[pxe] Improve pxe_udp debug messages

The PXE debugging messages have remained pretty much unaltered since
Etherboot 5.4, and are now difficult to read in comparison to most of
the rest of iPXE.

Bring the pxe_udp debug messages up to normal iPXE standards.

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

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

@@ -166,11 +166,13 @@ PXENV_EXIT_t pxenv_udp_open ( struct s_PXENV_UDP_OPEN *pxenv_udp_open ) {
 
 	/* Record source IP address */
 	pxe_udp.local.sin_addr.s_addr = pxenv_udp_open->src_ip;
-	DBG ( " %s", inet_ntoa ( pxe_udp.local.sin_addr ) );
+	DBG ( " %s\n", inet_ntoa ( pxe_udp.local.sin_addr ) );
 
 	/* Open promiscuous UDP connection */
 	intf_restart ( &pxe_udp.xfer, 0 );
 	if ( ( rc = udp_open_promisc ( &pxe_udp.xfer ) ) != 0 ) {
+		DBG ( "PXENV_UDP_OPEN could not open promiscuous socket: %s\n",
+		      strerror ( rc ) );
 		pxenv_udp_open->Status = PXENV_STATUS ( rc );
 		return PXENV_EXIT_FAILURE;
 	}
@@ -201,7 +203,7 @@ PXENV_EXIT_t pxenv_udp_open ( struct s_PXENV_UDP_OPEN *pxenv_udp_open ) {
  *
  */
 PXENV_EXIT_t pxenv_udp_close ( struct s_PXENV_UDP_CLOSE *pxenv_udp_close ) {
-	DBG ( "PXENV_UDP_CLOSE" );
+	DBG ( "PXENV_UDP_CLOSE\n" );
 
 	/* Close UDP connection */
 	intf_restart ( &pxe_udp.xfer, 0 );
@@ -288,6 +290,7 @@ PXENV_EXIT_t pxenv_udp_write ( struct s_PXENV_UDP_WRITE *pxenv_udp_write ) {
 	len = pxenv_udp_write->buffer_size;
 	iobuf = xfer_alloc_iob ( &pxe_udp.xfer, len );
 	if ( ! iobuf ) {
+		DBG ( " out of memory\n" );
 		pxenv_udp_write->Status = PXENV_STATUS_OUT_OF_RESOURCES;
 		return PXENV_EXIT_FAILURE;
 	}
@@ -295,7 +298,7 @@ PXENV_EXIT_t pxenv_udp_write ( struct s_PXENV_UDP_WRITE *pxenv_udp_write ) {
 				pxenv_udp_write->buffer.offset );
 	copy_from_user ( iob_put ( iobuf, len ), buffer, 0, len );
 
-	DBG ( " %04x:%04x+%x %d->%s:%d", pxenv_udp_write->buffer.segment,
+	DBG ( " %04x:%04x+%x %d->%s:%d\n", pxenv_udp_write->buffer.segment,
 	      pxenv_udp_write->buffer.offset, pxenv_udp_write->buffer_size,
 	      ntohs ( pxenv_udp_write->src_port ),
 	      inet_ntoa ( dest.sin_addr ),
@@ -303,6 +306,8 @@ PXENV_EXIT_t pxenv_udp_write ( struct s_PXENV_UDP_WRITE *pxenv_udp_write ) {
 	
 	/* Transmit packet */
 	if ( ( rc = xfer_deliver ( &pxe_udp.xfer, iobuf, &meta ) ) != 0 ) {
+		DBG ( "PXENV_UDP_WRITE could not transmit: %s\n",
+		      strerror ( rc ) );
 		pxenv_udp_write->Status = PXENV_STATUS ( rc );
 		return PXENV_EXIT_FAILURE;
 	}
@@ -360,36 +365,36 @@ PXENV_EXIT_t pxenv_udp_read ( struct s_PXENV_UDP_READ *pxenv_udp_read ) {
 	uint16_t d_port_wanted = pxenv_udp_read->d_port;
 	uint16_t d_port;
 
-	DBG ( "PXENV_UDP_READ" );
-
 	/* Try receiving a packet */
 	pxe_udp.pxenv_udp_read = pxenv_udp_read;
 	step();
 	if ( pxe_udp.pxenv_udp_read ) {
 		/* No packet received */
+		DBG2 ( "PXENV_UDP_READ\n" );
 		pxe_udp.pxenv_udp_read = NULL;
 		goto no_packet;
 	}
 	dest_ip.s_addr = pxenv_udp_read->dest_ip;
 	d_port = pxenv_udp_read->d_port;
+	DBG ( "PXENV_UDP_READ" );
 
 	/* Filter on destination address and/or port */
 	if ( dest_ip_wanted.s_addr &&
 	     ( dest_ip_wanted.s_addr != dest_ip.s_addr ) ) {
 		DBG ( " wrong IP %s", inet_ntoa ( dest_ip ) );
-		DBG ( " (wanted %s)", inet_ntoa ( dest_ip_wanted ) );
+		DBG ( " (wanted %s)\n", inet_ntoa ( dest_ip_wanted ) );
 		goto no_packet;
 	}
 	if ( d_port_wanted && ( d_port_wanted != d_port ) ) {
-		DBG ( " wrong port %d ", htons ( d_port ) );
-		DBG ( " (wanted %d)", htons ( d_port_wanted ) );
+		DBG ( " wrong port %d", htons ( d_port ) );
+		DBG ( " (wanted %d)\n", htons ( d_port_wanted ) );
 		goto no_packet;
 	}
 
 	DBG ( " %04x:%04x+%x %s:", pxenv_udp_read->buffer.segment,
 	      pxenv_udp_read->buffer.offset, pxenv_udp_read->buffer_size,
 	      inet_ntoa ( *( ( struct in_addr * ) &pxenv_udp_read->src_ip ) ));
-	DBG ( "%d<-%s:%d",  ntohs ( pxenv_udp_read->s_port ),
+	DBG ( "%d<-%s:%d\n",  ntohs ( pxenv_udp_read->s_port ),
 	      inet_ntoa ( *( ( struct in_addr * ) &pxenv_udp_read->dest_ip ) ),
 	      ntohs ( pxenv_udp_read->d_port ) );