From: Jijie Shao <shaojijie@huawei.com>
To: <yisen.zhuang@huawei.com>, <salil.mehta@huawei.com>,
<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <jiri@resnulli.us>
Cc: <shenjian15@huawei.com>, <wangjie125@huawei.com>,
<liuyonglong@huawei.com>, <shaojijie@huawei.com>,
<chenhao418@huawei.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH V2 net 4/7] net: hns3: use appropriate barrier function after setting a bit value
Date: Fri, 26 Apr 2024 18:00:42 +0800 [thread overview]
Message-ID: <20240426100045.1631295-5-shaojijie@huawei.com> (raw)
In-Reply-To: <20240426100045.1631295-1-shaojijie@huawei.com>
From: Peiyang Wang <wangpeiyang1@huawei.com>
There is a memory barrier in followed case. When set the port down,
hclgevf_set_timmer will set DOWN in state. Meanwhile, the service task has
different behaviour based on whether the state is DOWN. Thus, to make sure
service task see DOWN, use smp_mb__after_atomic after calling set_bit().
CPU0 CPU1
========================== ===================================
hclgevf_set_timer_task() hclgevf_periodic_service_task()
set_bit(DOWN,state) test_bit(DOWN,state)
pf also has this issue.
Fixes: ff200099d271 ("net: hns3: remove unnecessary work in hclgevf_main")
Fixes: 1c6dfe6fc6f7 ("net: hns3: remove mailbox and reset work in hclge_main")
Signed-off-by: Peiyang Wang <wangpeiyang1@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
---
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 3 +--
drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index a068cd745eb4..6eda73f1e6ad 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -7954,8 +7954,7 @@ static void hclge_set_timer_task(struct hnae3_handle *handle, bool enable)
/* Set the DOWN flag here to disable link updating */
set_bit(HCLGE_STATE_DOWN, &hdev->state);
- /* flush memory to make sure DOWN is seen by service task */
- smp_mb__before_atomic();
+ smp_mb__after_atomic(); /* flush memory to make sure DOWN is seen by service task */
hclge_flush_link_update(hdev);
}
}
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index b57111252d07..08db8e84be4e 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -2181,8 +2181,7 @@ static void hclgevf_set_timer_task(struct hnae3_handle *handle, bool enable)
} else {
set_bit(HCLGEVF_STATE_DOWN, &hdev->state);
- /* flush memory to make sure DOWN is seen by service task */
- smp_mb__before_atomic();
+ smp_mb__after_atomic(); /* flush memory to make sure DOWN is seen by service task */
hclgevf_flush_link_update(hdev);
}
}
--
2.30.0
next prev parent reply other threads:[~2024-04-26 10:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-26 10:00 [PATCH V2 net 0/7] There are some bugfix for the HNS3 ethernet driver Jijie Shao
2024-04-26 10:00 ` [PATCH V2 net 1/7] net: hns3: direct return when receive a unknown mailbox message Jijie Shao
2024-04-26 14:26 ` Simon Horman
2024-04-26 10:00 ` [PATCH V2 net 2/7] net: hns3: change type of numa_node_mask as nodemask_t Jijie Shao
2024-04-26 14:26 ` Simon Horman
2024-04-26 10:00 ` [PATCH V2 net 3/7] net: hns3: release PTP resources if pf initialization failed Jijie Shao
2024-04-26 11:21 ` Hariprasad Kelam
2024-04-26 10:00 ` Jijie Shao [this message]
2024-04-26 14:25 ` [PATCH V2 net 4/7] net: hns3: use appropriate barrier function after setting a bit value Simon Horman
2024-04-26 10:00 ` [PATCH V2 net 5/7] net: hns3: using user configure after hardware reset Jijie Shao
2024-04-26 14:25 ` Simon Horman
2024-04-28 14:14 ` Jijie Shao
2024-04-26 10:00 ` [PATCH V2 net 6/7] net: hns3: fix port vlan filter not disabled issue Jijie Shao
2024-04-26 18:15 ` Simon Horman
2024-04-26 10:00 ` [PATCH V2 net 7/7] net: hns3: fix kernel crash when devlink reload during initialization Jijie Shao
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