net/smc: add sysctl interface for SMC

This patch add sysctl interface to support container environment
for SMC as we talk in the mail list.

Link: https://lore.kernel.org/netdev/20220224020253.GF5443@linux.alibaba.com
Co-developed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dust Li 2022-03-01 17:43:56 +08:00 committed by David S. Miller
parent 1e385c0824
commit 462791bbfa
5 changed files with 116 additions and 1 deletions

View File

@ -14,5 +14,8 @@ struct netns_smc {
struct smc_stats_rsn *fback_rsn;
bool limit_smc_hs; /* constraint on handshake */
#ifdef CONFIG_SYSCTL
struct ctl_table_header *smc_hdr;
#endif
};
#endif

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@ -4,4 +4,4 @@ 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_sysctl.o

View File

@ -51,6 +51,7 @@
#include "smc_close.h"
#include "smc_stats.h"
#include "smc_tracepoint.h"
#include "smc_sysctl.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
@ -3273,9 +3274,17 @@ static int __init smc_init(void)
goto out_sock;
}
rc = smc_sysctl_init();
if (rc) {
pr_err("%s: sysctl_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_sock:
sock_unregister(PF_SMC);
out_proto6:
@ -3303,6 +3312,7 @@ out_pernet_subsys:
static void __exit smc_exit(void)
{
static_branch_disable(&tcp_have_smc);
smc_sysctl_exit();
tcp_unregister_ulp(&smc_ulp_ops);
sock_unregister(PF_SMC);
smc_core_exit();

70
net/smc/smc_sysctl.c Normal file
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@ -0,0 +1,70 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* smc_sysctl.c: sysctl interface to SMC subsystem.
*
* Copyright (c) 2022, Alibaba Inc.
*
* Author: Tony Lu <tonylu@linux.alibaba.com>
*
*/
#include <linux/init.h>
#include <linux/sysctl.h>
#include <net/net_namespace.h>
#include "smc_sysctl.h"
static struct ctl_table smc_table[] = {
{ }
};
static __net_init int smc_sysctl_init_net(struct net *net)
{
struct ctl_table *table;
table = smc_table;
if (!net_eq(net, &init_net)) {
int i;
table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
if (!table)
goto err_alloc;
for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
table[i].data += (void *)net - (void *)&init_net;
}
net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
if (!net->smc.smc_hdr)
goto err_reg;
return 0;
err_reg:
if (!net_eq(net, &init_net))
kfree(table);
err_alloc:
return -ENOMEM;
}
static __net_exit void smc_sysctl_exit_net(struct net *net)
{
unregister_net_sysctl_table(net->smc.smc_hdr);
}
static struct pernet_operations smc_sysctl_ops __net_initdata = {
.init = smc_sysctl_init_net,
.exit = smc_sysctl_exit_net,
};
int __init smc_sysctl_init(void)
{
return register_pernet_subsys(&smc_sysctl_ops);
}
void smc_sysctl_exit(void)
{
unregister_pernet_subsys(&smc_sysctl_ops);
}

32
net/smc/smc_sysctl.h Normal file
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@ -0,0 +1,32 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* smc_sysctl.c: sysctl interface to SMC subsystem.
*
* Copyright (c) 2022, Alibaba Inc.
*
* Author: Tony Lu <tonylu@linux.alibaba.com>
*
*/
#ifndef _SMC_SYSCTL_H
#define _SMC_SYSCTL_H
#ifdef CONFIG_SYSCTL
int smc_sysctl_init(void);
void smc_sysctl_exit(void);
#else
int smc_sysctl_init(void)
{
return 0;
}
void smc_sysctl_exit(void) { }
#endif /* CONFIG_SYSCTL */
#endif /* _SMC_SYSCTL_H */