/* * $Id: vhci_rx.c 15 2007-06-18 12:22:03Z hirofuchi $ * * Copyright (C) 2003-2007 Takahiro Hirofuchi * * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */#include "usbip_common.h"#include "vhci.h"/* get URB from transmitted urb queue */static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum){	struct vhci_priv *priv, *tmp;	struct urb *urb = NULL;	spin_lock(&vdev->priv_lock);	list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {		if (priv->seqnum == seqnum) {			urb = priv->urb;			dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", urb, priv, seqnum);			if (urb->status != -EINPROGRESS) {				 if (urb->status == -ENOENT || urb->status == -ECONNRESET) {					 uinfo("urb %p was unlinked %ssynchronuously.\n",							 urb, urb->status == -ENOENT ? "" : "a");				 } else {					 uinfo("urb %p may be in a error, status %d\n",							 urb, urb->status);				 }			}			list_del(&priv->list);			kfree(priv);			urb->hcpriv = NULL;			break;		}	}	spin_unlock(&vdev->priv_lock);	return urb;}static void vhci_recv_ret_submit(struct vhci_device *vdev, struct usbip_header *pdu){	struct usbip_device *ud = &vdev->ud;	struct urb *urb;	urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);	if (!urb) {		uerr("cannot find a urb of seqnum %u\n", pdu->base.seqnum);		uinfo("max seqnum %d\n", atomic_read(&the_controller->seqnum));		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);		return;	}	/* unpack the pdu to a urb */	usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);	/* recv transfer buffer */	if (usbip_recv_xbuff(ud, urb) < 0)		return;	/* recv iso_packet_descriptor */	if (usbip_recv_iso(ud, urb) < 0)		return;	if (dbg_flag_vhci_rx)		usbip_dump_urb(urb);	dbg_vhci_rx("now giveback urb %p\n", urb);	usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb);	dbg_vhci_rx("Leave\n");	return;}static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,		struct usbip_header *pdu){	struct vhci_unlink *unlink, *tmp;	spin_lock(&vdev->priv_lock);	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {		uinfo("unlink->seqnum %lu\n", unlink->seqnum);		if (unlink->seqnum == pdu->base.seqnum) {			dbg_vhci_rx("found pending unlink, %lu\n", unlink->seqnum);			list_del(&unlink->list);			spin_unlock(&vdev->priv_lock);			return unlink;		}	}	spin_unlock(&vdev->priv_lock);	return NULL;}static void vhci_recv_ret_unlink(struct vhci_device *vdev, struct usbip_header *pdu){	struct vhci_unlink *unlink;	struct urb *urb;	usbip_dump_header(pdu);	unlink = dequeue_pending_unlink(vdev, pdu);	if (!unlink) {		uinfo("cannot find the pending unlink %u\n", pdu->base.seqnum);		return;	}	urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);	if (!urb) {		/*		 * I get the result of a unlink request. But, it seems that I		 * already received the result of its submit result and gave		 * back the URB.		 */		uinfo("the urb (seqnum %d) was already given backed\n", pdu->base.seqnum);	} else {		dbg_vhci_rx("now giveback urb %p\n", urb);		/* If unlink is succeed, status is -ECONNRESET */		urb->status = pdu->u.ret_unlink.status;		uinfo("%d\n", urb->status);		usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb);	}	kfree(unlink);	return;}/* recv a pdu */static void vhci_rx_pdu(struct usbip_device *ud){	int ret;	struct usbip_header pdu;	struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);	dbg_vhci_rx("Enter\n");	memset(&pdu, 0, sizeof(pdu));	/* 1. receive a pdu header */	ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu),0);	if (ret != sizeof(pdu)) {		uerr("receiving pdu failed! size is %d, should be %d\n",				ret, sizeof(pdu));		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);		return;	}	usbip_header_correct_endian(&pdu, 0);	if (dbg_flag_vhci_rx)		usbip_dump_header(&pdu);	switch(pdu.base.command) {		case USBIP_RET_SUBMIT:			vhci_recv_ret_submit(vdev, &pdu);			break;		case USBIP_RET_UNLINK:			vhci_recv_ret_unlink(vdev, &pdu);			break;		default:			/* NOTREACHED */			uerr("unknown pdu %u\n", pdu.base.command);			usbip_dump_header(&pdu);			usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);	}}/*-------------------------------------------------------------------------*/void vhci_rx_loop(struct usbip_task *ut){	struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);	while (1) {		if (signal_pending(current)) {			dbg_vhci_rx("signal catched!\n");			break;		}		if (usbip_event_happend(ud)) break;		vhci_rx_pdu(ud);	}}