include/net/netdma.h

   1 /*
   2  * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called COPYING.
  20  */
  21 #ifndef NETDMA_H
  22 #define NETDMA_H
  23 #include <linux/config.h>
  24 #ifdef CONFIG_NET_DMA
  25 #include <linux/dmaengine.h>
  26
  27 static inline struct dma_chan *get_softnet_dma(void)
  28 {
  29         struct dma_chan *chan;
  30         rcu_read_lock();
  31         chan = rcu_dereference(__get_cpu_var(softnet_data.net_dma));
  32         if (chan)
  33                 dma_chan_get(chan);
  34         rcu_read_unlock();
  35         return chan;
  36 }
  37 #endif /* CONFIG_NET_DMA */
  38 #endif /* NETDMA_H */