search for: descriptor

On 2017?09?10? 13:06, Michael S. Tsirkin wrote: > This is an update from v2 version. > Changes: > - update event suppression mechanism > - add wrap counter: DESC_WRAP flag in addition to > DESC_DRIVER flag used for validity so device does not have to > write out all used descriptors. Do we have benchmark result to show the advantage of DESC_DRIVER over e.g avail/used index? > - more options especially helpful for hardware implementations > - in-order processing option due to popular demand > - list of TODO items to consider as a follow-up, only two are > ope...

This is an update from v1 version. Changes: - update event suppression mechanism - separate options for indirect and direct s/g - lots of new features --- Performance analysis of this is in my kvm forum 2016 presentation. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with unique index values and DESC_HW set in flags. Host overwrites used descriptors with correct len, index, and DESC_HW clear. Flags are always set/cleared last. #...

This is an update from v1 version. Changes: - update event suppression mechanism - separate options for indirect and direct s/g - lots of new features --- Performance analysis of this is in my kvm forum 2016 presentation. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with unique index values and DESC_HW set in flags. Host overwrites used descriptors with correct len, index, and DESC_HW clear. Flags are always set/cleared last. #...

Greetings all, Anyone done any work on these products? I have several (a couple of different models) that are rebranded Ultra in the US. Using explore with usbhid returns some significant quantities of data and I've done some captures with usbsnoop. I've also asked Ultra to get me the HID definition that was used for them, in the hopes I don't have to usbsniff all the setting

...tio-dev at lists.oasis-open.org] On > Behalf Of Michael S. Tsirkin > Sent: Sunday, September 10, 2017 1:06 PM > To: virtio-dev at lists.oasis-open.org > Cc: virtualization at lists.linux-foundation.org > Subject: [virtio-dev] packed ring layout proposal v3 > [...] > * Batching descriptors: > > virtio 1.0 allows passing a batch of descriptors in both directions, by incrementing > the used/avail index by values > 1. > At the moment only batching of used descriptors is used. > > We can support this by chaining a list of device descriptors through > VRING_DESC...

...ct 01, 2017 at 04:08:29AM +0000, Michael S. Tsirkin wrote: >On Thu, Sep 28, 2017 at 09:44:35AM +0000, Liang, Cunming wrote: >> >> Get it now. Please correct me if I missing something. >> >> >> Flags status hints, >> >> - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use >> >> - DESC_DRIVER | DESC_WRAP: driver has prepared an available descriptor, device hasn't used it yet >> >> - None: device has used the descriptor, and write descriptor out >> >> - DESC_WRAP only: shall not happen,...

...ct 01, 2017 at 04:08:29AM +0000, Michael S. Tsirkin wrote: >On Thu, Sep 28, 2017 at 09:44:35AM +0000, Liang, Cunming wrote: >> >> Get it now. Please correct me if I missing something. >> >> >> Flags status hints, >> >> - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use >> >> - DESC_DRIVER | DESC_WRAP: driver has prepared an available descriptor, device hasn't used it yet >> >> - None: device has used the descriptor, and write descriptor out >> >> - DESC_WRAP only: shall not happen,...

...s/dev/2018-January/089417.html > > > > Minor changes are needed for the vhost code, e.g. to kick the guest. > > > > > > > > TODO: > > > > - Refinements and bug fixes; > > > > - Split into small patches; > > > > - Test indirect descriptor support; > > > > - Test/fix event suppression support; > > > > - Test devices other than net; > > > > > > > > RFC v1 -> RFC v2: > > > > - Add indirect descriptor support - compile test only; > > > > - Add event suppression...

...s/dev/2018-January/089417.html > > > > Minor changes are needed for the vhost code, e.g. to kick the guest. > > > > > > > > TODO: > > > > - Refinements and bug fixes; > > > > - Split into small patches; > > > > - Test indirect descriptor support; > > > > - Test/fix event suppression support; > > > > - Test devices other than net; > > > > > > > > RFC v1 -> RFC v2: > > > > - Add indirect descriptor support - compile test only; > > > > - Add event suppression...

...> This is an update from v1 version. > Changes: > - update event suppression mechanism > - separate options for indirect and direct s/g > - lots of new features > > --- > > Performance analysis of this is in my kvm forum 2016 presentation. > The idea is to have a r/w descriptor in a ring structure, > replacing the used and available ring, index and descriptor > buffer. > > * Descriptor ring: > > Guest adds descriptors with unique index values and DESC_HW set in flags. > Host overwrites used descriptors with correct len, index, and DESC_HW > clear...

...Minor changes are needed for the vhost code, e.g. to kick the guest. > > > > > > > > > > > > TODO: > > > > > > - Refinements and bug fixes; > > > > > > - Split into small patches; > > > > > > - Test indirect descriptor support; > > > > > > - Test/fix event suppression support; > > > > > > - Test devices other than net; > > > > > > > > > > > > RFC v1 -> RFC v2: > > > > > > - Add indirect descriptor support - compile test...

...Minor changes are needed for the vhost code, e.g. to kick the guest. > > > > > > > > > > > > TODO: > > > > > > - Refinements and bug fixes; > > > > > > - Split into small patches; > > > > > > - Test indirect descriptor support; > > > > > > - Test/fix event suppression support; > > > > > > - Test devices other than net; > > > > > > > > > > > > RFC v1 -> RFC v2: > > > > > > - Add indirect descriptor support - compile test...

..., 2017 at 09:44:35AM +0000, Liang, Cunming wrote: > > > > > > > > Get it now. Please correct me if I missing something. > > > > > > > > > > > > Flags status hints, > > > > > > > > - DESC_DRIVER only: driver owns the descriptor w/o available info > > > > ready for device to use > > > > > > > > - DESC_DRIVER | DESC_WRAP: driver has prepared an available > > > > descriptor, device hasn't used it yet > > > > > > > > - None: device has used the descri...

..., 2017 at 09:44:35AM +0000, Liang, Cunming wrote: > > > > > > > > Get it now. Please correct me if I missing something. > > > > > > > > > > > > Flags status hints, > > > > > > > > - DESC_DRIVER only: driver owns the descriptor w/o available info > > > > ready for device to use > > > > > > > > - DESC_DRIVER | DESC_WRAP: driver has prepared an available > > > > descriptor, device hasn't used it yet > > > > > > > > - None: device has used the descri...

Get it now. Please correct me if I missing something. Flags status hints, - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use - DESC_DRIVER | DESC_WRAP: driver has prepared an available descriptor, device hasn't used it yet - None: device has used the descriptor, and write descriptor out - DESC_WRAP only: shall not happen, device make sure to clear it Polling behavior is...

Get it now. Please correct me if I missing something. Flags status hints, - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use - DESC_DRIVER | DESC_WRAP: driver has prepared an available descriptor, device hasn't used it yet - None: device has used the descriptor, and write descriptor out - DESC_WRAP only: shall not happen, device make sure to clear it Polling behavior is...

...] > > On Behalf Of Michael S. Tsirkin > > Sent: Sunday, September 10, 2017 1:06 PM > > To: virtio-dev at lists.oasis-open.org > > Cc: virtualization at lists.linux-foundation.org > > Subject: [virtio-dev] packed ring layout proposal v3 > > > [...] > > * Descriptor ring: > > > > Driver writes descriptors with unique index values and DESC_DRIVER set in > > flags. > > Descriptors are written in a ring order: from start to end of ring, wrapping > > around to the beginning. > > Device writes used descriptors with correct len,...

...] > > On Behalf Of Michael S. Tsirkin > > Sent: Sunday, September 10, 2017 1:06 PM > > To: virtio-dev at lists.oasis-open.org > > Cc: virtualization at lists.linux-foundation.org > > Subject: [virtio-dev] packed ring layout proposal v3 > > > [...] > > * Descriptor ring: > > > > Driver writes descriptors with unique index values and DESC_DRIVER set in > > flags. > > Descriptors are written in a ring order: from start to end of ring, wrapping > > around to the beginning. > > Device writes used descriptors with correct len,...

...to head/tail layout. > > To start this discission I'm going to reply to this email reposting a > copy of the simplified virtio layout that might be appropriate for > af_packet as well. Here's the repost (slightly cut down) sorry about the duplicates. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with unique index values and DESC_HW set in flags. Host overwrites used descriptors with correct len, index, and DESC_HW clear. Flags are always set/cleared last. #...

...to head/tail layout. > > To start this discission I'm going to reply to this email reposting a > copy of the simplified virtio layout that might be appropriate for > af_packet as well. Here's the repost (slightly cut down) sorry about the duplicates. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with unique index values and DESC_HW set in flags. Host overwrites used descriptors with correct len, index, and DESC_HW clear. Flags are always set/cleared last. #...