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/*
* 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 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;
u8 *name;
uword requested_va;
int i_am_master;
/* Needed by memfd segments */
int fd;
} 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);
}
#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, u32 master_index);
int ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds);
void ssvm_delete (ssvm_private_t * ssvm);
int ssvm_master_init_memfd (ssvm_private_t * memfd, u32 master_index);
int ssvm_slave_init_memfd (ssvm_private_t * memfd);
void ssvm_delete_memfd (ssvm_private_t * memfd);
#endif /* __included_ssvm_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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