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authorStefano Stabellini <sstabellini@kernel.org>2017-07-06 11:01:06 -0700
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2017-08-31 09:45:55 -0400
commit331a63e6f8e42bf20dfa5b94d717a5ef130fcbee (patch)
tree21222f25093ffa5d39c0e07b380951e2fd5cd0d9 /drivers/xen
parent5db4d286a8ef88a04247a005df9cdd4bce3c7673 (diff)
downloadlinux-331a63e6f8e42bf20dfa5b94d717a5ef130fcbee.tar.bz2
xen/pvcalls: implement bind command
Allocate a socket. Track the allocated passive sockets with a new data structure named sockpass_mapping. It contains an unbound workqueue to schedule delayed work for the accept and poll commands. It also has a reqcopy field to be used to store a copy of a request for delayed work. Reads/writes to it are protected by a lock (the "copy_lock" spinlock). Initialize the workqueue in pvcalls_back_bind. Implement the bind command with inet_bind. The pass_sk_data_ready event handler will be added later. 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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/pvcalls-back.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index c0fc774221ca..a6b8468c1341 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -78,6 +78,18 @@ struct sock_mapping {
struct pvcalls_ioworker ioworker;
};
+struct sockpass_mapping {
+ struct list_head list;
+ struct pvcalls_fedata *fedata;
+ struct socket *sock;
+ uint64_t id;
+ struct xen_pvcalls_request reqcopy;
+ spinlock_t copy_lock;
+ struct workqueue_struct *wq;
+ struct work_struct register_work;
+ void (*saved_data_ready)(struct sock *sk);
+};
+
static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map);
static int pvcalls_back_release_active(struct xenbus_device *dev,
struct pvcalls_fedata *fedata,
@@ -268,9 +280,76 @@ static int pvcalls_back_release(struct xenbus_device *dev,
return 0;
}
+static void __pvcalls_back_accept(struct work_struct *work)
+{
+}
+
+static void pvcalls_pass_sk_data_ready(struct sock *sock)
+{
+}
+
static int pvcalls_back_bind(struct xenbus_device *dev,
struct xen_pvcalls_request *req)
{
+ struct pvcalls_fedata *fedata;
+ int ret;
+ struct sockpass_mapping *map;
+ struct xen_pvcalls_response *rsp;
+
+ fedata = dev_get_drvdata(&dev->dev);
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (map == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ INIT_WORK(&map->register_work, __pvcalls_back_accept);
+ spin_lock_init(&map->copy_lock);
+ map->wq = alloc_workqueue("pvcalls_wq", WQ_UNBOUND, 1);
+ if (!map->wq) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = sock_create(AF_INET, SOCK_STREAM, 0, &map->sock);
+ if (ret < 0)
+ goto out;
+
+ ret = inet_bind(map->sock, (struct sockaddr *)&req->u.bind.addr,
+ req->u.bind.len);
+ if (ret < 0)
+ goto out;
+
+ map->fedata = fedata;
+ map->id = req->u.bind.id;
+
+ down(&fedata->socket_lock);
+ ret = radix_tree_insert(&fedata->socketpass_mappings, map->id,
+ map);
+ up(&fedata->socket_lock);
+ if (ret)
+ goto out;
+
+ write_lock_bh(&map->sock->sk->sk_callback_lock);
+ map->saved_data_ready = map->sock->sk->sk_data_ready;
+ map->sock->sk->sk_user_data = map;
+ map->sock->sk->sk_data_ready = pvcalls_pass_sk_data_ready;
+ write_unlock_bh(&map->sock->sk->sk_callback_lock);
+
+out:
+ if (ret) {
+ if (map && map->sock)
+ sock_release(map->sock);
+ if (map && map->wq)
+ destroy_workqueue(map->wq);
+ kfree(map);
+ }
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
+ rsp->req_id = req->req_id;
+ rsp->cmd = req->cmd;
+ rsp->u.bind.id = req->u.bind.id;
+ rsp->ret = ret;
return 0;
}