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

     /*
      * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. 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 ``S 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_NETMAP_LEGACY_H_
    #define _NET_NETMAP_LEGACY_H_
    
    /*
     * ioctl names and related fields
     *
     * NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
     *      whose identity is set in NIOCREGIF through nr_ringid.
     *      These are non blocking and take no argument.
     *
     * NIOCGINFO takes a struct ifreq, the interface name is the input,
     *      the outputs are number of queues and number of descriptor
     *      for each queue (useful to set number of threads etc.).
     *      The info returned is only advisory and may change before
     *      the interface is bound to a file descriptor.
     *
     * NIOCREGIF takes an interface name within a struct nmre,
     *      and activates netmap mode on the interface (if possible).
     *
     * The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we
     * can pass it down to other NIC-related ioctls.
     *
     * The actual argument (struct nmreq) has a number of options to request
     * different functions.
     * The following are used in NIOCREGIF when nr_cmd == 0:
     *
     * nr_name      (in)
     *      The name of the port (em0, valeXXX:YYY, etc.)
     *      limited to IFNAMSIZ for backward compatibility.
     *
     * nr_version   (in/out)
     *      Must match NETMAP_API as used in the kernel, error otherwise.
     *      Always returns the desired value on output.
     *
     * nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out)
     *      On input, non-zero values may be used to reconfigure the port
     *      according to the requested values, but this is not guaranteed.
     *      On output the actual values in use are reported.
     *
     * nr_ringid (in)
     *      Indicates how rings should be bound to the file descriptors.
     *      If nr_flags != 0, then the low bits (in NETMAP_RING_MASK)
     *      are used to indicate the ring number, and nr_flags specifies
     *      the actual rings to bind. NETMAP_NO_TX_POLL is unaffected.
     *
     *      NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED:
     *      If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control
     *      the binding as follows:
     *      0 (default)                     binds all physical rings
     *      NETMAP_HW_RING | ring number    binds a single ring pair
     *      NETMAP_SW_RING                  binds only the host tx/rx rings
     *
     *      NETMAP_NO_TX_POLL can be OR-ed to make select()/poll() push
     *              packets on tx rings only if POLLOUT is set.
     *              The default is to push any pending packet.
     *
     *      NETMAP_DO_RX_POLL can be OR-ed to make select()/poll() release
     *              packets on rx rings also when POLLIN is NOT set.
     *              The default is to touch the rx ring only with POLLIN.
     *              Note that this is the opposite of TX because it
     *              reflects the common usage.
     *
     *      NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead.
     *      NETMAP_PRIV_MEM is set on return for ports that do not use
     *              the global memory allocator.
     *              This information is not significant and applications
     *              should look at the region id in nr_arg2
     *
     * nr_flags     is the recommended mode to indicate which rings should
     *              be bound to a file descriptor. Values are NR_REG_*
     *
     * nr_arg1 (in) The number of extra rings to be reserved.
    *              Especially when allocating a VALE port the system only
    *              allocates the amount of memory needed for the port.
    *              If more shared memory rings are desired (e.g. for pipes),
    *              the first invocation for the same basename/allocator
    *              should specify a suitable number. Memory cannot be
    *              extended after the first allocation without closing
    *              all ports on the same region.
    *
    * nr_arg2 (in/out) The identity of the memory region used.
    *              On input, 0 means the system decides autonomously,
    *              other values may try to select a specific region.
    *              On return the actual value is reported.
    *              Region '1' is the global allocator, normally shared
    *              by all interfaces. Other values are private regions.
    *              If two ports the same region zero-copy is possible.
    *
    * nr_arg3 (in/out)     number of extra buffers to be allocated.
    *
    *
    *
    * nr_cmd (in)  if non-zero indicates a special command:
    *      NETMAP_BDG_ATTACH        and nr_name = vale*:ifname
    *              attaches the NIC to the switch; nr_ringid specifies
    *              which rings to use. Used by vale-ctl -a ...
    *          nr_arg1 = NETMAP_BDG_HOST also attaches the host port
    *              as in vale-ctl -h ...
    *
    *      NETMAP_BDG_DETACH       and nr_name = vale*:ifname
    *              disconnects a previously attached NIC.
    *              Used by vale-ctl -d ...
    *
    *      NETMAP_BDG_LIST
    *              list the configuration of VALE switches.
    *
    *      NETMAP_BDG_VNET_HDR
    *              Set the virtio-net header length used by the client
    *              of a VALE switch port.
    *
    *      NETMAP_BDG_NEWIF
    *              create a persistent VALE port with name nr_name.
    *              Used by vale-ctl -n ...
    *
    *      NETMAP_BDG_DELIF
    *              delete a persistent VALE port. Used by vale-ctl -d ...
    *
    * nr_arg1, nr_arg2, nr_arg3  (in/out)          command specific
    *
    *
    *
    */
   
   
   /*
    * struct nmreq overlays a struct ifreq (just the name)
    */
   struct nmreq {
           char            nr_name[IFNAMSIZ];
           uint32_t        nr_version;     /* API version */
           uint32_t        nr_offset;      /* nifp offset in the shared region */
           uint32_t        nr_memsize;     /* size of the shared region */
           uint32_t        nr_tx_slots;    /* slots in tx rings */
           uint32_t        nr_rx_slots;    /* slots in rx rings */
           uint16_t        nr_tx_rings;    /* number of tx rings */
           uint16_t        nr_rx_rings;    /* number of rx rings */
   
           uint16_t        nr_ringid;      /* ring(s) we care about */
   #define NETMAP_HW_RING          0x4000  /* single NIC ring pair */
   #define NETMAP_SW_RING          0x2000  /* only host ring pair */
   
   #define NETMAP_RING_MASK        0x0fff  /* the ring number */
   
   #define NETMAP_NO_TX_POLL       0x1000  /* no automatic txsync on poll */
   
   #define NETMAP_DO_RX_POLL       0x8000  /* DO automatic rxsync on poll */
   
           uint16_t        nr_cmd;
   #define NETMAP_BDG_ATTACH       1       /* attach the NIC */
   #define NETMAP_BDG_DETACH       2       /* detach the NIC */
   #define NETMAP_BDG_REGOPS       3       /* register bridge callbacks */
   #define NETMAP_BDG_LIST         4       /* get bridge's info */
   #define NETMAP_BDG_VNET_HDR     5       /* set the port virtio-net-hdr length */
   #define NETMAP_BDG_NEWIF        6       /* create a virtual port */
   #define NETMAP_BDG_DELIF        7       /* destroy a virtual port */
   #define NETMAP_PT_HOST_CREATE   8       /* create ptnetmap kthreads */
   #define NETMAP_PT_HOST_DELETE   9       /* delete ptnetmap kthreads */
   #define NETMAP_BDG_POLLING_ON   10      /* delete polling kthread */
   #define NETMAP_BDG_POLLING_OFF  11      /* delete polling kthread */
   #define NETMAP_VNET_HDR_GET     12      /* get the port virtio-net-hdr length */
           uint16_t        nr_arg1;        /* reserve extra rings in NIOCREGIF */
   #define NETMAP_BDG_HOST         1       /* nr_arg1 value for NETMAP_BDG_ATTACH */
   
           uint16_t        nr_arg2;        /* id of the memory allocator */
           uint32_t        nr_arg3;        /* req. extra buffers in NIOCREGIF */
           uint32_t        nr_flags;       /* specify NR_REG_* mode and other flags */
   #define NR_REG_MASK             0xf /* to extract NR_REG_* mode from nr_flags */
           /* various modes, extends nr_ringid */
           uint32_t        spare2[1];
   };
   
   #ifdef _WIN32
   /*
    * Windows does not have _IOWR(). _IO(), _IOW() and _IOR() are defined
    * in ws2def.h but not sure if they are in the form we need.
    * We therefore redefine them in a convenient way to use for DeviceIoControl
    * signatures.
    */
   #undef _IO      // ws2def.h
   #define _WIN_NM_IOCTL_TYPE 40000
   #define _IO(_c, _n)     CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
                   METHOD_BUFFERED, FILE_ANY_ACCESS  )
   #define _IO_direct(_c, _n)      CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
                   METHOD_OUT_DIRECT, FILE_ANY_ACCESS  )
   
   #define _IOWR(_c, _n, _s)       _IO(_c, _n)
   
   /* We havesome internal sysctl in addition to the externally visible ones */
   #define NETMAP_MMAP _IO_direct('i', 160)        // note METHOD_OUT_DIRECT
   #define NETMAP_POLL _IO('i', 162)
   
   /* and also two setsockopt for sysctl emulation */
   #define NETMAP_SETSOCKOPT _IO('i', 140)
   #define NETMAP_GETSOCKOPT _IO('i', 141)
   
   
   /* These linknames are for the Netmap Core Driver */
   #define NETMAP_NT_DEVICE_NAME                   L"\\Device\\NETMAP"
   #define NETMAP_DOS_DEVICE_NAME                  L"\\DosDevices\\netmap"
   
   /* Definition of a structure used to pass a virtual address within an IOCTL */
   typedef struct _MEMORY_ENTRY {
           PVOID       pUsermodeVirtualAddress;
   } MEMORY_ENTRY, *PMEMORY_ENTRY;
   
   typedef struct _POLL_REQUEST_DATA {
           int events;
           int timeout;
           int revents;
   } POLL_REQUEST_DATA;
   #endif /* _WIN32 */
   
   /*
    * Opaque structure that is passed to an external kernel
    * module via ioctl(fd, NIOCCONFIG, req) for a user-owned
    * bridge port (at this point ephemeral VALE interface).
    */
   #define NM_IFRDATA_LEN 256
   struct nm_ifreq {
           char nifr_name[IFNAMSIZ];
           char data[NM_IFRDATA_LEN];
   };
   
   /*
    * FreeBSD uses the size value embedded in the _IOWR to determine
    * how much to copy in/out. So we need it to match the actual
    * data structure we pass. We put some spares in the structure
    * to ease compatibility with other versions
    */
   #define NIOCGINFO       _IOWR('i', 145, struct nmreq) /* return IF info */
   #define NIOCREGIF       _IOWR('i', 146, struct nmreq) /* interface register */
   #define NIOCCONFIG      _IOWR('i',150, struct nm_ifreq) /* for ext. modules */
   
   #endif /* _NET_NETMAP_LEGACY_H_ */

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