Re: [PATCH RFC v2 virtio 5/7] pds_vdpa: add support for vdpa and vdpamgmt interfaces

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On Thu, Mar 9, 2023 at 9:31 AM Shannon Nelson <shannon.nelson@xxxxxxx> wrote:
>
> 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@xxxxxxx>
> ---
>  drivers/vdpa/pds/aux_drv.c  |  15 +
>  drivers/vdpa/pds/aux_drv.h  |   1 +
>  drivers/vdpa/pds/debugfs.c  | 172 ++++++++++++
>  drivers/vdpa/pds/debugfs.h  |   8 +
>  drivers/vdpa/pds/vdpa_dev.c | 545 +++++++++++++++++++++++++++++++++++-
>  5 files changed, 740 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
> index 28158d0d98a5..d706f06f7400 100644
> --- a/drivers/vdpa/pds/aux_drv.c
> +++ b/drivers/vdpa/pds/aux_drv.c
> @@ -60,8 +60,21 @@ 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:
> +       pds_vdpa_remove_virtio(&vdpa_aux->vd_mdev);
>  err_free_mgmt_info:
>         pci_free_irq_vectors(padev->vf->pdev);
>  err_aux_unreg:
> @@ -78,11 +91,13 @@ 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);
>         pds_vdpa_remove_virtio(&vdpa_aux->vd_mdev);
>         pci_free_irq_vectors(vdpa_aux->padev->vf->pdev);
>
>         vdpa_aux->padev->ops->unregister_client(vdpa_aux->padev);
>
> +       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 87ac3c01c476..1ab1ce64da7c 100644
> --- a/drivers/vdpa/pds/aux_drv.h
> +++ b/drivers/vdpa/pds/aux_drv.h
> @@ -11,6 +11,7 @@ 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 aa5e9677fe74..b3ee4f42f3b6 100644
> --- a/drivers/vdpa/pds/debugfs.c
> +++ b/drivers/vdpa/pds/debugfs.c
> @@ -9,6 +9,7 @@
>  #include <linux/pds/pds_auxbus.h>
>
>  #include "aux_drv.h"
> +#include "vdpa_dev.h"
>  #include "debugfs.h"
>
>  #ifdef CONFIG_DEBUG_FS
> @@ -26,4 +27,175 @@ void pds_vdpa_debugfs_destroy(void)
>         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, u16 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");
> +}
> +
> +#define PRINT_FBIT_NAME(__seq, __f, __name)                \
> +       do {                                               \
> +               if ((__f) & BIT_ULL(__name))                 \
> +                       seq_printf(__seq, " %s", #__name); \
> +       } while (0)
> +
> +static void print_feature_bits(struct seq_file *seq, u64 features)
> +{
> +       seq_puts(seq, "features:");
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CSUM);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_CSUM);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_MTU);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_MAC);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_TSO4);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_TSO6);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_ECN);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_UFO);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_HOST_TSO4);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_HOST_TSO6);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_HOST_ECN);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_HOST_UFO);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_MRG_RXBUF);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_STATUS);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_VQ);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_RX);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_VLAN);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_RX_EXTRA);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_GUEST_ANNOUNCE);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_MQ);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_CTRL_MAC_ADDR);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_HASH_REPORT);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_RSS);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_RSC_EXT);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_STANDBY);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_NET_F_SPEED_DUPLEX);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_NOTIFY_ON_EMPTY);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_ANY_LAYOUT);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_VERSION_1);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_ACCESS_PLATFORM);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_RING_PACKED);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_ORDER_PLATFORM);
> +       PRINT_FBIT_NAME(seq, features, VIRTIO_F_SR_IOV);
> +       seq_puts(seq, "\n");

Should we print the features that are not understood here?

> +}
> +
> +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(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;
> +
> +       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));
> +       print_status_bits(seq, __virtio16_to_cpu(true, vc.status));
> +
> +       seq_printf(seq, "req_features:         %#llx\n", pdsv->req_features);
> +       print_feature_bits(seq, pdsv->req_features);
> +       seq_printf(seq, "actual_features:      %#llx\n", pdsv->actual_features);
> +       print_feature_bits(seq, pdsv->actual_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);
> +
> +       seq_printf(seq, "hw_qtype:   %d\n", vq->hw_qtype);
> +       seq_printf(seq, "hw_qindex:  %d\n", vq->hw_qindex);
> +
> +       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;
> +}
>  #endif /* CONFIG_DEBUG_FS */
> diff --git a/drivers/vdpa/pds/debugfs.h b/drivers/vdpa/pds/debugfs.h
> index fff078a869e5..23e8345add0d 100644
> --- a/drivers/vdpa/pds/debugfs.h
> +++ b/drivers/vdpa/pds/debugfs.h
> @@ -10,9 +10,17 @@
>
>  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);
>  #else
>  static inline void pds_vdpa_debugfs_create(void) { }
>  static inline void pds_vdpa_debugfs_destroy(void) { }
> +static inline void pds_vdpa_debugfs_add_pcidev(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_add_ident(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_add_vdpadev(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_del_vdpadev(struct pds_vdpa_aux *vdpa_aux) { }
>  #endif
>
>  #endif /* _PDS_VDPA_DEBUGFS_H_ */
> diff --git a/drivers/vdpa/pds/vdpa_dev.c b/drivers/vdpa/pds/vdpa_dev.c
> index 15d623297203..2e0a5078d379 100644
> --- a/drivers/vdpa/pds/vdpa_dev.c
> +++ b/drivers/vdpa/pds/vdpa_dev.c
> @@ -5,6 +5,7 @@
>  #include <linux/vdpa.h>
>  #include <uapi/linux/vdpa.h>
>  #include <linux/virtio_pci_modern.h>
> +#include <uapi/linux/virtio_pci.h>
>
>  #include <linux/pds/pds_core.h>
>  #include <linux/pds/pds_adminq.h>
> @@ -13,7 +14,426 @@
>
>  #include "vdpa_dev.h"
>  #include "aux_drv.h"
> +#include "cmds.h"
> +#include "debugfs.h"
>
> +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;
> +       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;
> +
> +       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 */
> +               err = pds_vdpa_cmd_init_vq(pdsv, qid, &pdsv->vqs[qid]);
> +               if (err) {
> +                       pds_vdpa_release_irq(pdsv, qid);
> +                       ready = false;
> +               }
> +       } else {
> +               err = pds_vdpa_cmd_reset_vq(pdsv, 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;
> +       struct pds_vdpa_vq_set_state_cmd cmd = {
> +               .opcode = PDS_VDPA_CMD_VQ_SET_STATE,
> +               .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;
> +
> +       dev_dbg(dev, "%s: qid %d avail %#x\n",
> +               __func__, qid, state->packed.last_avail_idx);
> +
> +       if (pdsv->actual_features & VIRTIO_F_RING_PACKED) {
> +               cmd.avail = cpu_to_le16(state->packed.last_avail_idx |
> +                                       (state->packed.last_avail_counter << 15));
> +               cmd.used = cpu_to_le16(state->packed.last_used_idx |
> +                                      (state->packed.last_used_counter << 15));
> +       } else {
> +               cmd.avail = cpu_to_le16(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.
> +                */
> +               cmd.used = cpu_to_le16(state->split.avail_index);
> +       }
> +
> +       err = padev->ops->adminq_cmd(padev,
> +                                    (union pds_core_adminq_cmd *)&cmd,
> +                                    sizeof(cmd),
> +                                    (union pds_core_adminq_comp *)&comp,
> +                                    0);

I had one question for adminq command. I think we should use PF
instead of VF but in __pdsc_adminq_post() I saw:

        q_info->dest = comp;
        memcpy(q_info->desc, cmd, sizeof(*cmd));

So cmd should be fine since it is copied to the q_info->desc which is
already mapped. But q_info->dest look suspicious, where did it mapped?

Thanks


> +       if (err)
> +               dev_err(dev, "Failed to set vq state qid %u, status %d: %pe\n",
> +                       qid, comp.status, ERR_PTR(err));
> +
> +       return err;
> +}
> +
> +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;
> +       struct pds_vdpa_vq_get_state_cmd cmd = {
> +               .opcode = PDS_VDPA_CMD_VQ_GET_STATE,
> +               .vdpa_index = pdsv->vdpa_index,
> +               .vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
> +               .qid = cpu_to_le16(qid),
> +       };
> +       struct pds_vdpa_vq_get_state_comp comp = {0};
> +       int err;
> +
> +       dev_dbg(dev, "%s: qid %d\n", __func__, qid);
> +
> +       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 get vq state qid %u, status %d: %pe\n",
> +                       qid, comp.status, ERR_PTR(err));
> +               return err;
> +       }
> +
> +       if (pdsv->actual_features & VIRTIO_F_RING_PACKED) {
> +               state->packed.last_avail_idx = le16_to_cpu(comp.avail) & 0x7fff;
> +               state->packed.last_avail_counter = le16_to_cpu(comp.avail) >> 15;
> +       } else {
> +               state->split.avail_index = le16_to_cpu(comp.avail);
> +               /* state->split does not provide a used_index. */
> +       }
> +
> +       return err;
> +}
> +
> +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 = PAGE_SIZE;

Note that PAGE_SIZE varies among archs, I doubt we should use a fixed size here.

Others look good.

Thanks

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