text: /*
   * 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_txsync(struct netmap_kring *kring, int flags)
  {
  	(void)kring;
  	(void)flags;
  	return 0;
  }
  
  static int
  netmap_null_rxsync(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 void
  netmap_null_krings_delete(struct netmap_adapter *na)
  {
  	netmap_krings_delete(na);
  }
  
  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_txsync;
  	nna->up.nm_rxsync = netmap_null_rxsync;
  	nna->up.nm_register = netmap_null_reg;
  	nna->up.nm_krings_create = netmap_null_krings_create;
  	nna->up.nm_krings_delete = netmap_null_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;
  	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 */
  