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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
Download Patch File Download Diff File Expand all files Collapse all files
share/man/man4/vtnet.4
+3 -1
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@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.Dd September 30, 2025 .Dd December 18, 2025
.Dt VTNET 4 .Dt VTNET 4
.Os .Os
.Sh NAME .Sh NAME
@@ -271,6 +271,8 @@ The number of active virtqueue pairs.
The number of requested virtqueue pairs. The number of requested virtqueue pairs.
.It Va dev.vtnet. Ns Ar X Ns Va .max_vq_pairs .It Va dev.vtnet. Ns Ar X Ns Va .max_vq_pairs
The maximum number of supported virtqueue 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 .El
.Sh SEE ALSO .Sh SEE ALSO
.Xr arp 4 , .Xr arp 4 ,
sys/dev/virtio/network/if_vtnet.c
+20
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@@ -40,6 +40,7 @@
#include <sys/mbuf.h> #include <sys/mbuf.h>
#include <sys/module.h> #include <sys/module.h>
#include <sys/msan.h> #include <sys/msan.h>
#include <sys/sbuf.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <sys/sysctl.h> #include <sys/sysctl.h>
#include <sys/random.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"); "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 static void
vtnet_setup_sysctl(struct vtnet_softc *sc) 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", SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
"Number of active virtqueue pairs"); "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); vtnet_setup_stat_sysctl(ctx, child, sc);
} }
sys/dev/virtio/network/if_vtnetvar.h
+5
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@@ -191,6 +191,11 @@ struct vtnet_softc {
char vtnet_mtx_name[16]; char vtnet_mtx_name[16];
uint8_t vtnet_hwaddr[ETHER_ADDR_LEN]; 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 static bool
vtnet_modern(struct vtnet_softc *sc) vtnet_modern(struct vtnet_softc *sc)