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Commit 1853f11d authored by Stefano Stabellini's avatar Stefano Stabellini Committed by Boris Ostrovsky
Browse files

xen/pvcalls: implement listen command 



Send PVCALLS_LISTEN to the backend.

Signed-off-by: default avatarStefano Stabellini <stefano@aporeto.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 67ea9893

drivers/xen/pvcalls-front.c

+57 −0
Original line number Diff line number Diff line
@@ -412,6 +412,63 @@ int pvcalls_front_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 
	return 0;

}



int pvcalls_front_listen(struct socket *sock, int backlog)

{

	struct pvcalls_bedata *bedata;

	struct sock_mapping *map;

	struct xen_pvcalls_request *req;

	int notify, req_id, ret;



	pvcalls_enter();

	if (!pvcalls_front_dev) {

		pvcalls_exit();

		return -ENOTCONN;

	}

	bedata = dev_get_drvdata(&pvcalls_front_dev->dev);



	map = (struct sock_mapping *) sock->sk->sk_send_head;

	if (!map) {

		pvcalls_exit();

		return -ENOTSOCK;

	}



	if (map->passive.status != PVCALLS_STATUS_BIND) {

		pvcalls_exit();

		return -EOPNOTSUPP;

	}



	spin_lock(&bedata->socket_lock);

	ret = get_request(bedata, &req_id);

	if (ret < 0) {

		spin_unlock(&bedata->socket_lock);

		pvcalls_exit();

		return ret;

	}

	req = RING_GET_REQUEST(&bedata->ring, req_id);

	req->req_id = req_id;

	req->cmd = PVCALLS_LISTEN;

	req->u.listen.id = (uintptr_t) map;

	req->u.listen.backlog = backlog;



	bedata->ring.req_prod_pvt++;

	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&bedata->ring, notify);

	spin_unlock(&bedata->socket_lock);

	if (notify)

		notify_remote_via_irq(bedata->irq);



	wait_event(bedata->inflight_req,

		   READ_ONCE(bedata->rsp[req_id].req_id) == req_id);



	/* read req_id, then the content */

	smp_rmb();

	ret = bedata->rsp[req_id].ret;

	bedata->rsp[req_id].req_id = PVCALLS_INVALID_ID;



	map->passive.status = PVCALLS_STATUS_LISTEN;

	pvcalls_exit();

	return ret;

}



static const struct xenbus_device_id pvcalls_front_ids[] = {

	{ "pvcalls" },

	{ "" }

drivers/xen/pvcalls-front.h

+1 −0
Original line number Diff line number Diff line
@@ -9,5 +9,6 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr, 
int pvcalls_front_bind(struct socket *sock,

		       struct sockaddr *addr,

		       int addr_len);

int pvcalls_front_listen(struct socket *sock, int backlog);



#endif