Index: if_rge.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_rge.c,v
retrieving revision 1.21
diff -u -p -r1.21 if_rge.c
--- if_rge.c	21 Dec 2022 02:31:09 -0000	1.21
+++ if_rge.c	2 Apr 2023 21:24:27 -0000
@@ -29,6 +29,7 @@
 #include <sys/socket.h>
 #include <sys/device.h>
 #include <sys/endian.h>
+#include <sys/atomic.h>
 
 #include <net/if.h>
 #include <net/if_media.h>
@@ -493,19 +494,15 @@ rge_encap(struct rge_queues *q, struct m
 	/* Set EOF on the last descriptor. */
 	d->rge_cmdsts |= htole32(RGE_TDCMDSTS_EOF);
 
-	/* Transfer ownership of packet to the chip. */
-	d = &q->q_tx.rge_tx_list[idx];
-
-	d->rge_cmdsts |= htole32(RGE_TDCMDSTS_OWN);
-
-	bus_dmamap_sync(sc->sc_dmat, q->q_tx.rge_tx_list_map,
-	    cur * sizeof(struct rge_tx_desc), sizeof(struct rge_tx_desc),
-	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
-
 	/* Update info of TX queue and descriptors. */
 	txq->txq_mbuf = m;
 	txq->txq_descidx = last;
 
+	/* Transfer ownership of packet to the chip. */
+	membar_producer();
+	d = &q->q_tx.rge_tx_list[idx];
+	d->rge_cmdsts |= htole32(RGE_TDCMDSTS_OWN);
+
 	return (nsegs);
 }
 
@@ -579,6 +576,10 @@ rge_start(struct ifqueue *ifq)
 		free += RGE_TX_LIST_CNT;
 	free -= idx;
 
+	bus_dmamap_sync(sc->sc_dmat, q->q_tx.rge_tx_list_map,
+	    0, sizeof(struct rge_tx_desc) * RGE_TX_LIST_CNT,
+	    BUS_DMASYNC_POSTWRITE);
+
 	for (;;) {
 		if (RGE_TX_NSEGS >= free + 2) {
 			ifq_set_oactive(&ifp->if_snd);
@@ -610,6 +611,10 @@ rge_start(struct ifqueue *ifq)
 		queued++;
 	}
 
+	bus_dmamap_sync(sc->sc_dmat, q->q_tx.rge_tx_list_map,
+	    0, sizeof(struct rge_tx_desc) * RGE_TX_LIST_CNT,
+	    BUS_DMASYNC_PREWRITE);
+
 	if (queued == 0)
 		return;
 
@@ -1320,6 +1325,10 @@ rge_txeof(struct rge_queues *q)
 	prod = q->q_tx.rge_txq_prodidx;
 	cons = q->q_tx.rge_txq_considx;
 
+	bus_dmamap_sync(sc->sc_dmat, q->q_tx.rge_tx_list_map,
+	    0, sizeof(struct rge_tx_desc) * RGE_TX_LIST_CNT,
+	    BUS_DMASYNC_POSTREAD);
+
 	while (prod != cons) {
 		txq = &q->q_tx.rge_txq[cons];
 		idx = txq->txq_descidx;
@@ -1355,6 +1364,10 @@ rge_txeof(struct rge_queues *q)
 		cons = RGE_NEXT_TX_DESC(idx);
 		free = 1;
 	}
+
+	bus_dmamap_sync(sc->sc_dmat, q->q_tx.rge_tx_list_map,
+	    0, sizeof(struct rge_tx_desc) * RGE_TX_LIST_CNT,
+	    BUS_DMASYNC_PREREAD);
 
 	if (free == 0)
 		return (0);