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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


  parent reply	other threads:[~2020-03-10 17:47 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200310174711.7490-1-lmb@cloudflare.com>
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

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