From f8dd9c11165f53f7fea9d09c39605c5a6b11d37d Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Sat, 13 Apr 2002 21:33:33 +0000
Subject: [PATCH] If the receiver runs out of space for an received frame in
 the internal FIFO or the in-RAM descriptors it will switch to RX_IDLE from
 where it is not restarted.

We used to deal with RX_IDLE by doing a total reinit but this lost
our link and caused a potential 30sec autonegotiation against
switches.  This was changed to a less heavyhanded approach, but this
failed to restart the receiver it it were in the RX_IDLE state.

This change adds the RX_IDLE and the RX_FIFO_OFLOW conditions as
triggers for interrupts and receive side processing, and restarts
the receiver when it is RX_IDLE.

Remove the #ifdef notyet'ed nge_rxeoc() function.

Sponsored by:	Cybercity Internet, Denmark.
MFC after:	7 days
---
 sys/dev/nge/if_nge.c    | 27 ++++++---------------------
 sys/dev/nge/if_ngereg.h |  3 ++-
 2 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/sys/dev/nge/if_nge.c b/sys/dev/nge/if_nge.c
index 32b1752aea5d..77b00347a73f 100644
--- a/sys/dev/nge/if_nge.c
+++ b/sys/dev/nge/if_nge.c
@@ -160,9 +160,6 @@ static int nge_newbuf		(struct nge_softc *,
 static int nge_encap		(struct nge_softc *,
 					struct mbuf *, u_int32_t *);
 static void nge_rxeof		(struct nge_softc *);
-#ifdef notdef
-static void nge_rxeoc		(struct nge_softc *);
-#endif
 static void nge_txeof		(struct nge_softc *);
 static void nge_intr		(void *);
 static void nge_tick		(void *);
@@ -1348,20 +1345,6 @@ static void nge_rxeof(sc)
 	return;
 }
 
-#ifdef notdef
-void nge_rxeoc(sc)
-	struct nge_softc	*sc;
-{
-	struct ifnet		*ifp;
-
-	ifp = &sc->arpcom.ac_if;
-	nge_rxeof(sc);
-	ifp->if_flags &= ~IFF_RUNNING;
-	nge_init(sc);
-	return;
-}
-#endif
-
 /*
  * A frame was downloaded to the chip. It's safe for us to clean up
  * the list buffers.
@@ -1496,12 +1479,14 @@ static void nge_intr(arg)
 		if ((status & NGE_ISR_RX_DESC_OK) ||
 		    (status & NGE_ISR_RX_ERR) ||
 		    (status & NGE_ISR_RX_OFLOW) ||
+		    (status & NGE_ISR_RX_FIFO_OFLOW) ||
+		    (status & NGE_ISR_RX_IDLE) ||
 		    (status & NGE_ISR_RX_OK))
 			nge_rxeof(sc);
-#ifdef notdef
-		if ((status & NGE_ISR_RX_OFLOW))
-			nge_rxeoc(sc);
-#endif
+
+		if ((status & NGE_ISR_RX_IDLE))
+			NGE_SETBIT(sc, NGE_CSR, NGE_CSR_RX_ENABLE);
+
 		if (status & NGE_ISR_SYSERR) {
 			nge_reset(sc);
 			ifp->if_flags &= ~IFF_RUNNING;
diff --git a/sys/dev/nge/if_ngereg.h b/sys/dev/nge/if_ngereg.h
index f10590e2c883..e5292457dc74 100644
--- a/sys/dev/nge/if_ngereg.h
+++ b/sys/dev/nge/if_ngereg.h
@@ -226,7 +226,8 @@
 #define NGE_INTRS	\
 	(NGE_IMR_RX_OFLOW|NGE_IMR_TX_UFLOW|NGE_IMR_TX_OK|\
 	 NGE_IMR_TX_IDLE|NGE_IMR_RX_OK|NGE_IMR_RX_ERR|\
-	 NGE_IMR_SYSERR|NGE_IMR_PHY_INTR)
+	 NGE_IMR_SYSERR|NGE_IMR_PHY_INTR|\
+	 NGE_IMR_RX_IDLE|NGE_IMR_RX_FIFO_OFLOW)
 
 /* Interrupt enable register */
 #define NGE_IER_INTRENB		0x00000001