Commit 462791bb authored by Dust Li's avatar Dust Li Committed by David S. Miller
Browse files

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: default avatarTony Lu <tonylu@linux.alibaba.com>
Signed-off-by: default avatarTony Lu <tonylu@linux.alibaba.com>
Signed-off-by: default avatarDust Li <dust.li@linux.alibaba.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1e385c08

include/net/netns/smc.h

+3 −0
Original line number Diff line number Diff line
@@ -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

net/smc/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

net/smc/af_smc.c

+10 −0
Original line number Diff line number Diff line
@@ -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 @@ static int __init smc_init(void) 
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();

net/smc/smc_sysctl.c

0 → 100644
+70 −0
Original line number Diff line number Diff line 
// 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);

}

net/smc/smc_sysctl.h

0 → 100644
+32 −0
Original line number Diff line number Diff line 
/* 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 */