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bpf: allow struct bpf_wq to be embedded in arraymaps and hashmaps

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Currently bpf_wq_cancel_and_free() is just a placeholder as there is
no memory allocation for bpf_wq just yet.

Again, duplication of the bpf_timer approach

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Link: https://lore.kernel.org/r/20240420-bpf_wq-v2-9-6c986a5a741f@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Benjamin Tissoires
2024-04-20 11:09:09 +02:00
committed by Alexei Starovoitov
parent d940c9b94d
commit 246331e3f1
5 changed files with 73 additions and 19 deletions
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kernel/bpf/arraymap.c
+11 -7
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@@ -428,17 +428,21 @@ 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(struct bpf_map *map)
static void array_map_free_timers_wq(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 on uref dropping to zero. */
if (!btf_record_has_field(map->record, BPF_TIMER))
return;
/* 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))
for (i = 0; i < array->map.max_entries; i++)
bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
for (i = 0; i < array->map.max_entries; i++)
bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
if (btf_record_has_field(map->record, BPF_WORKQUEUE))
for (i = 0; i < array->map.max_entries; i++)
bpf_obj_free_workqueue(map->record, array_map_elem_ptr(array, i));
}
/* Called when map->refcnt goes to zero, either from workqueue or from syscall */
@@ -782,7 +786,7 @@ 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,
.map_release_uref = array_map_free_timers_wq,
.map_lookup_elem = array_map_lookup_elem,
.map_update_elem = array_map_update_elem,
.map_delete_elem = array_map_delete_elem,