ethernet-mem.c

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    1 /*************************************************************************
    2 Copyright (c) 2003-2007  Cavium Networks (support@cavium.com). All rights
    3 reserved.
    4 
    5 
    6 Redistribution and use in source and binary forms, with or without
    7 modification, are permitted provided that the following conditions are
    8 met:
    9 
   10     * Redistributions of source code must retain the above copyright
   11       notice, this list of conditions and the following disclaimer.
   12 
   13     * Redistributions in binary form must reproduce the above
   14       copyright notice, this list of conditions and the following
   15       disclaimer in the documentation and/or other materials provided
   16       with the distribution.
   17 
   18     * Neither the name of Cavium Networks nor the names of
   19       its contributors may be used to endorse or promote products
   20       derived from this software without specific prior written
   21       permission.
   22 
   23 This Software, including technical data, may be subject to U.S. export  control laws, including the U.S. Export Administration Act and its  associated regulations, and may be subject to export or import  regulations in other countries.
   24 
   25 TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
   26 AND WITH ALL FAULTS AND CAVIUM  NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
   27 
   28 *************************************************************************/
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/8.4/sys/mips/cavium/octe/ethernet-mem.c 210311 2010-07-20 19:25:11Z jmallett $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/endian.h>
   37 #include <sys/kernel.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/socket.h>
   40 
   41 #include <net/ethernet.h>
   42 #include <net/if.h>
   43 
   44 #include "wrapper-cvmx-includes.h"
   45 #include "ethernet-headers.h"
   46 
   47 /**
   48  * Fill the supplied hardware pool with mbufs
   49  *
   50  * @param pool     Pool to allocate an mbuf for
   51  * @param size     Size of the buffer needed for the pool
   52  * @param elements Number of buffers to allocate
   53  */
   54 static int cvm_oct_fill_hw_mbuf(int pool, int size, int elements)
   55 {
   56         int freed = elements;
   57         while (freed) {
   58                 KASSERT(size <= MCLBYTES - 128, ("mbuf clusters are too small"));
   59 
   60                 struct mbuf *m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
   61                 if (__predict_false(m == NULL)) {
   62                         printf("Failed to allocate mbuf for hardware pool %d\n", pool);
   63                         break;
   64                 }
   65 
   66                 m->m_data += 128 - (((uintptr_t)m->m_data) & 0x7f);
   67                 *(struct mbuf **)(m->m_data - sizeof(void *)) = m;
   68                 cvmx_fpa_free(m->m_data, pool, DONT_WRITEBACK(size/128));
   69                 freed--;
   70         }
   71         return (elements - freed);
   72 }
   73 
   74 
   75 /**
   76  * Free the supplied hardware pool of mbufs
   77  *
   78  * @param pool     Pool to allocate an mbuf for
   79  * @param size     Size of the buffer needed for the pool
   80  * @param elements Number of buffers to allocate
   81  */
   82 static void cvm_oct_free_hw_mbuf(int pool, int size, int elements)
   83 {
   84         char *memory;
   85 
   86         do {
   87                 memory = cvmx_fpa_alloc(pool);
   88                 if (memory) {
   89                         struct mbuf *m = *(struct mbuf **)(memory - sizeof(void *));
   90                         elements--;
   91                         m_freem(m);
   92                 }
   93         } while (memory);
   94 
   95         if (elements < 0)
   96                 printf("Warning: Freeing of pool %u had too many mbufs (%d)\n", pool, elements);
   97         else if (elements > 0)
   98                 printf("Warning: Freeing of pool %u is missing %d mbufs\n", pool, elements);
   99 }
  100 
  101 
  102 /**
  103  * This function fills a hardware pool with memory. Depending
  104  * on the config defines, this memory might come from the
  105  * kernel or global 32bit memory allocated with
  106  * cvmx_bootmem_alloc.
  107  *
  108  * @param pool     Pool to populate
  109  * @param size     Size of each buffer in the pool
  110  * @param elements Number of buffers to allocate
  111  */
  112 static int cvm_oct_fill_hw_memory(int pool, int size, int elements)
  113 {
  114         char *memory;
  115         int freed = elements;
  116 
  117         if (USE_32BIT_SHARED) {
  118 #if 0
  119                 extern uint64_t octeon_reserve32_memory;
  120 
  121                 memory = cvmx_bootmem_alloc_range(elements*size, 128, octeon_reserve32_memory,
  122                                                 octeon_reserve32_memory + (CONFIG_CAVIUM_RESERVE32<<20) - 1);
  123                 if (memory == NULL)
  124                         panic("Unable to allocate %u bytes for FPA pool %d\n", elements*size, pool);
  125 
  126                 printf("Memory range %p - %p reserved for hardware\n", memory, memory + elements*size - 1);
  127 
  128                 while (freed) {
  129                         cvmx_fpa_free(memory, pool, 0);
  130                         memory += size;
  131                         freed--;
  132                 }
  133 #else
  134                 panic("%s: may need to implement using shared memory.", __func__);
  135 #endif
  136         } else {
  137                 while (freed) {
  138                         /* We need to force alignment to 128 bytes here */
  139 #if 0
  140                         memory = kmalloc(size + 127, GFP_ATOMIC);
  141 #else
  142                         panic("%s: not yet implemented.", __func__);
  143 #endif
  144                         if (__predict_false(memory == NULL)) {
  145                                 printf("Unable to allocate %u bytes for FPA pool %d\n", elements*size, pool);
  146                                 break;
  147                         }
  148                         memory = (char *)(((unsigned long)memory+127) & -128);
  149                         cvmx_fpa_free(memory, pool, 0);
  150                         freed--;
  151                 }
  152         }
  153         return (elements - freed);
  154 }
  155 
  156 
  157 /**
  158  * Free memory previously allocated with cvm_oct_fill_hw_memory
  159  *
  160  * @param pool     FPA pool to free
  161  * @param size     Size of each buffer in the pool
  162  * @param elements Number of buffers that should be in the pool
  163  */
  164 static void cvm_oct_free_hw_memory(int pool, int size, int elements)
  165 {
  166         if (USE_32BIT_SHARED) {
  167                 printf("Warning: 32 shared memory is not freeable\n");
  168         } else {
  169                 char *memory;
  170                 do {
  171                         memory = cvmx_fpa_alloc(pool);
  172                         if (memory) {
  173                                 elements--;
  174 #if 0
  175                                 kfree(phys_to_virt(cvmx_ptr_to_phys(memory)));
  176 #else
  177                                 panic("%s: not yet implemented.", __func__);
  178 #endif
  179                         }
  180                 } while (memory);
  181 
  182                 if (elements < 0)
  183                         printf("Freeing of pool %u had too many buffers (%d)\n", pool, elements);
  184                 else if (elements > 0)
  185                         printf("Warning: Freeing of pool %u is missing %d buffers\n", pool, elements);
  186         }
  187 }
  188 
  189 
  190 int cvm_oct_mem_fill_fpa(int pool, int size, int elements)
  191 {
  192         int freed;
  193         if (USE_MBUFS_IN_HW)
  194                 freed = cvm_oct_fill_hw_mbuf(pool, size, elements);
  195         else
  196                 freed = cvm_oct_fill_hw_memory(pool, size, elements);
  197         return (freed);
  198 }
  199 
  200 void cvm_oct_mem_empty_fpa(int pool, int size, int elements)
  201 {
  202         if (USE_MBUFS_IN_HW)
  203                 cvm_oct_free_hw_mbuf(pool, size, elements);
  204         else
  205                 cvm_oct_free_hw_memory(pool, size, elements);
  206 }
  207

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FreeBSD/Linux Kernel Cross Reference sys/mips/cavium/octe/ethernet-mem.c

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sys/mips/cavium/octe/ethernet-mem.c