{
u32 next; /**< Next linked-list element pool index */
u32 prev; /**< Previous linked-list element pool index */
-
u32 start; /**< Start of segment, normalized*/
u32 length; /**< Length of segment */
} ooo_segment_t;
#define SVM_FIFO_INVALID_INDEX ((u32)~0)
#define SVM_FIFO_MAX_EVT_SUBSCRIBERS 7
-enum svm_fifo_tx_ntf_
+typedef enum svm_fifo_tx_ntf_
{
SVM_FIFO_NO_TX_NOTIF = 0,
SVM_FIFO_WANT_TX_NOTIF = 1,
SVM_FIFO_WANT_TX_NOTIF_IF_FULL = 2,
-};
+} svm_fifo_tx_ntf_t;
typedef struct
{
typedef struct svm_fifo_chunk_
{
- u32 start_byte;
- u32 length;
- struct svm_fifo_chunk_ *next;
- u8 data[0];
+ u32 start_byte; /**< chunk start byte */
+ u32 length; /**< length of chunk in bytes */
+ struct svm_fifo_chunk_ *next; /**< pointer to next chunk in linked-lists */
+ u8 data[0]; /**< start of chunk data */
} svm_fifo_chunk_t;
typedef enum svm_fifo_flag_
typedef struct _svm_fifo
{
CLIB_CACHE_LINE_ALIGN_MARK (shared_first);
- u32 size; /**< size of the fifo */
- u32 nitems; /**< usable size(size-1) */
+ u32 size; /**< size of the fifo in bytes */
+ u32 nitems; /**< usable size (size-1) */
u8 flags; /**< fifo flags */
svm_fifo_chunk_t *start_chunk;/**< first chunk in fifo chunk list */
svm_fifo_chunk_t *end_chunk; /**< end chunk in fifo chunk list */
CLIB_CACHE_LINE_ALIGN_MARK (shared_second);
volatile u32 has_event; /**< non-zero if deq event exists */
-
- u32 master_session_index;
- u32 client_session_index;
- u8 master_thread_index;
- u8 client_thread_index;
- u32 segment_manager;
- u32 segment_index;
- u32 ct_session_index; /**< Local session index for vpp */
+ u32 master_session_index; /**< session layer session index */
+ u32 client_session_index; /**< app session index */
+ u8 master_thread_index; /**< session layer thread index */
+ u8 client_thread_index; /**< app worker index */
+ u32 segment_manager; /**< session layer segment manager index */
+ u32 segment_index; /**< segment index in segment manager */
u32 freelist_index; /**< aka log2(allocated_size) - const. */
i8 refcnt; /**< reference count */
struct _svm_fifo *next; /**< next in freelist/active chain */
svm_fifo_chunk_t *ooo_enq; /**< last chunk used for ooo enqueue */
ooo_segment_t *ooo_segments; /**< Pool of ooo segments */
u32 ooos_newest; /**< Last segment to have been updated */
- volatile u8 n_subscribers;
+ volatile u8 n_subscribers; /**< Number of subscribers for io events */
u8 subscribers[SVM_FIFO_MAX_EVT_SUBSCRIBERS];
#if SVM_FIFO_TRACE
typedef enum
{
- SVM_FIFO_FULL = -2,
+ SVM_FIFO_EFULL = -2,
+ SVM_FIFO_EEMPTY = -3,
} svm_fifo_err_t;
typedef struct svm_fifo_seg_
u8 *svm_fifo_dump_trace (u8 * s, svm_fifo_t * f);
u8 *svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose);
-/* internal function */
+/**
+ * Load head and tail optimized for consumer
+ *
+ * Internal function.
+ */
static inline void
f_load_head_tail_cons (svm_fifo_t * f, u32 * head, u32 * tail)
{
*tail = clib_atomic_load_acq_n (&f->tail);
}
-/* internal function */
+/** Load head and tail optimized for producer
+ *
+ * Internal function
+ */
static inline void
f_load_head_tail_prod (svm_fifo_t * f, u32 * head, u32 * tail)
{
*head = clib_atomic_load_acq_n (&f->head);
}
-/* producer consumer role independent */
-/* internal function */
+/* Load head and tail independent of producer/consumer role
+ *
+ * Internal function.
+ */
static inline void
f_load_head_tail_all_acq (svm_fifo_t * f, u32 * head, u32 * tail)
{
*head = clib_atomic_load_acq_n (&f->head);
}
-/* internal function */
+/**
+ * Fifo free bytes, i.e., number of free bytes
+ *
+ * Internal function
+ */
static inline u32
f_free_count (svm_fifo_t * f, u32 head, u32 tail)
{
return (f->nitems + head - tail);
}
-/* internal function */
+/**
+ * Fifo current size, i.e., number of bytes enqueued
+ *
+ * Internal function.
+ */
static inline u32
f_cursize (svm_fifo_t * f, u32 head, u32 tail)
{
return (f->nitems - f_free_count (f, head, tail));
}
-/* used by consumer */
+/**
+ * Distance to a from b, i.e., a - b in the fifo
+ *
+ * Internal function.
+ */
+static inline u32
+f_distance_to (svm_fifo_t * f, u32 a, u32 b)
+{
+ return ((f->size + a - b) % f->size);
+}
+
+/**
+ * Distance from a to b, i.e., b - a in the fifo
+ *
+ * Internal function.
+ */
+static inline u32
+f_distance_from (svm_fifo_t * f, u32 a, u32 b)
+{
+ return ((f->size + b - a) % f->size);
+}
+
+/**
+ * Create fifo of requested size
+ *
+ * Allocates fifo on current heap.
+ *
+ * @param size data size in bytes for fifo to be allocated. Will be
+ * rounded to the next highest power-of-two value.
+ * @return pointer to new fifo
+ */
+svm_fifo_t *svm_fifo_create (u32 size);
+/**
+ * Initialize fifo
+ *
+ * @param size size for fifo
+ */
+void svm_fifo_init (svm_fifo_t * f, u32 size);
+/**
+ * Allocate a fifo chunk on heap
+ *
+ * If the chunk is allocated on a fifo segment, this should be called
+ * with the segment's heap pushed.
+ *
+ * @param size chunk size in bytes. Will be rounded to the next highest
+ * power-of-two
+ * @return new chunk or 0 if alloc failed
+ */
+svm_fifo_chunk_t *svm_fifo_chunk_alloc (u32 size);
+/**
+ * Grow fifo size by adding chunk to chunk list
+ *
+ * If fifos are allocated on a segment, this should be called with
+ * the segment's heap pushed.
+ *
+ * @param f fifo to be extended
+ * @param c chunk or linked list of chunks to be added
+ */
+void svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c);
+/**
+ * Free fifo and associated state
+ *
+ * @param f fifo
+ */
+void svm_fifo_free (svm_fifo_t * f);
+/**
+ * Cleanup fifo chunk lookup rb tree
+ *
+ * The rb tree is allocated in segment heap so this should be called
+ * with it pushed.
+ *
+ * @param f fifo to cleanup
+ */
+void svm_fifo_free_chunk_lookup (svm_fifo_t * f);
+/**
+ * Cleanup fifo ooo data
+ *
+ * The ooo data is allocated in producer process memory. The fifo
+ * segment heap should not be pushed.
+ *
+ * @param f fifo to cleanup
+ */
+void svm_fifo_free_ooo_data (svm_fifo_t * f);
+/**
+ * Init fifo head and tail
+ *
+ * @param f fifo
+ * @param head head value that will be matched to a chunk
+ * @param tail tail value that will be matched to a chunk
+ */
+void svm_fifo_init_pointers (svm_fifo_t * f, u32 head, u32 tail);
+/**
+ * Clone fifo
+ *
+ * Clones single/default chunk fifo. It does not work for fifos with
+ * multiple chunks.
+ */
+void svm_fifo_clone (svm_fifo_t * df, svm_fifo_t * sf);
+/**
+ * Enqueue data to fifo
+ *
+ * Data is enqueued and tail pointer is updated atomically. If the new data
+ * enqueued partly overlaps or "touches" an out-of-order segment, said segment
+ * is "consumed" and the number of bytes returned is appropriately updated.
+ *
+ * @param f fifo
+ * @param len length of data to copy
+ * @param src buffer from where to copy the data
+ * @return number of contiguous bytes that can be consumed or error
+ */
+int svm_fifo_enqueue (svm_fifo_t * f, u32 len, const u8 * src);
+/**
+ * Enqueue data to fifo with offset
+ *
+ * Data is enqueued without updating tail pointer. Instead, an out-of-order
+ * list of segments is generated and maintained. Fifo takes care of coalescing
+ * contiguous or overlapping segments.
+ *
+ * @param f fifo
+ * @param offset offset at which to copy the data
+ * @param len len of data to copy
+ * @param src buffer from where to copy the data
+ * @return 0 if enqueue was successful, error otherwise
+ */
+int svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset, u32 len,
+ u8 * src);
+/**
+ * Overwrite fifo head with new data
+ *
+ * This should be typically used by dgram transport protocols that need
+ * to update the dgram header after dequeueing a chunk of data. It assumes
+ * that the dgram header is at most spread over two chunks.
+ *
+ * @param f fifo
+ * @param src src of new data
+ * @param len length of new data
+ */
+void svm_fifo_overwrite_head (svm_fifo_t * f, u8 * src, u32 len);
+/**
+ * Dequeue data from fifo
+ *
+ * Data is dequeued to consumer provided buffer and head is atomically
+ * updated.
+ *
+ * @param f fifo
+ * @param len length of data to dequeue
+ * @param dst buffer to where to dequeue the data
+ * @return number of bytes dequeued or error
+ */
+int svm_fifo_dequeue (svm_fifo_t * f, u32 len, u8 * dst);
+/**
+ * Peek data from fifo
+ *
+ * Data is copied from requested offset into provided dst buffer. Head is
+ * not updated.
+ *
+ * @param f fifo
+ * @param offset offset from which to copy the data
+ * @param len length of data to copy
+ * @param dst buffer to where to dequeue the data
+ * @return number of bytes peeked
+ */
+int svm_fifo_peek (svm_fifo_t * f, u32 offset, u32 len, u8 * dst);
+/**
+ * Dequeue and drop bytes from fifo
+ *
+ * Advances fifo head by requested amount of bytes.
+ *
+ * @param f fifo
+ * @param len number of bytes to drop
+ * @return number of bytes dropped
+ */
+int svm_fifo_dequeue_drop (svm_fifo_t * f, u32 len);
+/**
+ * Dequeue and drop all bytes from fifo
+ *
+ * Advances head to tail position.
+ *
+ * @param f fifo
+ */
+void svm_fifo_dequeue_drop_all (svm_fifo_t * f);
+int svm_fifo_segments (svm_fifo_t * f, svm_fifo_seg_t * fs);
+void svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_seg_t * fs);
+/**
+ * Add io events subscriber to list
+ *
+ * @param f fifo
+ * @param sub subscriber opaque index (typically app worker index)
+ */
+void svm_fifo_add_subscriber (svm_fifo_t * f, u8 sub);
+/**
+ * Remove io events subscriber form list
+ *
+ * @param f fifo
+ * @param sub subscriber index to be removed
+ */
+void svm_fifo_del_subscriber (svm_fifo_t * f, u8 subscriber);
+/**
+ * Number of out-of-order segments for fifo
+ *
+ * @param f fifo
+ * @return number of out of order segments
+ */
+u32 svm_fifo_n_ooo_segments (svm_fifo_t * f);
+/*
+ * First out-of-order segment for fifo
+ *
+ * @param f fifo
+ * @return first out-of-order segment for fifo
+ */
+ooo_segment_t *svm_fifo_first_ooo_segment (svm_fifo_t * f);
+format_function_t format_svm_fifo;
+
+/**
+ * Fifo max bytes to dequeue optimized for consumer
+ *
+ * @param f fifo
+ * @return max number of bytes that can be dequeued
+ */
static inline u32
svm_fifo_max_dequeue_cons (svm_fifo_t * f)
{
return f_cursize (f, head, tail);
}
-/* used by producer*/
+/**
+ * Fifo max bytes to dequeue optimized for producer
+ *
+ * @param f fifo
+ * @return max number of bytes that can be dequeued
+ */
static inline u32
svm_fifo_max_dequeue_prod (svm_fifo_t * f)
{
return f_cursize (f, head, tail);
}
-/* use producer or consumer specific functions for perfomance.
- * svm_fifo_max_dequeue_cons (svm_fifo_t *f)
- * svm_fifo_max_dequeue_prod (svm_fifo_t *f)
+/**
+ * Fifo max bytes to dequeue
+ *
+ * Note: use producer or consumer specific functions for performance:
+ * @ref svm_fifo_max_dequeue_cons (svm_fifo_t *f)
+ * @ref svm_fifo_max_dequeue_prod (svm_fifo_t *f)
*/
static inline u32
svm_fifo_max_dequeue (svm_fifo_t * f)
return f_cursize (f, head, tail);
}
-/* used by producer */
+/**
+ * Check if fifo is full optimized for producer
+ *
+ * @param f fifo
+ * @return 1 if fifo is full 0 otherwise
+ */
static inline int
svm_fifo_is_full_prod (svm_fifo_t * f)
{
return (svm_fifo_max_dequeue_prod (f) == f->nitems);
}
-/* use producer or consumer specific functions for perfomance.
- * svm_fifo_is_full_prod (svm_fifo_t * f)
+/* Check if fifo is full.
+ *
+ * Note: use producer or consumer specific functions for performance.
+ * @ref svm_fifo_is_full_prod (svm_fifo_t * f)
* add cons version if needed
*/
static inline int
return (svm_fifo_max_dequeue (f) == f->nitems);
}
-/* used by consumer */
+/**
+ * Check if fifo is empty optimized for consumer
+ *
+ * @param f fifo
+ * @return 1 if fifo is empty 0 otherwise
+ */
static inline int
svm_fifo_is_empty_cons (svm_fifo_t * f)
{
return (svm_fifo_max_dequeue_cons (f) == 0);
}
-/* used by producer */
+/**
+ * Check if fifo is empty optimized for producer
+ *
+ * @param f fifo
+ * @return 1 if fifo is empty 0 otherwise
+ */
static inline int
svm_fifo_is_empty_prod (svm_fifo_t * f)
{
return (svm_fifo_max_dequeue_prod (f) == 0);
}
-/* use producer or consumer specific functions for perfomance.
- * svm_fifo_is_empty_cons (svm_fifo_t * f)
- * svm_fifo_is_empty_prod (svm_fifo_t * f)
+/**
+ * Check if fifo is empty
+ *
+ * Note: use producer or consumer specific functions for perfomance.
+ * @ref svm_fifo_is_empty_cons (svm_fifo_t * f)
+ * @ref svm_fifo_is_empty_prod (svm_fifo_t * f)
*/
static inline int
svm_fifo_is_empty (svm_fifo_t * f)
return (svm_fifo_max_dequeue (f) == 0);
}
+/**
+ * Check if fifo is wrapped
+ *
+ * @param f fifo
+ * @return 1 if 'normalized' head is ahead of tail
+ */
static inline u8
svm_fifo_is_wrapped (svm_fifo_t * f)
{
return head % f->size > tail % f->size;
}
-/* used by producer*/
+/**
+ * Maximum number of bytes that can be enqueued into fifo
+ *
+ * Optimized for producer
+ *
+ * @param f fifo
+ * @return max number of bytes that can be enqueued into fifo
+ */
static inline u32
svm_fifo_max_enqueue_prod (svm_fifo_t * f)
{
return f_free_count (f, head, tail);
}
-/* use producer or consumer specfic functions for perfomance.
- * svm_fifo_max_enqueue_prod (svm_fifo_t *f)
+/* Maximum number of bytes that can be enqueued into fifo
+ *
+ * Note: use producer or consumer specific functions for performance.
+ * @ref svm_fifo_max_enqueue_prod (svm_fifo_t *f)
* add consumer specific version if needed.
*/
static inline u32
return f_free_count (f, head, tail);
}
-static inline int
-svm_fifo_has_event (svm_fifo_t * f)
-{
- return f->has_event;
-}
-
-static inline u8
-svm_fifo_has_ooo_data (svm_fifo_t * f)
-{
- return f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX;
-}
-
-/**
- * Sets fifo event flag.
- *
- * Also acts as a release ordering.
- *
- * @return 1 if flag was not set.
- */
-always_inline u8
-svm_fifo_set_event (svm_fifo_t * f)
-{
- /* return __sync_lock_test_and_set (&f->has_event, 1) == 0;
- return __sync_bool_compare_and_swap (&f->has_event, 0, 1); */
- return !clib_atomic_swap_rel_n (&f->has_event, 1);
-}
-
-/**
- * Unsets fifo event flag.
- *
- * Also acts as an acquire barrier.
- */
-always_inline void
-svm_fifo_unset_event (svm_fifo_t * f)
-{
- clib_atomic_swap_acq_n (&f->has_event, 0);
-}
-
-svm_fifo_t *svm_fifo_create (u32 data_size_in_bytes);
-void svm_fifo_init (svm_fifo_t * f, u32 size);
-
-/**
- * Allocate a fifo chunk on heap
- *
- * If the chunk is allocated on a fifo segment, this should be called
- * with the segment's heap pushed.
- *
- * @param size chunk size in bytes. Will be rounded to the next highest
- * power-of-two
- * @return new chunk or 0 if alloc failed
- */
-svm_fifo_chunk_t *svm_fifo_chunk_alloc (u32 size);
-
-/**
- * Grow fifo size by adding chunk to chunk list
- *
- * If fifos are allocated on a segment, this should be called with
- * the segment's heap pushed.
- *
- * @param f fifo to be extended
- * @param c chunk or linked list of chunks to be added
- */
-void svm_fifo_add_chunk (svm_fifo_t * f, svm_fifo_chunk_t * c);
-void svm_fifo_free (svm_fifo_t * f);
-/**
- * Cleanup fifo chunk lookup rb tree
- *
- * The rb tree is allocated in segment heap so this should be called
- * with it pushed.
- *
- * @param f fifo to cleanup
- */
-void svm_fifo_free_chunk_lookup (svm_fifo_t * f);
-/**
- * Cleanup fifo ooo data
- *
- * The ooo data is allocated in producer process memory. The fifo
- * segment heap should not be pushed.
- *
- * @param f fifo to cleanup
- */
-void svm_fifo_free_ooo_data (svm_fifo_t * f);
-
-int svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 max_bytes,
- const u8 * copy_from_here);
-int svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset,
- u32 required_bytes, u8 * copy_from_here);
-int svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 max_bytes, u8 * copy_here);
-
-int svm_fifo_peek (svm_fifo_t * f, u32 offset, u32 max_bytes, u8 * copy_here);
-int svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes);
-void svm_fifo_dequeue_drop_all (svm_fifo_t * f);
-int svm_fifo_segments (svm_fifo_t * f, svm_fifo_seg_t * fs);
-void svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_seg_t * fs);
-void svm_fifo_init_pointers (svm_fifo_t * f, u32 head, u32 tail);
-void svm_fifo_clone (svm_fifo_t * df, svm_fifo_t * sf);
-void svm_fifo_overwrite_head (svm_fifo_t * f, u8 * data, u32 len);
-void svm_fifo_add_subscriber (svm_fifo_t * f, u8 subscriber);
-void svm_fifo_del_subscriber (svm_fifo_t * f, u8 subscriber);
-format_function_t format_svm_fifo;
-
/**
* Max contiguous chunk of data that can be read
*/
-always_inline u32
+static inline u32
svm_fifo_max_read_chunk (svm_fifo_t * f)
{
u32 head, tail;
/**
* Max contiguous chunk of data that can be written
*/
-always_inline u32
+static inline u32
svm_fifo_max_write_chunk (svm_fifo_t * f)
{
u32 head, tail;
* Advance tail pointer
*
* Useful for moving tail pointer after external enqueue.
+ *
+ * @param f fifo
+ * @param len number of bytes to add to tail
*/
-always_inline void
-svm_fifo_enqueue_nocopy (svm_fifo_t * f, u32 bytes)
+static inline void
+svm_fifo_enqueue_nocopy (svm_fifo_t * f, u32 len)
{
- ASSERT (bytes <= svm_fifo_max_enqueue_prod (f));
+ ASSERT (len <= svm_fifo_max_enqueue_prod (f));
/* load-relaxed: producer owned index */
u32 tail = f->tail;
- tail += bytes;
+ tail += len;
/* store-rel: producer owned index (paired with load-acq in consumer) */
clib_atomic_store_rel_n (&f->tail, tail);
}
-always_inline u8 *
+static inline u8 *
svm_fifo_head (svm_fifo_t * f)
{
/* load-relaxed: consumer owned index */
+ ((f->head % f->size) - f->head_chunk->start_byte));
}
-always_inline u8 *
+static inline u8 *
svm_fifo_tail (svm_fifo_t * f)
{
/* load-relaxed: producer owned index */
+ ((f->tail % f->size) - f->tail_chunk->start_byte));
}
+static inline u8
+svm_fifo_n_subscribers (svm_fifo_t * f)
+{
+ return f->n_subscribers;
+}
+
+/**
+ * Check if fifo has out-of-order data
+ *
+ * @param f fifo
+ * @return 1 if fifo has ooo data, 0 otherwise
+ */
+static inline u8
+svm_fifo_has_ooo_data (svm_fifo_t * f)
+{
+ return f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX;
+}
+
+static inline ooo_segment_t *
+svm_fifo_newest_ooo_segment (svm_fifo_t * f)
+{
+ if (f->ooos_newest == OOO_SEGMENT_INVALID_INDEX)
+ return 0;
+ return pool_elt_at_index (f->ooo_segments, f->ooos_newest);
+}
+
+static inline void
+svm_fifo_newest_ooo_segment_reset (svm_fifo_t * f)
+{
+ f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
+}
+
+static inline u32
+ooo_segment_offset_prod (svm_fifo_t * f, ooo_segment_t * s)
+{
+ u32 tail;
+ /* load-relaxed: producer owned index */
+ tail = f->tail;
+
+ return f_distance_to (f, s->start, tail);
+}
+
+static inline u32
+ooo_segment_length (svm_fifo_t * f, ooo_segment_t * s)
+{
+ return s->length;
+}
+
+/**
+ * Check if fifo has io event
+ *
+ * @param f fifo
+ * @return 1 if fifo has event, 0 otherwise
+ */
+static inline int
+svm_fifo_has_event (svm_fifo_t * f)
+{
+ return f->has_event;
+}
+
+/**
+ * Set fifo event flag.
+ *
+ * Forces release semantics.
+ *
+ * @param f fifo
+ * @return 1 if flag was not set, 0 otherwise
+ */
+always_inline u8
+svm_fifo_set_event (svm_fifo_t * f)
+{
+ return !clib_atomic_swap_rel_n (&f->has_event, 1);
+}
+
+/**
+ * Unset fifo event flag.
+ *
+ * Forces acquire semantics
+ *
+ * @param f fifo
+ */
+always_inline void
+svm_fifo_unset_event (svm_fifo_t * f)
+{
+ clib_atomic_swap_acq_n (&f->has_event, 0);
+}
+
+/**
+ * Set specific want tx notification flag
+ *
+ * For list of flags see @ref svm_fifo_tx_ntf_t
+ *
+ * @param f fifo
+ * @param ntf_type type of notification requested
+ */
static inline void
svm_fifo_add_want_tx_ntf (svm_fifo_t * f, u8 ntf_type)
{
f->want_tx_ntf |= ntf_type;
}
+/**
+ * Clear specific want tx notification flag
+ *
+ * For list of flags see @ref svm_fifo_tx_ntf_t
+ *
+ * @param f fifo
+ * @param ntf_type type of notification to be cleared
+ */
static inline void
svm_fifo_del_want_tx_ntf (svm_fifo_t * f, u8 ntf_type)
{
f->want_tx_ntf &= ~ntf_type;
}
+/**
+ * Clear the want tx notification flag and set has tx notification
+ *
+ * Should be used after enqueuing a tx event. This clears the
+ * SVM_FIFO_WANT_TX_NOTIF flag but it does not clear
+ * SVM_FIFO_WANT_TX_NOTIF_IF_FULL. If the latter was set, has_tx_ntf is
+ * set to avoid enqueueing tx events for for all dequeue operations until
+ * it is manually cleared.
+ *
+ * @param f fifo
+ */
static inline void
svm_fifo_clear_tx_ntf (svm_fifo_t * f)
{
svm_fifo_del_want_tx_ntf (f, SVM_FIFO_WANT_TX_NOTIF);
}
+/**
+ * Clear has tx notification flag
+ *
+ * The fifo generates only one event per SVM_FIFO_WANT_TX_NOTIF_IF_FULL
+ * request and sets has_tx_ntf. To received new events the flag must be
+ * cleared using this function.
+ *
+ * @param f fifo
+ */
static inline void
svm_fifo_reset_tx_ntf (svm_fifo_t * f)
{
f->has_tx_ntf = 0;
}
+/**
+ * Check if fifo needs tx notification
+ *
+ * Determines based on tx notification request flags and state of the fifo if
+ * a tx io event should be generated.
+ *
+ * @param f fifo
+ * @param n_last_deq number of bytes last dequeued
+ * @return 1 if tx io event should be generated, 0 otherwise
+ */
static inline u8
svm_fifo_needs_tx_ntf (svm_fifo_t * f, u32 n_last_deq)
{
return 0;
}
-always_inline u8
-svm_fifo_n_subscribers (svm_fifo_t * f)
-{
- return f->n_subscribers;
-}
-
-u32 svm_fifo_number_ooo_segments (svm_fifo_t * f);
-ooo_segment_t *svm_fifo_first_ooo_segment (svm_fifo_t * f);
-
-always_inline ooo_segment_t *
-svm_fifo_newest_ooo_segment (svm_fifo_t * f)
-{
- if (f->ooos_newest == OOO_SEGMENT_INVALID_INDEX)
- return 0;
- return pool_elt_at_index (f->ooo_segments, f->ooos_newest);
-}
-
-always_inline void
-svm_fifo_newest_ooo_segment_reset (svm_fifo_t * f)
-{
- f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
-}
-
-always_inline u32
-ooo_segment_distance_from_tail (svm_fifo_t * f, u32 pos, u32 tail)
-{
- return ((f->size + pos - tail) % f->size);
-}
-
-always_inline u32
-ooo_segment_distance_to_tail (svm_fifo_t * f, u32 pos, u32 tail)
-{
- return ((f->size + tail - pos) % f->size);
-}
-
-always_inline u32
-ooo_segment_offset_prod (svm_fifo_t * f, ooo_segment_t * s)
-{
- u32 tail;
- /* load-relaxed: producer owned index */
- tail = f->tail;
-
- return ooo_segment_distance_from_tail (f, s->start, tail);
-}
-
-always_inline u32
-ooo_segment_length (svm_fifo_t * f, ooo_segment_t * s)
-{
- return s->length;
-}
-
-always_inline ooo_segment_t *
-ooo_segment_get_prev (svm_fifo_t * f, ooo_segment_t * s)
-{
- if (s->prev == OOO_SEGMENT_INVALID_INDEX)
- return 0;
- return pool_elt_at_index (f->ooo_segments, s->prev);
-}
-
-always_inline ooo_segment_t *
-ooo_segment_next (svm_fifo_t * f, ooo_segment_t * s)
-{
- if (s->next == OOO_SEGMENT_INVALID_INDEX)
- return 0;
- return pool_elt_at_index (f->ooo_segments, s->next);
-}
-
#endif /* __included_ssvm_fifo_h__ */
/*
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