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net/smc: Introduce IPPROTO_SMC

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This patch allows to create smc socket via AF_INET,
similar to the following code,

/* create v4 smc sock */
v4 = socket(AF_INET, SOCK_STREAM, IPPROTO_SMC);

/* create v6 smc sock */
v6 = socket(AF_INET6, SOCK_STREAM, IPPROTO_SMC);

There are several reasons why we believe it is appropriate here:

1. For smc sockets, it actually use IPv4 (AF-INET) or IPv6 (AF-INET6)
address. There is no AF_SMC address at all.

2. Create smc socket in the AF_INET(6) path, which allows us to reuse
the infrastructure of AF_INET(6) path, such as common ebpf hooks.
Otherwise, smc have to implement it again in AF_SMC path.

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Tested-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
D. Wythe 2024-06-14 02:00:30 +08:00 committed by David S. Miller
parent 13543d02c9
commit d25a92ccae
5 changed files with 198 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/in.h
View File

@ -81,6 +81,8 @@ enum {
#define IPPROTO_ETHERNET IPPROTO_ETHERNET
IPPROTO_RAW = 255, /* Raw IP packets */
#define IPPROTO_RAW IPPROTO_RAW
IPPROTO_SMC = 256, /* Shared Memory Communications */
#define IPPROTO_SMC IPPROTO_SMC
IPPROTO_MPTCP = 262, /* Multipath TCP connection */
#define IPPROTO_MPTCP IPPROTO_MPTCP
IPPROTO_MAX

2
net/smc/Makefile
View File

@ -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

16
net/smc/af_smc.c
View File

@ -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
@ -3575,10 +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:
@ -3615,6 +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();
@ -3642,4 +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);

159
net/smc/smc_inet.c Normal file
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@ -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);
}

22
net/smc/smc_inet.h Normal file
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@ -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 */