net/sock: Introduce trace_sk_data_ready()

As suggested by Cong, introduce a tracepoint for all ->sk_data_ready()
callback implementations.  For example:

<...>
  iperf-609  [002] .....  70.660425: sk_data_ready: family=2 protocol=6 func=sock_def_readable
  iperf-609  [002] .....  70.660436: sk_data_ready: family=2 protocol=6 func=sock_def_readable
<...>

Suggested-by: Cong Wang <[email protected]>
Signed-off-by: Peilin Ye <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

drivers/infiniband/hw/erdma/erdma_cm.c

@@ -11,6 +11,7 @@
 /* Copyright (c) 2017, Open Grid Computing, Inc. */
 
 #include <linux/workqueue.h>
+#include <trace/events/sock.h>
 
 #include "erdma.h"
 #include "erdma_cm.h"
@@ -925,6 +926,8 @@ static void erdma_cm_llp_data_ready(struct sock *sk)
 {
 	struct erdma_cep *cep;
 
+	trace_sk_data_ready(sk);
+
 	read_lock(&sk->sk_callback_lock);
 
 	cep = sk_to_cep(sk);

drivers/infiniband/sw/siw/siw_cm.c

@@ -16,6 +16,7 @@
 #include <net/tcp.h>
 #include <linux/inet.h>
 #include <linux/tcp.h>
+#include <trace/events/sock.h>
 
 #include <rdma/iw_cm.h>
 #include <rdma/ib_verbs.h>
@@ -109,6 +110,8 @@ static void siw_rtr_data_ready(struct sock *sk)
 	struct siw_qp *qp = NULL;
 	read_descriptor_t rd_desc;
 
+	trace_sk_data_ready(sk);
+
 	read_lock(&sk->sk_callback_lock);
 
 	cep = sk_to_cep(sk);
@@ -1216,6 +1219,8 @@ static void siw_cm_llp_data_ready(struct sock *sk)
 {
 	struct siw_cep *cep;
 
+	trace_sk_data_ready(sk);
+
 	read_lock(&sk->sk_callback_lock);
 
 	cep = sk_to_cep(sk);

drivers/infiniband/sw/siw/siw_qp.c

@@ -10,6 +10,7 @@
 #include <linux/llist.h>
 #include <asm/barrier.h>
 #include <net/tcp.h>
+#include <trace/events/sock.h>
 
 #include "siw.h"
 #include "siw_verbs.h"
@@ -94,6 +95,8 @@ void siw_qp_llp_data_ready(struct sock *sk)
 {
 	struct siw_qp *qp;
 
+	trace_sk_data_ready(sk);
+
 	read_lock(&sk->sk_callback_lock);
 
 	if (unlikely(!sk->sk_user_data || !sk_to_qp(sk)))

drivers/nvme/host/tcp.c

@@ -14,6 +14,7 @@
 #include <linux/blk-mq.h>
 #include <crypto/hash.h>
 #include <net/busy_poll.h>
+#include <trace/events/sock.h>
 
 #include "nvme.h"
 #include "fabrics.h"
@@ -905,6 +906,8 @@ static void nvme_tcp_data_ready(struct sock *sk)
 {
 	struct nvme_tcp_queue *queue;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	queue = sk->sk_user_data;
 	if (likely(queue && queue->rd_enabled) &&

drivers/nvme/target/tcp.c

@@ -14,6 +14,7 @@
 #include <linux/inet.h>
 #include <linux/llist.h>
 #include <crypto/hash.h>
+#include <trace/events/sock.h>
 
 #include "nvmet.h"
 
@@ -1470,6 +1471,8 @@ static void nvmet_tcp_data_ready(struct sock *sk)
 {
 	struct nvmet_tcp_queue *queue;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	queue = sk->sk_user_data;
 	if (likely(queue))
@@ -1667,6 +1670,8 @@ static void nvmet_tcp_listen_data_ready(struct sock *sk)
 {
 	struct nvmet_tcp_port *port;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	port = sk->sk_user_data;
 	if (!port)

drivers/scsi/iscsi_tcp.c

@@ -36,6 +36,7 @@
 #include <scsi/scsi.h>
 #include <scsi/scsi_transport_iscsi.h>
 #include <trace/events/iscsi.h>
+#include <trace/events/sock.h>
 
 #include "iscsi_tcp.h"
 
@@ -170,6 +171,8 @@ static void iscsi_sw_tcp_data_ready(struct sock *sk)
 	struct iscsi_tcp_conn *tcp_conn;
 	struct iscsi_conn *conn;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	conn = sk->sk_user_data;
 	if (!conn) {

drivers/soc/qcom/qmi_interface.c

@@ -12,6 +12,7 @@
 #include <linux/string.h>
 #include <net/sock.h>
 #include <linux/workqueue.h>
+#include <trace/events/sock.h>
 #include <linux/soc/qcom/qmi.h>
 
 static struct socket *qmi_sock_create(struct qmi_handle *qmi,
@@ -569,6 +570,8 @@ static void qmi_data_ready(struct sock *sk)
 {
 	struct qmi_handle *qmi = sk->sk_user_data;
 
+	trace_sk_data_ready(sk);
+
 	/*
 	 * This will be NULL if we receive data while being in
 	 * qmi_handle_release()

drivers/target/iscsi/iscsi_target_nego.c

@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/sched/signal.h>
 #include <net/sock.h>
+#include <trace/events/sock.h>
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
@@ -384,6 +385,7 @@ static void iscsi_target_sk_data_ready(struct sock *sk)
 	struct iscsit_conn *conn = sk->sk_user_data;
 	bool rc;
 
+	trace_sk_data_ready(sk);
 	pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 
 	write_lock_bh(&sk->sk_callback_lock);

drivers/xen/pvcalls-back.c

@@ -14,6 +14,7 @@
 #include <net/inet_common.h>
 #include <net/inet_connection_sock.h>
 #include <net/request_sock.h>
+#include <trace/events/sock.h>
 
 #include <xen/events.h>
 #include <xen/grant_table.h>
@@ -300,6 +301,8 @@ static void pvcalls_sk_data_ready(struct sock *sock)
 	struct sock_mapping *map = sock->sk_user_data;
 	struct pvcalls_ioworker *iow;
 
+	trace_sk_data_ready(sock);
+
 	if (map == NULL)
 		return;
 
@@ -588,6 +591,8 @@ static void pvcalls_pass_sk_data_ready(struct sock *sock)
 	unsigned long flags;
 	int notify;
 
+	trace_sk_data_ready(sock);
+
 	if (mappass == NULL)
 		return;
 

fs/dlm/lowcomms.c

@@ -54,6 +54,7 @@
 #include <net/ipv6.h>
 
 #include <trace/events/dlm.h>
+#include <trace/events/sock.h>
 
 #include "dlm_internal.h"
 #include "lowcomms.h"
@@ -499,6 +500,8 @@ static void lowcomms_data_ready(struct sock *sk)
 {
 	struct connection *con = sock2con(sk);
 
+	trace_sk_data_ready(sk);
+
 	set_bit(CF_RECV_INTR, &con->flags);
 	lowcomms_queue_rwork(con);
 }
@@ -530,6 +533,8 @@ static void lowcomms_state_change(struct sock *sk)
 
 static void lowcomms_listen_data_ready(struct sock *sk)
 {
+	trace_sk_data_ready(sk);
+
 	queue_work(io_workqueue, &listen_con.rwork);
 }
 

fs/ocfs2/cluster/tcp.c

@@ -46,6 +46,7 @@
 #include <linux/net.h>
 #include <linux/export.h>
 #include <net/tcp.h>
+#include <trace/events/sock.h>
 
 #include <linux/uaccess.h>
 
@@ -585,6 +586,8 @@ static void o2net_data_ready(struct sock *sk)
 	void (*ready)(struct sock *sk);
 	struct o2net_sock_container *sc;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	sc = sk->sk_user_data;
 	if (sc) {
@@ -1931,6 +1934,8 @@ static void o2net_listen_data_ready(struct sock *sk)
 {
 	void (*ready)(struct sock *sk);
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 	ready = sk->sk_user_data;
 	if (ready == NULL) { /* check for teardown race */

include/trace/events/sock.h

@@ -263,6 +263,30 @@ TRACE_EVENT(inet_sk_error_report,
 		  __entry->error)
 );
 
+TRACE_EVENT(sk_data_ready,
+
+	TP_PROTO(const struct sock *sk),
+
+	TP_ARGS(sk),
+
+	TP_STRUCT__entry(
+		__field(const void *, skaddr)
+		__field(__u16, family)
+		__field(__u16, protocol)
+		__field(unsigned long, ip)
+	),
+
+	TP_fast_assign(
+		__entry->skaddr = sk;
+		__entry->family = sk->sk_family;
+		__entry->protocol = sk->sk_protocol;
+		__entry->ip = _RET_IP_;
+	),
+
+	TP_printk("family=%u protocol=%u func=%ps",
+		  __entry->family, __entry->protocol, (void *)__entry->ip)
+);
+
 /*
  * sock send/recv msg length
  */

net/bluetooth/rfcomm/core.c

@@ -35,6 +35,8 @@
 #include <net/bluetooth/l2cap.h>
 #include <net/bluetooth/rfcomm.h>
 
+#include <trace/events/sock.h>
+
 #define VERSION "1.11"
 
 static bool disable_cfc;
@@ -186,6 +188,8 @@ static void rfcomm_l2state_change(struct sock *sk)
 
 static void rfcomm_l2data_ready(struct sock *sk)
 {
+	trace_sk_data_ready(sk);
+
 	BT_DBG("%p", sk);
 	rfcomm_schedule();
 }

net/ceph/messenger.c

@@ -17,6 +17,7 @@
 #endif	/* CONFIG_BLOCK */
 #include <linux/dns_resolver.h>
 #include <net/tcp.h>
+#include <trace/events/sock.h>
 
 #include <linux/ceph/ceph_features.h>
 #include <linux/ceph/libceph.h>
@@ -344,6 +345,9 @@ static void con_sock_state_closed(struct ceph_connection *con)
 static void ceph_sock_data_ready(struct sock *sk)
 {
 	struct ceph_connection *con = sk->sk_user_data;
+
+	trace_sk_data_ready(sk);
+
 	if (atomic_read(&con->msgr->stopping)) {
 		return;
 	}

net/core/net-traces.c

@@ -61,3 +61,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(napi_poll);
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(tcp_send_reset);
 EXPORT_TRACEPOINT_SYMBOL_GPL(tcp_bad_csum);
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(sk_data_ready);

net/core/skmsg.c

@@ -8,6 +8,7 @@
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <net/tls.h>
+#include <trace/events/sock.h>
 
 static bool sk_msg_try_coalesce_ok(struct sk_msg *msg, int elem_first_coalesce)
 {
@@ -1114,6 +1115,8 @@ static void sk_psock_strp_data_ready(struct sock *sk)
 {
 	struct sk_psock *psock;
 
+	trace_sk_data_ready(sk);
+
 	rcu_read_lock();
 	psock = sk_psock(sk);
 	if (likely(psock)) {
@@ -1210,6 +1213,8 @@ static void sk_psock_verdict_data_ready(struct sock *sk)
 {
 	struct socket *sock = sk->sk_socket;
 
+	trace_sk_data_ready(sk);
+
 	if (unlikely(!sock || !sock->ops || !sock->ops->read_skb))
 		return;
 	sock->ops->read_skb(sk, sk_psock_verdict_recv);

net/core/sock.c

@@ -3291,6 +3291,8 @@ void sock_def_readable(struct sock *sk)
 {
 	struct socket_wq *wq;
 
+	trace_sk_data_ready(sk);
+
 	rcu_read_lock();
 	wq = rcu_dereference(sk->sk_wq);
 	if (skwq_has_sleeper(wq))

net/kcm/kcmsock.c

@@ -28,6 +28,7 @@
 #include <net/netns/generic.h>
 #include <net/sock.h>
 #include <uapi/linux/kcm.h>
+#include <trace/events/sock.h>
 
 unsigned int kcm_net_id;
 
@@ -349,6 +350,8 @@ static void psock_data_ready(struct sock *sk)
 {
 	struct kcm_psock *psock;
 
+	trace_sk_data_ready(sk);
+
 	read_lock_bh(&sk->sk_callback_lock);
 
 	psock = (struct kcm_psock *)sk->sk_user_data;

net/mptcp/subflow.c

@@ -26,6 +26,7 @@
 #include "mib.h"
 
 #include <trace/events/mptcp.h>
+#include <trace/events/sock.h>
 
 static void mptcp_subflow_ops_undo_override(struct sock *ssk);
 
@@ -1438,6 +1439,8 @@ static void subflow_data_ready(struct sock *sk)
 	struct sock *parent = subflow->conn;
 	struct mptcp_sock *msk;
 
+	trace_sk_data_ready(sk);
+
 	msk = mptcp_sk(parent);
 	if (state & TCPF_LISTEN) {
 		/* MPJ subflow are removed from accept queue before reaching here,

net/phonet/pep-gprs.c

@@ -19,6 +19,8 @@
 #include <net/tcp_states.h>
 #include <net/phonet/gprs.h>
 
+#include <trace/events/sock.h>
+
 #define GPRS_DEFAULT_MTU 1400
 
 struct gprs_dev {
@@ -138,6 +140,8 @@ static void gprs_data_ready(struct sock *sk)
 	struct gprs_dev *gp = sk->sk_user_data;
 	struct sk_buff *skb;
 
+	trace_sk_data_ready(sk);
+
 	while ((skb = pep_read(sk)) != NULL) {
 		skb_orphan(skb);
 		gprs_recv(gp, skb);