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bpf: Rename bpf_htab to bpf_shtab in sock_map
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There are two different `struct bpf_htab` in bpf code in the following
files:
- kernel/bpf/hashtab.c
- net/core/sock_map.c

It makes it impossible to find proper btf_id by name = "bpf_htab" and
kind = BTF_KIND_STRUCT what is needed to support access to map ptr so
that bpf program can access `struct bpf_htab` fields.

To make it possible one of the struct-s should be renamed, sock_map.c
looks like a better candidate for rename since it's specialized version
of hashtab.

Rename it to bpf_shtab ("sh" stands for Sock Hash).

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/c006a639e03c64ca50fc87c4bb627e0bfba90f4e.1592600985.git.rdna@fb.com
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Andrey Ignatov authored and Daniel Borkmann committed Jun 22, 2020
1 parent a2d0d62 commit 032a6b3
Showing 1 changed file with 41 additions and 41 deletions.
82 changes: 41 additions & 41 deletions net/core/sock_map.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -655,22 +655,22 @@ const struct bpf_map_ops sock_map_ops = {
.map_check_btf = map_check_no_btf,
};

struct bpf_htab_elem {
struct bpf_shtab_elem {
struct rcu_head rcu;
u32 hash;
struct sock *sk;
struct hlist_node node;
u8 key[];
};

struct bpf_htab_bucket {
struct bpf_shtab_bucket {
struct hlist_head head;
raw_spinlock_t lock;
};

struct bpf_htab {
struct bpf_shtab {
struct bpf_map map;
struct bpf_htab_bucket *buckets;
struct bpf_shtab_bucket *buckets;
u32 buckets_num;
u32 elem_size;
struct sk_psock_progs progs;
Expand All @@ -682,17 +682,17 @@ static inline u32 sock_hash_bucket_hash(const void *key, u32 len)
return jhash(key, len, 0);
}

static struct bpf_htab_bucket *sock_hash_select_bucket(struct bpf_htab *htab,
u32 hash)
static struct bpf_shtab_bucket *sock_hash_select_bucket(struct bpf_shtab *htab,
u32 hash)
{
return &htab->buckets[hash & (htab->buckets_num - 1)];
}

static struct bpf_htab_elem *
static struct bpf_shtab_elem *
sock_hash_lookup_elem_raw(struct hlist_head *head, u32 hash, void *key,
u32 key_size)
{
struct bpf_htab_elem *elem;
struct bpf_shtab_elem *elem;

hlist_for_each_entry_rcu(elem, head, node) {
if (elem->hash == hash &&
Expand All @@ -705,10 +705,10 @@ sock_hash_lookup_elem_raw(struct hlist_head *head, u32 hash, void *key,

static struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
u32 key_size = map->key_size, hash;
struct bpf_htab_bucket *bucket;
struct bpf_htab_elem *elem;
struct bpf_shtab_bucket *bucket;
struct bpf_shtab_elem *elem;

WARN_ON_ONCE(!rcu_read_lock_held());

Expand All @@ -719,8 +719,8 @@ static struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key)
return elem ? elem->sk : NULL;
}

static void sock_hash_free_elem(struct bpf_htab *htab,
struct bpf_htab_elem *elem)
static void sock_hash_free_elem(struct bpf_shtab *htab,
struct bpf_shtab_elem *elem)
{
atomic_dec(&htab->count);
kfree_rcu(elem, rcu);
Expand All @@ -729,9 +729,9 @@ static void sock_hash_free_elem(struct bpf_htab *htab,
static void sock_hash_delete_from_link(struct bpf_map *map, struct sock *sk,
void *link_raw)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_htab_elem *elem_probe, *elem = link_raw;
struct bpf_htab_bucket *bucket;
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
struct bpf_shtab_elem *elem_probe, *elem = link_raw;
struct bpf_shtab_bucket *bucket;

WARN_ON_ONCE(!rcu_read_lock_held());
bucket = sock_hash_select_bucket(htab, elem->hash);
Expand All @@ -753,10 +753,10 @@ static void sock_hash_delete_from_link(struct bpf_map *map, struct sock *sk,

static int sock_hash_delete_elem(struct bpf_map *map, void *key)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
u32 hash, key_size = map->key_size;
struct bpf_htab_bucket *bucket;
struct bpf_htab_elem *elem;
struct bpf_shtab_bucket *bucket;
struct bpf_shtab_elem *elem;
int ret = -ENOENT;

hash = sock_hash_bucket_hash(key, key_size);
Expand All @@ -774,12 +774,12 @@ static int sock_hash_delete_elem(struct bpf_map *map, void *key)
return ret;
}

static struct bpf_htab_elem *sock_hash_alloc_elem(struct bpf_htab *htab,
void *key, u32 key_size,
u32 hash, struct sock *sk,
struct bpf_htab_elem *old)
static struct bpf_shtab_elem *sock_hash_alloc_elem(struct bpf_shtab *htab,
void *key, u32 key_size,
u32 hash, struct sock *sk,
struct bpf_shtab_elem *old)
{
struct bpf_htab_elem *new;
struct bpf_shtab_elem *new;

if (atomic_inc_return(&htab->count) > htab->map.max_entries) {
if (!old) {
Expand All @@ -803,10 +803,10 @@ static struct bpf_htab_elem *sock_hash_alloc_elem(struct bpf_htab *htab,
static int sock_hash_update_common(struct bpf_map *map, void *key,
struct sock *sk, u64 flags)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
u32 key_size = map->key_size, hash;
struct bpf_htab_elem *elem, *elem_new;
struct bpf_htab_bucket *bucket;
struct bpf_shtab_elem *elem, *elem_new;
struct bpf_shtab_bucket *bucket;
struct sk_psock_link *link;
struct sk_psock *psock;
int ret;
Expand Down Expand Up @@ -916,8 +916,8 @@ static int sock_hash_update_elem(struct bpf_map *map, void *key,
static int sock_hash_get_next_key(struct bpf_map *map, void *key,
void *key_next)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_htab_elem *elem, *elem_next;
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
struct bpf_shtab_elem *elem, *elem_next;
u32 hash, key_size = map->key_size;
struct hlist_head *head;
int i = 0;
Expand All @@ -931,7 +931,7 @@ static int sock_hash_get_next_key(struct bpf_map *map, void *key,
goto find_first_elem;

elem_next = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(&elem->node)),
struct bpf_htab_elem, node);
struct bpf_shtab_elem, node);
if (elem_next) {
memcpy(key_next, elem_next->key, key_size);
return 0;
Expand All @@ -943,7 +943,7 @@ static int sock_hash_get_next_key(struct bpf_map *map, void *key,
for (; i < htab->buckets_num; i++) {
head = &sock_hash_select_bucket(htab, i)->head;
elem_next = hlist_entry_safe(rcu_dereference_raw(hlist_first_rcu(head)),
struct bpf_htab_elem, node);
struct bpf_shtab_elem, node);
if (elem_next) {
memcpy(key_next, elem_next->key, key_size);
return 0;
Expand All @@ -955,7 +955,7 @@ static int sock_hash_get_next_key(struct bpf_map *map, void *key,

static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
{
struct bpf_htab *htab;
struct bpf_shtab *htab;
int i, err;
u64 cost;

Expand All @@ -977,15 +977,15 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
bpf_map_init_from_attr(&htab->map, attr);

htab->buckets_num = roundup_pow_of_two(htab->map.max_entries);
htab->elem_size = sizeof(struct bpf_htab_elem) +
htab->elem_size = sizeof(struct bpf_shtab_elem) +
round_up(htab->map.key_size, 8);
if (htab->buckets_num == 0 ||
htab->buckets_num > U32_MAX / sizeof(struct bpf_htab_bucket)) {
htab->buckets_num > U32_MAX / sizeof(struct bpf_shtab_bucket)) {
err = -EINVAL;
goto free_htab;
}

cost = (u64) htab->buckets_num * sizeof(struct bpf_htab_bucket) +
cost = (u64) htab->buckets_num * sizeof(struct bpf_shtab_bucket) +
(u64) htab->elem_size * htab->map.max_entries;
if (cost >= U32_MAX - PAGE_SIZE) {
err = -EINVAL;
Expand All @@ -996,7 +996,7 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
goto free_htab;

htab->buckets = bpf_map_area_alloc(htab->buckets_num *
sizeof(struct bpf_htab_bucket),
sizeof(struct bpf_shtab_bucket),
htab->map.numa_node);
if (!htab->buckets) {
bpf_map_charge_finish(&htab->map.memory);
Expand All @@ -1017,10 +1017,10 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)

static void sock_hash_free(struct bpf_map *map)
{
struct bpf_htab *htab = container_of(map, struct bpf_htab, map);
struct bpf_htab_bucket *bucket;
struct bpf_shtab *htab = container_of(map, struct bpf_shtab, map);
struct bpf_shtab_bucket *bucket;
struct hlist_head unlink_list;
struct bpf_htab_elem *elem;
struct bpf_shtab_elem *elem;
struct hlist_node *node;
int i;

Expand Down Expand Up @@ -1096,7 +1096,7 @@ static void *sock_hash_lookup(struct bpf_map *map, void *key)

static void sock_hash_release_progs(struct bpf_map *map)
{
psock_progs_drop(&container_of(map, struct bpf_htab, map)->progs);
psock_progs_drop(&container_of(map, struct bpf_shtab, map)->progs);
}

BPF_CALL_4(bpf_sock_hash_update, struct bpf_sock_ops_kern *, sops,
Expand Down Expand Up @@ -1194,7 +1194,7 @@ static struct sk_psock_progs *sock_map_progs(struct bpf_map *map)
case BPF_MAP_TYPE_SOCKMAP:
return &container_of(map, struct bpf_stab, map)->progs;
case BPF_MAP_TYPE_SOCKHASH:
return &container_of(map, struct bpf_htab, map)->progs;
return &container_of(map, struct bpf_shtab, map)->progs;
default:
break;
}
Expand Down

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