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bpf: pass bpf_struct_ops_link to callbacks in bpf_struct_ops.

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Pass an additional pointer of bpf_struct_ops_link to callback function reg,
unreg, and update provided by subsystems defined in bpf_struct_ops. A
bpf_struct_ops_map can be registered for multiple links. Passing a pointer
of bpf_struct_ops_link helps subsystems to distinguish them.

This pointer will be used in the later patches to let the subsystem
initiate a detachment on a link that was registered to it previously.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240530065946.979330-2-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee 2024-05-29 23:59:39 -07:00 committed by Martin KaFai Lau
parent 46253c4ae9
commit 73287fe228
6 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/bpf.h
View File

@ -1730,9 +1730,9 @@ struct bpf_struct_ops {
int (*init_member)(const struct btf_type *t,
const struct btf_member *member,
void *kdata, const void *udata);
int (*reg)(void *kdata);
void (*unreg)(void *kdata);
int (*update)(void *kdata, void *old_kdata);
int (*reg)(void *kdata, struct bpf_link *link);
void (*unreg)(void *kdata, struct bpf_link *link);
int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
int (*validate)(void *kdata);
void *cfi_stubs;
struct module *owner;

10
kernel/bpf/bpf_struct_ops.c
View File

@ -757,7 +757,7 @@ static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
goto unlock;
}
err = st_ops->reg(kdata);
err = st_ops->reg(kdata, NULL);
if (likely(!err)) {
/* This refcnt increment on the map here after
* 'st_ops->reg()' is secure since the state of the
@ -805,7 +805,7 @@ static long bpf_struct_ops_map_delete_elem(struct bpf_map *map, void *key)
BPF_STRUCT_OPS_STATE_TOBEFREE);
switch (prev_state) {
case BPF_STRUCT_OPS_STATE_INUSE:
st_map->st_ops_desc->st_ops->unreg(&st_map->kvalue.data);
st_map->st_ops_desc->st_ops->unreg(&st_map->kvalue.data, NULL);
bpf_map_put(map);
return 0;
case BPF_STRUCT_OPS_STATE_TOBEFREE:
@ -1060,7 +1060,7 @@ static void bpf_struct_ops_map_link_dealloc(struct bpf_link *link)
/* st_link->map can be NULL if
* bpf_struct_ops_link_create() fails to register.
*/
st_map->st_ops_desc->st_ops->unreg(&st_map->kvalue.data);
st_map->st_ops_desc->st_ops->unreg(&st_map->kvalue.data, link);
bpf_map_put(&st_map->map);
}
kfree(st_link);
@ -1125,7 +1125,7 @@ static int bpf_struct_ops_map_link_update(struct bpf_link *link, struct bpf_map
goto err_out;
}
err = st_map->st_ops_desc->st_ops->update(st_map->kvalue.data, old_st_map->kvalue.data);
err = st_map->st_ops_desc->st_ops->update(st_map->kvalue.data, old_st_map->kvalue.data, link);
if (err)
goto err_out;
@ -1176,7 +1176,7 @@ int bpf_struct_ops_link_create(union bpf_attr *attr)
if (err)
goto err_out;
err = st_map->st_ops_desc->st_ops->reg(st_map->kvalue.data);
err = st_map->st_ops_desc->st_ops->reg(st_map->kvalue.data, &link->link);
if (err) {
bpf_link_cleanup(&link_primer);
link = NULL;

4
net/bpf/bpf_dummy_struct_ops.c
View File

@ -272,12 +272,12 @@ static int bpf_dummy_init_member(const struct btf_type *t,
return -EOPNOTSUPP;
}
static int bpf_dummy_reg(void *kdata)
static int bpf_dummy_reg(void *kdata, struct bpf_link *link)
{
return -EOPNOTSUPP;
}
static void bpf_dummy_unreg(void *kdata)
static void bpf_dummy_unreg(void *kdata, struct bpf_link *link)
{
}

6
net/ipv4/bpf_tcp_ca.c
View File

@ -260,17 +260,17 @@ static int bpf_tcp_ca_check_member(const struct btf_type *t,
return 0;
}
static int bpf_tcp_ca_reg(void *kdata)
static int bpf_tcp_ca_reg(void *kdata, struct bpf_link *link)
{
return tcp_register_congestion_control(kdata);
}
static void bpf_tcp_ca_unreg(void *kdata)
static void bpf_tcp_ca_unreg(void *kdata, struct bpf_link *link)
{
tcp_unregister_congestion_control(kdata);
}
static int bpf_tcp_ca_update(void *kdata, void *old_kdata)
static int bpf_tcp_ca_update(void *kdata, void *old_kdata, struct bpf_link *link)
{
return tcp_update_congestion_control(kdata, old_kdata);
}

4
tools/testing/selftests/bpf/bpf_test_no_cfi/bpf_test_no_cfi.c
View File

@ -22,12 +22,12 @@ static int dummy_init_member(const struct btf_type *t,
return 0;
}
static int dummy_reg(void *kdata)
static int dummy_reg(void *kdata, struct bpf_link *link)
{
return 0;
}
static void dummy_unreg(void *kdata)
static void dummy_unreg(void *kdata, struct bpf_link *link)
{
}

6
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
View File

@ -820,7 +820,7 @@ static const struct bpf_verifier_ops bpf_testmod_verifier_ops = {
.is_valid_access = bpf_testmod_ops_is_valid_access,
};
static int bpf_dummy_reg(void *kdata)
static int bpf_dummy_reg(void *kdata, struct bpf_link *link)
{
struct bpf_testmod_ops *ops = kdata;
@ -835,7 +835,7 @@ static int bpf_dummy_reg(void *kdata)
return 0;
}
static void bpf_dummy_unreg(void *kdata)
static void bpf_dummy_unreg(void *kdata, struct bpf_link *link)
{
}
@ -871,7 +871,7 @@ struct bpf_struct_ops bpf_bpf_testmod_ops = {
.owner = THIS_MODULE,
};
static int bpf_dummy_reg2(void *kdata)
static int bpf_dummy_reg2(void *kdata, struct bpf_link *link)
{
struct bpf_testmod_ops2 *ops = kdata;