[v5,01/11] net/virtio: vring init for packed queues
diff mbox series

Message ID 20180906181947.20646-2-jfreimann@redhat.com
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series
  • implement packed virtqueues
Related show

Checks

Context Check Description
ci/Intel-compilation success Compilation OK

Commit Message

Jens Freimann Sept. 6, 2018, 6:19 p.m. UTC
Add and initialize descriptor data structures.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
 drivers/net/virtio/virtio_ethdev.c | 22 ++++++------
 drivers/net/virtio/virtio_pci.h    |  8 +++++
 drivers/net/virtio/virtio_ring.h   | 55 +++++++++++++++++++++++++++---
 drivers/net/virtio/virtqueue.h     | 10 ++++++
 4 files changed, 80 insertions(+), 15 deletions(-)

Comments

Gavin Hu Sept. 10, 2018, 5:48 a.m. UTC | #1
> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Jens Freimann
> Sent: Friday, September 7, 2018 2:20 AM
> To: dev@dpdk.org
> Cc: tiwei.bie@intel.com; maxime.coquelin@redhat.com
> Subject: [dpdk-dev] [PATCH v5 01/11] net/virtio: vring init for packed queues
>
> Add and initialize descriptor data structures.
>
> Signed-off-by: Jens Freimann <jfreimann@redhat.com>
> ---
>  drivers/net/virtio/virtio_ethdev.c | 22 ++++++------
>  drivers/net/virtio/virtio_pci.h    |  8 +++++
>  drivers/net/virtio/virtio_ring.h   | 55 +++++++++++++++++++++++++++---
>  drivers/net/virtio/virtqueue.h     | 10 ++++++
>  4 files changed, 80 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/virtio/virtio_ethdev.c
> b/drivers/net/virtio/virtio_ethdev.c
> index 614357da7..ad91f7f82 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
> - */
>  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_packed_queue(vq->hw)) {
> +vring_desc_init_packed(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 @@ -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);
> diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
> index 58fdd3d45..90204d281 100644
> --- a/drivers/net/virtio/virtio_pci.h
> +++ b/drivers/net/virtio/virtio_pci.h
> @@ -113,6 +113,8 @@ struct virtnet_ctl;
>
>  #define VIRTIO_F_VERSION_132
>  #define VIRTIO_F_IOMMU_PLATFORM33
> +#define VIRTIO_F_RING_PACKED34
> +#define VIRTIO_F_IN_ORDER35
>
>  /*
>   * Some VirtIO feature bits (currently bits 28 through 31) are @@ -314,6
> +316,12 @@ 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..cea4d441e 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;

Should be __le64 here, according to spec. same as follows.

> +uint32_t len;
> +uint16_t index;
> +uint16_t flags;
> +};

Should have __attribute__ ((aligned(16))) for alignment according to the spec? Not sure if it automatically aligned at 16bytes boundary.

> +#define RING_EVENT_FLAGS_ENABLE 0x0
> +#define RING_EVENT_FLAGS_DISABLE 0x1
> +#define RING_EVENT_FLAGS_DESC 0x2
> +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;
> +};
>  };
>
>  /* The standard layout for the ring is a continuous chunk of memory which
> @@ -95,10 +122,18 @@ 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_packed_queue(hw)) {
> +size = num * sizeof(struct vring_desc_packed);
> +size += sizeof(struct vring_packed_desc_event);
> +size = RTE_ALIGN_CEIL(size, align);
> +size += sizeof(struct vring_packed_desc_event);
> +return size;
> +}
> +
>  size = num * sizeof(struct vring_desc);
>  size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
>  size = RTE_ALIGN_CEIL(size, align);
> @@ -108,10 +143,20 @@ 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_packed_queue(hw)) {
> +vr->desc_packed = (struct vring_desc_packed *)p;
> +vr->driver_event = (struct vring_packed_desc_event *)(p +
> +num * sizeof(struct vring_desc_packed));
> +vr->device_event = (struct vring_packed_desc_event *)
> +RTE_ALIGN_CEIL((uintptr_t)(vr-
> >driver_event +
> +sizeof(struct vring_packed_desc_event)),
> align);
> +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 26518ed98..d2a0b651a 100644
> --- a/drivers/net/virtio/virtqueue.h
> +++ b/drivers/net/virtio/virtqueue.h
> @@ -245,6 +245,16 @@ struct virtio_tx_region {
>     __attribute__((__aligned__(16)));  };
>
> +static inline void
> +vring_desc_init_packed(struct vring *vr, int n) {
> +int i;
> +for (i = 0; i < n; i++) {
> +struct vring_desc_packed *desc = &vr->desc_packed[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)
> --
> 2.17.1

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Maxime Coquelin Sept. 12, 2018, 8:02 a.m. UTC | #2
On 09/06/2018 08:19 PM, Jens Freimann wrote:
>   	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_packed_queue(vq->hw)) {
> +		vring_desc_init_packed(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);
> +	}

Maybe worth renaming to vring_desc_init_split() for consistency.

Maxime
Jens Freimann Sept. 12, 2018, 9:04 a.m. UTC | #3
On Wed, Sep 12, 2018 at 10:02:30AM +0200, Maxime Coquelin wrote:
>
>
>On 09/06/2018 08:19 PM, Jens Freimann wrote:
>>  	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_packed_queue(vq->hw)) {
>>+		vring_desc_init_packed(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);
>>+	}
>
>Maybe worth renaming to vring_desc_init_split() for consistency.

yes, I'll rename it.

regards,
Jens

Patch
diff mbox series

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 614357da7..ad91f7f82 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
-	 */
 	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_packed_queue(vq->hw)) {
+		vring_desc_init_packed(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
@@ -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);
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 58fdd3d45..90204d281 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -113,6 +113,8 @@  struct virtnet_ctl;
 
 #define VIRTIO_F_VERSION_1		32
 #define VIRTIO_F_IOMMU_PLATFORM	33
+#define VIRTIO_F_RING_PACKED		34
+#define VIRTIO_F_IN_ORDER		35
 
 /*
  * Some VirtIO feature bits (currently bits 28 through 31) are
@@ -314,6 +316,12 @@  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..cea4d441e 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;
+	uint16_t flags;
+};
+
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
+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;
+	};
 };
 
 /* The standard layout for the ring is a continuous chunk of memory which
@@ -95,10 +122,18 @@  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_packed_queue(hw)) {
+		size = num * sizeof(struct vring_desc_packed);
+		size += sizeof(struct vring_packed_desc_event);
+		size = RTE_ALIGN_CEIL(size, align);
+		size += sizeof(struct vring_packed_desc_event);
+		return size;
+	}
+
 	size = num * sizeof(struct vring_desc);
 	size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
 	size = RTE_ALIGN_CEIL(size, align);
@@ -108,10 +143,20 @@  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_packed_queue(hw)) {
+		vr->desc_packed = (struct vring_desc_packed *)p;
+		vr->driver_event = (struct vring_packed_desc_event *)(p +
+			num * sizeof(struct vring_desc_packed));
+		vr->device_event = (struct vring_packed_desc_event *)
+				RTE_ALIGN_CEIL((uintptr_t)(vr->driver_event +
+				sizeof(struct vring_packed_desc_event)), align);
+		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 26518ed98..d2a0b651a 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -245,6 +245,16 @@  struct virtio_tx_region {
 			   __attribute__((__aligned__(16)));
 };
 
+static inline void
+vring_desc_init_packed(struct vring *vr, int n)
+{
+	int i;
+	for (i = 0; i < n; i++) {
+		struct vring_desc_packed *desc = &vr->desc_packed[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)