net: hns3: fix interrupt clearing error for VF

Currently, VF driver has two kinds of interrupts, reset & CMDQ RX.
For revision 0x21, according to the UM, each interrupt should be
cleared by write 0 to the corresponding bit, but the implementation
writes 0 to the whole register in fact, it will clear other
interrupt at the same time, then the VF will loss the interrupt.
But for revision 0x20, this interrupt clear register is a read &
write register, for compatible, we just keep the old implementation
for 0x20.

This patch fixes it, also, adds a new register for reading the interrupt
status according to hardware user manual.

Fixes: e2cb1dec9779 ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support")
Fixes: b90fcc5bd904 ("net: hns3: add reset handling for VF when doing Core/Global/IMP reset")

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Reviewed-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index ce82b2b..d8b8281 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -1889,21 +1889,20 @@ static void hclgevf_clear_event_cause(struct hclgevf_dev *hdev, u32 regclr)
 static enum hclgevf_evt_cause hclgevf_check_evt_cause(struct hclgevf_dev *hdev,
                                                      u32 *clearval)
 {
-       u32 val, cmdq_src_reg, rst_ing_reg;
+       u32 val, cmdq_stat_reg, rst_ing_reg;
 
        /* fetch the events from their corresponding regs */
-       cmdq_src_reg = hclgevf_read_dev(&hdev->hw,
-                                       HCLGEVF_VECTOR0_CMDQ_SRC_REG);
+       cmdq_stat_reg = hclgevf_read_dev(&hdev->hw,
+                                        HCLGEVF_VECTOR0_CMDQ_STAT_REG);
 
-       if (BIT(HCLGEVF_VECTOR0_RST_INT_B) & cmdq_src_reg) {
+       if (BIT(HCLGEVF_VECTOR0_RST_INT_B) & cmdq_stat_reg) {
                rst_ing_reg = hclgevf_read_dev(&hdev->hw, HCLGEVF_RST_ING);
                dev_info(&hdev->pdev->dev,
                         "receive reset interrupt 0x%x!\n", rst_ing_reg);
                set_bit(HNAE3_VF_RESET, &hdev->reset_pending);
                set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
                set_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state);
-               cmdq_src_reg &= ~BIT(HCLGEVF_VECTOR0_RST_INT_B);
-               *clearval = cmdq_src_reg;
+               *clearval = ~(1U << HCLGEVF_VECTOR0_RST_INT_B);
                hdev->rst_stats.vf_rst_cnt++;
                /* set up VF hardware reset status, its PF will clear
                 * this status when PF has initialized done.
@@ -1915,9 +1914,20 @@ static enum hclgevf_evt_cause hclgevf_check_evt_cause(struct hclgevf_dev *hdev,
        }
 
        /* check for vector0 mailbox(=CMDQ RX) event source */
-       if (BIT(HCLGEVF_VECTOR0_RX_CMDQ_INT_B) & cmdq_src_reg) {
-               cmdq_src_reg &= ~BIT(HCLGEVF_VECTOR0_RX_CMDQ_INT_B);
-               *clearval = cmdq_src_reg;
+       if (BIT(HCLGEVF_VECTOR0_RX_CMDQ_INT_B) & cmdq_stat_reg) {
+               /* for revision 0x21, clearing interrupt is writing bit 0
+                * to the clear register, writing bit 1 means to keep the
+                * old value.
+                * for revision 0x20, the clear register is a read & write
+                * register, so we should just write 0 to the bit we are
+                * handling, and keep other bits as cmdq_stat_reg.
+                */
+               if (hdev->pdev->revision >= 0x21)
+                       *clearval = ~(1U << HCLGEVF_VECTOR0_RX_CMDQ_INT_B);
+               else
+                       *clearval = cmdq_stat_reg &
+                                   ~BIT(HCLGEVF_VECTOR0_RX_CMDQ_INT_B);
+
                return HCLGEVF_VECTOR0_EVENT_MBX;
        }
 

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
index f0736b0..4ccf107 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
@@ -87,6 +87,8 @@
 
 /* Vector0 interrupt CMDQ event source register(RW) */
 #define HCLGEVF_VECTOR0_CMDQ_SRC_REG   0x27100
+/* Vector0 interrupt CMDQ event status register(RO) */
+#define HCLGEVF_VECTOR0_CMDQ_STAT_REG  0x27104
 /* CMDQ register bits for RX event(=MBX event) */
 #define HCLGEVF_VECTOR0_RX_CMDQ_INT_B  1
 /* RST register bits for RESET event */