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Date: Mon, 21 Aug 2023 15:25:14 -0700
From: Mat Martineau <martineau@...nel.org>
To: Matthieu Baerts <matthieu.baerts@...sares.net>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev,
Geliang Tang <geliang.tang@...e.com>, Mat Martineau <martineau@...nel.org>
Subject: [PATCH net-next 03/10] mptcp: add struct mptcp_sched_ops
From: Geliang Tang <geliang.tang@...e.com>
This patch defines struct mptcp_sched_ops, which has three struct members,
name, owner and list, and four function pointers: init(), release() and
get_subflow().
The scheduler function get_subflow() have a struct mptcp_sched_data
parameter, which contains a reinject flag for retrans or not, a subflows
number and a mptcp_subflow_context array.
Add the scheduler registering, unregistering and finding functions to add,
delete and find a packet scheduler on the global list mptcp_sched_list.
Acked-by: Paolo Abeni <pabeni@...hat.com>
Reviewed-by: Mat Martineau <martineau@...nel.org>
Signed-off-by: Geliang Tang <geliang.tang@...e.com>
Signed-off-by: Mat Martineau <martineau@...nel.org>
---
include/net/mptcp.h | 21 ++++++++++++++++++++
net/mptcp/Makefile | 2 +-
net/mptcp/protocol.h | 3 +++
net/mptcp/sched.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 81 insertions(+), 1 deletion(-)
diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index 3c5c68618fcc..fb996124b3d5 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -96,6 +96,27 @@ struct mptcp_out_options {
#endif
};
+#define MPTCP_SCHED_NAME_MAX 16
+#define MPTCP_SUBFLOWS_MAX 8
+
+struct mptcp_sched_data {
+ bool reinject;
+ u8 subflows;
+ struct mptcp_subflow_context *contexts[MPTCP_SUBFLOWS_MAX];
+};
+
+struct mptcp_sched_ops {
+ int (*get_subflow)(struct mptcp_sock *msk,
+ struct mptcp_sched_data *data);
+
+ char name[MPTCP_SCHED_NAME_MAX];
+ struct module *owner;
+ struct list_head list;
+
+ void (*init)(struct mptcp_sock *msk);
+ void (*release)(struct mptcp_sock *msk);
+} ____cacheline_aligned_in_smp;
+
#ifdef CONFIG_MPTCP
void mptcp_init(void);
diff --git a/net/mptcp/Makefile b/net/mptcp/Makefile
index a3829ce548f9..84e531f86b82 100644
--- a/net/mptcp/Makefile
+++ b/net/mptcp/Makefile
@@ -2,7 +2,7 @@
obj-$(CONFIG_MPTCP) += mptcp.o
mptcp-y := protocol.o subflow.o options.o token.o crypto.o ctrl.o pm.o diag.o \
- mib.o pm_netlink.o sockopt.o pm_userspace.o fastopen.o
+ mib.o pm_netlink.o sockopt.o pm_userspace.o fastopen.o sched.o
obj-$(CONFIG_SYN_COOKIES) += syncookies.o
obj-$(CONFIG_INET_MPTCP_DIAG) += mptcp_diag.o
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index cbf9a9e176b2..985e8f86668d 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -655,6 +655,9 @@ int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,
void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
struct sockaddr_storage *addr,
unsigned short family);
+struct mptcp_sched_ops *mptcp_sched_find(const char *name);
+int mptcp_register_scheduler(struct mptcp_sched_ops *sched);
+void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched);
static inline bool __tcp_can_send(const struct sock *ssk)
{
diff --git a/net/mptcp/sched.c b/net/mptcp/sched.c
new file mode 100644
index 000000000000..c5d3bbafba71
--- /dev/null
+++ b/net/mptcp/sched.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Multipath TCP
+ *
+ * Copyright (c) 2022, SUSE.
+ */
+
+#define pr_fmt(fmt) "MPTCP: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/rculist.h>
+#include <linux/spinlock.h>
+#include "protocol.h"
+
+static DEFINE_SPINLOCK(mptcp_sched_list_lock);
+static LIST_HEAD(mptcp_sched_list);
+
+/* Must be called with rcu read lock held */
+struct mptcp_sched_ops *mptcp_sched_find(const char *name)
+{
+ struct mptcp_sched_ops *sched, *ret = NULL;
+
+ list_for_each_entry_rcu(sched, &mptcp_sched_list, list) {
+ if (!strcmp(sched->name, name)) {
+ ret = sched;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+int mptcp_register_scheduler(struct mptcp_sched_ops *sched)
+{
+ if (!sched->get_subflow)
+ return -EINVAL;
+
+ spin_lock(&mptcp_sched_list_lock);
+ if (mptcp_sched_find(sched->name)) {
+ spin_unlock(&mptcp_sched_list_lock);
+ return -EEXIST;
+ }
+ list_add_tail_rcu(&sched->list, &mptcp_sched_list);
+ spin_unlock(&mptcp_sched_list_lock);
+
+ pr_debug("%s registered", sched->name);
+ return 0;
+}
+
+void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched)
+{
+ spin_lock(&mptcp_sched_list_lock);
+ list_del_rcu(&sched->list);
+ spin_unlock(&mptcp_sched_list_lock);
+}
--
2.41.0
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