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[7/8] xen/9pfs: send responses back to the frontend

Message ID 1488852768-8935-7-git-send-email-sstabellini@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Stefano Stabellini March 7, 2017, 2:12 a.m. UTC 
Once a request is completed, xen_9pfs_push_and_notify gets called. In
xen_9pfs_push_and_notify, update the indexes (data has already been
copied to the sg by the common code) and send a notification to the
frontend.

Schedule the bottom-half to check if we already have any other requests
pending.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/xen-9p-backend.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 0570e07..80a8810 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -166,6 +166,22 @@  static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
 
 static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
 {
+    RING_IDX prod;
+    struct Xen9pfsDev *priv = container_of(pdu->s, struct Xen9pfsDev, state);
+    struct Xen9pfsRing *ring = &priv->rings[pdu->tag % priv->num_rings];
+
+    ring->intf->out_cons = ring->out_cons;
+    xen_wmb();
+
+    prod = ring->intf->in_prod;
+    xen_rmb();
+    ring->intf->in_prod = prod + pdu->size;
+    xen_wmb();
+
+    ring->inprogress = false;
+    xenevtchn_notify(ring->evtchndev, ring->local_port);
+
+    qemu_bh_schedule(ring->bh);
 }
 
 static const struct V9fsTransport xen_9p_transport = {