similar to: [rfc] virtio-spec: introduce VIRTIO_NET_F_MULTIQUEUE

Add multiqueue support to virtio network device. Add a new feature flag VIRTIO_NET_F_MULTIQUEUE for this feature, a new configuration field max_virtqueue_pairs to detect supported number of virtqueues as well as a new command VIRTIO_NET_CTRL_STEERING to program packet steering. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> -- Changes from v2: Address Jason's comments on v2: -

Add multiqueue support to virtio network device. Add a new feature flag VIRTIO_NET_F_MULTIQUEUE for this feature, a new configuration field max_virtqueue_pairs to detect supported number of virtqueues as well as a new command VIRTIO_NET_CTRL_STEERING to program packet steering. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> -- Changes from v2: Address Jason's comments on v2: -

At Jason's request, I am trying to help finalize the spec for the new multiqueue feature. Changes from Jason's rfc: - reserved vq 3: this makes all rx vqs even and tx vqs odd, which looks nicer to me. - documented packet steering, added a generalized steering programming command. Current modes are single queue and host driven multiqueue, but I envision support for guest driven

At Jason's request, I am trying to help finalize the spec for the new multiqueue feature. Changes from Jason's rfc: - reserved vq 3: this makes all rx vqs even and tx vqs odd, which looks nicer to me. - documented packet steering, added a generalized steering programming command. Current modes are single queue and host driven multiqueue, but I envision support for guest driven

Add multiqueue support to virtio network device. Add a new feature flag VIRTIO_NET_F_MULTIQUEUE for this feature, a +new configuration field max_virtqueue_pairs to detect supported number +of virtqueues as well as a new command VIRTIO_NET_CTRL_STEERING to +program packet steering. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Changes from v3: Address Sasha's comments - drop

Add multiqueue support to virtio network device. Add a new feature flag VIRTIO_NET_F_MULTIQUEUE for this feature, a +new configuration field max_virtqueue_pairs to detect supported number +of virtqueues as well as a new command VIRTIO_NET_CTRL_STEERING to +program packet steering. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Changes from v3: Address Sasha's comments - drop

The diff below is an update to virtio-spec with specification of a stats vq added to virtio-blk. The idea behind adding a stats vq is to simplify pull of information which exists only on the guest and can't be collected on the host. The idea is basically same as the stats vq which exists in virtio-balloon and reporting host memory statistics. --- diff --git a/old/virtio-spec.lyx

The diff below is an update to virtio-spec with specification of a stats vq added to virtio-blk. The idea behind adding a stats vq is to simplify pull of information which exists only on the guest and can't be collected on the host. The idea is basically same as the stats vq which exists in virtio-balloon and reporting host memory statistics. --- diff --git a/old/virtio-spec.lyx

Each virtio scsi HBA has global request queue limits. But the passthrough LUNs (scsi-generic) come from different host HBAs may have different request queue limits. If the guest sends commands that exceed the host limits, the commands will be rejected by host HAB. To address this issue, this patch adds a per-LUN parameter query via the control queue, and defines some parameter query types. The

Each virtio scsi HBA has global request queue limits. But the passthrough LUNs (scsi-generic) come from different host HBAs may have different request queue limits. If the guest sends commands that exceed the host limits, the commands will be rejected by host HAB. To address this issue, this patch adds a per-LUN parameter query via the control queue, and defines some parameter query types. The

Hi Rusty, here is the specification for a virtio-based SCSI host (controller, HBA, you name it) so that you can apply it to the spec document and publish it. I changed the index from 7 to 8 to account for the rpmsg device, and added a feature bit to tell the guest in advance whether the host supports hotplug. Otherwise there is no change from v2. Paolo --- virtio-spec.lyx.saved 2011-11-29

Hi Rusty, here is the specification for a virtio-based SCSI host (controller, HBA, you name it) so that you can apply it to the spec document and publish it. I changed the index from 7 to 8 to account for the rpmsg device, and added a feature bit to tell the guest in advance whether the host supports hotplug. Otherwise there is no change from v2. Paolo --- virtio-spec.lyx.saved 2011-11-29

Hi all, here is the specification for a virtio-based SCSI host (controller, HBA, you name it). The virtio SCSI host is the basis of an alternative storage stack for KVM. This stack would overcome several limitations of the current solution, virtio-blk: 1) scalability limitations: virtio-blk-over-PCI puts a strong upper limit on the number of devices that can be added to a guest. Common

Hi all, here is the specification for a virtio-based SCSI host (controller, HBA, you name it). The virtio SCSI host is the basis of an alternative storage stack for KVM. This stack would overcome several limitations of the current solution, virtio-blk: 1) scalability limitations: virtio-blk-over-PCI puts a strong upper limit on the number of devices that can be added to a guest. Common

Hi all, here is the specification for a virtio-based SCSI host (controller, HBA, you name it). The virtio SCSI host is the basis of an alternative storage stack for KVM. This stack would overcome several limitations of the current solution, virtio-blk: 1) scalability limitations: virtio-blk-over-PCI puts a strong upper limit on the number of devices that can be added to a guest. Common

Hi all, here is the specification for a virtio-based SCSI host (controller, HBA, you name it). The virtio SCSI host is the basis of an alternative storage stack for KVM. This stack would overcome several limitations of the current solution, virtio-blk: 1) scalability limitations: virtio-blk-over-PCI puts a strong upper limit on the number of devices that can be added to a guest. Common

I'm working on a patchset (to follow shortly) that modified the notificatin hand-off in virtio to be basically like Xen: each side published an index, the other side only triggers an event when it crosses that index value (Xen event indexes start at 1, ours start at 0 for backward-compatiblity, but that's minor). Especially for testing, it is very convenient to have separate feature bits

I'm working on a patchset (to follow shortly) that modified the notificatin hand-off in virtio to be basically like Xen: each side published an index, the other side only triggers an event when it crosses that index value (Xen event indexes start at 1, ours start at 0 for backward-compatiblity, but that's minor). Especially for testing, it is very convenient to have separate feature bits

Add an option to modify the notificatin hand-off in virtio to be basically like Xen: each side published an index, the other side only triggers an event when it crosses that index value (Xen event indexes start at 1, ours start at 0 for backward-compatiblity, but that's minor). Since we've run out of bits in the 32 bit field, I added another 32 bit and bit 31 enables that. I started with

Add an option to modify the notificatin hand-off in virtio to be basically like Xen: each side published an index, the other side only triggers an event when it crosses that index value (Xen event indexes start at 1, ours start at 0 for backward-compatiblity, but that's minor). Since we've run out of bits in the 32 bit field, I added another 32 bit and bit 31 enables that. I started with