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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-01-09 16:55:26 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-09 16:07:41 -0500
commitf16a7dd5cf27eeda187425c9c7d96802a549f9c4 (patch)
tree0f7b7f3986f6d5d17fdda7af266d09a8f7882e03 /net/smc
parentb38d732477e4211351b2680e805d944f66bceec9 (diff)
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smc: netlink interface for SMC sockets
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>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/Kconfig9
-rw-r--r--net/smc/Makefile1
-rw-r--r--net/smc/af_smc.c43
-rw-r--r--net/smc/smc.h2
-rw-r--r--net/smc/smc_close.c1
-rw-r--r--net/smc/smc_diag.c215
6 files changed, 270 insertions, 1 deletions
diff --git a/net/smc/Kconfig b/net/smc/Kconfig
index bc029803e728..c717ef0896aa 100644
--- a/net/smc/Kconfig
+++ b/net/smc/Kconfig
@@ -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.
diff --git a/net/smc/Makefile b/net/smc/Makefile
index 5cf0cafaa208..188104654b54 100644
--- a/net/smc/Makefile
+++ b/net/smc/Makefile
@@ -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
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 3f543d58bc5c..5d4208ad029e 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -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"
@@ -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)
{
@@ -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);
@@ -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;
@@ -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;
@@ -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;
@@ -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) {
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 959a5d2014ab..ee5fbea24549 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -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
diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c
index d70c05b57021..03dfcc6b7661 100644
--- a/net/smc/smc_close.c
+++ b/net/smc/smc_close.c
@@ -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);
}
diff --git a/net/smc/smc_diag.c b/net/smc/smc_diag.c
new file mode 100644
index 000000000000..d2d01cf70224
--- /dev/null
+++ b/net/smc/smc_diag.c
@@ -0,0 +1,215 @@
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * Monitoring SMC transport protocol sockets
+ *
+ * Copyright IBM Corp. 2016
+ *
+ * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sock_diag.h>
+#include <linux/inet_diag.h>
+#include <linux/smc_diag.h>
+#include <net/netlink.h>
+#include <net/smc.h>
+
+#include "smc.h"
+#include "smc_core.h"
+
+static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
+{
+ sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
+ be16_to_cpu(((__be16 *)gid_raw)[0]),
+ be16_to_cpu(((__be16 *)gid_raw)[1]),
+ be16_to_cpu(((__be16 *)gid_raw)[2]),
+ be16_to_cpu(((__be16 *)gid_raw)[3]),
+ be16_to_cpu(((__be16 *)gid_raw)[4]),
+ be16_to_cpu(((__be16 *)gid_raw)[5]),
+ be16_to_cpu(((__be16 *)gid_raw)[6]),
+ be16_to_cpu(((__be16 *)gid_raw)[7]));
+}
+
+static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
+{
+ struct smc_sock *smc = smc_sk(sk);
+
+ r->diag_family = sk->sk_family;
+ if (!smc->clcsock)
+ return;
+ r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
+ r->id.idiag_dport = smc->clcsock->sk->sk_dport;
+ r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
+ sock_diag_save_cookie(sk, r->id.idiag_cookie);
+ memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
+ memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
+ r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
+ r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
+}
+
+static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
+ struct smc_diag_msg *r,
+ struct user_namespace *user_ns)
+{
+ if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
+ return 1;
+
+ r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
+ r->diag_inode = sock_i_ino(sk);
+ return 0;
+}
+
+static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
+ struct netlink_callback *cb,
+ const struct smc_diag_req *req,
+ struct nlattr *bc)
+{
+ struct smc_sock *smc = smc_sk(sk);
+ struct user_namespace *user_ns;
+ struct smc_diag_msg *r;
+ struct nlmsghdr *nlh;
+
+ nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+ cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ r = nlmsg_data(nlh);
+ smc_diag_msg_common_fill(r, sk);
+ r->diag_state = sk->sk_state;
+ r->diag_fallback = smc->use_fallback;
+ user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
+ if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
+ goto errout;
+
+ if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && smc->conn.lgr) {
+ struct smc_connection *conn = &smc->conn;
+ struct smc_diag_conninfo cinfo = {
+ .token = conn->alert_token_local,
+ .sndbuf_size = conn->sndbuf_size,
+ .rmbe_size = conn->rmbe_size,
+ .peer_rmbe_size = conn->peer_rmbe_size,
+
+ .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
+ .rx_prod.count = conn->local_rx_ctrl.prod.count,
+ .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
+ .rx_cons.count = conn->local_rx_ctrl.cons.count,
+
+ .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
+ .tx_prod.count = conn->local_tx_ctrl.prod.count,
+ .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
+ .tx_cons.count = conn->local_tx_ctrl.cons.count,
+
+ .tx_prod_flags =
+ *(u8 *)&conn->local_tx_ctrl.prod_flags,
+ .tx_conn_state_flags =
+ *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
+ .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
+ .rx_conn_state_flags =
+ *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
+
+ .tx_prep.wrap = conn->tx_curs_prep.wrap,
+ .tx_prep.count = conn->tx_curs_prep.count,
+ .tx_sent.wrap = conn->tx_curs_sent.wrap,
+ .tx_sent.count = conn->tx_curs_sent.count,
+ .tx_fin.wrap = conn->tx_curs_fin.wrap,
+ .tx_fin.count = conn->tx_curs_fin.count,
+ };
+
+ if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
+ goto errout;
+ }
+
+ if ((req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && smc->conn.lgr) {
+ struct smc_diag_lgrinfo linfo = {
+ .role = smc->conn.lgr->role,
+ .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
+ .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
+ };
+
+ memcpy(linfo.lnk[0].ibname,
+ smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
+ sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
+ smc_gid_be16_convert(linfo.lnk[0].gid,
+ smc->conn.lgr->lnk[0].gid.raw);
+ smc_gid_be16_convert(linfo.lnk[0].peer_gid,
+ smc->conn.lgr->lnk[0].peer_gid);
+
+ if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
+ goto errout;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+errout:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *bc = NULL;
+ struct hlist_head *head;
+ struct sock *sk;
+ int rc = 0;
+
+ read_lock(&smc_proto.h.smc_hash->lock);
+ head = &smc_proto.h.smc_hash->ht;
+ if (hlist_empty(head))
+ goto out;
+
+ sk_for_each(sk, head) {
+ if (!net_eq(sock_net(sk), net))
+ continue;
+ rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
+ if (rc)
+ break;
+ }
+
+out:
+ read_unlock(&smc_proto.h.smc_hash->lock);
+ return rc;
+}
+
+static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
+{
+ struct net *net = sock_net(skb->sk);
+
+ if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
+ h->nlmsg_flags & NLM_F_DUMP) {
+ {
+ struct netlink_dump_control c = {
+ .dump = smc_diag_dump,
+ .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, h, &c);
+ }
+ }
+ return 0;
+}
+
+static const struct sock_diag_handler smc_diag_handler = {
+ .family = AF_SMC,
+ .dump = smc_diag_handler_dump,
+};
+
+static int __init smc_diag_init(void)
+{
+ return sock_diag_register(&smc_diag_handler);
+}
+
+static void __exit smc_diag_exit(void)
+{
+ sock_diag_unregister(&smc_diag_handler);
+}
+
+module_init(smc_diag_init);
+module_exit(smc_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);