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Diffstat (limited to 'src/vnet/session/segment_manager.h')
| -rw-r--r-- | src/vnet/session/segment_manager.h | 34 |
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, |