[Qemu-devel] [PATCH v3 4/7] virtio-blk: associate request with a virtqueue

[Stefan Hajnoczi]

Multiqueue requires that each request knows to which virtqueue it
belongs.

Signed-off-by: Stefan Hajnoczi <address@hidden>
---
 hw/block/virtio-blk.c          | 20 +++++++++++---------
 include/hw/virtio/virtio-blk.h |  4 +++-
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index fa05e41..222611c 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -29,9 +29,11 @@
 #include "hw/virtio/virtio-bus.h"
 #include "hw/virtio/virtio-access.h"
 
-void virtio_blk_init_request(VirtIOBlock *s, VirtIOBlockReq *req)
+void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
+                             VirtIOBlockReq *req)
 {
     req->dev = s;
+    req->vq = vq;
     req->qiov.size = 0;
     req->in_len = 0;
     req->next = NULL;
@@ -53,11 +55,11 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, 
unsigned char status)
     trace_virtio_blk_req_complete(req, status);
 
     stb_p(&req->in->status, status);
-    virtqueue_push(s->vq, &req->elem, req->in_len);
+    virtqueue_push(req->vq, &req->elem, req->in_len);
     if (s->dataplane_started && !s->dataplane_disabled) {
-        virtio_blk_data_plane_notify(s->dataplane, s->vq);
+        virtio_blk_data_plane_notify(s->dataplane, req->vq);
     } else {
-        virtio_notify(vdev, s->vq);
+        virtio_notify(vdev, req->vq);
     }
 }
 
@@ -187,12 +189,12 @@ out:
 
 #endif
 
-static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
+static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
 {
-    VirtIOBlockReq *req = virtqueue_pop(s->vq, sizeof(VirtIOBlockReq));
+    VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
 
     if (req) {
-        virtio_blk_init_request(s, req);
+        virtio_blk_init_request(s, vq, req);
     }
     return req;
 }
@@ -583,7 +585,7 @@ void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
 
     blk_io_plug(s->blk);
 
-    while ((req = virtio_blk_get_request(s))) {
+    while ((req = virtio_blk_get_request(s, vq))) {
         virtio_blk_handle_request(req, &mrb);
     }
 
@@ -836,7 +838,7 @@ static int virtio_blk_load_device(VirtIODevice *vdev, 
QEMUFile *f,
     while (qemu_get_sbyte(f)) {
         VirtIOBlockReq *req;
         req = qemu_get_virtqueue_element(f, sizeof(VirtIOBlockReq));
-        virtio_blk_init_request(s, req);
+        virtio_blk_init_request(s, s->vq, req);
         req->next = s->rq;
         s->rq = req;
     }
diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h
index 9b03b6a..a25b344 100644
--- a/include/hw/virtio/virtio-blk.h
+++ b/include/hw/virtio/virtio-blk.h
@@ -63,6 +63,7 @@ typedef struct VirtIOBlockReq {
     VirtQueueElement elem;
     int64_t sector_num;
     VirtIOBlock *dev;
+    VirtQueue *vq;
     struct virtio_blk_inhdr *in;
     struct virtio_blk_outhdr out;
     QEMUIOVector qiov;
@@ -80,7 +81,8 @@ typedef struct MultiReqBuffer {
     bool is_write;
 } MultiReqBuffer;
 
-void virtio_blk_init_request(VirtIOBlock *s, VirtIOBlockReq *req);
+void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
+                             VirtIOBlockReq *req);
 void virtio_blk_free_request(VirtIOBlockReq *req);
 
 void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb);
-- 
2.5.5