[dpdk-dev] [PATCH 5/6] common/cpt: fix fill_sg_comp api for zero datalen

[Anoob Joseph <anoobj@marvell.com>]

From: Archana Muniganti <marchana@marvell.com>

fill_sg_comp_from_iov() prepares gather components for i/p IOV
buffers and extra buf. This API is failing to create a gather component
for extra_buf when IOV buf len is zero. Though there is enough space
to accommodate extra_buf, because of pre-decrementing of extra_buf
length from aggregate size, this issue is seen.

Fixes: b74652f3a91f ("common/cpt: add microcode interface for encryption")

Signed-off-by: Archana Muniganti <marchana@marvell.com>
Signed-off-by: Anoob Joseph <anoobj@marvell.com>
---
 drivers/common/cpt/cpt_ucode.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/common/cpt/cpt_ucode.h b/drivers/common/cpt/cpt_ucode.h
index 081249c..c310ea7 100644
--- a/drivers/common/cpt/cpt_ucode.h
+++ b/drivers/common/cpt/cpt_ucode.h
@@ -373,7 +373,7 @@ fill_sg_comp_from_iov(sg_comp_t *list,
 {
 	int32_t j;
 	uint32_t extra_len = extra_buf ? extra_buf->size : 0;
-	uint32_t size = *psize - extra_len;
+	uint32_t size = *psize;
 	buf_ptr_t *bufs;
 
 	bufs = from->bufs;
@@ -382,9 +382,6 @@ fill_sg_comp_from_iov(sg_comp_t *list,
 		uint32_t e_len;
 		sg_comp_t *to = &list[i >> 2];
 
-		if (!bufs[j].size)
-			continue;
-
 		if (unlikely(from_offset)) {
 			if (from_offset >= bufs[j].size) {
 				from_offset -= bufs[j].size;
@@ -416,18 +413,19 @@ fill_sg_comp_from_iov(sg_comp_t *list,
 				to->u.s.len[i % 4] = rte_cpu_to_be_16(e_len);
 			}
 
+			extra_len = RTE_MIN(extra_len, size);
 			/* Insert extra data ptr */
 			if (extra_len) {
 				i++;
 				to = &list[i >> 2];
 				to->u.s.len[i % 4] =
-					rte_cpu_to_be_16(extra_buf->size);
+					rte_cpu_to_be_16(extra_len);
 				to->ptr[i % 4] =
 					rte_cpu_to_be_64(extra_buf->dma_addr);
-
-				/* size already decremented by extra len */
+				size -= extra_len;
 			}
 
+			next_len = RTE_MIN(next_len, size);
 			/* insert the rest of the data */
 			if (next_len) {
 				i++;
-- 
2.7.4