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[linux-2.6] / net / sched / Kconfig

#
# Traffic control configuration.
# 

menuconfig NET_SCHED
        bool "QoS and/or fair queueing"
        ---help---
          When the kernel has several packets to send out over a network
          device, it has to decide which ones to send first, which ones to
          delay, and which ones to drop. This is the job of the packet
          scheduler, and several different algorithms for how to do this
          "fairly" have been proposed.

          If you say N here, you will get the standard packet scheduler, which
          is a FIFO (first come, first served). If you say Y here, you will be
          able to choose from among several alternative algorithms which can
          then be attached to different network devices. This is useful for
          example if some of your network devices are real time devices that
          need a certain minimum data flow rate, or if you need to limit the
          maximum data flow rate for traffic which matches specified criteria.
          This code is considered to be experimental.

          To administer these schedulers, you'll need the user-level utilities
          from the package iproute2+tc at <ftp://ftp.tux.org/pub/net/ip-routing/>.
          That package also contains some documentation; for more, check out
          <http://snafu.freedom.org/linux2.2/iproute-notes.html>.

          This Quality of Service (QoS) support will enable you to use
          Differentiated Services (diffserv) and Resource Reservation Protocol
          (RSVP) on your Linux router if you also say Y to "QoS support",
          "Packet classifier API" and to some classifiers below. Documentation
          and software is at <http://diffserv.sourceforge.net/>.

          If you say Y here and to "/proc file system" below, you will be able
          to read status information about packet schedulers from the file
          /proc/net/psched.

          The available schedulers are listed in the following questions; you
          can say Y to as many as you like. If unsure, say N now.

choice
        prompt "Packet scheduler clock source"
        depends on NET_SCHED
        default NET_SCH_CLK_JIFFIES
        help
          Packet schedulers need a monotonic clock that increments at a static
          rate. The kernel provides several suitable interfaces, each with
          different properties:
          
          - high resolution (us or better)
          - fast to read (minimal locking, no i/o access)
          - synchronized on all processors
          - handles cpu clock frequency changes

          but nothing provides all of the above.

config NET_SCH_CLK_JIFFIES
        bool "Timer interrupt"
        help
          Say Y here if you want to use the timer interrupt (jiffies) as clock
          source. This clock source is fast, synchronized on all processors and
          handles cpu clock frequency changes, but its resolution is too low
          for accurate shaping except at very low speed.

config NET_SCH_CLK_GETTIMEOFDAY
        bool "gettimeofday"
        help
          Say Y here if you want to use gettimeofday as clock source. This clock
          source has high resolution, is synchronized on all processors and
          handles cpu clock frequency changes, but it is slow.

          Choose this if you need a high resolution clock source but can't use
          the CPU's cycle counter.

config NET_SCH_CLK_CPU
        bool "CPU cycle counter"
        depends on X86_TSC || X86_64 || ALPHA || SPARC64 || PPC64 || IA64
        help
          Say Y here if you want to use the CPU's cycle counter as clock source.
          This is a cheap and high resolution clock source, but on some
          architectures it is not synchronized on all processors and doesn't
          handle cpu clock frequency changes.

          The useable cycle counters are:

                x86/x86_64      - Timestamp Counter
                alpha           - Cycle Counter
                sparc64         - %ticks register
                ppc64           - Time base
                ia64            - Interval Time Counter

          Choose this if your CPU's cycle counter is working properly.

endchoice

config NET_SCH_CBQ
        tristate "CBQ packet scheduler"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to use the Class-Based Queueing (CBQ) packet
          scheduling algorithm for some of your network devices.  This
          algorithm classifies the waiting packets into a tree-like hierarchy
          of classes; the leaves of this tree are in turn scheduled by
          separate algorithms (called "disciplines" in this context).

          See the top of <file:net/sched/sch_cbq.c> for references about the
          CBQ algorithm.

          CBQ is a commonly used scheduler, so if you're unsure, you should
          say Y here. Then say Y to all the queueing algorithms below that you
          want to use as CBQ disciplines.  Then say Y to "Packet classifier
          API" and say Y to all the classifiers you want to use; a classifier
          is a routine that allows you to sort your outgoing traffic into
          classes based on a certain criterion.

          To compile this code as a module, choose M here: the
          module will be called sch_cbq.

config NET_SCH_HTB
        tristate "HTB packet scheduler"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to use the Hierarchical Token Buckets (HTB)
          packet scheduling algorithm for some of your network devices. See
          <http://luxik.cdi.cz/~devik/qos/htb/> for complete manual and
          in-depth articles.

          HTB is very similar to the CBQ regarding its goals however is has 
          different properties and different algorithm.

          To compile this code as a module, choose M here: the
          module will be called sch_htb.

config NET_SCH_HFSC
        tristate "HFSC packet scheduler"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to use the Hierarchical Fair Service Curve
          (HFSC) packet scheduling algorithm for some of your network devices.

          To compile this code as a module, choose M here: the
          module will be called sch_hfsc.

#tristate '  H-PFQ packet scheduler' CONFIG_NET_SCH_HPFQ
config NET_SCH_ATM
        tristate "ATM pseudo-scheduler"
        depends on NET_SCHED && ATM
        ---help---
          Say Y here if you want to use the ATM pseudo-scheduler.  This
          provides a framework for invoking classifiers (aka "filters"), which
          in turn select classes of this queuing discipline.  Each class maps
          the flow(s) it is handling to a given virtual circuit (see the top of
          <file:net/sched/sch_atm.c>).

          To compile this code as a module, choose M here: the
          module will be called sch_atm.

config NET_SCH_PRIO
        tristate "The simplest PRIO pseudoscheduler"
        depends on NET_SCHED
        help
          Say Y here if you want to use an n-band priority queue packet
          "scheduler" for some of your network devices or as a leaf discipline
          for the CBQ scheduling algorithm. If unsure, say Y.

          To compile this code as a module, choose M here: the
          module will be called sch_prio.

config NET_SCH_RED
        tristate "RED queue"
        depends on NET_SCHED
        help
          Say Y here if you want to use the Random Early Detection (RED)
          packet scheduling algorithm for some of your network devices (see
          the top of <file:net/sched/sch_red.c> for details and references
          about the algorithm).

          To compile this code as a module, choose M here: the
          module will be called sch_red.

config NET_SCH_SFQ
        tristate "SFQ queue"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
          packet scheduling algorithm for some of your network devices or as a
          leaf discipline for the CBQ scheduling algorithm (see the top of
          <file:net/sched/sch_sfq.c> for details and references about the SFQ
          algorithm).

          To compile this code as a module, choose M here: the
          module will be called sch_sfq.

config NET_SCH_TEQL
        tristate "TEQL queue"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to use the True Link Equalizer (TLE) packet
          scheduling algorithm for some of your network devices or as a leaf
          discipline for the CBQ scheduling algorithm. This queueing
          discipline allows the combination of several physical devices into
          one virtual device. (see the top of <file:net/sched/sch_teql.c> for
          details).

          To compile this code as a module, choose M here: the
          module will be called sch_teql.

config NET_SCH_TBF
        tristate "TBF queue"
        depends on NET_SCHED
        help
          Say Y here if you want to use the Simple Token Bucket Filter (TBF)
          packet scheduling algorithm for some of your network devices or as a
          leaf discipline for the CBQ scheduling algorithm (see the top of
          <file:net/sched/sch_tbf.c> for a description of the TBF algorithm).

          To compile this code as a module, choose M here: the
          module will be called sch_tbf.

config NET_SCH_GRED
        tristate "GRED queue"
        depends on NET_SCHED
        help
          Say Y here if you want to use the Generic Random Early Detection
          (GRED) packet scheduling algorithm for some of your network devices
          (see the top of <file:net/sched/sch_red.c> for details and
          references about the algorithm).

          To compile this code as a module, choose M here: the
          module will be called sch_gred.

config NET_SCH_DSMARK
        tristate "Diffserv field marker"
        depends on NET_SCHED
        help
          Say Y if you want to schedule packets according to the
          Differentiated Services architecture proposed in RFC 2475.
          Technical information on this method, with pointers to associated
          RFCs, is available at <http://www.gta.ufrj.br/diffserv/>.

          To compile this code as a module, choose M here: the
          module will be called sch_dsmark.

config NET_SCH_NETEM
        tristate "Network emulator"
        depends on NET_SCHED
        help
          Say Y if you want to emulate network delay, loss, and packet
          re-ordering. This is often useful to simulate networks when
          testing applications or protocols.

          To compile this driver as a module, choose M here: the module
          will be called sch_netem.

          If unsure, say N.

config NET_SCH_INGRESS
        tristate "Ingress Qdisc"
        depends on NET_SCHED 
        help
          If you say Y here, you will be able to police incoming bandwidth
          and drop packets when this bandwidth exceeds your desired rate.
          If unsure, say Y.

          To compile this code as a module, choose M here: the
          module will be called sch_ingress.

config NET_QOS
        bool "QoS support"
        depends on NET_SCHED
        ---help---
          Say Y here if you want to include Quality Of Service scheduling
          features, which means that you will be able to request certain
          rate-of-flow limits for your network devices.

          This Quality of Service (QoS) support will enable you to use
          Differentiated Services (diffserv) and Resource Reservation Protocol
          (RSVP) on your Linux router if you also say Y to "Packet classifier
          API" and to some classifiers below. Documentation and software is at
          <http://diffserv.sourceforge.net/>.

          Note that the answer to this question won't directly affect the
          kernel: saying N will just cause the configurator to skip all
          the questions about QoS support.

config NET_ESTIMATOR
        bool "Rate estimator"
        depends on NET_QOS
        help
          In order for Quality of Service scheduling to work, the current
          rate-of-flow for a network device has to be estimated; if you say Y
          here, the kernel will do just that.

config NET_CLS
        bool "Packet classifier API"
        depends on NET_SCHED
        ---help---
          The CBQ scheduling algorithm requires that network packets which are
          scheduled to be sent out over a network device be classified
          according to some criterion. If you say Y here, you will get a
          choice of several different packet classifiers with the following
          questions.

          This will enable you to use Differentiated Services (diffserv) and
          Resource Reservation Protocol (RSVP) on your Linux router.
          Documentation and software is at
          <http://diffserv.sourceforge.net/>.

config NET_CLS_BASIC
        tristate "Basic classifier"
        depends on NET_CLS
        ---help---
          Say Y here if you want to be able to classify packets using
          only extended matches and actions.

          To compile this code as a module, choose M here: the
          module will be called cls_basic.

config NET_CLS_TCINDEX
        tristate "TC index classifier"
        depends on NET_CLS
        help
          If you say Y here, you will be able to classify outgoing packets
          according to the tc_index field of the skb. You will want this
          feature if you want to implement Differentiated Services using
          sch_dsmark. If unsure, say Y.

          To compile this code as a module, choose M here: the
          module will be called cls_tcindex.

config NET_CLS_ROUTE4
        tristate "Routing table based classifier"
        depends on NET_CLS
        select NET_CLS_ROUTE
        help
          If you say Y here, you will be able to classify outgoing packets
          according to the route table entry they matched. If unsure, say Y.

          To compile this code as a module, choose M here: the
          module will be called cls_route.

config NET_CLS_ROUTE
        bool
        default n

config NET_CLS_FW
        tristate "Firewall based classifier"
        depends on NET_CLS
        help
          If you say Y here, you will be able to classify outgoing packets
          according to firewall criteria you specified.

          To compile this code as a module, choose M here: the
          module will be called cls_fw.

config NET_CLS_U32
        tristate "U32 classifier"
        depends on NET_CLS
        help
          If you say Y here, you will be able to classify outgoing packets
          according to their destination address. If unsure, say Y.

          To compile this code as a module, choose M here: the
          module will be called cls_u32.

config CLS_U32_PERF
        bool "U32 classifier performance counters"
        depends on NET_CLS_U32
        help
          gathers stats that could be used to tune u32 classifier performance.
          Requires a new iproute2
          You MUST NOT turn this on if you dont have an update iproute2.

config NET_CLS_IND
        bool "classify input device (slows things u32/fw) "
        depends on NET_CLS_U32 || NET_CLS_FW
        help
          This option will be killed eventually when a 
          metadata action appears because it slows things a little
          Available only for u32 and fw classifiers.
          Requires a new iproute2
          You MUST NOT turn this on if you dont have an update iproute2.

config CLS_U32_MARK
        bool "Use nfmark as a key in U32 classifier"
        depends on NET_CLS_U32 && NETFILTER
        help
          This allows you to match mark in a u32 filter.
          Example:
          tc filter add dev eth0 protocol ip parent 1:0 prio 5 u32 \
                match mark 0x0090 0xffff \
                match ip dst 4.4.4.4 \
                flowid 1:90
          You must use a new iproute2 to use this feature.

config NET_CLS_RSVP
        tristate "Special RSVP classifier"
        depends on NET_CLS && NET_QOS
        ---help---
          The Resource Reservation Protocol (RSVP) permits end systems to
          request a minimum and maximum data flow rate for a connection; this
          is important for real time data such as streaming sound or video.

          Say Y here if you want to be able to classify outgoing packets based
          on their RSVP requests.

          To compile this code as a module, choose M here: the
          module will be called cls_rsvp.

config NET_CLS_RSVP6
        tristate "Special RSVP classifier for IPv6"
        depends on NET_CLS && NET_QOS
        ---help---
          The Resource Reservation Protocol (RSVP) permits end systems to
          request a minimum and maximum data flow rate for a connection; this
          is important for real time data such as streaming sound or video.

          Say Y here if you want to be able to classify outgoing packets based
          on their RSVP requests and you are using the new Internet Protocol
          IPv6 as opposed to the older and more common IPv4.

          To compile this code as a module, choose M here: the
          module will be called cls_rsvp6.

config NET_EMATCH
        bool "Extended Matches"
        depends on NET_CLS
        ---help---
          Say Y here if you want to use extended matches on top of classifiers
          and select the extended matches below.

          Extended matches are small classification helpers not worth writing
          a separate classifier.

          You must have a recent version of the iproute2 tools in order to use
          extended matches.

config NET_EMATCH_STACK
        int "Stack size"
        depends on NET_EMATCH
        default "32"
        ---help---
          Size of the local stack variable used while evaluating the tree of
          ematches. Limits the depth of the tree, i.e. the number of
          encapsulated precedences. Every level requires 4 bytes of additional
          stack space.

config NET_EMATCH_CMP
        tristate "Simple packet data comparison"
        depends on NET_EMATCH
        ---help---
          Say Y here if you want to be able to classify packets based on
          simple packet data comparisons for 8, 16, and 32bit values.

          To compile this code as a module, choose M here: the
          module will be called em_cmp.

config NET_EMATCH_NBYTE
        tristate "Multi byte comparison"
        depends on NET_EMATCH
        ---help---
          Say Y here if you want to be able to classify packets based on
          multiple byte comparisons mainly useful for IPv6 address comparisons.

          To compile this code as a module, choose M here: the
          module will be called em_nbyte.

config NET_EMATCH_U32
        tristate "U32 hashing key"
        depends on NET_EMATCH
        ---help---
          Say Y here if you want to be able to classify packets using
          the famous u32 key in combination with logic relations.

          To compile this code as a module, choose M here: the
          module will be called em_u32.

config NET_EMATCH_META
        tristate "Metadata"
        depends on NET_EMATCH
        ---help---
          Say Y here if you want to be ablt to classify packets based on
          metadata such as load average, netfilter attributes, socket
          attributes and routing decisions.

          To compile this code as a module, choose M here: the
          module will be called em_meta.

config NET_EMATCH_TEXT
        tristate "Textsearch"
        depends on NET_EMATCH
        select TEXTSEARCH
        select TEXTSEARCH_KMP
        select TEXTSEARCH_BM
        select TEXTSEARCH_FSM
        ---help---
          Say Y here if you want to be ablt to classify packets based on
          textsearch comparisons.

          To compile this code as a module, choose M here: the
          module will be called em_text.

config NET_CLS_ACT
        bool "Packet ACTION"
        depends on EXPERIMENTAL && NET_CLS && NET_QOS
        ---help---
        This option requires you have a new iproute2. It enables
        tc extensions which can be used with tc classifiers.
          You MUST NOT turn this on if you dont have an update iproute2.

config NET_ACT_POLICE
        tristate "Policing Actions"
        depends on NET_CLS_ACT 
        ---help---
        If you are using a newer iproute2 select this one, otherwise use one
        below to select a policer.
          You MUST NOT turn this on if you dont have an update iproute2.

config NET_ACT_GACT
        tristate "generic Actions"
        depends on NET_CLS_ACT
        ---help---
        You must have new iproute2 to use this feature.
        This adds simple filtering actions like drop, accept etc.

config GACT_PROB
        bool "generic Actions probability"
        depends on NET_ACT_GACT
        ---help---
        Allows generic actions to be randomly or deterministically used.

config NET_ACT_MIRRED
        tristate "Packet In/Egress redirecton/mirror Actions"
        depends on NET_CLS_ACT
        ---help---
        requires new iproute2
        This allows packets to be mirrored or redirected to netdevices

config NET_ACT_IPT
        tristate "iptables Actions"
        depends on NET_CLS_ACT && NETFILTER && IP_NF_IPTABLES
        ---help---
        requires new iproute2
        This allows iptables targets to be used by tc filters

config NET_ACT_PEDIT
        tristate "Generic Packet Editor Actions"
        depends on NET_CLS_ACT
        ---help---
        requires new iproute2
        This allows for packets to be generically edited

config NET_CLS_POLICE
        bool "Traffic policing (needed for in/egress)"
        depends on NET_CLS && NET_QOS && NET_CLS_ACT!=y
        help
          Say Y to support traffic policing (bandwidth limits).  Needed for
          ingress and egress rate limiting.

config NET_ACT_SIMP
        tristate "Simple action"
        depends on NET_CLS_ACT
        ---help---
        You must have new iproute2 to use this feature.
        This adds a very simple action for demonstration purposes
        The idea is to give action authors a basic example to look at.
        All this action will do is print on the console the configured
        policy string followed by _ then packet count.