Also set TSO flag on vlan interfaces.

with tweaks from bluhm, claudio and dlg

I fine with it from claudio
looks good to me from dlg

ok bluhm

3 files changed, 40 insertions, 3 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index e06e8e8b769..58db412810d 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.c,v 1.692 2023/04/22 04:39:46 dlg Exp $	*/
+/*	$OpenBSD: if.c,v 1.693 2023/04/26 00:14:21 jan Exp $	*/
 /*	$NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $	*/
 
 /*
@@ -95,6 +95,11 @@
 #include <net/route.h>
 #include <net/netisr.h>
 
+#include "vlan.h"
+#if NVLAN > 0
+#include <net/if_vlan_var.h>
+#endif
+
 #include <netinet/in.h>
 #include <netinet/if_ether.h>
 #include <netinet/igmp.h>
@@ -3149,6 +3154,12 @@ ifsettso(struct ifnet *ifp, int on)
 	else
 		goto out;
 
+#if NVLAN > 0
+	/* Change TSO flag also on attached vlan(4) interfaces. */
+	vlan_flags_from_parent(ifp, IFXF_TSO);
+#endif
+
+	/* restart interface */
 	if (ISSET(ifp->if_flags, IFF_UP)) {
 		/* go down for a moment... */
 		CLR(ifp->if_flags, IFF_UP);
diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 8958233348b..86bb5a757c9 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_vlan.c,v 1.213 2023/04/22 04:39:46 dlg Exp $	*/
+/*	$OpenBSD: if_vlan.c,v 1.214 2023/04/26 00:14:21 jan Exp $	*/
 
 /*
  * Copyright 1998 Massachusetts Institute of Technology
@@ -560,6 +560,9 @@ vlan_up(struct vlan_softc *sc)
 	/* configure the parent to handle packets for this vlan */
 	vlan_multi_apply(sc, ifp0, SIOCADDMULTI);
 
+	/* Inherit flags from parent interface. */
+	vlan_flags_from_parent(ifp0, IFXF_TSO);
+
 	/* we're running now */
 	SET(ifp->if_flags, IFF_RUNNING);
 	vlan_link_state(sc, ifp0->if_link_state, ifp0->if_baudrate);
@@ -962,6 +965,28 @@ vlan_del_parent(struct vlan_softc *sc)
 	return (0);
 }
 
+void
+vlan_flags_from_parent(struct ifnet *ifp0, int flags)
+{
+	struct vlan_softc *sc;
+	int i;
+
+	for (i = 0; i < TAG_HASH_SIZE; i++) {
+		SMR_SLIST_FOREACH_LOCKED(sc, &vlan_tagh[i], sc_list) {
+			/* vlan and tso only works with hw tagging */
+			if (!ISSET(ifp0->if_capabilities, IFCAP_VLAN_HWTAGGING))
+				CLR(flags, IFXF_TSO);
+
+			if (sc->sc_ifidx0 == ifp0->if_index) {
+				if (ISSET(ifp0->if_xflags, flags))
+					SET(sc->sc_if.if_xflags, flags);
+				else
+					CLR(sc->sc_if.if_xflags, flags);
+			}
+		}
+	}
+}
+
 int
 vlan_set_compat(struct ifnet *ifp, struct ifreq *ifr)
 {
diff --git a/sys/net/if_vlan_var.h b/sys/net/if_vlan_var.h
index 9e408cd71ef..df51cc186f0 100644
--- a/sys/net/if_vlan_var.h
+++ b/sys/net/if_vlan_var.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_vlan_var.h,v 1.45 2023/04/22 04:39:46 dlg Exp $	*/
+/*	$OpenBSD: if_vlan_var.h,v 1.46 2023/04/26 00:14:21 jan Exp $	*/
 
 /*
  * Copyright 1998 Massachusetts Institute of Technology
@@ -49,6 +49,7 @@ struct	vlanreq {
 #ifdef _KERNEL
 struct mbuf	*vlan_input(struct ifnet *, struct mbuf *, unsigned int *);
 struct mbuf	*vlan_inject(struct mbuf *, uint16_t, uint16_t);
+void		 vlan_flags_from_parent(struct ifnet *, int);
 #endif /* _KERNEL */
 
 #endif /* _NET_IF_VLAN_VAR_H_ */