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bpf: Add bpf_selem_free() 

This patch refactors the selem freeing logic into bpf_selem_free().
It is a preparation work for a later patch using
bpf_mem_cache_alloc/free. The other kfree(selem) cases
are also changed to bpf_selem_free(..., reuse_now = true).

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20230308065936.1550103-10-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2023-03-07 22:59:28 -08:00 committed by Alexei Starovoitov
parent f8ccf30c17
commit c0d63f3091
3 changed files with 19 additions and 8 deletions
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4
include/linux/bpf_local_storage.h
View File

@ -152,6 +152,10 @@ struct bpf_local_storage_elem *
bpf_selem_alloc(struct bpf_local_storage_map *smap, void *owner, void *value,
bool charge_mem, gfp_t gfp_flags);
void bpf_selem_free(struct bpf_local_storage_elem *selem,
struct bpf_local_storage_map *smap,
bool reuse_now);
int
bpf_local_storage_alloc(void *owner,
struct bpf_local_storage_map *smap,

21
kernel/bpf/bpf_local_storage.c
View File

@ -125,6 +125,17 @@ static void bpf_selem_free_trace_rcu(struct rcu_head *rcu)
call_rcu(rcu, bpf_selem_free_rcu);
}
void bpf_selem_free(struct bpf_local_storage_elem *selem,
struct bpf_local_storage_map *smap,
bool reuse_now)
{
bpf_obj_free_fields(smap->map.record, SDATA(selem)->data);
if (!reuse_now)
call_rcu_tasks_trace(&selem->rcu, bpf_selem_free_trace_rcu);
else
call_rcu(&selem->rcu, bpf_selem_free_rcu);
}
/* local_storage->lock must be held and selem->local_storage == local_storage.
* The caller must ensure selem->smap is still valid to be
* dereferenced for its smap->elem_size and smap->cache_idx.
@ -175,11 +186,7 @@ static bool bpf_selem_unlink_storage_nolock(struct bpf_local_storage *local_stor
SDATA(selem))
RCU_INIT_POINTER(local_storage->cache[smap->cache_idx], NULL);
bpf_obj_free_fields(smap->map.record, SDATA(selem)->data);
if (!reuse_now)
call_rcu_tasks_trace(&selem->rcu, bpf_selem_free_trace_rcu);
else
call_rcu(&selem->rcu, bpf_selem_free_rcu);
bpf_selem_free(selem, smap, reuse_now);
if (rcu_access_pointer(local_storage->smap) == smap)
RCU_INIT_POINTER(local_storage->smap, NULL);
@ -423,7 +430,7 @@ bpf_local_storage_update(void *owner, struct bpf_local_storage_map *smap,
err = bpf_local_storage_alloc(owner, smap, selem, gfp_flags);
if (err) {
kfree(selem);
bpf_selem_free(selem, smap, true);
mem_uncharge(smap, owner, smap->elem_size);
return ERR_PTR(err);
}
@ -517,7 +524,7 @@ unlock_err:
raw_spin_unlock_irqrestore(&local_storage->lock, flags);
if (selem) {
mem_uncharge(smap, owner, smap->elem_size);
kfree(selem);
bpf_selem_free(selem, smap, true);
}
return ERR_PTR(err);
}

2
net/core/bpf_sk_storage.c
View File

@ -197,7 +197,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
} else {
ret = bpf_local_storage_alloc(newsk, smap, copy_selem, GFP_ATOMIC);
if (ret) {
kfree(copy_selem);
bpf_selem_free(copy_selem, smap, true);
atomic_sub(smap->elem_size,
&newsk->sk_omem_alloc);
bpf_map_put(map);