[dpdk-dev] [RFC 01/29] net/virtio: vring init for 1.1

[Tiwei Bie <tiwei.bie@intel.com>]

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

Add and initialize descriptor data structures.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
[rename desc_1_1 to vring_desc_1_1, refactor desc init code]
Signed-off-by: Jens Freimann <jfreiman@redhat.com>
---
 drivers/net/virtio/virtio-1.1.h    | 19 +++++++++++++++++++
 drivers/net/virtio/virtio_ethdev.c | 22 ++++++++++++----------
 drivers/net/virtio/virtio_pci.h    |  7 +++++++
 drivers/net/virtio/virtio_ring.h   | 15 +++++++++++++--
 drivers/net/virtio/virtqueue.h     | 10 ++++++++++
 5 files changed, 61 insertions(+), 12 deletions(-)
 create mode 100644 drivers/net/virtio/virtio-1.1.h

diff --git a/drivers/net/virtio/virtio-1.1.h b/drivers/net/virtio/virtio-1.1.h
new file mode 100644
index 0000000..48cbb18
--- /dev/null
+++ b/drivers/net/virtio/virtio-1.1.h
@@ -0,0 +1,19 @@
+#ifndef __VIRTIO_1_1_H
+#define __VIRTIO_1_1_H
+
+#define VRING_DESC_F_NEXT	1
+#define VRING_DESC_F_WRITE	2
+#define VRING_DESC_F_INDIRECT	4
+
+#define BATCH_NOT_FIRST 0x0010
+#define BATCH_NOT_LAST  0x0020
+#define DESC_HW		0x0080
+
+struct vring_desc_1_1 {
+        uint64_t addr;
+        uint32_t len;
+        uint16_t index;
+        uint16_t flags;
+};
+
+#endif /* __VIRTIO_1_1_H */
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 66c28ac..7c4799a 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -320,19 +320,21 @@ virtio_init_vring(struct virtqueue *vq)
 
 	PMD_INIT_FUNC_TRACE();
 
-	/*
-	 * Reinitialise since virtio port might have been stopped and restarted
-	 */
 	memset(ring_mem, 0, vq->vq_ring_size);
-	vring_init(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);
+	vring_init(vq->hw, vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+
 	vq->vq_free_cnt = vq->vq_nentries;
 	memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
+	vq->vq_used_cons_idx = 0;
+	vq->vq_avail_idx     = 0;
+	if (vtpci_version_1_1(vq->hw)) {
+		vring_desc_init_1_1(vr, size);
+	} else {
+		vq->vq_desc_head_idx = 0;
+		vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
 
-	vring_desc_init(vr->desc, size);
+		vring_desc_init(vr->desc, size);
+	}
 
 	/*
 	 * Disable device(host) interrupting guest
@@ -407,7 +409,7 @@ 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);
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 18caebd..ec74009 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -140,6 +140,7 @@ struct virtnet_ctl;
 
 #define VIRTIO_F_VERSION_1		32
 #define VIRTIO_F_IOMMU_PLATFORM	33
+#define VIRTIO_F_VERSION_1_1		34
 
 /*
  * Some VirtIO feature bits (currently bits 28 through 31) are
@@ -318,6 +319,12 @@ vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
 	return (hw->guest_features & (1ULL << bit)) != 0;
 }
 
+static inline int
+vtpci_version_1_1(struct virtio_hw *hw)
+{
+	return vtpci_with_feature(hw, VIRTIO_F_VERSION_1_1);
+}
+
 /*
  * Function declaration from virtio_pci.c
  */
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index fcecc16..a991092 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -38,6 +38,8 @@
 
 #include <rte_common.h>
 
+#include "virtio-1.1.h"
+
 /* This marks a buffer as continuing via the next field. */
 #define VRING_DESC_F_NEXT       1
 /* This marks a buffer as write-only (otherwise read-only). */
@@ -88,6 +90,7 @@ struct vring {
 	struct vring_desc  *desc;
 	struct vring_avail *avail;
 	struct vring_used  *used;
+	struct vring_desc_1_1 *desc_1_1;
 };
 
 /* The standard layout for the ring is a continuous chunk of memory which
@@ -124,10 +127,13 @@ struct vring {
 #define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
 
 static inline size_t
-vring_size(unsigned int num, unsigned long align)
+vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align)
 {
 	size_t size;
 
+	if (vtpci_version_1_1(hw))
+		return num * sizeof(struct vring_desc_1_1);
+
 	size = num * sizeof(struct vring_desc);
 	size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
 	size = RTE_ALIGN_CEIL(size, align);
@@ -137,10 +143,15 @@ vring_size(unsigned int num, unsigned long align)
 }
 
 static inline void
-vring_init(struct vring *vr, unsigned int num, uint8_t *p,
+vring_init(struct virtio_hw *hw, struct vring *vr, unsigned int num, uint8_t *p,
 	unsigned long align)
 {
 	vr->num = num;
+	if (vtpci_version_1_1(hw)) {
+		vr->desc_1_1 = (struct vring_desc_1_1 *)p;
+		return;
+	}
+
 	vr->desc = (struct vring_desc *) p;
 	vr->avail = (struct vring_avail *) (p +
 		num * sizeof(struct vring_desc));
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 2e12086..91d2db7 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -266,6 +266,16 @@ struct virtio_tx_region {
 			   __attribute__((__aligned__(16)));
 };
 
+static inline void
+vring_desc_init_1_1(struct vring *vr, int n)
+{
+	int i;
+	for (i = 0; i < n; i++) {
+		struct vring_desc_1_1 *desc = &vr->desc_1_1[i];
+		desc->index = i;
+	}
+}
+
 /* Chain all the descriptors in the ring with an END */
 static inline void
 vring_desc_init(struct vring_desc *dp, uint16_t n)
-- 
2.7.4