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-rw-r--r--src/svm/memfd.h194
1 files changed, 194 insertions, 0 deletions
diff --git a/src/svm/memfd.h b/src/svm/memfd.h
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+++ b/src/svm/memfd.h
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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:
+ */