[PATCH 15/15] net/dpaa: fix buffer free in slow path

[Gagandeep Singh]

Adding a check in slow path to free those buffers
which are not external.

Fixes: 9124e65dd3eb ("net/dpaa: enable Tx queue taildrop")
Cc: stable at dpdk.org

Signed-off-by: Gagandeep Singh <g.singh at nxp.com>
---
 drivers/net/dpaa/dpaa_rxtx.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/net/dpaa/dpaa_rxtx.c b/drivers/net/dpaa/dpaa_rxtx.c
index 4d285b4f38..ce4f3d6c85 100644
--- a/drivers/net/dpaa/dpaa_rxtx.c
+++ b/drivers/net/dpaa/dpaa_rxtx.c
@@ -455,7 +455,7 @@ dpaa_free_mbuf(const struct qm_fd *fd)
 	bp_info = DPAA_BPID_TO_POOL_INFO(fd->bpid);
 	format = (fd->opaque & DPAA_FD_FORMAT_MASK) >> DPAA_FD_FORMAT_SHIFT;
 	if (unlikely(format == qm_fd_sg)) {
-		struct rte_mbuf *first_seg, *prev_seg, *cur_seg, *temp;
+		struct rte_mbuf *first_seg, *cur_seg;
 		struct qm_sg_entry *sgt, *sg_temp;
 		void *vaddr, *sg_vaddr;
 		int i = 0;
@@ -469,32 +469,25 @@ dpaa_free_mbuf(const struct qm_fd *fd)
 		sgt = vaddr + fd_offset;
 		sg_temp = &sgt[i++];
 		hw_sg_to_cpu(sg_temp);
-		temp = (struct rte_mbuf *)
-			((char *)vaddr - bp_info->meta_data_size);
 		sg_vaddr = DPAA_MEMPOOL_PTOV(bp_info,
 						qm_sg_entry_get64(sg_temp));
-
 		first_seg = (struct rte_mbuf *)((char *)sg_vaddr -
 						bp_info->meta_data_size);
 		first_seg->nb_segs = 1;
-		prev_seg = first_seg;
 		while (i < DPAA_SGT_MAX_ENTRIES) {
 			sg_temp = &sgt[i++];
 			hw_sg_to_cpu(sg_temp);
-			sg_vaddr = DPAA_MEMPOOL_PTOV(bp_info,
+			if (sg_temp->bpid != 0xFF) {
+				bp_info = DPAA_BPID_TO_POOL_INFO(sg_temp->bpid);
+				sg_vaddr = DPAA_MEMPOOL_PTOV(bp_info,
 						qm_sg_entry_get64(sg_temp));
-			cur_seg = (struct rte_mbuf *)((char *)sg_vaddr -
+				cur_seg = (struct rte_mbuf *)((char *)sg_vaddr -
 						      bp_info->meta_data_size);
-			first_seg->nb_segs += 1;
-			prev_seg->next = cur_seg;
-			if (sg_temp->final) {
-				cur_seg->next = NULL;
-				break;
+				rte_pktmbuf_free_seg(cur_seg);
 			}
-			prev_seg = cur_seg;
+			if (sg_temp->final)
+				break;
 		}
-
-		rte_pktmbuf_free_seg(temp);
 		rte_pktmbuf_free_seg(first_seg);
 		return 0;
 	}
-- 
2.25.1