From: Lorenz Bauer <lmb@cloudflare.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: kernel-team@cloudflare.com, Lorenz Bauer <lmb@cloudflare.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/5] bpf: convert queue and stack map to map_copy_value
Date: Tue, 10 Mar 2020 17:47:08 +0000 [thread overview]
Message-ID: <20200310174711.7490-3-lmb@cloudflare.com> (raw)
In-Reply-To: <20200310174711.7490-1-lmb@cloudflare.com>
Migrate BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK to map_copy_value,
by introducing small wrappers that discard the (unused) key argument.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
kernel/bpf/queue_stack_maps.c | 18 ++++++++++++++++++
kernel/bpf/syscall.c | 5 +----
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/kernel/bpf/queue_stack_maps.c b/kernel/bpf/queue_stack_maps.c
index f697647ceb54..5c89b7583cd2 100644
--- a/kernel/bpf/queue_stack_maps.c
+++ b/kernel/bpf/queue_stack_maps.c
@@ -262,11 +262,28 @@ static int queue_stack_map_get_next_key(struct bpf_map *map, void *key,
return -EINVAL;
}
+/* Called from syscall */
+static int queue_map_copy_value(struct bpf_map *map, void *key, void *value)
+{
+ (void)key;
+
+ return queue_map_peek_elem(map, value);
+}
+
+/* Called from syscall */
+static int stack_map_copy_value(struct bpf_map *map, void *key, void *value)
+{
+ (void)key;
+
+ return stack_map_peek_elem(map, value);
+}
+
const struct bpf_map_ops queue_map_ops = {
.map_alloc_check = queue_stack_map_alloc_check,
.map_alloc = queue_stack_map_alloc,
.map_free = queue_stack_map_free,
.map_lookup_elem = queue_stack_map_lookup_elem,
+ .map_copy_value = queue_map_copy_value,
.map_update_elem = queue_stack_map_update_elem,
.map_delete_elem = queue_stack_map_delete_elem,
.map_push_elem = queue_stack_map_push_elem,
@@ -280,6 +297,7 @@ const struct bpf_map_ops stack_map_ops = {
.map_alloc = queue_stack_map_alloc,
.map_free = queue_stack_map_free,
.map_lookup_elem = queue_stack_map_lookup_elem,
+ .map_copy_value = stack_map_copy_value,
.map_update_elem = queue_stack_map_update_elem,
.map_delete_elem = queue_stack_map_delete_elem,
.map_push_elem = queue_stack_map_push_elem,
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 6503824e81e9..20c6cdace275 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -218,10 +218,7 @@ static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
return bpf_map_offload_lookup_elem(map, key, value);
bpf_disable_instrumentation();
- if (map->map_type == BPF_MAP_TYPE_QUEUE ||
- map->map_type == BPF_MAP_TYPE_STACK) {
- err = map->ops->map_peek_elem(map, value);
- } else if (map->ops->map_copy_value) {
+ if (map->ops->map_copy_value) {
err = map->ops->map_copy_value(map, key, value);
} else {
rcu_read_lock();
--
2.20.1
next prev parent reply other threads:[~2020-03-10 17:47 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 17:47 [PATCH 0/5] Return fds from privileged sockhash/sockmap lookup Lorenz Bauer
2020-03-10 17:47 ` [PATCH 1/5] bpf: add map_copy_value hook Lorenz Bauer
2020-03-10 17:47 ` Lorenz Bauer [this message]
2020-03-11 14:00 ` [PATCH 2/5] bpf: convert queue and stack map to map_copy_value Jakub Sitnicki
2020-03-11 22:31 ` John Fastabend
2020-03-10 17:47 ` [PATCH 3/5] bpf: convert sock map and hash " Lorenz Bauer
2020-03-11 13:55 ` Jakub Sitnicki
2020-03-10 17:47 ` [PATCH 4/5] bpf: sockmap, sockhash: return file descriptors from privileged lookup Lorenz Bauer
2020-03-11 23:27 ` John Fastabend
2020-03-17 10:17 ` Lorenz Bauer
2020-03-17 15:18 ` Jakub Sitnicki
2020-03-17 18:16 ` John Fastabend
2020-03-10 17:47 ` [PATCH 5/5] bpf: sockmap, sockhash: test looking up fds Lorenz Bauer
2020-03-11 13:52 ` Jakub Sitnicki
2020-03-11 17:24 ` Lorenz Bauer
2020-03-11 13:44 ` [PATCH 0/5] Return fds from privileged sockhash/sockmap lookup Jakub Sitnicki
2020-03-11 22:40 ` John Fastabend
2020-03-12 1:58 ` Alexei Starovoitov
2020-03-12 9:16 ` Lorenz Bauer
2020-03-12 17:58 ` Alexei Starovoitov
2020-03-12 19:32 ` John Fastabend
2020-03-13 11:03 ` Lorenz Bauer
2020-03-13 10:48 ` Lorenz Bauer
2020-03-14 2:58 ` Alexei Starovoitov
2020-03-17 9:55 ` Lorenz Bauer
2020-03-17 19:05 ` John Fastabend
2020-03-20 15:12 ` Lorenz Bauer
2020-04-07 3:08 ` Alexei Starovoitov
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