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Diffstat (limited to 'app/test-pmd/mempool_anon.c')
| -rw-r--r-- | app/test-pmd/mempool_anon.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/app/test-pmd/mempool_anon.c b/app/test-pmd/mempool_anon.c new file mode 100644 index 00000000..47304329 --- /dev/null +++ b/app/test-pmd/mempool_anon.c @@ -0,0 +1,201 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include "mempool_osdep.h" +#include <rte_errno.h> + +#ifdef RTE_EXEC_ENV_LINUXAPP + +#include <fcntl.h> +#include <unistd.h> +#include <sys/mman.h> + + +#define PAGEMAP_FNAME "/proc/self/pagemap" + +/* + * the pfn (page frame number) are bits 0-54 (see pagemap.txt in linux + * Documentation). + */ +#define PAGEMAP_PFN_BITS 54 +#define PAGEMAP_PFN_MASK RTE_LEN2MASK(PAGEMAP_PFN_BITS, phys_addr_t) + + +static int +get_phys_map(void *va, phys_addr_t pa[], uint32_t pg_num, uint32_t pg_sz) +{ + int32_t fd, rc; + uint32_t i, nb; + off_t ofs; + + ofs = (uintptr_t)va / pg_sz * sizeof(*pa); + nb = pg_num * sizeof(*pa); + + if ((fd = open(PAGEMAP_FNAME, O_RDONLY)) < 0) + return ENOENT; + + if ((rc = pread(fd, pa, nb, ofs)) < 0 || (rc -= nb) != 0) { + + RTE_LOG(ERR, USER1, "failed read of %u bytes from \'%s\' " + "at offset %zu, error code: %d\n", + nb, PAGEMAP_FNAME, (size_t)ofs, errno); + rc = ENOENT; + } + + close(fd); + + for (i = 0; i != pg_num; i++) + pa[i] = (pa[i] & PAGEMAP_PFN_MASK) * pg_sz; + + return rc; +} + +struct rte_mempool * +mempool_anon_create(const char *name, unsigned elt_num, unsigned elt_size, + unsigned cache_size, unsigned private_data_size, + rte_mempool_ctor_t *mp_init, void *mp_init_arg, + rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg, + int socket_id, unsigned flags) +{ + struct rte_mempool *mp; + phys_addr_t *pa; + char *va, *uv; + uint32_t n, pg_num, pg_shift, pg_sz, total_size; + size_t sz; + ssize_t usz; + int32_t rc; + + rc = ENOMEM; + mp = NULL; + + pg_sz = getpagesize(); + if (rte_is_power_of_2(pg_sz) == 0) { + rte_errno = EINVAL; + return mp; + } + + pg_shift = rte_bsf32(pg_sz); + + total_size = rte_mempool_calc_obj_size(elt_size, flags, NULL); + + /* calc max memory size and max number of pages needed. */ + sz = rte_mempool_xmem_size(elt_num, total_size, pg_shift); + pg_num = sz >> pg_shift; + + /* get chunk of virtually continuos memory.*/ + if ((va = mmap(NULL, sz, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_ANONYMOUS | MAP_LOCKED, + -1, 0)) == MAP_FAILED) { + RTE_LOG(ERR, USER1, "%s(%s) failed mmap of %zu bytes, " + "error code: %d\n", + __func__, name, sz, errno); + rte_errno = rc; + return mp; + } + + /* extract physical mappings of the allocated memory. */ + if ((pa = calloc(pg_num, sizeof (*pa))) != NULL && + (rc = get_phys_map(va, pa, pg_num, pg_sz)) == 0) { + + /* + * Check that allocated size is big enough to hold elt_num + * objects and a calcualte how many bytes are actually required. + */ + + if ((usz = rte_mempool_xmem_usage(va, elt_num, total_size, pa, + pg_num, pg_shift)) < 0) { + + n = -usz; + rc = ENOENT; + RTE_LOG(ERR, USER1, "%s(%s) only %u objects from %u " + "requested can be created over " + "mmaped region %p of %zu bytes\n", + __func__, name, n, elt_num, va, sz); + } else { + + /* unmap unused pages if any */ + if ((size_t)usz < sz) { + + uv = va + usz; + usz = sz - usz; + + RTE_LOG(INFO, USER1, + "%s(%s): unmap unused %zu of %zu " + "mmaped bytes @%p\n", + __func__, name, (size_t)usz, sz, uv); + munmap(uv, usz); + sz -= usz; + pg_num = sz >> pg_shift; + } + + if ((mp = rte_mempool_xmem_create(name, elt_num, + elt_size, cache_size, private_data_size, + mp_init, mp_init_arg, + obj_init, obj_init_arg, + socket_id, flags, va, pa, pg_num, + pg_shift)) != NULL) + + RTE_VERIFY(elt_num == mp->size); + } + } + + if (mp == NULL) { + munmap(va, sz); + rte_errno = rc; + } + + free(pa); + return mp; +} + +#else /* RTE_EXEC_ENV_LINUXAPP */ + + +struct rte_mempool * +mempool_anon_create(__rte_unused const char *name, + __rte_unused unsigned elt_num, __rte_unused unsigned elt_size, + __rte_unused unsigned cache_size, + __rte_unused unsigned private_data_size, + __rte_unused rte_mempool_ctor_t *mp_init, + __rte_unused void *mp_init_arg, + __rte_unused rte_mempool_obj_ctor_t *obj_init, + __rte_unused void *obj_init_arg, + __rte_unused int socket_id, __rte_unused unsigned flags) +{ + rte_errno = ENOTSUP; + return NULL; +} + +#endif /* RTE_EXEC_ENV_LINUXAPP */ |