[PATCH v4 2/2] vdpa/snet: support the suspend vDPA callback

[Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>]

When suspend is called, the driver sends a suspend command to the DPU
through the control mechanism.

Signed-off-by: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
---
 drivers/vdpa/solidrun/snet_ctrl.c |  6 ++++++
 drivers/vdpa/solidrun/snet_main.c | 15 +++++++++++++++
 drivers/vdpa/solidrun/snet_vdpa.h |  1 +
 3 files changed, 22 insertions(+)

diff --git a/drivers/vdpa/solidrun/snet_ctrl.c b/drivers/vdpa/solidrun/snet_ctrl.c
index 10cde502f1a..3858738643b 100644
--- a/drivers/vdpa/solidrun/snet_ctrl.c
+++ b/drivers/vdpa/solidrun/snet_ctrl.c
@@ -15,6 +15,7 @@
 enum snet_ctrl_opcodes {
 	SNET_CTRL_OP_DESTROY = 1,
 	SNET_CTRL_OP_READ_VQ_STATE,
+	SNET_CTRL_OP_SUSPEND,
 };
 
 #define SNET_CTRL_TIMEOUT	        2000000
@@ -322,3 +323,8 @@ int snet_read_vq_state(struct snet *snet, u16 idx, struct vdpa_vq_state *state)
 	return snet_ctrl_read_from_dpu(snet, SNET_CTRL_OP_READ_VQ_STATE, idx, state,
 				       sizeof(*state));
 }
+
+int snet_suspend_dev(struct snet *snet)
+{
+	return snet_send_ctrl_msg(snet, SNET_CTRL_OP_SUSPEND, 0);
+}
diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c
index 86769f436b4..7359599e09e 100644
--- a/drivers/vdpa/solidrun/snet_main.c
+++ b/drivers/vdpa/solidrun/snet_main.c
@@ -483,6 +483,20 @@ static void snet_set_config(struct vdpa_device *vdev, unsigned int offset,
 		iowrite8(*buf_ptr++, cfg_ptr + i);
 }
 
+static int snet_suspend(struct vdpa_device *vdev)
+{
+	struct snet *snet = vdpa_to_snet(vdev);
+	int ret;
+
+	ret = snet_suspend_dev(snet);
+	if (ret)
+		SNET_ERR(snet->pdev, "SNET[%u] suspend failed, err: %d\n", snet->sid, ret);
+	else
+		SNET_DBG(snet->pdev, "Suspend SNET[%u] device\n", snet->sid);
+
+	return ret;
+}
+
 static const struct vdpa_config_ops snet_config_ops = {
 	.set_vq_address         = snet_set_vq_address,
 	.set_vq_num             = snet_set_vq_num,
@@ -508,6 +522,7 @@ static const struct vdpa_config_ops snet_config_ops = {
 	.set_status             = snet_set_status,
 	.get_config             = snet_get_config,
 	.set_config             = snet_set_config,
+	.suspend		= snet_suspend,
 };
 
 static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet)
diff --git a/drivers/vdpa/solidrun/snet_vdpa.h b/drivers/vdpa/solidrun/snet_vdpa.h
index 09ff676e7a2..3c78d4e7d48 100644
--- a/drivers/vdpa/solidrun/snet_vdpa.h
+++ b/drivers/vdpa/solidrun/snet_vdpa.h
@@ -203,5 +203,6 @@ void psnet_create_hwmon(struct pci_dev *pdev);
 void snet_ctrl_clear(struct snet *snet);
 int snet_destroy_dev(struct snet *snet);
 int snet_read_vq_state(struct snet *snet, u16 idx, struct vdpa_vq_state *state);
+int snet_suspend_dev(struct snet *snet);
 
 #endif //_SNET_VDPA_H_
-- 
2.34.1

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