diff options
| author | Zhu Lingshan <lingshan.zhu@intel.com> | 2023-06-12 18:14:19 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-07-03 19:15:12 +0300 |
| commit | ae904d9ce2cf8fec34cee72a67fcbee7640dd70f (patch) | |
| tree | 3bff5dae77111d7bd23b1f740c36d0f4eeae72ad /drivers/vdpa | |
| parent | 7712832201eadb871c15ed96be1ec60d1e3ecacf (diff) | |
| download | linux-ae904d9ce2cf8fec34cee72a67fcbee7640dd70f.tar.xz | |
vDPA/ifcvf: detect and report max allowed vq size
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>
Diffstat (limited to 'drivers/vdpa')
| -rw-r--r-- | drivers/vdpa/ifcvf/ifcvf_base.c | 31 | ||||
| -rw-r--r-- | drivers/vdpa/ifcvf/ifcvf_base.h | 2 | ||||
| -rw-r--r-- | drivers/vdpa/ifcvf/ifcvf_main.c | 4 |
3 files changed, 35 insertions, 2 deletions
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c index f86495ace825..f4d7d96c4c86 100644 --- a/drivers/vdpa/ifcvf/ifcvf_base.c +++ b/drivers/vdpa/ifcvf/ifcvf_base.c @@ -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; diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h index fa797184056b..30935a95b672 100644 --- a/drivers/vdpa/ifcvf/ifcvf_base.h +++ b/drivers/vdpa/ifcvf/ifcvf_base.h @@ -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_ */ diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index 2af0de771b49..c3ece395caf7 100644 --- a/drivers/vdpa/ifcvf/ifcvf_main.c +++ b/drivers/vdpa/ifcvf/ifcvf_main.c @@ -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, |