Change xl_rxeof() a bit to return the number of processed frames in

RX descriptor ring. Previously it returned the number of frames
that were successfully passed to upper stack which in turn means it
ignored frames that were discarded due to errors. The number of
processed frames in RX descriptor ring is used to detect whether
driver is out of sync with controller's current descriptor pointer.
Returning number of processed frames reduces unnecessary (probably
wrong) re-synchronization.

While here, remove unnecessary local variable initialization.

1 files changed, 3 insertions, 7 deletions

diff --git a/sys/dev/xl/if_xl.c b/sys/dev/xl/if_xl.c
index 15438a5..e9384f8 100644
--- a/sys/dev/xl/if_xl.c
+++ b/sys/dev/xl/if_xl.c
@@ -1944,7 +1944,7 @@ xl_rxeof(struct xl_softc *sc)
 	struct mbuf		*m;
 	struct ifnet		*ifp = sc->xl_ifp;
 	struct xl_chain_onefrag	*cur_rx;
-	int			total_len = 0;
+	int			total_len;
 	int			rx_npkts = 0;
 	u_int32_t		rxstat;
 
@@ -1963,6 +1963,7 @@ again:
 		cur_rx = sc->xl_cdata.xl_rx_head;
 		sc->xl_cdata.xl_rx_head = cur_rx->xl_next;
 		total_len = rxstat & XL_RXSTAT_LENMASK;
+		rx_npkts++;
 
 		/*
 		 * Since we have told the chip to allow large frames,
@@ -2047,7 +2048,6 @@ again:
 		XL_UNLOCK(sc);
 		(*ifp->if_input)(ifp, m);
 		XL_LOCK(sc);
-		rx_npkts++;
 
 		/*
 		 * If we are running from the taskqueue, the interface
@@ -2283,11 +2283,7 @@ xl_intr(void *arg)
 			break;
 
 		if (status & XL_STAT_UP_COMPLETE) {
-			int	curpkts;
-
-			curpkts = ifp->if_ipackets;
-			xl_rxeof(sc);
-			if (curpkts == ifp->if_ipackets) {
+			if (xl_rxeof(sc) == 0) {
 				while (xl_rx_resync(sc))
 					xl_rxeof(sc);
 			}