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From: Jason Wang <jasowang@redhat.com>
To: Tiwei Bie <tiwei.bie@intel.com>,
mst@redhat.com, virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Cc: wexu@redhat.com, jfreimann@redhat.com
Subject: Re: [RFC v3 0/5] virtio: support packed ring
Date: Fri, 27 Apr 2018 11:56:05 +0800 [thread overview]
Message-ID: <5ad1ca01-1e5c-7105-f303-7e8d42f6a068@redhat.com> (raw)
In-Reply-To: <20180425051550.24342-1-tiwei.bie@intel.com>
On 2018年04月25日 13:15, Tiwei Bie wrote:
> Hello everyone,
>
> This RFC implements packed ring support in virtio driver.
>
> Some simple functional tests have been done with Jason's
> packed ring implementation in vhost:
>
> https://lkml.org/lkml/2018/4/23/12
>
> Both of ping and netperf worked as expected (with EVENT_IDX
> disabled). But there are below known issues:
>
> 1. Reloading the guest driver will break the Tx/Rx;
Will have a look at this issue.
> 2. Zeroing the flags when detaching a used desc will
> break the guest -> host path.
I still think zeroing flags is unnecessary or even a bug. At host, I
track last observed avail wrap counter and detect avail like (what is
suggested in the example code in the spec):
static bool desc_is_avail(struct vhost_virtqueue *vq, __virtio16 flags)
{
bool avail = flags & cpu_to_vhost16(vq, DESC_AVAIL);
return avail == vq->avail_wrap_counter;
}
So zeroing wrap can not work with this obviously.
Thanks
>
> Some simple functional tests have also been done with
> Wei's packed ring implementation in QEMU:
>
> http://lists.nongnu.org/archive/html/qemu-devel/2018-04/msg00342.html
>
> Both of ping and netperf worked as expected (with EVENT_IDX
> disabled). Reloading the guest driver also worked as expected.
>
> TODO:
> - Refinements (for code and commit log) and bug fixes;
> - Discuss/fix/test EVENT_IDX support;
> - Test devices other than net;
>
> RFC v2 -> RFC v3:
> - Split into small patches (Jason);
> - Add helper virtqueue_use_indirect() (Jason);
> - Just set id for the last descriptor of a list (Jason);
> - Calculate the prev in virtqueue_add_packed() (Jason);
> - Fix/improve desc suppression code (Jason/MST);
> - Refine the code layout for XXX_split/packed and wrappers (MST);
> - Fix the comments and API in uapi (MST);
> - Remove the BUG_ON() for indirect (Jason);
> - Some other refinements and bug fixes;
>
> RFC v1 -> RFC v2:
> - Add indirect descriptor support - compile test only;
> - Add event suppression supprt - compile test only;
> - Move vring_packed_init() out of uapi (Jason, MST);
> - Merge two loops into one in virtqueue_add_packed() (Jason);
> - Split vring_unmap_one() for packed ring and split ring (Jason);
> - Avoid using '%' operator (Jason);
> - Rename free_head -> next_avail_idx (Jason);
> - Add comments for virtio_wmb() in virtqueue_add_packed() (Jason);
> - Some other refinements and bug fixes;
>
> Thanks!
>
> Tiwei Bie (5):
> virtio: add packed ring definitions
> virtio_ring: support creating packed ring
> virtio_ring: add packed ring support
> virtio_ring: add event idx support in packed ring
> virtio_ring: enable packed ring
>
> drivers/virtio/virtio_ring.c | 1271 ++++++++++++++++++++++++++++--------
> include/linux/virtio_ring.h | 8 +-
> include/uapi/linux/virtio_config.h | 12 +-
> include/uapi/linux/virtio_ring.h | 36 +
> 4 files changed, 1049 insertions(+), 278 deletions(-)
>
next prev parent reply other threads:[~2018-04-27 3:56 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 5:15 Tiwei Bie
2018-04-25 5:15 ` [RFC v3 1/5] virtio: add packed ring definitions Tiwei Bie
2018-04-25 5:15 ` [RFC v3 2/5] virtio_ring: support creating packed ring Tiwei Bie
2018-04-25 5:15 ` [RFC v3 3/5] virtio_ring: add packed ring support Tiwei Bie
2018-05-10 7:32 ` Jason Wang
2018-05-10 7:34 ` Jason Wang
2018-05-10 8:56 ` Tiwei Bie
2018-05-10 9:49 ` Jason Wang
2018-05-10 10:50 ` Tiwei Bie
2018-04-25 5:15 ` [RFC v3 4/5] virtio_ring: add event idx support in packed ring Tiwei Bie
2018-05-02 2:51 ` Jason Wang
2018-05-02 7:28 ` Tiwei Bie
2018-05-02 13:51 ` Michael S. Tsirkin
2018-05-02 15:12 ` Tiwei Bie
2018-05-02 15:42 ` Michael S. Tsirkin
2018-05-03 1:11 ` Tiwei Bie
2018-05-03 1:44 ` Michael S. Tsirkin
2018-05-03 2:09 ` Tiwei Bie
2018-05-03 7:25 ` Jason Wang
2018-05-03 13:54 ` Tiwei Bie
2018-05-08 3:05 ` Jason Wang
2018-05-08 5:40 ` Jason Wang
2018-05-08 6:44 ` Tiwei Bie
2018-05-08 7:16 ` Jason Wang
2018-05-08 9:16 ` Tiwei Bie
2018-05-08 9:34 ` Jason Wang
2018-05-08 9:44 ` Tiwei Bie
2018-05-09 3:43 ` Jason Wang
2018-05-16 5:01 ` Jason Wang
2018-05-16 5:55 ` Tiwei Bie
2018-04-25 5:15 ` [RFC v3 5/5] virtio_ring: enable " Tiwei Bie
2018-04-27 3:56 ` Jason Wang [this message]
2018-04-27 4:18 ` [RFC v3 0/5] virtio: support " Michael S. Tsirkin
2018-04-27 6:17 ` Jason Wang
2018-04-27 9:12 ` Tiwei Bie
2018-04-28 2:45 ` Jason Wang
2018-05-02 3:49 ` Jason Wang
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