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[v2,bpf-next,02/13] bpf: Define migration types for SO_REUSEPORT.

Message ID 20201207132456.65472-3-kuniyu@amazon.co.jp (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Socket migration for SO_REUSEPORT. | expand

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Commit Message

Iwashima, Kuniyuki Dec. 7, 2020, 1:24 p.m. UTC 
As noted in the preceding commit, there are two migration types. In
addition to that, the kernel will run the same eBPF program to select a
listener for SYN packets.

This patch defines three types to signal the kernel and the eBPF program if
it is receiving a new request or migrating ESTABLISHED/SYN_RECV sockets in
the accept queue or NEW_SYN_RECV socket during 3WHS.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
---
 include/uapi/linux/bpf.h       | 14 ++++++++++++++
 tools/include/uapi/linux/bpf.h | 14 ++++++++++++++
 2 files changed, 28 insertions(+)
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Patch

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 1233f14f659f..7a48e0055500 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -4423,6 +4423,20 @@  struct sk_msg_md {
 	__bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
 };
 
+/* Migration type for SO_REUSEPORT enabled TCP sockets.
+ *
+ * BPF_SK_REUSEPORT_MIGRATE_NO      : Select a listener for SYN packets.
+ * BPF_SK_REUSEPORT_MIGRATE_QUEUE   : Migrate ESTABLISHED and SYN_RECV sockets in
+ *                                    the accept queue at close() or shutdown().
+ * BPF_SK_REUSEPORT_MIGRATE_REQUEST : Migrate NEW_SYN_RECV socket at receiving the
+ *                                    final ACK of 3WHS or retransmitting SYN+ACKs.
+ */
+enum {
+	BPF_SK_REUSEPORT_MIGRATE_NO,
+	BPF_SK_REUSEPORT_MIGRATE_QUEUE,
+	BPF_SK_REUSEPORT_MIGRATE_REQUEST,
+};
+
 struct sk_reuseport_md {
 	/*
 	 * Start of directly accessible data. It begins from
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 1233f14f659f..7a48e0055500 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4423,6 +4423,20 @@  struct sk_msg_md {
 	__bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
 };
 
+/* Migration type for SO_REUSEPORT enabled TCP sockets.
+ *
+ * BPF_SK_REUSEPORT_MIGRATE_NO      : Select a listener for SYN packets.
+ * BPF_SK_REUSEPORT_MIGRATE_QUEUE   : Migrate ESTABLISHED and SYN_RECV sockets in
+ *                                    the accept queue at close() or shutdown().
+ * BPF_SK_REUSEPORT_MIGRATE_REQUEST : Migrate NEW_SYN_RECV socket at receiving the
+ *                                    final ACK of 3WHS or retransmitting SYN+ACKs.
+ */
+enum {
+	BPF_SK_REUSEPORT_MIGRATE_NO,
+	BPF_SK_REUSEPORT_MIGRATE_QUEUE,
+	BPF_SK_REUSEPORT_MIGRATE_REQUEST,
+};
+
 struct sk_reuseport_md {
 	/*
 	 * Start of directly accessible data. It begins from