trace: events: add a few neigh tracepoints

The goal here is to trace neigh state changes covering all possible
neigh update paths. Plus have a specific trace point in neigh_update
to cover flags sent to neigh_update.
Signed-off-by: NRoopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/trace/events/neigh.h

+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM neigh
+
+#if !defined(_TRACE_NEIGH_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_NEIGH_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/tracepoint.h>
+#include <net/neighbour.h>
+
+#define neigh_state_str(state)				\
+	__print_symbolic(state,				\
+		{ NUD_INCOMPLETE, "incomplete" },	\
+		{ NUD_REACHABLE, "reachable" },		\
+		{ NUD_STALE, "stale" },			\
+		{ NUD_DELAY, "delay" },			\
+		{ NUD_PROBE, "probe" },			\
+		{ NUD_FAILED, "failed" })
+
+TRACE_EVENT(neigh_update,
+
+	TP_PROTO(struct neighbour *n, const u8 *lladdr, u8 new,
+		 u32 flags, u32 nlmsg_pid),
+
+	TP_ARGS(n, lladdr, new, flags, nlmsg_pid),
+
+	TP_STRUCT__entry(
+		__field(u32, family)
+		__string(dev, (n->dev ? n->dev->name : "NULL"))
+		__array(u8, lladdr, MAX_ADDR_LEN)
+		__field(u8, lladdr_len)
+		__field(u8, flags)
+		__field(u8, nud_state)
+		__field(u8, type)
+		__field(u8, dead)
+		__field(int, refcnt)
+		__array(__u8, primary_key4, 4)
+		__array(__u8, primary_key6, 16)
+		__field(unsigned long, confirmed)
+		__field(unsigned long, updated)
+		__field(unsigned long, used)
+		__array(u8, new_lladdr, MAX_ADDR_LEN)
+		__field(u8, new_state)
+		__field(u32, update_flags)
+		__field(u32, pid)
+	),
+
+	TP_fast_assign(
+		int lladdr_len = (n->dev ? n->dev->addr_len : MAX_ADDR_LEN);
+		struct in6_addr *pin6;
+		__be32 *p32;
+
+		__entry->family = n->tbl->family;
+		__assign_str(dev, (n->dev ? n->dev->name : "NULL"));
+		__entry->lladdr_len = lladdr_len;
+		memcpy(__entry->lladdr, n->ha, lladdr_len);
+		__entry->flags = n->flags;
+		__entry->nud_state = n->nud_state;
+		__entry->type = n->type;
+		__entry->dead = n->dead;
+		__entry->refcnt = refcount_read(&n->refcnt);
+		pin6 = (struct in6_addr *)__entry->primary_key6;
+		p32 = (__be32 *)__entry->primary_key4;
+
+		if (n->tbl->family == AF_INET)
+			*p32 = *(__be32 *)n->primary_key;
+		else
+			*p32 = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (n->tbl->family == AF_INET6) {
+			pin6 = (struct in6_addr *)__entry->primary_key6;
+			*pin6 = *(struct in6_addr *)n->primary_key;
+		} else
+#endif
+		{
+			ipv6_addr_set_v4mapped(*p32, pin6);
+		}
+		__entry->confirmed = n->confirmed;
+		__entry->updated = n->updated;
+		__entry->used = n->used;
+		if (lladdr)
+			memcpy(__entry->new_lladdr, lladdr, lladdr_len);
+		__entry->new_state = new;
+		__entry->update_flags = flags;
+		__entry->pid = nlmsg_pid;
+	),
+
+	TP_printk("family %d dev %s lladdr %s flags %02x nud_state %s type %02x "
+		  "dead %d refcnt %d primary_key4 %pI4 primary_key6 %pI6c "
+		  "confirmed %lu updated %lu used %lu new_lladdr %s "
+		  "new_state %02x update_flags %02x pid %d",
+		  __entry->family, __get_str(dev),
+		  __print_hex_str(__entry->lladdr, __entry->lladdr_len),
+		  __entry->flags, neigh_state_str(__entry->nud_state),
+		  __entry->type, __entry->dead, __entry->refcnt,
+		  __entry->primary_key4, __entry->primary_key6,
+		  __entry->confirmed, __entry->updated, __entry->used,
+		  __print_hex_str(__entry->new_lladdr, __entry->lladdr_len),
+		  __entry->new_state,
+		  __entry->update_flags, __entry->pid)
+);
+
+DECLARE_EVENT_CLASS(neigh__update,
+	TP_PROTO(struct neighbour *n, int err),
+	TP_ARGS(n, err),
+	TP_STRUCT__entry(
+		__field(u32, family)
+		__string(dev, (n->dev ? n->dev->name : "NULL"))
+		__array(u8, lladdr, MAX_ADDR_LEN)
+		__field(u8, lladdr_len)
+		__field(u8, flags)
+		__field(u8, nud_state)
+		__field(u8, type)
+		__field(u8, dead)
+		__field(int, refcnt)
+		__array(__u8, primary_key4, 4)
+		__array(__u8, primary_key6, 16)
+		__field(unsigned long, confirmed)
+		__field(unsigned long, updated)
+		__field(unsigned long, used)
+		__field(u32, err)
+	),
+
+	TP_fast_assign(
+		int lladdr_len = (n->dev ? n->dev->addr_len : MAX_ADDR_LEN);
+		struct in6_addr *pin6;
+		__be32 *p32;
+
+		__entry->family = n->tbl->family;
+		__assign_str(dev, (n->dev ? n->dev->name : "NULL"));
+		__entry->lladdr_len = lladdr_len;
+		memcpy(__entry->lladdr, n->ha, lladdr_len);
+		__entry->flags = n->flags;
+		__entry->nud_state = n->nud_state;
+		__entry->type = n->type;
+		__entry->dead = n->dead;
+		__entry->refcnt = refcount_read(&n->refcnt);
+		pin6 = (struct in6_addr *)__entry->primary_key6;
+		p32 = (__be32 *)__entry->primary_key4;
+
+		if (n->tbl->family == AF_INET)
+			*p32 = *(__be32 *)n->primary_key;
+		else
+			*p32 = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (n->tbl->family == AF_INET6) {
+			pin6 = (struct in6_addr *)__entry->primary_key6;
+			*pin6 = *(struct in6_addr *)n->primary_key;
+		} else
+#endif
+		{
+			ipv6_addr_set_v4mapped(*p32, pin6);
+		}
+
+		__entry->confirmed = n->confirmed;
+		__entry->updated = n->updated;
+		__entry->used = n->used;
+		__entry->err = err;
+	),
+
+	TP_printk("family %d dev %s lladdr %s flags %02x nud_state %s type %02x "
+		  "dead %d refcnt %d primary_key4 %pI4 primary_key6 %pI6c "
+		  "confirmed %lu updated %lu used %lu err %d",
+		  __entry->family, __get_str(dev),
+		  __print_hex_str(__entry->lladdr, __entry->lladdr_len),
+		  __entry->flags, neigh_state_str(__entry->nud_state),
+		  __entry->type, __entry->dead, __entry->refcnt,
+		  __entry->primary_key4, __entry->primary_key6,
+		  __entry->confirmed, __entry->updated, __entry->used,
+		  __entry->err)
+);
+
+DEFINE_EVENT(neigh__update, neigh_update_done,
+	TP_PROTO(struct neighbour *neigh, int err),
+	TP_ARGS(neigh, err)
+);
+
+DEFINE_EVENT(neigh__update, neigh_timer_handler,
+	TP_PROTO(struct neighbour *neigh, int err),
+	TP_ARGS(neigh, err)
+);
+
+DEFINE_EVENT(neigh__update, neigh_event_send_done,
+	TP_PROTO(struct neighbour *neigh, int err),
+	TP_ARGS(neigh, err)
+);
+
+DEFINE_EVENT(neigh__update, neigh_event_send_dead,
+	TP_PROTO(struct neighbour *neigh, int err),
+	TP_ARGS(neigh, err)
+);
+
+DEFINE_EVENT(neigh__update, neigh_cleanup_and_release,
+	TP_PROTO(struct neighbour *neigh, int rc),
+	TP_ARGS(neigh, rc)
+);
+
+#endif /* _TRACE_NEIGH_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

net/core/net-traces.c

@@ -43,6 +43,14 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(fdb_delete);
 EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_update);
 #endif
 
+#include <trace/events/neigh.h>
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_update);
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_update_done);
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_timer_handler);
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_event_send_done);
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_event_send_dead);
+EXPORT_TRACEPOINT_SYMBOL_GPL(neigh_cleanup_and_release);
+
 EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(napi_poll);