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| author | Aviad Krawczyk <aviad.krawczyk@huawei.com> | 2017-09-27 02:11:33 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-28 10:26:50 -0700 |
| commit | bbdc9e687fb3c2920961d7716f1c5519ff7bc595 (patch) | |
| tree | 8464c77d3c01a5b2988dd425057f3df53859a0a3 /drivers/net/ethernet/huawei/hinic | |
| parent | 352f58b0d9f26d283b10f4c9f21e8717141c1334 (diff) | |
| download | linux-bbdc9e687fb3c2920961d7716f1c5519ff7bc595.tar.gz linux-bbdc9e687fb3c2920961d7716f1c5519ff7bc595.tar.bz2 linux-bbdc9e687fb3c2920961d7716f1c5519ff7bc595.zip | |
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>
Diffstat (limited to 'drivers/net/ethernet/huawei/hinic')
| -rw-r--r-- | drivers/net/ethernet/huawei/hinic/hinic_tx.c | 14 |
1 files 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 abe3e38cd342..9128858479c4 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); |