13 files changed, 275 insertions, 30 deletions
diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index 519b113b0a2e..1d708cfda019 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -8,6 +8,9 @@ MANPACKAGE=	kernel
 # the doc repository); otherwise the automatically generated hardware
 # notes will not include your driver.
 
+# If you enable a driver for a different architecture, please remember
+# to update the arch specifier in the document title of the manual.
+
 MAN=	aac.4 \
 	aacraid.4 \
 	acpi.4 \
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/epair.4 b/share/man/man4/epair.4
index 342b15b5612a..0014836b01ea 100644
--- a/share/man/man4/epair.4
+++ b/share/man/man4/epair.4
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 12, 2025
+.Dd September 2, 2025
 .Dt EPAIR 4
 .Os
 .Sh NAME
@@ -108,6 +108,28 @@ As with any other Ethernet interface,
 can have a
 .Xr vlan 4
 configured on top of it.
+.Pp
+The
+.Nm
+has RXCSUM and RXCSUM6 enabled because it may receive a packet where the
+checksum has already been validated by a physical interface.
+The
+.Nm
+supports TXCSUM and TXCSUM6 for TCP and UDP, but only by forwarding the order
+to compute the checksum.
+Thus, when using an
+.Nm
+interface, a TCP or UDP sender can offload checksum computation
+to a physical interface.
+Note that, in case the packet does not leave the host, the checksum is
+unnecessary and will be ignored if offloaded.
+TXCSUM and TXCSUM6 are synchronized between the
+.Nm
+interface pair (i.e., enabling/disabling the capability on one end
+enables/disables it on the other end).
+In case one end is in a bridge and the bridge disabled TXCSUM or TXCSUM6,
+this avoids a sender to send packets with checksum offloading into the
+bridge by using the other end.
 .Sh SEE ALSO
 .Xr ioctl 2 ,
 .Xr altq 4 ,
diff --git a/share/man/man4/gif.4 b/share/man/man4/gif.4
index ad33d5d21e81..cc12d91b72ea 100644
--- a/share/man/man4/gif.4
+++ b/share/man/man4/gif.4
@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 14, 2025
+.Dd August 27, 2025
 .Dt GIF 4
 .Os
 .Sh NAME
@@ -55,6 +55,16 @@ does not perform GRE encapsulation; use
 .Xr gre 4
 for GRE encapsulation.
 .Pp
+The
+.Nm
+interface can also tunnel Ethernet traffic over IPv4 or IPv6
+when combined with a
+.Xr if_bridge 4
+interface using EtherIP protocol.
+See
+.Xr if_bridge 4
+for detailed setup.
+.Pp
 Each
 .Nm
 interface is created at runtime using interface cloning.
@@ -316,6 +326,13 @@ to the desired level of nesting.
 .%D December 1999
 .%O draft-ietf-ipsec-ecn-02.txt
 .Re
+.Rs
+.%A R. Housley
+.%A S. Hollenbeck
+.%T EtherIP: Tunneling Ethernet Frames in IP Datagrams
+.%R RFC 3378
+.%D September 2002
+.Re
 .\"
 .Sh HISTORY
 The
diff --git a/share/man/man4/gpio.4 b/share/man/man4/gpio.4
index 9a629ff402fd..b84bfb01de51 100644
--- a/share/man/man4/gpio.4
+++ b/share/man/man4/gpio.4
@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2013, Sean Bruno <sbruno@freebsd.org>
 .\" All rights reserved.
 .\"
@@ -22,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 27, 2019
+.Dd August 28, 2025
 .Dt GPIO 4
 .Os
 .Sh NAME
@@ -33,7 +36,6 @@ To compile these devices into your kernel and use the device hints, place the
 following lines in your kernel configuration file:
 .Bd -ragged -offset indent
 .Cd "device gpio"
-.Cd "device gpioc"
 .Cd "device gpioiic"
 .Cd "device gpioled"
 .Ed
diff --git a/share/man/man4/iflib.4 b/share/man/man4/iflib.4
index 0114263e6ca2..2040698f0087 100644
--- a/share/man/man4/iflib.4
+++ b/share/man/man4/iflib.4
@@ -1,4 +1,4 @@
-.Dd September 27, 2018
+.Dd August 20, 2025
 .Dt IFLIB 4
 .Os
 .Sh NAME
@@ -64,6 +64,18 @@ If this is zero or not set, an RX and TX queue pair will be assigned to each
 core.
 When set to a non-zero value, TX queues are assigned to cores following the
 last RX queue.
+.It Va simple_tx
+When set to one, iflib uses a simple transmit routine with no queuing at all.
+By default, iflib uses a highly optimized, lockless, transmit queue called
+mp_ring.
+This performs well when there are more CPU cores than NIC
+queues and prevents lock contention for transmit resources.
+Unfortunately, mp_ring incurs unneeded overheads on workloads where
+resource contention is not a problem (well behaved applications on
+systems where there are as many NIC queues as CPU cores).
+Note that when this is enabled, the tx_abdicate sysctl is no longer
+applicable and is ignored.
+Defaults to zero.
 .El
 .Pp
 These
diff --git a/share/man/man4/iwlwifi.4 b/share/man/man4/iwlwifi.4
index 4a251f239a55..660f6a9bf57c 100644
--- a/share/man/man4/iwlwifi.4
+++ b/share/man/man4/iwlwifi.4
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 13, 2025
+.Dd August 19, 2025
 .Dt IWLWIFI 4
 .Os
 .Sh NAME
@@ -331,7 +331,7 @@ driver first appeared in
 802.11n and 802.11ac support for the 22000 and later chipsets first appeared in
 .Fx 14.3 .
 .Sh BUGS
-Certainly.
+.Lk https://bugs.freebsd.org/bugzilla/showdependencytree.cgi?id=iwlwifi "iwlwifi known bugs"
 .Pp
 While
 .Nm
diff --git a/share/man/man4/puc.4 b/share/man/man4/puc.4
index a29376d3f2d5..624c215027af 100644
--- a/share/man/man4/puc.4
+++ b/share/man/man4/puc.4
@@ -257,6 +257,8 @@ Sunix SER5xxxx 8/4/2 port serial
 .It
 Syba Tech Ltd PCI-4S2P-550-ECP
 .It
+Systembase SB16C1054/8 4/8 port serial
+.It
 Titan PCI-800H/PCI-200H
 .It
 VScom:
diff --git a/share/man/man4/syncache.4 b/share/man/man4/syncache.4
index e92502fd15ff..f83e9b083e45 100644
--- a/share/man/man4/syncache.4
+++ b/share/man/man4/syncache.4
@@ -10,7 +10,7 @@
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\"
-.Dd April 12, 2021
+.Dd August 30, 2025
 .Dt SYNCACHE 4
 .Os
 .Sh NAME
@@ -39,6 +39,8 @@ MIBs for controlling TCP SYN caching
 .Nm sysctl Cm net.inet.tcp.syncache.count
 .It
 .Nm sysctl Cm net.inet.tcp.syncache.see_other
+.It
+.Nm sysctl Cm net.inet.tcp.syncache.rst_on_sock_fail
 .El
 .Sh DESCRIPTION
 The
@@ -107,6 +109,18 @@ and run only with
 set
 .Va net.inet.tcp.syncookies_only
 to 1.
+To use
+.Nm syncookies
+to handle bucket overflows in the
+.Nm syncache
+set
+.Va net.inet.tcp.syncookies
+to 1.
+The default value for
+.Va net.inet.tcp.syncookies_only
+is 0 and the default value for
+.Va net.inet.tcp.syncookies
+is 1.
 .Pp
 The
 .Nm
@@ -169,6 +183,9 @@ However, extra
 .Xr ucred 9
 referencing is required on every incoming SYN packet processed.
 The default is off.
+.It Va rst_on_sock_fail
+Send a TCP RST segment if the socket allocation fails.
+The default is on.
 .El
 .Pp
 Statistics on the performance of the
@@ -206,8 +223,16 @@ Entries dropped due to ICMP unreachable messages.
 Failures to allocate new
 .Nm
 entry.
+.It Li "cookies sent"
+SYN cookies sent in SYN ACK segments.
 .It Li "cookies received"
-Connections created from segment containing ACK.
+ACK segments with valid syncookies which resulted in TCP connection
+establishment.
+.It Li "spurious cookies rejected"
+Received ACKs, for which the syncache lookup failed and also no syncookie was
+recently sent.
+.It Li "failed cookies rejected"
+Received ACKs for which the syncookie validation failed.
 .El
 .Sh SEE ALSO
 .Xr netstat 1 ,
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 ,