6.6-stable review patch. If anyone has any objections, please let me know.
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From: Yonglong Liu liuyonglong@huawei.com
[ Upstream commit 8e6b9c6ea5a55045eed6526d8ee49e93192d1a58 ]
When a VF is passthrough to a VM, and the VM is killed, the reported interrupt may not been handled, it will remain, and won't be clear by the nic engine even with a flr or tqp reset. When the VM restart, the interrupt of the first vector may be dropped by the second enable_irq in vfio, see the issue below: https://gitlab.com/qemu-project/qemu/-/issues/2884#note_2423361621
We notice that the vfio has always behaved this way, and the interrupt is a residue of the nic engine, so we fix the problem by moving the vector enable process out of the enable_irq loop.
Fixes: 08a100689d4b ("net: hns3: re-organize vector handle") Signed-off-by: Yonglong Liu liuyonglong@huawei.com Signed-off-by: Jijie Shao shaojijie@huawei.com Link: https://patch.msgid.link/20250430093052.2400464-3-shaojijie@huawei.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/ethernet/hisilicon/hns3/hns3_enet.c | 82 +++++++++---------- 1 file changed, 39 insertions(+), 43 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index 801801e8803e9..0ed01f4d68061 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -473,20 +473,14 @@ static void hns3_mask_vector_irq(struct hns3_enet_tqp_vector *tqp_vector, writel(mask_en, tqp_vector->mask_addr); }
-static void hns3_vector_enable(struct hns3_enet_tqp_vector *tqp_vector) +static void hns3_irq_enable(struct hns3_enet_tqp_vector *tqp_vector) { napi_enable(&tqp_vector->napi); enable_irq(tqp_vector->vector_irq); - - /* enable vector */ - hns3_mask_vector_irq(tqp_vector, 1); }
-static void hns3_vector_disable(struct hns3_enet_tqp_vector *tqp_vector) +static void hns3_irq_disable(struct hns3_enet_tqp_vector *tqp_vector) { - /* disable vector */ - hns3_mask_vector_irq(tqp_vector, 0); - disable_irq(tqp_vector->vector_irq); napi_disable(&tqp_vector->napi); cancel_work_sync(&tqp_vector->rx_group.dim.work); @@ -707,11 +701,42 @@ static int hns3_set_rx_cpu_rmap(struct net_device *netdev) return 0; }
+static void hns3_enable_irqs_and_tqps(struct net_device *netdev) +{ + struct hns3_nic_priv *priv = netdev_priv(netdev); + struct hnae3_handle *h = priv->ae_handle; + u16 i; + + for (i = 0; i < priv->vector_num; i++) + hns3_irq_enable(&priv->tqp_vector[i]); + + for (i = 0; i < priv->vector_num; i++) + hns3_mask_vector_irq(&priv->tqp_vector[i], 1); + + for (i = 0; i < h->kinfo.num_tqps; i++) + hns3_tqp_enable(h->kinfo.tqp[i]); +} + +static void hns3_disable_irqs_and_tqps(struct net_device *netdev) +{ + struct hns3_nic_priv *priv = netdev_priv(netdev); + struct hnae3_handle *h = priv->ae_handle; + u16 i; + + for (i = 0; i < h->kinfo.num_tqps; i++) + hns3_tqp_disable(h->kinfo.tqp[i]); + + for (i = 0; i < priv->vector_num; i++) + hns3_mask_vector_irq(&priv->tqp_vector[i], 0); + + for (i = 0; i < priv->vector_num; i++) + hns3_irq_disable(&priv->tqp_vector[i]); +} + static int hns3_nic_net_up(struct net_device *netdev) { struct hns3_nic_priv *priv = netdev_priv(netdev); struct hnae3_handle *h = priv->ae_handle; - int i, j; int ret;
ret = hns3_nic_reset_all_ring(h); @@ -720,23 +745,13 @@ static int hns3_nic_net_up(struct net_device *netdev)
clear_bit(HNS3_NIC_STATE_DOWN, &priv->state);
- /* enable the vectors */ - for (i = 0; i < priv->vector_num; i++) - hns3_vector_enable(&priv->tqp_vector[i]); - - /* enable rcb */ - for (j = 0; j < h->kinfo.num_tqps; j++) - hns3_tqp_enable(h->kinfo.tqp[j]); + hns3_enable_irqs_and_tqps(netdev);
/* start the ae_dev */ ret = h->ae_algo->ops->start ? h->ae_algo->ops->start(h) : 0; if (ret) { set_bit(HNS3_NIC_STATE_DOWN, &priv->state); - while (j--) - hns3_tqp_disable(h->kinfo.tqp[j]); - - for (j = i - 1; j >= 0; j--) - hns3_vector_disable(&priv->tqp_vector[j]); + hns3_disable_irqs_and_tqps(netdev); }
return ret; @@ -823,17 +838,9 @@ static void hns3_reset_tx_queue(struct hnae3_handle *h) static void hns3_nic_net_down(struct net_device *netdev) { struct hns3_nic_priv *priv = netdev_priv(netdev); - struct hnae3_handle *h = hns3_get_handle(netdev); const struct hnae3_ae_ops *ops; - int i;
- /* disable vectors */ - for (i = 0; i < priv->vector_num; i++) - hns3_vector_disable(&priv->tqp_vector[i]); - - /* disable rcb */ - for (i = 0; i < h->kinfo.num_tqps; i++) - hns3_tqp_disable(h->kinfo.tqp[i]); + hns3_disable_irqs_and_tqps(netdev);
/* stop ae_dev */ ops = priv->ae_handle->ae_algo->ops; @@ -5870,8 +5877,6 @@ int hns3_set_channels(struct net_device *netdev, void hns3_external_lb_prepare(struct net_device *ndev, bool if_running) { struct hns3_nic_priv *priv = netdev_priv(ndev); - struct hnae3_handle *h = priv->ae_handle; - int i;
if (!if_running) return; @@ -5882,11 +5887,7 @@ void hns3_external_lb_prepare(struct net_device *ndev, bool if_running) netif_carrier_off(ndev); netif_tx_disable(ndev);
- for (i = 0; i < priv->vector_num; i++) - hns3_vector_disable(&priv->tqp_vector[i]); - - for (i = 0; i < h->kinfo.num_tqps; i++) - hns3_tqp_disable(h->kinfo.tqp[i]); + hns3_disable_irqs_and_tqps(ndev);
/* delay ring buffer clearing to hns3_reset_notify_uninit_enet * during reset process, because driver may not be able @@ -5902,7 +5903,6 @@ void hns3_external_lb_restore(struct net_device *ndev, bool if_running) { struct hns3_nic_priv *priv = netdev_priv(ndev); struct hnae3_handle *h = priv->ae_handle; - int i;
if (!if_running) return; @@ -5918,11 +5918,7 @@ void hns3_external_lb_restore(struct net_device *ndev, bool if_running)
clear_bit(HNS3_NIC_STATE_DOWN, &priv->state);
- for (i = 0; i < priv->vector_num; i++) - hns3_vector_enable(&priv->tqp_vector[i]); - - for (i = 0; i < h->kinfo.num_tqps; i++) - hns3_tqp_enable(h->kinfo.tqp[i]); + hns3_enable_irqs_and_tqps(ndev);
netif_tx_wake_all_queues(ndev);