freebsd-dev/sys/arm/conf/BWCT
Jonathan T. Looney bd79708dbf In the TCP stack, the hhook(9) framework provides hooks for kernel modules
to add actions that run when a TCP frame is sent or received on a TCP
session in the ESTABLISHED state. In the base tree, this functionality is
only used for the h_ertt module, which is used by the cc_cdg, cc_chd, cc_hd,
and cc_vegas congestion control modules.

Presently, we incur overhead to check for hooks each time a TCP frame is
sent or received on an ESTABLISHED TCP session.

This change adds a new compile-time option (TCP_HHOOK) to determine whether
to include the hhook(9) framework for TCP. To retain backwards
compatibility, I added the TCP_HHOOK option to every configuration file that
already defined "options INET". (Therefore, this patch introduces no
functional change. In order to see a functional difference, you need to
compile a custom kernel without the TCP_HHOOK option.) This change will
allow users to easily exclude this functionality from their kernel, should
they wish to do so.

Note that any users who use a custom kernel configuration and use one of the
congestion control modules listed above will need to add the TCP_HHOOK
option to their kernel configuration.

Reviewed by:	rrs, lstewart, hiren (previous version), sjg (makefiles only)
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D8185
2016-10-12 02:16:42 +00:00

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# BWCT -- Custom kernel configuration for the AT91RM9200 boards from bwct.de.
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
# http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ../../conf/NOTES and NOTES files.
# If you are in doubt as to the purpose or necessity of a line, check first
# in NOTES.
#
# $FreeBSD$
#NO_UNIVERSE
ident BWCT
include "std.arm"
options VERBOSE_INIT_ARM
include "../at91/std.bwct"
#To statically compile in device wiring instead of /boot/device.hints
hints "BWCT.hints"
makeoptions MODULES_OVERRIDE=""
options SCHED_4BSD # 4BSD scheduler
options INET # InterNETworking
#options INET6 # IPv6 communications protocols
options TCP_HHOOK # hhook(9) framework for TCP
options FFS # Berkeley Fast Filesystem
options SOFTUPDATES # Enable FFS soft updates support
#options UFS_ACL # Support for access control lists
#options UFS_DIRHASH # Improve performance on big directories
#options MD_ROOT # MD is a potential root device
#options MD_ROOT_SIZE=4096 # 4MB ram disk
options NFSCL # Network Filesystem Client
#options NFSD # Network Filesystem Server
#options NFSLOCKD # Network Lock Manager
options NFS_ROOT # NFS usable as /, requires NFSCL
options TMPFS # Efficient memory filesystem
#options MSDOSFS # MSDOS Filesystem
#options CD9660 # ISO 9660 Filesystem
#options PROCFS # Process filesystem (requires PSEUDOFS)
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_PART_BSD # BSD partition scheme
options GEOM_PART_MBR # MBR partition scheme
#options SCSI_DELAY=5000 # Delay (in ms) before probing SCSI
#options KTRACE # ktrace(1) support
options SYSVSHM # SYSV-style shared memory
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
options _KPOSIX_PRIORITY_SCHEDULING #POSIX P1003_1B real-time extensions
options BOOTP
options BOOTP_NFSROOT
#options ROOTDEVNAME=\"ufs:md0\"
#options ROOTDEVNAME=\"ufs:/dev/mmcsd0s1a\"
# kernel/memory size reduction
options MUTEX_NOINLINE
options NO_FFS_SNAPSHOT
options NO_SWAPPING
#options NO_SYSCTL_DESCR
options RWLOCK_NOINLINE
# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device bpf # Berkeley packet filter
# Ethernet
device mii # Minimal MII support
device ate # Atmel AT91 Ethernet driver
device rlswitch
# I2C
device at91_twi # Atmel AT91 Two-wire Interface
device iic # I2C generic I/O device driver
device iicbus # I2C bus system
device ds1672 # DS1672 on I2C bus
#device iicsmb # smb over i2c bridge
#device smbus # Bus support, required for smb below.
#device smb
# MMC/SD
device at91_mci # Atmel AT91 Multimedia Card Interface
device mmc # MMC/SD bus
device mmcsd # MMC/SD memory card
# DataFlash
device at91_spi # Atmel AT91 Serial Peripheral Interface
device spibus # SPI bus
#device at45d # Atmel AT45D
# Pseudo devices.
device loop # Network loopback
device random # Entropy device
device ether # Ethernet support
device vlan # 802.1Q VLAN support
device md # Memory "disks"
# Serial (COM) ports
device uart # Multi-uart driver
# USB support
#device ohci
#device usb
#device umass # Disks/Mass storage - Requires scbus and da
device at91_ssc