netdev - [RFC 2/6] vDPA/ifcvf: support userspace to query features and MQ of a management device

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Message-Id: <20220513083935.1253031-3-lingshan.zhu@intel.com>
Date:   Fri, 13 May 2022 16:39:31 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [RFC 2/6] vDPA/ifcvf: support userspace to query features and MQ of a management device

Adapting to current netlink interfaces, this commit allows userspace
to query feature bits and MQ capability of a management device.

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vdpa/ifcvf/ifcvf_base.c | 12 ++++++++++++
 drivers/vdpa/ifcvf/ifcvf_base.h |  1 +
 drivers/vdpa/ifcvf/ifcvf_main.c |  3 +++
 3 files changed, 16 insertions(+)

diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index 6bccc8291c26..7be703b5d1f4 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -341,6 +341,18 @@ int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
 	return 0;
 }
 
+u16 ifcvf_get_max_vq_pairs(struct ifcvf_hw *hw)
+{
+	struct virtio_net_config __iomem *config;
+	u16 val, mq;
+
+	config  = (struct virtio_net_config __iomem *)hw->dev_cfg;
+	val = vp_ioread16((__le16 __iomem *)&config->max_virtqueue_pairs);
+	mq = le16_to_cpu((__force __le16)val);
+
+	return mq;
+}
+
 static int ifcvf_hw_enable(struct ifcvf_hw *hw)
 {
 	struct virtio_pci_common_cfg __iomem *cfg;
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
index f5563f665cc6..d54a1bed212e 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.h
+++ b/drivers/vdpa/ifcvf/ifcvf_base.h
@@ -130,6 +130,7 @@ u64 ifcvf_get_hw_features(struct ifcvf_hw *hw);
 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features);
 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
+u16 ifcvf_get_max_vq_pairs(struct ifcvf_hw *hw);
 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
 int ifcvf_probed_virtio_net(struct ifcvf_hw *hw);
 u32 ifcvf_get_config_size(struct ifcvf_hw *hw);
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 4366320fb68d..0c3af30b297e 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -786,6 +786,9 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	vf->hw_features = ifcvf_get_hw_features(vf);
 	vf->config_size = ifcvf_get_config_size(vf);
 
+	ifcvf_mgmt_dev->mdev.max_supported_vqs = ifcvf_get_max_vq_pairs(vf);
+	ifcvf_mgmt_dev->mdev.supported_features = vf->hw_features;
+
 	adapter->vdpa.mdev = &ifcvf_mgmt_dev->mdev;
 	ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
 	if (ret) {
-- 
2.31.1