[dpdk-dev] [PATCH] lib/compressdev: clarify usage of op structure

Fiona Trahe fiona.trahe at intel.com
Sat Oct 27 02:13:54 CEST 2018

Add note on usage of op structure and when it can be
accessed and freed.

Fixes: 63f4bfd5328b ("compressdev: add enqueue/dequeue functions")
Cc: stable at dpdk.org

Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
 lib/librte_compressdev/rte_compressdev.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/librte_compressdev/rte_compressdev.h b/lib/librte_compressdev/rte_compressdev.h
index 5b4fca4..7b68170 100644
--- a/lib/librte_compressdev/rte_compressdev.h
+++ b/lib/librte_compressdev/rte_compressdev.h
@@ -408,6 +408,13 @@ rte_compressdev_dequeue_burst(uint8_t dev_id, uint16_t qp_id,
  * @note All compression operations are Out-of-place (OOP) operations,
  * as the size of the output data is different to the size of the input data.
+ * @note The rte_comp_op contains both input and output parameters and is the
+ * vehicle for the application to pass data into and out of the PMD. While an
+ * op is inflight, i.e. once it has been enqueued, the private_xform or stream
+ * attached to it and any mbufs or memory referenced by it should not be altered
+ * or freed by the application. The PMD may use or change some of this data at
+ * any time until it has been returned in a dequeue operation.
+ *
  * @note The flush flag only applies to operations which return SUCCESS.
  * In OUT_OF_SPACE cases whether STATEFUL or STATELESS, data in dest buffer
  * is as if flush flag was FLUSH_NONE.

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