diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/CMakeLists.txt | 12 | ||||
| -rw-r--r-- | src/lib/shm_du_map.c | 366 | ||||
| -rw-r--r-- | src/lib/tests/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | src/lib/tests/shm_du_map_test.c | 184 |
4 files changed, 563 insertions, 0 deletions
diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt index e81f3475..7ce98bf2 100644 --- a/src/lib/CMakeLists.txt +++ b/src/lib/CMakeLists.txt @@ -4,6 +4,16 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR}) include_directories(${CMAKE_SOURCE_DIR}/include) include_directories(${CMAKE_BINARY_DIR}/include) +find_library(LIBRT_LIBRARIES rt) +if(NOT LIBRT_LIBRARIES) + message(FATAL_ERROR "librt not found") +endif() + +find_library(LIBPTHREAD_LIBRARIES pthread) +if(NOT LIBPTHREAD_LIBRARIES) + message(FATAL_ERROR "libpthread not found") +endif() + set(SOURCE_FILES # Add source files here bitmap.c @@ -15,11 +25,13 @@ set(SOURCE_FILES irm.c list.c rina_name.c + shm_du_map.c sockets.c utils.c ) add_library(ouroboros SHARED ${SOURCE_FILES}) +target_link_libraries(ouroboros rt pthread) include(MacroAddCompileFlags) if (CMAKE_BUILD_TYPE MATCHES Debug) diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c new file mode 100644 index 00000000..dc73077f --- /dev/null +++ b/src/lib/shm_du_map.c @@ -0,0 +1,366 @@ +/* + * Ouroboros - Copyright (C) 2016 + * + * Shared memory map for data units + * + * Dimitri Staessens <dimitri.staessens@intec.ugent.be> + * Sander Vrijders <sander.vrijders@intec.ugent.be> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <ouroboros/shm_du_map.h> +#include <pthread.h> +#include <sys/mman.h> +#include <fcntl.h> +#include <malloc.h> +#include <string.h> + +#define SHM_BLOCKS_SIZE (SHM_BLOCKS_IN_MAP * SHM_DU_BUFF_BLOCK_SIZE) +#define SHM_FILE_SIZE (SHM_BLOCKS_SIZE + 2 * sizeof (size_t) \ + + sizeof(pthread_mutex_t)) + +#define get_head_ptr(dum) \ +((struct shm_du_buff *)(dum->shm_base + (*dum->ptr_head * \ + SHM_DU_BUFF_BLOCK_SIZE))) + +#define get_tail_ptr(dum) \ +((struct shm_du_buff *)(dum->shm_base + (*dum->ptr_tail * \ + SHM_DU_BUFF_BLOCK_SIZE))) + +#define block_ptr_to_idx(dum, sdb) \ + (((uint8_t *)sdb - dum->shm_base) / SHM_DU_BUFF_BLOCK_SIZE) + +#define shm_map_used(dum)((*dum->ptr_head + SHM_BLOCKS_IN_MAP - *dum->ptr_tail)\ + & (SHM_BLOCKS_IN_MAP - 1)) +#define shm_map_free(dum, i)(shm_map_used(dum) + i < SHM_BLOCKS_IN_MAP) + +#define MIN(a,b)(a < b ? a : b) + +struct shm_du_buff { + size_t size; + size_t du_head; + size_t du_tail; +}; + +struct shm_du_map { + uint8_t * shm_base; /* start of blocks */ + size_t * ptr_head; /* start of ringbuffer head */ + size_t * ptr_tail; /* start of ringbuffer tail */ + pthread_mutex_t * shm_mutex; /* lock all free space in shm */ + int fd; +}; + +struct shm_du_map * shm_du_map_create() +{ + struct shm_du_map * dum; + int shm_fd; + uint8_t * shm_base; + pthread_mutexattr_t attr; + + dum = malloc(sizeof *dum); + if (dum == NULL) { + LOG_DBGF("Could not allocate struct."); + return NULL; + } + + shm_fd = shm_open(SHM_DU_MAP_FILENAME, O_CREAT | O_EXCL | O_RDWR, 0666); + if (shm_fd == -1) { + LOG_DBGF("Failed creating shared memory map."); + free(dum); + return NULL; + } + + if (lseek(shm_fd, SHM_FILE_SIZE - 1, SEEK_SET) < 0) { + LOG_DBGF("Failed to extend shared memory map."); + free(dum); + return NULL; + } + + if (write(shm_fd, "", 1) != 1) { + LOG_DBGF("Failed to finalise extension of shared memory map."); + free(dum); + return NULL; + } + + shm_base = mmap(NULL, + SHM_FILE_SIZE, + PROT_READ | PROT_WRITE, + MAP_SHARED, + shm_fd, + 0); + + if (shm_base == MAP_FAILED) { + LOG_DBGF("Failed to map shared memory."); + + if (shm_unlink(SHM_DU_MAP_FILENAME) == -1) + LOG_DBGF("Failed to remove invalid shm."); + + free(dum); + return NULL; + } + + dum->shm_base = shm_base; + dum->ptr_head = (size_t *) + ((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE); + dum->ptr_tail = (size_t *) + ((uint8_t *) dum->ptr_head + sizeof(size_t)); + dum->shm_mutex = (pthread_mutex_t *) + ((uint8_t *) dum->ptr_tail + sizeof(size_t)); + + pthread_mutexattr_init(&attr); + pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); + pthread_mutex_init(dum->shm_mutex, &attr); + + *dum->ptr_head = 0; + *dum->ptr_tail = 0; + + dum->fd = shm_fd; + + return dum; +} + +struct shm_du_map * shm_du_map_open() +{ + struct shm_du_map * dum; + int shm_fd; + uint8_t * shm_base; + + shm_fd = shm_open(SHM_DU_MAP_FILENAME, O_RDWR, 0666); + if (shm_fd == -1) { + LOG_DBGF("Failed opening shared memory."); + return NULL; + } + + shm_base = mmap(NULL, + SHM_FILE_SIZE, + PROT_READ | PROT_WRITE, + MAP_SHARED, + shm_fd, + 0); + if (shm_base == MAP_FAILED) { + LOG_DBGF("Failed to map shared memory."); + if (close(shm_fd) == -1) + LOG_DBGF("Failed to close invalid shm."); + + if (shm_unlink(SHM_DU_MAP_FILENAME) == -1) + LOG_DBGF("Failed to unlink invalid shm."); + + return NULL; + } + + dum = malloc(sizeof *dum); + if (dum == NULL) { + LOG_DBGF("Could not allocate struct."); + return NULL; + } + + dum->shm_base = shm_base; + dum->ptr_head = (size_t *) + ((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE); + dum->ptr_tail = (size_t *) + ((uint8_t *) dum->ptr_head + sizeof(size_t)); + dum->shm_mutex = (pthread_mutex_t *) + ((uint8_t *) dum->ptr_tail + sizeof(size_t)); + + dum->fd = shm_fd; + + return dum; +} + +void shm_du_map_close(struct shm_du_map * dum) +{ + if (dum == NULL) { + LOG_DBGF("Bogus input. Bugging out."); + return; + } + + if (munmap(dum->shm_base, SHM_FILE_SIZE) == -1) + LOG_DBGF("Couldn't unmap shared memory."); + + if (shm_unlink(SHM_DU_MAP_FILENAME) == -1) + LOG_DBGF("Failed to unlink shm."); + + free(dum); +} + +struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum, + size_t size, + size_t headspace, + uint8_t * data, + size_t len) +{ + struct shm_du_buff * sdb; + long blocks = 0; + int sz = size + sizeof *sdb; + int sz2 = headspace + len + sizeof *sdb; + uint8_t * write_pos; + size_t copy_len; + + if (dum == NULL || data == NULL) { + LOG_DBGF("Bogus input, bugging out."); + return NULL; + } + + if (headspace >= size) { + LOG_DBGF("Index out of bounds."); + return NULL; + } + + if (headspace + len > size) { + LOG_DBGF("Buffer too small for data."); + return NULL; + } + + pthread_mutex_lock(dum->shm_mutex); + + while (sz > 0) { + sz -= SHM_DU_BUFF_BLOCK_SIZE; + sz2 -= SHM_DU_BUFF_BLOCK_SIZE; + if (sz2 < 0 && sz > 0) { + pthread_mutex_unlock(dum->shm_mutex); + LOG_DBG("Can't handle this packet now"); + return NULL; + } + ++blocks; + } + + if (!shm_map_free(dum, blocks)) { + pthread_mutex_unlock(dum->shm_mutex); + LOG_DBGF("Allocation failed, Out of Memory."); + return NULL; + } + + sdb = get_head_ptr(dum); + + sdb->size = size; + sdb->du_head = headspace; + sdb->du_tail = sdb->du_head + len; + + copy_len = MIN(len, SHM_DU_BUFF_BLOCK_SIZE - headspace - sizeof *sdb); + write_pos = ((uint8_t *) sdb) + sizeof *sdb + headspace; + + while (blocks > 0) { + memcpy(write_pos, data, copy_len); + *(dum->ptr_head) = (*dum->ptr_head + 1) + & (SHM_BLOCKS_IN_MAP - 1); + len -= copy_len; + copy_len = MIN(len, SHM_DU_BUFF_BLOCK_SIZE); + write_pos = (uint8_t *) get_head_ptr(dum); + --blocks; + } + + pthread_mutex_unlock(dum->shm_mutex); + + return sdb; +} + +int shm_release_du_buff(struct shm_du_map * dum) +{ + long sz; + long blocks = 0; + + pthread_mutex_lock(dum->shm_mutex); + + if (*dum->ptr_head == *dum->ptr_tail) { + LOG_DBGF("Attempt to free empty ringbuffer. Nothing to do."); + pthread_mutex_unlock(dum->shm_mutex); + return -1; + } + + sz = get_tail_ptr(dum)->size; + + while (sz + (long) sizeof (struct shm_du_buff) > 0) { + sz -= SHM_DU_BUFF_BLOCK_SIZE; + ++blocks; + } + + *(dum->ptr_tail) = (*dum->ptr_tail + blocks) & (SHM_BLOCKS_IN_MAP - 1); + pthread_mutex_unlock(dum->shm_mutex); + + return 0; +} + +uint8_t * shm_du_buff_head_alloc(struct shm_du_buff * sdb, + size_t size) +{ + if (sdb == NULL) { + LOG_DBGF("Bogus input, bugging out."); + return NULL; + } + + if ((long) (sdb->du_head - size) < 0) { + LOG_DBGF("Failed to allocate PCI headspace."); + return NULL; + } + + sdb->du_head -= size; + + return (uint8_t *) sdb + sizeof *sdb + sdb->du_head; +} + +uint8_t * shm_du_buff_tail_alloc(struct shm_du_buff * sdb, + size_t size) +{ + if (sdb == NULL) { + LOG_DBGF("Bogus input, bugging out."); + return NULL; + } + + if (sdb->du_tail + size >= sdb->size) { + LOG_DBGF("Failed to allocate PCI tailspace."); + return NULL; + } + + sdb->du_tail += size; + + return (uint8_t *) sdb + sizeof *sdb + sdb->du_tail; +} + +int shm_du_buff_head_release(struct shm_du_buff * sdb, + size_t size) +{ + if (sdb == NULL) { + LOG_DBGF("Bogus input, bugging out."); + return -EINVAL; + } + + if (size > sdb->du_tail - sdb->du_head) { + LOG_DBGF("Tried to release beyond sdu boundary."); + return -EOVERFLOW; + } + + sdb->du_head += size; + + return sdb->du_head; +} + +int shm_du_buff_tail_release(struct shm_du_buff * sdb, + size_t size) +{ + if (sdb == NULL) { + LOG_DBGF("Bogus input, bugging out."); + return -EINVAL; + } + + if (size > sdb->du_tail - sdb->du_head) { + LOG_DBGF("Tried to release beyond sdu boundary."); + return -EOVERFLOW; + } + + sdb->du_tail -= size; + + return sdb->du_tail; +} diff --git a/src/lib/tests/CMakeLists.txt b/src/lib/tests/CMakeLists.txt index 99df7232..80834df8 100644 --- a/src/lib/tests/CMakeLists.txt +++ b/src/lib/tests/CMakeLists.txt @@ -5,6 +5,7 @@ create_test_sourcelist(${src_folder}_tests test_suite.c # Add new tests here bitmap_test.c du_buff_test.c + shm_du_map_test.c ) add_executable(${src_folder}_test EXCLUDE_FROM_ALL ${${src_folder}_tests}) diff --git a/src/lib/tests/shm_du_map_test.c b/src/lib/tests/shm_du_map_test.c new file mode 100644 index 00000000..d9b44732 --- /dev/null +++ b/src/lib/tests/shm_du_map_test.c @@ -0,0 +1,184 @@ +/* + * Ouroboros - Copyright (C) 2016 + * + * Test of the Shared Memory Map + * + * Dimitri Staessens <dimitri.staessens@intec.ugent.be> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <ouroboros/shm_du_map.h> +#include <sys/types.h> +#include <stdlib.h> +#include <time.h> +#include <sys/mman.h> +#include <pthread.h> + +#define SIZE_OF_DU_BUFF 24 +#define TEST_BUFF_SIZE (SHM_DU_BUFF_BLOCK_SIZE - SIZE_OF_DU_BUFF) + +#define MAX(a,b) (a > b ? a : b) +#define MIN(a,b) (a < b ? a : b) + +int sync; + +void * produce() +{ + struct shm_du_map * dum; + long test_buf_size = 0; + uint8_t * test_values; + int headspace; + int tailspace; + long i; + long bytes_written = 0; + struct timespec starttime; + struct timespec stoptime; + double elapsed; + + dum = shm_du_map_open(); + if (dum == NULL) { + LOG_ERR("Could not open shm."); + return (void *)-1; + } + + srand(time(NULL)); + + test_values = malloc (sizeof *test_values * TEST_BUFF_SIZE); + for (i = 0; i < TEST_BUFF_SIZE; i++) + test_values[i] = 170; + + clock_gettime(CLOCK_MONOTONIC, &starttime); + for (i = 1; i < SHM_BLOCKS_IN_MAP; i++) { + struct shm_du_buff * sdb; + size_t len; + + test_buf_size = TEST_BUFF_SIZE; + + headspace = 32; + tailspace = 8; + + len = test_buf_size - (headspace + tailspace); + + sdb = shm_create_du_buff(dum, + test_buf_size, + headspace, + test_values, + len); + + if (sdb != NULL) { + bytes_written += len; + } + else { + sync = -2; + break; + } + } + + clock_gettime(CLOCK_MONOTONIC, &stoptime); + elapsed =(stoptime.tv_sec + stoptime.tv_nsec / 1000000000.0) - + (starttime.tv_sec + starttime.tv_nsec / 1000000000.0); + LOG_INFO("%ld bytes written in %.1lf ms = %lf Gb/s", + bytes_written, + elapsed * 1000.0, + bytes_written * 8 / (elapsed * 1000000000)); + + free(test_values); + + sync = -1; + + return 0; +} + +void * consume() +{ + struct shm_du_map * dum; + + struct timespec ts; + + ts.tv_sec = 0; + ts.tv_nsec = 1000000; + + dum = shm_du_map_open(); + + if (dum == NULL) { + LOG_ERR("Could not open shm."); + return (void *)-1; + } + + while (!sync) { + while (!shm_release_du_buff(dum)); + nanosleep(&ts, NULL); + } + + return 0; +} + +int shm_du_map_test(int argc, char ** argv) +{ + struct shm_du_map * dum; + int res1; + pthread_t producer; + pthread_t consumer; + + /* test 1 */ + + LOG_INFO("starting create/close test."); + + dum = shm_du_map_create(); + + if (dum == NULL) { + LOG_ERR("Could not open shm (dum)."); + return -1; + } + + shm_du_map_close(dum); + + LOG_INFO("done."); + + /* test 2 */ + + LOG_INFO("starting sequential test."); + + dum = shm_du_map_create(); + + res1 = (int) pthread_create(&producer, NULL, produce, NULL); + pthread_join(producer, NULL); + + pthread_create(&consumer, NULL, consume, NULL); + pthread_join(consumer, NULL); + + shm_du_map_close(dum); + + LOG_INFO("done."); + + /* test 3 */ + + LOG_INFO("starting concurrency test."); + + dum = shm_du_map_create(); + + res1 = (int) pthread_create(&producer, NULL, produce, NULL); + pthread_create(&consumer, NULL, consume, NULL); + + pthread_join(producer, NULL); + pthread_join(consumer, NULL); + + shm_du_map_close(dum); + + LOG_INFO("done."); + + return res1; +} |