QEMU network probes

[Rayson Ho <rho at redhat dot com>]

Please review the probe addition in QEMU for the network module, note
that I added probes for send & receive Ethernet frames for rtl8139 so
far but not other network devices. Also for receive, the probe would
only fire when a frame is successfully received, so any errors are
ignored.

=========================================================================

diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index a22530c..df04f59 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -53,6 +53,7 @@
 #include "net.h"
 #include "loader.h"
 #include "sysemu.h"
+#include "trace.h"
 
 /* debug RTL8139 card */
 //#define DEBUG_RTL8139 1
@@ -1160,6 +1161,8 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
         rtl8139_update_irq(s);
     }
 
+    trace_rtl8139_do_receive(nc, buf, size_, do_interrupt);
+
     return size_;
 }
 
@@ -1742,6 +1745,8 @@ static uint32_t rtl8139_RxConfig_read(RTL8139State *s)
 
 static void rtl8139_transfer_frame(RTL8139State *s, const uint8_t *buf, int size, int do_interrupt)
 {
+    trace_rtl8139_transfer_frame(s, buf, size, do_interrupt);
+    
     if (!size)
     {
         DEBUG_PRINT(("RTL8139: +++ empty ethernet frame\n"));
diff --git a/net.c b/net.c
index 9ba5be2..ba74f74 100644
--- a/net.c
+++ b/net.c
@@ -36,6 +36,7 @@
 #include "qemu-common.h"
 #include "qemu_socket.h"
 #include "hw/qdev.h"
+#include "trace.h"
 
 static QTAILQ_HEAD(, VLANState) vlans;
 static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
@@ -559,6 +560,7 @@ ssize_t qemu_send_packet_async(VLANClientState *sender,
 
 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
 {
+    trace_qemu_send_packet(vc, buf, size);
     qemu_send_packet_async(vc, buf, size, NULL);
 }
 
diff --git a/trace-events b/trace-events
index e6138ea..76a8431 100644
--- a/trace-events
+++ b/trace-events
@@ -254,3 +254,10 @@ disable spice_vmc_write(ssize_t out, int len) "spice wrottn %lu of requested %zd
 disable spice_vmc_read(int bytes, int len) "spice read %lu of requested %zd"
 disable spice_vmc_register_interface(void *scd) "spice vmc registered interface %p"
 disable spice_vmc_unregister_interface(void *scd) "spice vmc unregistered interface %p"
+
+# net.c
+disable qemu_send_packet(void *vc, const uint8_t *buf, int size) "client-state: %p, buf %p size %d"
+
+#hw/rtl8139.c
+disable rtl8139_transfer_frame(void *s, const uint8_t *buf, int size, int do_interrupt) "RTL8139State %p, buf %p size %d do_interrupt %d"
+disable rtl8139_do_receive(void *s, const uint8_t *buf, int size, int do_interrupt) "client-state: %p, buf %p size %zu do_interrupt %d"

=========================================================================

Signed-off-by: Rayson Ho <rho@redhat.com>

Rayson



On Wed, 2010-11-24 at 20:56 +0000, Stefan Hajnoczi wrote:
> On Wed, Nov 24, 2010 at 7:22 PM, Rayson Ho <rho@redhat.com> wrote:
> > I added a probe point for a conference demo, are you interested in
> > adding it in?
> >  void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int
> > size)
> >  {
> > +     trace_qemu_send_packet(buf, size);
> >      qemu_send_packet_async(vc, buf, size, NULL);
> >  }
> 
> Cool, I recently talked to Prerna Saxena about improving tracing
> coverage.  The net subsystem is one of the areas where we need to add
> trace events.
> 
> Please include the VLANClientState *vc pointer in the trace so sent
> packets can be correlated to their network clients.
> 
> Want to send a patch to qemu-devel?
> 
> Stefan