Partially revert r199035.

Revision 1.158 says only lower ten bits of
BGE_RXLP_LOCSTAT_IFIN_DROPS register is valid. For BCM5761 case it
seems the controller maintains 16bits value for the register.
However 16bits are still too small to count all dropped packets
happened in a second. To get a correct counter we have to read the
register in bge_rxeof() which would be too expensive.

Pointed out by:	bde

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/bge/if_bge.c b/sys/dev/bge/if_bge.c
index f2352a9..c0ef5dc 100644
--- a/sys/dev/bge/if_bge.c
+++ b/sys/dev/bge/if_bge.c
@@ -3289,6 +3289,14 @@ bge_rxeof(struct bge_softc *sc)
 		bge_writembx(sc, BGE_MBX_RX_STD_PROD_LO, sc->bge_std);
 	if (jumbocnt)
 		bge_writembx(sc, BGE_MBX_RX_JUMBO_PROD_LO, sc->bge_jumbo);
+#ifdef notyet
+	/*
+	 * This register wraps very quickly under heavy packet drops.
+	 * If you need correct statistics, you can enable this check.
+	 */
+	if (BGE_IS_5705_PLUS(sc))
+		ifp->if_ierrors += CSR_READ_4(sc, BGE_RXLP_LOCSTAT_IFIN_DROPS);
+#endif
 	return (rx_npkts);
 }