Add trace points to simplify debugging migration.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 net/tap.c        | 10 ++++++++++
 net/trace-events |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/net/tap.c b/net/tap.c
index 2530627a9a..151fb73820 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -43,6 +43,7 @@
 #include "qemu/main-loop.h"
 #include "qemu/sockets.h"
 #include "hw/virtio/vhost.h"
+#include "trace.h"
 
 #include "net/tap.h"
 
@@ -148,6 +149,9 @@ static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
     g_autofree struct iovec *iov_copy = NULL;
     struct virtio_net_hdr hdr = { };
 
+    trace_tap_receive_iov(s->using_vnet_hdr, s->host_vnet_hdr_len, iovcnt,
+                          iov->iov_len);
+
     if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
         iov_copy = g_new(struct iovec, iovcnt + 1);
         iov_copy[0].iov_base = &hdr;
@@ -199,6 +203,8 @@ static void tap_send(void *opaque)
             break;
         }
 
+        trace_tap_send_packet(s->using_vnet_hdr, s->host_vnet_hdr_len, size);
+
         if (s->host_vnet_hdr_len && size <= s->host_vnet_hdr_len) {
             /* Invalid packet */
             break;
@@ -980,6 +986,8 @@ int tap_enable(NetClientState *nc)
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
     int ret;
 
+    trace_tap_enable();
+
     if (s->enabled) {
         return 0;
     } else {
@@ -997,6 +1005,8 @@ int tap_disable(NetClientState *nc)
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
     int ret;
 
+    trace_tap_disable();
+
     if (s->enabled == 0) {
         return 0;
     } else {
diff --git a/net/trace-events b/net/trace-events
index cda960f42b..a8921763ab 100644
--- a/net/trace-events
+++ b/net/trace-events
@@ -29,3 +29,9 @@ vhost_vdpa_set_address_space_id(void *v, unsigned vq_group, unsigned asid_num) "
 vhost_vdpa_net_load_cmd(void *s, uint8_t class, uint8_t cmd, int data_num, int data_size) "vdpa state: %p class: %u cmd: %u sg_num: %d size: %d"
 vhost_vdpa_net_load_cmd_retval(void *s, uint8_t class, uint8_t cmd, int r) "vdpa state: %p class: %u cmd: %u retval: %d"
 vhost_vdpa_net_load_mq(void *s, int ncurqps) "vdpa state: %p current_qpairs: %d"
+
+# tap.c
+tap_receive_iov(bool using_vnet_hdr, uint32_t host_vnet_hdr_len, int iovcnt, size_t iov_len) "using_vnet_hdr:%d host_vnet_hdr_len:%u iovcnt:%d iov_len:%zu"
+tap_send_packet(bool using_vnet_hdr, uint32_t host_vnet_hdr_len, int size) "using_vnet_hdr:%d host_vnet_hdr_len:%u size:%d"
+tap_enable(void) ""
+tap_disable(void) ""
-- 
2.48.1