tg3: Organize loopback test failure flags

As more test modes are added to each loopback mode, the need to
organise the results increases.  This patch groups the results by
loopback mode, and then by test mode.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -11276,10 +11276,12 @@ static int tg3_run_loopback(struct tg3 *tp, u32 pktsz, int loopback_mode)
 	return err;
 }
 
-#define TG3_MAC_LOOPBACK_FAILED		1
-#define TG3_PHY_LOOPBACK_FAILED		2
-#define TG3_LOOPBACK_FAILED		(TG3_MAC_LOOPBACK_FAILED |	\
-					 TG3_PHY_LOOPBACK_FAILED)
+#define TG3_STD_LOOPBACK_FAILED		1
+#define TG3_JMB_LOOPBACK_FAILED		2
+
+#define TG3_MAC_LOOPBACK_SHIFT		0
+#define TG3_PHY_LOOPBACK_SHIFT		4
+#define TG3_LOOPBACK_FAILED			0x00000033
 
 static int tg3_test_loopback(struct tg3 *tp)
 {
@@ -11338,11 +11340,11 @@ static int tg3_test_loopback(struct tg3 *tp)
 	}
 
 	if (tg3_run_loopback(tp, ETH_FRAME_LEN, TG3_MAC_LOOPBACK))
-		err |= TG3_MAC_LOOPBACK_FAILED;
+		err |= TG3_STD_LOOPBACK_FAILED << TG3_MAC_LOOPBACK_SHIFT;
 
 	if ((tp->tg3_flags & TG3_FLAG_JUMBO_RING_ENABLE) &&
 	    tg3_run_loopback(tp, 9000 + ETH_HLEN, TG3_MAC_LOOPBACK))
-		err |= (TG3_MAC_LOOPBACK_FAILED << 2);
+		err |= TG3_JMB_LOOPBACK_FAILED << TG3_MAC_LOOPBACK_SHIFT;
 
 	if (tp->tg3_flags & TG3_FLAG_CPMU_PRESENT) {
 		tw32(TG3_CPMU_CTRL, cpmuctrl);
@@ -11354,10 +11356,12 @@ static int tg3_test_loopback(struct tg3 *tp)
 	if (!(tp->phy_flags & TG3_PHYFLG_PHY_SERDES) &&
 	    !(tp->tg3_flags3 & TG3_FLG3_USE_PHYLIB)) {
 		if (tg3_run_loopback(tp, ETH_FRAME_LEN, TG3_PHY_LOOPBACK))
-			err |= TG3_PHY_LOOPBACK_FAILED;
+			err |= TG3_STD_LOOPBACK_FAILED <<
+			       TG3_PHY_LOOPBACK_SHIFT;
 		if ((tp->tg3_flags & TG3_FLAG_JUMBO_RING_ENABLE) &&
 		    tg3_run_loopback(tp, 9000 + ETH_HLEN, TG3_PHY_LOOPBACK))
-			err |= (TG3_PHY_LOOPBACK_FAILED << 2);
+			err |= TG3_JMB_LOOPBACK_FAILED <<
+			       TG3_PHY_LOOPBACK_SHIFT;
 	}
 
 	/* Re-enable gphy autopowerdown. */