--- /dev/null
+/*-
+ * 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 */
Code Review / deb_dpdk.git / blobdiff