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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/vdpa/vdpa_sim
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/vdpa/vdpa_sim')
-rw-r--r--drivers/vdpa/vdpa_sim/Makefile4
-rw-r--r--drivers/vdpa/vdpa_sim/vdpa_sim.c807
-rw-r--r--drivers/vdpa/vdpa_sim/vdpa_sim.h121
-rw-r--r--drivers/vdpa/vdpa_sim/vdpa_sim_blk.c527
-rw-r--r--drivers/vdpa/vdpa_sim/vdpa_sim_net.c564
5 files changed, 2023 insertions, 0 deletions
diff --git a/drivers/vdpa/vdpa_sim/Makefile b/drivers/vdpa/vdpa_sim/Makefile
new file mode 100644
index 0000000000..d458103302
--- /dev/null
+++ b/drivers/vdpa/vdpa_sim/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_VDPA_SIM) += vdpa_sim.o
+obj-$(CONFIG_VDPA_SIM_NET) += vdpa_sim_net.o
+obj-$(CONFIG_VDPA_SIM_BLOCK) += vdpa_sim_blk.o
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
new file mode 100644
index 0000000000..76d41058ad
--- /dev/null
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -0,0 +1,807 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VDPA device simulator core.
+ *
+ * Copyright (c) 2020, Red Hat Inc. All rights reserved.
+ * Author: Jason Wang <jasowang@redhat.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/dma-map-ops.h>
+#include <linux/vringh.h>
+#include <linux/vdpa.h>
+#include <linux/vhost_iotlb.h>
+#include <uapi/linux/vdpa.h>
+#include <uapi/linux/vhost_types.h>
+
+#include "vdpa_sim.h"
+
+#define DRV_VERSION "0.1"
+#define DRV_AUTHOR "Jason Wang <jasowang@redhat.com>"
+#define DRV_DESC "vDPA Device Simulator core"
+#define DRV_LICENSE "GPL v2"
+
+static int batch_mapping = 1;
+module_param(batch_mapping, int, 0444);
+MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");
+
+static int max_iotlb_entries = 2048;
+module_param(max_iotlb_entries, int, 0444);
+MODULE_PARM_DESC(max_iotlb_entries,
+ "Maximum number of iotlb entries for each address space. 0 means unlimited. (default: 2048)");
+
+static bool use_va = true;
+module_param(use_va, bool, 0444);
+MODULE_PARM_DESC(use_va, "Enable/disable the device's ability to use VA");
+
+#define VDPASIM_QUEUE_ALIGN PAGE_SIZE
+#define VDPASIM_QUEUE_MAX 256
+#define VDPASIM_VENDOR_ID 0
+
+struct vdpasim_mm_work {
+ struct kthread_work work;
+ struct vdpasim *vdpasim;
+ struct mm_struct *mm_to_bind;
+ int ret;
+};
+
+static void vdpasim_mm_work_fn(struct kthread_work *work)
+{
+ struct vdpasim_mm_work *mm_work =
+ container_of(work, struct vdpasim_mm_work, work);
+ struct vdpasim *vdpasim = mm_work->vdpasim;
+
+ mm_work->ret = 0;
+
+ //TODO: should we attach the cgroup of the mm owner?
+ vdpasim->mm_bound = mm_work->mm_to_bind;
+}
+
+static void vdpasim_worker_change_mm_sync(struct vdpasim *vdpasim,
+ struct vdpasim_mm_work *mm_work)
+{
+ struct kthread_work *work = &mm_work->work;
+
+ kthread_init_work(work, vdpasim_mm_work_fn);
+ kthread_queue_work(vdpasim->worker, work);
+
+ kthread_flush_work(work);
+}
+
+static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
+{
+ return container_of(vdpa, struct vdpasim, vdpa);
+}
+
+static void vdpasim_vq_notify(struct vringh *vring)
+{
+ struct vdpasim_virtqueue *vq =
+ container_of(vring, struct vdpasim_virtqueue, vring);
+
+ if (!vq->cb)
+ return;
+
+ vq->cb(vq->private);
+}
+
+static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
+{
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+ uint16_t last_avail_idx = vq->vring.last_avail_idx;
+ struct vring_desc *desc = (struct vring_desc *)
+ (uintptr_t)vq->desc_addr;
+ struct vring_avail *avail = (struct vring_avail *)
+ (uintptr_t)vq->driver_addr;
+ struct vring_used *used = (struct vring_used *)
+ (uintptr_t)vq->device_addr;
+
+ if (use_va && vdpasim->mm_bound) {
+ vringh_init_iotlb_va(&vq->vring, vdpasim->features, vq->num,
+ true, desc, avail, used);
+ } else {
+ vringh_init_iotlb(&vq->vring, vdpasim->features, vq->num,
+ true, desc, avail, used);
+ }
+
+ vq->vring.last_avail_idx = last_avail_idx;
+
+ /*
+ * Since vdpa_sim does not support receive inflight descriptors as a
+ * destination of a migration, let's set both avail_idx and used_idx
+ * the same at vq start. This is how vhost-user works in a
+ * VHOST_SET_VRING_BASE call.
+ *
+ * Although the simple fix is to set last_used_idx at
+ * vdpasim_set_vq_state, it would be reset at vdpasim_queue_ready.
+ */
+ vq->vring.last_used_idx = last_avail_idx;
+ vq->vring.notify = vdpasim_vq_notify;
+}
+
+static void vdpasim_vq_reset(struct vdpasim *vdpasim,
+ struct vdpasim_virtqueue *vq)
+{
+ vq->ready = false;
+ vq->desc_addr = 0;
+ vq->driver_addr = 0;
+ vq->device_addr = 0;
+ vq->cb = NULL;
+ vq->private = NULL;
+ vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features,
+ VDPASIM_QUEUE_MAX, false, NULL, NULL, NULL);
+
+ vq->vring.notify = NULL;
+}
+
+static void vdpasim_do_reset(struct vdpasim *vdpasim)
+{
+ int i;
+
+ spin_lock(&vdpasim->iommu_lock);
+
+ for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
+ vdpasim_vq_reset(vdpasim, &vdpasim->vqs[i]);
+ vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
+ &vdpasim->iommu_lock);
+ }
+
+ for (i = 0; i < vdpasim->dev_attr.nas; i++) {
+ vhost_iotlb_reset(&vdpasim->iommu[i]);
+ vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX,
+ 0, VHOST_MAP_RW);
+ vdpasim->iommu_pt[i] = true;
+ }
+
+ vdpasim->running = true;
+ spin_unlock(&vdpasim->iommu_lock);
+
+ vdpasim->features = 0;
+ vdpasim->status = 0;
+ ++vdpasim->generation;
+}
+
+static const struct vdpa_config_ops vdpasim_config_ops;
+static const struct vdpa_config_ops vdpasim_batch_config_ops;
+
+static void vdpasim_work_fn(struct kthread_work *work)
+{
+ struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
+ struct mm_struct *mm = vdpasim->mm_bound;
+
+ if (use_va && mm) {
+ if (!mmget_not_zero(mm))
+ return;
+ kthread_use_mm(mm);
+ }
+
+ vdpasim->dev_attr.work_fn(vdpasim);
+
+ if (use_va && mm) {
+ kthread_unuse_mm(mm);
+ mmput(mm);
+ }
+}
+
+struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
+ const struct vdpa_dev_set_config *config)
+{
+ const struct vdpa_config_ops *ops;
+ struct vdpa_device *vdpa;
+ struct vdpasim *vdpasim;
+ struct device *dev;
+ int i, ret = -ENOMEM;
+
+ if (!dev_attr->alloc_size)
+ return ERR_PTR(-EINVAL);
+
+ if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
+ if (config->device_features &
+ ~dev_attr->supported_features)
+ return ERR_PTR(-EINVAL);
+ dev_attr->supported_features =
+ config->device_features;
+ }
+
+ if (batch_mapping)
+ ops = &vdpasim_batch_config_ops;
+ else
+ ops = &vdpasim_config_ops;
+
+ vdpa = __vdpa_alloc_device(NULL, ops,
+ dev_attr->ngroups, dev_attr->nas,
+ dev_attr->alloc_size,
+ dev_attr->name, use_va);
+ if (IS_ERR(vdpa)) {
+ ret = PTR_ERR(vdpa);
+ goto err_alloc;
+ }
+
+ vdpasim = vdpa_to_sim(vdpa);
+ vdpasim->dev_attr = *dev_attr;
+ dev = &vdpasim->vdpa.dev;
+
+ kthread_init_work(&vdpasim->work, vdpasim_work_fn);
+ vdpasim->worker = kthread_create_worker(0, "vDPA sim worker: %s",
+ dev_attr->name);
+ if (IS_ERR(vdpasim->worker))
+ goto err_iommu;
+
+ mutex_init(&vdpasim->mutex);
+ spin_lock_init(&vdpasim->iommu_lock);
+
+ dev->dma_mask = &dev->coherent_dma_mask;
+ if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)))
+ goto err_iommu;
+ vdpasim->vdpa.mdev = dev_attr->mgmt_dev;
+
+ vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL);
+ if (!vdpasim->config)
+ goto err_iommu;
+
+ vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue),
+ GFP_KERNEL);
+ if (!vdpasim->vqs)
+ goto err_iommu;
+
+ vdpasim->iommu = kmalloc_array(vdpasim->dev_attr.nas,
+ sizeof(*vdpasim->iommu), GFP_KERNEL);
+ if (!vdpasim->iommu)
+ goto err_iommu;
+
+ vdpasim->iommu_pt = kmalloc_array(vdpasim->dev_attr.nas,
+ sizeof(*vdpasim->iommu_pt), GFP_KERNEL);
+ if (!vdpasim->iommu_pt)
+ goto err_iommu;
+
+ for (i = 0; i < vdpasim->dev_attr.nas; i++)
+ vhost_iotlb_init(&vdpasim->iommu[i], max_iotlb_entries, 0);
+
+ for (i = 0; i < dev_attr->nvqs; i++)
+ vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
+ &vdpasim->iommu_lock);
+
+ vdpasim->vdpa.dma_dev = dev;
+
+ return vdpasim;
+
+err_iommu:
+ put_device(dev);
+err_alloc:
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(vdpasim_create);
+
+void vdpasim_schedule_work(struct vdpasim *vdpasim)
+{
+ kthread_queue_work(vdpasim->worker, &vdpasim->work);
+}
+EXPORT_SYMBOL_GPL(vdpasim_schedule_work);
+
+static int vdpasim_set_vq_address(struct vdpa_device *vdpa, u16 idx,
+ u64 desc_area, u64 driver_area,
+ u64 device_area)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+
+ vq->desc_addr = desc_area;
+ vq->driver_addr = driver_area;
+ vq->device_addr = device_area;
+
+ return 0;
+}
+
+static void vdpasim_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+
+ vq->num = num;
+}
+
+static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+
+ if (!vdpasim->running &&
+ (vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ vdpasim->pending_kick = true;
+ return;
+ }
+
+ if (vq->ready)
+ vdpasim_schedule_work(vdpasim);
+}
+
+static void vdpasim_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
+ struct vdpa_callback *cb)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+
+ vq->cb = cb->callback;
+ vq->private = cb->private;
+}
+
+static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+ bool old_ready;
+
+ mutex_lock(&vdpasim->mutex);
+ old_ready = vq->ready;
+ vq->ready = ready;
+ if (vq->ready && !old_ready) {
+ vdpasim_queue_ready(vdpasim, idx);
+ }
+ mutex_unlock(&vdpasim->mutex);
+}
+
+static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+
+ return vq->ready;
+}
+
+static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
+ const struct vdpa_vq_state *state)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+ struct vringh *vrh = &vq->vring;
+
+ mutex_lock(&vdpasim->mutex);
+ vrh->last_avail_idx = state->split.avail_index;
+ mutex_unlock(&vdpasim->mutex);
+
+ return 0;
+}
+
+static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
+ struct vdpa_vq_state *state)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
+ struct vringh *vrh = &vq->vring;
+
+ state->split.avail_index = vrh->last_avail_idx;
+ return 0;
+}
+
+static int vdpasim_get_vq_stats(struct vdpa_device *vdpa, u16 idx,
+ struct sk_buff *msg,
+ struct netlink_ext_ack *extack)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (vdpasim->dev_attr.get_stats)
+ return vdpasim->dev_attr.get_stats(vdpasim, idx,
+ msg, extack);
+ return -EOPNOTSUPP;
+}
+
+static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
+{
+ return VDPASIM_QUEUE_ALIGN;
+}
+
+static u32 vdpasim_get_vq_group(struct vdpa_device *vdpa, u16 idx)
+{
+ /* RX and TX belongs to group 0, CVQ belongs to group 1 */
+ if (idx == 2)
+ return 1;
+ else
+ return 0;
+}
+
+static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ return vdpasim->dev_attr.supported_features;
+}
+
+static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa)
+{
+ return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
+}
+
+static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ /* DMA mapping must be done by driver */
+ if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
+ return -EINVAL;
+
+ vdpasim->features = features & vdpasim->dev_attr.supported_features;
+
+ return 0;
+}
+
+static u64 vdpasim_get_driver_features(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ return vdpasim->features;
+}
+
+static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
+ struct vdpa_callback *cb)
+{
+ /* We don't support config interrupt */
+}
+
+static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa)
+{
+ return VDPASIM_QUEUE_MAX;
+}
+
+static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ return vdpasim->dev_attr.id;
+}
+
+static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
+{
+ return VDPASIM_VENDOR_ID;
+}
+
+static u8 vdpasim_get_status(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ u8 status;
+
+ mutex_lock(&vdpasim->mutex);
+ status = vdpasim->status;
+ mutex_unlock(&vdpasim->mutex);
+
+ return status;
+}
+
+static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ mutex_lock(&vdpasim->mutex);
+ vdpasim->status = status;
+ mutex_unlock(&vdpasim->mutex);
+}
+
+static int vdpasim_reset(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ mutex_lock(&vdpasim->mutex);
+ vdpasim->status = 0;
+ vdpasim_do_reset(vdpasim);
+ mutex_unlock(&vdpasim->mutex);
+
+ return 0;
+}
+
+static int vdpasim_suspend(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ mutex_lock(&vdpasim->mutex);
+ vdpasim->running = false;
+ mutex_unlock(&vdpasim->mutex);
+
+ return 0;
+}
+
+static int vdpasim_resume(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ int i;
+
+ mutex_lock(&vdpasim->mutex);
+ vdpasim->running = true;
+
+ if (vdpasim->pending_kick) {
+ /* Process pending descriptors */
+ for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
+ vdpasim_kick_vq(vdpa, i);
+
+ vdpasim->pending_kick = false;
+ }
+
+ mutex_unlock(&vdpasim->mutex);
+
+ return 0;
+}
+
+static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ return vdpasim->dev_attr.config_size;
+}
+
+static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
+ void *buf, unsigned int len)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (offset + len > vdpasim->dev_attr.config_size)
+ return;
+
+ if (vdpasim->dev_attr.get_config)
+ vdpasim->dev_attr.get_config(vdpasim, vdpasim->config);
+
+ memcpy(buf, vdpasim->config + offset, len);
+}
+
+static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
+ const void *buf, unsigned int len)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (offset + len > vdpasim->dev_attr.config_size)
+ return;
+
+ memcpy(vdpasim->config + offset, buf, len);
+
+ if (vdpasim->dev_attr.set_config)
+ vdpasim->dev_attr.set_config(vdpasim, vdpasim->config);
+}
+
+static u32 vdpasim_get_generation(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ return vdpasim->generation;
+}
+
+static struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa)
+{
+ struct vdpa_iova_range range = {
+ .first = 0ULL,
+ .last = ULLONG_MAX,
+ };
+
+ return range;
+}
+
+static int vdpasim_set_group_asid(struct vdpa_device *vdpa, unsigned int group,
+ unsigned int asid)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vhost_iotlb *iommu;
+ int i;
+
+ if (group > vdpasim->dev_attr.ngroups)
+ return -EINVAL;
+
+ if (asid >= vdpasim->dev_attr.nas)
+ return -EINVAL;
+
+ iommu = &vdpasim->iommu[asid];
+
+ mutex_lock(&vdpasim->mutex);
+
+ for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
+ if (vdpasim_get_vq_group(vdpa, i) == group)
+ vringh_set_iotlb(&vdpasim->vqs[i].vring, iommu,
+ &vdpasim->iommu_lock);
+
+ mutex_unlock(&vdpasim->mutex);
+
+ return 0;
+}
+
+static int vdpasim_set_map(struct vdpa_device *vdpa, unsigned int asid,
+ struct vhost_iotlb *iotlb)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vhost_iotlb_map *map;
+ struct vhost_iotlb *iommu;
+ u64 start = 0ULL, last = 0ULL - 1;
+ int ret;
+
+ if (asid >= vdpasim->dev_attr.nas)
+ return -EINVAL;
+
+ spin_lock(&vdpasim->iommu_lock);
+
+ iommu = &vdpasim->iommu[asid];
+ vhost_iotlb_reset(iommu);
+ vdpasim->iommu_pt[asid] = false;
+
+ for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
+ map = vhost_iotlb_itree_next(map, start, last)) {
+ ret = vhost_iotlb_add_range(iommu, map->start,
+ map->last, map->addr, map->perm);
+ if (ret)
+ goto err;
+ }
+ spin_unlock(&vdpasim->iommu_lock);
+ return 0;
+
+err:
+ vhost_iotlb_reset(iommu);
+ spin_unlock(&vdpasim->iommu_lock);
+ return ret;
+}
+
+static int vdpasim_bind_mm(struct vdpa_device *vdpa, struct mm_struct *mm)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_mm_work mm_work;
+
+ mm_work.vdpasim = vdpasim;
+ mm_work.mm_to_bind = mm;
+
+ vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
+
+ return mm_work.ret;
+}
+
+static void vdpasim_unbind_mm(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ struct vdpasim_mm_work mm_work;
+
+ mm_work.vdpasim = vdpasim;
+ mm_work.mm_to_bind = NULL;
+
+ vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
+}
+
+static int vdpasim_dma_map(struct vdpa_device *vdpa, unsigned int asid,
+ u64 iova, u64 size,
+ u64 pa, u32 perm, void *opaque)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ int ret;
+
+ if (asid >= vdpasim->dev_attr.nas)
+ return -EINVAL;
+
+ spin_lock(&vdpasim->iommu_lock);
+ if (vdpasim->iommu_pt[asid]) {
+ vhost_iotlb_reset(&vdpasim->iommu[asid]);
+ vdpasim->iommu_pt[asid] = false;
+ }
+ ret = vhost_iotlb_add_range_ctx(&vdpasim->iommu[asid], iova,
+ iova + size - 1, pa, perm, opaque);
+ spin_unlock(&vdpasim->iommu_lock);
+
+ return ret;
+}
+
+static int vdpasim_dma_unmap(struct vdpa_device *vdpa, unsigned int asid,
+ u64 iova, u64 size)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (asid >= vdpasim->dev_attr.nas)
+ return -EINVAL;
+
+ if (vdpasim->iommu_pt[asid]) {
+ vhost_iotlb_reset(&vdpasim->iommu[asid]);
+ vdpasim->iommu_pt[asid] = false;
+ }
+
+ spin_lock(&vdpasim->iommu_lock);
+ vhost_iotlb_del_range(&vdpasim->iommu[asid], iova, iova + size - 1);
+ spin_unlock(&vdpasim->iommu_lock);
+
+ return 0;
+}
+
+static void vdpasim_free(struct vdpa_device *vdpa)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+ int i;
+
+ kthread_cancel_work_sync(&vdpasim->work);
+ kthread_destroy_worker(vdpasim->worker);
+
+ for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
+ vringh_kiov_cleanup(&vdpasim->vqs[i].out_iov);
+ vringh_kiov_cleanup(&vdpasim->vqs[i].in_iov);
+ }
+
+ vdpasim->dev_attr.free(vdpasim);
+
+ for (i = 0; i < vdpasim->dev_attr.nas; i++)
+ vhost_iotlb_reset(&vdpasim->iommu[i]);
+ kfree(vdpasim->iommu);
+ kfree(vdpasim->iommu_pt);
+ kfree(vdpasim->vqs);
+ kfree(vdpasim->config);
+}
+
+static const struct vdpa_config_ops vdpasim_config_ops = {
+ .set_vq_address = vdpasim_set_vq_address,
+ .set_vq_num = vdpasim_set_vq_num,
+ .kick_vq = vdpasim_kick_vq,
+ .set_vq_cb = vdpasim_set_vq_cb,
+ .set_vq_ready = vdpasim_set_vq_ready,
+ .get_vq_ready = vdpasim_get_vq_ready,
+ .set_vq_state = vdpasim_set_vq_state,
+ .get_vendor_vq_stats = vdpasim_get_vq_stats,
+ .get_vq_state = vdpasim_get_vq_state,
+ .get_vq_align = vdpasim_get_vq_align,
+ .get_vq_group = vdpasim_get_vq_group,
+ .get_device_features = vdpasim_get_device_features,
+ .get_backend_features = vdpasim_get_backend_features,
+ .set_driver_features = vdpasim_set_driver_features,
+ .get_driver_features = vdpasim_get_driver_features,
+ .set_config_cb = vdpasim_set_config_cb,
+ .get_vq_num_max = vdpasim_get_vq_num_max,
+ .get_device_id = vdpasim_get_device_id,
+ .get_vendor_id = vdpasim_get_vendor_id,
+ .get_status = vdpasim_get_status,
+ .set_status = vdpasim_set_status,
+ .reset = vdpasim_reset,
+ .suspend = vdpasim_suspend,
+ .resume = vdpasim_resume,
+ .get_config_size = vdpasim_get_config_size,
+ .get_config = vdpasim_get_config,
+ .set_config = vdpasim_set_config,
+ .get_generation = vdpasim_get_generation,
+ .get_iova_range = vdpasim_get_iova_range,
+ .set_group_asid = vdpasim_set_group_asid,
+ .dma_map = vdpasim_dma_map,
+ .dma_unmap = vdpasim_dma_unmap,
+ .bind_mm = vdpasim_bind_mm,
+ .unbind_mm = vdpasim_unbind_mm,
+ .free = vdpasim_free,
+};
+
+static const struct vdpa_config_ops vdpasim_batch_config_ops = {
+ .set_vq_address = vdpasim_set_vq_address,
+ .set_vq_num = vdpasim_set_vq_num,
+ .kick_vq = vdpasim_kick_vq,
+ .set_vq_cb = vdpasim_set_vq_cb,
+ .set_vq_ready = vdpasim_set_vq_ready,
+ .get_vq_ready = vdpasim_get_vq_ready,
+ .set_vq_state = vdpasim_set_vq_state,
+ .get_vendor_vq_stats = vdpasim_get_vq_stats,
+ .get_vq_state = vdpasim_get_vq_state,
+ .get_vq_align = vdpasim_get_vq_align,
+ .get_vq_group = vdpasim_get_vq_group,
+ .get_device_features = vdpasim_get_device_features,
+ .get_backend_features = vdpasim_get_backend_features,
+ .set_driver_features = vdpasim_set_driver_features,
+ .get_driver_features = vdpasim_get_driver_features,
+ .set_config_cb = vdpasim_set_config_cb,
+ .get_vq_num_max = vdpasim_get_vq_num_max,
+ .get_device_id = vdpasim_get_device_id,
+ .get_vendor_id = vdpasim_get_vendor_id,
+ .get_status = vdpasim_get_status,
+ .set_status = vdpasim_set_status,
+ .reset = vdpasim_reset,
+ .suspend = vdpasim_suspend,
+ .resume = vdpasim_resume,
+ .get_config_size = vdpasim_get_config_size,
+ .get_config = vdpasim_get_config,
+ .set_config = vdpasim_set_config,
+ .get_generation = vdpasim_get_generation,
+ .get_iova_range = vdpasim_get_iova_range,
+ .set_group_asid = vdpasim_set_group_asid,
+ .set_map = vdpasim_set_map,
+ .bind_mm = vdpasim_bind_mm,
+ .unbind_mm = vdpasim_unbind_mm,
+ .free = vdpasim_free,
+};
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE(DRV_LICENSE);
+MODULE_AUTHOR(DRV_AUTHOR);
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
new file mode 100644
index 0000000000..bb137e4797
--- /dev/null
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020, Red Hat Inc. All rights reserved.
+ */
+
+#ifndef _VDPA_SIM_H
+#define _VDPA_SIM_H
+
+#include <linux/iova.h>
+#include <linux/vringh.h>
+#include <linux/vdpa.h>
+#include <linux/virtio_byteorder.h>
+#include <linux/vhost_iotlb.h>
+#include <uapi/linux/virtio_config.h>
+
+#define VDPASIM_FEATURES ((1ULL << VIRTIO_F_ANY_LAYOUT) | \
+ (1ULL << VIRTIO_F_VERSION_1) | \
+ (1ULL << VIRTIO_F_ACCESS_PLATFORM))
+
+struct vdpasim;
+
+struct vdpasim_virtqueue {
+ struct vringh vring;
+ struct vringh_kiov in_iov;
+ struct vringh_kiov out_iov;
+ unsigned short head;
+ bool ready;
+ u64 desc_addr;
+ u64 device_addr;
+ u64 driver_addr;
+ u32 num;
+ void *private;
+ irqreturn_t (*cb)(void *data);
+};
+
+struct vdpasim_dev_attr {
+ struct vdpa_mgmt_dev *mgmt_dev;
+ const char *name;
+ u64 supported_features;
+ size_t alloc_size;
+ size_t config_size;
+ int nvqs;
+ u32 id;
+ u32 ngroups;
+ u32 nas;
+
+ void (*work_fn)(struct vdpasim *vdpasim);
+ void (*get_config)(struct vdpasim *vdpasim, void *config);
+ void (*set_config)(struct vdpasim *vdpasim, const void *config);
+ int (*get_stats)(struct vdpasim *vdpasim, u16 idx,
+ struct sk_buff *msg,
+ struct netlink_ext_ack *extack);
+ void (*free)(struct vdpasim *vdpasim);
+};
+
+/* State of each vdpasim device */
+struct vdpasim {
+ struct vdpa_device vdpa;
+ struct vdpasim_virtqueue *vqs;
+ struct kthread_worker *worker;
+ struct kthread_work work;
+ struct mm_struct *mm_bound;
+ struct vdpasim_dev_attr dev_attr;
+ /* mutex to synchronize virtqueue state */
+ struct mutex mutex;
+ /* virtio config according to device type */
+ void *config;
+ struct vhost_iotlb *iommu;
+ bool *iommu_pt;
+ u32 status;
+ u32 generation;
+ u64 features;
+ u32 groups;
+ bool running;
+ bool pending_kick;
+ /* spinlock to synchronize iommu table */
+ spinlock_t iommu_lock;
+};
+
+struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
+ const struct vdpa_dev_set_config *config);
+void vdpasim_schedule_work(struct vdpasim *vdpasim);
+
+/* TODO: cross-endian support */
+static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
+{
+ return virtio_legacy_is_little_endian() ||
+ (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
+}
+
+static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
+{
+ return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
+{
+ return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
+{
+ return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
+{
+ return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)
+{
+ return __virtio64_to_cpu(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline __virtio64 cpu_to_vdpasim64(struct vdpasim *vdpasim, u64 val)
+{
+ return __cpu_to_virtio64(vdpasim_is_little_endian(vdpasim), val);
+}
+
+#endif
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
new file mode 100644
index 0000000000..b137f36793
--- /dev/null
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -0,0 +1,527 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VDPA simulator for block device.
+ *
+ * Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2021, Red Hat Inc. All rights reserved.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/vringh.h>
+#include <linux/vdpa.h>
+#include <uapi/linux/virtio_blk.h>
+
+#include "vdpa_sim.h"
+
+#define DRV_VERSION "0.1"
+#define DRV_AUTHOR "Max Gurtovoy <mgurtovoy@nvidia.com>"
+#define DRV_DESC "vDPA Device Simulator for block device"
+#define DRV_LICENSE "GPL v2"
+
+#define VDPASIM_BLK_FEATURES (VDPASIM_FEATURES | \
+ (1ULL << VIRTIO_BLK_F_FLUSH) | \
+ (1ULL << VIRTIO_BLK_F_SIZE_MAX) | \
+ (1ULL << VIRTIO_BLK_F_SEG_MAX) | \
+ (1ULL << VIRTIO_BLK_F_BLK_SIZE) | \
+ (1ULL << VIRTIO_BLK_F_TOPOLOGY) | \
+ (1ULL << VIRTIO_BLK_F_MQ) | \
+ (1ULL << VIRTIO_BLK_F_DISCARD) | \
+ (1ULL << VIRTIO_BLK_F_WRITE_ZEROES))
+
+#define VDPASIM_BLK_CAPACITY 0x40000
+#define VDPASIM_BLK_SIZE_MAX 0x1000
+#define VDPASIM_BLK_SEG_MAX 32
+#define VDPASIM_BLK_DWZ_MAX_SECTORS UINT_MAX
+
+/* 1 virtqueue, 1 address space, 1 virtqueue group */
+#define VDPASIM_BLK_VQ_NUM 1
+#define VDPASIM_BLK_AS_NUM 1
+#define VDPASIM_BLK_GROUP_NUM 1
+
+struct vdpasim_blk {
+ struct vdpasim vdpasim;
+ void *buffer;
+ bool shared_backend;
+};
+
+static struct vdpasim_blk *sim_to_blk(struct vdpasim *vdpasim)
+{
+ return container_of(vdpasim, struct vdpasim_blk, vdpasim);
+}
+
+static char vdpasim_blk_id[VIRTIO_BLK_ID_BYTES] = "vdpa_blk_sim";
+
+static bool shared_backend;
+module_param(shared_backend, bool, 0444);
+MODULE_PARM_DESC(shared_backend, "Enable the shared backend between virtio-blk devices");
+
+static void *shared_buffer;
+/* mutex to synchronize shared_buffer access */
+static DEFINE_MUTEX(shared_buffer_mutex);
+
+static void vdpasim_blk_buffer_lock(struct vdpasim_blk *blk)
+{
+ if (blk->shared_backend)
+ mutex_lock(&shared_buffer_mutex);
+}
+
+static void vdpasim_blk_buffer_unlock(struct vdpasim_blk *blk)
+{
+ if (blk->shared_backend)
+ mutex_unlock(&shared_buffer_mutex);
+}
+
+static bool vdpasim_blk_check_range(struct vdpasim *vdpasim, u64 start_sector,
+ u64 num_sectors, u64 max_sectors)
+{
+ if (start_sector > VDPASIM_BLK_CAPACITY) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "starting sector exceeds the capacity - start: 0x%llx capacity: 0x%x\n",
+ start_sector, VDPASIM_BLK_CAPACITY);
+ }
+
+ if (num_sectors > max_sectors) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "number of sectors exceeds the max allowed in a request - num: 0x%llx max: 0x%llx\n",
+ num_sectors, max_sectors);
+ return false;
+ }
+
+ if (num_sectors > VDPASIM_BLK_CAPACITY - start_sector) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "request exceeds the capacity - start: 0x%llx num: 0x%llx capacity: 0x%x\n",
+ start_sector, num_sectors, VDPASIM_BLK_CAPACITY);
+ return false;
+ }
+
+ return true;
+}
+
+/* Returns 'true' if the request is handled (with or without an I/O error)
+ * and the status is correctly written in the last byte of the 'in iov',
+ * 'false' otherwise.
+ */
+static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
+ struct vdpasim_virtqueue *vq)
+{
+ struct vdpasim_blk *blk = sim_to_blk(vdpasim);
+ size_t pushed = 0, to_pull, to_push;
+ struct virtio_blk_outhdr hdr;
+ bool handled = false;
+ ssize_t bytes;
+ loff_t offset;
+ u64 sector;
+ u8 status;
+ u32 type;
+ int ret;
+
+ ret = vringh_getdesc_iotlb(&vq->vring, &vq->out_iov, &vq->in_iov,
+ &vq->head, GFP_ATOMIC);
+ if (ret != 1)
+ return false;
+
+ if (vq->out_iov.used < 1 || vq->in_iov.used < 1) {
+ dev_dbg(&vdpasim->vdpa.dev, "missing headers - out_iov: %u in_iov %u\n",
+ vq->out_iov.used, vq->in_iov.used);
+ goto err;
+ }
+
+ if (vq->in_iov.iov[vq->in_iov.used - 1].iov_len < 1) {
+ dev_dbg(&vdpasim->vdpa.dev, "request in header too short\n");
+ goto err;
+ }
+
+ /* The last byte is the status and we checked if the last iov has
+ * enough room for it.
+ */
+ to_push = vringh_kiov_length(&vq->in_iov) - 1;
+
+ to_pull = vringh_kiov_length(&vq->out_iov);
+
+ bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->out_iov, &hdr,
+ sizeof(hdr));
+ if (bytes != sizeof(hdr)) {
+ dev_dbg(&vdpasim->vdpa.dev, "request out header too short\n");
+ goto err;
+ }
+
+ to_pull -= bytes;
+
+ type = vdpasim32_to_cpu(vdpasim, hdr.type);
+ sector = vdpasim64_to_cpu(vdpasim, hdr.sector);
+ offset = sector << SECTOR_SHIFT;
+ status = VIRTIO_BLK_S_OK;
+
+ if (type != VIRTIO_BLK_T_IN && type != VIRTIO_BLK_T_OUT &&
+ sector != 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "sector must be 0 for %u request - sector: 0x%llx\n",
+ type, sector);
+ status = VIRTIO_BLK_S_IOERR;
+ goto err_status;
+ }
+
+ switch (type) {
+ case VIRTIO_BLK_T_IN:
+ if (!vdpasim_blk_check_range(vdpasim, sector,
+ to_push >> SECTOR_SHIFT,
+ VDPASIM_BLK_SIZE_MAX * VDPASIM_BLK_SEG_MAX)) {
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ vdpasim_blk_buffer_lock(blk);
+ bytes = vringh_iov_push_iotlb(&vq->vring, &vq->in_iov,
+ blk->buffer + offset, to_push);
+ vdpasim_blk_buffer_unlock(blk);
+ if (bytes < 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "vringh_iov_push_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
+ bytes, offset, to_push);
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ pushed += bytes;
+ break;
+
+ case VIRTIO_BLK_T_OUT:
+ if (!vdpasim_blk_check_range(vdpasim, sector,
+ to_pull >> SECTOR_SHIFT,
+ VDPASIM_BLK_SIZE_MAX * VDPASIM_BLK_SEG_MAX)) {
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ vdpasim_blk_buffer_lock(blk);
+ bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->out_iov,
+ blk->buffer + offset, to_pull);
+ vdpasim_blk_buffer_unlock(blk);
+ if (bytes < 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "vringh_iov_pull_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
+ bytes, offset, to_pull);
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+ break;
+
+ case VIRTIO_BLK_T_GET_ID:
+ bytes = vringh_iov_push_iotlb(&vq->vring, &vq->in_iov,
+ vdpasim_blk_id,
+ VIRTIO_BLK_ID_BYTES);
+ if (bytes < 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "vringh_iov_push_iotlb() error: %zd\n", bytes);
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ pushed += bytes;
+ break;
+
+ case VIRTIO_BLK_T_FLUSH:
+ /* nothing to do */
+ break;
+
+ case VIRTIO_BLK_T_DISCARD:
+ case VIRTIO_BLK_T_WRITE_ZEROES: {
+ struct virtio_blk_discard_write_zeroes range;
+ u32 num_sectors, flags;
+
+ if (to_pull != sizeof(range)) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "discard/write_zeroes header len: 0x%zx [expected: 0x%zx]\n",
+ to_pull, sizeof(range));
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->out_iov, &range,
+ to_pull);
+ if (bytes < 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "vringh_iov_pull_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
+ bytes, offset, to_pull);
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ sector = le64_to_cpu(range.sector);
+ offset = sector << SECTOR_SHIFT;
+ num_sectors = le32_to_cpu(range.num_sectors);
+ flags = le32_to_cpu(range.flags);
+
+ if (type == VIRTIO_BLK_T_DISCARD && flags != 0) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "discard unexpected flags set - flags: 0x%x\n",
+ flags);
+ status = VIRTIO_BLK_S_UNSUPP;
+ break;
+ }
+
+ if (type == VIRTIO_BLK_T_WRITE_ZEROES &&
+ flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
+ dev_dbg(&vdpasim->vdpa.dev,
+ "write_zeroes unexpected flags set - flags: 0x%x\n",
+ flags);
+ status = VIRTIO_BLK_S_UNSUPP;
+ break;
+ }
+
+ if (!vdpasim_blk_check_range(vdpasim, sector, num_sectors,
+ VDPASIM_BLK_DWZ_MAX_SECTORS)) {
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+ if (type == VIRTIO_BLK_T_WRITE_ZEROES) {
+ vdpasim_blk_buffer_lock(blk);
+ memset(blk->buffer + offset, 0,
+ num_sectors << SECTOR_SHIFT);
+ vdpasim_blk_buffer_unlock(blk);
+ }
+
+ break;
+ }
+ default:
+ dev_dbg(&vdpasim->vdpa.dev,
+ "Unsupported request type %d\n", type);
+ status = VIRTIO_BLK_S_IOERR;
+ break;
+ }
+
+err_status:
+ /* If some operations fail, we need to skip the remaining bytes
+ * to put the status in the last byte
+ */
+ if (to_push - pushed > 0)
+ vringh_kiov_advance(&vq->in_iov, to_push - pushed);
+
+ /* Last byte is the status */
+ bytes = vringh_iov_push_iotlb(&vq->vring, &vq->in_iov, &status, 1);
+ if (bytes != 1)
+ goto err;
+
+ pushed += bytes;
+
+ /* Make sure data is wrote before advancing index */
+ smp_wmb();
+
+ handled = true;
+
+err:
+ vringh_complete_iotlb(&vq->vring, vq->head, pushed);
+
+ return handled;
+}
+
+static void vdpasim_blk_work(struct vdpasim *vdpasim)
+{
+ bool reschedule = false;
+ int i;
+
+ mutex_lock(&vdpasim->mutex);
+
+ if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
+ goto out;
+
+ if (!vdpasim->running)
+ goto out;
+
+ for (i = 0; i < VDPASIM_BLK_VQ_NUM; i++) {
+ struct vdpasim_virtqueue *vq = &vdpasim->vqs[i];
+ int reqs = 0;
+
+ if (!vq->ready)
+ continue;
+
+ while (vdpasim_blk_handle_req(vdpasim, vq)) {
+ /* Make sure used is visible before rasing the interrupt. */
+ smp_wmb();
+
+ local_bh_disable();
+ if (vringh_need_notify_iotlb(&vq->vring) > 0)
+ vringh_notify(&vq->vring);
+ local_bh_enable();
+
+ if (++reqs > 4) {
+ reschedule = true;
+ break;
+ }
+ }
+ }
+out:
+ mutex_unlock(&vdpasim->mutex);
+
+ if (reschedule)
+ vdpasim_schedule_work(vdpasim);
+}
+
+static void vdpasim_blk_get_config(struct vdpasim *vdpasim, void *config)
+{
+ struct virtio_blk_config *blk_config = config;
+
+ memset(config, 0, sizeof(struct virtio_blk_config));
+
+ blk_config->capacity = cpu_to_vdpasim64(vdpasim, VDPASIM_BLK_CAPACITY);
+ blk_config->size_max = cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_SIZE_MAX);
+ blk_config->seg_max = cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_SEG_MAX);
+ blk_config->num_queues = cpu_to_vdpasim16(vdpasim, VDPASIM_BLK_VQ_NUM);
+ blk_config->min_io_size = cpu_to_vdpasim16(vdpasim, 1);
+ blk_config->opt_io_size = cpu_to_vdpasim32(vdpasim, 1);
+ blk_config->blk_size = cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
+ /* VIRTIO_BLK_F_DISCARD */
+ blk_config->discard_sector_alignment =
+ cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
+ blk_config->max_discard_sectors =
+ cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_DWZ_MAX_SECTORS);
+ blk_config->max_discard_seg = cpu_to_vdpasim32(vdpasim, 1);
+ /* VIRTIO_BLK_F_WRITE_ZEROES */
+ blk_config->max_write_zeroes_sectors =
+ cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_DWZ_MAX_SECTORS);
+ blk_config->max_write_zeroes_seg = cpu_to_vdpasim32(vdpasim, 1);
+
+}
+
+static void vdpasim_blk_free(struct vdpasim *vdpasim)
+{
+ struct vdpasim_blk *blk = sim_to_blk(vdpasim);
+
+ if (!blk->shared_backend)
+ kvfree(blk->buffer);
+}
+
+static void vdpasim_blk_mgmtdev_release(struct device *dev)
+{
+}
+
+static struct device vdpasim_blk_mgmtdev = {
+ .init_name = "vdpasim_blk",
+ .release = vdpasim_blk_mgmtdev_release,
+};
+
+static int vdpasim_blk_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
+ const struct vdpa_dev_set_config *config)
+{
+ struct vdpasim_dev_attr dev_attr = {};
+ struct vdpasim_blk *blk;
+ struct vdpasim *simdev;
+ int ret;
+
+ dev_attr.mgmt_dev = mdev;
+ dev_attr.name = name;
+ dev_attr.id = VIRTIO_ID_BLOCK;
+ dev_attr.supported_features = VDPASIM_BLK_FEATURES;
+ dev_attr.nvqs = VDPASIM_BLK_VQ_NUM;
+ dev_attr.ngroups = VDPASIM_BLK_GROUP_NUM;
+ dev_attr.nas = VDPASIM_BLK_AS_NUM;
+ dev_attr.alloc_size = sizeof(struct vdpasim_blk);
+ dev_attr.config_size = sizeof(struct virtio_blk_config);
+ dev_attr.get_config = vdpasim_blk_get_config;
+ dev_attr.work_fn = vdpasim_blk_work;
+ dev_attr.free = vdpasim_blk_free;
+
+ simdev = vdpasim_create(&dev_attr, config);
+ if (IS_ERR(simdev))
+ return PTR_ERR(simdev);
+
+ blk = sim_to_blk(simdev);
+ blk->shared_backend = shared_backend;
+
+ if (blk->shared_backend) {
+ blk->buffer = shared_buffer;
+ } else {
+ blk->buffer = kvzalloc(VDPASIM_BLK_CAPACITY << SECTOR_SHIFT,
+ GFP_KERNEL);
+ if (!blk->buffer) {
+ ret = -ENOMEM;
+ goto put_dev;
+ }
+ }
+
+ ret = _vdpa_register_device(&simdev->vdpa, VDPASIM_BLK_VQ_NUM);
+ if (ret)
+ goto put_dev;
+
+ return 0;
+
+put_dev:
+ put_device(&simdev->vdpa.dev);
+ return ret;
+}
+
+static void vdpasim_blk_dev_del(struct vdpa_mgmt_dev *mdev,
+ struct vdpa_device *dev)
+{
+ struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
+
+ _vdpa_unregister_device(&simdev->vdpa);
+}
+
+static const struct vdpa_mgmtdev_ops vdpasim_blk_mgmtdev_ops = {
+ .dev_add = vdpasim_blk_dev_add,
+ .dev_del = vdpasim_blk_dev_del
+};
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct vdpa_mgmt_dev mgmt_dev = {
+ .device = &vdpasim_blk_mgmtdev,
+ .id_table = id_table,
+ .ops = &vdpasim_blk_mgmtdev_ops,
+};
+
+static int __init vdpasim_blk_init(void)
+{
+ int ret;
+
+ ret = device_register(&vdpasim_blk_mgmtdev);
+ if (ret) {
+ put_device(&vdpasim_blk_mgmtdev);
+ return ret;
+ }
+
+ ret = vdpa_mgmtdev_register(&mgmt_dev);
+ if (ret)
+ goto parent_err;
+
+ if (shared_backend) {
+ shared_buffer = kvzalloc(VDPASIM_BLK_CAPACITY << SECTOR_SHIFT,
+ GFP_KERNEL);
+ if (!shared_buffer) {
+ ret = -ENOMEM;
+ goto mgmt_dev_err;
+ }
+ }
+
+ return 0;
+mgmt_dev_err:
+ vdpa_mgmtdev_unregister(&mgmt_dev);
+parent_err:
+ device_unregister(&vdpasim_blk_mgmtdev);
+ return ret;
+}
+
+static void __exit vdpasim_blk_exit(void)
+{
+ kvfree(shared_buffer);
+ vdpa_mgmtdev_unregister(&mgmt_dev);
+ device_unregister(&vdpasim_blk_mgmtdev);
+}
+
+module_init(vdpasim_blk_init)
+module_exit(vdpasim_blk_exit)
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE(DRV_LICENSE);
+MODULE_AUTHOR(DRV_AUTHOR);
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
new file mode 100644
index 0000000000..cfe9629118
--- /dev/null
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -0,0 +1,564 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VDPA simulator for networking device.
+ *
+ * Copyright (c) 2020, Red Hat Inc. All rights reserved.
+ * Author: Jason Wang <jasowang@redhat.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/etherdevice.h>
+#include <linux/vringh.h>
+#include <linux/vdpa.h>
+#include <net/netlink.h>
+#include <uapi/linux/virtio_net.h>
+#include <uapi/linux/vdpa.h>
+
+#include "vdpa_sim.h"
+
+#define DRV_VERSION "0.1"
+#define DRV_AUTHOR "Jason Wang <jasowang@redhat.com>"
+#define DRV_DESC "vDPA Device Simulator for networking device"
+#define DRV_LICENSE "GPL v2"
+
+#define VDPASIM_NET_FEATURES (VDPASIM_FEATURES | \
+ (1ULL << VIRTIO_NET_F_MAC) | \
+ (1ULL << VIRTIO_NET_F_STATUS) | \
+ (1ULL << VIRTIO_NET_F_MTU) | \
+ (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
+ (1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR))
+
+/* 3 virtqueues, 2 address spaces, 2 virtqueue groups */
+#define VDPASIM_NET_VQ_NUM 3
+#define VDPASIM_NET_AS_NUM 2
+#define VDPASIM_NET_GROUP_NUM 2
+
+struct vdpasim_dataq_stats {
+ struct u64_stats_sync syncp;
+ u64 pkts;
+ u64 bytes;
+ u64 drops;
+ u64 errors;
+ u64 overruns;
+};
+
+struct vdpasim_cq_stats {
+ struct u64_stats_sync syncp;
+ u64 requests;
+ u64 successes;
+ u64 errors;
+};
+
+struct vdpasim_net{
+ struct vdpasim vdpasim;
+ struct vdpasim_dataq_stats tx_stats;
+ struct vdpasim_dataq_stats rx_stats;
+ struct vdpasim_cq_stats cq_stats;
+ void *buffer;
+};
+
+static struct vdpasim_net *sim_to_net(struct vdpasim *vdpasim)
+{
+ return container_of(vdpasim, struct vdpasim_net, vdpasim);
+}
+
+static void vdpasim_net_complete(struct vdpasim_virtqueue *vq, size_t len)
+{
+ /* Make sure data is wrote before advancing index */
+ smp_wmb();
+
+ vringh_complete_iotlb(&vq->vring, vq->head, len);
+
+ /* Make sure used is visible before rasing the interrupt. */
+ smp_wmb();
+
+ local_bh_disable();
+ if (vringh_need_notify_iotlb(&vq->vring) > 0)
+ vringh_notify(&vq->vring);
+ local_bh_enable();
+}
+
+static bool receive_filter(struct vdpasim *vdpasim, size_t len)
+{
+ bool modern = vdpasim->features & (1ULL << VIRTIO_F_VERSION_1);
+ size_t hdr_len = modern ? sizeof(struct virtio_net_hdr_v1) :
+ sizeof(struct virtio_net_hdr);
+ struct virtio_net_config *vio_config = vdpasim->config;
+ struct vdpasim_net *net = sim_to_net(vdpasim);
+
+ if (len < ETH_ALEN + hdr_len)
+ return false;
+
+ if (is_broadcast_ether_addr(net->buffer + hdr_len) ||
+ is_multicast_ether_addr(net->buffer + hdr_len))
+ return true;
+ if (!strncmp(net->buffer + hdr_len, vio_config->mac, ETH_ALEN))
+ return true;
+
+ return false;
+}
+
+static virtio_net_ctrl_ack vdpasim_handle_ctrl_mac(struct vdpasim *vdpasim,
+ u8 cmd)
+{
+ struct virtio_net_config *vio_config = vdpasim->config;
+ struct vdpasim_virtqueue *cvq = &vdpasim->vqs[2];
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ size_t read;
+
+ switch (cmd) {
+ case VIRTIO_NET_CTRL_MAC_ADDR_SET:
+ read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->in_iov,
+ vio_config->mac, ETH_ALEN);
+ if (read == ETH_ALEN)
+ status = VIRTIO_NET_OK;
+ break;
+ default:
+ break;
+ }
+
+ return status;
+}
+
+static void vdpasim_handle_cvq(struct vdpasim *vdpasim)
+{
+ struct vdpasim_virtqueue *cvq = &vdpasim->vqs[2];
+ struct vdpasim_net *net = sim_to_net(vdpasim);
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ struct virtio_net_ctrl_hdr ctrl;
+ size_t read, write;
+ u64 requests = 0, errors = 0, successes = 0;
+ int err;
+
+ if (!(vdpasim->features & (1ULL << VIRTIO_NET_F_CTRL_VQ)))
+ return;
+
+ if (!cvq->ready)
+ return;
+
+ while (true) {
+ err = vringh_getdesc_iotlb(&cvq->vring, &cvq->in_iov,
+ &cvq->out_iov,
+ &cvq->head, GFP_ATOMIC);
+ if (err <= 0)
+ break;
+
+ ++requests;
+ read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->in_iov, &ctrl,
+ sizeof(ctrl));
+ if (read != sizeof(ctrl)) {
+ ++errors;
+ break;
+ }
+
+ switch (ctrl.class) {
+ case VIRTIO_NET_CTRL_MAC:
+ status = vdpasim_handle_ctrl_mac(vdpasim, ctrl.cmd);
+ break;
+ default:
+ break;
+ }
+
+ if (status == VIRTIO_NET_OK)
+ ++successes;
+ else
+ ++errors;
+
+ /* Make sure data is wrote before advancing index */
+ smp_wmb();
+
+ write = vringh_iov_push_iotlb(&cvq->vring, &cvq->out_iov,
+ &status, sizeof(status));
+ vringh_complete_iotlb(&cvq->vring, cvq->head, write);
+ vringh_kiov_cleanup(&cvq->in_iov);
+ vringh_kiov_cleanup(&cvq->out_iov);
+
+ /* Make sure used is visible before rasing the interrupt. */
+ smp_wmb();
+
+ local_bh_disable();
+ if (cvq->cb)
+ cvq->cb(cvq->private);
+ local_bh_enable();
+ }
+
+ u64_stats_update_begin(&net->cq_stats.syncp);
+ net->cq_stats.requests += requests;
+ net->cq_stats.errors += errors;
+ net->cq_stats.successes += successes;
+ u64_stats_update_end(&net->cq_stats.syncp);
+}
+
+static void vdpasim_net_work(struct vdpasim *vdpasim)
+{
+ struct vdpasim_virtqueue *txq = &vdpasim->vqs[1];
+ struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0];
+ struct vdpasim_net *net = sim_to_net(vdpasim);
+ ssize_t read, write;
+ u64 tx_pkts = 0, rx_pkts = 0, tx_bytes = 0, rx_bytes = 0;
+ u64 rx_drops = 0, rx_overruns = 0, rx_errors = 0, tx_errors = 0;
+ int err;
+
+ mutex_lock(&vdpasim->mutex);
+
+ if (!vdpasim->running)
+ goto out;
+
+ if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
+ goto out;
+
+ vdpasim_handle_cvq(vdpasim);
+
+ if (!txq->ready || !rxq->ready)
+ goto out;
+
+ while (true) {
+ err = vringh_getdesc_iotlb(&txq->vring, &txq->out_iov, NULL,
+ &txq->head, GFP_ATOMIC);
+ if (err <= 0) {
+ if (err)
+ ++tx_errors;
+ break;
+ }
+
+ ++tx_pkts;
+ read = vringh_iov_pull_iotlb(&txq->vring, &txq->out_iov,
+ net->buffer, PAGE_SIZE);
+
+ tx_bytes += read;
+
+ if (!receive_filter(vdpasim, read)) {
+ ++rx_drops;
+ vdpasim_net_complete(txq, 0);
+ continue;
+ }
+
+ err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->in_iov,
+ &rxq->head, GFP_ATOMIC);
+ if (err <= 0) {
+ ++rx_overruns;
+ vdpasim_net_complete(txq, 0);
+ break;
+ }
+
+ write = vringh_iov_push_iotlb(&rxq->vring, &rxq->in_iov,
+ net->buffer, read);
+ if (write <= 0) {
+ ++rx_errors;
+ break;
+ }
+
+ ++rx_pkts;
+ rx_bytes += write;
+
+ vdpasim_net_complete(txq, 0);
+ vdpasim_net_complete(rxq, write);
+
+ if (tx_pkts > 4) {
+ vdpasim_schedule_work(vdpasim);
+ goto out;
+ }
+ }
+
+out:
+ mutex_unlock(&vdpasim->mutex);
+
+ u64_stats_update_begin(&net->tx_stats.syncp);
+ net->tx_stats.pkts += tx_pkts;
+ net->tx_stats.bytes += tx_bytes;
+ net->tx_stats.errors += tx_errors;
+ u64_stats_update_end(&net->tx_stats.syncp);
+
+ u64_stats_update_begin(&net->rx_stats.syncp);
+ net->rx_stats.pkts += rx_pkts;
+ net->rx_stats.bytes += rx_bytes;
+ net->rx_stats.drops += rx_drops;
+ net->rx_stats.errors += rx_errors;
+ net->rx_stats.overruns += rx_overruns;
+ u64_stats_update_end(&net->rx_stats.syncp);
+}
+
+static int vdpasim_net_get_stats(struct vdpasim *vdpasim, u16 idx,
+ struct sk_buff *msg,
+ struct netlink_ext_ack *extack)
+{
+ struct vdpasim_net *net = sim_to_net(vdpasim);
+ u64 rx_pkts, rx_bytes, rx_errors, rx_overruns, rx_drops;
+ u64 tx_pkts, tx_bytes, tx_errors, tx_drops;
+ u64 cq_requests, cq_successes, cq_errors;
+ unsigned int start;
+ int err = -EMSGSIZE;
+
+ switch(idx) {
+ case 0:
+ do {
+ start = u64_stats_fetch_begin(&net->rx_stats.syncp);
+ rx_pkts = net->rx_stats.pkts;
+ rx_bytes = net->rx_stats.bytes;
+ rx_errors = net->rx_stats.errors;
+ rx_overruns = net->rx_stats.overruns;
+ rx_drops = net->rx_stats.drops;
+ } while (u64_stats_fetch_retry(&net->rx_stats.syncp, start));
+
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "rx packets"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ rx_pkts, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "rx bytes"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ rx_bytes, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "rx errors"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ rx_errors, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "rx overruns"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ rx_overruns, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "rx drops"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ rx_drops, VDPA_ATTR_PAD))
+ break;
+ err = 0;
+ break;
+ case 1:
+ do {
+ start = u64_stats_fetch_begin(&net->tx_stats.syncp);
+ tx_pkts = net->tx_stats.pkts;
+ tx_bytes = net->tx_stats.bytes;
+ tx_errors = net->tx_stats.errors;
+ tx_drops = net->tx_stats.drops;
+ } while (u64_stats_fetch_retry(&net->tx_stats.syncp, start));
+
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "tx packets"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ tx_pkts, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "tx bytes"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ tx_bytes, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "tx errors"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ tx_errors, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "tx drops"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ tx_drops, VDPA_ATTR_PAD))
+ break;
+ err = 0;
+ break;
+ case 2:
+ do {
+ start = u64_stats_fetch_begin(&net->cq_stats.syncp);
+ cq_requests = net->cq_stats.requests;
+ cq_successes = net->cq_stats.successes;
+ cq_errors = net->cq_stats.errors;
+ } while (u64_stats_fetch_retry(&net->cq_stats.syncp, start));
+
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "cvq requests"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ cq_requests, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "cvq successes"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ cq_successes, VDPA_ATTR_PAD))
+ break;
+ if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME,
+ "cvq errors"))
+ break;
+ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,
+ cq_errors, VDPA_ATTR_PAD))
+ break;
+ err = 0;
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)
+{
+ struct virtio_net_config *net_config = config;
+
+ net_config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);
+}
+
+static void vdpasim_net_setup_config(struct vdpasim *vdpasim,
+ const struct vdpa_dev_set_config *config)
+{
+ struct virtio_net_config *vio_config = vdpasim->config;
+
+ if (config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR))
+ memcpy(vio_config->mac, config->net.mac, ETH_ALEN);
+ if (config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MTU))
+ vio_config->mtu = cpu_to_vdpasim16(vdpasim, config->net.mtu);
+ else
+ /* Setup default MTU to be 1500 */
+ vio_config->mtu = cpu_to_vdpasim16(vdpasim, 1500);
+}
+
+static void vdpasim_net_free(struct vdpasim *vdpasim)
+{
+ struct vdpasim_net *net = sim_to_net(vdpasim);
+
+ kvfree(net->buffer);
+}
+
+static void vdpasim_net_mgmtdev_release(struct device *dev)
+{
+}
+
+static struct device vdpasim_net_mgmtdev = {
+ .init_name = "vdpasim_net",
+ .release = vdpasim_net_mgmtdev_release,
+};
+
+static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
+ const struct vdpa_dev_set_config *config)
+{
+ struct vdpasim_dev_attr dev_attr = {};
+ struct vdpasim_net *net;
+ struct vdpasim *simdev;
+ int ret;
+
+ dev_attr.mgmt_dev = mdev;
+ dev_attr.name = name;
+ dev_attr.id = VIRTIO_ID_NET;
+ dev_attr.supported_features = VDPASIM_NET_FEATURES;
+ dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
+ dev_attr.ngroups = VDPASIM_NET_GROUP_NUM;
+ dev_attr.nas = VDPASIM_NET_AS_NUM;
+ dev_attr.alloc_size = sizeof(struct vdpasim_net);
+ dev_attr.config_size = sizeof(struct virtio_net_config);
+ dev_attr.get_config = vdpasim_net_get_config;
+ dev_attr.work_fn = vdpasim_net_work;
+ dev_attr.get_stats = vdpasim_net_get_stats;
+ dev_attr.free = vdpasim_net_free;
+
+ simdev = vdpasim_create(&dev_attr, config);
+ if (IS_ERR(simdev))
+ return PTR_ERR(simdev);
+
+ vdpasim_net_setup_config(simdev, config);
+
+ net = sim_to_net(simdev);
+
+ u64_stats_init(&net->tx_stats.syncp);
+ u64_stats_init(&net->rx_stats.syncp);
+ u64_stats_init(&net->cq_stats.syncp);
+
+ net->buffer = kvmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!net->buffer) {
+ ret = -ENOMEM;
+ goto reg_err;
+ }
+
+ /*
+ * Initialization must be completed before this call, since it can
+ * connect the device to the vDPA bus, so requests can arrive after
+ * this call.
+ */
+ ret = _vdpa_register_device(&simdev->vdpa, VDPASIM_NET_VQ_NUM);
+ if (ret)
+ goto reg_err;
+
+ return 0;
+
+reg_err:
+ put_device(&simdev->vdpa.dev);
+ return ret;
+}
+
+static void vdpasim_net_dev_del(struct vdpa_mgmt_dev *mdev,
+ struct vdpa_device *dev)
+{
+ struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
+
+ _vdpa_unregister_device(&simdev->vdpa);
+}
+
+static const struct vdpa_mgmtdev_ops vdpasim_net_mgmtdev_ops = {
+ .dev_add = vdpasim_net_dev_add,
+ .dev_del = vdpasim_net_dev_del
+};
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct vdpa_mgmt_dev mgmt_dev = {
+ .device = &vdpasim_net_mgmtdev,
+ .id_table = id_table,
+ .ops = &vdpasim_net_mgmtdev_ops,
+ .config_attr_mask = (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR |
+ 1 << VDPA_ATTR_DEV_NET_CFG_MTU |
+ 1 << VDPA_ATTR_DEV_FEATURES),
+ .max_supported_vqs = VDPASIM_NET_VQ_NUM,
+ .supported_features = VDPASIM_NET_FEATURES,
+};
+
+static int __init vdpasim_net_init(void)
+{
+ int ret;
+
+ ret = device_register(&vdpasim_net_mgmtdev);
+ if (ret) {
+ put_device(&vdpasim_net_mgmtdev);
+ return ret;
+ }
+
+ ret = vdpa_mgmtdev_register(&mgmt_dev);
+ if (ret)
+ goto parent_err;
+ return 0;
+
+parent_err:
+ device_unregister(&vdpasim_net_mgmtdev);
+ return ret;
+}
+
+static void __exit vdpasim_net_exit(void)
+{
+ vdpa_mgmtdev_unregister(&mgmt_dev);
+ device_unregister(&vdpasim_net_mgmtdev);
+}
+
+module_init(vdpasim_net_init);
+module_exit(vdpasim_net_exit);
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE(DRV_LICENSE);
+MODULE_AUTHOR(DRV_AUTHOR);
+MODULE_DESCRIPTION(DRV_DESC);