Index: if_vmx.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_vmx.c,v
retrieving revision 1.70
diff -u -p -r1.70 if_vmx.c
--- if_vmx.c	11 Sep 2022 08:38:39 -0000	1.70
+++ if_vmx.c	28 Jul 2023 13:00:33 -0000
@@ -48,8 +48,8 @@
 
 #define VMX_MAX_QUEUES	MIN(VMXNET3_MAX_TX_QUEUES, VMXNET3_MAX_RX_QUEUES)
 
-#define NTXDESC 512 /* tx ring size */
-#define NTXSEGS 8 /* tx descriptors per packet */
+#define NTXDESC 128			/* tx ring size */
+#define NTXSEGS 8			/* tx descriptors per packet */
 #define NRXDESC 512
 #define NTXCOMPDESC NTXDESC
 #define NRXCOMPDESC (NRXDESC * 2)	/* ring1 + ring2 */
@@ -924,18 +924,20 @@ vmxnet3_txintr(struct vmxnet3_softc *sc,
 	struct vmxnet3_txcompdesc *txcd;
 	bus_dmamap_t map;
 	struct mbuf *m;
-	u_int cons, next;
+	u_int prod, cons, next;
 	uint32_t rgen;
 
+	prod = ring->prod;
 	cons = ring->cons;
-	if (cons == ring->prod)
+
+	if (cons == prod)
 		return;
 
 	next = comp_ring->next;
 	rgen = comp_ring->gen;
 
 	/* postread */
-	for (;;) {
+	do {
 		txcd = &comp_ring->txcd[next];
 		if ((txcd->txc_word3 & VMX_TXC_GEN) != rgen)
 			break;
@@ -951,6 +953,8 @@ vmxnet3_txintr(struct vmxnet3_softc *sc,
 		KASSERT(m != NULL);
 
 		map = ring->dmap[cons];
+		bus_dmamap_sync(sc->sc_dmat, map, 0, map->dm_mapsize,
+		    BUS_DMASYNC_POSTWRITE);
 		bus_dmamap_unload(sc->sc_dmat, map);
 		m_freem(m);
 
@@ -958,7 +962,7 @@ vmxnet3_txintr(struct vmxnet3_softc *sc,
 		    VMXNET3_TXC_EOPIDX_M;
 		cons++;
 		cons %= NTXDESC;
-	}
+	} while (cons != prod);
 	/* preread */
 
 	comp_ring->next = next;