From: Arek Kusztal <arkadiuszx.kusztal@intel.com>
Date: Tue, 29 Mar 2016 14:14:41 +0000 (+0100)
Subject: qat: add out-of-place symmetric operations
X-Git-Tag: spdx-start~7125
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=ceb1ccd5d50c1a89ba8bdd97cc199e7f07422b98

qat: add out-of-place symmetric operations

This patch adds out-of-place operations to qat symmetric crypto PMD,
i.e. the result of the operation can be written to the destination buffer
instead of overwriting the source buffer as done in "in-place" operation.
Both buffers can be of different sizes.
Previously the qat PMD assumed that m_src and m_dst in rte_crypto_sym_op
were identical.

Signed-off-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
Acked-by: John Griffin <john.griffin@intel.com>
---

diff --git a/doc/guides/cryptodevs/qat.rst b/doc/guides/cryptodevs/qat.rst
index af90b46d32..4b8f782a03 100644
--- a/doc/guides/cryptodevs/qat.rst
+++ b/doc/guides/cryptodevs/qat.rst
@@ -62,7 +62,6 @@ Limitations
 * Chained mbufs are not supported.
 * Hash only is not supported except Snow3G UIA2.
 * Cipher only is not supported except Snow3G UEA2.
-* Only in-place is currently supported (destination address is the same as source address).
 * Only supports the session-oriented API implementation (session-less APIs are not supported).
 * Not performance tuned.
 * Snow3g(UEA2) supported only if cipher length, cipher offset fields are byte-aligned.
diff --git a/drivers/crypto/qat/qat_crypto.c b/drivers/crypto/qat/qat_crypto.c
index 9001558e2f..45bb8b3718 100644
--- a/drivers/crypto/qat/qat_crypto.c
+++ b/drivers/crypto/qat/qat_crypto.c
@@ -692,17 +692,21 @@ qat_write_hw_desc_entry(struct rte_crypto_op *op, uint8_t *out_msg)
 	*qat_req = ctx->fw_req;
 	qat_req->comn_mid.opaque_data = (uint64_t)(uintptr_t)op;
 
-	/*
-	 * The following code assumes:
-	 * - single entry buffer.
-	 * - always in place.
-	 */
 	qat_req->comn_mid.dst_length =
-			qat_req->comn_mid.src_length =
-					rte_pktmbuf_data_len(op->sym->m_src);
+		qat_req->comn_mid.src_length =
+				rte_pktmbuf_data_len(op->sym->m_src);
+
 	qat_req->comn_mid.dest_data_addr =
-			qat_req->comn_mid.src_data_addr =
-					rte_pktmbuf_mtophys(op->sym->m_src);
+		qat_req->comn_mid.src_data_addr =
+			    rte_pktmbuf_mtophys(op->sym->m_src);
+
+	if (unlikely(op->sym->m_dst != NULL)) {
+		qat_req->comn_mid.dest_data_addr =
+				rte_pktmbuf_mtophys(op->sym->m_dst);
+		qat_req->comn_mid.dst_length =
+				rte_pktmbuf_data_len(op->sym->m_dst);
+	}
+
 	cipher_param = (void *)&qat_req->serv_specif_rqpars;
 	auth_param = (void *)((uint8_t *)cipher_param + sizeof(*cipher_param));