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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: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2016-02-02 10:41:56 -08:00 committed by David S. Miller
parent 46fcc6ef9d
commit 365a10289f
1 changed files with 22 additions and 2 deletions
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24
drivers/net/ethernet/sun/sunvnet.c
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@ -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)) {