In *ixgbe_tx_free_bufs*, after recycling some tx entries, one should set their mbuf pointers to NULL.
The first path is not correct, the txep->mbuf should be set to NULL no matter if it is recycled into mempool Signed-off-by: hepeng <xnhp0320 at icloud.com> --- drivers/net/ixgbe/ixgbe_rxtx_vec.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec.c b/drivers/net/ixgbe/ixgbe_rxtx_vec.c index 1c16dec..e7ce740 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx_vec.c +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec.c @@ -612,6 +612,7 @@ ixgbe_tx_free_bufs(struct ixgbe_tx_queue *txq) */ txep = &txq->sw_ring_v[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; @@ -632,11 +633,21 @@ ixgbe_tx_free_bufs(struct ixgbe_tx_queue *txq) } else { for (i = 1; i < n; i++) { m = __rte_pktmbuf_prefree_seg(txep[i].mbuf); - if (m != NULL) + if (m != NULL) { rte_mempool_put(m->pool, m); + } } } + /* + * No matter the mbufs have been put back to mempool or not, + * we should set the txep[i].mbuf to NULL + */ + + for( i = 1; i < n; i++) { + txep[i].mbuf = NULL; + } + /* buffers were freed, update counters */ txq->nb_tx_free = (uint16_t)(txq->nb_tx_free + txq->tx_rs_thresh); txq->tx_next_dd = (uint16_t)(txq->tx_next_dd + txq->tx_rs_thresh); -- 1.9.1