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

[Alvaro Karsz]

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

Signed-off-by: Alvaro Karsz <alvaro.ka...@solid-run.com>
---
 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 54909549a00..7bbbbd08e6f 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
@@ -316,3 +317,8 @@ 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 daeb69d00ed..96830e58211 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 a4213e97cfc..6dbb95fe2b7 100644
--- a/drivers/vdpa/solidrun/snet_vdpa.h
+++ b/drivers/vdpa/solidrun/snet_vdpa.h
@@ -201,5 +201,6 @@ 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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