[PATCH 7/8] net: thunderx: implement helpers to read mailbox IRQ status

[Vadim Lomovtsev]

This commit is to implement routines to read mailbox IRQ status
for particular VF at PF side, and for mailbox IRQ status
from PF at VF side.

Signed-off-by: Vadim Lomovtsev <vlomovtsev@xxxxxxxxxxx>
---
 drivers/net/ethernet/cavium/thunder/nic_main.c     | 13 +++++++++++++
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 14 ++++++++++++++
 drivers/net/ethernet/cavium/thunder/nicvf_queues.h |  1 +
 3 files changed, 28 insertions(+)

diff --git a/drivers/net/ethernet/cavium/thunder/nic_main.c b/drivers/net/ethernet/cavium/thunder/nic_main.c
index 620dbe082ca0..a32c1bd75794 100644
--- a/drivers/net/ethernet/cavium/thunder/nic_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nic_main.c
@@ -104,6 +104,19 @@ static u64 nic_reg_read(struct nicpf *nic, u64 offset)
 	return readq_relaxed(nic->reg_base + offset);
 }
 
+static int nic_is_mbox_intr_active(struct nicpf *nic, int vf_id)
+{
+	int ret = 0;
+
+	if (vf_id < NIC_VF_PER_MBX_REG) {
+		ret = nic_reg_read(nic, NIC_PF_MAILBOX_INT) & BIT_ULL(vf_id);
+	} else {
+		ret = nic_reg_read(nic, NIC_PF_MAILBOX_INT + sizeof(u64)) &
+			BIT_ULL(vf_id - NIC_VF_PER_MBX_REG);
+	}
+	return ret;
+}
+
 /* PF -> VF mailbox communication APIs */
 static void nic_enable_mbx_intr(struct nicpf *nic)
 {
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 5b4d3badcb73..e7ee7005657c 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -1801,6 +1801,20 @@ void nicvf_clear_intr(struct nicvf *nic, int int_type, int q_idx)
 	nicvf_reg_write(nic, NIC_VF_INT, mask);
 }
 
+/* Check if interrupt is active */
+int nicvf_check_is_intr_active(struct nicvf *nic, int int_type, int q_idx)
+{
+	u64 mask = nicvf_int_type_to_mask(int_type, q_idx);
+
+	if (!mask) {
+		netdev_dbg(nic->netdev,
+			   "Failed to read interrupt status: unknown type\n");
+		return 0;
+	}
+
+	return (mask & nicvf_reg_read(nic, NIC_VF_INT));
+}
+
 /* Check if interrupt is enabled */
 int nicvf_is_intr_enabled(struct nicvf *nic, int int_type, int q_idx)
 {
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
index 5e9a03cf1b4d..58f6fbe48bce 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
@@ -358,6 +358,7 @@ void nicvf_enable_intr(struct nicvf *nic, int int_type, int q_idx);
 void nicvf_disable_intr(struct nicvf *nic, int int_type, int q_idx);
 void nicvf_clear_intr(struct nicvf *nic, int int_type, int q_idx);
 int nicvf_is_intr_enabled(struct nicvf *nic, int int_type, int q_idx);
+int nicvf_check_is_intr_active(struct nicvf *nic, int int_type, int q_idx);
 
 /* Register access APIs */
 void nicvf_reg_write(struct nicvf *nic, u64 offset, u64 val);
-- 
2.17.2