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Message-ID: <3a3b63f5-66a9-47aa-ba0d-3bb99c928a60@amd.com>
Date: Mon, 13 Mar 2023 17:40:33 +0530
From: Gautam Dawar <gdawar@....com>
To: Jason Wang <jasowang@...hat.com>,
Gautam Dawar <gautam.dawar@....com>
Cc: linux-net-drivers@....com, Edward Cree <ecree.xilinx@...il.com>,
Martin Habets <habetsm.xilinx@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
eperezma@...hat.com, harpreet.anand@....com, tanuj.kamde@....com,
koushik.dutta@....com
Subject: Re: [PATCH net-next v2 09/14] sfc: implement device status related
vdpa config operations
On 3/10/23 10:35, Jason Wang wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Tue, Mar 7, 2023 at 7:38 PM Gautam Dawar <gautam.dawar@....com> wrote:
>> vDPA config opertions to handle get/set device status and device
>> reset have been implemented. Also .suspend config operation is
>> implemented to support Live Migration.
>>
>> Signed-off-by: Gautam Dawar <gautam.dawar@....com>
>> ---
>> drivers/net/ethernet/sfc/ef100_vdpa.c | 16 +-
>> drivers/net/ethernet/sfc/ef100_vdpa.h | 2 +
>> drivers/net/ethernet/sfc/ef100_vdpa_ops.c | 367 ++++++++++++++++++++--
>> 3 files changed, 355 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.c b/drivers/net/ethernet/sfc/ef100_vdpa.c
>> index c66e5aef69ea..4ba57827a6cd 100644
>> --- a/drivers/net/ethernet/sfc/ef100_vdpa.c
>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.c
>> @@ -68,9 +68,14 @@ static int vdpa_allocate_vis(struct efx_nic *efx, unsigned int *allocated_vis)
>>
>> static void ef100_vdpa_delete(struct efx_nic *efx)
>> {
>> + struct vdpa_device *vdpa_dev;
>> +
>> if (efx->vdpa_nic) {
>> + vdpa_dev = &efx->vdpa_nic->vdpa_dev;
>> + ef100_vdpa_reset(vdpa_dev);
>> +
>> /* replace with _vdpa_unregister_device later */
>> - put_device(&efx->vdpa_nic->vdpa_dev.dev);
>> + put_device(&vdpa_dev->dev);
>> }
>> efx_mcdi_free_vis(efx);
>> }
>> @@ -171,6 +176,15 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
>> }
>> }
>>
>> + rc = devm_add_action_or_reset(&efx->pci_dev->dev,
>> + ef100_vdpa_irq_vectors_free,
>> + efx->pci_dev);
>> + if (rc) {
>> + pci_err(efx->pci_dev,
>> + "Failed adding devres for freeing irq vectors\n");
>> + goto err_put_device;
>> + }
>> +
>> rc = get_net_config(vdpa_nic);
>> if (rc)
>> goto err_put_device;
>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
>> index 348ca8a7404b..58791402e454 100644
>> --- a/drivers/net/ethernet/sfc/ef100_vdpa.h
>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
>> @@ -149,6 +149,8 @@ int ef100_vdpa_register_mgmtdev(struct efx_nic *efx);
>> void ef100_vdpa_unregister_mgmtdev(struct efx_nic *efx);
>> void ef100_vdpa_irq_vectors_free(void *data);
>> int ef100_vdpa_init_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx);
>> +void ef100_vdpa_irq_vectors_free(void *data);
>> +int ef100_vdpa_reset(struct vdpa_device *vdev);
>>
>> static inline bool efx_vdpa_is_little_endian(struct ef100_vdpa_nic *vdpa_nic)
>> {
>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
>> index 0051c4c0e47c..95a2177f85a2 100644
>> --- a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
>> @@ -22,11 +22,6 @@ static struct ef100_vdpa_nic *get_vdpa_nic(struct vdpa_device *vdev)
>> return container_of(vdev, struct ef100_vdpa_nic, vdpa_dev);
>> }
>>
>> -void ef100_vdpa_irq_vectors_free(void *data)
>> -{
>> - pci_free_irq_vectors(data);
>> -}
>> -
>> static int create_vring_ctx(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> {
>> struct efx_vring_ctx *vring_ctx;
>> @@ -52,14 +47,6 @@ static void delete_vring_ctx(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> vdpa_nic->vring[idx].vring_ctx = NULL;
>> }
>>
>> -static void reset_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> -{
>> - vdpa_nic->vring[idx].vring_type = EF100_VDPA_VQ_NTYPES;
>> - vdpa_nic->vring[idx].vring_state = 0;
>> - vdpa_nic->vring[idx].last_avail_idx = 0;
>> - vdpa_nic->vring[idx].last_used_idx = 0;
>> -}
>> -
>> int ef100_vdpa_init_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> {
>> u32 offset;
>> @@ -103,6 +90,236 @@ static bool is_qid_invalid(struct ef100_vdpa_nic *vdpa_nic, u16 idx,
>> return false;
>> }
>>
>> +static void irq_vring_fini(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + struct ef100_vdpa_vring_info *vring = &vdpa_nic->vring[idx];
>> + struct pci_dev *pci_dev = vdpa_nic->efx->pci_dev;
>> +
>> + devm_free_irq(&pci_dev->dev, vring->irq, vring);
>> + vring->irq = -EINVAL;
>> +}
>> +
>> +static irqreturn_t vring_intr_handler(int irq, void *arg)
>> +{
>> + struct ef100_vdpa_vring_info *vring = arg;
>> +
>> + if (vring->cb.callback)
>> + return vring->cb.callback(vring->cb.private);
>> +
>> + return IRQ_NONE;
>> +}
>> +
>> +static int ef100_vdpa_irq_vectors_alloc(struct pci_dev *pci_dev, u16 nvqs)
>> +{
>> + int rc;
>> +
>> + rc = pci_alloc_irq_vectors(pci_dev, nvqs, nvqs, PCI_IRQ_MSIX);
>> + if (rc < 0)
>> + pci_err(pci_dev,
>> + "Failed to alloc %d IRQ vectors, err:%d\n", nvqs, rc);
>> + return rc;
>> +}
>> +
>> +void ef100_vdpa_irq_vectors_free(void *data)
>> +{
>> + pci_free_irq_vectors(data);
>> +}
>> +
>> +static int irq_vring_init(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + struct ef100_vdpa_vring_info *vring = &vdpa_nic->vring[idx];
>> + struct pci_dev *pci_dev = vdpa_nic->efx->pci_dev;
>> + int irq;
>> + int rc;
>> +
>> + snprintf(vring->msix_name, 256, "x_vdpa[%s]-%d\n",
>> + pci_name(pci_dev), idx);
>> + irq = pci_irq_vector(pci_dev, idx);
>> + rc = devm_request_irq(&pci_dev->dev, irq, vring_intr_handler, 0,
>> + vring->msix_name, vring);
>> + if (rc)
>> + pci_err(pci_dev,
>> + "devm_request_irq failed for vring %d, rc %d\n",
>> + idx, rc);
>> + else
>> + vring->irq = irq;
>> +
>> + return rc;
>> +}
>> +
>> +static int delete_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + struct efx_vring_dyn_cfg vring_dyn_cfg;
>> + int rc;
>> +
>> + if (!(vdpa_nic->vring[idx].vring_state & EF100_VRING_CREATED))
>> + return 0;
>> +
>> + rc = efx_vdpa_vring_destroy(vdpa_nic->vring[idx].vring_ctx,
>> + &vring_dyn_cfg);
>> + if (rc)
>> + dev_err(&vdpa_nic->vdpa_dev.dev,
>> + "%s: delete vring failed index:%u, err:%d\n",
>> + __func__, idx, rc);
>> + vdpa_nic->vring[idx].last_avail_idx = vring_dyn_cfg.avail_idx;
>> + vdpa_nic->vring[idx].last_used_idx = vring_dyn_cfg.used_idx;
>> + vdpa_nic->vring[idx].vring_state &= ~EF100_VRING_CREATED;
>> +
>> + irq_vring_fini(vdpa_nic, idx);
>> +
>> + return rc;
>> +}
>> +
>> +static void ef100_vdpa_kick_vq(struct vdpa_device *vdev, u16 idx)
>> +{
>> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> + u32 idx_val;
>> +
>> + if (is_qid_invalid(vdpa_nic, idx, __func__))
>> + return;
>> +
>> + if (!(vdpa_nic->vring[idx].vring_state & EF100_VRING_CREATED))
>> + return;
>> +
>> + idx_val = idx;
>> + _efx_writed(vdpa_nic->efx, cpu_to_le32(idx_val),
>> + vdpa_nic->vring[idx].doorbell_offset);
>> +}
>> +
>> +static bool can_create_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + if (vdpa_nic->vring[idx].vring_state == EF100_VRING_CONFIGURED &&
>> + vdpa_nic->status & VIRTIO_CONFIG_S_DRIVER_OK &&
>> + !(vdpa_nic->vring[idx].vring_state & EF100_VRING_CREATED))
>> + return true;
>> +
>> + return false;
>> +}
>> +
>> +static int create_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + struct efx_vring_dyn_cfg vring_dyn_cfg;
>> + struct efx_vring_cfg vring_cfg;
>> + int rc;
>> +
>> + rc = irq_vring_init(vdpa_nic, idx);
>> + if (rc) {
>> + dev_err(&vdpa_nic->vdpa_dev.dev,
>> + "%s: irq_vring_init failed. index:%u, err:%d\n",
>> + __func__, idx, rc);
>> + return rc;
>> + }
>> + vring_cfg.desc = vdpa_nic->vring[idx].desc;
>> + vring_cfg.avail = vdpa_nic->vring[idx].avail;
>> + vring_cfg.used = vdpa_nic->vring[idx].used;
>> + vring_cfg.size = vdpa_nic->vring[idx].size;
>> + vring_cfg.features = vdpa_nic->features;
>> + vring_cfg.msix_vector = idx;
>> + vring_dyn_cfg.avail_idx = vdpa_nic->vring[idx].last_avail_idx;
>> + vring_dyn_cfg.used_idx = vdpa_nic->vring[idx].last_used_idx;
>> +
>> + rc = efx_vdpa_vring_create(vdpa_nic->vring[idx].vring_ctx,
>> + &vring_cfg, &vring_dyn_cfg);
>> + if (rc) {
>> + dev_err(&vdpa_nic->vdpa_dev.dev,
>> + "%s: vring_create failed index:%u, err:%d\n",
>> + __func__, idx, rc);
>> + goto err_vring_create;
>> + }
>> + vdpa_nic->vring[idx].vring_state |= EF100_VRING_CREATED;
>> +
>> + /* A VQ kick allows the device to read the avail_idx, which will be
>> + * required at the destination after live migration.
>> + */
>> + ef100_vdpa_kick_vq(&vdpa_nic->vdpa_dev, idx);
>> +
>> + return 0;
>> +
>> +err_vring_create:
>> + irq_vring_fini(vdpa_nic, idx);
>> + return rc;
>> +}
>> +
>> +static void reset_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
>> +{
>> + delete_vring(vdpa_nic, idx);
>> + vdpa_nic->vring[idx].vring_type = EF100_VDPA_VQ_NTYPES;
>> + vdpa_nic->vring[idx].vring_state = 0;
>> + vdpa_nic->vring[idx].last_avail_idx = 0;
>> + vdpa_nic->vring[idx].last_used_idx = 0;
>> +}
>> +
>> +static void ef100_reset_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
>> +{
>> + int i;
>> +
>> + WARN_ON(!mutex_is_locked(&vdpa_nic->lock));
>> +
>> + if (!vdpa_nic->status)
>> + return;
>> +
>> + vdpa_nic->vdpa_state = EF100_VDPA_STATE_INITIALIZED;
>> + vdpa_nic->status = 0;
>> + vdpa_nic->features = 0;
>> + for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++)
>> + reset_vring(vdpa_nic, i);
>> + ef100_vdpa_irq_vectors_free(vdpa_nic->efx->pci_dev);
>> +}
>> +
>> +/* May be called under the rtnl lock */
>> +int ef100_vdpa_reset(struct vdpa_device *vdev)
>> +{
>> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> +
>> + /* vdpa device can be deleted anytime but the bar_config
>> + * could still be vdpa and hence efx->state would be STATE_VDPA.
>> + * Accordingly, ensure vdpa device exists before reset handling
>> + */
>> + if (!vdpa_nic)
>> + return -ENODEV;
>> +
>> + mutex_lock(&vdpa_nic->lock);
>> + ef100_reset_vdpa_device(vdpa_nic);
>> + mutex_unlock(&vdpa_nic->lock);
>> + return 0;
>> +}
>> +
>> +static int start_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
>> +{
>> + struct efx_nic *efx = vdpa_nic->efx;
>> + struct ef100_nic_data *nic_data;
>> + int i, j;
>> + int rc;
>> +
>> + nic_data = efx->nic_data;
>> + rc = ef100_vdpa_irq_vectors_alloc(efx->pci_dev,
>> + vdpa_nic->max_queue_pairs * 2);
>> + if (rc < 0) {
>> + pci_err(efx->pci_dev,
>> + "vDPA IRQ alloc failed for vf: %u err:%d\n",
>> + nic_data->vf_index, rc);
>> + return rc;
>> + }
>> +
>> + for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++) {
>> + if (can_create_vring(vdpa_nic, i)) {
>> + rc = create_vring(vdpa_nic, i);
>> + if (rc)
>> + goto clear_vring;
>> + }
>> + }
>> +
>> + vdpa_nic->vdpa_state = EF100_VDPA_STATE_STARTED;
> It looks to me that this duplicates with the DRIVER_OK status bit.
vdpa_state is set EF100_VDPA_STATE_STARTED during DRIVER_OK handling.
See my later response for its purpose.
>
>> + return 0;
>> +
>> +clear_vring:
>> + for (j = 0; j < i; j++)
>> + delete_vring(vdpa_nic, j);
>> +
>> + ef100_vdpa_irq_vectors_free(efx->pci_dev);
>> + return rc;
>> +}
>> +
>> static int ef100_vdpa_set_vq_address(struct vdpa_device *vdev,
>> u16 idx, u64 desc_area, u64 driver_area,
>> u64 device_area)
>> @@ -144,22 +361,6 @@ static void ef100_vdpa_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num)
>> mutex_unlock(&vdpa_nic->lock);
>> }
>>
>> -static void ef100_vdpa_kick_vq(struct vdpa_device *vdev, u16 idx)
>> -{
>> - struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> - u32 idx_val;
>> -
>> - if (is_qid_invalid(vdpa_nic, idx, __func__))
>> - return;
>> -
>> - if (!(vdpa_nic->vring[idx].vring_state & EF100_VRING_CREATED))
>> - return;
>> -
>> - idx_val = idx;
>> - _efx_writed(vdpa_nic->efx, cpu_to_le32(idx_val),
>> - vdpa_nic->vring[idx].doorbell_offset);
>> -}
>> -
>> static void ef100_vdpa_set_vq_cb(struct vdpa_device *vdev, u16 idx,
>> struct vdpa_callback *cb)
>> {
>> @@ -176,6 +377,7 @@ static void ef100_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx,
>> bool ready)
>> {
>> struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> + int rc;
>>
>> if (is_qid_invalid(vdpa_nic, idx, __func__))
>> return;
>> @@ -184,9 +386,21 @@ static void ef100_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx,
>> if (ready) {
>> vdpa_nic->vring[idx].vring_state |=
>> EF100_VRING_READY_CONFIGURED;
>> + if (vdpa_nic->vdpa_state == EF100_VDPA_STATE_STARTED &&
>> + can_create_vring(vdpa_nic, idx)) {
>> + rc = create_vring(vdpa_nic, idx);
>> + if (rc)
>> + /* Rollback ready configuration
>> + * So that the above layer driver
>> + * can make another attempt to set ready
>> + */
>> + vdpa_nic->vring[idx].vring_state &=
>> + ~EF100_VRING_READY_CONFIGURED;
>> + }
>> } else {
>> vdpa_nic->vring[idx].vring_state &=
>> ~EF100_VRING_READY_CONFIGURED;
>> + delete_vring(vdpa_nic, idx);
>> }
>> mutex_unlock(&vdpa_nic->lock);
>> }
>> @@ -296,6 +510,12 @@ static u64 ef100_vdpa_get_device_features(struct vdpa_device *vdev)
>> }
>>
>> features |= BIT_ULL(VIRTIO_NET_F_MAC);
>> + /* As QEMU SVQ doesn't implement the following features,
>> + * masking them off to allow Live Migration
>> + */
>> + features &= ~BIT_ULL(VIRTIO_F_IN_ORDER);
>> + features &= ~BIT_ULL(VIRTIO_F_ORDER_PLATFORM);
> It's better not to work around userspace bugs in the kernel. We should
> fix Qemu instead.
There's already a QEMU patch [1] submitted to support
VIRTIO_F_ORDER_PLATFORM but it hasn't concluded yet. Also, there is no
support for VIRTIO_F_IN_ORDER in the kernel virtio driver. The motive of
this change is to have VM Live Migration working with the kernel in-tree
driver without requiring any changes.
Once QEMU is able to handle these features, we can submit a patch to
undo these changes.
>
>> +
>> return features;
>> }
>>
>> @@ -356,6 +576,77 @@ static u32 ef100_vdpa_get_vendor_id(struct vdpa_device *vdev)
>> return EF100_VDPA_VENDOR_ID;
>> }
>>
>> +static u8 ef100_vdpa_get_status(struct vdpa_device *vdev)
>> +{
>> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> + u8 status;
>> +
>> + mutex_lock(&vdpa_nic->lock);
>> + status = vdpa_nic->status;
>> + mutex_unlock(&vdpa_nic->lock);
>> + return status;
>> +}
>> +
>> +static void ef100_vdpa_set_status(struct vdpa_device *vdev, u8 status)
>> +{
>> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> + u8 new_status;
>> + int rc;
>> +
>> + mutex_lock(&vdpa_nic->lock);
>> + if (!status) {
>> + dev_info(&vdev->dev,
>> + "%s: Status received is 0. Device reset being done\n",
>> + __func__);
> This is trigger-able by the userspace. It might be better to use
> dev_dbg() instead.
Will change.
>
>> + ef100_reset_vdpa_device(vdpa_nic);
>> + goto unlock_return;
>> + }
>> + new_status = status & ~vdpa_nic->status;
>> + if (new_status == 0) {
>> + dev_info(&vdev->dev,
>> + "%s: New status same as current status\n", __func__);
> Same here.
Ok.
>
>> + goto unlock_return;
>> + }
>> + if (new_status & VIRTIO_CONFIG_S_FAILED) {
>> + ef100_reset_vdpa_device(vdpa_nic);
>> + goto unlock_return;
>> + }
>> +
>> + if (new_status & VIRTIO_CONFIG_S_ACKNOWLEDGE) {
>> + vdpa_nic->status |= VIRTIO_CONFIG_S_ACKNOWLEDGE;
>> + new_status &= ~VIRTIO_CONFIG_S_ACKNOWLEDGE;
>> + }
>> + if (new_status & VIRTIO_CONFIG_S_DRIVER) {
>> + vdpa_nic->status |= VIRTIO_CONFIG_S_DRIVER;
>> + new_status &= ~VIRTIO_CONFIG_S_DRIVER;
>> + }
>> + if (new_status & VIRTIO_CONFIG_S_FEATURES_OK) {
>> + vdpa_nic->status |= VIRTIO_CONFIG_S_FEATURES_OK;
>> + vdpa_nic->vdpa_state = EF100_VDPA_STATE_NEGOTIATED;
> It might be better to explain the reason we need to track another
> state in vdpa_state instead of simply using the device status.
vdpa_state helps to ensure correct status transitions in the .set_status
callback and safe-guards against incorrect/malicious user-space driver.
>
>> + new_status &= ~VIRTIO_CONFIG_S_FEATURES_OK;
>> + }
>> + if (new_status & VIRTIO_CONFIG_S_DRIVER_OK &&
>> + vdpa_nic->vdpa_state == EF100_VDPA_STATE_NEGOTIATED) {
>> + vdpa_nic->status |= VIRTIO_CONFIG_S_DRIVER_OK;
>> + rc = start_vdpa_device(vdpa_nic);
>> + if (rc) {
>> + dev_err(&vdpa_nic->vdpa_dev.dev,
>> + "%s: vDPA device failed:%d\n", __func__, rc);
>> + vdpa_nic->status &= ~VIRTIO_CONFIG_S_DRIVER_OK;
>> + goto unlock_return;
>> + }
>> + new_status &= ~VIRTIO_CONFIG_S_DRIVER_OK;
>> + }
>> + if (new_status) {
>> + dev_warn(&vdev->dev,
>> + "%s: Mismatch Status: %x & State: %u\n",
>> + __func__, new_status, vdpa_nic->vdpa_state);
>> + }
>> +
>> +unlock_return:
>> + mutex_unlock(&vdpa_nic->lock);
>> +}
>> +
>> static size_t ef100_vdpa_get_config_size(struct vdpa_device *vdev)
>> {
>> return sizeof(struct virtio_net_config);
>> @@ -393,6 +684,20 @@ static void ef100_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
>> vdpa_nic->mac_configured = true;
>> }
>>
>> +static int ef100_vdpa_suspend(struct vdpa_device *vdev)
>> +{
>> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> + int i, rc;
>> +
>> + mutex_lock(&vdpa_nic->lock);
>> + for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++) {
>> + rc = delete_vring(vdpa_nic, i);
> Note that the suspension matters for the whole device. It means the
> config space should not be changed. But the code here only suspends
> the vring, is this intende/d?
Are you referring to the possibility of updating device configuration
(eg. MAC address) using .set_config() after suspend operation? Is there
any other user triggered operation that falls in this category?
>
> Reset may have the same issue.
Could you pls elaborate on the requirement during device reset?
>
> Thanks
[1] https://patchew.org/QEMU/20230213191929.1547497-1-eperezma@redhat.com/
>
>> + if (rc)
>> + break;
>> + }
>> + mutex_unlock(&vdpa_nic->lock);
>> + return rc;
>> +}
>> static void ef100_vdpa_free(struct vdpa_device *vdev)
>> {
>> struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
>> @@ -428,9 +733,13 @@ const struct vdpa_config_ops ef100_vdpa_config_ops = {
>> .get_vq_num_max = ef100_vdpa_get_vq_num_max,
>> .get_device_id = ef100_vdpa_get_device_id,
>> .get_vendor_id = ef100_vdpa_get_vendor_id,
>> + .get_status = ef100_vdpa_get_status,
>> + .set_status = ef100_vdpa_set_status,
>> + .reset = ef100_vdpa_reset,
>> .get_config_size = ef100_vdpa_get_config_size,
>> .get_config = ef100_vdpa_get_config,
>> .set_config = ef100_vdpa_set_config,
>> .get_generation = NULL,
>> + .suspend = ef100_vdpa_suspend,
>> .free = ef100_vdpa_free,
>> };
>> --
>> 2.30.1
>>
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