[PATCH RFC v2 virtio 4/7] pds_vdpa: add vdpa config client commands

[Shannon Nelson <shannon.nelson@amd.com>]

These are the adminq commands that will be needed for
setting up and using the vDPA device.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
---
 drivers/vdpa/pds/Makefile    |   1 +
 drivers/vdpa/pds/cmds.c      | 207 +++++++++++++++++++++++++++++++++++
 drivers/vdpa/pds/cmds.h      |  16 +++
 drivers/vdpa/pds/vdpa_dev.h  |  36 +++++-
 include/linux/pds/pds_vdpa.h | 175 +++++++++++++++++++++++++++++
 5 files changed, 434 insertions(+), 1 deletion(-)
 create mode 100644 drivers/vdpa/pds/cmds.c
 create mode 100644 drivers/vdpa/pds/cmds.h

diff --git a/drivers/vdpa/pds/Makefile b/drivers/vdpa/pds/Makefile
index ca2efa8c6eb5..7211eba3d942 100644
--- a/drivers/vdpa/pds/Makefile
+++ b/drivers/vdpa/pds/Makefile
@@ -4,6 +4,7 @@
 obj-$(CONFIG_PDS_VDPA) := pds_vdpa.o
 
 pds_vdpa-y := aux_drv.o \
+	      cmds.o \
 	      virtio_pci.o \
 	      vdpa_dev.o
 
diff --git a/drivers/vdpa/pds/cmds.c b/drivers/vdpa/pds/cmds.c
new file mode 100644
index 000000000000..45410739107c
--- /dev/null
+++ b/drivers/vdpa/pds/cmds.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#include <linux/vdpa.h>
+#include <linux/virtio_pci_modern.h>
+
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+#include <linux/pds/pds_auxbus.h>
+#include <linux/pds/pds_vdpa.h>
+
+#include "vdpa_dev.h"
+#include "aux_drv.h"
+#include "cmds.h"
+
+int pds_vdpa_init_hw(struct pds_vdpa_device *pdsv)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_init_cmd init_cmd = {
+		.opcode = PDS_VDPA_CMD_INIT,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.len = cpu_to_le32(sizeof(struct virtio_net_config)),
+		.config_pa = 0,   /* we use the PCI space, not an alternate space */
+	};
+	struct pds_vdpa_comp init_comp = {0};
+	int err;
+
+	/* Initialize the vdpa/virtio device */
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&init_cmd,
+				     sizeof(init_cmd),
+				     (union pds_core_adminq_comp *)&init_comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to init hw, status %d: %pe\n",
+			init_comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_reset(struct pds_vdpa_device *pdsv)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_RESET,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+	};
+	struct pds_vdpa_comp comp = {0};
+	int err;
+
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to reset hw, status %d: %pe\n",
+			comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_mac(struct pds_vdpa_device *pdsv, u8 *mac)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_setattr_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_SET_ATTR,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.attr = PDS_VDPA_ATTR_MAC,
+	};
+	struct pds_vdpa_comp comp = {0};
+	int err;
+
+	ether_addr_copy(cmd.mac, mac);
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to set mac address %pM, status %d: %pe\n",
+			mac, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_max_vq_pairs(struct pds_vdpa_device *pdsv, u16 max_vqp)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_setattr_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_SET_ATTR,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.attr = PDS_VDPA_ATTR_MAX_VQ_PAIRS,
+		.max_vq_pairs = cpu_to_le16(max_vqp),
+	};
+	struct pds_vdpa_comp comp = {0};
+	int err;
+
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to set max vq pairs %u, status %d: %pe\n",
+			max_vqp, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_init_vq(struct pds_vdpa_device *pdsv, u16 qid,
+			 struct pds_vdpa_vq_info *vq_info)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_vq_init_comp comp = {0};
+	struct pds_vdpa_vq_init_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_VQ_INIT,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.qid = cpu_to_le16(qid),
+		.len = cpu_to_le16(ilog2(vq_info->q_len)),
+		.desc_addr = cpu_to_le64(vq_info->desc_addr),
+		.avail_addr = cpu_to_le64(vq_info->avail_addr),
+		.used_addr = cpu_to_le64(vq_info->used_addr),
+		.intr_index = cpu_to_le16(qid),
+	};
+	int err;
+
+	dev_dbg(dev, "%s: qid %d len %d desc_addr %#llx avail_addr %#llx used_addr %#llx\n",
+		__func__, qid, ilog2(vq_info->q_len),
+		vq_info->desc_addr, vq_info->avail_addr, vq_info->used_addr);
+
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err) {
+		dev_err(dev, "Failed to init vq %d, status %d: %pe\n",
+			qid, comp.status, ERR_PTR(err));
+		return err;
+	}
+
+	vq_info->hw_qtype = comp.hw_qtype;
+	vq_info->hw_qindex = le16_to_cpu(comp.hw_qindex);
+
+	return 0;
+}
+
+int pds_vdpa_cmd_reset_vq(struct pds_vdpa_device *pdsv, u16 qid)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_vq_reset_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_VQ_RESET,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.qid = cpu_to_le16(qid),
+	};
+	struct pds_vdpa_comp comp = {0};
+	int err;
+
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to reset vq %d, status %d: %pe\n",
+			qid, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_features(struct pds_vdpa_device *pdsv, u64 features)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	struct pds_vdpa_set_features_cmd cmd = {
+		.opcode = PDS_VDPA_CMD_SET_FEATURES,
+		.vdpa_index = pdsv->vdpa_index,
+		.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.features = cpu_to_le64(features),
+	};
+	struct pds_vdpa_comp comp = {0};
+	int err;
+
+	err = padev->ops->adminq_cmd(padev,
+				     (union pds_core_adminq_cmd *)&cmd,
+				     sizeof(cmd),
+				     (union pds_core_adminq_comp *)&comp,
+				     0);
+	if (err)
+		dev_err(dev, "Failed to set features %#llx, status %d: %pe\n",
+			features, comp.status, ERR_PTR(err));
+
+	return err;
+}
diff --git a/drivers/vdpa/pds/cmds.h b/drivers/vdpa/pds/cmds.h
new file mode 100644
index 000000000000..72e19f4efde6
--- /dev/null
+++ b/drivers/vdpa/pds/cmds.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#ifndef _VDPA_CMDS_H_
+#define _VDPA_CMDS_H_
+
+int pds_vdpa_init_hw(struct pds_vdpa_device *pdsv);
+
+int pds_vdpa_cmd_reset(struct pds_vdpa_device *pdsv);
+int pds_vdpa_cmd_set_mac(struct pds_vdpa_device *pdsv, u8 *mac);
+int pds_vdpa_cmd_set_max_vq_pairs(struct pds_vdpa_device *pdsv, u16 max_vqp);
+int pds_vdpa_cmd_init_vq(struct pds_vdpa_device *pdsv, u16 qid,
+			 struct pds_vdpa_vq_info *vq_info);
+int pds_vdpa_cmd_reset_vq(struct pds_vdpa_device *pdsv, u16 qid);
+int pds_vdpa_cmd_set_features(struct pds_vdpa_device *pdsv, u64 features);
+#endif /* _VDPA_CMDS_H_ */
diff --git a/drivers/vdpa/pds/vdpa_dev.h b/drivers/vdpa/pds/vdpa_dev.h
index 97fab833a0aa..33284ebe538c 100644
--- a/drivers/vdpa/pds/vdpa_dev.h
+++ b/drivers/vdpa/pds/vdpa_dev.h
@@ -4,11 +4,45 @@
 #ifndef _VDPA_DEV_H_
 #define _VDPA_DEV_H_
 
-#define PDS_VDPA_MAX_QUEUES	65
+#include <linux/pci.h>
+#include <linux/vdpa.h>
+
+struct pds_vdpa_vq_info {
+	bool ready;
+	u64 desc_addr;
+	u64 avail_addr;
+	u64 used_addr;
+	u32 q_len;
+	u16 qid;
+	int irq;
+	char irq_name[32];
+
+	void __iomem *notify;
+	dma_addr_t notify_pa;
+
+	u64 doorbell;
+	u16 avail_idx;
+	u16 used_idx;
+
+	u8 hw_qtype;
+	u16 hw_qindex;
 
+	struct vdpa_callback event_cb;
+	struct pds_vdpa_device *pdsv;
+};
+
+#define PDS_VDPA_MAX_QUEUES	65
+#define PDS_VDPA_MAX_QLEN	32768
 struct pds_vdpa_device {
 	struct vdpa_device vdpa_dev;
 	struct pds_vdpa_aux *vdpa_aux;
+
+	struct pds_vdpa_vq_info vqs[PDS_VDPA_MAX_QUEUES];
+	u64 req_features;		/* features requested by vdpa */
+	u64 actual_features;		/* features negotiated and in use */
+	u8 vdpa_index;			/* rsvd for future subdevice use */
+	u8 num_vqs;			/* num vqs in use */
+	struct vdpa_callback config_cb;
 };
 
 int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux);
diff --git a/include/linux/pds/pds_vdpa.h b/include/linux/pds/pds_vdpa.h
index 3f7c08551163..b6a4cb4d3c6b 100644
--- a/include/linux/pds/pds_vdpa.h
+++ b/include/linux/pds/pds_vdpa.h
@@ -101,4 +101,179 @@ struct pds_vdpa_ident_cmd {
 	__le32 len;
 	__le64 ident_pa;
 };
+
+/**
+ * struct pds_vdpa_status_cmd - STATUS_UPDATE command
+ * @opcode:	Opcode PDS_VDPA_CMD_STATUS_UPDATE
+ * @vdpa_index: Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @status:	new status bits
+ */
+struct pds_vdpa_status_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	u8     status;
+};
+
+/**
+ * enum pds_vdpa_attr - List of VDPA device attributes
+ * @PDS_VDPA_ATTR_MAC:          MAC address
+ * @PDS_VDPA_ATTR_MAX_VQ_PAIRS: Max virtqueue pairs
+ */
+enum pds_vdpa_attr {
+	PDS_VDPA_ATTR_MAC          = 1,
+	PDS_VDPA_ATTR_MAX_VQ_PAIRS = 2,
+};
+
+/**
+ * struct pds_vdpa_setattr_cmd - SET_ATTR command
+ * @opcode:		Opcode PDS_VDPA_CMD_SET_ATTR
+ * @vdpa_index:		Index for vdpa subdevice
+ * @vf_id:		VF id
+ * @attr:		attribute to be changed (enum pds_vdpa_attr)
+ * @pad:		Word boundary padding
+ * @mac:		new mac address to be assigned as vdpa device address
+ * @max_vq_pairs:	new limit of virtqueue pairs
+ */
+struct pds_vdpa_setattr_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	u8     attr;
+	u8     pad[3];
+	union {
+		u8 mac[6];
+		__le16 max_vq_pairs;
+	} __packed;
+};
+
+/**
+ * struct pds_vdpa_vq_init_cmd - queue init command
+ * @opcode: Opcode PDS_VDPA_CMD_VQ_INIT
+ * @vdpa_index:	Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @qid:	Queue id (bit0 clear = rx, bit0 set = tx, qid=N is ctrlq)
+ * @len:	log(2) of max descriptor count
+ * @desc_addr:	DMA address of descriptor area
+ * @avail_addr:	DMA address of available descriptors (aka driver area)
+ * @used_addr:	DMA address of used descriptors (aka device area)
+ * @intr_index:	interrupt index
+ */
+struct pds_vdpa_vq_init_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	__le16 qid;
+	__le16 len;
+	__le64 desc_addr;
+	__le64 avail_addr;
+	__le64 used_addr;
+	__le16 intr_index;
+};
+
+/**
+ * struct pds_vdpa_vq_init_comp - queue init completion
+ * @status:	Status of the command (enum pds_core_status_code)
+ * @hw_qtype:	HW queue type, used in doorbell selection
+ * @hw_qindex:	HW queue index, used in doorbell selection
+ * @rsvd:	Word boundary padding
+ * @color:	Color bit
+ */
+struct pds_vdpa_vq_init_comp {
+	u8     status;
+	u8     hw_qtype;
+	__le16 hw_qindex;
+	u8     rsvd[11];
+	u8     color;
+};
+
+/**
+ * struct pds_vdpa_vq_reset_cmd - queue reset command
+ * @opcode:	Opcode PDS_VDPA_CMD_VQ_RESET
+ * @vdpa_index:	Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @qid:	Queue id
+ */
+struct pds_vdpa_vq_reset_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	__le16 qid;
+};
+
+/**
+ * struct pds_vdpa_set_features_cmd - set hw features
+ * @opcode: Opcode PDS_VDPA_CMD_SET_FEATURES
+ * @vdpa_index:	Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @rsvd:       Word boundary padding
+ * @features:	Feature bit mask
+ */
+struct pds_vdpa_set_features_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	__le32 rsvd;
+	__le64 features;
+};
+
+/**
+ * struct pds_vdpa_vq_set_state_cmd - set vq state
+ * @opcode:	Opcode PDS_VDPA_CMD_VQ_SET_STATE
+ * @vdpa_index:	Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @qid:	Queue id
+ * @avail:	Device avail index.
+ * @used:	Device used index.
+ *
+ * If the virtqueue uses packed descriptor format, then the avail and used
+ * index must have a wrap count.  The bits should be arranged like the upper
+ * 16 bits in the device available notification data: 15 bit index, 1 bit wrap.
+ */
+struct pds_vdpa_vq_set_state_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	__le16 qid;
+	__le16 avail;
+	__le16 used;
+};
+
+/**
+ * struct pds_vdpa_vq_get_state_cmd - get vq state
+ * @opcode:	Opcode PDS_VDPA_CMD_VQ_GET_STATE
+ * @vdpa_index:	Index for vdpa subdevice
+ * @vf_id:	VF id
+ * @qid:	Queue id
+ */
+struct pds_vdpa_vq_get_state_cmd {
+	u8     opcode;
+	u8     vdpa_index;
+	__le16 vf_id;
+	__le16 qid;
+};
+
+/**
+ * struct pds_vdpa_vq_get_state_comp - get vq state completion
+ * @status:	Status of the command (enum pds_core_status_code)
+ * @rsvd0:      Word boundary padding
+ * @avail:	Device avail index.
+ * @used:	Device used index.
+ * @rsvd:       Word boundary padding
+ * @color:	Color bit
+ *
+ * If the virtqueue uses packed descriptor format, then the avail and used
+ * index will have a wrap count.  The bits will be arranged like the "next"
+ * part of device available notification data: 15 bit index, 1 bit wrap.
+ */
+struct pds_vdpa_vq_get_state_comp {
+	u8     status;
+	u8     rsvd0;
+	__le16 avail;
+	__le16 used;
+	u8     rsvd[9];
+	u8     color;
+};
+
 #endif /* _PDS_VDPA_IF_H_ */
-- 
2.17.1