[intel] Incorporate ring producer and consumer counters in diagnostics

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

src/drivers/net/intel.c

  */
 static void __attribute__ (( unused )) intel_diag ( struct intel_nic *intel ) {
 
-	DBGC ( intel, "INTEL %p TDH=%04x TDT=%04x RDH=%04x RDT=%04x\n", intel,
+	DBGC ( intel, "INTEL %p TX %04x(%02x)/%04x(%02x) "
+	       "RX %04x(%02x)/%04x(%02x)\n", intel,
+	       ( intel->tx.cons & 0xffff ),
 	       readl ( intel->regs + intel->tx.reg + INTEL_xDH ),
+	       ( intel->tx.prod & 0xffff ),
 	       readl ( intel->regs + intel->tx.reg + INTEL_xDT ),
+	       ( intel->rx.cons & 0xffff ),
 	       readl ( intel->regs + intel->rx.reg + INTEL_xDH ),
+	       ( intel->rx.prod & 0xffff ),
 	       readl ( intel->regs + intel->rx.reg + INTEL_xDT ) );
 }