net: hns3: bugfix for handling mailbox while the command queue reinitialized

BugLink: https://bugs.launchpad.net/bugs/1810457
In a multi-core machine, the mailbox service and reset service
will be executed at the same time. The reset service will re-initialize
the command queue, before that, the mailbox handler can only get some
invalid messages.

The HCLGE_STATE_CMD_DISABLE flag means that the command queue is not
available and needs to be reinitialized. Therefore, when the mailbox
handler recognizes this flag, it should not process the command.

Fixes: dde1a86e93ca ("net: hns3: Add mailbox support to PF driver")
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 3c88ed1d798da355859ca083d3884a16ce0841f2)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
index 04462a347a94075bd28453b6db9088d77ef586c9..f890022938d9a15a96e98ab2c48cea04fc0dc784 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -400,6 +400,12 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 
        /* handle all the mailbox requests in the queue */
        while (!hclge_cmd_crq_empty(&hdev->hw)) {
+               if (test_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state)) {
+                       dev_warn(&hdev->pdev->dev,
+                                "command queue needs re-initializing\n");
+                       return;
+               }
+
                desc = &crq->desc[crq->next_to_use];
                req = (struct hclge_mbx_vf_to_pf_cmd *)desc->data;