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authorFlorin Coras <fcoras@cisco.com>2019-05-03 11:46:55 -0700
committerFlorin Coras <florin.coras@gmail.com>2019-05-03 20:27:45 +0000
commit344ce4277885e448912fdfc35bcfaf130c74d086 (patch)
treee2ecaf3ad0c4ca224a32815af44ffd781bcfae5d /src/vnet/session/segment_manager.h
parenta7570b0378b071129937a89a5632011a962cdb43 (diff)
session/svm: apis for fifo shrinking
Change-Id: Ie519683bb90aae6fb95f2a09e251cded1890ed41 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session/segment_manager.h')
-rw-r--r--src/vnet/session/segment_manager.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/vnet/session/segment_manager.h b/src/vnet/session/segment_manager.h
index cbf8e353522..8358c50ba06 100644
--- a/src/vnet/session/segment_manager.h
+++ b/src/vnet/session/segment_manager.h
@@ -125,6 +125,40 @@ void segment_manager_dealloc_fifos (svm_fifo_t * rx_fifo,
*/
int segment_manager_grow_fifo (segment_manager_t * sm, svm_fifo_t * f,
u32 size);
+
+/**
+ * Request to shrink fifo owned by segment manager
+ *
+ * If this is not called by the producer, no attempt is made to reduce the
+ * size until the producer tries to enqueue more data. To collect the chunks
+ * that are to be removed call @ref segment_manager_collect_fifo_chunks
+ *
+ * Size reduction does not affect fifo chunk boundaries. Therefore chunks are
+ * not split and the amount of bytes to be removed can be equal to or less
+ * than what was requested.
+ *
+ * @param sm segment manager that owns the fifo
+ * @param f fifo to be shrunk
+ * @param size amount of bytes to remove from fifo
+ * @param is_producer flag that indicates is caller is the producer for the
+ * fifo.
+ * @return actual number of bytes to be removed
+ */
+int segment_manager_shrink_fifo (segment_manager_t * sm, svm_fifo_t * f,
+ u32 size, u8 is_producer);
+
+/**
+ * Collect fifo chunks that are no longer used
+ *
+ * This should not be called unless SVM_FIFO_F_COLLECT_CHUNKS is set for
+ * the fifo. The chunks are returned to the fifo segment freelist.
+ *
+ * @param sm segment manager that owns the fifo
+ * @param f fifo whose chunks are to be collected
+ * @return 0 on success, error otherwise
+ */
+int segment_manager_collect_fifo_chunks (segment_manager_t * sm,
+ svm_fifo_t * f);
u8 segment_manager_has_fifos (segment_manager_t * sm);
svm_msg_q_t *segment_manager_alloc_queue (fifo_segment_t * fs,