[dpdk-dev] [PATCH v5 03/15] vhost: vring address setup for packed queues

[Maxime Coquelin]

From: Yuanhan Liu <yuanhan.liu at linux.intel.com>

Add code to set up packed queues when enabled.

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
Signed-off-by: Jens Freimann <jfreiman at redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/vhost.c      | 44 ++++++++++++++++++++++++++++++++++++++-----
 lib/librte_vhost/vhost.h      |  7 ++++++-
 lib/librte_vhost/vhost_user.c | 29 +++++++++++++++++++++++++++-
 3 files changed, 73 insertions(+), 7 deletions(-)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index afded4952..a85c6646f 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -23,6 +23,7 @@
 #include "iotlb.h"
 #include "vhost.h"
 #include "vhost_user.h"
+#include "virtio-packed.h"
 
 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
 
@@ -115,14 +116,11 @@ free_device(struct virtio_net *dev)
 	rte_free(dev);
 }
 
-int
-vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
+static int
+vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 {
 	uint64_t req_size, size;
 
-	if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
-		goto out;
-
 	req_size = sizeof(struct vring_desc) * vq->size;
 	size = req_size;
 	vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
@@ -153,6 +151,40 @@ vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 	if (!vq->used || size != req_size)
 		return -1;
 
+	return 0;
+}
+
+static int
+vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+	uint64_t req_size, size;
+
+	req_size = sizeof(struct vring_desc_packed) * vq->size;
+	size = req_size;
+	vq->desc_packed =
+		(struct vring_desc_packed *)(uintptr_t)vhost_iova_to_vva(dev,
+					vq, vq->ring_addrs.desc_user_addr,
+					&size, VHOST_ACCESS_RW);
+	if (!vq->desc || size != req_size)
+		return -1;
+
+	return 0;
+}
+
+int
+vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+
+	if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
+		goto out;
+
+	if (vq_is_packed(dev)) {
+		if (vring_translate_packed(dev, vq) < 0)
+			return -1;
+	} else {
+		if (vring_translate_split(dev, vq) < 0)
+			return -1;
+	}
 out:
 	vq->access_ok = 1;
 
@@ -234,6 +266,8 @@ alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 	dev->virtqueue[vring_idx] = vq;
 	init_vring_queue(dev, vring_idx);
 	rte_spinlock_init(&vq->access_lock);
+	vq->avail_wrap_counter = 1;
+	vq->used_wrap_counter = 1;
 
 	dev->nr_vring += 1;
 
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 34a614c97..671b4b3bf 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -84,7 +84,10 @@ struct log_cache_entry {
  * Structure contains variables relevant to RX/TX virtqueues.
  */
 struct vhost_virtqueue {
-	struct vring_desc	*desc;
+	union {
+		struct vring_desc	*desc;
+		struct vring_desc_packed   *desc_packed;
+	};
 	struct vring_avail	*avail;
 	struct vring_used	*used;
 	uint32_t		size;
@@ -122,6 +125,8 @@ struct vhost_virtqueue {
 
 	struct batch_copy_elem	*batch_copy_elems;
 	uint16_t		batch_copy_nb_elems;
+	uint16_t		used_wrap_counter;
+	uint16_t		avail_wrap_counter;
 
 	struct log_cache_entry log_cache[VHOST_LOG_CACHE_NR];
 	uint16_t log_cache_nb_elem;
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 947290fc3..b6097c085 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -39,6 +39,7 @@
 #include "iotlb.h"
 #include "vhost.h"
 #include "vhost_user.h"
+#include "virtio-packed.h"
 
 #define VIRTIO_MIN_MTU 68
 #define VIRTIO_MAX_MTU 65535
@@ -477,6 +478,30 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 	struct vhost_vring_addr *addr = &vq->ring_addrs;
 	uint64_t len;
 
+	if (vq_is_packed(dev)) {
+		len = sizeof(struct vring_desc_packed) * vq->size;
+		vq->desc_packed = (struct vring_desc_packed *) ring_addr_to_vva
+			(dev, vq, addr->desc_user_addr, &len);
+		vq->desc = NULL;
+		vq->avail = NULL;
+		vq->used = NULL;
+		vq->log_guest_addr = 0;
+		if (vq->desc_packed == 0 ||
+				len != sizeof(struct vring_desc_packed) *
+				vq->size) {
+			RTE_LOG(DEBUG, VHOST_CONFIG,
+				"(%d) failed to map desc_packed ring.\n",
+				dev->vid);
+			return dev;
+		}
+
+		dev = numa_realloc(dev, vq_index);
+		vq = dev->virtqueue[vq_index];
+		addr = &vq->ring_addrs;
+
+		return dev;
+	}
+
 	/* The addresses are converted from QEMU virtual to Vhost virtual. */
 	if (vq->desc && vq->avail && vq->used)
 		return dev;
@@ -490,6 +515,7 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 			dev->vid);
 		return dev;
 	}
+	vq->desc_packed = NULL;
 
 	dev = numa_realloc(dev, vq_index);
 	vq = dev->virtqueue[vq_index];
@@ -888,7 +914,8 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 static int
 vq_is_ready(struct vhost_virtqueue *vq)
 {
-	return vq && vq->desc && vq->avail && vq->used &&
+	return vq &&
+	       (vq->desc_packed || (vq->desc && vq->avail && vq->used)) &&
 	       vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 	       vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 }
-- 
2.14.4