Add a packet sequence number

[lttng-modules.git] / lib / ringbuffer / backend_types.h

diff --git a/lib/ringbuffer/backend_types.h b/lib/ringbuffer/backend_types.h
index 6813dd8b47a4127c3dbacc717c50742f96bbe561..8c53d0754eee633e4bf958c11a82f77fbb95322e 100644 (file)
--- a/lib/ringbuffer/backend_types.h
+++ b/lib/ringbuffer/backend_types.h
@@ -44,6 +44,16 @@ struct lib_ring_buffer_backend_subbuffer {
        unsigned long id;               /* backend subbuffer identifier */
 };
 
+struct 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.
  */
@@ -55,6 +65,8 @@ struct lib_ring_buffer_backend {
        struct lib_ring_buffer_backend_subbuffer *buf_wsb;
        /* ring_buffer_backend_subbuffer for reader */
        struct lib_ring_buffer_backend_subbuffer buf_rsb;
+       /* Array of lib_ring_buffer_backend_counts for the packet counter */
+       struct lib_ring_buffer_backend_counts *buf_cnt;
        /*
         * Pointer array of backend pages, for whole buffer.
         * Indexed by ring_buffer_backend_subbuffer identifier (id) index.
@@ -83,6 +95,8 @@ struct channel_backend {
        unsigned long num_subbuf;       /* Number of sub-buffers for writer */
        u64 start_tsc;                  /* Channel creation TSC value */
        void *priv;                     /* Client-specific information */
+       void *priv_ops;                 /* Client-specific ops pointer */
+       void (*release_priv_ops)(void *priv_ops);
        struct notifier_block cpu_hp_notifier;   /* CPU hotplug notifier */
        /*
         * We need to copy config because the module containing the