5 files changed, 183 insertions, 21 deletions
diff --git a/share/man/man4/ata.4 b/share/man/man4/ata.4
index feea1dd3cc85..29b6bbef6838 100644
--- a/share/man/man4/ata.4
+++ b/share/man/man4/ata.4
@@ -155,7 +155,9 @@ The
 .Va hw.ata.ata_dma_check_80pin
 tunable can be set to 0 to disable this check.
 .Sh HARDWARE
-The currently supported ATA/SATA controller chips are:
+The
+.Nm
+driver supports the IDE interface on the following ATA/SATA controllers:
 .Pp
 .Bl -tag -width "Silicon Image:" -compact
 .It Acard:
diff --git a/share/man/man4/tap.4 b/share/man/man4/tap.4
index 95a681a923d2..a4fe98cdfecf 100644
--- a/share/man/man4/tap.4
+++ b/share/man/man4/tap.4
@@ -203,6 +203,21 @@ The argument should be a pointer to a
 The interface name will be returned in the
 .Va ifr_name
 field.
+.It Dv TAPSTRANSIENT
+The argument should be a pointer to an
+.Va int ;
+this sets the transient flag on
+the
+.Nm
+device.
+A transient
+.Nm
+will be destroyed upon last close.
+.It Dv TAPGTRANSIENT
+The argument should be a pointer to an
+.Va int ;
+this stores the current state (enabled or disabled) of the transient flag into
+it.
 .It Dv FIONBIO
 Turn non-blocking I/O for reads off or on, according as the argument
 .Va int Ns 's
diff --git a/share/man/man4/tun.4 b/share/man/man4/tun.4
index 58f67cb20acb..1c5bd35f0ab8 100644
--- a/share/man/man4/tun.4
+++ b/share/man/man4/tun.4
@@ -282,6 +282,21 @@ The argument should be a pointer to an
 the ioctl sets the value to one if the device is in
 .Dq multi-af
 mode, and zero otherwise.
+.It Dv TUNSTRANSIENT
+The argument should be a pointer to an
+.Va int ;
+this sets the transient flag on
+the
+.Nm
+device.
+A transient
+.Nm
+will be destroyed upon last close.
+.It Dv TUNGTRANSIENT
+The argument should be a pointer to an
+.Va int ;
+this stores the current state (enabled or disabled) of the transient flag into
+it.
 .It Dv FIONBIO
 Turn non-blocking I/O for reads off or on, according as the argument
 .Vt int Ns 's
diff --git a/share/man/man4/umb.4 b/share/man/man4/umb.4
index 7ecc9a39c1ca..311a50faf8e7 100644
--- a/share/man/man4/umb.4
+++ b/share/man/man4/umb.4
@@ -17,34 +17,34 @@
 .\"
 .\" $NetBSD: umb.4,v 1.4 2019/08/30 09:22:17 wiz Exp $
 .\"
-.Dd May 11, 2025
+.Dd August 4, 2025
 .Dt UMB 4
 .Os
 .Sh NAME
 .Nm umb
 .Nd USB Mobile Broadband Interface Model (MBIM) cellular modem driver
 .Sh SYNOPSIS
-To compile this driver into the kernel,
-place the following lines in your
-kernel configuration file:
-.Bd -ragged -offset indent
+.Cd "device netmap"
 .Cd "device usb"
 .Cd "device umb"
-.Ed
 .Pp
-Alternatively, to load the driver as a
-module at boot time, place the following line in
+In
 .Xr loader.conf 5 :
-.Bd -literal -offset indent
-umb_load="YES"
-.Ed
-.Pp
-If neither of the above is done, the driver will automatically be loaded
-by devd(8) when the device is connected.
+.Cd umb_load="YES"
 .Sh DESCRIPTION
 The
 .Nm
 driver provides support for USB MBIM devices.
+If the appropriate hardware is detected,
+the driver will be loaded automatically by
+.Xr devmatch 8 .
+To load the driver manually,
+.Cm load
+it in
+.Xr loader.conf 5
+or at the
+.Xr loader 8
+prompt.
 .Pp
 MBIM devices establish connections via cellular networks such as
 GPRS, UMTS, and LTE.
diff --git a/share/man/man4/vtnet.4 b/share/man/man4/vtnet.4
index 8b99cd9f17b9..b6f10ddd87cb 100644
--- 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 July 29, 2025
+.Dd August 21, 2025
 .Dt VTNET 4
 .Os
 .Sh NAME
@@ -68,20 +68,29 @@ prompt before booting the kernel or stored in
 .Bl -tag -width "xxxxxx"
 .It Va hw.vtnet.csum_disable
 .It Va hw.vtnet. Ns Ar X Ns Va .csum_disable
-This tunable disables receive and send checksum offload.
+This tunable disables receive and transmit checksum offloading for TCP and
+UDP.
+This also implies that TCP segmentation offloading and large receive offload
+are disabled.
 The default value is 0.
 .It Va hw.vtnet.fixup_needs_csum
 .It Va hw.vtnet. Ns Ar X Ns Va .fixup_needs_csum
-This tunable enforces the calculation of a valid checksum for NEEDS_CSUM
-packets.
+This tunable enforces the calculation of a valid TCP or UDP checksum for
+packets received with 
+.Dv VIRTIO_NET_HDR_F_NEEDS_CSUM
+being set in the
+.Va flags
+field of the structure
+.Vt struct virtio_net_hdr .
+It also marks the checksum as being correct in the mbuf packet header.
 The default value is 0.
 .It Va hw.vtnet.tso_disable
 .It Va hw.vtnet. Ns Ar X Ns Va .tso_disable
-This tunable disables TSO.
+This tunable disables TCP segmentation offloading.
 The default value is 0.
 .It Va hw.vtnet.lro_disable
 .It Va hw.vtnet. Ns Ar X Ns Va .lro_disable
-This tunable disables LRO.
+This tunable disables large receive offload.
 The default value is 0.
 .It Va hw.vtnet.mq_disable
 .It Va hw.vtnet. Ns Ar X Ns Va .mq_disable
@@ -117,6 +126,127 @@ This tunable disables ALTQ support, allowing the use of multiqueue instead.
 This option applies to all interfaces.
 The default value is 0.
 .El
+.Sh TRANSMIT QUEUE STATISTICS
+.Bl -tag -width "xxxxxx"
+For each transmit queue of each interface the following read-only statistics
+are provided:
+.Bl -tag -width "xxxxxx"
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .rescheduled
+The number of times the transmit interrupt handler was rescheduled.
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .tso
+The number of times TCP segment offloading was performed.
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .csum
+The number of times transmit checksum offloading for UDP or TCP was
+performed.
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .omcasts
+The number of multicast packets that were transmitted.
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .obytes
+The number of bytes that were transmitted (based on Ethernet frames).
+.It Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .opackets
+The number of packets that were transmitted (Ethernet frames).
+.El
+.Sh RECEIVE QUEUE STATISTICS
+For each receive queue of each interface the following read-only statistics
+are provided:
+.Bl -tag -width "xxxxxx"
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .rescheduled
+The number of times the receive interrupt handler was rescheduled.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .host_lro
+The number of times TCP large receive offload was performed.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .csum_failed
+Currently not used.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .csum
+The number of times receive checksum offloading for UDP or TCP was performed.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .ierrors
+The number of times an error occurred during input processing.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .iqdrops
+The number of times a packet was dropped during input processing.
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .ibytes
+The number of bytes that were received (based on Ethernet frames).
+.It Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .ipackets
+The number of packets that were received (Ethernet frames).
+.El
+.Sh INTERFACE TRANSMIT STATISTICS
+For each interface the following read-only transmit statistics are provided:
+.Bl -tag -width "xxxxxx"
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_task_rescheduled
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .rescheduled
+over all transmit queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_tso_offloaded
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .tso
+over all transmit queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_csum_offloaded
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .txq Ns Ar Y Ns Va .csum
+over all transmit queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_defrag_failed
+The number of times an attempt to defragment an mbuf chain failed during a
+transmit operation.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_defragged
+The number of times an mbuf chain was defragmented during a transmit operation.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_tso_without_csum
+The number of times TCP segment offloading was attempted without transmit
+checksum offloading.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_tso_not_tcp
+The number of times TCP segment offloading was attempted for a non-TCP packet.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_csum_proto_mismatch
+The number of times the IP protocol version of the transmit checksum
+offloading request did not match the IP protocol version of the packet.
+.It Va dev.vtnet. Ns Ar X Ns Va .tx_csum_unknown_ethtype
+The number of times a transmit offload operation was requested for an
+ethernet frame for which the EtherType was neither IPv4 nor IPv6
+(considering simple VLAN tagging).
+.El
+.Sh INTERFACE RECEIVE STATISTICS
+For each interface the following read-only receive statistics are provided:
+.Bl -tag -width "xxxxxx"
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_task_rescheduled
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .rescheduled
+over all receive queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_offloaded
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .csum
+over all receive queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_failed
+The sum of
+.Va dev.vtnet. Ns Ar X Ns Va .rxq Ns Ar Y Ns Va .csum_failed
+over all receive queues of the interface.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_bad_proto
+Currently unused.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_bad_offset
+Currently unused.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_bad_ipproto
+Currently unused.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_csum_bad_ethtype
+The number of times fixing the checksum required by
+.Va hw.vtnet.fixup_needs_csum
+or
+.Va hw.vtnet. Ns Ar X Ns Va .fixup_needs_csum
+was attempted for a packet with an EtherType other than IPv4 or IPv6.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_mergeable_failed
+The number of times receiving a mergable buffer failed.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_enq_replacement_failed
+The number of times the enqueuing the replacement receive mbuf chain failed.
+.It Va dev.vtnet. Ns Ar X Ns Va .rx_frame_too_large
+The number of times the frame was loger than the mbuf chain during large
+receive offload without mergeable buffers.
+.It Va dev.vtnet. Ns Ar X Ns Va .mbuf_alloc_failed
+The number of times an mbuf cluster allocation for the receive buffer failed.
+.El
+.Sh INTERFACE CONFIGURATION PARAMETER
+For each interface the following read-only configuration parameters are
+provided:
+.Bl -tag -width "xxxxxx"
+.It Va dev.vtnet. Ns Ar X Ns Va .act_vq_pairs
+The number of active virtqueue pairs.
+.It Va dev.vtnet. Ns Ar X Ns Va .req_vq_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.
+.El
 .Sh SEE ALSO
 .Xr arp 4 ,
 .Xr netintro 4 ,