From: Tiwei Bie <tiwei.bie@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: zhihong.wang@intel.com, jfreimann@redhat.com, dev@dpdk.org,
mst@redhat.com, jasowang@redhat.com, wexu@redhat.com
Subject: Re: [dpdk-dev] [PATCH v6 14/15] vhost: add notification for packed ring
Date: Wed, 4 Jul 2018 14:25:24 +0800 [thread overview]
Message-ID: <20180704062524.GF28826@debian> (raw)
In-Reply-To: <20180702081629.29258-15-maxime.coquelin@redhat.com>
On Mon, Jul 02, 2018 at 10:16:28AM +0200, Maxime Coquelin wrote:
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
> lib/librte_vhost/vhost.c | 73 ++++++++++++++++++++++++++++++++++++----
> lib/librte_vhost/vhost.h | 71 ++++++++++++++++++++++++++++++++++----
> lib/librte_vhost/vhost_user.c | 24 +++++++++++++
> lib/librte_vhost/virtio-packed.h | 11 ++++++
> lib/librte_vhost/virtio_net.c | 12 +++----
> 5 files changed, 172 insertions(+), 19 deletions(-)
>
> diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
> index 8538302c9..78f20c402 100644
> --- a/lib/librte_vhost/vhost.c
> +++ b/lib/librte_vhost/vhost.c
> @@ -171,6 +171,24 @@ vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
> if (!vq->desc_packed || size != req_size)
> return -1;
>
> + req_size = sizeof(struct vring_packed_desc_event);
> + size = req_size;
> + vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
> + vhost_iova_to_vva(dev,
> + vq, vq->ring_addrs.avail_user_addr,
> + &size, VHOST_ACCESS_RW);
It should be a space instead of a tab after "vq,"
Why not put "vq, vq->ring_addrs.avail_user_addr,"
and "vhost_iova_to_vva(dev," on the same line?
> + if (!vq->driver_event || size != req_size)
> + return -1;
> +
> + req_size = sizeof(struct vring_packed_desc_event);
> + size = req_size;
> + vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
> + vhost_iova_to_vva(dev,
> + vq, vq->ring_addrs.used_user_addr,
It's better to put "vhost_iova_to_vva(dev," and
"vq, vq->ring_addrs.used_user_addr," on the same line.
Currently, it looks like something as this in my editor:
¦ vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
¦ ¦ vhost_iova_to_vva(dev,
¦ ¦ ¦ ¦ ¦ vq, vq->ring_addrs.used_user_addr,
¦ ¦ ¦ ¦ ¦ &size, VHOST_ACCESS_RW);
> + &size, VHOST_ACCESS_RW);
> + if (!vq->device_event || size != req_size)
> + return -1;
> +
> return 0;
> }
>
[...]
> @@ -640,4 +647,54 @@ vhost_vring_call(struct virtio_net *dev, struct vhost_virtqueue *vq)
> }
> }
>
> +static __rte_always_inline void
> +vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
> +{
> + uint16_t old, new, off, off_wrap, wrap;
> + bool kick = false;
> +
> +
There is no need to have two blank lines.
> + /* Flush used desc update. */
Just need one space between "/*" and "Flush".
> + rte_smp_mb();
> +
> + if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
> + if (vq->driver_event->desc_event_flags !=
> + RING_EVENT_FLAGS_DISABLE)
> + kick = true;
> + goto kick;
> + }
> +
> + old = vq->signalled_used;
> + new = vq->last_used_idx;
> + vq->signalled_used = new;
> +
> + if (vq->driver_event->desc_event_flags != RING_EVENT_FLAGS_DESC) {
> + if (vq->driver_event->desc_event_flags !=
> + RING_EVENT_FLAGS_DISABLE)
> + kick = true;
> + goto kick;
> + }
> +
> + rte_smp_rmb();
> +
> + off_wrap = vq->driver_event->desc_event_off_wrap;
> + off = off_wrap & ~(1 << 15);
Maybe it's better to use: RING_EVENT_OFF_MASK
> + wrap = vq->used_wrap_counter;
> +
> + if (new < old) {
> + new += vq->size;
> + wrap ^= 1;
> + }
> +
> + if (wrap != off_wrap >> 15)
> + off += vq->size;
> +
> + if (vhost_need_event(off, new, old))
> + kick = true;
> +
> +kick:
> + if (kick)
> + eventfd_write(vq->callfd, (eventfd_t)1);
> +}
> +
> #endif /* _VHOST_NET_CDEV_H_ */
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index b2b57de57..bda515bdb 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -523,6 +523,30 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
> vq = dev->virtqueue[vq_index];
> addr = &vq->ring_addrs;
>
> + len = sizeof(struct vring_packed_desc_event);
> + vq->driver_event = (struct vring_packed_desc_event *)
> + (uintptr_t)ring_addr_to_vva(dev,
> + vq, addr->avail_user_addr, &len);
> + if (vq->driver_event == 0 ||
It's better to compare with NULL.
> + len != sizeof(struct vring_packed_desc_event)) {
> + RTE_LOG(DEBUG, VHOST_CONFIG,
> + "(%d) failed to find driver area address.\n",
> + dev->vid);
> + return dev;
> + }
> +
> + len = sizeof(struct vring_packed_desc_event);
> + vq->device_event = (struct vring_packed_desc_event *)
> + (uintptr_t)ring_addr_to_vva(dev,
> + vq, addr->used_user_addr, &len);
> + if (vq->device_event == 0 ||
It's better to compare with NULL.
> + len != sizeof(struct vring_packed_desc_event)) {
> + RTE_LOG(DEBUG, VHOST_CONFIG,
> + "(%d) failed to find device area address.\n",
> + dev->vid);
> + return dev;
> + }
> +
> return dev;
> }
>
> diff --git a/lib/librte_vhost/virtio-packed.h b/lib/librte_vhost/virtio-packed.h
> index d386cb6df..ce3b28313 100644
> --- a/lib/librte_vhost/virtio-packed.h
> +++ b/lib/librte_vhost/virtio-packed.h
Normally, we name c/h files as something like: virtio_packed.h
Besides, it'd be better to move the definitions into
vhost.h and define the types and flags for packed
ring only when e.g. VIRTIO_F_RING_PACKED not defined.
Just like how VIRTIO_F_IOMMU_PLATFORM works:
/* Declare IOMMU related bits for older kernels */
#ifndef VIRTIO_F_IOMMU_PLATFORM
#define VIRTIO_F_IOMMU_PLATFORM 33
struct vhost_iotlb_msg {
__u64 iova;
__u64 size;
__u64 uaddr;
#define VHOST_ACCESS_RO 0x1
#define VHOST_ACCESS_WO 0x2
#define VHOST_ACCESS_RW 0x3
__u8 perm;
#define VHOST_IOTLB_MISS 1
#define VHOST_IOTLB_UPDATE 2
#define VHOST_IOTLB_INVALIDATE 3
#define VHOST_IOTLB_ACCESS_FAIL 4
__u8 type;
};
#define VHOST_IOTLB_MSG 0x1
struct vhost_msg {
int type;
union {
struct vhost_iotlb_msg iotlb;
__u8 padding[64];
};
};
#endif
> @@ -19,6 +19,17 @@ struct vring_desc_packed {
> uint16_t flags;
> };
>
> +#define RING_EVENT_FLAGS_ENABLE 0x0
> +#define RING_EVENT_FLAGS_DISABLE 0x1
> +#define RING_EVENT_FLAGS_DESC 0x2
> +#define RING_EVENT_FLAGS_MASK 0xFFFC
RING_EVENT_FLAGS_MASK should be 0x3?
> +#define RING_EVENT_WRAP_MASK 0x8000
> +#define RING_EVENT_OFF_MASK 0x7FFF
It's better to define above macros as VRING_EVENT_*
> +
> +struct vring_packed_desc_event {
> + uint16_t desc_event_off_wrap;
> + uint16_t desc_event_flags;
> +};
>
[...]
next prev parent reply other threads:[~2018-07-04 6:25 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 8:16 [dpdk-dev] [PATCH v6 00/15] Vhost: add support to packed ring layout Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 01/15] vhost: add virtio packed virtqueue defines Maxime Coquelin
2018-07-04 5:37 ` Tiwei Bie
2018-07-04 16:03 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 02/15] vhost: add helpers for packed virtqueues Maxime Coquelin
2018-07-04 5:39 ` Tiwei Bie
2018-07-04 16:03 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 03/15] vhost: vring address setup for packed queues Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 04/15] vhost: clear shadow used table index at flush time Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 05/15] vhost: make indirect desc table copy desc type agnostic Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 06/15] vhost: clear batch copy index at copy time Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 07/15] vhost: extract split ring handling from Rx and Tx functions Maxime Coquelin
2018-07-04 6:51 ` Tiwei Bie
2018-07-04 21:04 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 08/15] vhost: append shadow used ring function names with split Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 09/15] vhost: add shadow used ring support for packed rings Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 10/15] vhost: create descriptor mapping function Maxime Coquelin
2018-07-04 5:56 ` Tiwei Bie
2018-07-04 16:18 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 11/15] vhost: add vector filling support for packed ring Maxime Coquelin
2018-07-04 5:53 ` Tiwei Bie
2018-07-04 16:18 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 12/15] vhost: add Rx " Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 13/15] vhost: add Tx " Maxime Coquelin
2018-07-04 5:45 ` Tiwei Bie
2018-07-04 16:09 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 14/15] vhost: add notification " Maxime Coquelin
2018-07-03 5:57 ` Jason Wang
2018-07-03 6:43 ` Maxime Coquelin
2018-07-03 6:06 ` Jason Wang
2018-07-04 16:02 ` Maxime Coquelin
2018-07-04 6:25 ` Tiwei Bie [this message]
2018-07-04 20:20 ` Maxime Coquelin
2018-07-02 8:16 ` [dpdk-dev] [PATCH v6 15/15] vhost: advertize packed ring layout support Maxime Coquelin
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