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Message-ID: <5ad1ca01-1e5c-7105-f303-7e8d42f6a068@redhat.com> Date: Fri, 27 Apr 2018 11:56:05 +0800 From: Jason Wang <jasowang@...hat.com> To: Tiwei Bie <tiwei.bie@...el.com>, mst@...hat.com, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Cc: wexu@...hat.com, jfreimann@...hat.com Subject: Re: [RFC v3 0/5] virtio: support packed ring 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(-) >
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