[dpdk-dev] [PATCH v3] doc/compress: clarify error handling on data-plane
fiona.trahe at intel.com
Wed May 15 13:16:07 CEST 2019
Fixed some typos and clarified how errors on ops which
fail to get submitted on the enqueue API should be handled.
Fixes: a584d3bea902 ("doc: add compressdev library guide")
cc: stable at dpdk.org
Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
- change proposal so appl must check status of op_enqueued+1 if
all ops are not enqueued.
- changed "0 or undefined" to just "undefined" as 0 is superfluous.
doc/guides/prog_guide/compressdev.rst | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/doc/guides/prog_guide/compressdev.rst b/doc/guides/prog_guide/compressdev.rst
index a06c835a0..bd9bebce6 100644
@@ -201,7 +201,7 @@ for stateful processing of ops.
Each operation carries a status information updated by PMD after it is processed.
-following are currently supported status:
+Following are currently supported:
Operation is successfully completed
@@ -227,14 +227,24 @@ following are currently supported status:
is not an error case. Output data up to op.produced can be used and
next op in the stream should continue on from op.consumed+1.
+Operation status after enqueue / dequeue
+Some of the above values may arise in the op after an
+``rte_compressdev_enqueue_burst()``. If number ops enqueued < number ops requested then
+the app should check the op.status of nb_enqd+1. If status is RTE_COMP_OP_STATUS_NOT_PROCESSED,
+it likely indicates a full-queue case for a hardware device and a retry after dequeuing some ops is likely
+to be successful. If the op holds any other status, e.g. RTE_COMP_OP_STATUS_INVALID_ARGS, a retry with
+the same op is unlikely to be successful.
Produced, Consumed And Operation Status
- If status is RTE_COMP_OP_STATUS_SUCCESS,
consumed = amount of data read from input buffer, and
produced = amount of data written in destination buffer
-- If status is RTE_COMP_OP_STATUS_FAILURE,
- consumed = produced = 0 or undefined
+- If status is RTE_COMP_OP_STATUS_ERROR,
+ consumed = produced = undefined
- If status is RTE_COMP_OP_STATUS_OUT_OF_SPACE_TERMINATED,
consumed = 0 and
produced = usually 0, but in decompression cases a PMD may return > 0
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