be2net: Clear pending tx completions before destroying tx queue

Clear pending tx completions in be_close() (ndo.stop method) so that after
unregister_netdev() calls be_close(), all tx skbs are freed and there are
no more tx completions when txq is destroyed.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index d20235b..acce6a6 100644 (file)
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -1018,21 +1018,35 @@ static void be_rx_q_clean(struct be_adapter *adapter)
        BUG_ON(atomic_read(&rxq->used));
 }
 
-static void be_tx_q_clean(struct be_adapter *adapter)
+static void be_tx_compl_clean(struct be_adapter *adapter)
 {
-       struct sk_buff **sent_skbs = adapter->tx_obj.sent_skb_list;
-       struct sk_buff *sent_skb;
+       struct be_queue_info *tx_cq = &adapter->tx_obj.cq;
        struct be_queue_info *txq = &adapter->tx_obj.q;
-       u16 last_index;
-       bool dummy_wrb;
-
-       while (atomic_read(&txq->used)) {
-               sent_skb = sent_skbs[txq->tail];
-               last_index = txq->tail;
-               index_adv(&last_index,
-                       wrb_cnt_for_skb(sent_skb, &dummy_wrb) - 1, txq->len);
-               be_tx_compl_process(adapter, last_index);
-       }
+       struct be_eth_tx_compl *txcp;
+       u16 end_idx, cmpl = 0, timeo = 0;
+
+       /* Wait for a max of 200ms for all the tx-completions to arrive. */
+       do {
+               while ((txcp = be_tx_compl_get(tx_cq))) {
+                       end_idx = AMAP_GET_BITS(struct amap_eth_tx_compl,
+                                       wrb_index, txcp);
+                       be_tx_compl_process(adapter, end_idx);
+                       cmpl++;
+               }
+               if (cmpl) {
+                       be_cq_notify(adapter, tx_cq->id, false, cmpl);
+                       cmpl = 0;
+               }
+
+               if (atomic_read(&txq->used) == 0 || ++timeo > 200)
+                       break;
+
+               mdelay(1);
+       } while (true);
+
+       if (atomic_read(&txq->used))
+               dev_err(&adapter->pdev->dev, "%d pending tx-completions\n",
+                       atomic_read(&txq->used));
 }
 
 static void be_mcc_queues_destroy(struct be_adapter *adapter)
@@ -1091,13 +1105,8 @@ static void be_tx_queues_destroy(struct be_adapter *adapter)
        struct be_queue_info *q;
 
        q = &adapter->tx_obj.q;
-       if (q->created) {
+       if (q->created)
                be_cmd_q_destroy(adapter, q, QTYPE_TXQ);
-
-               /* No more tx completions can be rcvd now; clean up if there
-                * are any pending completions or pending tx requests */
-               be_tx_q_clean(adapter);
-       }
        be_queue_free(adapter, q);
 
        q = &adapter->tx_obj.cq;
@@ -1645,6 +1654,11 @@ static int be_close(struct net_device *netdev)
        napi_disable(&rx_eq->napi);
        napi_disable(&tx_eq->napi);
 
+       /* Wait for all pending tx completions to arrive so that
+        * all tx skbs are freed.
+        */
+       be_tx_compl_clean(adapter);
+
        return 0;
 }