[dpdk-stable] [PATCH 4/6] vhost/crypto: fix incorrect write back source

[Ferruh Yigit <ferruh.yigit@intel.com>]

From: Fan Zhang <roy.fan.zhang@intel.com>

This patch fixes vhost crypto library for the incorrect source and
destination buffer calculation in the copy mode.

Fixes: cd1e8f03abf0 ("vhost/crypto: fix packet copy in chaining mode")
Cc: stable@dpdk.org

Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
---
 lib/librte_vhost/vhost_crypto.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/librte_vhost/vhost_crypto.c b/lib/librte_vhost/vhost_crypto.c
index 494f49084b..f1cc32a9b2 100644
--- a/lib/librte_vhost/vhost_crypto.c
+++ b/lib/librte_vhost/vhost_crypto.c
@@ -749,14 +749,14 @@ prepare_write_back_data(struct vhost_crypto_data_req *vc_req,
 		wb_data->src = src + offset;
 		dlen = desc->len;
 		dst = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr,
-			&dlen, VHOST_ACCESS_RW) + offset;
+			&dlen, VHOST_ACCESS_RW);
 		if (unlikely(!dst || dlen != desc->len)) {
 			VC_LOG_ERR("Failed to map descriptor");
 			goto error_exit;
 		}
 
-		wb_data->dst = dst;
-		wb_data->len = RTE_MIN(desc->len - offset, write_back_len);
+		wb_data->dst = dst + offset;
+		wb_data->len = RTE_MIN(dlen - offset, write_back_len);
 		write_back_len -= wb_data->len;
 		src += offset + wb_data->len;
 		offset = 0;
@@ -801,7 +801,7 @@ prepare_write_back_data(struct vhost_crypto_data_req *vc_req,
 			goto error_exit;
 		}
 
-		wb_data->src = src;
+		wb_data->src = src + offset;
 		wb_data->dst = dst;
 		wb_data->len = RTE_MIN(desc->len - offset, write_back_len);
 		write_back_len -= wb_data->len;
-- 
2.26.2