diff options
Diffstat (limited to 'vpp/vlib-api/vlibmemory/memory_shared.c')
| -rw-r--r-- | vpp/vlib-api/vlibmemory/memory_shared.c | 847 |
1 files changed, 847 insertions, 0 deletions
diff --git a/vpp/vlib-api/vlibmemory/memory_shared.c b/vpp/vlib-api/vlibmemory/memory_shared.c new file mode 100644 index 00000000..6adc69fc --- /dev/null +++ b/vpp/vlib-api/vlibmemory/memory_shared.c @@ -0,0 +1,847 @@ +/* + *------------------------------------------------------------------ + * 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 <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vlibmemory/api.h> +#include <vlibmemory/unix_shared_memory_queue.h> + +#include <vlibmemory/vl_memory_msg_enum.h> + +#define vl_typedefs +#include <vlibmemory/vl_memory_api_h.h> +#undef vl_typedefs + +static inline void * +vl_msg_api_alloc_internal (int nbytes, int pool, int may_return_null) +{ + int i; + msgbuf_t *rv; + ring_alloc_t *ap; + unix_shared_memory_queue_t *q; + void *oldheap; + vl_shmem_hdr_t *shmem_hdr; + api_main_t *am = &api_main; + + shmem_hdr = am->shmem_hdr; + + 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) + { + /* yes, loser; try next larger pool */ + ap[i].misses++; + if (pool == 0) + pthread_mutex_unlock (&q->mutex); + continue; + } + /* 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; + 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++; + + pthread_mutex_lock (&am->vlib_rp->mutex); + oldheap = svm_push_data_heap (am->vlib_rp); + if (may_return_null) + { + rv = clib_mem_alloc_or_null (nbytes); + if (PREDICT_FALSE (rv == 0)) + { + svm_pop_heap (oldheap); + pthread_mutex_unlock (&am->vlib_rp->mutex); + return 0; + } + } + else + rv = clib_mem_alloc (nbytes); + + rv->q = 0; + svm_pop_heap (oldheap); + pthread_mutex_unlock (&am->vlib_rp->mutex); + +out: + rv->data_len = htonl (nbytes - sizeof (msgbuf_t)); + return (rv->data); +} + +void * +vl_msg_api_alloc (int nbytes) +{ + int pool; + api_main_t *am = &api_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 (nbytes, pool, 0 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_or_null (int nbytes) +{ + int pool; + api_main_t *am = &api_main; + vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr; + + pool = (am->our_pid == shmem_hdr->vl_pid); + return vl_msg_api_alloc_internal (nbytes, pool, 1 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_as_if_client (int nbytes) +{ + return vl_msg_api_alloc_internal (nbytes, 0, 0 /* may_return_null */ ); +} + +void * +vl_msg_api_alloc_as_if_client_or_null (int nbytes) +{ + return vl_msg_api_alloc_internal (nbytes, 0, 1 /* may_return_null */ ); +} + +void +vl_msg_api_free (void *a) +{ + msgbuf_t *rv; + void *oldheap; + api_main_t *am = &api_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; + return; + } + + pthread_mutex_lock (&am->vlib_rp->mutex); + oldheap = svm_push_data_heap (am->vlib_rp); + clib_mem_free (rv); + svm_pop_heap (oldheap); + pthread_mutex_unlock (&am->vlib_rp->mutex); +} + +static void +vl_msg_api_free_nolock (void *a) +{ + msgbuf_t *rv; + void *oldheap; + api_main_t *am = &api_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; + return; + } + + oldheap = svm_push_data_heap (am->vlib_rp); + clib_mem_free (rv); + svm_pop_heap (oldheap); +} + +void +vl_set_memory_root_path (char *name) +{ + api_main_t *am = &api_main; + + am->root_path = name; +} + +void +vl_set_memory_uid (int uid) +{ + api_main_t *am = &api_main; + + am->api_uid = uid; +} + +void +vl_set_memory_gid (int gid) +{ + api_main_t *am = &api_main; + + am->api_gid = gid; +} + +void +vl_set_global_memory_baseva (u64 baseva) +{ + api_main_t *am = &api_main; + + am->global_baseva = baseva; +} + +void +vl_set_global_memory_size (u64 size) +{ + api_main_t *am = &api_main; + + am->global_size = size; +} + +void +vl_set_api_memory_size (u64 size) +{ + api_main_t *am = &api_main; + + am->api_size = size; +} + +void +vl_set_global_pvt_heap_size (u64 size) +{ + api_main_t *am = &api_main; + + am->global_pvt_heap_size = size; +} + +void +vl_set_api_pvt_heap_size (u64 size) +{ + api_main_t *am = &api_main; + + am->api_pvt_heap_size = size; +} + +int +vl_map_shmem (char *region_name, int is_vlib) +{ + svm_map_region_args_t _a, *a = &_a; + svm_region_t *vlib_rp, *root_rp; + void *oldheap; + vl_shmem_hdr_t *shmem_hdr = 0; + api_main_t *am = &api_main; + int i; + struct timespec ts, tsrem; + + if (is_vlib == 0) + svm_region_init_chroot (am->root_path); + + memset (a, 0, sizeof (*a)); + + 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) + { + unix_shared_memory_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 */ + memset (&q->mutex, 0, sizeof (q->mutex)); + clib_warning ("forcibly release main input queue mutex"); + + mutex_ok: + am->vlib_rp = vlib_rp; + while (unix_shared_memory_queue_sub (q, + (u8 *) & old_msg, + 1 /* nowait */ ) + != -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... */ + + oldheap = svm_push_data_heap (vlib_rp); + + vec_validate (shmem_hdr, 0); + shmem_hdr->version = VL_SHM_VERSION; + + /* vlib main input queue */ + shmem_hdr->vl_input_queue = + unix_shared_memory_queue_init (1024, sizeof (uword), getpid (), + am->vlib_signal); + + /* Set up the msg ring allocator */ +#define _(sz,n) \ + do { \ + ring_alloc_t _rp; \ + _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 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 = unix_shared_memory_queue_init ((n), (sz), 0, 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 _ + + 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; + + 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); + vec_add1 (am->mapped_shmem_regions, vlib_rp); + return 0; +} + +void +vl_register_mapped_shmem_region (svm_region_t * rp) +{ + api_main_t *am = &api_main; + + vec_add1 (am->mapped_shmem_regions, rp); +} + +void +vl_unmap_shmem (void) +{ + svm_region_t *rp; + int i; + api_main_t *am = &api_main; + + if (!svm_get_root_rp ()) + return; + + for (i = 0; i < vec_len (am->mapped_shmem_regions); i++) + { + rp = am->mapped_shmem_regions[i]; + svm_region_unmap (rp); + } + + vec_free (am->mapped_shmem_regions); + am->shmem_hdr = 0; + + svm_region_exit (); + /* $$$ more careful cleanup, valgrind run... */ + vec_free (am->msg_handlers); + vec_free (am->msg_endian_handlers); + vec_free (am->msg_print_handlers); +} + +void +vl_msg_api_send_shmem (unix_shared_memory_queue_t * q, u8 * elem) +{ + api_main_t *am = &api_main; + uword *trace = (uword *) elem; + + if (am->tx_trace && am->tx_trace->enabled) + vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]); + + (void) unix_shared_memory_queue_add (q, elem, 0 /* nowait */ ); +} + +void +vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t * q, u8 * elem) +{ + api_main_t *am = &api_main; + uword *trace = (uword *) elem; + + if (am->tx_trace && am->tx_trace->enabled) + vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]); + + (void) unix_shared_memory_queue_add_nolock (q, elem); +} + +static void +vl_api_memclnt_create_reply_t_handler (vl_api_memclnt_create_reply_t * mp) +{ + serialize_main_t _sm, *sm = &_sm; + api_main_t *am = &api_main; + u8 *tblv; + u32 nmsgs; + int i; + u8 *name_and_crc; + u32 msg_index; + + am->my_client_index = mp->index; + am->my_registration = (vl_api_registration_t *) (uword) mp->handle; + + /* Clean out any previous hash table (unlikely) */ + if (am->msg_index_by_name_and_crc) + { + int i; + u8 **keys = 0; + hash_pair_t *hp; + /* *INDENT-OFF* */ + hash_foreach_pair (hp, am->msg_index_by_name_and_crc, + ({ + vec_add1 (keys, (u8 *) hp->key); + })); + /* *INDENT-ON* */ + for (i = 0; i < vec_len (keys); i++) + vec_free (keys[i]); + vec_free (keys); + } + + am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword)); + + /* Recreate the vnet-side API message handler table */ + tblv = (u8 *) mp->message_table; + serialize_open_vector (sm, tblv); + unserialize_integer (sm, &nmsgs, sizeof (u32)); + + for (i = 0; i < nmsgs; i++) + { + msg_index = unserialize_likely_small_unsigned_integer (sm); + unserialize_cstring (sm, (char **) &name_and_crc); + hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index); + } +} + +u32 +vl_api_get_msg_index (u8 * name_and_crc) +{ + api_main_t *am = &api_main; + uword *p; + + if (am->msg_index_by_name_and_crc) + { + p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc); + if (p) + return p[0]; + } + return ~0; +} + +int +vl_client_connect (char *name, int ctx_quota, int input_queue_size) +{ + svm_region_t *svm; + vl_api_memclnt_create_t *mp; + vl_api_memclnt_create_reply_t *rp; + unix_shared_memory_queue_t *vl_input_queue; + vl_shmem_hdr_t *shmem_hdr; + int rv = 0; + void *oldheap; + api_main_t *am = &api_main; + + if (am->my_registration) + { + clib_warning ("client %s already connected...", name); + return -1; + } + + if (am->vlib_rp == 0) + { + clib_warning ("am->vlib_rp NULL"); + return -1; + } + + svm = am->vlib_rp; + shmem_hdr = am->shmem_hdr; + + if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0) + { + clib_warning ("shmem_hdr / input queue NULL"); + return -1; + } + + pthread_mutex_lock (&svm->mutex); + oldheap = svm_push_data_heap (svm); + vl_input_queue = + unix_shared_memory_queue_init (input_queue_size, sizeof (uword), + getpid (), 0); + pthread_mutex_unlock (&svm->mutex); + svm_pop_heap (oldheap); + + am->my_client_index = ~0; + am->my_registration = 0; + am->vl_input_queue = vl_input_queue; + + mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_create_t)); + memset (mp, 0, sizeof (*mp)); + mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_CREATE); + mp->ctx_quota = ctx_quota; + mp->input_queue = (uword) vl_input_queue; + strncpy ((char *) mp->name, name, sizeof (mp->name) - 1); + + vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp); + + while (1) + { + int qstatus; + struct timespec ts, tsrem; + int i; + + /* Wait up to 10 seconds */ + for (i = 0; i < 1000; i++) + { + qstatus = unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp, + 1 /* nowait */ ); + if (qstatus == 0) + goto read_one_msg; + ts.tv_sec = 0; + ts.tv_nsec = 10000 * 1000; /* 10 ms */ + while (nanosleep (&ts, &tsrem) < 0) + ts = tsrem; + } + /* Timeout... */ + clib_warning ("memclnt_create_reply timeout"); + return -1; + + read_one_msg: + if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_CREATE_REPLY) + { + clib_warning ("unexpected reply: id %d", ntohs (rp->_vl_msg_id)); + continue; + } + rv = clib_net_to_host_u32 (rp->response); + + vl_msg_api_handler ((void *) rp); + break; + } + return (rv); +} + +static void +vl_api_memclnt_delete_reply_t_handler (vl_api_memclnt_delete_reply_t * mp) +{ + void *oldheap; + api_main_t *am = &api_main; + + pthread_mutex_lock (&am->vlib_rp->mutex); + oldheap = svm_push_data_heap (am->vlib_rp); + unix_shared_memory_queue_free (am->vl_input_queue); + pthread_mutex_unlock (&am->vlib_rp->mutex); + svm_pop_heap (oldheap); + + am->my_client_index = ~0; + am->my_registration = 0; + am->vl_input_queue = 0; +} + +void +vl_client_disconnect (void) +{ + vl_api_memclnt_delete_t *mp; + vl_api_memclnt_delete_reply_t *rp; + unix_shared_memory_queue_t *vl_input_queue; + vl_shmem_hdr_t *shmem_hdr; + time_t begin; + api_main_t *am = &api_main; + + ASSERT (am->vlib_rp); + shmem_hdr = am->shmem_hdr; + ASSERT (shmem_hdr && shmem_hdr->vl_input_queue); + + vl_input_queue = am->vl_input_queue; + + mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_delete_t)); + memset (mp, 0, sizeof (*mp)); + mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_DELETE); + mp->index = am->my_client_index; + mp->handle = (uword) am->my_registration; + + vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp); + + /* + * Have to be careful here, in case the client is disconnecting + * because e.g. the vlib process died, or is unresponsive. + */ + + begin = time (0); + while (1) + { + time_t now; + + now = time (0); + + if (now >= (begin + 2)) + { + clib_warning ("peer unresponsive, give up"); + am->my_client_index = ~0; + am->my_registration = 0; + am->shmem_hdr = 0; + break; + } + if (unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp, 1) < 0) + continue; + + /* drain the queue */ + if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY) + { + vl_msg_api_handler ((void *) rp); + continue; + } + vl_msg_api_handler ((void *) rp); + break; + } +} + +static inline vl_api_registration_t * +vl_api_client_index_to_registration_internal (u32 handle) +{ + vl_api_registration_t **regpp; + vl_api_registration_t *regp; + api_main_t *am = &api_main; + u32 index; + + index = vl_msg_api_handle_get_index (handle); + if ((am->shmem_hdr->application_restarts & VL_API_EPOCH_MASK) + != vl_msg_api_handle_get_epoch (handle)) + { + vl_msg_api_increment_missing_client_counter (); + return 0; + } + + regpp = am->vl_clients + index; + + if (pool_is_free (am->vl_clients, regpp)) + { + vl_msg_api_increment_missing_client_counter (); + return 0; + } + regp = *regpp; + return (regp); +} + +vl_api_registration_t * +vl_api_client_index_to_registration (u32 index) +{ + return (vl_api_client_index_to_registration_internal (index)); +} + +unix_shared_memory_queue_t * +vl_api_client_index_to_input_queue (u32 index) +{ + vl_api_registration_t *regp; + + regp = vl_api_client_index_to_registration_internal (index); + if (!regp) + return 0; + return (regp->vl_input_queue); +} + +#define foreach_api_client_msg \ +_(MEMCLNT_CREATE_REPLY, memclnt_create_reply) \ +_(MEMCLNT_DELETE_REPLY, memclnt_delete_reply) + +int +vl_client_api_map (char *region_name) +{ + int rv; + + if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0) + { + return rv; + } + +#define _(N,n) \ + vl_msg_api_set_handlers(VL_API_##N, 0 /* name */, \ + vl_api_##n##_t_handler, \ + 0/* cleanup */, 0/* endian */, 0/* print */, \ + sizeof(vl_api_##n##_t), 1); + foreach_api_client_msg; +#undef _ + return 0; +} + +void +vl_client_api_unmap (void) +{ + vl_unmap_shmem (); +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |