[pxe] Profile UNDI transmit datapath

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/interface/pxe/pxe_undi.c

 #include <ipxe/ip.h>
 #include <ipxe/arp.h>
 #include <ipxe/rarp.h>
+#include <ipxe/profile.h>
 #include "pxe.h"
 
 /**
 
 struct net_device *pxe_netdev = NULL;
 
+/** Transmit profiler */
+static struct profiler undi_tx_profiler __profiler = { .name = "undi.tx" };
+
 /**
  * Set network device as current PXE network device
  *
 	unsigned int i;
 	int rc;
 
+	/* Start profiling */
+	profile_start ( &undi_tx_profiler );
+
 	/* Sanity check */
 	if ( ! pxe_netdev ) {
 		DBGC ( &pxe_netdev, "PXENV_UNDI_TRANSMIT called with no "
 		return PXENV_EXIT_FAILURE;
 	}
 
+	profile_stop ( &undi_tx_profiler );
 	undi_transmit->Status = PXENV_STATUS_SUCCESS;
 	return PXENV_EXIT_SUCCESS;
 }