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Commit 365a1028 authored by Sowmini Varadhan's avatar Sowmini Varadhan Committed by David S. Miller
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sunvnet: perf tracepoint invocations to trace LDC state machine 



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

Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 46fcc6ef

drivers/net/ethernet/sun/sunvnet.c

+22 −2
Original line number Diff line number Diff line
@@ -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)) {