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BPF task work WIP #9311

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11 changes: 11 additions & 0 deletions include/linux/bpf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,7 @@ enum btf_field_type {
BPF_WORKQUEUE = (1 << 10),
BPF_UPTR = (1 << 11),
BPF_RES_SPIN_LOCK = (1 << 12),
BPF_TASK_WORK = (1 << 13),
};

typedef void (*btf_dtor_kfunc_t)(void *);
Expand Down Expand Up @@ -245,6 +246,7 @@ struct btf_record {
int timer_off;
int wq_off;
int refcount_off;
int task_work_off;
struct btf_field fields[];
};

Expand Down Expand Up @@ -340,6 +342,8 @@ static inline const char *btf_field_type_name(enum btf_field_type type)
return "bpf_rb_node";
case BPF_REFCOUNT:
return "bpf_refcount";
case BPF_TASK_WORK:
return "bpf_task_work";
default:
WARN_ON_ONCE(1);
return "unknown";
Expand Down Expand Up @@ -378,6 +382,8 @@ static inline u32 btf_field_type_size(enum btf_field_type type)
return sizeof(struct bpf_rb_node);
case BPF_REFCOUNT:
return sizeof(struct bpf_refcount);
case BPF_TASK_WORK:
return sizeof(struct bpf_task_work);
default:
WARN_ON_ONCE(1);
return 0;
Expand Down Expand Up @@ -410,6 +416,8 @@ static inline u32 btf_field_type_align(enum btf_field_type type)
return __alignof__(struct bpf_rb_node);
case BPF_REFCOUNT:
return __alignof__(struct bpf_refcount);
case BPF_TASK_WORK:
return __alignof__(struct bpf_task_work);
default:
WARN_ON_ONCE(1);
return 0;
Expand Down Expand Up @@ -441,6 +449,7 @@ static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
case BPF_KPTR_REF:
case BPF_KPTR_PERCPU:
case BPF_UPTR:
case BPF_TASK_WORK:
break;
default:
WARN_ON_ONCE(1);
Expand Down Expand Up @@ -577,6 +586,7 @@ void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
bool lock_src);
void bpf_timer_cancel_and_free(void *timer);
void bpf_wq_cancel_and_free(void *timer);
void bpf_task_work_cancel_and_free(void *timer);
void bpf_list_head_free(const struct btf_field *field, void *list_head,
struct bpf_spin_lock *spin_lock);
void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
Expand Down Expand Up @@ -2390,6 +2400,7 @@ struct btf_record *btf_record_dup(const struct btf_record *rec);
bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
void bpf_obj_free_task_work(const struct btf_record *rec, void *obj);
void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);

Expand Down
4 changes: 4 additions & 0 deletions include/uapi/linux/bpf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -7410,6 +7410,10 @@ struct bpf_timer {
__u64 __opaque[2];
} __attribute__((aligned(8)));

struct bpf_task_work {
__u64 __opaque[8];
} __attribute__((aligned(8)));

struct bpf_wq {
__u64 __opaque[2];
} __attribute__((aligned(8)));
Expand Down
8 changes: 5 additions & 3 deletions kernel/bpf/arraymap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -431,20 +431,22 @@ static void *array_map_vmalloc_addr(struct bpf_array *array)
return (void *)round_down((unsigned long)array, PAGE_SIZE);
}

static void array_map_free_timers_wq(struct bpf_map *map)
static void array_map_free_internal_structs(struct bpf_map *map)
{
struct bpf_array *array = container_of(map, struct bpf_array, map);
int i;

/* We don't reset or free fields other than timer and workqueue
* on uref dropping to zero.
*/
if (btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE)) {
if (btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE | BPF_TASK_WORK)) {
for (i = 0; i < array->map.max_entries; i++) {
if (btf_record_has_field(map->record, BPF_TIMER))
bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
if (btf_record_has_field(map->record, BPF_WORKQUEUE))
bpf_obj_free_workqueue(map->record, array_map_elem_ptr(array, i));
if (btf_record_has_field(map->record, BPF_TASK_WORK))
bpf_obj_free_task_work(map->record, array_map_elem_ptr(array, i));
}
}
}
Expand Down Expand Up @@ -783,7 +785,7 @@ const struct bpf_map_ops array_map_ops = {
.map_alloc = array_map_alloc,
.map_free = array_map_free,
.map_get_next_key = array_map_get_next_key,
.map_release_uref = array_map_free_timers_wq,
.map_release_uref = array_map_free_internal_structs,
.map_lookup_elem = array_map_lookup_elem,
.map_update_elem = array_map_update_elem,
.map_delete_elem = array_map_delete_elem,
Expand Down
15 changes: 15 additions & 0 deletions kernel/bpf/btf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3527,6 +3527,15 @@ static int btf_get_field_type(const struct btf *btf, const struct btf_type *var_
goto end;
}
}
if (field_mask & BPF_TASK_WORK) {
if (!strcmp(name, "bpf_task_work")) {
if (*seen_mask & BPF_TASK_WORK)
return -E2BIG;
*seen_mask |= BPF_TASK_WORK;
type = BPF_TASK_WORK;
goto end;
}
}
field_mask_test_name(BPF_LIST_HEAD, "bpf_list_head");
field_mask_test_name(BPF_LIST_NODE, "bpf_list_node");
field_mask_test_name(BPF_RB_ROOT, "bpf_rb_root");
Expand Down Expand Up @@ -3693,6 +3702,7 @@ static int btf_find_field_one(const struct btf *btf,
case BPF_LIST_NODE:
case BPF_RB_NODE:
case BPF_REFCOUNT:
case BPF_TASK_WORK:
ret = btf_find_struct(btf, var_type, off, sz, field_type,
info_cnt ? &info[0] : &tmp);
if (ret < 0)
Expand Down Expand Up @@ -3985,6 +3995,7 @@ struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
rec->timer_off = -EINVAL;
rec->wq_off = -EINVAL;
rec->refcount_off = -EINVAL;
rec->task_work_off = -EINVAL;
for (i = 0; i < cnt; i++) {
field_type_size = btf_field_type_size(info_arr[i].type);
if (info_arr[i].off + field_type_size > value_size) {
Expand Down Expand Up @@ -4050,6 +4061,10 @@ struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
case BPF_LIST_NODE:
case BPF_RB_NODE:
break;
case BPF_TASK_WORK:
WARN_ON_ONCE(rec->task_work_off >= 0);
rec->task_work_off = rec->fields[i].offset;
break;
default:
ret = -EFAULT;
goto end;
Expand Down
22 changes: 14 additions & 8 deletions kernel/bpf/hashtab.c
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Original file line number Diff line number Diff line change
Expand Up @@ -215,7 +215,7 @@ static bool htab_has_extra_elems(struct bpf_htab *htab)
return !htab_is_percpu(htab) && !htab_is_lru(htab) && !is_fd_htab(htab);
}

static void htab_free_prealloced_timers_and_wq(struct bpf_htab *htab)
static void htab_free_prealloced_internal_structs(struct bpf_htab *htab)
{
u32 num_entries = htab->map.max_entries;
int i;
Expand All @@ -233,6 +233,9 @@ static void htab_free_prealloced_timers_and_wq(struct bpf_htab *htab)
if (btf_record_has_field(htab->map.record, BPF_WORKQUEUE))
bpf_obj_free_workqueue(htab->map.record,
htab_elem_value(elem, htab->map.key_size));
if (btf_record_has_field(htab->map.record, BPF_TASK_WORK))
bpf_obj_free_task_work(htab->map.record,
htab_elem_value(elem, htab->map.key_size));
cond_resched();
}
}
Expand Down Expand Up @@ -1490,7 +1493,7 @@ static void delete_all_elements(struct bpf_htab *htab)
}
}

static void htab_free_malloced_timers_and_wq(struct bpf_htab *htab)
static void htab_free_malloced_internal_structs(struct bpf_htab *htab)
{
int i;

Expand All @@ -1508,22 +1511,25 @@ static void htab_free_malloced_timers_and_wq(struct bpf_htab *htab)
if (btf_record_has_field(htab->map.record, BPF_WORKQUEUE))
bpf_obj_free_workqueue(htab->map.record,
htab_elem_value(l, htab->map.key_size));
if (btf_record_has_field(htab->map.record, BPF_TASK_WORK))
bpf_obj_free_task_work(htab->map.record,
htab_elem_value(l, htab->map.key_size));
}
cond_resched_rcu();
}
rcu_read_unlock();
}

static void htab_map_free_timers_and_wq(struct bpf_map *map)
static void htab_map_free_internal_structs(struct bpf_map *map)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);

/* We only free timer and workqueue on uref dropping to zero */
if (btf_record_has_field(htab->map.record, BPF_TIMER | BPF_WORKQUEUE)) {
if (btf_record_has_field(htab->map.record, BPF_TIMER | BPF_WORKQUEUE | BPF_TASK_WORK)) {
if (!htab_is_prealloc(htab))
htab_free_malloced_timers_and_wq(htab);
htab_free_malloced_internal_structs(htab);
else
htab_free_prealloced_timers_and_wq(htab);
htab_free_prealloced_internal_structs(htab);
}
}

Expand Down Expand Up @@ -2255,7 +2261,7 @@ const struct bpf_map_ops htab_map_ops = {
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
.map_get_next_key = htab_map_get_next_key,
.map_release_uref = htab_map_free_timers_and_wq,
.map_release_uref = htab_map_free_internal_structs,
.map_lookup_elem = htab_map_lookup_elem,
.map_lookup_and_delete_elem = htab_map_lookup_and_delete_elem,
.map_update_elem = htab_map_update_elem,
Expand All @@ -2276,7 +2282,7 @@ const struct bpf_map_ops htab_lru_map_ops = {
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
.map_get_next_key = htab_map_get_next_key,
.map_release_uref = htab_map_free_timers_and_wq,
.map_release_uref = htab_map_free_internal_structs,
.map_lookup_elem = htab_lru_map_lookup_elem,
.map_lookup_and_delete_elem = htab_lru_map_lookup_and_delete_elem,
.map_lookup_elem_sys_only = htab_lru_map_lookup_elem_sys,
Expand Down
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