FreeBSD/Linux Kernel Cross Reference
sys/dev/netmap/netmap_null.c

     /*
      * Copyright (C) 2018 Giuseppe Lettieri
      * 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.
     */
    /* $FreeBSD$ */
    
    #if defined(__FreeBSD__)
    #include <sys/cdefs.h> /* prerequisite */
    
    #include <sys/types.h>
    #include <sys/errno.h>
    #include <sys/param.h>  /* defines used in kernel.h */
    #include <sys/kernel.h> /* types used in module initialization */
    #include <sys/malloc.h>
    #include <sys/poll.h>
    #include <sys/lock.h>
    #include <sys/rwlock.h>
    #include <sys/selinfo.h>
    #include <sys/sysctl.h>
    #include <sys/socket.h> /* sockaddrs */
    #include <net/if.h>
    #include <net/if_var.h>
    #include <machine/bus.h>        /* bus_dmamap_* */
    #include <sys/refcount.h>
    
    
    #elif defined(linux)
    
    #include "bsd_glue.h"
    
    #elif defined(__APPLE__)
    
    #warning OSX support is only partial
    #include "osx_glue.h"
    
    #elif defined(_WIN32)
    #include "win_glue.h"
    
    #else
    
    #error  Unsupported platform
    
    #endif /* unsupported */
    
    /*
     * common headers
     */
    
    #include <net/netmap.h>
    #include <dev/netmap/netmap_kern.h>
    #include <dev/netmap/netmap_mem2.h>
    
    #ifdef WITH_NMNULL
    
    static int
    netmap_null_sync(struct netmap_kring *kring, int flags)
    {
            (void)kring;
            (void)flags;
            return 0;
    }
    
    static int
    netmap_null_krings_create(struct netmap_adapter *na)
    {
            return netmap_krings_create(na, 0);
    }
    
    static int
    netmap_null_reg(struct netmap_adapter *na, int onoff)
    {
            if (na->active_fds == 0) {
                    if (onoff)
                            na->na_flags |= NAF_NETMAP_ON;
                    else
                            na->na_flags &= ~NAF_NETMAP_ON;
            }
            return 0;
   }
   
   static int
   netmap_null_bdg_attach(const char *name, struct netmap_adapter *na,
                   struct nm_bridge *b)
   {
           (void)name;
           (void)na;
           (void)b;
           return EINVAL;
   }
   
   int
   netmap_get_null_na(struct nmreq_header *hdr, struct netmap_adapter **na,
                   struct netmap_mem_d *nmd, int create)
   {
           struct nmreq_register *req = (struct nmreq_register *)(uintptr_t)hdr->nr_body;
           struct netmap_null_adapter *nna;
           int error;
   
           if (req->nr_mode != NR_REG_NULL) {
                   nm_prdis("not a null port");
                   return 0;
           }
   
           if (!create) {
                   nm_prerr("null ports cannot be re-opened");
                   return EINVAL;
           }
   
           if (nmd == NULL) {
                   nm_prerr("null ports must use an existing allocator");
                   return EINVAL;
           }
   
           nna = nm_os_malloc(sizeof(*nna));
           if (nna == NULL) {
                   error = ENOMEM;
                   goto err;
           }
           snprintf(nna->up.name, sizeof(nna->up.name), "null:%s", hdr->nr_name);
   
           nna->up.nm_txsync = netmap_null_sync;
           nna->up.nm_rxsync = netmap_null_sync;
           nna->up.nm_register = netmap_null_reg;
           nna->up.nm_krings_create = netmap_null_krings_create;
           nna->up.nm_krings_delete = netmap_krings_delete;
           nna->up.nm_bdg_attach = netmap_null_bdg_attach;
           nna->up.nm_mem = netmap_mem_get(nmd);
   
           nna->up.num_tx_rings = req->nr_tx_rings;
           nna->up.num_rx_rings = req->nr_rx_rings;
           nna->up.num_tx_desc = req->nr_tx_slots;
           nna->up.num_rx_desc = req->nr_rx_slots;
           nna->up.na_flags = NAF_OFFSETS;
           error = netmap_attach_common(&nna->up);
           if (error)
                   goto free_nna;
           *na = &nna->up;
           netmap_adapter_get(*na);
           nm_prdis("created null %s", nna->up.name);
   
           return 0;
   
   free_nna:
           nm_os_free(nna);
   err:
           return error;
   }
   
   
   #endif /* WITH_NMNULL */

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