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linux-2.6/drivers/staging/octeon/ethernet-rx.h
David Daney 3368c784bc Staging: Octeon Ethernet: Convert to NAPI.
Convert the driver to be a reasonably well behaved NAPI citizen.

There is one NAPI instance per CPU shared between all input ports.  As
receive backlog increases, NAPI is scheduled on additional CPUs.

Receive buffer refill code factored out so it can also be called from
the periodic timer.  This is needed to recover from temporary buffer
starvation conditions.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
To: gregkh@suse.de
Patchwork: http://patchwork.linux-mips.org/patch/839/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-02-27 12:53:08 +01:00

53 lines
1.8 KiB
C

/*********************************************************************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2007 Cavium Networks
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
*********************************************************************/
#include "cvmx-fau.h"
void cvm_oct_poll_controller(struct net_device *dev);
void cvm_oct_rx_initialize(void);
void cvm_oct_rx_shutdown(void);
static inline void cvm_oct_rx_refill_pool(int fill_threshold)
{
int number_to_free;
int num_freed;
/* Refill the packet buffer pool */
number_to_free =
cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
if (number_to_free > fill_threshold) {
cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
-number_to_free);
num_freed = cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL,
CVMX_FPA_PACKET_POOL_SIZE,
number_to_free);
if (num_freed != number_to_free) {
cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
number_to_free - num_freed);
}
}
}