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vDPA/ifcvf: detect and report max allowed vq size

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Rather than a hardcode, this commit detects
and reports the max value of allowed size
of the virtqueues

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20230612151420.1019504-3-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2023-06-12 23:14:19 +08:00 committed by Michael S. Tsirkin
parent 7712832201
commit ae904d9ce2
3 changed files with 35 additions and 2 deletions
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31
drivers/vdpa/ifcvf/ifcvf_base.c
View File

@ -69,6 +69,37 @@ static int ifcvf_read_config_range(struct pci_dev *dev,
return 0;
}
static u16 ifcvf_get_vq_size(struct ifcvf_hw *hw, u16 qid)
{
u16 queue_size;
vp_iowrite16(qid, &hw->common_cfg->queue_select);
queue_size = vp_ioread16(&hw->common_cfg->queue_size);
return queue_size;
}
/* This function returns the max allowed safe size for
* all virtqueues. It is the minimal size that can be
* suppprted by all virtqueues.
*/
u16 ifcvf_get_max_vq_size(struct ifcvf_hw *hw)
{
u16 queue_size, max_size, qid;
max_size = ifcvf_get_vq_size(hw, 0);
for (qid = 1; qid < hw->nr_vring; qid++) {
queue_size = ifcvf_get_vq_size(hw, qid);
/* 0 means the queue is unavailable */
if (!queue_size)
continue;
max_size = min(queue_size, max_size);
}
return max_size;
}
int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
{
struct virtio_pci_cap cap;

2
drivers/vdpa/ifcvf/ifcvf_base.h
View File

@ -28,7 +28,6 @@
#define IFCVF_MAX_QUEUES 17
#define IFCVF_QUEUE_ALIGNMENT PAGE_SIZE
#define IFCVF_QUEUE_MAX 32768
#define IFCVF_PCI_MAX_RESOURCE 6
#define IFCVF_LM_CFG_SIZE 0x40
@ -138,4 +137,5 @@ bool ifcvf_get_vq_ready(struct ifcvf_hw *hw, u16 qid);
void ifcvf_set_vq_ready(struct ifcvf_hw *hw, u16 qid, bool ready);
void ifcvf_set_driver_features(struct ifcvf_hw *hw, u64 features);
u64 ifcvf_get_driver_features(struct ifcvf_hw *hw);
u16 ifcvf_get_max_vq_size(struct ifcvf_hw *hw);
#endif /* _IFCVF_H_ */

4
drivers/vdpa/ifcvf/ifcvf_main.c
View File

@ -451,7 +451,9 @@ static int ifcvf_vdpa_reset(struct vdpa_device *vdpa_dev)
static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
{
return IFCVF_QUEUE_MAX;
struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
return ifcvf_get_max_vq_size(vf);
}
static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,