[dpdk-dev] [PATCH v1] crypto/qat: add DOCSIS performance optimization

[David Coyle <david.coyle@intel.com>]

DOCSIS protocol performance in the downlink direction can be improved
significantly in the QAT SYM PMD, especially for larger packets, by
pre-processing all CRC generations in a batch before building and
enqueuing any requests to the HW. This patch adds this optimization.

Fixes: 6f0ef237404b ("crypto/qat: support DOCSIS protocol")

Signed-off-by: David Coyle <david.coyle@intel.com>
---
 drivers/common/qat/qat_qp.c  |  2 +
 drivers/crypto/qat/qat_sym.c | 75 ++++++++----------------------------
 drivers/crypto/qat/qat_sym.h | 57 +++++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 58 deletions(-)

diff --git a/drivers/common/qat/qat_qp.c b/drivers/common/qat/qat_qp.c
index aacd4ab21..6fd836fdb 100644
--- a/drivers/common/qat/qat_qp.c
+++ b/drivers/common/qat/qat_qp.c
@@ -627,6 +627,8 @@ qat_enqueue_op_burst(void *qp, void **ops, uint16_t nb_ops)
 		}
 	}
 
+	if (tmp_qp->service_type == QAT_SERVICE_SYMMETRIC)
+		qat_sym_preprocess_requests(ops, nb_ops_possible);
 
 	while (nb_ops_sent != nb_ops_possible) {
 		if (tmp_qp->service_type == QAT_SERVICE_SYMMETRIC) {
diff --git a/drivers/crypto/qat/qat_sym.c b/drivers/crypto/qat/qat_sym.c
index e6bf11523..e3f98a76b 100644
--- a/drivers/crypto/qat/qat_sym.c
+++ b/drivers/crypto/qat/qat_sym.c
@@ -9,9 +9,6 @@
 #include <rte_crypto_sym.h>
 #include <rte_bus_pci.h>
 #include <rte_byteorder.h>
-#ifdef RTE_LIBRTE_SECURITY
-#include <rte_net_crc.h>
-#endif
 
 #include "qat_sym.h"
 
@@ -102,29 +99,6 @@ qat_bpicipher_preprocess(struct qat_sym_session *ctx,
 	return sym_op->cipher.data.length - last_block_len;
 }
 
-#ifdef RTE_LIBRTE_SECURITY
-static inline void
-qat_crc_generate(struct qat_sym_session *ctx,
-			struct rte_crypto_op *op)
-{
-	struct rte_crypto_sym_op *sym_op = op->sym;
-	uint32_t *crc, crc_data_len;
-	uint8_t *crc_data;
-
-	if (ctx->qat_dir == ICP_QAT_HW_CIPHER_ENCRYPT &&
-			sym_op->auth.data.length != 0) {
-
-		crc_data_len = sym_op->auth.data.length;
-		crc_data = rte_pktmbuf_mtod_offset(sym_op->m_src, uint8_t *,
-				sym_op->auth.data.offset);
-		crc = (uint32_t *)(crc_data + crc_data_len);
-
-		*crc = rte_net_crc_calc(crc_data, crc_data_len,
-				RTE_NET_CRC32_ETH);
-	}
-}
-#endif
-
 static inline void
 set_cipher_iv(uint16_t iv_length, uint16_t iv_offset,
 		struct icp_qat_fw_la_cipher_req_params *cipher_param,
@@ -187,7 +161,6 @@ qat_sym_build_request(void *in_op, uint8_t *out_msg,
 	uint64_t auth_data_end = 0;
 	uint8_t do_sgl = 0;
 	uint8_t in_place = 1;
-	uint8_t is_docsis_sec = 0;
 	int alignment_adjustment = 0;
 	struct rte_crypto_op *op = (struct rte_crypto_op *)in_op;
 	struct qat_sym_op_cookie *cookie =
@@ -211,13 +184,23 @@ qat_sym_build_request(void *in_op, uint8_t *out_msg,
 	} else {
 		ctx = (struct qat_sym_session *)get_sec_session_private_data(
 				op->sym->sec_session);
-		if (ctx && ctx->bpi_ctx == NULL) {
-			QAT_DP_LOG(ERR, "QAT PMD only supports security"
-					" operation requests for DOCSIS, op"
-					" (%p) is not for DOCSIS.", op);
-			return -EINVAL;
+		if (likely(ctx)) {
+			if (unlikely(ctx->bpi_ctx == NULL)) {
+				QAT_DP_LOG(ERR, "QAT PMD only supports security"
+						" operation requests for"
+						" DOCSIS, op (%p) is not for"
+						" DOCSIS.", op);
+				return -EINVAL;
+			} else if (unlikely(((op->sym->m_dst != NULL) &&
+					(op->sym->m_dst != op->sym->m_src)) ||
+					op->sym->m_src->nb_segs > 1)) {
+				QAT_DP_LOG(ERR, "OOP and/or multi-segment"
+						" buffers not supported for"
+						" DOCSIS security.");
+				op->status = RTE_CRYPTO_OP_STATUS_INVALID_ARGS;
+				return -EINVAL;
+			}
 		}
-		is_docsis_sec = 1;
 #endif
 	}
 
@@ -281,31 +264,7 @@ qat_sym_build_request(void *in_op, uint8_t *out_msg,
 			cipher_ofs = op->sym->cipher.data.offset >> 3;
 
 		} else if (ctx->bpi_ctx) {
-			/* DOCSIS processing */
-#ifdef RTE_LIBRTE_SECURITY
-			if (is_docsis_sec) {
-				/* Check for OOP or multi-segment buffers */
-				if (unlikely(((op->sym->m_dst != NULL) &&
-						(op->sym->m_dst !=
-						op->sym->m_src)) ||
-						op->sym->m_src->nb_segs > 1)) {
-					QAT_DP_LOG(ERR,
-						"OOP and/or multi-segment "
-						"buffers are not supported for "
-						"DOCSIS security");
-					op->status =
-					RTE_CRYPTO_OP_STATUS_INVALID_ARGS;
-					return -EINVAL;
-				}
-
-				/* Calculate CRC */
-				qat_crc_generate(ctx, op);
-			}
-#else
-			RTE_SET_USED(is_docsis_sec);
-#endif
-
-			/* Only send complete blocks to device.
+			/* DOCSIS - only send complete blocks to device.
 			 * Process any partial block using CFB mode.
 			 * Even if 0 complete blocks, still send this to device
 			 * to get into rx queue for post-process and dequeuing
diff --git a/drivers/crypto/qat/qat_sym.h b/drivers/crypto/qat/qat_sym.h
index 7934dd478..1a9748849 100644
--- a/drivers/crypto/qat/qat_sym.h
+++ b/drivers/crypto/qat/qat_sym.h
@@ -158,6 +158,57 @@ qat_crc_verify(struct qat_sym_session *ctx, struct rte_crypto_op *op)
 			op->status = RTE_CRYPTO_OP_STATUS_AUTH_FAILED;
 	}
 }
+
+static inline void
+qat_crc_generate(struct qat_sym_session *ctx,
+			struct rte_crypto_op *op)
+{
+	struct rte_crypto_sym_op *sym_op = op->sym;
+	uint32_t *crc, crc_data_len;
+	uint8_t *crc_data;
+
+	if (ctx->qat_dir == ICP_QAT_HW_CIPHER_ENCRYPT &&
+			sym_op->auth.data.length != 0 &&
+			sym_op->m_src->nb_segs == 1) {
+
+		crc_data_len = sym_op->auth.data.length;
+		crc_data = rte_pktmbuf_mtod_offset(sym_op->m_src, uint8_t *,
+				sym_op->auth.data.offset);
+		crc = (uint32_t *)(crc_data + crc_data_len);
+		*crc = rte_net_crc_calc(crc_data, crc_data_len,
+				RTE_NET_CRC32_ETH);
+	}
+}
+
+static inline void
+qat_sym_preprocess_requests(void **ops, uint16_t nb_ops)
+{
+	struct rte_crypto_op *op;
+	struct qat_sym_session *ctx;
+	uint16_t i;
+
+	for (i = 0; i < nb_ops; i++) {
+		op = (struct rte_crypto_op *)ops[i];
+
+		if (op->sess_type == RTE_CRYPTO_OP_SECURITY_SESSION) {
+			ctx = (struct qat_sym_session *)
+				get_sec_session_private_data(
+					op->sym->sec_session);
+
+			if (ctx == NULL || ctx->bpi_ctx == NULL)
+				continue;
+
+			qat_crc_generate(ctx, op);
+		}
+	}
+}
+#else
+
+static inline void
+qat_sym_preprocess_requests(void **ops __rte_unused,
+				uint16_t nb_ops __rte_unused)
+{
+}
 #endif
 
 static inline void
@@ -215,6 +266,12 @@ qat_sym_process_response(void **op, uint8_t *resp)
 }
 #else
 
+static inline void
+qat_sym_preprocess_requests(void **ops __rte_unused,
+				uint16_t nb_ops __rte_unused)
+{
+}
+
 static inline void
 qat_sym_process_response(void **op __rte_unused, uint8_t *resp __rte_unused)
 {
-- 
2.17.1