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[I/OAT]: Setup the networking subsystem as a DMA client

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Attempts to allocate per-CPU DMA channels

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Leech
2006-06-17 21:24:58 -07:00
committed by David S. Miller
parent 57c651f74c
commit db21733488
4 changed files with 158 additions and 0 deletions
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include/net/netdma.h
+38
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/*
* Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called COPYING.
*/
#ifndef NETDMA_H
#define NETDMA_H
#include <linux/config.h>
#ifdef CONFIG_NET_DMA
#include <linux/dmaengine.h>
static inline struct dma_chan *get_softnet_dma(void)
{
struct dma_chan *chan;
rcu_read_lock();
chan = rcu_dereference(__get_cpu_var(softnet_data.net_dma));
if (chan)
dma_chan_get(chan);
rcu_read_unlock();
return chan;
}
#endif /* CONFIG_NET_DMA */
#endif /* NETDMA_H */