[dpdk-dev] [PATCH] net/i40e: Improve i40evf buffer cleanup in tx vector mode

[Roger B Melton]

---

i40evf tx vector logic frees mbufs, but it does not remove the
mbufs from software rings which leads to double frees.  This change
 corrects that oversight.  We've validated this fix within our application.

 drivers/net/i40e/i40e_rxtx_vec_common.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h 
b/drivers/net/i40e/i40e_rxtx_vec_common.h
index 39a6da0..fdc6fce 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_common.h
+++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
@@ -127,6 +127,7 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
        if (likely(m != NULL)) {
                free[0] = m;
                nb_free = 1;
+               txep[0].mbuf = NULL;
                for (i = 1; i < n; i++) {
                        m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
                        if (likely(m != NULL)) {
@@ -139,14 +140,17 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
                                        free[0] = m;
                                        nb_free = 1;
                                }
+                               txep[i].mbuf = NULL;
                        }
                }
                rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
        } else {
+               txep[0].mbuf = NULL;
                for (i = 1; i < n; i++) {
                        m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
                        if (m != NULL)
                                rte_mempool_put(m->pool, m);
+                       txep[i].mbuf = NULL;
                }
        }
 
-- 
2.10.3.dirty