drivers/staging/octeon/ethernet-rx.h

   1 /*********************************************************************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2007 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26 *********************************************************************/
  27 #include "cvmx-fau.h"
  28
  29 void cvm_oct_poll_controller(struct net_device *dev);
  30 void cvm_oct_rx_initialize(void);
  31 void cvm_oct_rx_shutdown(void);
  32
  33 static inline void cvm_oct_rx_refill_pool(int fill_threshold)
  34 {
  35         int number_to_free;
  36         int num_freed;
  37         /* Refill the packet buffer pool */
  38         number_to_free =
  39                 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
  40
  41         if (number_to_free > fill_threshold) {
  42                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
  43                                       -number_to_free);
  44                 num_freed = cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL,
  45                                                  CVMX_FPA_PACKET_POOL_SIZE,
  46                                                  number_to_free);
  47                 if (num_freed != number_to_free) {
  48                         cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
  49                                         number_to_free - num_freed);
  50                 }
  51         }
  52 }