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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-10-09 22:42:09 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-10-10 09:06:58 +0200 |
commit | bceabc95c1c85d793200446fa85f1ddc6313ea29 (patch) | |
tree | 973c8bd8deca9fd69913f2895cc91e0e6114d46c /freebsd/sys/net/netisr.h | |
parent | Add FreeBSD sources as a submodule (diff) | |
download | rtems-libbsd-bceabc95c1c85d793200446fa85f1ddc6313ea29.tar.bz2 |
Move files to match FreeBSD layout
Diffstat (limited to 'freebsd/sys/net/netisr.h')
-rw-r--r-- | freebsd/sys/net/netisr.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/freebsd/sys/net/netisr.h b/freebsd/sys/net/netisr.h new file mode 100644 index 00000000..b755332a --- /dev/null +++ b/freebsd/sys/net/netisr.h @@ -0,0 +1,156 @@ +/*- + * Copyright (c) 2007-2009 Robert N. M. Watson + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _NET_NETISR_HH_ +#define _NET_NETISR_HH_ +#ifdef _KERNEL + +/* + * The netisr (network interrupt service routine) provides a deferred + * execution evironment in which (generally inbound) network processing can + * take place. Protocols register handlers which will be executed directly, + * or via deferred dispatch, depending on the circumstances. + * + * Historically, this was implemented by the BSD software ISR facility; it is + * now implemented via a software ithread (SWI). + */ +#define NETISR_IP 1 +#define NETISR_IGMP 2 /* IGMPv3 output queue */ +#define NETISR_ROUTE 3 /* routing socket */ +#define NETISR_AARP 4 /* Appletalk ARP */ +#define NETISR_ATALK2 5 /* Appletalk phase 2 */ +#define NETISR_ATALK1 6 /* Appletalk phase 1 */ +#define NETISR_ARP 7 /* same as AF_LINK */ +#define NETISR_IPX 8 /* same as AF_IPX */ +#define NETISR_ETHER 9 /* ethernet input */ +#define NETISR_IPV6 10 +#define NETISR_NATM 11 +#define NETISR_EPAIR 12 /* if_epair(4) */ + +/*- + * Protocols express ordering constraints and affinity preferences by + * implementing one or neither of nh_m2flow and nh_m2cpuid, which are used by + * netisr to determine which per-CPU workstream to assign mbufs to. + * + * The following policies may be used by protocols: + * + * NETISR_POLICY_SOURCE - netisr should maintain source ordering without + * advice from the protocol. netisr will ignore any + * flow IDs present on the mbuf for the purposes of + * work placement. + * + * NETISR_POLICY_FLOW - netisr should maintain flow ordering as defined by + * the mbuf header flow ID field. If the protocol + * implements nh_m2flow, then netisr will query the + * protocol in the event that the mbuf doesn't have a + * flow ID, falling back on source ordering. + * + * NETISR_POLICY_CPU - netisr will delegate all work placement decisions to + * the protocol, querying nh_m2cpuid for each packet. + * + * Protocols might make decisions about work placement based on an existing + * calculated flow ID on the mbuf, such as one provided in hardware, the + * receive interface pointed to by the mbuf (if any), the optional source + * identifier passed at some dispatch points, or even parse packet headers to + * calculate a flow. Both protocol handlers may return a new mbuf pointer + * for the chain, or NULL if the packet proves invalid or m_pullup() fails. + * + * XXXRW: If we eventually support dynamic reconfiguration, there should be + * protocol handlers to notify them of CPU configuration changes so that they + * can rebalance work. + */ +struct mbuf; +typedef void netisr_handler_t(struct mbuf *m); +typedef struct mbuf *netisr_m2cpuid_t(struct mbuf *m, uintptr_t source, + u_int *cpuid); +typedef struct mbuf *netisr_m2flow_t(struct mbuf *m, uintptr_t source); +typedef void netisr_drainedcpu_t(u_int cpuid); + +#define NETISR_POLICY_SOURCE 1 /* Maintain source ordering. */ +#define NETISR_POLICY_FLOW 2 /* Maintain flow ordering. */ +#define NETISR_POLICY_CPU 3 /* Protocol determines CPU placement. */ + +/* + * Data structure describing a protocol handler. + */ +struct netisr_handler { + const char *nh_name; /* Character string protocol name. */ + netisr_handler_t *nh_handler; /* Protocol handler. */ + netisr_m2flow_t *nh_m2flow; /* Query flow for untagged packet. */ + netisr_m2cpuid_t *nh_m2cpuid; /* Query CPU to process mbuf on. */ + netisr_drainedcpu_t *nh_drainedcpu; /* Callback when drained a queue. */ + u_int nh_proto; /* Integer protocol ID. */ + u_int nh_qlimit; /* Maximum per-CPU queue depth. */ + u_int nh_policy; /* Work placement policy. */ + u_int nh_ispare[5]; /* For future use. */ + void *nh_pspare[4]; /* For future use. */ +}; + +/* + * Register, unregister, and other netisr handler management functions. + */ +void netisr_clearqdrops(const struct netisr_handler *nhp); +void netisr_getqdrops(const struct netisr_handler *nhp, + u_int64_t *qdropsp); +void netisr_getqlimit(const struct netisr_handler *nhp, u_int *qlimitp); +void netisr_register(const struct netisr_handler *nhp); +int netisr_setqlimit(const struct netisr_handler *nhp, u_int qlimit); +void netisr_unregister(const struct netisr_handler *nhp); + +/* + * Process a packet destined for a protocol, and attempt direct dispatch. + * Supplemental source ordering information can be passed using the _src + * variant. + */ +int netisr_dispatch(u_int proto, struct mbuf *m); +int netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m); +int netisr_queue(u_int proto, struct mbuf *m); +int netisr_queue_src(u_int proto, uintptr_t source, struct mbuf *m); + +/* + * Provide a default implementation of "map an ID to a CPU ID". + */ +u_int netisr_default_flow2cpu(u_int flowid); + +/* + * Utility routines to return the number of CPUs participting in netisr, and + * to return a mapping from a number to a CPU ID that can be used with the + * scheduler. + */ +u_int netisr_get_cpucount(void); +u_int netisr_get_cpuid(u_int cpunumber); + +/* + * Interfaces between DEVICE_POLLING and netisr. + */ +void netisr_sched_poll(void); +void netisr_poll(void); +void netisr_pollmore(void); + +#endif /* !_KERNEL */ +#endif /* !_NET_NETISR_HH_ */ |