Move to kernel style SPDX license identifiers

[lttng-ust.git] / libringbuffer / backend_types.h

diff --git a/libringbuffer/backend_types.h b/libringbuffer/backend_types.h
index 3d8bd3cb3392c1f5c3db2d3fc11323e1b29f7081..f821c27fdd0684695866148da84a6e1fd8599e62 100644 (file)
--- a/libringbuffer/backend_types.h
+++ b/libringbuffer/backend_types.h
@@ -1,26 +1,27 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_TYPES_H
-#define _LINUX_RING_BUFFER_BACKEND_TYPES_H
-
 /*
- * linux/ringbuffer/backend_types.h
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2008-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * Ring buffer backend (types).
- *
- * Dual LGPL v2.1/GPL v2 license.
  */
 
+#ifndef _LTTNG_RING_BUFFER_BACKEND_TYPES_H
+#define _LTTNG_RING_BUFFER_BACKEND_TYPES_H
+
 #include <limits.h>
+#include <stdint.h>
 #include "shm_internal.h"
 #include "vatomic.h"
 
+#define RB_BACKEND_PAGES_PADDING       16
 struct lttng_ust_lib_ring_buffer_backend_pages {
        unsigned long mmap_offset;      /* offset of the subbuffer in mmap */
        union v_atomic records_commit;  /* current records committed count */
        union v_atomic records_unread;  /* records to read */
        unsigned long data_size;        /* Amount of data to read from subbuf */
        DECLARE_SHMP(char, p);          /* Backing memory map */
+       char padding[RB_BACKEND_PAGES_PADDING];
 };
 
 struct lttng_ust_lib_ring_buffer_backend_subbuffer {
@@ -28,6 +29,16 @@ struct lttng_ust_lib_ring_buffer_backend_subbuffer {
        unsigned long id;               /* backend subbuffer identifier */
 };
 
+struct lttng_ust_lib_ring_buffer_backend_counts {
+       /*
+        * Counter specific to the sub-buffer location within the ring buffer.
+        * The actual sequence number of the packet within the entire ring
+        * buffer can be derived from the formula nr_subbuffers * seq_cnt +
+        * subbuf_idx.
+        */
+       uint64_t seq_cnt;               /* packet sequence number */
+};
+
 /*
  * Forward declaration of frontend-specific channel and ring_buffer.
  */
@@ -38,11 +49,14 @@ struct lttng_ust_lib_ring_buffer_backend_pages_shmp {
        DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_pages, shmp);
 };
 
+#define RB_BACKEND_RING_BUFFER_PADDING         64
 struct lttng_ust_lib_ring_buffer_backend {
        /* Array of ring_buffer_backend_subbuffer for writer */
        DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_subbuffer, buf_wsb);
        /* ring_buffer_backend_subbuffer for reader */
        struct lttng_ust_lib_ring_buffer_backend_subbuffer buf_rsb;
+       /* Array of lib_ring_buffer_backend_counts for the packet counter */
+       DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_counts, buf_cnt);
        /*
         * Pointer array of backend pages, for whole buffer.
         * Indexed by ring_buffer_backend_subbuffer identifier (id) index.
@@ -54,12 +68,14 @@ struct lttng_ust_lib_ring_buffer_backend {
        int cpu;                        /* This buffer's cpu. -1 if global. */
        union v_atomic records_read;    /* Number of records read */
        unsigned int allocated:1;       /* is buffer allocated ? */
+       char padding[RB_BACKEND_RING_BUFFER_PADDING];
 };
 
 struct lttng_ust_lib_ring_buffer_shmp {
        DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, shmp); /* Channel per-cpu buffers */
 };
 
+#define RB_BACKEND_CHANNEL_PADDING     64
 struct channel_backend {
        unsigned long buf_size;         /* Size of the buffer */
        unsigned long subbuf_size;      /* Sub-buffer size */
@@ -75,7 +91,8 @@ struct channel_backend {
        DECLARE_SHMP(void *, priv_data);/* Client-specific information */
        struct lttng_ust_lib_ring_buffer_config config; /* Ring buffer configuration */
        char name[NAME_MAX];            /* Channel name */
+       char padding[RB_BACKEND_CHANNEL_PADDING];
        struct lttng_ust_lib_ring_buffer_shmp buf[];
 };
 
-#endif /* _LINUX_RING_BUFFER_BACKEND_TYPES_H */
+#endif /* _LTTNG_RING_BUFFER_BACKEND_TYPES_H */