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    Subject[PATCH v3 09/18] xen/pvcalls: implement bind command
    Date
    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>
    CC: boris.ostrovsky@oracle.com
    CC: jgross@suse.com
    ---
    drivers/xen/pvcalls-back.c | 87 +++++++++++++++++++++++++++++++++++++++++++++-
    1 file changed, 86 insertions(+), 1 deletion(-)

    diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
    index 3eb84ef..4a0cfa3 100644
    --- a/drivers/xen/pvcalls-back.c
    +++ b/drivers/xen/pvcalls-back.c
    @@ -81,6 +81,18 @@ struct sock_mapping {
    struct pvcalls_ioworker ioworker;
    };

    +struct sockpass_mapping {
    + struct list_head list;
    + struct pvcalls_fedata *priv;
    + 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 *priv,
    @@ -261,10 +273,83 @@ 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)
    {
    - return 0;
    + struct pvcalls_fedata *priv;
    + int ret, err;
    + struct socket *sock;
    + struct sockpass_mapping *map = NULL;
    + struct xen_pvcalls_response *rsp;
    +
    + priv = 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;
    + kfree(map);
    + goto out;
    + }
    +
    + ret = sock_create(AF_INET, SOCK_STREAM, 0, &sock);
    + if (ret < 0) {
    + destroy_workqueue(map->wq);
    + kfree(map);
    + goto out;
    + }
    +
    + ret = inet_bind(sock, (struct sockaddr *)&req->u.bind.addr,
    + req->u.bind.len);
    + if (ret < 0) {
    + destroy_workqueue(map->wq);
    + kfree(map);
    + goto out;
    + }
    +
    + map->priv = priv;
    + map->sock = sock;
    + map->id = req->u.bind.id;
    +
    + down(&priv->socket_lock);
    + err = radix_tree_insert(&priv->socketpass_mappings, map->id,
    + map);
    + up(&priv->socket_lock);
    + if (err) {
    + ret = err;
    + destroy_workqueue(map->wq);
    + kfree(map);
    + goto out;
    + }
    +
    + write_lock_bh(&sock->sk->sk_callback_lock);
    + map->saved_data_ready = sock->sk->sk_data_ready;
    + sock->sk->sk_user_data = map;
    + sock->sk->sk_data_ready = pvcalls_pass_sk_data_ready;
    + write_unlock_bh(&sock->sk->sk_callback_lock);
    +
    +out:
    + rsp = RING_GET_RESPONSE(&priv->ring, priv->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 ret;
    }

    static int pvcalls_back_listen(struct xenbus_device *dev,
    --
    1.9.1
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