net-next/hinic: Fix a case of Tx Queue is Stopped forever

Fix the following scenario:
1. tx_free_poll is running on cpu X
2. xmit function is running on cpu Y and fails to get sq wqe
3. tx_free_poll frees wqes on cpu X and checks the queue is not stopped
4. xmit function stops the queue after failed to get sq wqe
5. The queue is stopped forever

Signed-off-by: Aviad Krawczyk <aviad.krawczyk@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
index abe3e38..9128858 100644 (file)
--- a/drivers/net/ethernet/huawei/hinic/hinic_tx.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
@@ -212,10 +212,19 @@ netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 
        sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
        if (!sq_wqe) {
-               tx_unmap_skb(nic_dev, skb, txq->sges);
-
                netif_stop_subqueue(netdev, qp->q_id);
 
+               /* Check for the case free_tx_poll is called in another cpu
+                * and we stopped the subqueue after free_tx_poll check.
+                */
+               sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
+               if (sq_wqe) {
+                       netif_wake_subqueue(nic_dev->netdev, qp->q_id);
+                       goto process_sq_wqe;
+               }
+
+               tx_unmap_skb(nic_dev, skb, txq->sges);
+
                u64_stats_update_begin(&txq->txq_stats.syncp);
                txq->txq_stats.tx_busy++;
                u64_stats_update_end(&txq->txq_stats.syncp);
@@ -223,6 +232,7 @@ netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
                goto flush_skbs;
        }
 
+process_sq_wqe:
        hinic_sq_prepare_wqe(txq->sq, prod_idx, sq_wqe, txq->sges, nr_sges);
 
        hinic_sq_write_wqe(txq->sq, prod_idx, sq_wqe, skb, wqe_size);