net: hns3: Fix for VF mailbox cannot receiving PF response
authorXi Wang <wangxi11@huawei.com>
Wed, 6 Jun 2018 13:07:51 +0000 (14:07 +0100)
committerDavid S. Miller <davem@davemloft.net>
Wed, 6 Jun 2018 18:02:48 +0000 (14:02 -0400)
commit1819e40908ee76c7219287224c22c772556c927e
tree850abbfd0caeb92ecfb355d1d4ec28fda8f8e899
parentdd612f18a49b63af8b3a5f572d999bdb197385bc
net: hns3: Fix for VF mailbox cannot receiving PF response

When the VF frequently switches the CMDQ interrupt, if the CMDQ_SRC is not
cleared, the VF will not receive the new PF response after the interrupt
is re-enabled, the corresponding log is as follows:

[  317.482222] hns3 0000:00:03.0: VF could not get mbx resp(=0) from PF
in 500 tries
[  317.483137] hns3 0000:00:03.0: VF request to get tqp info from PF
failed -5

This patch fixes this problem by clearing CMDQ_SRC before enabling
interrupt and syncing pending IRQ handlers after disabling interrupt.

Fixes: e2cb1dec9779 ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support")
Signed-off-by: Xi Wang <wangxi11@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c