diff options
| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2021-06-24 18:05:54 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2021-06-24 19:41:15 +0200 |
| commit | 694cea395fded425008e93cd90cfdf7a451674af (patch) | |
| tree | be068946c3b7fd801c7d8854947c4d090de9896b /kernel/bpf/lpm_trie.c | |
| parent | e74c74f9e51deb725e72d129084ba8252d47222d (diff) | |
bpf: Allow RCU-protected lookups to happen from bh context
XDP programs are called from a NAPI poll context, which means the RCU
reference liveness is ensured by local_bh_disable(). Add
rcu_read_lock_bh_held() as a condition to the RCU checks for map lookups so
lockdep understands that the dereferences are safe from inside *either* an
rcu_read_lock() section *or* a local_bh_disable() section. While both
bh_disabled and rcu_read_lock() provide RCU protection, they are
semantically distinct, so we need both conditions to prevent lockdep
complaints.
This change is done in preparation for removing the redundant
rcu_read_lock()s from drivers.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210624160609.292325-5-toke@redhat.com
Diffstat (limited to 'kernel/bpf/lpm_trie.c')
| -rw-r--r-- | kernel/bpf/lpm_trie.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c index 1b7b8a6f34ee..423549d2c52e 100644 --- a/kernel/bpf/lpm_trie.c +++ b/kernel/bpf/lpm_trie.c @@ -232,7 +232,8 @@ static void *trie_lookup_elem(struct bpf_map *map, void *_key) /* Start walking the trie from the root node ... */ - for (node = rcu_dereference(trie->root); node;) { + for (node = rcu_dereference_check(trie->root, rcu_read_lock_bh_held()); + node;) { unsigned int next_bit; size_t matchlen; @@ -264,7 +265,8 @@ static void *trie_lookup_elem(struct bpf_map *map, void *_key) * traverse down. */ next_bit = extract_bit(key->data, node->prefixlen); - node = rcu_dereference(node->child[next_bit]); + node = rcu_dereference_check(node->child[next_bit], + rcu_read_lock_bh_held()); } if (!found) |