From 344ce4277885e448912fdfc35bcfaf130c74d086 Mon Sep 17 00:00:00 2001 From: Florin Coras Date: Fri, 3 May 2019 11:46:55 -0700 Subject: session/svm: apis for fifo shrinking Change-Id: Ie519683bb90aae6fb95f2a09e251cded1890ed41 Signed-off-by: Florin Coras --- src/vnet/session/segment_manager.c | 31 +++++++++++++++++++++++++++++++ src/vnet/session/segment_manager.h | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) (limited to 'src/vnet') diff --git a/src/vnet/session/segment_manager.c b/src/vnet/session/segment_manager.c index 9a8af3b42fc..6213cd517f6 100644 --- a/src/vnet/session/segment_manager.c +++ b/src/vnet/session/segment_manager.c @@ -682,6 +682,37 @@ segment_manager_grow_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size) return rv; } +int +segment_manager_collect_fifo_chunks (segment_manager_t * sm, svm_fifo_t * f) +{ + fifo_segment_t *fs; + int rv; + + fs = segment_manager_get_segment_w_lock (sm, f->segment_index); + rv = fifo_segment_collect_fifo_chunks (fs, f); + segment_manager_segment_reader_unlock (sm); + + return rv; +} + +int +segment_manager_shrink_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size, + u8 is_producer) +{ + int rv; + + rv = svm_fifo_reduce_size (f, size, is_producer); + + /* Nothing to collect at this point */ + if (!is_producer) + return rv; + + if (f->flags & SVM_FIFO_F_COLLECT_CHUNKS) + segment_manager_collect_fifo_chunks (sm, f); + + return rv; +} + u32 segment_manager_evt_q_expected_size (u32 q_len) { 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, -- cgit 1.2.3-korg