arch/mips/include/asm/octeon/cvmx-helper-util.h

   1 /***********************license start***************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2008 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  ***********************license end**************************************/
  27
  28 /*
  29  *
  30  * Small helper utilities.
  31  *
  32  */
  33
  34 #ifndef __CVMX_HELPER_UTIL_H__
  35 #define __CVMX_HELPER_UTIL_H__
  36
  37 /**
  38  * Convert a interface mode into a human readable string
  39  *
  40  * @mode:   Mode to convert
  41  *
  42  * Returns String
  43  */
  44 extern const char
  45     *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t mode);
  46
  47 /**
  48  * Setup Random Early Drop to automatically begin dropping packets.
  49  *
  50  * @pass_thresh:
  51  *               Packets will begin slowly dropping when there are less than
  52  *               this many packet buffers free in FPA 0.
  53  * @drop_thresh:
  54  *               All incoming packets will be dropped when there are less
  55  *               than this many free packet buffers in FPA 0.
  56  * Returns Zero on success. Negative on failure
  57  */
  58 extern int cvmx_helper_setup_red(int pass_thresh, int drop_thresh);
  59
  60 /**
  61  * Get the version of the CVMX libraries.
  62  *
  63  * Returns Version string. Note this buffer is allocated statically
  64  *         and will be shared by all callers.
  65  */
  66 extern const char *cvmx_helper_get_version(void);
  67
  68 /**
  69  * Setup the common GMX settings that determine the number of
  70  * ports. These setting apply to almost all configurations of all
  71  * chips.
  72  *
  73  * @interface: Interface to configure
  74  * @num_ports: Number of ports on the interface
  75  *
  76  * Returns Zero on success, negative on failure
  77  */
  78 extern int __cvmx_helper_setup_gmx(int interface, int num_ports);
  79
  80 /**
  81  * Returns the IPD/PKO port number for a port on the given
  82  * interface.
  83  *
  84  * @interface: Interface to use
  85  * @port:      Port on the interface
  86  *
  87  * Returns IPD/PKO port number
  88  */
  89 extern int cvmx_helper_get_ipd_port(int interface, int port);
  90
  91 /**
  92  * Returns the IPD/PKO port number for the first port on the given
  93  * interface.
  94  *
  95  * @interface: Interface to use
  96  *
  97  * Returns IPD/PKO port number
  98  */
  99 static inline int cvmx_helper_get_first_ipd_port(int interface)
 100 {
 101         return cvmx_helper_get_ipd_port(interface, 0);
 102 }
 103
 104 /**
 105  * Returns the IPD/PKO port number for the last port on the given
 106  * interface.
 107  *
 108  * @interface: Interface to use
 109  *
 110  * Returns IPD/PKO port number
 111  */
 112 static inline int cvmx_helper_get_last_ipd_port(int interface)
 113 {
 114         extern int cvmx_helper_ports_on_interface(int interface);
 115
 116         return cvmx_helper_get_first_ipd_port(interface) +
 117                cvmx_helper_ports_on_interface(interface) - 1;
 118 }
 119
 120 /**
 121  * Free the packet buffers contained in a work queue entry.
 122  * The work queue entry is not freed.
 123  *
 124  * @work:   Work queue entry with packet to free
 125  */
 126 static inline void cvmx_helper_free_packet_data(cvmx_wqe_t *work)
 127 {
 128         uint64_t number_buffers;
 129         union cvmx_buf_ptr buffer_ptr;
 130         union cvmx_buf_ptr next_buffer_ptr;
 131         uint64_t start_of_buffer;
 132
 133         number_buffers = work->word2.s.bufs;
 134         if (number_buffers == 0)
 135                 return;
 136         buffer_ptr = work->packet_ptr;
 137
 138         /*
 139          * Since the number of buffers is not zero, we know this is
 140          * not a dynamic short packet. We need to check if it is a
 141          * packet received with IPD_CTL_STATUS[NO_WPTR]. If this is
 142          * true, we need to free all buffers except for the first
 143          * one. The caller doesn't expect their WQE pointer to be
 144          * freed
 145          */
 146         start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
 147         if (cvmx_ptr_to_phys(work) == start_of_buffer) {
 148                 next_buffer_ptr =
 149                     *(union cvmx_buf_ptr *) cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
 150                 buffer_ptr = next_buffer_ptr;
 151                 number_buffers--;
 152         }
 153
 154         while (number_buffers--) {
 155                 /*
 156                  * Remember the back pointer is in cache lines, not
 157                  * 64bit words
 158                  */
 159                 start_of_buffer =
 160                     ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
 161                 /*
 162                  * Read pointer to next buffer before we free the
 163                  * current buffer.
 164                  */
 165                 next_buffer_ptr =
 166                     *(union cvmx_buf_ptr *) cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
 167                 cvmx_fpa_free(cvmx_phys_to_ptr(start_of_buffer),
 168                               buffer_ptr.s.pool, 0);
 169                 buffer_ptr = next_buffer_ptr;
 170         }
 171 }
 172
 173 /**
 174  * Returns the interface number for an IPD/PKO port number.
 175  *
 176  * @ipd_port: IPD/PKO port number
 177  *
 178  * Returns Interface number
 179  */
 180 extern int cvmx_helper_get_interface_num(int ipd_port);
 181
 182 /**
 183  * Returns the interface index number for an IPD/PKO port
 184  * number.
 185  *
 186  * @ipd_port: IPD/PKO port number
 187  *
 188  * Returns Interface index number
 189  */
 190 extern int cvmx_helper_get_interface_index_num(int ipd_port);
 191
 192 #endif /* __CVMX_HELPER_H__ */