diff options
| author | Fam Zheng <famz@redhat.com> | 2014-09-23 15:49:24 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-09-30 11:11:20 +0200 |
| commit | 91cb1c9b56064e7cba27ab310c9c4c477694589e (patch) | |
| tree | b1e5db41309b50daaa96801e0a751408e9cf651f /include | |
| parent | 244e2898b7a7735b3da114c120abe206af56a167 (diff) | |
virtio-scsi-dataplane: Code to run virtio-scsi on iothread
This implements the core part of dataplane feature of virtio-scsi.
A few fields are added in VirtIOSCSICommon to maintain the dataplane
status. These fields are managed by a new source file:
virtio-scsi-dataplane.c.
Most code in this file will run on an iothread, unless otherwise
commented as in a global mutex context, such as those functions to
start, stop and setting the iothread property.
Upon start, we set up guest/host event notifiers, in a same way as
virtio-blk does. The handlers then pop request from vring and call into
virtio-scsi.c functions to process it. So we need to make sure make all
those called functions work with iothread, too.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/virtio/virtio-scsi.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h index e886517c6d..8e1968f9e8 100644 --- a/include/hw/virtio/virtio-scsi.h +++ b/include/hw/virtio/virtio-scsi.h @@ -182,6 +182,18 @@ typedef struct VirtIOSCSI { SCSIBus bus; int resetting; bool events_dropped; + + /* Fields for dataplane below */ + AioContext *ctx; /* one iothread per virtio-scsi-pci for now */ + + /* Vring is used instead of vq in dataplane code, because of the underlying + * memory layer thread safety */ + VirtIOSCSIVring *ctrl_vring; + VirtIOSCSIVring *event_vring; + VirtIOSCSIVring **cmd_vrings; + bool dataplane_started; + bool dataplane_starting; + bool dataplane_stopping; } VirtIOSCSI; typedef struct VirtIOSCSIReq { @@ -248,4 +260,11 @@ void virtio_scsi_free_req(VirtIOSCSIReq *req); void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, uint32_t event, uint32_t reason); +void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread); +void virtio_scsi_dataplane_start(VirtIOSCSI *s); +void virtio_scsi_dataplane_stop(VirtIOSCSI *s); +void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req); +VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s, + VirtIOSCSIVring *vring); + #endif /* _QEMU_VIRTIO_SCSI_H */ |