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diff --git a/share/man/man4/vtnet.4 b/share/man/man4/vtnet.4
--- a/share/man/man4/vtnet.4
+++ b/share/man/man4/vtnet.4
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd September 30, 2025
+.Dd December 18, 2025
.Dt VTNET 4
.Os
.Sh NAME
@@ -271,6 +271,8 @@
The number of requested virtqueue pairs.
.It Va dev.vtnet. Ns Ar X Ns Va .max_vq_pairs
The maximum number of supported virtqueue pairs.
+.It Va dev.vtnet. Ns Ar X Ns Va .flags
+The flags of the interface. Mostly for debugging purposes.
.El
.Sh SEE ALSO
.Xr arp 4 ,
diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c
--- a/sys/dev/virtio/network/if_vtnet.c
+++ b/sys/dev/virtio/network/if_vtnet.c
@@ -40,6 +40,7 @@
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/msan.h>
+#include <sys/sbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/random.h>
@@ -4398,6 +4399,22 @@
"Times the transmit interrupt task rescheduled itself");
}
+static int
+vtnet_sysctl_flags(SYSCTL_HANDLER_ARGS)
+{
+ struct vtnet_softc *sc;
+ struct sbuf *sb;
+ int error;
+
+ sb = sbuf_new_auto();
+ sc = (struct vtnet_softc *)arg1;
+ sbuf_printf(sb, "%b", sc->vtnet_flags, VTNET_FLAGS_BITS);
+ sbuf_finish(sb);
+ error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
+ sbuf_delete(sb);
+ return (error);
+}
+
static void
vtnet_setup_sysctl(struct vtnet_softc *sc)
{
@@ -4420,6 +4437,9 @@
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
"Number of active virtqueue pairs");
+ SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "flags",
+ CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
+ vtnet_sysctl_flags, "A", "Flags");
vtnet_setup_stat_sysctl(ctx, child, sc);
}
diff --git a/sys/dev/virtio/network/if_vtnetvar.h b/sys/dev/virtio/network/if_vtnetvar.h
--- a/sys/dev/virtio/network/if_vtnetvar.h
+++ b/sys/dev/virtio/network/if_vtnetvar.h
@@ -191,6 +191,11 @@
char vtnet_mtx_name[16];
uint8_t vtnet_hwaddr[ETHER_ADDR_LEN];
};
+/* vtnet flag descriptions for use with printf(9) %b identifier. */
+#define VTNET_FLAGS_BITS \
+ "\20\1MODERN\2MAC\3CTRL_VQ\4CTRL_RX\5CTRL_MAC\6VLAN_FILTER\7TSO_ECN" \
+ "\10MRG_RXBUFS\11LRO_NOMRG\12MQ\13INDIRECT\14EVENT_IDX\15SUSPENDED" \
+ "\16FIXUP_NEEDS_CSUM\17SW_LRO"
static bool
vtnet_modern(struct vtnet_softc *sc)

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