diff options
Diffstat (limited to 'svm/ssvm.h')
| -rw-r--r-- | svm/ssvm.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/svm/ssvm.h b/svm/ssvm.h new file mode 100644 index 00000000000..51164931962 --- /dev/null +++ b/svm/ssvm.h @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2015 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 __included_ssvm_h__ +#define __included_ssvm_h__ + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <netinet/in.h> +#include <signal.h> +#include <pthread.h> +#include <unistd.h> +#include <time.h> +#include <fcntl.h> +#include <string.h> +#include <vppinfra/clib.h> +#include <vppinfra/vec.h> +#include <vppinfra/hash.h> +#include <vppinfra/bitmap.h> +#include <vppinfra/fifo.h> +#include <vppinfra/time.h> +#include <vppinfra/mheap.h> +#include <vppinfra/heap.h> +#include <vppinfra/pool.h> +#include <vppinfra/format.h> + +#define MMAP_PAGESIZE (4<<10) +#define SSVM_N_OPAQUE 7 + +typedef struct { + /* Spin-lock */ + volatile u32 lock; + volatile u32 owner_pid; + int recursion_count; + u32 tag; /* for debugging */ + + /* The allocation arena */ + void * heap; + + /* Segment must be mapped at this address, or no supper */ + u64 ssvm_va; + /* The actual mmap size */ + u64 ssvm_size; + u32 master_pid; + u32 slave_pid; + u8 * name; + void * opaque [SSVM_N_OPAQUE]; + + /* Set when the master application thinks it's time to make the donuts */ + volatile u32 ready; + + /* Needed to make unique MAC addresses, etc. */ + u32 master_index; +} ssvm_shared_header_t; + +typedef struct { + ssvm_shared_header_t * sh; + u64 ssvm_size; + u32 my_pid; + u32 vlib_hw_if_index; + u8 * name; + u64 requested_va; + int i_am_master; + u32 per_interface_next_index; + u32 * rx_queue; +} ssvm_private_t; + +always_inline void ssvm_lock (ssvm_shared_header_t * h, u32 my_pid, u32 tag) +{ + if (h->owner_pid == my_pid) + { + h->recursion_count++; + return; + } + + while (__sync_lock_test_and_set (&h->lock, 1)) + ; + + h->owner_pid = my_pid; + h->recursion_count = 1; + h->tag = tag; +} + +always_inline void ssvm_unlock (ssvm_shared_header_t * h) +{ + if (--h->recursion_count == 0) + { + h->owner_pid = 0; + h->tag = 0; + CLIB_MEMORY_BARRIER(); + h->lock = 0; + } +} + +static inline void *ssvm_push_heap (ssvm_shared_header_t *sh) +{ + u8 *oldheap; + oldheap = clib_mem_set_heap(sh->heap); + return ((void *) oldheap); +} + +static inline void ssvm_pop_heap (void *oldheap) +{ + clib_mem_set_heap(oldheap); +} + +#define foreach_ssvm_api_error \ +_(NO_NAME, "No shared segment name", -10) \ +_(NO_SIZE, "Size not set (master)", -11) \ +_(CREATE_FAILURE, "Create failed", -12) \ +_(SET_SIZE, "Set size failed", -13) \ +_(MMAP, "mmap failed", -14) \ +_(SLAVE_TIMEOUT, "Slave map timeout", -15) + +typedef enum { +#define _(n,s,c) SSVM_API_ERROR_##n = c, + foreach_ssvm_api_error +#undef _ +} ssvm_api_error_enum_t; + +#define SSVM_API_ERROR_NO_NAME (-10) + +int ssvm_master_init (ssvm_private_t * ssvm, u32 master_index); +int ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds); + +#endif /* __included_ssvm_h__ */ |