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/*
* Copyright (c) 2017 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_memfd_h__
#define __included_memfd_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>
/* DGMS, memfd syscall not in glibc... */
#include <vppinfra/linux/syscall.h>
#ifndef MMAP_PAGESIZE
#define MMAP_PAGESIZE (clib_mem_get_page_size())
#endif
#define MEMFD_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 memfd_va;
/* The actual mmap size */
u64 memfd_size;
u32 master_pid;
u32 slave_pid;
u8 *name;
void *opaque[MEMFD_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;
} memfd_shared_header_t;
typedef struct
{
memfd_shared_header_t *sh;
int fd;
u64 memfd_size;
u32 my_pid;
u32 vlib_hw_if_index;
uword requested_va;
int i_am_master;
u32 per_interface_next_index;
u32 *rx_queue;
u8 *name;
} memfd_private_t;
always_inline void
memfd_lock (memfd_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
memfd_lock_non_recursive (memfd_shared_header_t * h, u32 tag)
{
while (__sync_lock_test_and_set (&h->lock, 1))
;
h->tag = tag;
}
always_inline void
memfd_unlock (memfd_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
memfd_unlock_non_recursive (memfd_shared_header_t * h)
{
h->tag = 0;
CLIB_MEMORY_BARRIER ();
h->lock = 0;
}
static inline void *
memfd_push_heap (memfd_shared_header_t * sh)
{
u8 *oldheap;
oldheap = clib_mem_set_heap (sh->heap);
return ((void *) oldheap);
}
static inline void
memfd_pop_heap (void *oldheap)
{
clib_mem_set_heap (oldheap);
}
#define foreach_memfd_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) MEMFD_API_ERROR_##n = c,
foreach_memfd_api_error
#undef _
} memfd_api_error_enum_t;
#define MEMFD_API_ERROR_NO_NAME (-10)
int memfd_master_init (memfd_private_t * memfd, u32 master_index);
int memfd_slave_init (memfd_private_t * memfd);
void memfd_delete (memfd_private_t * memfd);
/* These do not belong here, but the original keeps running around... */
/* $$$$ work w/ Damjan to fix properly */
#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE 1024
#endif
#define MFD_ALLOW_SEALING 0x0002U
#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
#define F_SEAL_GROW 0x0004 /* prevent file from growing */
#define F_SEAL_WRITE 0x0008 /* prevent writes */
#endif /* __included_memfd_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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