pds_vdpa: add support for vdpa and vdpamgmt interfaces

This is the vDPA device support, where we advertise that we can
support the virtio queues and deal with the configuration work
through the pds_core's adminq.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230519215632.12343-10-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

6 files changed, 892 insertions, 2 deletions

diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
index 0c4a135b14845..186e9ee22eb11 100644
--- a/drivers/vdpa/pds/aux_drv.c
+++ b/drivers/vdpa/pds/aux_drv.c
@@ -63,8 +63,21 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
 		goto err_free_mgmt_info;
 	}
 
+	/* Let vdpa know that we can provide devices */
+	err = vdpa_mgmtdev_register(&vdpa_aux->vdpa_mdev);
+	if (err) {
+		dev_err(dev, "%s: Failed to initialize vdpa_mgmt interface: %pe\n",
+			__func__, ERR_PTR(err));
+		goto err_free_virtio;
+	}
+
+	pds_vdpa_debugfs_add_pcidev(vdpa_aux);
+	pds_vdpa_debugfs_add_ident(vdpa_aux);
+
 	return 0;
 
+err_free_virtio:
+	vp_modern_remove(&vdpa_aux->vd_mdev);
 err_free_mgmt_info:
 	pci_free_irq_vectors(padev->vf_pdev);
 err_free_mem:
@@ -79,9 +92,11 @@ static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
 	struct pds_vdpa_aux *vdpa_aux = auxiliary_get_drvdata(aux_dev);
 	struct device *dev = &aux_dev->dev;
 
+	vdpa_mgmtdev_unregister(&vdpa_aux->vdpa_mdev);
 	vp_modern_remove(&vdpa_aux->vd_mdev);
 	pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
 
+	pds_vdpa_debugfs_del_vdpadev(vdpa_aux);
 	kfree(vdpa_aux);
 	auxiliary_set_drvdata(aux_dev, NULL);
 
diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
index 99e0ff340bfa4..26b75344156e4 100644
--- a/drivers/vdpa/pds/aux_drv.h
+++ b/drivers/vdpa/pds/aux_drv.h
@@ -13,6 +13,7 @@ struct pds_vdpa_aux {
 	struct pds_auxiliary_dev *padev;
 
 	struct vdpa_mgmt_dev vdpa_mdev;
+	struct pds_vdpa_device *pdsv;
 
 	struct pds_vdpa_ident ident;
 
diff --git a/drivers/vdpa/pds/debugfs.c b/drivers/vdpa/pds/debugfs.c
index d91dceb073803..21a0dc0cb607c 100644
--- a/drivers/vdpa/pds/debugfs.c
+++ b/drivers/vdpa/pds/debugfs.c
@@ -10,6 +10,7 @@
 #include <linux/pds/pds_auxbus.h>
 
 #include "aux_drv.h"
+#include "vdpa_dev.h"
 #include "debugfs.h"
 
 static struct dentry *dbfs_dir;
@@ -24,3 +25,265 @@ void pds_vdpa_debugfs_destroy(void)
 	debugfs_remove_recursive(dbfs_dir);
 	dbfs_dir = NULL;
 }
+
+#define PRINT_SBIT_NAME(__seq, __f, __name)                     \
+	do {                                                    \
+		if ((__f) & (__name))                               \
+			seq_printf(__seq, " %s", &#__name[16]); \
+	} while (0)
+
+static void print_status_bits(struct seq_file *seq, u8 status)
+{
+	seq_puts(seq, "status:");
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_ACKNOWLEDGE);
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_DRIVER);
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_DRIVER_OK);
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_FEATURES_OK);
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_NEEDS_RESET);
+	PRINT_SBIT_NAME(seq, status, VIRTIO_CONFIG_S_FAILED);
+	seq_puts(seq, "\n");
+}
+
+static void print_feature_bits_all(struct seq_file *seq, u64 features)
+{
+	int i;
+
+	seq_puts(seq, "features:");
+
+	for (i = 0; i < (sizeof(u64) * 8); i++) {
+		u64 mask = BIT_ULL(i);
+
+		switch (features & mask) {
+		case BIT_ULL(VIRTIO_NET_F_CSUM):
+			seq_puts(seq, " VIRTIO_NET_F_CSUM");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_CSUM):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_CSUM");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_GUEST_OFFLOADS");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_MTU):
+			seq_puts(seq, " VIRTIO_NET_F_MTU");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_MAC):
+			seq_puts(seq, " VIRTIO_NET_F_MAC");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_TSO4):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_TSO4");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_TSO6):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_TSO6");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_ECN):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_ECN");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_UFO):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_UFO");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_HOST_TSO4):
+			seq_puts(seq, " VIRTIO_NET_F_HOST_TSO4");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_HOST_TSO6):
+			seq_puts(seq, " VIRTIO_NET_F_HOST_TSO6");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_HOST_ECN):
+			seq_puts(seq, " VIRTIO_NET_F_HOST_ECN");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_HOST_UFO):
+			seq_puts(seq, " VIRTIO_NET_F_HOST_UFO");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_MRG_RXBUF):
+			seq_puts(seq, " VIRTIO_NET_F_MRG_RXBUF");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_STATUS):
+			seq_puts(seq, " VIRTIO_NET_F_STATUS");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_VQ):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_VQ");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_RX):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_RX");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_VLAN):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_VLAN");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_RX_EXTRA):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_RX_EXTRA");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_GUEST_ANNOUNCE):
+			seq_puts(seq, " VIRTIO_NET_F_GUEST_ANNOUNCE");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_MQ):
+			seq_puts(seq, " VIRTIO_NET_F_MQ");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR):
+			seq_puts(seq, " VIRTIO_NET_F_CTRL_MAC_ADDR");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_HASH_REPORT):
+			seq_puts(seq, " VIRTIO_NET_F_HASH_REPORT");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_RSS):
+			seq_puts(seq, " VIRTIO_NET_F_RSS");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_RSC_EXT):
+			seq_puts(seq, " VIRTIO_NET_F_RSC_EXT");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_STANDBY):
+			seq_puts(seq, " VIRTIO_NET_F_STANDBY");
+			break;
+		case BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX):
+			seq_puts(seq, " VIRTIO_NET_F_SPEED_DUPLEX");
+			break;
+		case BIT_ULL(VIRTIO_F_NOTIFY_ON_EMPTY):
+			seq_puts(seq, " VIRTIO_F_NOTIFY_ON_EMPTY");
+			break;
+		case BIT_ULL(VIRTIO_F_ANY_LAYOUT):
+			seq_puts(seq, " VIRTIO_F_ANY_LAYOUT");
+			break;
+		case BIT_ULL(VIRTIO_F_VERSION_1):
+			seq_puts(seq, " VIRTIO_F_VERSION_1");
+			break;
+		case BIT_ULL(VIRTIO_F_ACCESS_PLATFORM):
+			seq_puts(seq, " VIRTIO_F_ACCESS_PLATFORM");
+			break;
+		case BIT_ULL(VIRTIO_F_RING_PACKED):
+			seq_puts(seq, " VIRTIO_F_RING_PACKED");
+			break;
+		case BIT_ULL(VIRTIO_F_ORDER_PLATFORM):
+			seq_puts(seq, " VIRTIO_F_ORDER_PLATFORM");
+			break;
+		case BIT_ULL(VIRTIO_F_SR_IOV):
+			seq_puts(seq, " VIRTIO_F_SR_IOV");
+			break;
+		case 0:
+			break;
+		default:
+			seq_printf(seq, " bit_%d", i);
+			break;
+		}
+	}
+
+	seq_puts(seq, "\n");
+}
+
+void pds_vdpa_debugfs_add_pcidev(struct pds_vdpa_aux *vdpa_aux)
+{
+	vdpa_aux->dentry = debugfs_create_dir(pci_name(vdpa_aux->padev->vf_pdev), dbfs_dir);
+}
+
+static int identity_show(struct seq_file *seq, void *v)
+{
+	struct pds_vdpa_aux *vdpa_aux = seq->private;
+	struct vdpa_mgmt_dev *mgmt;
+
+	seq_printf(seq, "aux_dev:            %s\n",
+		   dev_name(&vdpa_aux->padev->aux_dev.dev));
+
+	mgmt = &vdpa_aux->vdpa_mdev;
+	seq_printf(seq, "max_vqs:            %d\n", mgmt->max_supported_vqs);
+	seq_printf(seq, "config_attr_mask:   %#llx\n", mgmt->config_attr_mask);
+	seq_printf(seq, "supported_features: %#llx\n", mgmt->supported_features);
+	print_feature_bits_all(seq, mgmt->supported_features);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(identity);
+
+void pds_vdpa_debugfs_add_ident(struct pds_vdpa_aux *vdpa_aux)
+{
+	debugfs_create_file("identity", 0400, vdpa_aux->dentry,
+			    vdpa_aux, &identity_fops);
+}
+
+static int config_show(struct seq_file *seq, void *v)
+{
+	struct pds_vdpa_device *pdsv = seq->private;
+	struct virtio_net_config vc;
+	u64 driver_features;
+	u8 status;
+
+	memcpy_fromio(&vc, pdsv->vdpa_aux->vd_mdev.device,
+		      sizeof(struct virtio_net_config));
+
+	seq_printf(seq, "mac:                  %pM\n", vc.mac);
+	seq_printf(seq, "max_virtqueue_pairs:  %d\n",
+		   __virtio16_to_cpu(true, vc.max_virtqueue_pairs));
+	seq_printf(seq, "mtu:                  %d\n", __virtio16_to_cpu(true, vc.mtu));
+	seq_printf(seq, "speed:                %d\n", le32_to_cpu(vc.speed));
+	seq_printf(seq, "duplex:               %d\n", vc.duplex);
+	seq_printf(seq, "rss_max_key_size:     %d\n", vc.rss_max_key_size);
+	seq_printf(seq, "rss_max_indirection_table_length: %d\n",
+		   le16_to_cpu(vc.rss_max_indirection_table_length));
+	seq_printf(seq, "supported_hash_types: %#x\n",
+		   le32_to_cpu(vc.supported_hash_types));
+	seq_printf(seq, "vn_status:            %#x\n",
+		   __virtio16_to_cpu(true, vc.status));
+
+	status = vp_modern_get_status(&pdsv->vdpa_aux->vd_mdev);
+	seq_printf(seq, "dev_status:           %#x\n", status);
+	print_status_bits(seq, status);
+
+	seq_printf(seq, "req_features:         %#llx\n", pdsv->req_features);
+	print_feature_bits_all(seq, pdsv->req_features);
+	driver_features = vp_modern_get_driver_features(&pdsv->vdpa_aux->vd_mdev);
+	seq_printf(seq, "driver_features:      %#llx\n", driver_features);
+	print_feature_bits_all(seq, driver_features);
+	seq_printf(seq, "vdpa_index:           %d\n", pdsv->vdpa_index);
+	seq_printf(seq, "num_vqs:              %d\n", pdsv->num_vqs);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(config);
+
+static int vq_show(struct seq_file *seq, void *v)
+{
+	struct pds_vdpa_vq_info *vq = seq->private;
+
+	seq_printf(seq, "ready:      %d\n", vq->ready);
+	seq_printf(seq, "desc_addr:  %#llx\n", vq->desc_addr);
+	seq_printf(seq, "avail_addr: %#llx\n", vq->avail_addr);
+	seq_printf(seq, "used_addr:  %#llx\n", vq->used_addr);
+	seq_printf(seq, "q_len:      %d\n", vq->q_len);
+	seq_printf(seq, "qid:        %d\n", vq->qid);
+
+	seq_printf(seq, "doorbell:   %#llx\n", vq->doorbell);
+	seq_printf(seq, "avail_idx:  %d\n", vq->avail_idx);
+	seq_printf(seq, "used_idx:   %d\n", vq->used_idx);
+	seq_printf(seq, "irq:        %d\n", vq->irq);
+	seq_printf(seq, "irq-name:   %s\n", vq->irq_name);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(vq);
+
+void pds_vdpa_debugfs_add_vdpadev(struct pds_vdpa_aux *vdpa_aux)
+{
+	int i;
+
+	debugfs_create_file("config", 0400, vdpa_aux->dentry, vdpa_aux->pdsv, &config_fops);
+
+	for (i = 0; i < vdpa_aux->pdsv->num_vqs; i++) {
+		char name[8];
+
+		snprintf(name, sizeof(name), "vq%02d", i);
+		debugfs_create_file(name, 0400, vdpa_aux->dentry,
+				    &vdpa_aux->pdsv->vqs[i], &vq_fops);
+	}
+}
+
+void pds_vdpa_debugfs_del_vdpadev(struct pds_vdpa_aux *vdpa_aux)
+{
+	debugfs_remove_recursive(vdpa_aux->dentry);
+	vdpa_aux->dentry = NULL;
+}
+
+void pds_vdpa_debugfs_reset_vdpadev(struct pds_vdpa_aux *vdpa_aux)
+{
+	/* we don't keep track of the entries, so remove it all
+	 * then rebuild the basics
+	 */
+	pds_vdpa_debugfs_del_vdpadev(vdpa_aux);
+	pds_vdpa_debugfs_add_pcidev(vdpa_aux);
+	pds_vdpa_debugfs_add_ident(vdpa_aux);
+}
diff --git a/drivers/vdpa/pds/debugfs.h b/drivers/vdpa/pds/debugfs.h
index 658849591a99d..c088a4e8f1e92 100644
--- a/drivers/vdpa/pds/debugfs.h
+++ b/drivers/vdpa/pds/debugfs.h
@@ -8,5 +8,10 @@
 
 void pds_vdpa_debugfs_create(void);
 void pds_vdpa_debugfs_destroy(void);
+void pds_vdpa_debugfs_add_pcidev(struct pds_vdpa_aux *vdpa_aux);
+void pds_vdpa_debugfs_add_ident(struct pds_vdpa_aux *vdpa_aux);
+void pds_vdpa_debugfs_add_vdpadev(struct pds_vdpa_aux *vdpa_aux);
+void pds_vdpa_debugfs_del_vdpadev(struct pds_vdpa_aux *vdpa_aux);
+void pds_vdpa_debugfs_reset_vdpadev(struct pds_vdpa_aux *vdpa_aux);
 
 #endif /* _PDS_VDPA_DEBUGFS_H_ */
diff --git a/drivers/vdpa/pds/vdpa_dev.c b/drivers/vdpa/pds/vdpa_dev.c
index 0f0f0ab8b8114..5690ee676ad9c 100644
--- a/drivers/vdpa/pds/vdpa_dev.c
+++ b/drivers/vdpa/pds/vdpa_dev.c
@@ -4,6 +4,7 @@
 #include <linux/pci.h>
 #include <linux/vdpa.h>
 #include <uapi/linux/vdpa.h>
+#include <linux/virtio_pci_modern.h>
 
 #include <linux/pds/pds_common.h>
 #include <linux/pds/pds_core_if.h>
@@ -12,7 +13,464 @@
 
 #include "vdpa_dev.h"
 #include "aux_drv.h"
+#include "cmds.h"
+#include "debugfs.h"
 
+static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev);
+
+static struct pds_vdpa_device *vdpa_to_pdsv(struct vdpa_device *vdpa_dev)
+{
+	return container_of(vdpa_dev, struct pds_vdpa_device, vdpa_dev);
+}
+
+static int pds_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
+				   u64 desc_addr, u64 driver_addr, u64 device_addr)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	pdsv->vqs[qid].desc_addr = desc_addr;
+	pdsv->vqs[qid].avail_addr = driver_addr;
+	pdsv->vqs[qid].used_addr = device_addr;
+
+	return 0;
+}
+
+static void pds_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid, u32 num)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	pdsv->vqs[qid].q_len = num;
+}
+
+static void pds_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	iowrite16(qid, pdsv->vqs[qid].notify);
+}
+
+static void pds_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
+			       struct vdpa_callback *cb)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	pdsv->vqs[qid].event_cb = *cb;
+}
+
+static irqreturn_t pds_vdpa_isr(int irq, void *data)
+{
+	struct pds_vdpa_vq_info *vq;
+
+	vq = data;
+	if (vq->event_cb.callback)
+		vq->event_cb.callback(vq->event_cb.private);
+
+	return IRQ_HANDLED;
+}
+
+static void pds_vdpa_release_irq(struct pds_vdpa_device *pdsv, int qid)
+{
+	if (pdsv->vqs[qid].irq == VIRTIO_MSI_NO_VECTOR)
+		return;
+
+	free_irq(pdsv->vqs[qid].irq, &pdsv->vqs[qid]);
+	pdsv->vqs[qid].irq = VIRTIO_MSI_NO_VECTOR;
+}
+
+static void pds_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev, u16 qid, bool ready)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct pci_dev *pdev = pdsv->vdpa_aux->padev->vf_pdev;
+	struct device *dev = &pdsv->vdpa_dev.dev;
+	u64 driver_features;
+	u16 invert_idx = 0;
+	int irq;
+	int err;
+
+	dev_dbg(dev, "%s: qid %d ready %d => %d\n",
+		__func__, qid, pdsv->vqs[qid].ready, ready);
+	if (ready == pdsv->vqs[qid].ready)
+		return;
+
+	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
+	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED))
+		invert_idx = PDS_VDPA_PACKED_INVERT_IDX;
+
+	if (ready) {
+		irq = pci_irq_vector(pdev, qid);
+		snprintf(pdsv->vqs[qid].irq_name, sizeof(pdsv->vqs[qid].irq_name),
+			 "vdpa-%s-%d", dev_name(dev), qid);
+
+		err = request_irq(irq, pds_vdpa_isr, 0,
+				  pdsv->vqs[qid].irq_name, &pdsv->vqs[qid]);
+		if (err) {
+			dev_err(dev, "%s: no irq for qid %d: %pe\n",
+				__func__, qid, ERR_PTR(err));
+			return;
+		}
+		pdsv->vqs[qid].irq = irq;
+
+		/* Pass vq setup info to DSC using adminq to gather up and
+		 * send all info at once so FW can do its full set up in
+		 * one easy operation
+		 */
+		err = pds_vdpa_cmd_init_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
+		if (err) {
+			dev_err(dev, "Failed to init vq %d: %pe\n",
+				qid, ERR_PTR(err));
+			pds_vdpa_release_irq(pdsv, qid);
+			ready = false;
+		}
+	} else {
+		err = pds_vdpa_cmd_reset_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
+		if (err)
+			dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
+				__func__, qid, ERR_PTR(err));
+		pds_vdpa_release_irq(pdsv, qid);
+	}
+
+	pdsv->vqs[qid].ready = ready;
+}
+
+static bool pds_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	return pdsv->vqs[qid].ready;
+}
+
+static int pds_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
+				 const struct vdpa_vq_state *state)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	u64 driver_features;
+	u16 avail;
+	u16 used;
+
+	if (pdsv->vqs[qid].ready) {
+		dev_err(dev, "Setting device position is denied while vq is enabled\n");
+		return -EINVAL;
+	}
+
+	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
+	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
+		avail = state->packed.last_avail_idx |
+			(state->packed.last_avail_counter << 15);
+		used = state->packed.last_used_idx |
+		       (state->packed.last_used_counter << 15);
+
+		/* The avail and used index are stored with the packed wrap
+		 * counter bit inverted.  This way, in case set_vq_state is
+		 * not called, the initial value can be set to zero prior to
+		 * feature negotiation, and it is good for both packed and
+		 * split vq.
+		 */
+		avail ^= PDS_VDPA_PACKED_INVERT_IDX;
+		used ^= PDS_VDPA_PACKED_INVERT_IDX;
+	} else {
+		avail = state->split.avail_index;
+		/* state->split does not provide a used_index:
+		 * the vq will be set to "empty" here, and the vq will read
+		 * the current used index the next time the vq is kicked.
+		 */
+		used = avail;
+	}
+
+	if (used != avail) {
+		dev_dbg(dev, "Setting used equal to avail, for interoperability\n");
+		used = avail;
+	}
+
+	pdsv->vqs[qid].avail_idx = avail;
+	pdsv->vqs[qid].used_idx = used;
+
+	return 0;
+}
+
+static int pds_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
+				 struct vdpa_vq_state *state)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	u64 driver_features;
+	u16 avail;
+	u16 used;
+
+	if (pdsv->vqs[qid].ready) {
+		dev_err(dev, "Getting device position is denied while vq is enabled\n");
+		return -EINVAL;
+	}
+
+	avail = pdsv->vqs[qid].avail_idx;
+	used = pdsv->vqs[qid].used_idx;
+
+	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
+	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
+		avail ^= PDS_VDPA_PACKED_INVERT_IDX;
+		used ^= PDS_VDPA_PACKED_INVERT_IDX;
+
+		state->packed.last_avail_idx = avail & 0x7fff;
+		state->packed.last_avail_counter = avail >> 15;
+		state->packed.last_used_idx = used & 0x7fff;
+		state->packed.last_used_counter = used >> 15;
+	} else {
+		state->split.avail_index = avail;
+		/* state->split does not provide a used_index. */
+	}
+
+	return 0;
+}
+
+static struct vdpa_notification_area
+pds_vdpa_get_vq_notification(struct vdpa_device *vdpa_dev, u16 qid)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct virtio_pci_modern_device *vd_mdev;
+	struct vdpa_notification_area area;
+
+	area.addr = pdsv->vqs[qid].notify_pa;
+
+	vd_mdev = &pdsv->vdpa_aux->vd_mdev;
+	if (!vd_mdev->notify_offset_multiplier)
+		area.size = PDS_PAGE_SIZE;
+	else
+		area.size = vd_mdev->notify_offset_multiplier;
+
+	return area;
+}
+
+static int pds_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev, u16 qid)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	return pdsv->vqs[qid].irq;
+}
+
+static u32 pds_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
+{
+	return PDS_PAGE_SIZE;
+}
+
+static u32 pds_vdpa_get_vq_group(struct vdpa_device *vdpa_dev, u16 idx)
+{
+	return 0;
+}
+
+static u64 pds_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	return pdsv->supported_features;
+}
+
+static int pds_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct device *dev = &pdsv->vdpa_dev.dev;
+	u64 driver_features;
+	u64 nego_features;
+	u64 missing;
+
+	if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
+		dev_err(dev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
+		return -EOPNOTSUPP;
+	}
+
+	pdsv->req_features = features;
+
+	/* Check for valid feature bits */
+	nego_features = features & le64_to_cpu(pdsv->vdpa_aux->ident.hw_features);
+	missing = pdsv->req_features & ~nego_features;
+	if (missing) {
+		dev_err(dev, "Can't support all requested features in %#llx, missing %#llx features\n",
+			pdsv->req_features, missing);
+		return -EOPNOTSUPP;
+	}
+
+	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
+	dev_dbg(dev, "%s: %#llx => %#llx\n",
+		__func__, driver_features, nego_features);
+
+	if (driver_features == nego_features)
+		return 0;
+
+	vp_modern_set_features(&pdsv->vdpa_aux->vd_mdev, nego_features);
+
+	return 0;
+}
+
+static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	return vp_modern_get_driver_features(&pdsv->vdpa_aux->vd_mdev);
+}
+
+static void pds_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
+				   struct vdpa_callback *cb)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	pdsv->config_cb.callback = cb->callback;
+	pdsv->config_cb.private = cb->private;
+}
+
+static u16 pds_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	/* qemu has assert() that vq_num_max <= VIRTQUEUE_MAX_SIZE (1024) */
+	return min_t(u16, 1024, BIT(le16_to_cpu(pdsv->vdpa_aux->ident.max_qlen)));
+}
+
+static u32 pds_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
+{
+	return VIRTIO_ID_NET;
+}
+
+static u32 pds_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
+{
+	return PCI_VENDOR_ID_PENSANDO;
+}
+
+static u8 pds_vdpa_get_status(struct vdpa_device *vdpa_dev)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+
+	return vp_modern_get_status(&pdsv->vdpa_aux->vd_mdev);
+}
+
+static void pds_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct device *dev = &pdsv->vdpa_dev.dev;
+	u8 old_status;
+	int i;
+
+	old_status = pds_vdpa_get_status(vdpa_dev);
+	dev_dbg(dev, "%s: old %#x new %#x\n", __func__, old_status, status);
+
+	pds_vdpa_cmd_set_status(pdsv, status);
+
+	/* Note: still working with FW on the need for this reset cmd */
+	if (status == 0) {
+		pds_vdpa_cmd_reset(pdsv);
+
+		for (i = 0; i < pdsv->num_vqs; i++) {
+			pdsv->vqs[i].avail_idx = 0;
+			pdsv->vqs[i].used_idx = 0;
+		}
+	}
+
+	if (status & ~old_status & VIRTIO_CONFIG_S_FEATURES_OK) {
+		for (i = 0; i < pdsv->num_vqs; i++) {
+			pdsv->vqs[i].notify =
+				vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
+							i, &pdsv->vqs[i].notify_pa);
+		}
+	}
+}
+
+static int pds_vdpa_reset(struct vdpa_device *vdpa_dev)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	struct device *dev;
+	int err = 0;
+	u8 status;
+	int i;
+
+	dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
+	status = pds_vdpa_get_status(vdpa_dev);
+
+	if (status == 0)
+		return 0;
+
+	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+		/* Reset the vqs */
+		for (i = 0; i < pdsv->num_vqs && !err; i++) {
+			err = pds_vdpa_cmd_reset_vq(pdsv, i, 0, &pdsv->vqs[i]);
+			if (err)
+				dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
+					__func__, i, ERR_PTR(err));
+			pds_vdpa_release_irq(pdsv, i);
+			memset(&pdsv->vqs[i], 0, sizeof(pdsv->vqs[0]));
+			pdsv->vqs[i].ready = false;
+		}
+	}
+
+	pds_vdpa_set_status(vdpa_dev, 0);
+
+	return 0;
+}
+
+static size_t pds_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
+{
+	return sizeof(struct virtio_net_config);
+}
+
+static void pds_vdpa_get_config(struct vdpa_device *vdpa_dev,
+				unsigned int offset,
+				void *buf, unsigned int len)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	void __iomem *device;
+
+	if (offset + len > sizeof(struct virtio_net_config)) {
+		WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
+		return;
+	}
+
+	device = pdsv->vdpa_aux->vd_mdev.device;
+	memcpy_fromio(buf, device + offset, len);
+}
+
+static void pds_vdpa_set_config(struct vdpa_device *vdpa_dev,
+				unsigned int offset, const void *buf,
+				unsigned int len)
+{
+	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
+	void __iomem *device;
+
+	if (offset + len > sizeof(struct virtio_net_config)) {
+		WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
+		return;
+	}
+
+	device = pdsv->vdpa_aux->vd_mdev.device;
+	memcpy_toio(device + offset, buf, len);
+}
+
+static const struct vdpa_config_ops pds_vdpa_ops = {
+	.set_vq_address		= pds_vdpa_set_vq_address,
+	.set_vq_num		= pds_vdpa_set_vq_num,
+	.kick_vq		= pds_vdpa_kick_vq,
+	.set_vq_cb		= pds_vdpa_set_vq_cb,
+	.set_vq_ready		= pds_vdpa_set_vq_ready,
+	.get_vq_ready		= pds_vdpa_get_vq_ready,
+	.set_vq_state		= pds_vdpa_set_vq_state,
+	.get_vq_state		= pds_vdpa_get_vq_state,
+	.get_vq_notification	= pds_vdpa_get_vq_notification,
+	.get_vq_irq		= pds_vdpa_get_vq_irq,
+	.get_vq_align		= pds_vdpa_get_vq_align,
+	.get_vq_group		= pds_vdpa_get_vq_group,
+
+	.get_device_features	= pds_vdpa_get_device_features,
+	.set_driver_features	= pds_vdpa_set_driver_features,
+	.get_driver_features	= pds_vdpa_get_driver_features,
+	.set_config_cb		= pds_vdpa_set_config_cb,
+	.get_vq_num_max		= pds_vdpa_get_vq_num_max,
+	.get_device_id		= pds_vdpa_get_device_id,
+	.get_vendor_id		= pds_vdpa_get_vendor_id,
+	.get_status		= pds_vdpa_get_status,
+	.set_status		= pds_vdpa_set_status,
+	.reset			= pds_vdpa_reset,
+	.get_config_size	= pds_vdpa_get_config_size,
+	.get_config		= pds_vdpa_get_config,
+	.set_config		= pds_vdpa_set_config,
+};
 static struct virtio_device_id pds_vdpa_id_table[] = {
 	{VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
 	{0},
@@ -21,12 +479,157 @@ static struct virtio_device_id pds_vdpa_id_table[] = {
 static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 			    const struct vdpa_dev_set_config *add_config)
 {
-	return -EOPNOTSUPP;
+	struct pds_vdpa_aux *vdpa_aux;
+	struct pds_vdpa_device *pdsv;
+	struct vdpa_mgmt_dev *mgmt;
+	u16 fw_max_vqs, vq_pairs;
+	struct device *dma_dev;
+	struct pci_dev *pdev;
+	struct device *dev;
+	u8 mac[ETH_ALEN];
+	int err;
+	int i;
+
+	vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
+	dev = &vdpa_aux->padev->aux_dev.dev;
+	mgmt = &vdpa_aux->vdpa_mdev;
+
+	if (vdpa_aux->pdsv) {
+		dev_warn(dev, "Multiple vDPA devices on a VF is not supported.\n");
+		return -EOPNOTSUPP;
+	}
+
+	pdsv = vdpa_alloc_device(struct pds_vdpa_device, vdpa_dev,
+				 dev, &pds_vdpa_ops, 1, 1, name, false);
+	if (IS_ERR(pdsv)) {
+		dev_err(dev, "Failed to allocate vDPA structure: %pe\n", pdsv);
+		return PTR_ERR(pdsv);
+	}
+
+	vdpa_aux->pdsv = pdsv;
+	pdsv->vdpa_aux = vdpa_aux;
+
+	pdev = vdpa_aux->padev->vf_pdev;
+	dma_dev = &pdev->dev;
+	pdsv->vdpa_dev.dma_dev = dma_dev;
+
+	pdsv->supported_features = mgmt->supported_features;
+
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
+		u64 unsupp_features =
+			add_config->device_features & ~mgmt->supported_features;
+
+		if (unsupp_features) {
+			dev_err(dev, "Unsupported features: %#llx\n", unsupp_features);
+			err = -EOPNOTSUPP;
+			goto err_unmap;
+		}
+
+		pdsv->supported_features = add_config->device_features;
+	}
+
+	err = pds_vdpa_cmd_reset(pdsv);
+	if (err) {
+		dev_err(dev, "Failed to reset hw: %pe\n", ERR_PTR(err));
+		goto err_unmap;
+	}
+
+	err = pds_vdpa_init_hw(pdsv);
+	if (err) {
+		dev_err(dev, "Failed to init hw: %pe\n", ERR_PTR(err));
+		goto err_unmap;
+	}
+
+	fw_max_vqs = le16_to_cpu(pdsv->vdpa_aux->ident.max_vqs);
+	vq_pairs = fw_max_vqs / 2;
+
+	/* Make sure we have the queues being requested */
+	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MAX_VQP))
+		vq_pairs = add_config->net.max_vq_pairs;
+
+	pdsv->num_vqs = 2 * vq_pairs;
+	if (pdsv->supported_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
+		pdsv->num_vqs++;
+
+	if (pdsv->num_vqs > fw_max_vqs) {
+		dev_err(dev, "%s: queue count requested %u greater than max %u\n",
+			__func__, pdsv->num_vqs, fw_max_vqs);
+		err = -ENOSPC;
+		goto err_unmap;
+	}
+
+	if (pdsv->num_vqs != fw_max_vqs) {
+		err = pds_vdpa_cmd_set_max_vq_pairs(pdsv, vq_pairs);
+		if (err) {
+			dev_err(dev, "Failed to set max_vq_pairs: %pe\n",
+				ERR_PTR(err));
+			goto err_unmap;
+		}
+	}
+
+	/* Set a mac, either from the user config if provided
+	 * or set a random mac if default is 00:..:00
+	 */
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
+		ether_addr_copy(mac, add_config->net.mac);
+		pds_vdpa_cmd_set_mac(pdsv, mac);
+	} else {
+		struct virtio_net_config __iomem *vc;
+
+		vc = pdsv->vdpa_aux->vd_mdev.device;
+		memcpy_fromio(mac, vc->mac, sizeof(mac));
+		if (is_zero_ether_addr(mac)) {
+			eth_random_addr(mac);
+			dev_info(dev, "setting random mac %pM\n", mac);
+			pds_vdpa_cmd_set_mac(pdsv, mac);
+		}
+	}
+
+	for (i = 0; i < pdsv->num_vqs; i++) {
+		pdsv->vqs[i].qid = i;
+		pdsv->vqs[i].pdsv = pdsv;
+		pdsv->vqs[i].irq = VIRTIO_MSI_NO_VECTOR;
+		pdsv->vqs[i].notify = vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
+							      i, &pdsv->vqs[i].notify_pa);
+	}
+
+	pdsv->vdpa_dev.mdev = &vdpa_aux->vdpa_mdev;
+
+	/* We use the _vdpa_register_device() call rather than the
+	 * vdpa_register_device() to avoid a deadlock because our
+	 * dev_add() is called with the vdpa_dev_lock already set
+	 * by vdpa_nl_cmd_dev_add_set_doit()
+	 */
+	err = _vdpa_register_device(&pdsv->vdpa_dev, pdsv->num_vqs);
+	if (err) {
+		dev_err(dev, "Failed to register to vDPA bus: %pe\n", ERR_PTR(err));
+		goto err_unmap;
+	}
+
+	pds_vdpa_debugfs_add_vdpadev(vdpa_aux);
+
+	return 0;
+
+err_unmap:
+	put_device(&pdsv->vdpa_dev.dev);
+	vdpa_aux->pdsv = NULL;
+	return err;
 }
 
 static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
 			     struct vdpa_device *vdpa_dev)
 {
+	struct pds_vdpa_aux *vdpa_aux;
+
+	vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
+	_vdpa_unregister_device(vdpa_dev);
+
+	pds_vdpa_cmd_reset(vdpa_aux->pdsv);
+	pds_vdpa_debugfs_reset_vdpadev(vdpa_aux);
+
+	vdpa_aux->pdsv = NULL;
+
+	dev_info(&vdpa_aux->padev->aux_dev.dev, "Removed vdpa device\n");
 }
 
 static const struct vdpa_mgmtdev_ops pds_vdpa_mgmt_dev_ops = {
@@ -94,6 +697,7 @@ int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux)
 	mgmt->supported_features = le64_to_cpu(vdpa_aux->ident.hw_features);
 	mgmt->config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
 	mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
+	mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 
 	err = pci_alloc_irq_vectors(pdev, vdpa_aux->nintrs, vdpa_aux->nintrs,
 				    PCI_IRQ_MSIX);
diff --git a/drivers/vdpa/pds/vdpa_dev.h b/drivers/vdpa/pds/vdpa_dev.h
index a21596f438c1d..25c1d192f0efb 100644
--- a/drivers/vdpa/pds/vdpa_dev.h
+++ b/drivers/vdpa/pds/vdpa_dev.h
@@ -35,12 +35,14 @@ struct pds_vdpa_device {
 	struct pds_vdpa_aux *vdpa_aux;
 
 	struct pds_vdpa_vq_info vqs[PDS_VDPA_MAX_QUEUES];
+	u64 supported_features;		/* specified device features */
 	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;
 };
 
+#define PDS_VDPA_PACKED_INVERT_IDX	0x8000
+
 int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux);
 #endif /* _VDPA_DEV_H_ */