* [PATCH net-next] net-next/hinic: Fix a case of Tx Queue is Stopped forever
@ 2017-09-26 18:11 Aviad Krawczyk
2017-09-28 17:27 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Aviad Krawczyk @ 2017-09-26 18:11 UTC (permalink / raw)
To: davem; +Cc: linux-kernel, netdev, Aviad Krawczyk
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>
---
drivers/net/ethernet/huawei/hinic/hinic_tx.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
index abe3e38..9128858 100644
--- 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);
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net-next] net-next/hinic: Fix a case of Tx Queue is Stopped forever
2017-09-26 18:11 [PATCH net-next] net-next/hinic: Fix a case of Tx Queue is Stopped forever Aviad Krawczyk
@ 2017-09-28 17:27 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2017-09-28 17:27 UTC (permalink / raw)
To: aviad.krawczyk; +Cc: linux-kernel, netdev
From: Aviad Krawczyk <aviad.krawczyk@huawei.com>
Date: Wed, 27 Sep 2017 02:11:33 +0800
> 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>
Applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
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