[dpdk-dev] [PATCH] compress/qat: fixed overflow status return from qat pmd

[Adam Dybkowski <adamx.dybkowski@intel.com>]

This patch fixes fail status returned from compression PMD
in case destination buffer size in not enough to store
all data.

Fixes: 3dc9ef2d23fe ("compress/qat: fix returned status on overflow")
Signed-off-by: Adam Dybkowski <adamx.dybkowski@intel.com>
---
 drivers/compress/qat/qat_comp.c | 21 +++++++++++++++++++++
 drivers/compress/qat/qat_comp.h |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/drivers/compress/qat/qat_comp.c b/drivers/compress/qat/qat_comp.c
index dd0fe1b..ef6cda5 100644
--- a/drivers/compress/qat/qat_comp.c
+++ b/drivers/compress/qat/qat_comp.c
@@ -170,6 +170,19 @@ qat_comp_build_request(void *in_op, uint8_t *out_msg,
 		    rte_pktmbuf_mtophys_offset(op->m_dst, op->dst.offset);
 	}
 
+	if (unlikely(rte_pktmbuf_pkt_len(op->m_dst) < QAT_MIN_OUT_BUF_SIZE)) {
+		/* QAT doesn't support dest. buffer lower
+		 * than QAT_MIN_OUT_BUF_SIZE. Propagate error mark
+		 * by converting this request to the null one
+		 * and check the status in the response.
+		 */
+		QAT_DP_LOG(ERR, "QAT dest. buffer overflow");
+		comp_req->comn_hdr.service_type = ICP_QAT_FW_COMN_REQ_NULL;
+		comp_req->comn_hdr.service_cmd_id = ICP_QAT_FW_NULL_REQ_SERV_ID;
+		op->status = RTE_COMP_OP_STATUS_OUT_OF_SPACE_TERMINATED;
+	} else
+		op->status = RTE_COMP_OP_STATUS_SUCCESS;
+
 #if RTE_LOG_DP_LEVEL >= RTE_LOG_DEBUG
 	QAT_DP_LOG(DEBUG, "Direction: %s",
 	    qat_xform->qat_comp_request_type == QAT_COMP_REQUEST_DECOMPRESS ?
@@ -201,6 +214,14 @@ qat_comp_process_response(void **op, uint8_t *resp, uint64_t *dequeue_err_count)
 			sizeof(struct icp_qat_fw_comp_resp));
 #endif
 
+	if (unlikely(rx_op->status != RTE_COMP_OP_STATUS_SUCCESS)) {
+		++(*dequeue_err_count);
+		rx_op->debug_status =
+			*((uint16_t *)(&resp_msg->comn_resp.comn_error));
+		*op = (void *)rx_op;
+		return 0;
+	}
+
 	if (likely(qat_xform->qat_comp_request_type
 			!= QAT_COMP_REQUEST_DECOMPRESS)) {
 		if (unlikely(ICP_QAT_FW_COMN_HDR_CNV_FLAG_GET(
diff --git a/drivers/compress/qat/qat_comp.h b/drivers/compress/qat/qat_comp.h
index 1312ee9..aadf01e 100644
--- a/drivers/compress/qat/qat_comp.h
+++ b/drivers/compress/qat/qat_comp.h
@@ -24,6 +24,8 @@
 /* fallback to fixed compression threshold */
 #define QAT_FALLBACK_THLD ((uint32_t)(RTE_PMD_QAT_COMP_IM_BUFFER_SIZE / 1.1))
 
+#define QAT_MIN_OUT_BUF_SIZE 47
+
 enum qat_comp_request_type {
 	QAT_COMP_REQUEST_FIXED_COMP_STATELESS,
 	QAT_COMP_REQUEST_DYNAMIC_COMP_STATELESS,
-- 
2.7.5