diff mbox series

[2/4] net/virtio-user: fix the control vq support

Message ID 20190122170143.5650-3-tiwei.bie@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Maxime Coquelin
Headers
Series Virtio fixes |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Tiwei Bie Jan. 22, 2019, 5:01 p.m. UTC 
  This patch fixed below issues in the packed ring based control
vq support in virtio user:

1. The idx_hdr should be used_idx instead of the id in the desc;
2. We just need to write out a single used descriptor for each
   descriptor list;
3. The avail/used bits should be initialized to 0;

Meanwhile, make the function name consistent with other parts.

Fixes: 48a4464029a7 ("net/virtio-user: support control VQ for packed")

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c            | 11 ++++++
 .../net/virtio/virtio_user/virtio_user_dev.c  | 37 +++++++++++--------
 drivers/net/virtio/virtio_user_ethdev.c       |  7 +---
 3 files changed, 34 insertions(+), 21 deletions(-)

Comments

Maxime Coquelin Jan. 23, 2019, 10:07 p.m. UTC | #1 
On 1/22/19 6:01 PM, Tiwei Bie wrote:
> This patch fixed below issues in the packed ring based control
> vq support in virtio user:
> 
> 1. The idx_hdr should be used_idx instead of the id in the desc;
> 2. We just need to write out a single used descriptor for each
>     descriptor list;
> 3. The avail/used bits should be initialized to 0;
> 
> Meanwhile, make the function name consistent with other parts.
> 
> Fixes: 48a4464029a7 ("net/virtio-user: support control VQ for packed")
> 
> Signed-off-by: Tiwei Bie<tiwei.bie@intel.com>
> ---
>   drivers/net/virtio/virtio_ethdev.c            | 11 ++++++
>   .../net/virtio/virtio_user/virtio_user_dev.c  | 37 +++++++++++--------
>   drivers/net/virtio/virtio_user_ethdev.c       |  7 +---
>   3 files changed, 34 insertions(+), 21 deletions(-)

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
diff mbox series

Patch

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index a3fe65599..7c4c1df00 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -224,6 +224,17 @@  virtio_send_command_packed(struct virtnet_ctl *cvq,
 		vq->used_wrap_counter ^= 1;
 	}
 
+	PMD_INIT_LOG(DEBUG, "vq->vq_free_cnt=%d\n"
+			"vq->vq_avail_idx=%d\n"
+			"vq->vq_used_cons_idx=%d\n"
+			"vq->avail_wrap_counter=%d\n"
+			"vq->used_wrap_counter=%d\n",
+			vq->vq_free_cnt,
+			vq->vq_avail_idx,
+			vq->vq_used_cons_idx,
+			vq->avail_wrap_counter,
+			vq->used_wrap_counter);
+
 	result = cvq->virtio_net_hdr_mz->addr;
 	return result;
 }
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index c1919177d..89d287a74 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -632,9 +632,9 @@  desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
 }
 
 static uint32_t
-virtio_user_handle_ctrl_msg_pq(struct virtio_user_dev *dev,
-			    struct vring_packed *vring,
-			    uint16_t idx_hdr)
+virtio_user_handle_ctrl_msg_packed(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;
@@ -671,6 +671,10 @@  virtio_user_handle_ctrl_msg_pq(struct virtio_user_dev *dev,
 	*(virtio_net_ctrl_ack *)(uintptr_t)
 		vring->desc_packed[idx_status].addr = status;
 
+	/* Update used descriptor */
+	vring->desc_packed[idx_hdr].id = vring->desc_packed[idx_status].id;
+	vring->desc_packed[idx_hdr].len = sizeof(status);
+
 	return n_descs;
 }
 
@@ -679,24 +683,25 @@  virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
 {
 	struct virtio_user_queue *vq = &dev->packed_queues[queue_idx];
 	struct vring_packed *vring = &dev->packed_vrings[queue_idx];
-	uint16_t id, n_descs;
+	uint16_t n_descs;
 
 	while (desc_is_avail(&vring->desc_packed[vq->used_idx],
 			     vq->used_wrap_counter)) {
-		id = vring->desc_packed[vq->used_idx].id;
 
-		n_descs = virtio_user_handle_ctrl_msg_pq(dev, vring, id);
+		n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring,
+				vq->used_idx);
 
-		do {
-			vring->desc_packed[vq->used_idx].flags =
-				VRING_DESC_F_AVAIL(vq->used_wrap_counter) |
-				VRING_DESC_F_USED(vq->used_wrap_counter);
-			if (++vq->used_idx >= dev->queue_size) {
-				vq->used_idx -= dev->queue_size;
-				vq->used_wrap_counter ^= 1;
-			}
-			n_descs--;
-		} while (n_descs);
+		rte_smp_wmb();
+		vring->desc_packed[vq->used_idx].flags =
+			VRING_DESC_F_WRITE |
+			VRING_DESC_F_AVAIL(vq->used_wrap_counter) |
+			VRING_DESC_F_USED(vq->used_wrap_counter);
+
+		vq->used_idx += n_descs;
+		if (vq->used_idx >= dev->queue_size) {
+			vq->used_idx -= dev->queue_size;
+			vq->used_wrap_counter ^= 1;
+		}
 	}
 }
 
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index c01f45cab..6423e1f61 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -274,7 +274,6 @@  virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
 static void
 virtio_user_setup_queue_packed(struct virtqueue *vq,
 			       struct virtio_user_dev *dev)
-
 {
 	uint16_t queue_idx = vq->vq_queue_index;
 	struct vring_packed *vring;
@@ -300,10 +299,8 @@  virtio_user_setup_queue_packed(struct virtqueue *vq,
 	dev->packed_queues[queue_idx].avail_wrap_counter = true;
 	dev->packed_queues[queue_idx].used_wrap_counter = true;
 
-	for (i = 0; i < vring->num; i++) {
-		vring->desc_packed[i].flags = VRING_DESC_F_USED(1) |
-					      VRING_DESC_F_AVAIL(1);
-	}
+	for (i = 0; i < vring->num; i++)
+		vring->desc_packed[i].flags = 0;
 }
 
 static void