diff options
Diffstat (limited to 'src/vlibapi')
| -rw-r--r-- | src/vlibapi/CMakeLists.txt | 20 | ||||
| -rw-r--r-- | src/vlibapi/memory_shared.c | 817 | ||||
| -rw-r--r-- | src/vlibapi/memory_shared.h | 147 |
3 files changed, 975 insertions, 9 deletions
diff --git a/src/vlibapi/CMakeLists.txt b/src/vlibapi/CMakeLists.txt index e6937a6db01..95bb4cf7469 100644 --- a/src/vlibapi/CMakeLists.txt +++ b/src/vlibapi/CMakeLists.txt @@ -11,16 +11,18 @@ # See the License for the specific language governing permissions and # limitations under the License. -install( - FILES - api_helper_macros.h +add_vpp_library (vlibapi + SOURCES + api_shared.c + node_serialize.c + memory_shared.c + + INSTALL_HEADERS api.h - vat_helper_macros.h api_common.h + api_helper_macros.h api_types.h - - DESTINATION - ${CMAKE_INSTALL_INCLUDEDIR}/vlibapi - - COMPONENT vpp-dev + vat_helper_macros.h + memory_shared.h ) + diff --git a/src/vlibapi/memory_shared.c b/src/vlibapi/memory_shared.c new file mode 100644 index 00000000000..77a610b9434 --- /dev/null +++ b/src/vlibapi/memory_shared.c @@ -0,0 +1,817 @@ +/* + *------------------------------------------------------------------ + * memclnt_shared.c - API message handling, common code for both clients + * and the vlib process itself. + * + * + * Copyright (c) 2009 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <string.h> +#include <unistd.h> +#include <signal.h> + +#include <vppinfra/format.h> +#include <vppinfra/byte_order.h> +#include <vppinfra/error.h> +#include <vppinfra/elog.h> +#include <svm/queue.h> +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vlibmemory/memory_api.h> +#include <vlibmemory/vl_memory_msg_enum.h> +#include <vlibapi/api_common.h> + +#define vl_typedefs +#include <vlibmemory/vl_memory_api_h.h> +#undef vl_typedefs + +#define DEBUG_MESSAGE_BUFFER_OVERRUN 0 + +__clib_nosanitize_addr static inline void * +vl_msg_api_alloc_internal (svm_region_t *vlib_rp, int nbytes, int pool, + int may_return_null) +{ + int i; + msgbuf_t *rv; + ring_alloc_t *ap; + svm_queue_t *q; + void *oldheap; + vl_shmem_hdr_t *shmem_hdr; + api_main_t *am = vlibapi_get_main (); + + shmem_hdr = (void *) vlib_rp->user_ctx; + +#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0 + nbytes += 4; +#endif + + ASSERT (pool == 0 || vlib_get_thread_index () == 0); + + if (shmem_hdr == 0) + { + clib_warning ("shared memory header NULL"); + return 0; + } + + /* account for the msgbuf_t header */ + nbytes += sizeof (msgbuf_t); + + if (shmem_hdr->vl_rings == 0) + { + clib_warning ("vl_rings NULL"); + ASSERT (0); + abort (); + } + + if (shmem_hdr->client_rings == 0) + { + clib_warning ("client_rings NULL"); + ASSERT (0); + abort (); + } + + ap = pool ? shmem_hdr->vl_rings : shmem_hdr->client_rings; + for (i = 0; i < vec_len (ap); i++) + { + /* Too big? */ + if (nbytes > ap[i].size) + { + continue; + } + + q = ap[i].rp; + if (pool == 0) + { + pthread_mutex_lock (&q->mutex); + } + rv = (msgbuf_t *) (&q->data[0] + q->head * q->elsize); + /* + * Is this item still in use? + */ + if (rv->q) + { + u32 now = (u32) time (0); + + if (PREDICT_TRUE (rv->gc_mark_timestamp == 0)) + rv->gc_mark_timestamp = now; + else + { + if (now - rv->gc_mark_timestamp > 10) + { + if (CLIB_DEBUG > 0) + { + u16 *msg_idp, msg_id; + vl_api_msg_data_t *m; + clib_warning + ("garbage collect pool %d ring %d index %d", pool, i, + q->head); + msg_idp = (u16 *) (rv->data); + msg_id = clib_net_to_host_u16 (*msg_idp); + m = vl_api_get_msg_data (am, msg_id); + if (m) + clib_warning ("msg id %d name %s", (u32) msg_id, + m->name); + } + shmem_hdr->garbage_collects++; + goto collected; + } + } + + + /* yes, loser; try next larger pool */ + ap[i].misses++; + if (pool == 0) + pthread_mutex_unlock (&q->mutex); + continue; + } + collected: + + /* OK, we have a winner */ + ap[i].hits++; + /* + * Remember the source queue, although we + * don't need to know the queue to free the item. + */ + rv->q = q; + rv->gc_mark_timestamp = 0; + q->head++; + if (q->head == q->maxsize) + q->head = 0; + + if (pool == 0) + pthread_mutex_unlock (&q->mutex); + goto out; + } + + /* + * Request too big, or head element of all size-compatible rings + * still in use. Fall back to shared-memory malloc. + */ + am->ring_misses++; + + oldheap = vl_msg_push_heap_w_region (vlib_rp); + if (may_return_null) + { + rv = clib_mem_alloc_or_null (nbytes); + if (PREDICT_FALSE (rv == 0)) + { + vl_msg_pop_heap_w_region (vlib_rp, oldheap); + return 0; + } + } + else + rv = clib_mem_alloc (nbytes); + + rv->q = 0; + rv->gc_mark_timestamp = 0; + vl_msg_pop_heap_w_region (vlib_rp, oldheap); + +out: +#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0 + { + nbytes -= 4; + u32 *overrun; + overrun = (u32 *) (rv->data + nbytes - sizeof (msgbuf_t)); + *overrun = 0x1badbabe; + } +#endif + rv->data_len = htonl (nbytes - sizeof (msgbuf_t)); + + VL_MSG_API_UNPOISON (rv->data); + return (rv->data); +} + +void * +vl_msg_api_alloc (int nbytes) +{ + int pool; + api_main_t *am = vlibapi_get_main (); + vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr; + + /* + * Clients use pool-0, vlib proc uses pool 1 + */ + pool = (am->our_pid == shmem_hdr->vl_pid); + return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, pool, + 0 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_zero (int nbytes) +{ + void *ret; + + ret = vl_msg_api_alloc (nbytes); + clib_memset (ret, 0, nbytes); + return ret; +} + +void * +vl_msg_api_alloc_or_null (int nbytes) +{ + int pool; + api_main_t *am = vlibapi_get_main (); + vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr; + + pool = (am->our_pid == shmem_hdr->vl_pid); + return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, pool, + 1 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_as_if_client (int nbytes) +{ + api_main_t *am = vlibapi_get_main (); + return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, 0, + 0 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_zero_as_if_client (int nbytes) +{ + void *ret; + + ret = vl_msg_api_alloc_as_if_client (nbytes); + clib_memset (ret, 0, nbytes); + return ret; +} + +void * +vl_msg_api_alloc_as_if_client_or_null (int nbytes) +{ + api_main_t *am = vlibapi_get_main (); + return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, 0, + 1 /* may_return_null */ ); +} + +void * +vl_mem_api_alloc_as_if_client_w_reg (vl_api_registration_t * reg, int nbytes) +{ + return vl_msg_api_alloc_internal (reg->vlib_rp, nbytes, 0, + 0 /* may_return_null */ ); +} + +void +vl_msg_api_free_w_region (svm_region_t * vlib_rp, void *a) +{ + msgbuf_t *rv; + void *oldheap; + + rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data)); + + /* + * Here's the beauty of the scheme. Only one proc/thread has + * control of a given message buffer. To free a buffer, we just clear the + * queue field, and leave. No locks, no hits, no errors... + */ + if (rv->q) + { + rv->q = 0; + rv->gc_mark_timestamp = 0; +#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0 + { + u32 *overrun; + overrun = (u32 *) (rv->data + ntohl (rv->data_len)); + ASSERT (*overrun == 0x1badbabe); + } +#endif + VL_MSG_API_POISON (rv->data); + return; + } + + oldheap = vl_msg_push_heap_w_region (vlib_rp); + +#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0 + { + u32 *overrun; + overrun = (u32 *) (rv->data + ntohl (rv->data_len)); + ASSERT (*overrun == 0x1badbabe); + } +#endif + + clib_mem_free (rv); + vl_msg_pop_heap_w_region (vlib_rp, oldheap); +} + +void +vl_msg_api_free (void *a) +{ + api_main_t *am = vlibapi_get_main (); + vl_msg_api_free_w_region (am->vlib_rp, a); +} + +static void +vl_msg_api_free_nolock (void *a) +{ + msgbuf_t *rv; + void *oldheap; + api_main_t *am = vlibapi_get_main (); + + rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data)); + /* + * Here's the beauty of the scheme. Only one proc/thread has + * control of a given message buffer. To free a buffer, we just clear the + * queue field, and leave. No locks, no hits, no errors... + */ + if (rv->q) + { + rv->q = 0; + VL_MSG_API_POISON (rv->data); + return; + } + + oldheap = svm_push_data_heap (am->vlib_rp); + clib_mem_free (rv); + svm_pop_heap (oldheap); +} + +void +vl_set_memory_root_path (const char *name) +{ + api_main_t *am = vlibapi_get_main (); + + am->root_path = name; +} + +void +vl_set_memory_uid (int uid) +{ + api_main_t *am = vlibapi_get_main (); + + am->api_uid = uid; +} + +void +vl_set_memory_gid (int gid) +{ + api_main_t *am = vlibapi_get_main (); + + am->api_gid = gid; +} + +void +vl_set_global_memory_baseva (u64 baseva) +{ + api_main_t *am = vlibapi_get_main (); + + am->global_baseva = baseva; +} + +void +vl_set_global_memory_size (u64 size) +{ + api_main_t *am = vlibapi_get_main (); + + am->global_size = size; +} + +void +vl_set_api_memory_size (u64 size) +{ + api_main_t *am = vlibapi_get_main (); + + am->api_size = size; +} + +void +vl_set_global_pvt_heap_size (u64 size) +{ + api_main_t *am = vlibapi_get_main (); + + am->global_pvt_heap_size = size; +} + +void +vl_set_api_pvt_heap_size (u64 size) +{ + api_main_t *am = vlibapi_get_main (); + + am->api_pvt_heap_size = size; +} + +static void +vl_api_default_mem_config (vl_shmem_hdr_t * shmem_hdr) +{ + api_main_t *am = vlibapi_get_main (); + u32 vlib_input_queue_length; + + /* vlib main input queue */ + vlib_input_queue_length = 1024; + if (am->vlib_input_queue_length) + vlib_input_queue_length = am->vlib_input_queue_length; + + shmem_hdr->vl_input_queue = + svm_queue_alloc_and_init (vlib_input_queue_length, sizeof (uword), + getpid ()); + +#define _(sz,n) \ + do { \ + ring_alloc_t _rp; \ + _rp.rp = svm_queue_alloc_and_init ((n), (sz), 0); \ + _rp.size = (sz); \ + _rp.nitems = n; \ + _rp.hits = 0; \ + _rp.misses = 0; \ + vec_add1(shmem_hdr->vl_rings, _rp); \ + } while (0); + + foreach_vl_aring_size; +#undef _ + +#define _(sz,n) \ + do { \ + ring_alloc_t _rp; \ + _rp.rp = svm_queue_alloc_and_init ((n), (sz), 0); \ + _rp.size = (sz); \ + _rp.nitems = n; \ + _rp.hits = 0; \ + _rp.misses = 0; \ + vec_add1(shmem_hdr->client_rings, _rp); \ + } while (0); + + foreach_clnt_aring_size; +#undef _ +} + +void +vl_api_mem_config (vl_shmem_hdr_t * hdr, vl_api_shm_elem_config_t * config) +{ + vl_api_shm_elem_config_t *c; + ring_alloc_t *rp; + u32 size; + + if (!config) + { + vl_api_default_mem_config (hdr); + return; + } + + vec_foreach (c, config) + { + switch (c->type) + { + case VL_API_QUEUE: + hdr->vl_input_queue = svm_queue_alloc_and_init (c->count, c->size, + getpid ()); + continue; + case VL_API_VLIB_RING: + vec_add2 (hdr->vl_rings, rp, 1); + break; + case VL_API_CLIENT_RING: + vec_add2 (hdr->client_rings, rp, 1); + break; + default: + clib_warning ("unknown config type: %d", c->type); + continue; + } + + size = sizeof (ring_alloc_t) + c->size; + rp->rp = svm_queue_alloc_and_init (c->count, size, 0); + rp->size = size; + rp->nitems = c->count; + rp->hits = 0; + rp->misses = 0; + } +} + +void +vl_init_shmem (svm_region_t * vlib_rp, vl_api_shm_elem_config_t * config, + int is_vlib, int is_private_region) +{ + api_main_t *am = vlibapi_get_main (); + vl_shmem_hdr_t *shmem_hdr = 0; + void *oldheap; + ASSERT (vlib_rp); + + /* $$$$ need private region config parameters */ + + oldheap = svm_push_data_heap (vlib_rp); + + vec_validate (shmem_hdr, 0); + shmem_hdr->version = VL_SHM_VERSION; + shmem_hdr->clib_file_index = VL_API_INVALID_FI; + + /* Set up the queue and msg ring allocator */ + vl_api_mem_config (shmem_hdr, config); + + if (is_private_region == 0) + { + am->shmem_hdr = shmem_hdr; + am->vlib_rp = vlib_rp; + am->our_pid = getpid (); + if (is_vlib) + am->shmem_hdr->vl_pid = am->our_pid; + } + else + shmem_hdr->vl_pid = am->our_pid; + + svm_pop_heap (oldheap); + + /* + * After absolutely everything that a client might see is set up, + * declare the shmem region valid + */ + vlib_rp->user_ctx = shmem_hdr; + + pthread_mutex_unlock (&vlib_rp->mutex); +} + +int +vl_map_shmem (const char *region_name, int is_vlib) +{ + svm_map_region_args_t _a, *a = &_a; + svm_region_t *vlib_rp, *root_rp; + api_main_t *am = vlibapi_get_main (); + int i; + struct timespec ts, tsrem; + char *vpe_api_region_suffix = "-vpe-api"; + + clib_memset (a, 0, sizeof (*a)); + + if (strstr (region_name, vpe_api_region_suffix)) + { + u8 *root_path = format (0, "%s", region_name); + vec_set_len (root_path, + vec_len (root_path) - strlen (vpe_api_region_suffix)); + vec_terminate_c_string (root_path); + a->root_path = (const char *) root_path; + am->root_path = (const char *) root_path; + } + + if (is_vlib == 0) + { + int tfd; + u8 *api_name; + /* + * Clients wait for vpp to set up the root / API regioins + */ + if (am->root_path) + api_name = format (0, "/dev/shm/%s-%s%c", am->root_path, + region_name + 1, 0); + else + api_name = format (0, "/dev/shm%s%c", region_name, 0); + + /* Wait up to 100 seconds... */ + for (i = 0; i < 10000; i++) + { + ts.tv_sec = 0; + ts.tv_nsec = 10000 * 1000; /* 10 ms */ + while (nanosleep (&ts, &tsrem) < 0) + ts = tsrem; + tfd = open ((char *) api_name, O_RDWR); + if (tfd >= 0) + break; + } + vec_free (api_name); + if (tfd < 0) + { + clib_warning ("region init fail"); + return -2; + } + close (tfd); + svm_region_init_chroot_uid_gid (am->root_path, getuid (), getgid ()); + } + + if (a->root_path != NULL) + { + a->name = "/vpe-api"; + } + else + a->name = region_name; + a->size = am->api_size ? am->api_size : (16 << 20); + a->flags = SVM_FLAGS_MHEAP; + a->uid = am->api_uid; + a->gid = am->api_gid; + a->pvt_heap_size = am->api_pvt_heap_size; + + vlib_rp = svm_region_find_or_create (a); + + if (vlib_rp == 0) + return (-2); + + pthread_mutex_lock (&vlib_rp->mutex); + /* Has someone else set up the shared-memory variable table? */ + if (vlib_rp->user_ctx) + { + am->shmem_hdr = (void *) vlib_rp->user_ctx; + am->our_pid = getpid (); + if (is_vlib) + { + svm_queue_t *q; + uword old_msg; + /* + * application restart. Reset cached pids, API message + * rings, list of clients; otherwise, various things + * fail. (e.g. queue non-empty notification) + */ + + /* ghosts keep the region from disappearing properly */ + svm_client_scan_this_region_nolock (vlib_rp); + am->shmem_hdr->application_restarts++; + q = am->shmem_hdr->vl_input_queue; + am->shmem_hdr->vl_pid = getpid (); + q->consumer_pid = am->shmem_hdr->vl_pid; + /* Drain the input queue, freeing msgs */ + for (i = 0; i < 10; i++) + { + if (pthread_mutex_trylock (&q->mutex) == 0) + { + pthread_mutex_unlock (&q->mutex); + goto mutex_ok; + } + ts.tv_sec = 0; + ts.tv_nsec = 10000 * 1000; /* 10 ms */ + while (nanosleep (&ts, &tsrem) < 0) + ts = tsrem; + } + /* Mutex buggered, "fix" it */ + clib_memset (&q->mutex, 0, sizeof (q->mutex)); + clib_warning ("forcibly release main input queue mutex"); + + mutex_ok: + am->vlib_rp = vlib_rp; + while (svm_queue_sub (q, (u8 *) & old_msg, SVM_Q_NOWAIT, 0) + != -2 /* queue underflow */ ) + { + vl_msg_api_free_nolock ((void *) old_msg); + am->shmem_hdr->restart_reclaims++; + } + pthread_mutex_unlock (&vlib_rp->mutex); + root_rp = svm_get_root_rp (); + ASSERT (root_rp); + /* Clean up the root region client list */ + pthread_mutex_lock (&root_rp->mutex); + svm_client_scan_this_region_nolock (root_rp); + pthread_mutex_unlock (&root_rp->mutex); + } + else + { + pthread_mutex_unlock (&vlib_rp->mutex); + } + am->vlib_rp = vlib_rp; + vec_add1 (am->mapped_shmem_regions, vlib_rp); + return 0; + } + /* Clients simply have to wait... */ + if (!is_vlib) + { + pthread_mutex_unlock (&vlib_rp->mutex); + + /* Wait up to 100 seconds... */ + for (i = 0; i < 10000; i++) + { + ts.tv_sec = 0; + ts.tv_nsec = 10000 * 1000; /* 10 ms */ + while (nanosleep (&ts, &tsrem) < 0) + ts = tsrem; + if (vlib_rp->user_ctx) + goto ready; + } + /* Clean up and leave... */ + svm_region_unmap (vlib_rp); + clib_warning ("region init fail"); + return (-2); + + ready: + am->shmem_hdr = (void *) vlib_rp->user_ctx; + am->our_pid = getpid (); + am->vlib_rp = vlib_rp; + vec_add1 (am->mapped_shmem_regions, vlib_rp); + return 0; + } + + /* Nope, it's our problem... */ + vl_init_shmem (vlib_rp, 0 /* default config */ , 1 /* is vlib */ , + 0 /* is_private_region */ ); + + vec_add1 (am->mapped_shmem_regions, vlib_rp); + return 0; +} + +void +vl_register_mapped_shmem_region (svm_region_t * rp) +{ + api_main_t *am = vlibapi_get_main (); + + vec_add1 (am->mapped_shmem_regions, rp); +} + +static void +vl_unmap_shmem_internal (u8 is_client) +{ + svm_region_t *rp; + int i; + api_main_t *am = vlibapi_get_main (); + + if (!svm_get_root_rp ()) + return; + + for (i = 0; i < vec_len (am->mapped_shmem_regions); i++) + { + rp = am->mapped_shmem_regions[i]; + is_client ? svm_region_unmap_client (rp) : svm_region_unmap (rp); + } + + vec_free (am->mapped_shmem_regions); + am->shmem_hdr = 0; + + is_client ? svm_region_exit_client () : svm_region_exit (); + + vec_free (am->msg_data); +} + +void +vl_unmap_shmem (void) +{ + vl_unmap_shmem_internal (0); +} + +void +vl_unmap_shmem_client (void) +{ + vl_unmap_shmem_internal (1); +} + +void +vl_msg_api_send_shmem (svm_queue_t * q, u8 * elem) +{ + api_main_t *am = vlibapi_get_main (); + void *msg = (void *) *(uword *) elem; + + if (am->tx_trace && am->tx_trace->enabled) + vl_msg_api_trace (am, am->tx_trace, msg); + + /* + * Announce a probable binary API client bug: + * some client's input queue is stuffed. + * The situation may be recoverable, or not. + */ + if (PREDICT_FALSE + (am->vl_clients /* vpp side */ && (q->cursize == q->maxsize))) + { + if (PREDICT_FALSE (am->elog_trace_api_messages)) + { + /* *INDENT-OFF* */ + ELOG_TYPE_DECLARE (e) = + { + .format = "api-client-queue-stuffed: %x%x", + .format_args = "i4i4", + }; + /* *INDENT-ON* */ + struct + { + u32 hi, low; + } *ed; + ed = ELOG_DATA (am->elog_main, e); + ed->hi = (uword) q >> 32; + ed->low = (uword) q & 0xFFFFFFFF; + clib_warning ("WARNING: client input queue at %llx is stuffed...", + q); + } + } + VL_MSG_API_POISON (msg); + (void) svm_queue_add (q, elem, 0 /* nowait */ ); +} + +int +vl_mem_api_can_send (svm_queue_t * q) +{ + return (q->cursize < q->maxsize); +} + +void +vl_msg_api_send_shmem_nolock (svm_queue_t * q, u8 * elem) +{ + api_main_t *am = vlibapi_get_main (); + void *msg = (void *) *(uword *) elem; + + if (am->tx_trace && am->tx_trace->enabled) + vl_msg_api_trace (am, am->tx_trace, msg); + + (void) svm_queue_add_nolock (q, elem); + VL_MSG_API_POISON (msg); +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vlibapi/memory_shared.h b/src/vlibapi/memory_shared.h new file mode 100644 index 00000000000..4c4773d060b --- /dev/null +++ b/src/vlibapi/memory_shared.h @@ -0,0 +1,147 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2018 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#ifndef SRC_VLIBMEMORY_MEMORY_SHARED_H_ +#define SRC_VLIBMEMORY_MEMORY_SHARED_H_ + +#include <vlibapi/api_common.h> +#include <vppinfra/error.h> + +/* Allocated in shared memory */ + +/* + * Ring-allocation scheme for client API messages + * + * Only one proc/thread has control of a given message buffer. + * To free a buffer allocated from one of these rings, we clear + * a field in the buffer (header), and leave. + * + * No locks, no hits, no errors... + */ +typedef struct ring_alloc_ +{ + svm_queue_t *rp; + u16 size; + u16 nitems; + u32 hits; + u32 misses; +} ring_alloc_t; + +typedef enum +{ + VL_API_VLIB_RING, + VL_API_CLIENT_RING, + VL_API_QUEUE +} vl_api_shm_config_type_t; + +typedef struct vl_api_shm_elem_config_ +{ + u8 type; + u8 _pad; + u16 count; + u32 size; +} vl_api_shm_elem_config_t; + +STATIC_ASSERT (sizeof (vl_api_shm_elem_config_t) == 8, + "Size must be exactly 8 bytes"); + +/* + * Initializers for the (shared-memory) rings + * _(size, n). Note: each msg has space for a header. + */ +#define foreach_vl_aring_size \ +_(64+sizeof(ring_alloc_t), 1024) \ +_(256+sizeof(ring_alloc_t), 128) \ +_(1024+sizeof(ring_alloc_t), 64) + +#define foreach_clnt_aring_size \ + _(1024+sizeof(ring_alloc_t), 1024) \ + _(2048+sizeof(ring_alloc_t), 128) \ + _(4096+sizeof(ring_alloc_t), 8) + +typedef struct vl_shmem_hdr_ +{ + int version; + + /* getpid () for the VLIB client process */ + volatile int vl_pid; + + /* Client sends VLIB msgs here. */ + svm_queue_t *vl_input_queue; + + /* Vector of rings; one for each size. */ + + /* VLIB allocates buffers to send msgs to clients here. */ + ring_alloc_t *vl_rings; + + /* Clients allocate buffer to send msgs to VLIB here. */ + ring_alloc_t *client_rings; + + /* Number of detected application restarts */ + u32 application_restarts; + + /* Number of messages reclaimed during application restart */ + u32 restart_reclaims; + + /* Number of garbage-collected messages */ + u32 garbage_collects; + + /* Socket file index used to bootstrap shmem region */ + u32 clib_file_index; +} vl_shmem_hdr_t; + +#define VL_SHM_VERSION 2 +#define VL_API_EPOCH_MASK 0xFF +#define VL_API_EPOCH_SHIFT 8 + +void *vl_msg_api_alloc (int nbytes); +void *vl_msg_api_alloc_zero (int nbytes); +void *vl_msg_api_alloc_or_null (int nbytes); +void *vl_msg_api_alloc_as_if_client (int nbytes); +void *vl_msg_api_alloc_zero_as_if_client (int nbytes); +void *vl_msg_api_alloc_as_if_client_or_null (int nbytes); +void *vl_mem_api_alloc_as_if_client_w_reg (vl_api_registration_t * reg, + int nbytes); +void vl_msg_api_free (void *a); +void vl_msg_api_free_w_region (svm_region_t * vlib_rp, void *a); +int vl_map_shmem (const char *region_name, int is_vlib); +void vl_unmap_shmem (void); +void vl_unmap_shmem_client (void); +void vl_register_mapped_shmem_region (svm_region_t * rp); +void vl_msg_api_send_shmem (svm_queue_t * q, u8 * elem); +int vl_mem_api_can_send (svm_queue_t * q); +void vl_set_memory_region_name (const char *name); +void vl_set_memory_root_path (const char *root_path); +void vl_set_memory_uid (int uid); +void vl_set_memory_gid (int gid); +void vl_set_global_memory_baseva (u64 baseva); +void vl_set_global_memory_size (u64 size); +void vl_set_api_memory_size (u64 size); +void vl_set_global_pvt_heap_size (u64 size); +void vl_set_api_pvt_heap_size (u64 size); +void vl_init_shmem (svm_region_t * vlib_rp, vl_api_shm_elem_config_t * config, + int is_vlib, int is_private_region); + +#endif /* SRC_VLIBMEMORY_MEMORY_SHARED_H_ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |