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smc: netlink interface for SMC sockets
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Support for SMC socket monitoring via netlink sockets of protocol
NETLINK_SOCK_DIAG.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Ursula Braun authored and davem330 committed Jan 9, 2017
1 parent b38d732 commit f16a7dd
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Showing 10 changed files with 379 additions and 1 deletion.
20 changes: 20 additions & 0 deletions include/net/smc.h
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Definitions for the SMC module (socket related)
*
* Copyright IBM Corp. 2016
*
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
*/
#ifndef _SMC_H
#define _SMC_H

struct smc_hashinfo {
rwlock_t lock;
struct hlist_head ht;
};

int smc_hash_sk(struct sock *sk);
void smc_unhash_sk(struct sock *sk);
#endif /* _SMC_H */
3 changes: 3 additions & 0 deletions include/net/sock.h
Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,7 @@
#include <net/checksum.h>
#include <net/tcp_states.h>
#include <linux/net_tstamp.h>
#include <net/smc.h>

/*
* This structure really needs to be cleaned up.
Expand Down Expand Up @@ -986,6 +987,7 @@ struct request_sock_ops;
struct timewait_sock_ops;
struct inet_hashinfo;
struct raw_hashinfo;
struct smc_hashinfo;
struct module;

/*
Expand Down Expand Up @@ -1094,6 +1096,7 @@ struct proto {
struct inet_hashinfo *hashinfo;
struct udp_table *udp_table;
struct raw_hashinfo *raw_hash;
struct smc_hashinfo *smc_hash;
} h;

struct module *owner;
Expand Down
1 change: 1 addition & 0 deletions include/uapi/linux/netlink.h
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
#define NETLINK_ECRYPTFS 19
#define NETLINK_RDMA 20
#define NETLINK_CRYPTO 21 /* Crypto layer */
#define NETLINK_SMC 22 /* SMC monitoring */

#define NETLINK_INET_DIAG NETLINK_SOCK_DIAG

Expand Down
85 changes: 85 additions & 0 deletions include/uapi/linux/smc_diag.h
Original file line number Diff line number Diff line change
@@ -0,0 +1,85 @@
#ifndef _UAPI_SMC_DIAG_H_
#define _UAPI_SMC_DIAG_H_

#include <linux/types.h>
#include <linux/inet_diag.h>
#include <rdma/ib_verbs.h>

/* Request structure */
struct smc_diag_req {
__u8 diag_family;
__u8 pad[2];
__u8 diag_ext; /* Query extended information */
struct inet_diag_sockid id;
};

/* Base info structure. It contains socket identity (addrs/ports/cookie) based
* on the internal clcsock, and more SMC-related socket data
*/
struct smc_diag_msg {
__u8 diag_family;
__u8 diag_state;
__u8 diag_fallback;
__u8 diag_shutdown;
struct inet_diag_sockid id;

__u32 diag_uid;
__u64 diag_inode;
};

/* Extensions */

enum {
SMC_DIAG_NONE,
SMC_DIAG_CONNINFO,
SMC_DIAG_LGRINFO,
SMC_DIAG_SHUTDOWN,
__SMC_DIAG_MAX,
};

#define SMC_DIAG_MAX (__SMC_DIAG_MAX - 1)

/* SMC_DIAG_CONNINFO */

struct smc_diag_cursor {
__u16 reserved;
__u16 wrap;
__u32 count;
};

struct smc_diag_conninfo {
__u32 token; /* unique connection id */
__u32 sndbuf_size; /* size of send buffer */
__u32 rmbe_size; /* size of RMB element */
__u32 peer_rmbe_size; /* size of peer RMB element */
/* local RMB element cursors */
struct smc_diag_cursor rx_prod; /* received producer cursor */
struct smc_diag_cursor rx_cons; /* received consumer cursor */
/* peer RMB element cursors */
struct smc_diag_cursor tx_prod; /* sent producer cursor */
struct smc_diag_cursor tx_cons; /* sent consumer cursor */
__u8 rx_prod_flags; /* received producer flags */
__u8 rx_conn_state_flags; /* recvd connection flags*/
__u8 tx_prod_flags; /* sent producer flags */
__u8 tx_conn_state_flags; /* sent connection flags*/
/* send buffer cursors */
struct smc_diag_cursor tx_prep; /* prepared to be sent cursor */
struct smc_diag_cursor tx_sent; /* sent cursor */
struct smc_diag_cursor tx_fin; /* confirmed sent cursor */
};

/* SMC_DIAG_LINKINFO */

struct smc_diag_linkinfo {
__u8 link_id; /* link identifier */
__u8 ibname[IB_DEVICE_NAME_MAX]; /* name of the RDMA device */
__u8 ibport; /* RDMA device port number */
__u8 gid[40]; /* local GID */
__u8 peer_gid[40]; /* peer GID */
};

struct smc_diag_lgrinfo {
struct smc_diag_linkinfo lnk[1];
__u8 role;
};
#endif /* _UAPI_SMC_DIAG_H_ */
9 changes: 9 additions & 0 deletions net/smc/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -9,3 +9,12 @@ config SMC
a separate socket family SMC.

Select this option if you want to run SMC socket applications

config SMC_DIAG
tristate "SMC: socket monitoring interface"
depends on SMC
---help---
Support for SMC socket monitoring interface used by tools such as
smcss.

if unsure, say Y.
1 change: 1 addition & 0 deletions net/smc/Makefile
Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
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
43 changes: 42 additions & 1 deletion net/smc/af_smc.c
Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
#include <linux/in.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/smc.h>

#include "smc.h"
#include "smc_clc.h"
Expand Down Expand Up @@ -59,13 +60,48 @@ static void smc_set_keepalive(struct sock *sk, int val)
smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
}

static struct proto smc_proto = {
static struct smc_hashinfo smc_v4_hashinfo = {
.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
};

int smc_hash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
struct hlist_head *head;

head = &h->ht;

write_lock_bh(&h->lock);
sk_add_node(sk, head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
write_unlock_bh(&h->lock);

return 0;
}
EXPORT_SYMBOL_GPL(smc_hash_sk);

void smc_unhash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;

write_lock_bh(&h->lock);
if (sk_del_node_init(sk))
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
write_unlock_bh(&h->lock);
}
EXPORT_SYMBOL_GPL(smc_unhash_sk);

struct proto smc_proto = {
.name = "SMC",
.owner = THIS_MODULE,
.keepalive = smc_set_keepalive,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.obj_size = sizeof(struct smc_sock),
.h.smc_hash = &smc_v4_hashinfo,
.slab_flags = SLAB_DESTROY_BY_RCU,
};
EXPORT_SYMBOL_GPL(smc_proto);

static int smc_release(struct socket *sock)
{
Expand Down Expand Up @@ -109,6 +145,7 @@ static int smc_release(struct socket *sock)
schedule_delayed_work(&smc->sock_put_work,
SMC_CLOSE_SOCK_PUT_DELAY);
}
sk->sk_prot->unhash(sk);
release_sock(sk);

sock_put(sk);
Expand Down Expand Up @@ -144,6 +181,7 @@ static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
INIT_LIST_HEAD(&smc->accept_q);
spin_lock_init(&smc->accept_q_lock);
INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work);
sk->sk_prot->hash(sk);
sk_refcnt_debug_inc(sk);

return sk;
Expand Down Expand Up @@ -536,6 +574,7 @@ static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
lsmc->sk.sk_err = -rc;
new_sk->sk_state = SMC_CLOSED;
sock_set_flag(new_sk, SOCK_DEAD);
sk->sk_prot->unhash(new_sk);
sock_put(new_sk);
*new_smc = NULL;
goto out;
Expand All @@ -545,6 +584,7 @@ static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
sock_release(new_clcsock);
new_sk->sk_state = SMC_CLOSED;
sock_set_flag(new_sk, SOCK_DEAD);
sk->sk_prot->unhash(new_sk);
sock_put(new_sk);
*new_smc = NULL;
goto out;
Expand Down Expand Up @@ -1320,6 +1360,7 @@ static int __init smc_init(void)
pr_err("%s: sock_register fails with %d\n", __func__, rc);
goto out_proto;
}
INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);

rc = smc_ib_register_client();
if (rc) {
Expand Down
2 changes: 2 additions & 0 deletions net/smc/smc.h
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@

#define SMC_MAX_PORTS 2 /* Max # of ports */

extern struct proto smc_proto;

#ifdef ATOMIC64_INIT
#define KERNEL_HAS_ATOMIC64
#endif
Expand Down
1 change: 1 addition & 0 deletions net/smc/smc_close.c
Original file line number Diff line number Diff line change
Expand Up @@ -384,6 +384,7 @@ void smc_close_sock_put_work(struct work_struct *work)
struct smc_sock,
sock_put_work);

smc->sk.sk_prot->unhash(&smc->sk);
sock_put(&smc->sk);
}

Expand Down
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