;
}
static int bpf_cgrp_storage_update_elem(struct bpf_map *map, void *key,
void *value, u64 map_flags)
{
struct bpf_local_storage_data *sdata;
struct cgroup *cgroup;
int fd;
fd = *(int *)key;
cgroup = cgroup_get_from_fd(fd);
if (IS_ERR(cgroup))
return PTR_ERR(cgroup);
bpf_cgrp_storage_lock();
sdata = bpf_local_storage_update(cgroup, (struct bpf_local_storage_map *)map,
value, map_flags, GFP_ATOMIC);
bpf_cgrp_storage_unlock();
cgroup_put(cgroup);
return PTR_ERR_OR_ZERO(sdata);
}
static int cgroup_storage_delete(struct cgroup *cgroup, struct bpf_map *map)
{
struct bpf_local_storage_data *sdata;
sdata = cgroup_storage_lookup(cgroup, map, false);
if (!sdata)
return -ENOENT;
bpf_selem_unlink(SELEM(sdata), true);
return 0;
}
static int bpf_cgrp_storage_delete_elem(struct bpf_map *map, void *key)
{
struct cgroup *cgroup;
int err, fd;
fd = *(int *)key;
cgroup = cgroup_get_from_fd(fd);
if (IS_ERR(cgroup))
return PTR_ERR(cgroup);
bpf_cgrp_storage_lock();
err = cgroup_storage_delete(cgroup, map);
bpf_cgrp_storage_unlock();
cgroup_put(cgroup);
return err;
}
static int notsupp_get_next_key(struct bpf_map *map, void *key, void *next_key)
{
return -ENOTSUPP;
}
static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
{
return bpf_local_storage_map_alloc(attr, &cgroup_cache);
}
static void cgroup_storage_map_free(struct bpf_map *map)
{
bpf_local_storage_map_free(map, &cgroup_cache, NULL);
}
/* *gfp_flags* is a hidden argument provided by the verifier */
BPF_CALL_5(bpf_cgrp_storage_get, struct bpf_map *, map, struct cgroup *, cgroup,
void *, value, u64, flags, gfp_t, gfp_flags)
{
struct bpf_local_storage_data *sdata;
WARN_ON_ONCE(!bpf_rcu_lock_held());
if (flags & ~(BPF_LOCAL_STORAGE_GET_F_CREATE))
return (unsigned long)NULL;
if (!cgroup)
return (unsigned long)NULL;
if (!bpf_cgrp_storage_trylock())
return (unsigned long)NULL;
sdata = cgroup_storage_lookup(cgroup, map, true);
if (sdata)
goto unlock;
/* only allocate new storage, when the cgroup is refcounted */
if (!percpu_ref_is_dying(&cgroup->self.refcnt) &&
(flags & BPF_LOCAL_STORAGE_GET_F_CREATE))
sdata = bpf_local_storage_update(cgroup, (struct bpf_local_storage_map *)map,
value, BPF_NOEXIST, gfp_flags);
unlock:
bpf_cgrp_storage_unlock();
return IS_ERR_OR_NULL(sdata) ? (unsigned long)NULL : (unsigned long)sdata->data;
}
BPF_CALL_2(bpf_cgrp_storage_delete, struct bpf_map *, map, struct cgroup *, cgroup)
{
int ret;
WARN_ON_ONCE(!bpf_rcu_lock_held());
if (!cgroup)
return -EINVAL;
if (!bpf_cgrp_storage_trylock())
return -EBUSY;
ret = cgroup_storage_delete(cgroup, map);
bpf_cgrp_storage_unlock();
return ret;
}
const struct bpf_map_ops cgrp_storage_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = bpf_local_storage_map_alloc_check,
.map_alloc = cgroup_storage_map_alloc,
.map_free = cgroup_storage_map_free,
.map_get_next_key = notsupp_get_next_key,
.map_lookup_elem = bpf_cgrp_storage_lookup_elem,
.map_update_elem = bpf_cgrp_storage_update_elem,
.map_delete_elem = bpf_cgrp_storage_delete_elem,
.map_check_btf = bpf_local_storage_map_check_btf,
.map_btf_id = &bpf_local_storage_map_btf_id[0],
.map_owner_storage_ptr = cgroup_storage_ptr,
};
const struct bpf_func_proto bpf_cgrp_storage_get_proto = {
.func = bpf_cgrp_storage_get,
.gpl_only = false,
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_cgroup_btf_id[0],
.arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
.arg4_type = ARG_ANYTHING,
};
const struct bpf_func_proto bpf_cgrp_storage_delete_proto = {
.func = bpf_cgrp_storage_delete,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_cgroup_btf_id[0],
};