/* *------------------------------------------------------------------ * memory_client.c - API message handling, client code. * * Copyright (c) 2010 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 <setjmp.h> #include <svm/svm.h> #include <svm/ssvm.h> #include <vppinfra/serialize.h> #include <vppinfra/hash.h> #include <vlibmemory/memory_client.h> /* A hack. vl_client_get_first_plugin_msg_id depends on it */ #include <vlibmemory/socket_client.h> #include <vlibmemory/vl_memory_msg_enum.h> #define vl_typedefs /* define message structures */ #include <vlibmemory/vl_memory_api_h.h> #undef vl_typedefs #define vl_endianfun /* define message structures */ #include <vlibmemory/vl_memory_api_h.h> #undef vl_endianfun /* instantiate all the print functions we know about */ #define vl_print(handle, ...) clib_warning (__VA_ARGS__) #define vl_printfun #include <vlibmemory/vl_memory_api_h.h> #undef vl_printfun typedef struct { u8 rx_thread_jmpbuf_valid; u8 connected_to_vlib; jmp_buf rx_thread_jmpbuf; pthread_t rx_thread_handle; /* Plugin message base lookup scheme */ volatile u8 first_msg_id_reply_ready; u16 first_msg_id_reply; } memory_client_main_t; memory_client_main_t memory_client_main; static void * rx_thread_fn (void *arg) { svm_queue_t *q; memory_client_main_t *mm = &memory_client_main; api_main_t *am = &api_main; int i; q = am->vl_input_queue; /* So we can make the rx thread terminate cleanly */ if (setjmp (mm->rx_thread_jmpbuf) == 0) { mm->rx_thread_jmpbuf_valid = 1; /* * Find an unused slot in the per-cpu-mheaps array, * and grab it for this thread. We need to be able to * push/pop the thread heap without affecting other thread(s). */ if (__os_thread_index == 0) { for (i = 0; i < ARRAY_LEN (clib_per_cpu_mheaps); i++) { if (clib_per_cpu_mheaps[i] == 0) { /* Copy the main thread mheap pointer */ clib_per_cpu_mheaps[i] = clib_per_cpu_mheaps[0]; __os_thread_index = i; break; } } ASSERT (__os_thread_index > 0); } while (1) vl_msg_api_queue_handler (q); } pthread_exit (0); } static void vl_api_rx_thread_exit_t_handler (vl_api_rx_thread_exit_t * mp) { memory_client_main_t *mm = &memory_client_main; vl_msg_api_free (mp); longjmp (mm->rx_thread_jmpbuf, 1); } 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 = uword_to_pointer (mp->message_table, u8 *); unserialize_open_data (sm, tblv, vec_len (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); } } static void noop_handler (void *notused) { } int vl_client_connect (const 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; svm_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 = svm_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 = svm_queue_sub (vl_input_queue, (u8 *) & rp, SVM_Q_NOWAIT, 0); 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); svm_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; } int vl_client_disconnect (void) { vl_api_memclnt_delete_t *mp; vl_api_memclnt_delete_reply_t *rp; svm_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; return -1; } if (svm_queue_sub (vl_input_queue, (u8 *) & rp, SVM_Q_NOWAIT, 0) < 0) continue; /* drain the queue */ if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY) { clib_warning ("queue drain: %d", ntohs (rp->_vl_msg_id)); vl_msg_api_handler ((void *) rp); continue; } vl_msg_api_handler ((void *) rp); break; } return 0; } /** * Stave off the binary API dead client reaper * Only sent to inactive clients */ static void vl_api_memclnt_keepalive_t_handler (vl_api_memclnt_keepalive_t * mp) { vl_api_memclnt_keepalive_reply_t *rmp; api_main_t *am; vl_shmem_hdr_t *shmem_hdr; am = &api_main; shmem_hdr = am->shmem_hdr; rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp)); memset (rmp, 0, sizeof (*rmp)); rmp->_vl_msg_id = ntohs (VL_API_MEMCLNT_KEEPALIVE_REPLY); rmp->context = mp->context; vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & rmp); } #define foreach_api_msg \ _(RX_THREAD_EXIT, rx_thread_exit) \ _(MEMCLNT_CREATE_REPLY, memclnt_create_reply) \ _(MEMCLNT_DELETE_REPLY, memclnt_delete_reply) \ _(MEMCLNT_KEEPALIVE, memclnt_keepalive) void vl_client_install_client_message_handlers (void) { #define _(N,n) \ vl_msg_api_set_handlers(VL_API_##N, #n, \ vl_api_##n##_t_handler, \ noop_handler, \ vl_api_##n##_t_endian, \ vl_api_##n##_t_print, \ sizeof(vl_api_##n##_t), 1); foreach_api_msg; #undef _ } int vl_client_api_map (const char *region_name) { int rv; if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0) return rv; vl_client_install_client_message_handlers (); return 0; } void vl_client_api_unmap (void) { vl_unmap_shmem_client (); } u8 vl_mem_client_is_connected (void) { return (memory_client_main.connected_to_vlib != 0); } static int connect_to_vlib_internal (const char *svm_name, const char *client_name, int rx_queue_size, int want_pthread, int do_map) { int rv = 0; memory_client_main_t *mm = &memory_client_main; if (do_map && (rv = vl_client_api_map (svm_name))) { clib_warning ("vl_client_api map rv %d", rv); return rv; } if (vl_client_connect (client_name, 0 /* punt quota */ , rx_queue_size /* input queue */ ) < 0) { vl_client_api_unmap (); return -1; } /* Start the rx queue thread */ if (want_pthread) { rv = pthread_create (&mm->rx_thread_handle, NULL /*attr */ , rx_thread_fn, 0); if (rv) clib_warning ("pthread_create returned %d", rv); } mm->connected_to_vlib = 1; return 0; } int vl_client_connect_to_vlib (const char *svm_name, const char *client_name, int rx_queue_size) { return connect_to_vlib_internal (svm_name, client_name, rx_queue_size, 1 /* want pthread */ , 1 /* do map */ ); } int vl_client_connect_to_vlib_no_rx_pthread (const char *svm_name, const char *client_name, int rx_queue_size) { return connect_to_vlib_internal (svm_name, client_name, rx_queue_size, 0 /* want pthread */ , 1 /* do map */ ); } int vl_client_connect_to_vlib_no_map (const char *svm_name, const char *client_name, int rx_queue_size) { return connect_to_vlib_internal (svm_name, client_name, rx_queue_size, 1 /* want pthread */ , 0 /* dont map */ ); } static void disconnect_from_vlib_internal (u8 do_unmap) { memory_client_main_t *mm = &memory_client_main; api_main_t *am = &api_main; uword junk; if (mm->rx_thread_jmpbuf_valid) { vl_api_rx_thread_exit_t *ep; ep = vl_msg_api_alloc (sizeof (*ep)); ep->_vl_msg_id = ntohs (VL_API_RX_THREAD_EXIT); vl_msg_api_send_shmem (am->vl_input_queue, (u8 *) & ep); pthread_join (mm->rx_thread_handle, (void **) &junk); } if (mm->connected_to_vlib) { vl_client_disconnect (); if (do_unmap) vl_client_api_unmap (); } memset (mm, 0, sizeof (*mm)); } void vl_client_disconnect_from_vlib (void) { disconnect_from_vlib_internal (1); } void vl_client_disconnect_from_vlib_no_unmap (void) { disconnect_from_vlib_internal (0); } static void vl_api_get_first_msg_id_reply_t_handler (vl_api_get_first_msg_id_reply_t * mp) { memory_client_main_t *mm = &memory_client_main; i32 retval = ntohl (mp->retval); mm->first_msg_id_reply = (retval >= 0) ? ntohs (mp->first_msg_id) : ~0; mm->first_msg_id_reply_ready = 1; } u16 vl_client_get_first_plugin_msg_id (const char *plugin_name) { vl_api_get_first_msg_id_t *mp; api_main_t *am = &api_main; memory_client_main_t *mm = &memory_client_main; f64 timeout; void *old_handler; clib_time_t clib_time; u16 rv = ~0; if (strlen (plugin_name) + 1 > sizeof (mp->name)) return (rv); memset (&clib_time, 0, sizeof (clib_time)); clib_time_init (&clib_time); /* Push this plugin's first_msg_id_reply handler */ old_handler = am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY]; am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = (void *) vl_api_get_first_msg_id_reply_t_handler; /* Ask the data-plane for the message-ID base of the indicated plugin */ mm->first_msg_id_reply_ready = 0; /* Not using shm client */ if (!am->my_registration) { mp = vl_socket_client_msg_alloc (sizeof (*mp)); memset (mp, 0, sizeof (*mp)); mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID); mp->client_index = am->my_client_index; strncpy ((char *) mp->name, plugin_name, sizeof (mp->name) - 1); if (vl_socket_client_write () <= 0) goto sock_err; if (vl_socket_client_read (1)) goto sock_err; if (mm->first_msg_id_reply_ready == 1) { rv = mm->first_msg_id_reply; goto result; } sock_err: /* Restore old handler */ am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler; return -1; } else { mp = vl_msg_api_alloc (sizeof (*mp)); memset (mp, 0, sizeof (*mp)); mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID); mp->client_index = am->my_client_index; strncpy ((char *) mp->name, plugin_name, sizeof (mp->name) - 1); vl_msg_api_send_shmem (am->shmem_hdr->vl_input_queue, (u8 *) & mp); /* Synchronously wait for the answer */ timeout = clib_time_now (&clib_time) + 1.0; while (clib_time_now (&clib_time) < timeout) { if (mm->first_msg_id_reply_ready == 1) { rv = mm->first_msg_id_reply; goto result; } } /* Restore old handler */ am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler; return rv; } result: /* Restore the old handler */ am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler; if (rv == (u16) ~ 0) clib_warning ("plugin '%s' not registered", plugin_name); return rv; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */