Re: [PATCH v3 15/19] vhost: postpone rings addresses translation

["Yao, Lei A" <lei.a.yao@intel.com>]

Hi, Maxime

After this commit, vhost/virtio loopback test will fail when 
use the CPU on socket 1. 
Error message like following during initialize:
VHOST_CONFIG: vring kick idx:0 file:20
VHOST_CONFIG: reallocate vq from 0 to 1 node
VHOST_CONFIG: reallocate dev from 0 to 1 node
VHOST_CONFIG: (0) failed to find avail ring address.
VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK
VHOST_CONFIG: vring kick idx:1 file:21
VHOST_CONFIG: reallocate vq from 0 to 1 node
VHOST_CONFIG: (0) failed to find avail ring address.

But if use CPU on socket 0. It still can work. Could you have a check on 
this? Thanks a lot!

Following is my cmd:
Vhost: testpmd -n 4 -c 0x3000000 --socket-mem 1024,1024 --file-prefix=vhost \
                --vdev 'net_vhost0,iface=vhost-net,queues=1,client=0' -- -i
Virtio-user: testpmd -n 4 -c 0xc00000 --socket-mem 1024,1024 --no-pci --file-prefix=virtio \
                       --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=./vhost-net \
                        -- -i --txqflags=0xf01 --disable-hw-vlan-filter

BRs
Lei 

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Maxime Coquelin
> Sent: Thursday, October 5, 2017 4:36 PM
> To: dev@dpdk.org; Horton, Remy <remy.horton@intel.com>; Bie, Tiwei
> <tiwei.bie@intel.com>; yliu@fridaylinux.org
> Cc: mst@redhat.com; jfreiman@redhat.com; vkaplans@redhat.com;
> jasowang@redhat.com; Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [dpdk-dev] [PATCH v3 15/19] vhost: postpone rings addresses
> translation
> 
> This patch postpones rings addresses translations and checks, as
> addresses sent by the master shuld not be interpreted as long as
> ring is not started and enabled[0].
> 
> When protocol features aren't negotiated, the ring is started in
> enabled state, so the addresses translations are postponed to
> vhost_user_set_vring_kick().
> Otherwise, it is postponed to when ring is enabled, in
> vhost_user_set_vring_enable().
> 
> [0]: http://lists.nongnu.org/archive/html/qemu-devel/2017-
> 05/msg04355.html
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  lib/librte_vhost/vhost.h      |  1 +
>  lib/librte_vhost/vhost_user.c | 69
> ++++++++++++++++++++++++++++++++++---------
>  2 files changed, 56 insertions(+), 14 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
> index 79351c66f..903da5db5 100644
> --- a/lib/librte_vhost/vhost.h
> +++ b/lib/librte_vhost/vhost.h
> @@ -125,6 +125,7 @@ struct vhost_virtqueue {
> 
>  	struct vring_used_elem  *shadow_used_ring;
>  	uint16_t                shadow_used_idx;
> +	struct vhost_vring_addr ring_addrs;
> 
>  	struct batch_copy_elem	*batch_copy_elems;
>  	uint16_t		batch_copy_nb_elems;
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index f495dd36e..319867c65 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -356,6 +356,7 @@ static int
>  vhost_user_set_vring_addr(struct virtio_net *dev, VhostUserMsg *msg)
>  {
>  	struct vhost_virtqueue *vq;
> +	struct vhost_vring_addr *addr = &msg->payload.addr;
> 
>  	if (dev->mem == NULL)
>  		return -1;
> @@ -363,35 +364,50 @@ vhost_user_set_vring_addr(struct virtio_net *dev,
> VhostUserMsg *msg)
>  	/* addr->index refers to the queue index. The txq 1, rxq is 0. */
>  	vq = dev->virtqueue[msg->payload.addr.index];
> 
> +	/*
> +	 * Rings addresses should not be interpreted as long as the ring is not
> +	 * started and enabled
> +	 */
> +	memcpy(&vq->ring_addrs, addr, sizeof(*addr));
> +
> +	return 0;
> +}
> +
> +static struct virtio_net *translate_ring_addresses(struct virtio_net *dev,
> +		int vq_index)
> +{
> +	struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
> +	struct vhost_vring_addr *addr = &vq->ring_addrs;
> +
>  	/* The addresses are converted from QEMU virtual to Vhost virtual.
> */
>  	vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
> -			msg->payload.addr.desc_user_addr);
> +			addr->desc_user_addr);
>  	if (vq->desc == 0) {
>  		RTE_LOG(ERR, VHOST_CONFIG,
>  			"(%d) failed to find desc ring address.\n",
>  			dev->vid);
> -		return -1;
> +		return NULL;
>  	}
> 
> -	dev = numa_realloc(dev, msg->payload.addr.index);
> -	vq = dev->virtqueue[msg->payload.addr.index];
> +	dev = numa_realloc(dev, vq_index);
> +	vq = dev->virtqueue[vq_index];
> 
>  	vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
> -			msg->payload.addr.avail_user_addr);
> +			addr->avail_user_addr);
>  	if (vq->avail == 0) {
>  		RTE_LOG(ERR, VHOST_CONFIG,
>  			"(%d) failed to find avail ring address.\n",
>  			dev->vid);
> -		return -1;
> +		return NULL;
>  	}
> 
>  	vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
> -			msg->payload.addr.used_user_addr);
> +			addr->used_user_addr);
>  	if (vq->used == 0) {
>  		RTE_LOG(ERR, VHOST_CONFIG,
>  			"(%d) failed to find used ring address.\n",
>  			dev->vid);
> -		return -1;
> +		return NULL;
>  	}
> 
>  	if (vq->last_used_idx != vq->used->idx) {
> @@ -403,7 +419,7 @@ vhost_user_set_vring_addr(struct virtio_net *dev,
> VhostUserMsg *msg)
>  		vq->last_avail_idx = vq->used->idx;
>  	}
> 
> -	vq->log_guest_addr = msg->payload.addr.log_guest_addr;
> +	vq->log_guest_addr = addr->log_guest_addr;
> 
>  	LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
>  			dev->vid, vq->desc);
> @@ -414,7 +430,7 @@ vhost_user_set_vring_addr(struct virtio_net *dev,
> VhostUserMsg *msg)
>  	LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
>  			dev->vid, vq->log_guest_addr);
> 
> -	return 0;
> +	return dev;
>  }
> 
>  /*
> @@ -685,10 +701,11 @@ vhost_user_set_vring_call(struct virtio_net *dev,
> struct VhostUserMsg *pmsg)
>  }
> 
>  static void
> -vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg
> *pmsg)
> +vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg
> *pmsg)
>  {
>  	struct vhost_vring_file file;
>  	struct vhost_virtqueue *vq;
> +	struct virtio_net *dev = *pdev;
> 
>  	file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
>  	if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
> @@ -698,6 +715,16 @@ vhost_user_set_vring_kick(struct virtio_net *dev,
> struct VhostUserMsg *pmsg)
>  	RTE_LOG(INFO, VHOST_CONFIG,
>  		"vring kick idx:%d file:%d\n", file.index, file.fd);
> 
> +	/*
> +	 * Interpret ring addresses only when ring is started and enabled.
> +	 * This is now if protocol features aren't supported.
> +	 */
> +	if (!(dev->features & (1ULL <<
> VHOST_USER_F_PROTOCOL_FEATURES))) {
> +		*pdev = dev = translate_ring_addresses(dev, file.index);
> +		if (!dev)
> +			return;
> +	}
> +
>  	vq = dev->virtqueue[file.index];
> 
>  	/*
> @@ -778,15 +805,29 @@ vhost_user_get_vring_base(struct virtio_net *dev,
>   * enable the virtio queue pair.
>   */
>  static int
> -vhost_user_set_vring_enable(struct virtio_net *dev,
> +vhost_user_set_vring_enable(struct virtio_net **pdev,
>  			    VhostUserMsg *msg)
>  {
> +	struct virtio_net *dev = *pdev;
>  	int enable = (int)msg->payload.state.num;
> 
>  	RTE_LOG(INFO, VHOST_CONFIG,
>  		"set queue enable: %d to qp idx: %d\n",
>  		enable, msg->payload.state.index);
> 
> +	/*
> +	 * Interpret ring addresses only when ring is started and enabled.
> +	 * This is now if protocol features are supported.
> +	 */
> +	if (enable && (dev->features &
> +				(1ULL <<
> VHOST_USER_F_PROTOCOL_FEATURES))) {
> +		dev = translate_ring_addresses(dev, msg-
> >payload.state.index);
> +		if (!dev)
> +			return -1;
> +
> +		*pdev = dev;
> +	}
> +
>  	if (dev->notify_ops->vring_state_changed)
>  		dev->notify_ops->vring_state_changed(dev->vid,
>  				msg->payload.state.index, enable);
> @@ -1155,7 +1196,7 @@ vhost_user_msg_handler(int vid, int fd)
>  		break;
> 
>  	case VHOST_USER_SET_VRING_KICK:
> -		vhost_user_set_vring_kick(dev, &msg);
> +		vhost_user_set_vring_kick(&dev, &msg);
>  		break;
>  	case VHOST_USER_SET_VRING_CALL:
>  		vhost_user_set_vring_call(dev, &msg);
> @@ -1174,7 +1215,7 @@ vhost_user_msg_handler(int vid, int fd)
>  		break;
> 
>  	case VHOST_USER_SET_VRING_ENABLE:
> -		vhost_user_set_vring_enable(dev, &msg);
> +		vhost_user_set_vring_enable(&dev, &msg);
>  		break;
>  	case VHOST_USER_SEND_RARP:
>  		vhost_user_send_rarp(dev, &msg);
> --
> 2.13.6