netdev - [PATCH 2/7] vDPA/ifcvf: introduce new helpers to set config vector and vq vectors

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Date:   Mon, 10 Jan 2022 13:19:42 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH 2/7] vDPA/ifcvf: introduce new helpers to set config vector and vq vectors

This commit introduces new helpers to set config vector
and vq vectors in virtio common config space.

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vdpa/ifcvf/ifcvf_base.c | 30 ++++++++++++++++++++++++++++++
 drivers/vdpa/ifcvf/ifcvf_base.h |  2 ++
 2 files changed, 32 insertions(+)

diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index 0b5df4cfaf06..696a41560eaa 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -15,6 +15,36 @@ struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
 	return container_of(hw, struct ifcvf_adapter, vf);
 }
 
+int ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector)
+{
+	struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
+	struct ifcvf_adapter *ifcvf = vf_to_adapter(hw);
+
+	ifc_iowrite16(qid, &cfg->queue_select);
+	ifc_iowrite16(vector, &cfg->queue_msix_vector);
+	if (ifc_ioread16(&cfg->queue_msix_vector) == VIRTIO_MSI_NO_VECTOR) {
+		IFCVF_ERR(ifcvf->pdev, "No msix vector for queue %u\n", qid);
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+int ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector)
+{
+	struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
+	struct ifcvf_adapter *ifcvf = vf_to_adapter(hw);
+
+	cfg = hw->common_cfg;
+	ifc_iowrite16(vector,  &cfg->msix_config);
+	if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
+		IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
 				  struct virtio_pci_cap *cap)
 {
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
index c924a7673afb..1d5431040d7d 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.h
+++ b/drivers/vdpa/ifcvf/ifcvf_base.h
@@ -157,4 +157,6 @@ u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
 int ifcvf_probed_virtio_net(struct ifcvf_hw *hw);
+int ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector);
+int ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector);
 #endif /* _IFCVF_H_ */
-- 
2.27.0