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248 lines
9.2 KiB
C
248 lines
9.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2007-2009 Robert N. M. Watson
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* Copyright (c) 2010-2011 Juniper Networks, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson under contract
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* to Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NET_NETISR_H_
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#define _NET_NETISR_H_
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/*
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* The netisr (network interrupt service routine) provides a deferred
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* execution evironment in which (generally inbound) network processing can
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* take place. Protocols register handlers which will be executed directly,
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* or via deferred dispatch, depending on the circumstances.
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*
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* Historically, this was implemented by the BSD software ISR facility; it is
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* now implemented via a software ithread (SWI).
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*/
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/*
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* Protocol numbers, which are encoded in monitoring applications and kernel
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* modules. Internally, these are used in bit shift operations so must have
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* a value 0 < proto < 32; we currently further limit at compile-time to 16
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* for array-sizing purposes.
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*/
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#define NETISR_IP 1
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#define NETISR_IGMP 2 /* IGMPv3 output queue */
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#define NETISR_ROUTE 3 /* routing socket */
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#define NETISR_ARP 4 /* same as AF_LINK */
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#define NETISR_ETHER 5 /* ethernet input */
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#define NETISR_IPV6 6
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#define NETISR_IP_DIRECT 9 /* direct-dispatch IPv4 */
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#define NETISR_IPV6_DIRECT 10 /* direct-dispatch IPv6 */
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/*
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* Protocol ordering and affinity policy constants. See the detailed
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* discussion of policies later in the file.
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*/
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#define NETISR_POLICY_SOURCE 1 /* Maintain source ordering. */
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#define NETISR_POLICY_FLOW 2 /* Maintain flow ordering. */
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#define NETISR_POLICY_CPU 3 /* Protocol determines CPU placement. */
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/*
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* Protocol dispatch policy constants; selects whether and when direct
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* dispatch is permitted.
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*/
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#define NETISR_DISPATCH_DEFAULT 0 /* Use global default. */
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#define NETISR_DISPATCH_DEFERRED 1 /* Always defer dispatch. */
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#define NETISR_DISPATCH_HYBRID 2 /* Allow hybrid dispatch. */
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#define NETISR_DISPATCH_DIRECT 3 /* Always direct dispatch. */
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/*
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* Monitoring data structures, exported by sysctl(2).
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*
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* Three sysctls are defined. First, a per-protocol structure exported by
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* net.isr.proto.
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*/
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#define NETISR_NAMEMAXLEN 32
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struct sysctl_netisr_proto {
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u_int snp_version; /* Length of struct. */
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char snp_name[NETISR_NAMEMAXLEN]; /* nh_name */
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u_int snp_proto; /* nh_proto */
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u_int snp_qlimit; /* nh_qlimit */
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u_int snp_policy; /* nh_policy */
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u_int snp_flags; /* Various flags. */
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u_int snp_dispatch; /* Dispatch policy. */
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u_int _snp_ispare[6];
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};
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/*
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* Flags for sysctl_netisr_proto.snp_flags.
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*/
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#define NETISR_SNP_FLAGS_M2FLOW 0x00000001 /* nh_m2flow */
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#define NETISR_SNP_FLAGS_M2CPUID 0x00000002 /* nh_m2cpuid */
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#define NETISR_SNP_FLAGS_DRAINEDCPU 0x00000004 /* nh_drainedcpu */
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/*
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* Next, a structure per-workstream, with per-protocol data, exported as
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* net.isr.workstream.
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*/
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struct sysctl_netisr_workstream {
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u_int snws_version; /* Length of struct. */
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u_int snws_flags; /* Various flags. */
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u_int snws_wsid; /* Workstream ID. */
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u_int snws_cpu; /* nws_cpu */
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u_int _snws_ispare[12];
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};
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/*
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* Flags for sysctl_netisr_workstream.snws_flags
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*/
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#define NETISR_SNWS_FLAGS_INTR 0x00000001 /* nws_intr_event */
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/*
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* Finally, a per-workstream-per-protocol structure, exported as
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* net.isr.work.
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*/
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struct sysctl_netisr_work {
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u_int snw_version; /* Length of struct. */
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u_int snw_wsid; /* Workstream ID. */
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u_int snw_proto; /* Protocol number. */
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u_int snw_len; /* nw_len */
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u_int snw_watermark; /* nw_watermark */
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u_int _snw_ispare[3];
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uint64_t snw_dispatched; /* nw_dispatched */
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uint64_t snw_hybrid_dispatched; /* nw_hybrid_dispatched */
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uint64_t snw_qdrops; /* nw_qdrops */
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uint64_t snw_queued; /* nw_queued */
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uint64_t snw_handled; /* nw_handled */
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uint64_t _snw_llspare[7];
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};
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#ifdef _KERNEL
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/*-
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* Protocols express ordering constraints and affinity preferences by
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* implementing one or neither of nh_m2flow and nh_m2cpuid, which are used by
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* netisr to determine which per-CPU workstream to assign mbufs to.
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*
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* The following policies may be used by protocols:
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*
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* NETISR_POLICY_SOURCE - netisr should maintain source ordering without
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* advice from the protocol. netisr will ignore any
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* flow IDs present on the mbuf for the purposes of
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* work placement.
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*
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* NETISR_POLICY_FLOW - netisr should maintain flow ordering as defined by
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* the mbuf header flow ID field. If the protocol
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* implements nh_m2flow, then netisr will query the
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* protocol in the event that the mbuf doesn't have a
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* flow ID, falling back on source ordering.
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*
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* NETISR_POLICY_CPU - netisr will delegate all work placement decisions to
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* the protocol, querying nh_m2cpuid for each packet.
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*
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* Protocols might make decisions about work placement based on an existing
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* calculated flow ID on the mbuf, such as one provided in hardware, the
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* receive interface pointed to by the mbuf (if any), the optional source
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* identifier passed at some dispatch points, or even parse packet headers to
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* calculate a flow. Both protocol handlers may return a new mbuf pointer
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* for the chain, or NULL if the packet proves invalid or m_pullup() fails.
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*
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* XXXRW: If we eventually support dynamic reconfiguration, there should be
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* protocol handlers to notify them of CPU configuration changes so that they
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* can rebalance work.
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*/
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struct mbuf;
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typedef void netisr_handler_t(struct mbuf *m);
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typedef struct mbuf *netisr_m2cpuid_t(struct mbuf *m, uintptr_t source,
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u_int *cpuid);
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typedef struct mbuf *netisr_m2flow_t(struct mbuf *m, uintptr_t source);
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typedef void netisr_drainedcpu_t(u_int cpuid);
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#define NETISR_CPUID_NONE ((u_int)-1) /* No affinity returned. */
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/*
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* Data structure describing a protocol handler.
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*/
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struct netisr_handler {
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const char *nh_name; /* Character string protocol name. */
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netisr_handler_t *nh_handler; /* Protocol handler. */
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netisr_m2flow_t *nh_m2flow; /* Query flow for untagged packet. */
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netisr_m2cpuid_t *nh_m2cpuid; /* Query CPU to process mbuf on. */
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netisr_drainedcpu_t *nh_drainedcpu; /* Callback when drained a queue. */
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u_int nh_proto; /* Integer protocol ID. */
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u_int nh_qlimit; /* Maximum per-CPU queue depth. */
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u_int nh_policy; /* Work placement policy. */
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u_int nh_dispatch; /* Dispatch policy. */
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u_int nh_ispare[4]; /* For future use. */
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void *nh_pspare[4]; /* For future use. */
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};
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/*
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* Register, unregister, and other netisr handler management functions.
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*/
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void netisr_clearqdrops(const struct netisr_handler *nhp);
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void netisr_getqdrops(const struct netisr_handler *nhp,
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u_int64_t *qdropsp);
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void netisr_getqlimit(const struct netisr_handler *nhp, u_int *qlimitp);
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void netisr_register(const struct netisr_handler *nhp);
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int netisr_setqlimit(const struct netisr_handler *nhp, u_int qlimit);
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void netisr_unregister(const struct netisr_handler *nhp);
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#ifdef VIMAGE
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void netisr_register_vnet(const struct netisr_handler *nhp);
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void netisr_unregister_vnet(const struct netisr_handler *nhp);
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#endif
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/*
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* Process a packet destined for a protocol, and attempt direct dispatch.
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* Supplemental source ordering information can be passed using the _src
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* variant.
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*/
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int netisr_dispatch(u_int proto, struct mbuf *m);
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int netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m);
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int netisr_queue(u_int proto, struct mbuf *m);
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int netisr_queue_src(u_int proto, uintptr_t source, struct mbuf *m);
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/*
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* Provide a default implementation of "map an ID to a CPU ID".
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*/
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u_int netisr_default_flow2cpu(u_int flowid);
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/*
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* Utility routines to return the number of CPUs participting in netisr, and
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* to return a mapping from a number to a CPU ID that can be used with the
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* scheduler.
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*/
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u_int netisr_get_cpucount(void);
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u_int netisr_get_cpuid(u_int cpunumber);
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/*
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* Interfaces between DEVICE_POLLING and netisr.
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*/
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void netisr_sched_poll(void);
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void netisr_poll(void);
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void netisr_pollmore(void);
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#endif /* !_KERNEL */
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#endif /* !_NET_NETISR_H_ */
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