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Commit 331a63e6 authored by Stefano Stabellini's avatar Stefano Stabellini Committed by Boris Ostrovsky
Browse files

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: default avatarStefano Stabellini <stefano@aporeto.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 5db4d286

drivers/xen/pvcalls-back.c

+79 −0
Original line number Diff line number Diff line
@@ -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;

}