/* * 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> #include <vppinfra/linux/syscall.h> #ifndef MMAP_PAGESIZE #define MMAP_PAGESIZE (clib_mem_get_page_size()) #endif #define SSVM_N_OPAQUE 7 typedef enum ssvm_segment_type_ { SSVM_SEGMENT_SHM = 0, SSVM_SEGMENT_MEMFD, SSVM_SEGMENT_PRIVATE, SSVM_N_SEGMENT_TYPES /**< Private segments */ } ssvm_segment_type_t; 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; ssvm_segment_type_t type; } ssvm_shared_header_t; typedef struct { ssvm_shared_header_t *sh; u64 ssvm_size; u32 my_pid; u8 *name; uword requested_va; int i_am_master; union { int fd; /**< memfd segments */ int attach_timeout; /**< shm segments attach timeout (sec) */ }; } 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_lock_non_recursive (ssvm_shared_header_t * h, u32 tag) { while (__sync_lock_test_and_set (&h->lock, 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; } } always_inline void ssvm_unlock_non_recursive (ssvm_shared_header_t * h) { 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); } static inline void * ssvm_mem_alloc (ssvm_private_t * ssvm, uword size) { u8 *oldheap; void *rv; oldheap = clib_mem_set_heap (ssvm->sh->heap); rv = clib_mem_alloc (size); clib_mem_set_heap (oldheap); return (rv); } #define foreach_ssvm_api_error \ _(NO_NAME, "No shared segment name", -100) \ _(NO_SIZE, "Size not set (master)", -101) \ _(CREATE_FAILURE, "Create failed", -102) \ _(SET_SIZE, "Set size failed", -103) \ _(MMAP, "mmap failed", -104) \ _(SLAVE_TIMEOUT, "Slave map timeout", -105) 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, ssvm_segment_type_t type); int ssvm_slave_init (ssvm_private_t * ssvm, ssvm_segment_type_t type); void ssvm_delete (ssvm_private_t * ssvm); int ssvm_master_init_shm (ssvm_private_t * ssvm); int ssvm_slave_init_shm (ssvm_private_t * ssvm); void ssvm_delete_shm (ssvm_private_t * ssvm); int ssvm_master_init_memfd (ssvm_private_t * memfd); int ssvm_slave_init_memfd (ssvm_private_t * memfd); void ssvm_delete_memfd (ssvm_private_t * memfd); int ssvm_master_init_private (ssvm_private_t * ssvm); int ssvm_slave_init_private (ssvm_private_t * ssvm); void ssvm_delete_private (ssvm_private_t * ssvm); ssvm_segment_type_t ssvm_type (const ssvm_private_t * ssvm); u8 *ssvm_name (const ssvm_private_t * ssvm); #endif /* __included_ssvm_h__ */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */