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xen/9pfs: send responses back to the frontend

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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>
This commit is contained in:
Stefano Stabellini 2017-03-22 10:16:09 -07:00
parent 40a2389207
commit 4476e09e34
1 changed files with 19 additions and 0 deletions
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19
hw/9pfs/xen-9p-backend.c
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@ -180,6 +180,25 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
{
RING_IDX prod;
Xen9pfsDev *priv = container_of(pdu->s, Xen9pfsDev, state);
Xen9pfsRing *ring = &priv->rings[pdu->tag % priv->num_rings];
g_free(ring->sg);
ring->sg = NULL;
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 = {