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vtnet: expose flags via sysctl tree

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Provide the flags used for a vtnet interface via the sysctl tree.
This is mostly used for debugging purposes.

Reviewed by:		Timo Völker
MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D54283
This commit is contained in:
Michael Tuexen 2025-12-18 15:42:13 +01:00
parent a8be81456c
commit e3a0571ad7
3 changed files with 28 additions and 1 deletions
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4
share/man/man4/vtnet.4
View file

@ -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 active virtqueue pairs.
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 ,

20
sys/dev/virtio/network/if_vtnet.c
View file

@ -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 @@ vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx,
"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 @@ vtnet_setup_sysctl(struct vtnet_softc *sc)
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);
}

5
sys/dev/virtio/network/if_vtnetvar.h
View file

@ -191,6 +191,11 @@ struct vtnet_softc {
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)