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xen/pvcalls: implement release command 

Release both active and passive sockets. For active sockets, make sure
to avoid possible conflicts with the ioworker reading/writing to those
sockets concurrently. Set map->release to let the ioworker know
atomically that the socket will be released soon, then wait until the
ioworker finishes (flush_work).

Unmap indexes pages and data rings.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2017-07-06 11:01:07 -07:00 committed by Boris Ostrovsky
parent 3cf33a587d
commit a51729cb9b
1 changed files with 68 additions and 0 deletions
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68
drivers/xen/pvcalls-back.c
View File

@ -272,12 +272,80 @@ static int pvcalls_back_release_active(struct xenbus_device *dev,
struct pvcalls_fedata *fedata,
struct sock_mapping *map)
{
disable_irq(map->irq);
if (map->sock->sk != NULL) {
write_lock_bh(&map->sock->sk->sk_callback_lock);
map->sock->sk->sk_user_data = NULL;
map->sock->sk->sk_data_ready = map->saved_data_ready;
write_unlock_bh(&map->sock->sk->sk_callback_lock);
}
atomic_set(&map->release, 1);
flush_work(&map->ioworker.register_work);
xenbus_unmap_ring_vfree(dev, map->bytes);
xenbus_unmap_ring_vfree(dev, (void *)map->ring);
unbind_from_irqhandler(map->irq, map);
sock_release(map->sock);
kfree(map);
return 0;
}
static int pvcalls_back_release_passive(struct xenbus_device *dev,
struct pvcalls_fedata *fedata,
struct sockpass_mapping *mappass)
{
if (mappass->sock->sk != NULL) {
write_lock_bh(&mappass->sock->sk->sk_callback_lock);
mappass->sock->sk->sk_user_data = NULL;
mappass->sock->sk->sk_data_ready = mappass->saved_data_ready;
write_unlock_bh(&mappass->sock->sk->sk_callback_lock);
}
sock_release(mappass->sock);
flush_workqueue(mappass->wq);
destroy_workqueue(mappass->wq);
kfree(mappass);
return 0;
}
static int pvcalls_back_release(struct xenbus_device *dev,
struct xen_pvcalls_request *req)
{
struct pvcalls_fedata *fedata;
struct sock_mapping *map, *n;
struct sockpass_mapping *mappass;
int ret = 0;
struct xen_pvcalls_response *rsp;
fedata = dev_get_drvdata(&dev->dev);
down(&fedata->socket_lock);
list_for_each_entry_safe(map, n, &fedata->socket_mappings, list) {
if (map->id == req->u.release.id) {
list_del(&map->list);
up(&fedata->socket_lock);
ret = pvcalls_back_release_active(dev, fedata, map);
goto out;
}
}
mappass = radix_tree_lookup(&fedata->socketpass_mappings,
req->u.release.id);
if (mappass != NULL) {
radix_tree_delete(&fedata->socketpass_mappings, mappass->id);
up(&fedata->socket_lock);
ret = pvcalls_back_release_passive(dev, fedata, mappass);
} else
up(&fedata->socket_lock);
out:
rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
rsp->req_id = req->req_id;
rsp->u.release.id = req->u.release.id;
rsp->cmd = req->cmd;
rsp->ret = ret;
return 0;
}