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-rw-r--r--net/smc/Makefile2
-rw-r--r--net/smc/af_smc.c162
-rw-r--r--net/smc/smc.h38
-rw-r--r--net/smc/smc_core.c7
-rw-r--r--net/smc/smc_inet.c159
-rw-r--r--net/smc/smc_inet.h22
6 files changed, 316 insertions, 74 deletions
diff --git a/net/smc/Makefile b/net/smc/Makefile
index 2c510d543058..60f1c87d5212 100644
--- a/net/smc/Makefile
+++ b/net/smc/Makefile
@@ -4,6 +4,6 @@ obj-$(CONFIG_SMC) += smc.o
obj-$(CONFIG_SMC_DIAG) += smc_diag.o
smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
-smc-y += smc_tracepoint.o
+smc-y += smc_tracepoint.o smc_inet.o
smc-$(CONFIG_SYSCTL) += smc_sysctl.o
smc-$(CONFIG_SMC_LO) += smc_loopback.o
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index c5f98c6b2561..73a875573e7a 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -54,6 +54,7 @@
#include "smc_tracepoint.h"
#include "smc_sysctl.h"
#include "smc_loopback.h"
+#include "smc_inet.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
@@ -170,15 +171,15 @@ static bool smc_hs_congested(const struct sock *sk)
return false;
}
-static struct smc_hashinfo smc_v4_hashinfo = {
+struct smc_hashinfo smc_v4_hashinfo = {
.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
};
-static struct smc_hashinfo smc_v6_hashinfo = {
+struct smc_hashinfo smc_v6_hashinfo = {
.lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
};
-static int smc_hash_sk(struct sock *sk)
+int smc_hash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
struct hlist_head *head;
@@ -193,7 +194,7 @@ static int smc_hash_sk(struct sock *sk)
return 0;
}
-static void smc_unhash_sk(struct sock *sk)
+void smc_unhash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
@@ -207,7 +208,7 @@ static void smc_unhash_sk(struct sock *sk)
* work which we didn't do because of user hold the sock_lock in the
* BH context
*/
-static void smc_release_cb(struct sock *sk)
+void smc_release_cb(struct sock *sk)
{
struct smc_sock *smc = smc_sk(sk);
@@ -307,7 +308,7 @@ static int __smc_release(struct smc_sock *smc)
return rc;
}
-static int smc_release(struct socket *sock)
+int smc_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -361,25 +362,15 @@ static void smc_destruct(struct sock *sk)
return;
}
-static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
- int protocol)
+void smc_sk_init(struct net *net, struct sock *sk, int protocol)
{
- struct smc_sock *smc;
- struct proto *prot;
- struct sock *sk;
-
- prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
- sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
- if (!sk)
- return NULL;
+ struct smc_sock *smc = smc_sk(sk);
- sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
sk->sk_state = SMC_INIT;
sk->sk_destruct = smc_destruct;
sk->sk_protocol = protocol;
WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
- smc = smc_sk(sk);
INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
INIT_WORK(&smc->connect_work, smc_connect_work);
INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
@@ -389,12 +380,30 @@ static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
sk->sk_prot->hash(sk);
mutex_init(&smc->clcsock_release_lock);
smc_init_saved_callbacks(smc);
+ smc->limit_smc_hs = net->smc.limit_smc_hs;
+ smc->use_fallback = false; /* assume rdma capability first */
+ smc->fallback_rsn = 0;
+}
+
+static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
+ int protocol)
+{
+ struct proto *prot;
+ struct sock *sk;
+
+ prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
+ sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
+ if (!sk)
+ return NULL;
+
+ sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
+ smc_sk_init(net, sk, protocol);
return sk;
}
-static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
- int addr_len)
+int smc_bind(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len)
{
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
struct sock *sk = sock->sk;
@@ -1623,8 +1632,8 @@ out:
release_sock(&smc->sk);
}
-static int smc_connect(struct socket *sock, struct sockaddr *addr,
- int alen, int flags)
+int smc_connect(struct socket *sock, struct sockaddr *addr,
+ int alen, int flags)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -2605,7 +2614,7 @@ out:
read_unlock_bh(&listen_clcsock->sk_callback_lock);
}
-static int smc_listen(struct socket *sock, int backlog)
+int smc_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -2670,8 +2679,8 @@ out:
return rc;
}
-static int smc_accept(struct socket *sock, struct socket *new_sock,
- struct proto_accept_arg *arg)
+int smc_accept(struct socket *sock, struct socket *new_sock,
+ struct proto_accept_arg *arg)
{
struct sock *sk = sock->sk, *nsk;
DECLARE_WAITQUEUE(wait, current);
@@ -2740,8 +2749,8 @@ out:
return rc;
}
-static int smc_getname(struct socket *sock, struct sockaddr *addr,
- int peer)
+int smc_getname(struct socket *sock, struct sockaddr *addr,
+ int peer)
{
struct smc_sock *smc;
@@ -2754,7 +2763,7 @@ static int smc_getname(struct socket *sock, struct sockaddr *addr,
return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
}
-static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
+int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -2792,8 +2801,8 @@ out:
return rc;
}
-static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
- int flags)
+int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+ int flags)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -2842,8 +2851,8 @@ static __poll_t smc_accept_poll(struct sock *parent)
return mask;
}
-static __poll_t smc_poll(struct file *file, struct socket *sock,
- poll_table *wait)
+__poll_t smc_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -2895,7 +2904,7 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
return mask;
}
-static int smc_shutdown(struct socket *sock, int how)
+int smc_shutdown(struct socket *sock, int how)
{
struct sock *sk = sock->sk;
bool do_shutdown = true;
@@ -3035,8 +3044,8 @@ static int __smc_setsockopt(struct socket *sock, int level, int optname,
return rc;
}
-static int smc_setsockopt(struct socket *sock, int level, int optname,
- sockptr_t optval, unsigned int optlen)
+int smc_setsockopt(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -3122,8 +3131,8 @@ out:
return rc;
}
-static int smc_getsockopt(struct socket *sock, int level, int optname,
- char __user *optval, int __user *optlen)
+int smc_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
{
struct smc_sock *smc;
int rc;
@@ -3148,8 +3157,8 @@ static int smc_getsockopt(struct socket *sock, int level, int optname,
return rc;
}
-static int smc_ioctl(struct socket *sock, unsigned int cmd,
- unsigned long arg)
+int smc_ioctl(struct socket *sock, unsigned int cmd,
+ unsigned long arg)
{
union smc_host_cursor cons, urg;
struct smc_connection *conn;
@@ -3235,9 +3244,9 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd,
* Note that subsequent recv() calls have to wait till all splice() processing
* completed.
*/
-static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
+ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
@@ -3303,6 +3312,31 @@ static const struct proto_ops smc_sock_ops = {
.splice_read = smc_splice_read,
};
+int smc_create_clcsk(struct net *net, struct sock *sk, int family)
+{
+ struct smc_sock *smc = smc_sk(sk);
+ int rc;
+
+ rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
+ &smc->clcsock);
+ if (rc) {
+ sk_common_release(sk);
+ return rc;
+ }
+
+ /* smc_clcsock_release() does not wait smc->clcsock->sk's
+ * destruction; its sk_state might not be TCP_CLOSE after
+ * smc->sk is close()d, and TCP timers can be fired later,
+ * which need net ref.
+ */
+ sk = smc->clcsock->sk;
+ __netns_tracker_free(net, &sk->ns_tracker, false);
+ sk->sk_net_refcnt = 1;
+ get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
+ sock_inuse_add(net, 1);
+ return 0;
+}
+
static int __smc_create(struct net *net, struct socket *sock, int protocol,
int kern, struct socket *clcsock)
{
@@ -3328,35 +3362,12 @@ static int __smc_create(struct net *net, struct socket *sock, int protocol,
/* create internal TCP socket for CLC handshake and fallback */
smc = smc_sk(sk);
- smc->use_fallback = false; /* assume rdma capability first */
- smc->fallback_rsn = 0;
-
- /* default behavior from limit_smc_hs in every net namespace */
- smc->limit_smc_hs = net->smc.limit_smc_hs;
rc = 0;
- if (!clcsock) {
- rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
- &smc->clcsock);
- if (rc) {
- sk_common_release(sk);
- goto out;
- }
-
- /* smc_clcsock_release() does not wait smc->clcsock->sk's
- * destruction; its sk_state might not be TCP_CLOSE after
- * smc->sk is close()d, and TCP timers can be fired later,
- * which need net ref.
- */
- sk = smc->clcsock->sk;
- __netns_tracker_free(net, &sk->ns_tracker, false);
- sk->sk_net_refcnt = 1;
- get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
- sock_inuse_add(net, 1);
- } else {
+ if (clcsock)
smc->clcsock = clcsock;
- }
-
+ else
+ rc = smc_create_clcsk(net, sk, family);
out:
return rc;
}
@@ -3565,10 +3576,15 @@ static int __init smc_init(void)
pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
goto out_lo;
}
-
+ rc = smc_inet_init();
+ if (rc) {
+ pr_err("%s: smc_inet_init fails with %d\n", __func__, rc);
+ goto out_ulp;
+ }
static_branch_enable(&tcp_have_smc);
return 0;
-
+out_ulp:
+ tcp_unregister_ulp(&smc_ulp_ops);
out_lo:
smc_loopback_exit();
out_ib:
@@ -3605,6 +3621,7 @@ out_pernet_subsys:
static void __exit smc_exit(void)
{
static_branch_disable(&tcp_have_smc);
+ smc_inet_exit();
tcp_unregister_ulp(&smc_ulp_ops);
sock_unregister(PF_SMC);
smc_core_exit();
@@ -3632,4 +3649,9 @@ MODULE_DESCRIPTION("smc socket address family");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_SMC);
MODULE_ALIAS_TCP_ULP("smc");
+/* 256 for IPPROTO_SMC and 1 for SOCK_STREAM */
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 256, 1);
+#if IS_ENABLED(CONFIG_IPV6)
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 256, 1);
+#endif /* CONFIG_IPV6 */
MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 18c8b7870198..34b781e463c4 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -34,6 +34,44 @@
extern struct proto smc_proto;
extern struct proto smc_proto6;
+extern struct smc_hashinfo smc_v4_hashinfo;
+extern struct smc_hashinfo smc_v6_hashinfo;
+
+int smc_hash_sk(struct sock *sk);
+void smc_unhash_sk(struct sock *sk);
+void smc_release_cb(struct sock *sk);
+
+int smc_release(struct socket *sock);
+int smc_bind(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len);
+int smc_connect(struct socket *sock, struct sockaddr *addr,
+ int alen, int flags);
+int smc_accept(struct socket *sock, struct socket *new_sock,
+ struct proto_accept_arg *arg);
+int smc_getname(struct socket *sock, struct sockaddr *addr,
+ int peer);
+__poll_t smc_poll(struct file *file, struct socket *sock,
+ poll_table *wait);
+int smc_ioctl(struct socket *sock, unsigned int cmd,
+ unsigned long arg);
+int smc_listen(struct socket *sock, int backlog);
+int smc_shutdown(struct socket *sock, int how);
+int smc_setsockopt(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int optlen);
+int smc_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen);
+int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len);
+int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+ int flags);
+ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags);
+
+/* smc sock initialization */
+void smc_sk_init(struct net *net, struct sock *sk, int protocol);
+/* clcsock initialization */
+int smc_create_clcsk(struct net *net, struct sock *sk, int family);
+
#ifdef ATOMIC64_INIT
#define KERNEL_HAS_ATOMIC64
#endif
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index fafdb97adfad..3b95828d9976 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -2006,7 +2006,7 @@ out:
}
#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
-#define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */
+#define SMCR_RMBE_SIZES 15 /* 0 -> 16KB, 1 -> 32KB, .. 15 -> 512MB */
/* convert the RMB size into the compressed notation (minimum 16K, see
* SMCD/R_DMBE_SIZES.
@@ -2015,7 +2015,6 @@ out:
*/
static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
{
- const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE;
u8 compressed;
if (size <= SMC_BUF_MIN_SIZE)
@@ -2025,9 +2024,11 @@ static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
compressed = min_t(u8, ilog2(size) + 1,
is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
+#ifdef CONFIG_ARCH_NO_SG_CHAIN
if (!is_smcd && is_rmb)
/* RMBs are backed by & limited to max size of scatterlists */
- compressed = min_t(u8, compressed, ilog2(max_scat >> 14));
+ compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14));
+#endif
return compressed;
}
diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
new file mode 100644
index 000000000000..bece346dd8e9
--- /dev/null
+++ b/net/smc/smc_inet.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * Definitions for the IPPROTO_SMC (socket related)
+ *
+ * Copyright IBM Corp. 2016, 2018
+ * Copyright (c) 2024, Alibaba Inc.
+ *
+ * Author: D. Wythe <alibuda@linux.alibaba.com>
+ */
+
+#include <net/protocol.h>
+#include <net/sock.h>
+
+#include "smc_inet.h"
+#include "smc.h"
+
+static int smc_inet_init_sock(struct sock *sk);
+
+static struct proto smc_inet_prot = {
+ .name = "INET_SMC",
+ .owner = THIS_MODULE,
+ .init = smc_inet_init_sock,
+ .hash = smc_hash_sk,
+ .unhash = smc_unhash_sk,
+ .release_cb = smc_release_cb,
+ .obj_size = sizeof(struct smc_sock),
+ .h.smc_hash = &smc_v4_hashinfo,
+ .slab_flags = SLAB_TYPESAFE_BY_RCU,
+};
+
+static const struct proto_ops smc_inet_stream_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = smc_release,
+ .bind = smc_bind,
+ .connect = smc_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = smc_accept,
+ .getname = smc_getname,
+ .poll = smc_poll,
+ .ioctl = smc_ioctl,
+ .listen = smc_listen,
+ .shutdown = smc_shutdown,
+ .setsockopt = smc_setsockopt,
+ .getsockopt = smc_getsockopt,
+ .sendmsg = smc_sendmsg,
+ .recvmsg = smc_recvmsg,
+ .mmap = sock_no_mmap,
+ .splice_read = smc_splice_read,
+};
+
+static struct inet_protosw smc_inet_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_SMC,
+ .prot = &smc_inet_prot,
+ .ops = &smc_inet_stream_ops,
+ .flags = INET_PROTOSW_ICSK,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct proto smc_inet6_prot = {
+ .name = "INET6_SMC",
+ .owner = THIS_MODULE,
+ .init = smc_inet_init_sock,
+ .hash = smc_hash_sk,
+ .unhash = smc_unhash_sk,
+ .release_cb = smc_release_cb,
+ .obj_size = sizeof(struct smc_sock),
+ .h.smc_hash = &smc_v6_hashinfo,
+ .slab_flags = SLAB_TYPESAFE_BY_RCU,
+};
+
+static const struct proto_ops smc_inet6_stream_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = smc_release,
+ .bind = smc_bind,
+ .connect = smc_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = smc_accept,
+ .getname = smc_getname,
+ .poll = smc_poll,
+ .ioctl = smc_ioctl,
+ .listen = smc_listen,
+ .shutdown = smc_shutdown,
+ .setsockopt = smc_setsockopt,
+ .getsockopt = smc_getsockopt,
+ .sendmsg = smc_sendmsg,
+ .recvmsg = smc_recvmsg,
+ .mmap = sock_no_mmap,
+ .splice_read = smc_splice_read,
+};
+
+static struct inet_protosw smc_inet6_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_SMC,
+ .prot = &smc_inet6_prot,
+ .ops = &smc_inet6_stream_ops,
+ .flags = INET_PROTOSW_ICSK,
+};
+#endif /* CONFIG_IPV6 */
+
+static int smc_inet_init_sock(struct sock *sk)
+{
+ struct net *net = sock_net(sk);
+
+ /* init common smc sock */
+ smc_sk_init(net, sk, IPPROTO_SMC);
+ /* create clcsock */
+ return smc_create_clcsk(net, sk, sk->sk_family);
+}
+
+int __init smc_inet_init(void)
+{
+ int rc;
+
+ rc = proto_register(&smc_inet_prot, 1);
+ if (rc) {
+ pr_err("%s: proto_register smc_inet_prot fails with %d\n",
+ __func__, rc);
+ return rc;
+ }
+ /* no return value */
+ inet_register_protosw(&smc_inet_protosw);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ rc = proto_register(&smc_inet6_prot, 1);
+ if (rc) {
+ pr_err("%s: proto_register smc_inet6_prot fails with %d\n",
+ __func__, rc);
+ goto out_inet6_prot;
+ }
+ rc = inet6_register_protosw(&smc_inet6_protosw);
+ if (rc) {
+ pr_err("%s: inet6_register_protosw smc_inet6_protosw fails with %d\n",
+ __func__, rc);
+ goto out_inet6_protosw;
+ }
+ return rc;
+out_inet6_protosw:
+ proto_unregister(&smc_inet6_prot);
+out_inet6_prot:
+ inet_unregister_protosw(&smc_inet_protosw);
+ proto_unregister(&smc_inet_prot);
+#endif /* CONFIG_IPV6 */
+ return rc;
+}
+
+void smc_inet_exit(void)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ inet6_unregister_protosw(&smc_inet6_protosw);
+ proto_unregister(&smc_inet6_prot);
+#endif /* CONFIG_IPV6 */
+ inet_unregister_protosw(&smc_inet_protosw);
+ proto_unregister(&smc_inet_prot);
+}
diff --git a/net/smc/smc_inet.h b/net/smc/smc_inet.h
new file mode 100644
index 000000000000..a489c8a2b8ef
--- /dev/null
+++ b/net/smc/smc_inet.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * Definitions for the IPPROTO_SMC (socket related)
+
+ * Copyright IBM Corp. 2016
+ * Copyright (c) 2024, Alibaba Inc.
+ *
+ * Author: D. Wythe <alibuda@linux.alibaba.com>
+ */
+#ifndef __INET_SMC
+#define __INET_SMC
+
+/* Initialize protocol registration on IPPROTO_SMC,
+ * @return 0 on success
+ */
+int smc_inet_init(void);
+
+void smc_inet_exit(void);
+
+#endif /* __INET_SMC */
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