The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/netisr_internal.h

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    1 /*-
    2  * Copyright (c) 2007-2009 Robert N. M. Watson
    3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed by Robert N. M. Watson under contract
    7  * to Juniper Networks, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/9.0/sys/net/netisr_internal.h 222249 2011-05-24 12:34:19Z rwatson $
   31  */
   32 
   33 #ifndef _NET_NETISR_INTERNAL_H_
   34 #define _NET_NETISR_INTERNAL_H_
   35 
   36 #ifndef _WANT_NETISR_INTERNAL
   37 #error "no user-serviceable parts inside"
   38 #endif
   39 
   40 /*
   41  * These definitions are private to the netisr implementation, but provided
   42  * here for use by post-mortem crashdump analysis tools.  They should not be
   43  * used in any other context as they can and will change.  Public definitions
   44  * may be found in netisr.h.
   45  */
   46 
   47 #ifndef _KERNEL
   48 typedef void *netisr_handler_t;
   49 typedef void *netisr_m2flow_t;
   50 typedef void *netisr_m2cpuid_t;
   51 typedef void *netisr_drainedcpu_t;
   52 #endif
   53 
   54 /*
   55  * Each protocol is described by a struct netisr_proto, which holds all
   56  * global per-protocol information.  This data structure is set up by
   57  * netisr_register(), and derived from the public struct netisr_handler.
   58  */
   59 struct netisr_proto {
   60         const char      *np_name;       /* Character string protocol name. */
   61         netisr_handler_t *np_handler;   /* Protocol handler. */
   62         netisr_m2flow_t *np_m2flow;     /* Query flow for untagged packet. */
   63         netisr_m2cpuid_t *np_m2cpuid;   /* Query CPU to process packet on. */
   64         netisr_drainedcpu_t *np_drainedcpu; /* Callback when drained a queue. */
   65         u_int            np_qlimit;     /* Maximum per-CPU queue depth. */
   66         u_int            np_policy;     /* Work placement policy. */
   67         u_int            np_dispatch;   /* Work dispatch policy. */
   68 };
   69 
   70 #define NETISR_MAXPROT  16              /* Compile-time limit. */
   71 
   72 /*
   73  * Protocol-specific work for each workstream is described by struct
   74  * netisr_work.  Each work descriptor consists of an mbuf queue and
   75  * statistics.
   76  */
   77 struct netisr_work {
   78         /*
   79          * Packet queue, linked by m_nextpkt.
   80          */
   81         struct mbuf     *nw_head;
   82         struct mbuf     *nw_tail;
   83         u_int            nw_len;
   84         u_int            nw_qlimit;
   85         u_int            nw_watermark;
   86 
   87         /*
   88          * Statistics -- written unlocked, but mostly from curcpu.
   89          */
   90         u_int64_t        nw_dispatched; /* Number of direct dispatches. */
   91         u_int64_t        nw_hybrid_dispatched; /* "" hybrid dispatches. */
   92         u_int64_t        nw_qdrops;     /* "" drops. */
   93         u_int64_t        nw_queued;     /* "" enqueues. */
   94         u_int64_t        nw_handled;    /* "" handled in worker. */
   95 };
   96 
   97 /*
   98  * Workstreams hold a queue of ordered work across each protocol, and are
   99  * described by netisr_workstream.  Each workstream is associated with a
  100  * worker thread, which in turn is pinned to a CPU.  Work associated with a
  101  * workstream can be processd in other threads during direct dispatch;
  102  * concurrent processing is prevented by the NWS_RUNNING flag, which
  103  * indicates that a thread is already processing the work queue.  It is
  104  * important to prevent a directly dispatched packet from "skipping ahead" of
  105  * work already in the workstream queue.
  106  */
  107 struct netisr_workstream {
  108         struct intr_event *nws_intr_event;      /* Handler for stream. */
  109         void            *nws_swi_cookie;        /* swi(9) cookie for stream. */
  110         struct mtx       nws_mtx;               /* Synchronize work. */
  111         u_int            nws_cpu;               /* CPU pinning. */
  112         u_int            nws_flags;             /* Wakeup flags. */
  113         u_int            nws_pendingbits;       /* Scheduled protocols. */
  114 
  115         /*
  116          * Each protocol has per-workstream data.
  117          */
  118         struct netisr_work      nws_work[NETISR_MAXPROT];
  119 } __aligned(CACHE_LINE_SIZE);
  120 
  121 /*
  122  * Per-workstream flags.
  123  */
  124 #define NWS_RUNNING     0x00000001      /* Currently running in a thread. */
  125 #define NWS_DISPATCHING 0x00000002      /* Currently being direct-dispatched. */
  126 #define NWS_SCHEDULED   0x00000004      /* Signal issued. */
  127 
  128 #endif /* !_NET_NETISR_INTERNAL_H_ */

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