This commit adds functions to support virtio_mdev and vhost_mdev.
Implemented interfaces in struct mdev_virtio_ops and supportive
functions including status operations, features operations,
hardware enable / disable and etc.
Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
Signed-off-by: Xiao Wang <xiao.w.wang@xxxxxxxxx>
Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
---
drivers/vhost/ifcvf/ifcvf_base.c | 194 +++++++++++++++++++++++++++++++
drivers/vhost/ifcvf/ifcvf_main.c | 242 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 435 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/ifcvf/ifcvf_base.c b/drivers/vhost/ifcvf/ifcvf_base.c
index ec5985f..d56a069 100644
--- a/drivers/vhost/ifcvf/ifcvf_base.c
+++ b/drivers/vhost/ifcvf/ifcvf_base.c
@@ -127,3 +127,197 @@ int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev)
return 0;
}
+
+u8 ifcvf_get_status(struct ifcvf_hw *hw)
+{
+ return ioread8(&hw->common_cfg->device_status);
+}
+
+void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
+{
+ iowrite8(status, &hw->common_cfg->device_status);
+}
+
+void ifcvf_reset(struct ifcvf_hw *hw)
+{
+ ifcvf_set_status(hw, 0);
+ ifcvf_get_status(hw);
+}
+
+static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
+{
+ if (status != 0)
+ status |= ifcvf_get_status(hw);
+
+ ifcvf_set_status(hw, status);
+ ifcvf_get_status(hw);
+}
+
+u64 ifcvf_get_features(struct ifcvf_hw *hw)
+{
+ struct virtio_pci_common_cfg *cfg = hw->common_cfg;
+ u32 features_lo, features_hi;
+
+ iowrite32(0, &cfg->device_feature_select);
+ features_lo = ioread32(&cfg->device_feature);
+
+ iowrite32(1, &cfg->device_feature_select);
+ features_hi = ioread32(&cfg->device_feature);
+
+ return ((u64)features_hi << 32) | features_lo;
+}
+
+void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
+ void *dst, int length)
+{
+ u8 old_gen, new_gen, *p;
+ int i;
+
+ WARN_ON(offset + length > sizeof(struct virtio_net_config));
+ do {
+ old_gen = ioread8(&hw->common_cfg->config_generation);
+ p = dst;
+ for (i = 0; i < length; i++)
+ *p++ = ioread8((u8 *)hw->net_cfg + offset + i);
+
+ new_gen = ioread8(&hw->common_cfg->config_generation);
+ } while (old_gen != new_gen);
+}
+
+void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
+ const void *src, int length)
+{
+ const u8 *p;
+ int i;
+
+ p = src;
+ WARN_ON(offset + length > sizeof(struct virtio_net_config));
+ for (i = 0; i < length; i++)
+ iowrite8(*p++, (u8 *)hw->net_cfg + offset + i);
+}
+
+static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
+{
+ struct virtio_pci_common_cfg *cfg = hw->common_cfg;
+
+ iowrite32(0, &cfg->guest_feature_select);
+ iowrite32((u32)features, &cfg->guest_feature);
+
+ iowrite32(1, &cfg->guest_feature_select);
+ iowrite32(features >> 32, &cfg->guest_feature);
+}
+
+static int ifcvf_config_features(struct ifcvf_hw *hw)
+{
+ struct ifcvf_adapter *ifcvf;
+
+ ifcvf = vf_to_adapter(hw);
+ ifcvf_set_features(hw, hw->req_features);
+ ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
+
+ if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
+ IFCVF_ERR(ifcvf->dev, "Failed to set FEATURES_OK status\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+void io_write64_twopart(u64 val, u32 *lo, u32 *hi)
+{
+ iowrite32(val & ((1ULL << 32) - 1), lo);
+ iowrite32(val >> 32, hi);
+}
+
+static int ifcvf_hw_enable(struct ifcvf_hw *hw)
+{
+ struct ifcvf_lm_cfg __iomem *ifcvf_lm;
+ struct virtio_pci_common_cfg *cfg;
+ struct ifcvf_adapter *ifcvf;
+ u32 __iomem *idx_addr;
+ u32 i, val;
+
+ ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
+ ifcvf = vf_to_adapter(hw);
+ cfg = hw->common_cfg;
+ iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
+
+ if (ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
+ IFCVF_ERR(ifcvf->dev, "No msix vector for device config\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < hw->nr_vring; i++) {
+ if (!hw->vring[i].ready)
+ break;
+
+ iowrite16(i, &cfg->queue_select);
+ io_write64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
+ &cfg->queue_desc_hi);
+ io_write64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
+ &cfg->queue_avail_hi);
+ io_write64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
+ &cfg->queue_used_hi);
+ iowrite16(hw->vring[i].size, &cfg->queue_size);
+ idx_addr = &ifcvf_lm->vring_lm_cfg[i/IFCVF_MAX_QUEUE_PAIRS * 2].idx_addr[i%IFCVF_MAX_QUEUE_PAIRS * 2];
+ val = hw->vring[i].last_avail_idx |
+ ((u32)hw->vring[i].last_used_idx << 16);
+ iowrite32(val, idx_addr);
+ iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
+
+ if (ioread16(&cfg->queue_msix_vector) ==
+ VIRTIO_MSI_NO_VECTOR) {
+ IFCVF_ERR(ifcvf->dev,
+ "No msix vector for queue %u\n", i);
+ return -EINVAL;
+ }
+
+ iowrite16(1, &cfg->queue_enable);
+ }
+
+ return 0;
+}
+
+static void ifcvf_hw_disable(struct ifcvf_hw *hw)
+{
+ struct virtio_pci_common_cfg *cfg;
+ u32 i;
+
+ cfg = hw->common_cfg;
+ iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
+
+ for (i = 0; i < hw->nr_vring; i++) {
+ iowrite16(i, &cfg->queue_select);
+ iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
+ }
+
+ ioread16(&cfg->queue_msix_vector);
+}
+
+int ifcvf_start_hw(struct ifcvf_hw *hw)
+{
+ ifcvf_reset(hw);
+ ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
+ ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
+
+ if (ifcvf_config_features(hw) < 0)
+ return -EINVAL;
+
+ if (ifcvf_hw_enable(hw) < 0)
+ return -EINVAL;
+
+ ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
+
+ return 0;
+}
+
+void ifcvf_stop_hw(struct ifcvf_hw *hw)
+{
+ ifcvf_hw_disable(hw);
+ ifcvf_reset(hw);
+}
+
+void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
+{
+ iowrite16(qid, hw->vring->notify_addr[qid]);
+}
diff --git a/drivers/vhost/ifcvf/ifcvf_main.c b/drivers/vhost/ifcvf/ifcvf_main.c
index 4f602a3..bce9609 100644
--- a/drivers/vhost/ifcvf/ifcvf_main.c
+++ b/drivers/vhost/ifcvf/ifcvf_main.c
@@ -29,8 +29,248 @@ static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
return IRQ_HANDLED;
}
+static int ifcvf_start_datapath(void *private)
+{
+ struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
+ struct ifcvf_adapter *ifcvf;
+ u8 status;
+ int ret;
+
+ ifcvf = vf_to_adapter(vf);
+ vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
+ ret = ifcvf_start_hw(vf);
+ if (ret < 0) {
+ status = ifcvf_get_status(vf);
+ status |= VIRTIO_CONFIG_S_FAILED;
+ ifcvf_set_status(vf, status);
+ }
+
+ return ret;
+}
+
+static int ifcvf_stop_datapath(void *private)
+{
+ struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
+ int i;
+
+ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
+ vf->vring[i].cb.callback = NULL;
+
+ ifcvf_stop_hw(vf);
+
+ return 0;
+}
+
+static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
+{
+ struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
+ int i;
+
+ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
+ vf->vring[i].last_used_idx = 0;
+ vf->vring[i].last_avail_idx = 0;
+ vf->vring[i].desc = 0;
+ vf->vring[i].avail = 0;
+ vf->vring[i].used = 0;
+ vf->vring[i].ready = 0;
+ vf->vring->cb.callback = NULL;
+ vf->vring->cb.private = NULL;
+ }
+
+ ifcvf_reset(vf);
+}
+
+static struct ifcvf_hw *mdev_to_vf(struct mdev_device *mdev)
+{
+ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
+ struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
+
+ return vf;
+}
+
+static u64 ifcvf_mdev_get_features(struct mdev_device *mdev)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+ u64 features;
+
+ features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
+
+ return features;
+}
+
+static int ifcvf_mdev_set_features(struct mdev_device *mdev, u64 features)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->req_features = features;
+
+ return 0;
+}
+
+static u8 ifcvf_mdev_get_status(struct mdev_device *mdev)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ return ifcvf_get_status(vf);
+}
+
+static void ifcvf_mdev_set_status(struct mdev_device *mdev, u8 status)
+{
+ struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev);
+ struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
+
+ if (status == 0) {
+ ifcvf_stop_datapath(adapter);
+ ifcvf_reset_vring(adapter);
+ return;
+ }
+
+ if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+ if (ifcvf_start_datapath(adapter) < 0)
+ IFCVF_ERR(adapter->dev, "Failed to set mdev status %u\n",
+ status);
+ }
+
+ ifcvf_set_status(vf, status);
+}
+
+static u16 ifcvf_mdev_get_vq_num_max(struct mdev_device *mdev)
+{
+ return IFCVF_QUEUE_MAX;
+}
+
+static u64 ifcvf_mdev_get_vq_state(struct mdev_device *mdev, u16 qid)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+ u16 last_avail_idx;
+ u16 __iomem *idx_addr;
+
+ idx_addr = (u16 __iomem *)(vf->lm_cfg + IFCVF_LM_RING_STATE_OFFSET +
+ (qid / 2) * IFCVF_LM_CFG_SIZE + (qid % 2) * 4);
+ last_avail_idx = ioread16(idx_addr);
+
+ return last_avail_idx;
+}
+
+static int ifcvf_mdev_set_vq_state(struct mdev_device *mdev, u16 qid, u64 num)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->vring[qid].last_avail_idx = num;
+
+ return 0;
+}
+
+static void ifcvf_mdev_set_vq_cb(struct mdev_device *mdev, u16 qid,
+ struct virtio_mdev_callback *cb)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->vring[qid].cb = *cb;
+}
+
+static void ifcvf_mdev_set_vq_ready(struct mdev_device *mdev,
+ u16 qid, bool ready)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->vring[qid].ready = ready;
+}
+
+static bool ifcvf_mdev_get_vq_ready(struct mdev_device *mdev, u16 qid)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ return vf->vring[qid].ready;
+}
+
+static void ifcvf_mdev_set_vq_num(struct mdev_device *mdev, u16 qid, u32 num)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->vring[qid].size = num;
+}
+
+static int ifcvf_mdev_set_vq_address(struct mdev_device *mdev, u16 qid,
+ u64 desc_area, u64 driver_area,
+ u64 device_area)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ vf->vring[qid].desc = desc_area;
+ vf->vring[qid].avail = driver_area;
+ vf->vring[qid].used = device_area;
+
+ return 0;
+}
+
+static void ifcvf_mdev_kick_vq(struct mdev_device *mdev, u16 qid)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ ifcvf_notify_queue(vf, qid);
+}
+
+static u32 ifcvf_mdev_get_generation(struct mdev_device *mdev)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ return ioread8(&vf->common_cfg->config_generation);
+}
+
+static u32 ifcvf_mdev_get_device_id(struct mdev_device *mdev)
+{
+ return VIRTIO_ID_NET;
+}
+
+static u32 ifcvf_mdev_get_vendor_id(struct mdev_device *mdev)
+{
+ return IFCVF_SUBSYS_VENDOR_ID;
+}
+
+static u16 ifcvf_mdev_get_vq_align(struct mdev_device *mdev)
+{
+ return IFCVF_QUEUE_ALIGNMENT;
+}
+
+static void ifcvf_mdev_get_config(struct mdev_device *mdev, unsigned int offset,
+ void *buf, unsigned int len)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ WARN_ON(offset + len > sizeof(struct virtio_net_config));
+ ifcvf_read_net_config(vf, offset, buf, len);
+}
+
+static void ifcvf_mdev_set_config(struct mdev_device *mdev, unsigned int offset,
+ const void *buf, unsigned int len)
+{
+ struct ifcvf_hw *vf = mdev_to_vf(mdev);
+
+ WARN_ON(offset + len > sizeof(struct virtio_net_config));
+ ifcvf_write_net_config(vf, offset, buf, len);
+}
+
static const struct mdev_virtio_ops ifc_mdev_ops = {
- NULL,
+ .get_features = ifcvf_mdev_get_features,
+ .set_features = ifcvf_mdev_set_features,
+ .get_status = ifcvf_mdev_get_status,
+ .set_status = ifcvf_mdev_set_status,
+ .get_vq_num_max = ifcvf_mdev_get_vq_num_max,
+ .get_vq_state = ifcvf_mdev_get_vq_state,
+ .set_vq_state = ifcvf_mdev_set_vq_state,
+ .set_vq_cb = ifcvf_mdev_set_vq_cb,
+ .set_vq_ready = ifcvf_mdev_set_vq_ready,
+ .get_vq_ready = ifcvf_mdev_get_vq_ready,
+ .set_vq_num = ifcvf_mdev_set_vq_num,
+ .set_vq_address = ifcvf_mdev_set_vq_address,
+ .kick_vq = ifcvf_mdev_kick_vq,
+ .get_generation = ifcvf_mdev_get_generation,
+ .get_device_id = ifcvf_mdev_get_device_id,
+ .get_vendor_id = ifcvf_mdev_get_vendor_id,
+ .get_vq_align = ifcvf_mdev_get_vq_align,
+ .get_config = ifcvf_mdev_get_config,
+ .set_config = ifcvf_mdev_set_config,
};
static int ifcvf_init_msix(struct ifcvf_adapter *adapter)
--
1.8.3.1
