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/usr/src/linux-headers-5.15.0-190/net/sched/Kconfig
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# SPDX-License-Identifier: GPL-2.0-only # # Traffic control configuration. # menuconfig NET_SCHED bool "QoS and/or fair queueing" select NET_SCH_FIFO 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 queueing disciplines, 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 <https://www.kernel.org/pub/linux/utils/net/iproute2/>. That package also contains some documentation; for more, check out <http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2>. 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 the corresponding 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. if NET_SCHED comment "Queueing/Scheduling" config NET_SCH_HTB tristate "Hierarchical Token Bucket (HTB)" help Say Y here if you want to use the Hierarchical Token Buckets (HTB) packet scheduling algorithm. See <http://luxik.cdi.cz/~devik/qos/htb/> for complete manual and in-depth articles. HTB is very similar to 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 "Hierarchical Fair Service Curve (HFSC)" help Say Y here if you want to use the Hierarchical Fair Service Curve (HFSC) packet scheduling algorithm. To compile this code as a module, choose M here: the module will be called sch_hfsc. config NET_SCH_PRIO tristate "Multi Band Priority Queueing (PRIO)" help Say Y here if you want to use an n-band priority queue packet scheduler. To compile this code as a module, choose M here: the module will be called sch_prio. config NET_SCH_MULTIQ tristate "Hardware Multiqueue-aware Multi Band Queuing (MULTIQ)" help Say Y here if you want to use an n-band queue packet scheduler to support devices that have multiple hardware transmit queues. To compile this code as a module, choose M here: the module will be called sch_multiq. config NET_SCH_RED tristate "Random Early Detection (RED)" help Say Y here if you want to use the Random Early Detection (RED) packet scheduling algorithm. See the top of <file:net/sched/sch_red.c> for more details. To compile this code as a module, choose M here: the module will be called sch_red. config NET_SCH_SFB tristate "Stochastic Fair Blue (SFB)" help Say Y here if you want to use the Stochastic Fair Blue (SFB) packet scheduling algorithm. See the top of <file:net/sched/sch_sfb.c> for more details. To compile this code as a module, choose M here: the module will be called sch_sfb. config NET_SCH_SFQ tristate "Stochastic Fairness Queueing (SFQ)" help Say Y here if you want to use the Stochastic Fairness Queueing (SFQ) packet scheduling algorithm. See the top of <file:net/sched/sch_sfq.c> for more details. To compile this code as a module, choose M here: the module will be called sch_sfq. config NET_SCH_TEQL tristate "True Link Equalizer (TEQL)" help Say Y here if you want to use the True Link Equalizer (TLE) packet 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 more details. To compile this code as a module, choose M here: the module will be called sch_teql. config NET_SCH_TBF tristate "Token Bucket Filter (TBF)" help Say Y here if you want to use the Token Bucket Filter (TBF) packet scheduling algorithm. See the top of <file:net/sched/sch_tbf.c> for more details. To compile this code as a module, choose M here: the module will be called sch_tbf. config NET_SCH_CBS tristate "Credit Based Shaper (CBS)" help Say Y here if you want to use the Credit Based Shaper (CBS) packet scheduling algorithm. See the top of <file:net/sched/sch_cbs.c> for more details. To compile this code as a module, choose M here: the module will be called sch_cbs. config NET_SCH_ETF tristate "Earliest TxTime First (ETF)" help Say Y here if you want to use the Earliest TxTime First (ETF) packet scheduling algorithm. See the top of <file:net/sched/sch_etf.c> for more details. To compile this code as a module, choose M here: the module will be called sch_etf. config NET_SCH_TAPRIO tristate "Time Aware Priority (taprio) Scheduler" help Say Y here if you want to use the Time Aware Priority (taprio) packet scheduling algorithm. See the top of <file:net/sched/sch_taprio.c> for more details. To compile this code as a module, choose M here: the module will be called sch_taprio. config NET_SCH_GRED tristate "Generic Random Early Detection (GRED)" 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_NETEM tristate "Network emulator (NETEM)" 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_DRR tristate "Deficit Round Robin scheduler (DRR)" help Say Y here if you want to use the Deficit Round Robin (DRR) packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_drr. If unsure, say N. config NET_SCH_MQPRIO tristate "Multi-queue priority scheduler (MQPRIO)" help Say Y here if you want to use the Multi-queue Priority scheduler. This scheduler allows QOS to be offloaded on NICs that have support for offloading QOS schedulers. To compile this driver as a module, choose M here: the module will be called sch_mqprio. If unsure, say N. config NET_SCH_SKBPRIO tristate "SKB priority queue scheduler (SKBPRIO)" help Say Y here if you want to use the SKB priority queue scheduler. This schedules packets according to skb->priority, which is useful for request packets in DoS mitigation systems such as Gatekeeper. To compile this driver as a module, choose M here: the module will be called sch_skbprio. If unsure, say N. config NET_SCH_CHOKE tristate "CHOose and Keep responsive flow scheduler (CHOKE)" help Say Y here if you want to use the CHOKe packet scheduler (CHOose and Keep for responsive flows, CHOose and Kill for unresponsive flows). This is a variation of RED which tries to penalize flows that monopolize the queue. To compile this code as a module, choose M here: the module will be called sch_choke. config NET_SCH_QFQ tristate "Quick Fair Queueing scheduler (QFQ)" help Say Y here if you want to use the Quick Fair Queueing Scheduler (QFQ) packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_qfq. If unsure, say N. config NET_SCH_CODEL tristate "Controlled Delay AQM (CODEL)" help Say Y here if you want to use the Controlled Delay (CODEL) packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_codel. If unsure, say N. config NET_SCH_FQ_CODEL tristate "Fair Queue Controlled Delay AQM (FQ_CODEL)" help Say Y here if you want to use the FQ Controlled Delay (FQ_CODEL) packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_fq_codel. If unsure, say N. config NET_SCH_CAKE tristate "Common Applications Kept Enhanced (CAKE)" help Say Y here if you want to use the Common Applications Kept Enhanced (CAKE) queue management algorithm. To compile this driver as a module, choose M here: the module will be called sch_cake. If unsure, say N. config NET_SCH_FQ tristate "Fair Queue" help Say Y here if you want to use the FQ packet scheduling algorithm. FQ does flow separation, and is able to respect pacing requirements set by TCP stack into sk->sk_pacing_rate (for localy generated traffic) To compile this driver as a module, choose M here: the module will be called sch_fq. If unsure, say N. config NET_SCH_HHF tristate "Heavy-Hitter Filter (HHF)" help Say Y here if you want to use the Heavy-Hitter Filter (HHF) packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_hhf. config NET_SCH_PIE tristate "Proportional Integral controller Enhanced (PIE) scheduler" help Say Y here if you want to use the Proportional Integral controller Enhanced scheduler packet scheduling algorithm. For more information, please see https://tools.ietf.org/html/rfc8033 To compile this driver as a module, choose M here: the module will be called sch_pie. If unsure, say N. config NET_SCH_FQ_PIE depends on NET_SCH_PIE tristate "Flow Queue Proportional Integral controller Enhanced (FQ-PIE)" help Say Y here if you want to use the Flow Queue Proportional Integral controller Enhanced (FQ-PIE) packet scheduling algorithm. For more information, please see https://tools.ietf.org/html/rfc8033 To compile this driver as a module, choose M here: the module will be called sch_fq_pie. If unsure, say N. config NET_SCH_INGRESS tristate "Ingress/classifier-action Qdisc" depends on NET_CLS_ACT select NET_INGRESS select NET_EGRESS help Say Y here if you want to use classifiers for incoming and/or outgoing packets. This qdisc doesn't do anything else besides running classifiers, which can also have actions attached to them. In case of outgoing packets, classifiers that this qdisc holds are executed in the transmit path before real enqueuing to an egress qdisc happens. If unsure, say Y. To compile this code as a module, choose M here: the module will be called sch_ingress with alias of sch_clsact. config NET_SCH_PLUG tristate "Plug network traffic until release (PLUG)" help This queuing discipline allows userspace to plug/unplug a network output queue, using the netlink interface. When it receives an enqueue command it inserts a plug into the outbound queue that causes following packets to enqueue until a dequeue command arrives over netlink, causing the plug to be removed and resuming the normal packet flow. This module also provides a generic "network output buffering" functionality (aka output commit), wherein upon arrival of a dequeue command, only packets up to the first plug are released for delivery. The Remus HA project uses this module to enable speculative execution of virtual machines by allowing the generated network output to be rolled back if needed. For more information, please refer to <http://wiki.xenproject.org/wiki/Remus> Say Y here if you are using this kernel for Xen dom0 and want to protect Xen guests with Remus. To compile this code as a module, choose M here: the module will be called sch_plug. config NET_SCH_ETS tristate "Enhanced transmission selection scheduler (ETS)" help The Enhanced Transmission Selection scheduler is a classful queuing discipline that merges functionality of PRIO and DRR qdiscs in one scheduler. ETS makes it easy to configure a set of strict and bandwidth-sharing bands to implement the transmission selection described in 802.1Qaz. Say Y here if you want to use the ETS packet scheduling algorithm. To compile this driver as a module, choose M here: the module will be called sch_ets. If unsure, say N. menuconfig NET_SCH_DEFAULT bool "Allow override default queue discipline" help Support for selection of default queuing discipline. Nearly all users can safely say no here, and the default of pfifo_fast will be used. Many distributions already set the default value via /proc/sys/net/core/default_qdisc. If unsure, say N. if NET_SCH_DEFAULT choice prompt "Default queuing discipline" default DEFAULT_PFIFO_FAST help Select the queueing discipline that will be used by default for all network devices. config DEFAULT_FQ bool "Fair Queue" if NET_SCH_FQ config DEFAULT_CODEL bool "Controlled Delay" if NET_SCH_CODEL config DEFAULT_FQ_CODEL bool "Fair Queue Controlled Delay" if NET_SCH_FQ_CODEL config DEFAULT_FQ_PIE bool "Flow Queue Proportional Integral controller Enhanced" if NET_SCH_FQ_PIE config DEFAULT_SFQ bool "Stochastic Fair Queue" if NET_SCH_SFQ config DEFAULT_PFIFO_FAST bool "Priority FIFO Fast" endchoice config DEFAULT_NET_SCH string default "pfifo_fast" if DEFAULT_PFIFO_FAST default "fq" if DEFAULT_FQ default "fq_codel" if DEFAULT_FQ_CODEL default "fq_pie" if DEFAULT_FQ_PIE default "sfq" if DEFAULT_SFQ default "pfifo_fast" endif comment "Classification" config NET_CLS bool config NET_CLS_BASIC tristate "Elementary classification (BASIC)" select 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_ROUTE4 tristate "Routing decision (ROUTE)" depends on INET select IP_ROUTE_CLASSID select NET_CLS help If you say Y here, you will be able to classify packets according to the route table entry they matched. To compile this code as a module, choose M here: the module will be called cls_route. config NET_CLS_FW tristate "Netfilter mark (FW)" select NET_CLS help If you say Y here, you will be able to classify packets according to netfilter/firewall marks. To compile this code as a module, choose M here: the module will be called cls_fw. config NET_CLS_U32 tristate "Universal 32bit comparisons w/ hashing (U32)" select NET_CLS help Say Y here to be able to classify packets using a universal 32bit pieces based comparison scheme. To compile this code as a module, choose M here: the module will be called cls_u32. config CLS_U32_PERF bool "Performance counters support" depends on NET_CLS_U32 help Say Y here to make u32 gather additional statistics useful for fine tuning u32 classifiers. config CLS_U32_MARK bool "Netfilter marks support" depends on NET_CLS_U32 help Say Y here to be able to use netfilter marks as u32 key. config NET_CLS_FLOW tristate "Flow classifier" select NET_CLS help If you say Y here, you will be able to classify packets based on a configurable combination of packet keys. This is mostly useful in combination with SFQ. To compile this code as a module, choose M here: the module will be called cls_flow. config NET_CLS_CGROUP tristate "Control Group Classifier" select NET_CLS select CGROUP_NET_CLASSID depends on CGROUPS help Say Y here if you want to classify packets based on the control cgroup of their process. To compile this code as a module, choose M here: the module will be called cls_cgroup. config NET_CLS_BPF tristate "BPF-based classifier" select NET_CLS help If you say Y here, you will be able to classify packets based on programmable BPF (JIT'ed) filters as an alternative to ematches. To compile this code as a module, choose M here: the module will be called cls_bpf. config NET_CLS_FLOWER tristate "Flower classifier" select NET_CLS help If you say Y here, you will be able to classify packets based on a configurable combination of packet keys and masks. To compile this code as a module, choose M here: the module will be called cls_flower. config NET_CLS_MATCHALL tristate "Match-all classifier" select NET_CLS help If you say Y here, you will be able to classify packets based on nothing. Every packet will match. To compile this code as a module, choose M here: the module will be called cls_matchall. config NET_EMATCH bool "Extended Matches" select 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 for. A recent version of the iproute2 package is required 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 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 able 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 able 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_EMATCH_CANID tristate "CAN Identifier" depends on NET_EMATCH && (CAN=y || CAN=m) help Say Y here if you want to be able to classify CAN frames based on CAN Identifier. To compile this code as a module, choose M here: the module will be called em_canid. config NET_EMATCH_IPSET tristate "IPset" depends on NET_EMATCH && IP_SET help Say Y here if you want to be able to classify packets based on ipset membership. To compile this code as a module, choose M here: the module will be called em_ipset. config NET_EMATCH_IPT tristate "IPtables Matches" depends on NET_EMATCH && NETFILTER && NETFILTER_XTABLES help Say Y here to be able to classify packets based on iptables matches. Current supported match is "policy" which allows packet classification based on IPsec policy that was used during decapsulation To compile this code as a module, choose M here: the module will be called em_ipt. config NET_CLS_ACT bool "Actions" select NET_CLS help Say Y here if you want to use traffic control actions. Actions get attached to classifiers and are invoked after a successful classification. They are used to overwrite the classification result, instantly drop or redirect packets, etc. A recent version of the iproute2 package is required to use extended matches. config NET_ACT_POLICE tristate "Traffic Policing" depends on NET_CLS_ACT help Say Y here if you want to do traffic policing, i.e. strict bandwidth limiting. This action replaces the existing policing module. To compile this code as a module, choose M here: the module will be called act_police. config NET_ACT_GACT tristate "Generic actions" depends on NET_CLS_ACT help Say Y here to take generic actions such as dropping and accepting packets. To compile this code as a module, choose M here: the module will be called act_gact. config GACT_PROB bool "Probability support" depends on NET_ACT_GACT help Say Y here to use the generic action randomly or deterministically. config NET_ACT_MIRRED tristate "Redirecting and Mirroring" depends on NET_CLS_ACT help Say Y here to allow packets to be mirrored or redirected to other devices. To compile this code as a module, choose M here: the module will be called act_mirred. config NET_ACT_SAMPLE tristate "Traffic Sampling" depends on NET_CLS_ACT select PSAMPLE help Say Y here to allow packet sampling tc action. The packet sample action consists of statistically choosing packets and sampling them using the psample module. To compile this code as a module, choose M here: the module will be called act_sample. config NET_ACT_IPT tristate "IPtables targets" depends on NET_CLS_ACT && NETFILTER && NETFILTER_XTABLES help Say Y here to be able to invoke iptables targets after successful classification. To compile this code as a module, choose M here: the module will be called act_ipt. config NET_ACT_NAT tristate "Stateless NAT" depends on NET_CLS_ACT help Say Y here to do stateless NAT on IPv4 packets. You should use netfilter for NAT unless you know what you are doing. To compile this code as a module, choose M here: the module will be called act_nat. config NET_ACT_PEDIT tristate "Packet Editing" depends on NET_CLS_ACT help Say Y here if you want to mangle the content of packets. To compile this code as a module, choose M here: the module will be called act_pedit. config NET_ACT_SIMP tristate "Simple Example (Debug)" depends on NET_CLS_ACT help Say Y here to add a simple action for demonstration purposes. It is meant as an example and for debugging purposes. It will print a configured policy string followed by the packet count to the console for every packet that passes by. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_simple. config NET_ACT_SKBEDIT tristate "SKB Editing" depends on NET_CLS_ACT help Say Y here to change skb priority or queue_mapping settings. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_skbedit. config NET_ACT_CSUM tristate "Checksum Updating" depends on NET_CLS_ACT && INET select LIBCRC32C help Say Y here to update some common checksum after some direct packet alterations. To compile this code as a module, choose M here: the module will be called act_csum. config NET_ACT_MPLS tristate "MPLS manipulation" depends on NET_CLS_ACT help Say Y here to push or pop MPLS headers. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_mpls. config NET_ACT_VLAN tristate "Vlan manipulation" depends on NET_CLS_ACT help Say Y here to push or pop vlan headers. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_vlan. config NET_ACT_BPF tristate "BPF based action" depends on NET_CLS_ACT help Say Y here to execute BPF code on packets. The BPF code will decide if the packet should be dropped or not. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_bpf. config NET_ACT_CONNMARK tristate "Netfilter Connection Mark Retriever" depends on NET_CLS_ACT && NETFILTER depends on NF_CONNTRACK && NF_CONNTRACK_MARK help Say Y here to allow retrieving of conn mark If unsure, say N. To compile this code as a module, choose M here: the module will be called act_connmark. config NET_ACT_CTINFO tristate "Netfilter Connection Mark Actions" depends on NET_CLS_ACT && NETFILTER depends on NF_CONNTRACK && NF_CONNTRACK_MARK help Say Y here to allow transfer of a connmark stored information. Current actions transfer connmark stored DSCP into ipv4/v6 diffserv and/or to transfer connmark to packet mark. Both are useful for restoring egress based marks back onto ingress connections for qdisc priority mapping purposes. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_ctinfo. config NET_ACT_SKBMOD tristate "skb data modification action" depends on NET_CLS_ACT help Say Y here to allow modification of skb data If unsure, say N. To compile this code as a module, choose M here: the module will be called act_skbmod. config NET_ACT_IFE tristate "Inter-FE action based on IETF ForCES InterFE LFB" depends on NET_CLS_ACT select NET_IFE help Say Y here to allow for sourcing and terminating metadata For details refer to netdev01 paper: "Distributing Linux Traffic Control Classifier-Action Subsystem" Authors: Jamal Hadi Salim and Damascene M. Joachimpillai To compile this code as a module, choose M here: the module will be called act_ife. config NET_ACT_TUNNEL_KEY tristate "IP tunnel metadata manipulation" depends on NET_CLS_ACT help Say Y here to set/release ip tunnel metadata. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_tunnel_key. config NET_ACT_CT tristate "connection tracking tc action" depends on NET_CLS_ACT && NF_CONNTRACK && (!NF_NAT || NF_NAT) && NF_FLOW_TABLE help Say Y here to allow sending the packets to conntrack module. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_ct. config NET_ACT_GATE tristate "Frame gate entry list control tc action" depends on NET_CLS_ACT help Say Y here to allow to control the ingress flow to be passed at specific time slot and be dropped at other specific time slot by the gate entry list. If unsure, say N. To compile this code as a module, choose M here: the module will be called act_gate. config NET_IFE_SKBMARK tristate "Support to encoding decoding skb mark on IFE action" depends on NET_ACT_IFE config NET_IFE_SKBPRIO tristate "Support to encoding decoding skb prio on IFE action" depends on NET_ACT_IFE config NET_IFE_SKBTCINDEX tristate "Support to encoding decoding skb tcindex on IFE action" depends on NET_ACT_IFE config NET_TC_SKB_EXT bool "TC recirculation support" depends on NET_CLS_ACT select SKB_EXTENSIONS help Say Y here to allow tc chain misses to continue in OvS datapath in the correct recirc_id, and hardware chain misses to continue in the correct chain in tc software datapath. Say N here if you won't be using tc<->ovs offload or tc chains offload. endif # NET_SCHED config NET_SCH_FIFO bool
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