sunvnet: perf tracepoint invocations to trace LDC state machine

Use sunvnet perf trace macros to monitor LDC message exchange state.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 2 deletions

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 23fa29877f5b..942a95db2061 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -17,6 +17,8 @@
 #include <linux/mutex.h>
 #include <linux/highmem.h>
 #include <linux/if_vlan.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/sunvnet.h>
 
 #if IS_ENABLED(CONFIG_IPV6)
 #include <linux/icmpv6.h>
@@ -540,6 +542,8 @@ static int vnet_walk_rx_one(struct vnet_port *port,
         err = vnet_rx_one(port, desc);
         if (err == -ECONNRESET)
                 return err;
+        trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
+                          index, desc->hdr.ack);
         desc->hdr.state = VIO_DESC_DONE;
         err = put_rx_desc(port, dr, desc, index);
         if (err < 0)
@@ -587,9 +591,15 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
                 ack_start = ack_end = vio_dring_prev(dr, start);
         if (send_ack) {
                 port->napi_resume = false;
+                trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
+                                               port->vio._peer_sid,
+                                               ack_end, *npkts);
                 return vnet_send_ack(port, dr, ack_start, ack_end,
                                      VIO_DRING_STOPPED);
         } else  {
+                trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
+                                                port->vio._peer_sid,
+                                                ack_end, *npkts);
                 port->napi_resume = true;
                 port->napi_stop_idx = ack_end;
                 return 1;
@@ -663,6 +673,8 @@ static int vnet_ack(struct vnet_port *port, void *msgbuf)
         /* sync for race conditions with vnet_start_xmit() and tell xmit it
          * is time to send a trigger.
          */
+        trace_vnet_rx_stopped_ack(port->vio._local_sid,
+                                  port->vio._peer_sid, end);
         dr->cons = vio_dring_next(dr, end);
         desc = vio_dring_entry(dr, dr->cons);
         if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
@@ -886,6 +898,9 @@ static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
         int retries = 0;
 
         if (port->stop_rx) {
+                trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
+                                                  port->vio._peer_sid,
+                                                  port->stop_rx_idx, -1);
                 err = vnet_send_ack(port,
                                     &port->vio.drings[VIO_DRIVER_RX_RING],
                                     port->stop_rx_idx, -1,
@@ -908,6 +923,8 @@ static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
                 if (retries++ > VNET_MAX_RETRIES)
                         break;
         } while (err == -EAGAIN);
+        trace_vnet_tx_trigger(port->vio._local_sid,
+                              port->vio._peer_sid, start, err);
 
         return err;
 }
@@ -1414,8 +1431,11 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
          * producer to consumer announcement that work is available to the
          * consumer
          */
-        if (!port->start_cons)
-                goto ldc_start_done; /* previous trigger suffices */
+        if (!port->start_cons) { /* previous trigger suffices */
+                trace_vnet_skip_tx_trigger(port->vio._local_sid,
+                                           port->vio._peer_sid, dr->cons);
+                goto ldc_start_done;
+        }
 
         err = __vnet_tx_trigger(port, dr->cons);
         if (unlikely(err < 0)) {