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bpf: Support kptrs in percpu hashmap and percpu LRU hashmap 

Enable support for kptrs in percpu BPF hashmap and percpu BPF LRU
hashmap by wiring up the freeing of these kptrs from percpu map
elements.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20230225154010.391965-2-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2023-02-25 16:40:08 +01:00 committed by Alexei Starovoitov
parent c4b5c5bad9
commit 65334e64a4
2 changed files with 39 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
kernel/bpf/hashtab.c
View File

@ -249,7 +249,18 @@ static void htab_free_prealloced_fields(struct bpf_htab *htab)
struct htab_elem *elem;
elem = get_htab_elem(htab, i);
bpf_obj_free_fields(htab->map.record, elem->key + round_up(htab->map.key_size, 8));
if (htab_is_percpu(htab)) {
void __percpu *pptr = htab_elem_get_ptr(elem, htab->map.key_size);
int cpu;
for_each_possible_cpu(cpu) {
bpf_obj_free_fields(htab->map.record, per_cpu_ptr(pptr, cpu));
cond_resched();
}
} else {
bpf_obj_free_fields(htab->map.record, elem->key + round_up(htab->map.key_size, 8));
cond_resched();
}
cond_resched();
}
}
@ -759,9 +770,17 @@ static int htab_lru_map_gen_lookup(struct bpf_map *map,
static void check_and_free_fields(struct bpf_htab *htab,
struct htab_elem *elem)
{
void *map_value = elem->key + round_up(htab->map.key_size, 8);
if (htab_is_percpu(htab)) {
void __percpu *pptr = htab_elem_get_ptr(elem, htab->map.key_size);
int cpu;
bpf_obj_free_fields(htab->map.record, map_value);
for_each_possible_cpu(cpu)
bpf_obj_free_fields(htab->map.record, per_cpu_ptr(pptr, cpu));
} else {
void *map_value = elem->key + round_up(htab->map.key_size, 8);
bpf_obj_free_fields(htab->map.record, map_value);
}
}
/* It is called from the bpf_lru_list when the LRU needs to delete
@ -858,9 +877,9 @@ find_first_elem:
static void htab_elem_free(struct bpf_htab *htab, struct htab_elem *l)
{
check_and_free_fields(htab, l);
if (htab->map.map_type == BPF_MAP_TYPE_PERCPU_HASH)
bpf_mem_cache_free(&htab->pcpu_ma, l->ptr_to_pptr);
check_and_free_fields(htab, l);
bpf_mem_cache_free(&htab->ma, l);
}
@ -918,14 +937,13 @@ static void pcpu_copy_value(struct bpf_htab *htab, void __percpu *pptr,
{
if (!onallcpus) {
/* copy true value_size bytes */
memcpy(this_cpu_ptr(pptr), value, htab->map.value_size);
copy_map_value(&htab->map, this_cpu_ptr(pptr), value);
} else {
u32 size = round_up(htab->map.value_size, 8);
int off = 0, cpu;
for_each_possible_cpu(cpu) {
bpf_long_memcpy(per_cpu_ptr(pptr, cpu),
value + off, size);
copy_map_value_long(&htab->map, per_cpu_ptr(pptr, cpu), value + off);
off += size;
}
}
@ -940,16 +958,14 @@ static void pcpu_init_value(struct bpf_htab *htab, void __percpu *pptr,
* (onallcpus=false always when coming from bpf prog).
*/
if (!onallcpus) {
u32 size = round_up(htab->map.value_size, 8);
int current_cpu = raw_smp_processor_id();
int cpu;
for_each_possible_cpu(cpu) {
if (cpu == current_cpu)
bpf_long_memcpy(per_cpu_ptr(pptr, cpu), value,
size);
else
memset(per_cpu_ptr(pptr, cpu), 0, size);
copy_map_value_long(&htab->map, per_cpu_ptr(pptr, cpu), value);
else /* Since elem is preallocated, we cannot touch special fields */
zero_map_value(&htab->map, per_cpu_ptr(pptr, cpu));
}
} else {
pcpu_copy_value(htab, pptr, value, onallcpus);
@ -1575,9 +1591,8 @@ static int __htab_map_lookup_and_delete_elem(struct bpf_map *map, void *key,
pptr = htab_elem_get_ptr(l, key_size);
for_each_possible_cpu(cpu) {
bpf_long_memcpy(value + off,
per_cpu_ptr(pptr, cpu),
roundup_value_size);
copy_map_value_long(&htab->map, value + off, per_cpu_ptr(pptr, cpu));
check_and_init_map_value(&htab->map, value + off);
off += roundup_value_size;
}
} else {
@ -1772,8 +1787,8 @@ again_nocopy:
pptr = htab_elem_get_ptr(l, map->key_size);
for_each_possible_cpu(cpu) {
bpf_long_memcpy(dst_val + off,
per_cpu_ptr(pptr, cpu), size);
copy_map_value_long(&htab->map, dst_val + off, per_cpu_ptr(pptr, cpu));
check_and_init_map_value(&htab->map, dst_val + off);
off += size;
}
} else {
@ -2046,9 +2061,9 @@ static int __bpf_hash_map_seq_show(struct seq_file *seq, struct htab_elem *elem)
roundup_value_size = round_up(map->value_size, 8);
pptr = htab_elem_get_ptr(elem, map->key_size);
for_each_possible_cpu(cpu) {
bpf_long_memcpy(info->percpu_value_buf + off,
per_cpu_ptr(pptr, cpu),
roundup_value_size);
copy_map_value_long(map, info->percpu_value_buf + off,
per_cpu_ptr(pptr, cpu));
check_and_init_map_value(map, info->percpu_value_buf + off);
off += roundup_value_size;
}
ctx.value = info->percpu_value_buf;
@ -2292,8 +2307,8 @@ int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value)
*/
pptr = htab_elem_get_ptr(l, map->key_size);
for_each_possible_cpu(cpu) {
bpf_long_memcpy(value + off,
per_cpu_ptr(pptr, cpu), size);
copy_map_value_long(map, value + off, per_cpu_ptr(pptr, cpu));
check_and_init_map_value(map, value + off);
off += size;
}
ret = 0;

2
kernel/bpf/syscall.c
View File

@ -1059,7 +1059,9 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf,
case BPF_KPTR_UNREF:
case BPF_KPTR_REF:
if (map->map_type != BPF_MAP_TYPE_HASH &&
map->map_type != BPF_MAP_TYPE_PERCPU_HASH &&
map->map_type != BPF_MAP_TYPE_LRU_HASH &&
map->map_type != BPF_MAP_TYPE_LRU_PERCPU_HASH &&
map->map_type != BPF_MAP_TYPE_ARRAY &&
map->map_type != BPF_MAP_TYPE_PERCPU_ARRAY) {
ret = -EOPNOTSUPP;