[v12,01/10] net/virtio: vring init for packed queues

  Add and initialize descriptor data structures.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 36 +++++++++++-------
 drivers/net/virtio/virtio_pci.h    |  7 ++++
 drivers/net/virtio/virtio_ring.h   | 60 ++++++++++++++++++++++++++----
 drivers/net/virtio/virtqueue.h     | 19 +++++++++-
 4 files changed, 100 insertions(+), 22 deletions(-)
  

On 12/13/18 1:34 PM, Jens Freimann wrote:
> Add and initialize descriptor data structures.
> 
> Signed-off-by: Jens Freimann <jfreimann@redhat.com>
> Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
> ---
>   drivers/net/virtio/virtio_ethdev.c | 36 +++++++++++-------
>   drivers/net/virtio/virtio_pci.h    |  7 ++++
>   drivers/net/virtio/virtio_ring.h   | 60 ++++++++++++++++++++++++++----
>   drivers/net/virtio/virtqueue.h     | 19 +++++++++-
>   4 files changed, 100 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> index cb2b2e0bf..b1232df59 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -299,24 +299,26 @@ 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);
> +

Please remove the trailing new line.

>   	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);
> -
> -	/*
> -	 * Disable device(host) interrupting guest
> -	 */
> -	virtqueue_disable_intr(vq);
> +	if (vtpci_packed_queue(vq->hw)) {
> +		vring_init_packed(&vq->ring_packed, ring_mem, VIRTIO_PCI_VRING_ALIGN, size);
> +		vring_desc_init_packed(vq, size);
> +		virtqueue_disable_intr_packed(vq);
> +	} else {
> +		vring_init_split(vr, ring_mem, VIRTIO_PCI_VRING_ALIGN, size);
> +		vring_desc_init_split(vr->desc, size);
> +		/*
> +		 * Disable device(host) interrupting guest
> +		 */
> +		virtqueue_disable_intr(vq);
> +	}
>   }
>   
>   static int
> @@ -384,11 +386,16 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
>   	vq->hw = hw;
>   	vq->vq_queue_index = vtpci_queue_idx;
>   	vq->vq_nentries = vq_size;
> +	vq->event_flags_shadow = 0;
> +	if (vtpci_packed_queue(hw)) {
> +		vq->avail_wrap_counter = 1;
> +		vq->used_wrap_counter = 1;
> +	}
>   
>   	/*
>   	 * 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);
> @@ -491,7 +498,7 @@ 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
> @@ -1908,7 +1915,8 @@ virtio_dev_configure(struct rte_eth_dev *dev)
>   
>   	if (vtpci_with_feature(hw, VIRTIO_F_IN_ORDER)) {
>   		hw->use_inorder_tx = 1;
> -		if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
> +		if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF) &&
> +		    !vtpci_packed_queue(hw)) {
>   			hw->use_inorder_rx = 1;
>   			hw->use_simple_rx = 0;
>   		} else {
> diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
> index e961a58ca..b22b62dad 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..e155eb17d 100644
> --- a/drivers/net/virtio/virtio_ring.h
> +++ b/drivers/net/virtio/virtio_ring.h
> @@ -54,9 +54,35 @@ 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_packed_desc {
> +	uint64_t addr;
> +	uint32_t len;
> +	uint16_t id;
> +	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_packed {
> +	unsigned int num;
> +	struct vring_packed_desc *desc_packed;
> +	struct vring_packed_desc_event *driver_event;
> +	struct vring_packed_desc_event *device_event;
> +
> +};
> +


Shouldn't all the above be in the patch declaring all packed ring
related defines & structs?

>   struct vring {
>   	unsigned int num;
> -	struct vring_desc  *desc;
> +	struct vring_desc *desc;
>   	struct vring_avail *avail;
>   	struct vring_used  *used;
>   };
> @@ -95,10 +121,18 @@ 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_packed_desc);
> +		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);
> @@ -106,17 +140,29 @@ vring_size(unsigned int num, unsigned long align)
>   		(num * sizeof(struct vring_used_elem));
>   	return size;
>   }
> -
>   static inline void
> -vring_init(struct vring *vr, unsigned int num, uint8_t *p,
> -	unsigned long align)
> +vring_init_split(struct vring *vr, uint8_t *p, unsigned long align,
> +		 unsigned int num)
>   {
>   	vr->num = num;
>   	vr->desc = (struct vring_desc *) p;
>   	vr->avail = (struct vring_avail *) (p +
> -		num * sizeof(struct vring_desc));
> +			vr->num * sizeof(struct vring_desc));
>   	vr->used = (void *)
> -		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
> +		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[vr->num]), align);
> +}
> +
> +static inline void
> +vring_init_packed(struct vring_packed *vr, uint8_t *p, unsigned long align,
> +		 unsigned int num)
> +{
> +	vr->num = num;
> +	vr->desc_packed = (struct vring_packed_desc *)p;
> +	vr->driver_event = (struct vring_packed_desc_event *)(p +
> +			vr->num * sizeof(struct vring_packed_desc));
> +	vr->device_event = (struct vring_packed_desc_event *)
> +		RTE_ALIGN_CEIL((uintptr_t)(vr->driver_event +
> +				sizeof(struct vring_packed_desc_event)), align);
>   }
>   
>   /*
> diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
> index 26518ed98..1401a9844 100644
> --- a/drivers/net/virtio/virtqueue.h
> +++ b/drivers/net/virtio/virtqueue.h
> @@ -161,11 +161,16 @@ struct virtio_pmd_ctrl {
>   struct vq_desc_extra {
>   	void *cookie;
>   	uint16_t ndescs;
> +	uint16_t next;
>   };
>   
>   struct virtqueue {
>   	struct virtio_hw  *hw; /**< virtio_hw structure pointer. */
>   	struct vring vq_ring;  /**< vring keeping desc, used and avail */
> +	struct vring_packed ring_packed;  /**< vring keeping desc, used and avail */
> +	bool avail_wrap_counter;
> +	bool used_wrap_counter;
> +
>   	/**
>   	 * Last consumed descriptor in the used table,
>   	 * trails vq_ring.used->idx.
> @@ -245,9 +250,21 @@ struct virtio_tx_region {
>   			   __attribute__((__aligned__(16)));
>   };
>   
> +static inline void
> +vring_desc_init_packed(struct virtqueue *vq, int n)
> +{
> +	int i;
> +	for (i = 0; i < n - 1; i++) {
> +		vq->ring_packed.desc_packed[i].id = i;
> +		vq->vq_descx[i].next = i + 1;
> +	}
> +	vq->ring_packed.desc_packed[i].id = i;
> +	vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END;
> +}
> +
>   /* Chain all the descriptors in the ring with an END */
>   static inline void
> -vring_desc_init(struct vring_desc *dp, uint16_t n)
> +vring_desc_init_split(struct vring_desc *dp, uint16_t n)
>   {
>   	uint16_t i;
>   
>