[dpdk-dev] [PATCH 11/22] examples/ipsec-secgw: move IV to crypto op private data

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

Usually, IV will change for each crypto operation.
Therefore, instead of pointing at the same location,
IV is copied after each crypto operation.

This will let the IV to be passed as an offset from
the beginning of the crypto operation, instead of
a pointer.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 examples/ipsec-secgw/esp.c   | 27 ++++++++++++++++++---------
 examples/ipsec-secgw/ipsec.h |  2 +-
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/examples/ipsec-secgw/esp.c b/examples/ipsec-secgw/esp.c
index e77afa0..1504386 100644
--- a/examples/ipsec-secgw/esp.c
+++ b/examples/ipsec-secgw/esp.c
@@ -50,6 +50,9 @@
 #include "esp.h"
 #include "ipip.h"
 
+#define IV_OFFSET		(sizeof(struct rte_crypto_op) + \
+				sizeof(struct rte_crypto_sym_op))
+
 int
 esp_inbound(struct rte_mbuf *m, struct ipsec_sa *sa,
 		struct rte_crypto_op *cop)
@@ -93,13 +96,17 @@ esp_inbound(struct rte_mbuf *m, struct ipsec_sa *sa,
 	struct cnt_blk *icb;
 	uint8_t *aad;
 	uint8_t *iv = RTE_PTR_ADD(ip4, ip_hdr_len + sizeof(struct esp_hdr));
+	uint8_t *IV_ptr = rte_crypto_op_ctod_offset(cop,
+				uint8_t *, IV_OFFSET);
 
 	switch (sa->cipher_algo) {
 	case RTE_CRYPTO_CIPHER_NULL:
 	case RTE_CRYPTO_CIPHER_AES_CBC:
-		sym_cop->cipher.iv.data = iv;
-		sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m,
-				 ip_hdr_len + sizeof(struct esp_hdr));
+		/* Copy IV at the end of crypto operation */
+		rte_memcpy(IV_ptr, iv, sa->iv_len);
+		sym_cop->cipher.iv.data = IV_ptr;
+		sym_cop->cipher.iv.phys_addr =
+				rte_crypto_op_ctophys_offset(cop, IV_OFFSET);
 		sym_cop->cipher.iv.length = sa->iv_len;
 		break;
 	case RTE_CRYPTO_CIPHER_AES_CTR:
@@ -108,9 +115,9 @@ esp_inbound(struct rte_mbuf *m, struct ipsec_sa *sa,
 		icb->salt = sa->salt;
 		memcpy(&icb->iv, iv, 8);
 		icb->cnt = rte_cpu_to_be_32(1);
-		sym_cop->cipher.iv.data = (uint8_t *)icb;
-		sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m,
-			 (uint8_t *)icb - rte_pktmbuf_mtod(m, uint8_t *));
+		sym_cop->cipher.iv.data = IV_ptr;
+		sym_cop->cipher.iv.phys_addr =
+				rte_crypto_op_ctophys_offset(cop, IV_OFFSET);
 		sym_cop->cipher.iv.length = 16;
 		break;
 	default:
@@ -341,13 +348,15 @@ esp_outbound(struct rte_mbuf *m, struct ipsec_sa *sa,
 	padding[pad_len - 2] = pad_len - 2;
 	padding[pad_len - 1] = nlp;
 
+	uint8_t *IV_ptr = rte_crypto_op_ctod_offset(cop,
+				uint8_t *, IV_OFFSET);
 	struct cnt_blk *icb = get_cnt_blk(m);
 	icb->salt = sa->salt;
 	icb->iv = sa->seq;
 	icb->cnt = rte_cpu_to_be_32(1);
-	sym_cop->cipher.iv.data = (uint8_t *)icb;
-	sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m,
-			 (uint8_t *)icb - rte_pktmbuf_mtod(m, uint8_t *));
+	sym_cop->cipher.iv.data = IV_ptr;
+	sym_cop->cipher.iv.phys_addr =
+			rte_crypto_op_ctophys_offset(cop, IV_OFFSET);
 	sym_cop->cipher.iv.length = 16;
 
 	uint8_t *aad;
diff --git a/examples/ipsec-secgw/ipsec.h b/examples/ipsec-secgw/ipsec.h
index fe42661..de1df7b 100644
--- a/examples/ipsec-secgw/ipsec.h
+++ b/examples/ipsec-secgw/ipsec.h
@@ -118,10 +118,10 @@ struct ipsec_sa {
 } __rte_cache_aligned;
 
 struct ipsec_mbuf_metadata {
-	uint8_t buf[32];
 	struct ipsec_sa *sa;
 	struct rte_crypto_op cop;
 	struct rte_crypto_sym_op sym_cop;
+	uint8_t buf[32];
 } __rte_cache_aligned;
 
 struct cdev_qp {
-- 
2.9.4