On 1/10/19 2:17 PM, Jens Freimann wrote:
Add support to virtio-user for control virtqueues.
Signed-off-by: Jens Freimann <jfreim...@redhat.com>
---
.../net/virtio/virtio_user/virtio_user_dev.c | 92 ++++++++++++++++++-
.../net/virtio/virtio_user/virtio_user_dev.h | 8 +-
drivers/net/virtio/virtio_user_ethdev.c | 49 +++++++++-
3 files changed, 141 insertions(+), 8 deletions(-)
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index b9044faff..49fcf48b9 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -43,15 +43,26 @@ virtio_user_kick_queue(struct virtio_user_dev *dev,
uint32_t queue_sel)
struct vhost_vring_file file;
struct vhost_vring_state state;
struct vring *vring = &dev->vrings[queue_sel];
+ struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel];
struct vhost_vring_addr addr = {
.index = queue_sel,
- .desc_user_addr = (uint64_t)(uintptr_t)vring->desc,
- .avail_user_addr = (uint64_t)(uintptr_t)vring->avail,
- .used_user_addr = (uint64_t)(uintptr_t)vring->used,
.log_guest_addr = 0,
.flags = 0, /* disable log */
};
+ if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
+ addr.desc_user_addr =
+ (uint64_t)(uintptr_t)pq_vring->desc_packed;
+ addr.avail_user_addr =
+ (uint64_t)(uintptr_t)pq_vring->driver_event;
+ addr.used_user_addr =
+ (uint64_t)(uintptr_t)pq_vring->device_event;
+ } else {
+ addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc;
+ addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail;
+ addr.used_user_addr = (uint64_t)(uintptr_t)vring->used;
+ }
+
state.index = queue_sel;
state.num = vring->num;
dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
@@ -620,6 +631,81 @@ virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev,
struct vring *vring,
return n_descs;
}
+static inline int
+desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
+{
+ return wrap_counter == !!(desc->flags & VRING_DESC_F_AVAIL(1)) &&
+ wrap_counter != !!(desc->flags & VRING_DESC_F_USED(1));
+}
+
+static uint32_t
+virtio_user_handle_ctrl_msg_pq(struct virtio_user_dev *dev,
+ struct vring_packed *vring,
+ uint16_t idx_hdr)
+{
+ struct virtio_net_ctrl_hdr *hdr;
+ virtio_net_ctrl_ack status = ~0;
+ uint16_t idx_data, idx_status;
+ /* initialize to one, header is first */
+ uint32_t n_descs = 1;
+
+ /* locate desc for header, data, and status */
+ idx_data = idx_hdr + 1;
+ n_descs++;
+
+ idx_status = idx_data;
+ while (vring->desc_packed[idx_status].flags & VRING_DESC_F_NEXT) {
+ idx_status++;
+ n_descs++;
+ }
+
+ hdr = (void *)(uintptr_t)vring->desc_packed[idx_hdr].addr;
+ if (hdr->class == VIRTIO_NET_CTRL_MQ &&
+ hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
+ uint16_t queues;
+
+ queues = *(uint16_t *)(uintptr_t)
+ vring->desc_packed[idx_data].addr;
+ status = virtio_user_handle_mq(dev, queues);
+ }
+
+ /* Update status */
+ *(virtio_net_ctrl_ack *)(uintptr_t)
+ vring->desc_packed[idx_status].addr = status;
+
+ return n_descs;
+}
+
+void
+virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx,
+ struct virtqueue *vq)
+{
+ struct vring_packed *vring = &dev->packed_vrings[queue_idx];
+ uint16_t id, n_descs;
+ int16_t n;
+
+ while (desc_is_avail(&vring->desc_packed[vq->vq_used_cons_idx],
+ vq->avail_wrap_counter)) {
+ id = vring->desc_packed[vq->vq_used_cons_idx].id;
+
+ n_descs = virtio_user_handle_ctrl_msg_pq(dev, vring, id);
+
+ vring->desc_packed[vq->vq_used_cons_idx].len = n_descs;
+ vring->desc_packed[vq->vq_used_cons_idx].id =
+ vq->vq_used_cons_idx;
Are the above assignments necessary? I don't think so.
+ n = vq->vq_used_cons_idx + n_descs - 1;
+ do {
+ vring->desc_packed[vq->vq_used_cons_idx].flags |=
+ VRING_DESC_F_AVAIL(vq->used_wrap_counter) |
+ VRING_DESC_F_USED(vq->used_wrap_counter);
+ if (vq->vq_used_cons_idx >= dev->queue_size) {
+ vq->vq_used_cons_idx -= dev->queue_size;
+ vq->used_wrap_counter ^= 1;
+ }
+ } while (++vq->vq_used_cons_idx <= n);
I think it still does not work.
In case of wrap, n will be greater than queue size.
But as vq->vq_used_cons_idx wraps, I guess there will be an endless
loop.
+ }
+}
+
void
virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
{
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
b/drivers/net/virtio/virtio_user/virtio_user_dev.h
index 672a8161a..8be8ca622 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
@@ -39,7 +39,11 @@ struct virtio_user_dev {
uint16_t port_id;
uint8_t mac_addr[ETHER_ADDR_LEN];
char path[PATH_MAX];
- struct vring vrings[VIRTIO_MAX_VIRTQUEUES];
+ union {
+ struct vring vrings[VIRTIO_MAX_VIRTQUEUES];
+ struct vring_packed packed_vrings[VIRTIO_MAX_VIRTQUEUES];
+ };
+
struct virtio_user_backend_ops *ops;
pthread_mutex_t mutex;
bool started;
@@ -53,5 +57,7 @@ int virtio_user_dev_init(struct virtio_user_dev *dev, char
*path, int queues,
int mrg_rxbuf, int in_order, int packed_vq);
void virtio_user_dev_uninit(struct virtio_user_dev *dev);
void virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx);
+void virtio_user_handle_cq_packed(struct virtio_user_dev *dev,
+ uint16_t queue_idx, struct virtqueue *vq);
uint8_t virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs);
#endif
diff --git a/drivers/net/virtio/virtio_user_ethdev.c
b/drivers/net/virtio/virtio_user_ethdev.c
index 2df6eb695..efc375cd7 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -271,10 +271,36 @@ virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t
queue_id __rte_unused)
return dev->queue_size;
}
-static int
-virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
+static void
+virtio_user_setup_queue_packed(struct virtqueue *vq,
+ struct virtio_user_dev *dev)
+
+{
+ uint16_t queue_idx = vq->vq_queue_index;
+ uint64_t desc_addr;
+ uint64_t avail_addr;
+ uint64_t used_addr;
+
+ desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
+ avail_addr = desc_addr + vq->vq_nentries *
+ sizeof(struct vring_packed_desc);
+ used_addr = RTE_ALIGN_CEIL(avail_addr +
+ sizeof(struct vring_packed_desc_event),
+ VIRTIO_PCI_VRING_ALIGN);
+ dev->packed_vrings[queue_idx].num = vq->vq_nentries;
+ dev->packed_vrings[queue_idx].desc_packed =
+ (void *)(uintptr_t)desc_addr;
+ dev->packed_vrings[queue_idx].driver_event =
+ (void *)(uintptr_t)avail_addr;
+ dev->packed_vrings[queue_idx].device_event =
+ (void *)(uintptr_t)used_addr;
+ vq->avail_wrap_counter = true;
+ vq->used_wrap_counter = true;
+}
+
+static void
+virtio_user_setup_queue_split(struct virtqueue *vq, struct virtio_user_dev
*dev)
{
- struct virtio_user_dev *dev = virtio_user_get_dev(hw);
uint16_t queue_idx = vq->vq_queue_index;
uint64_t desc_addr, avail_addr, used_addr;
@@ -288,6 +314,17 @@ virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
+}
+
+static int
+virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ if (vtpci_packed_queue(hw))
+ virtio_user_setup_queue_packed(vq, dev);
+ else
+ virtio_user_setup_queue_split(vq, dev);
return 0;
}
@@ -317,7 +354,11 @@ virtio_user_notify_queue(struct virtio_hw *hw, struct
virtqueue *vq)
struct virtio_user_dev *dev = virtio_user_get_dev(hw);
if (hw->cvq && (hw->cvq->vq == vq)) {
- virtio_user_handle_cq(dev, vq->vq_queue_index);
+ if (vtpci_packed_queue(vq->hw))
+ virtio_user_handle_cq_packed(dev, vq->vq_queue_index,
+ vq);
+ else
+ virtio_user_handle_cq(dev, vq->vq_queue_index);
return;
}
