On Thu, Oct 25, 2018 at 05:21:15PM +0800, Tiwei Bie wrote:
On Wed, Oct 24, 2018 at 04:32:29PM +0200, Jens Freimann wrote:
Add and initialize descriptor data structures.
Signed-off-by: Jens Freimann <jfreim...@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 18 ++++----
drivers/net/virtio/virtio_pci.h | 7 +++
drivers/net/virtio/virtio_ring.h | 74 ++++++++++++++++++++++++++----
drivers/net/virtio/virtqueue.h | 15 +++++-
4 files changed, 95 insertions(+), 19 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c
b/drivers/net/virtio/virtio_ethdev.c
index 730c41707..6130aef16 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -299,19 +299,21 @@ virtio_init_vring(struct virtqueue *vq)
PMD_INIT_FUNC_TRACE();
- /*
- * Reinitialise since virtio port might have been stopped and restarted
- */
Why above comments are removed?
by mistake, I'll put them back in next version.
memset(ring_mem, 0, vq->vq_ring_size);
- vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+ vring_init(vq->hw, vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+
vq->vq_used_cons_idx = 0;
vq->vq_desc_head_idx = 0;
vq->vq_avail_idx = 0;
vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
vq->vq_free_cnt = vq->vq_nentries;
memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
-
- vring_desc_init(vr->desc, size);
+ if (vtpci_packed_queue(vq->hw)) {
+ if (!vtpci_with_feature(vq->hw, VIRTIO_F_IN_ORDER))
+ vring_desc_init_packed(vq, size);
Don't we need to initialize descs in IN-ORDER case?
Yes, I missed this here. I'll fix it.
+ } else {
+ vring_desc_init_split(vr->desc, size);
+ }
/*
* Disable device(host) interrupting guest
@@ -386,7 +388,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
vtpci_queue_idx)
/*
* Reserve a memzone for vring elements
*/
- size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
+ size = vring_size(hw, vq_size, VIRTIO_PCI_VRING_ALIGN);
vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d",
size, vq->vq_ring_size);
@@ -489,7 +491,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
vtpci_queue_idx)
for (i = 0; i < vq_size; i++) {
struct vring_desc *start_dp = txr[i].tx_indir;
- vring_desc_init(start_dp, RTE_DIM(txr[i].tx_indir));
+ vring_desc_init_split(start_dp,
RTE_DIM(txr[i].tx_indir));
/* first indirect descriptor is always the tx header */
start_dp->addr = txvq->virtio_net_hdr_mem
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 58fdd3d45..c487d2be0 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -113,6 +113,7 @@ struct virtnet_ctl;
#define VIRTIO_F_VERSION_1 32
#define VIRTIO_F_IOMMU_PLATFORM 33
+#define VIRTIO_F_RING_PACKED 34
/*
* Some VirtIO feature bits (currently bits 28 through 31) are
@@ -314,6 +315,12 @@ vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
return (hw->guest_features & (1ULL << bit)) != 0;
}
+static inline int
+vtpci_packed_queue(struct virtio_hw *hw)
+{
+ return vtpci_with_feature(hw, VIRTIO_F_RING_PACKED);
+}
+
/*
* Function declaration from virtio_pci.c
*/
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index 9e3c2a015..e65da100b 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -54,11 +54,38 @@ struct vring_used {
struct vring_used_elem ring[0];
};
+/* For support of packed virtqueues in Virtio 1.1 the format of descriptors
+ * looks like this.
+ */
+struct vring_desc_packed {
+ uint64_t addr;
+ uint32_t len;
+ uint16_t index;
s/index/id/
ok
+ uint16_t flags;
+} __attribute__ ((aligned(16)));
We don't need the "__attribute__ ((aligned(16)))" in descriptor
structure's definition.
Someone requested this in an earlier round of reviews, but I'll
check again.
+
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
Please add an empty line here.
ok
+struct vring_packed_desc_event {
+ uint16_t desc_event_off_wrap;
+ uint16_t desc_event_flags;
+};
+
struct vring {
unsigned int num;
- struct vring_desc *desc;
- struct vring_avail *avail;
- struct vring_used *used;
+ union {
+ struct vring_desc_packed *desc_packed;
+ struct vring_desc *desc;
+ };
+ union {
+ struct vring_avail *avail;
+ struct vring_packed_desc_event *driver_event;
+ };
+ union {
+ struct vring_used *used;
+ struct vring_packed_desc_event *device_event;
+ };
};
We should define a new `vring` structure for packed ring.
I think it was requested to have it as a union before, but I can do
it.
Thanks for your review!
regards,
Jens
Thanks
