[dpdk-dev] [PATCH] net/i40e: fix unexpected mbuf free in vPMD

[Qi Zhang]

The patch reset tx queue sw_ring's mbuf to NULL after it is free in
i40_tx_free_bufs, this prevent same mbuf be free again in
i40e_dev_tx_queue_release. This fix follow the same implemenation of
non-vPMD.

Fixes: b4669bb95038 ("i40e: add vector Tx")
Cc: sta...@dpdk.org

Signed-off-by: Qi Zhang <qi.z.zh...@intel.com>
---
 drivers/net/i40e/i40e_rxtx_vec_common.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h 
b/drivers/net/i40e/i40e_rxtx_vec_common.h
index 39a6da0..ed51b4d 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_common.h
+++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
@@ -124,11 +124,13 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
          */
        txep = &txq->sw_ring[txq->tx_next_dd - (n - 1)];
        m = rte_pktmbuf_prefree_seg(txep[0].mbuf);
+       txep[0].mbuf = NULL;
        if (likely(m != NULL)) {
                free[0] = m;
                nb_free = 1;
                for (i = 1; i < n; i++) {
                        m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
+                       txep[i].mbuf = NULL;
                        if (likely(m != NULL)) {
                                if (likely(m->pool == free[0]->pool)) {
                                        free[nb_free++] = m;
@@ -145,6 +147,7 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
        } else {
                for (i = 1; i < n; i++) {
                        m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
+                       txep[i].mbuf = NULL;
                        if (m != NULL)
                                rte_mempool_put(m->pool, m);
                }
-- 
2.9.5